bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis and Simulation of Medium-Frequency Power Supply Based on PSCAD
Authors: Ren Jian Feng , Zhao Shu Tao , Xu Yu Tao , Jiang Dan
Published: June 2014

The work process of medium-frequency power supply is complicated .Its waveform is complex and can not be measured conveniently. Therefore,This paper focuses on the analysis of operating principles and control methods of medium-frequency power supply, to determine its basic structural units.A simulation model of medium-frequency power supply which is controlled by pulse width modulation (PWM) is built with the electromagnetic transient analysis software PSCAD. The simulation and analysis of the medium-frequency power supply circuit are performed on the basis of the model.The simulation waveform can reflect the working process of medium-frequency power supply accurately. So this paper will provide a reliable basis for further research of medium-frequency furnace.
Estimation of Significant Number of Simultaneously Failed Elements during Power System Security Calculations
Authors: Gusev Sergey Aleksandrovich
Published: June 2014

Nowadays contingency analysis being a part of a power system security calculations is a mandatory procedure for a short-term operational stage of the electrical power system (EPS). Nevertheless, there are still a lot of problems, concerning security calculations. For instance, recent studies have shown necessity to consider simultaneous failures of several power system elements during contingency analysis. This brings complexity and voluminosity of security calculations to the new level. On the one hand, analysis of all possible contingency combinations results in unreasonably high computing time. On the other hand, many contingency combinations, especially with very large number of simultaneously failed elements (SFE), have little impact on overall result of security estimation due to very low probability of such combinations. This paper presents novel mathematical algorithm allowing estimation of significant number of simultaneously failed elements (SNSFE). Proposed algorithm was tested on the 14-bus IEEE reliability test system. Results show adequate accuracy of the technique and also confirm the necessity to simulate simultaneous failures of several network elements.
The Coordinated Control Strategy for Generator-Transformer's Voltage Regulation
Authors: Zhang Yu Ze , Liu Wen Ying , Li Shu Xin , Wang Wei Zhou , Liu Fu Chao , Zheng Jing Jing
Published: June 2014

Nowadays the main electrical wiring in medium-size and large-size thermal power units is mostly unit wiring. In the quarter of small reactive power load, some generators need to work in phase-lag operation during the daytime and in phase-advancement operation at night to meet the demand of voltage quality of their plant’s high-voltage side. This operation, however, will lower the voltage of auxiliary power and do harm to system’s stability. This paper proposes a kind of coordinated control strategy for generator-transformer’s voltage regulation. In this strategy, the main transformer should be on-load tap charger and the controller regulate the generator voltage and transformation ratio simultaneously when needed, thus the voltage quality of both high-voltage side and auxiliary power side can be insured and the generator no longer work in phase-advancement operation. This control strategy can be a meaningful proposal for AVC in smart grid in the future. Simulation result shows the stability and reliability of the proposed control strategy.
Preparation and Properties of CF/CNTs/NanoG Filled Polyacrylate Electrically Conductive Pressure-Sensitive Adhesives
Authors: Ma Huan , Qi Shu Hua , Zhang Fan , He Zheng
Published: June 2014

With the ‘Synergistic Effects’ such as ‘Bridging’ and ‘Intercalating’ between fillers with different morphologies, we can get the CF/CNTs/NanoG filled polyacrylate electrically conductive adhesives (ECA). Through the study, we found that the comprehensive properties of the electrically conductive PSA reach the best when the composite fillers are made up of CF 3wt%、NanoG 5wt% and CNTs 5wt%. The conductivity of the electrically conductive PSA reaches 3.0×10-2 S/cm, the 180o peel strength is 0.38KN/m and the shear strength is 0.42MPa.
Analysis and Modeling of Droop Control in Micro-Source for Islanded Micro-Grid
Authors: Zhang Wei Lin , Xiong Jing , Gu Yu Jiong , Zhu Ping
Published: June 2014

Considering decentralization of the micro-source units and loads in the micro-grid and concentrating on generation types and models of the storage devices,droop controlstrategy is used in controller design for the distributed generation units. The generation units adopting droop control method based on the droop characteristics can facilitate load power sharing when the powers of loads vary, and can also maintain the system frequency when a unit fault occurs and the micro-grid islands. Then, the operation variations of the micro-grid are analyzed when it runs with load changes in islanding mode and runs with the load power of micro-source varied suddenly. The corresponding rules of the active power, voltage and current for each micro-source and the frequency for the micro-grid are obtained. The simulation data results show the correctness and validity of the droop control strategy.
Power System Voltage Control Using Wind Farms Based on a Doubly Fed Induction Generation (DFIG)
Authors: Messalti Sabir , Boudjlal Bilal , Azli Hichem
Published: June 2014

This paper shows the modeling and the effectiveness of wind turbine for voltage improvement of power systems. The wind turbine is based on a doubly-fed induction generator (DFIG). A field-oriented control is used to control of the power flow exchanged between the DFIG and the power system. A simplified wind turbine model based on independent control of active and reactive powers is used in this paper. The proposed methodology is tested in the single machine power system connected to a wind farms in the case of sudden voltage variations.
Double Fault Parameters Estimation of Motor Based on Four-Order Cumulate of MUSIC
Authors: Tian Wei , Wang Jing Zhi , Wang Yu Tian
Published: June 2014

In this thesis, fault characteristic frequency can not be accurately detected if they are drowned by noise. A novel method which is Multiple Signal Classification (MUSIC) based on four-order cumulate is provided to diagnose motor broken rotor bars and stator winding inter-turn short circuit. Because four-order accumulation is able to depress noise meanwhile fault information can be obtained accurately through this way presented even with small samples. Simulation results shown that the method were higher in resolution of frequency, more accurately in fault detection and less in computational complexity.
Application of Discrete Spectrum Correction Technology for Induction Motor Rotor Fault Diagnosis
Authors: Hou Xin Guo , Li Yu , Yang Zhong Lin , Bu Le Ping
Published: June 2014

The extraction method of induction motor’s fault character based on coordinate transformation could restrain the influence of fundamental component leakage by translating fundamental component into DC component. The amplitude of the fault character frequency component was inaccurate by spectrum analysis taking no account of the leakage of itself. So rotor fault diagnosis method of induction motor based on discrete spectrum correction technology is proposed. This method which did not depend on spectral function of the window function improved the traditional phase difference correction method, and the stator current signal analysis by means of an appropriate window function is performed to reduce the interference between each frequency. The proposed method could detect the existence of fault character frequency component and its frequency and amplitude. The simulation and experimental results indicated that using this method could get better precision of frequency and amplitude of the fault character frequency component.
Ceramic Nano Composites for Thermal Insulators
Authors: Jung Hae Noo Ree , Lee Yoon Kwang , Park Hyung Ho
Published: June 2014

In this research, nanopore composite had an effect on enhancing thermal property and mechanical property. The nanopore composite maintained the pore structure and enhanced mechanical property. Al2O3 xerogel was collapsed after heat treatment over 1000°C and they had weak mechanical strength because of pores. For maintenance of pore at high temperature and improvement of mechanical strength, Al2O3 whisker was hybridized. The Al2O3 whiskers in nanopore composite play the role of pillar during heat treatment. The mechanical property of Al2O3 xerogel was improved through complexation with Al2O3 whisker. The elastic modulus of nanopore composite increased 225 % from Al2O3 xerogel.
Design of CMOS Sawtooth Wave Oscillator for Switching Power Supply
Authors: Shao Zhu Lei
Published: June 2014

Based on the CMOS technology, the sawtooth wave oscillator used in switching power supply is designed. In the condition of 27 °C and 4 V power supply voltage, the oscillation frequency of sawtooth wave oscillator is 246.61 KHz. The oscillation frequency of sawtooth wave oscillator changes between 245.94 KHz and 247.89 KHz when the power supply voltage changes between 3V and 6V. The maximum deviation is ±0.52%. From the experimental results, the sawtooth wave oscillator has good linearity, the effect of temperature and power supply to the oscillation frequency of sawtooth wave oscillator is very little. The CMOS sawtooth wave oscillator is suitable for switching power supply.
Research on Single-Phase Inverter Dual Loop Control Technology with Feed-Forward Compensation
Authors: Yao Shu Jun , Luo Jun , Han Min Xiao , Song Yang Cheng Xiang
Published: June 2014

A new approach of dual closed-loop control strategy is proposed, and the internal cause of the inverter output voltage waveform distortion is analyzed in this paper. The ability to resist load disturbance is improved by load current feed-forward compensation in the approached scheme. With inner current loop improving the speed of dynamic response, nonlinear load adaptability is enhanced. Pole assignment method is used to design controller parameters, the control scheme is simulated in PSCAD/EMTDC, the nice performance of the proposed control strategy is verified by the simulation results.
A Coordinated Controlled PV Three-Ports Converter Based on Magnetic Coupling
Authors: Tao Li Wei , Chen Jing Cao , Yan Jian Hu
Published: June 2014

According to the requirements on multiport and power flow in the application of renewable energy, a novel multiport converter based on magnetic coupling is proposed in this paper. This multiple converter is capable of charging and discharging the battery while supplying the load. Theoretical method for the analysis of a three-port converter based on magnetic coupling is presented. The principle of the control loop for the converter is given that the maximum power point tracking (MPPT) is applied for the Photovoltaic (PV) part and the independent control is for the power flow part respectively. In addition, this proposed control method is also available for multiple modules. The simulation model is built by Simplorer-Matlab software and the simulated results demonstrate that this proposed converter can realize the power distribution very well. The control strategy proposed is of great isolation and low mutual interference between different ports so that the converter can reliably operate.
Inhibition of Corrosion by Dithiocarbamate in Oilfield Water Injection
Authors: Wang Zuo Hua
Published: June 2014

In this work, corrosion inhibition in steel water pipes, used in Shengli oilfieldis studied in different corrosive media by adsorption of dithiocarbamate (DTC) on the surface of the pipes. Electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) and potentiodynamic was applied to determine the effection of this dithiocarbamate. And the result shows that this dithiocarbamate has high corrosion inhibition up to 90%.
The DMT Power Line Channel Sparse Bayesian Regression Estimation Based on Communication System
Authors: Huang Yi Pei , Han Ya Jun , Chen Bao Fan
Published: June 2014

This paper introduces the power line communications channel estimation method based on sparse Bayesian regression, it is through the use of Bayesian learning framework that provides a sparse model in the presence of noise accurate channel estimation model. Improved channel estimation using the power line for the system to consider the frequency domain equalization (FREQ) transmitter and receiver, the bit error rate and comparing the two methods for generating various channel estimation techniques, and (BER) performance curves simulation the results show that the performance of the method is better than the previous method of least squares technique.
Islanding Detection for Multiple PV Grid-Connected Inverters Based on AFDPF and SMS
Authors: Shi Yu Jie , Tan Xin Yu , Liu Qin Qin , Mao Yuan Jun
Published: June 2014

Due to the perturbation between multiple PV Grid-connected power system can’t be synchronized easily, the islanding detection often lose efficacy when multiple PV Grid-connected inverters are running simultaneously. The paper show the in-depth analysis of the principle and the advantages and disadvantages of the detection method of AFDPF and SMS, a composition controller is designed aim at the non-detection zone in multiple PV Grid-connected system in the practical application. Through the software simulation, it shows that the method mentioned in the paper practically improves the effect of the islanding detection.
Monomethyl β-Methylglutarate of New Synthetic Methods
Authors: He Feng Wei , Liu Tong , Zhang Ya Qin
Published: June 2014

Malonate ethyl ester of butene in the presence of sodium hydroxide was synthesized by addition reaction of 2-methyl propane-1,1,3 tricarboxylic acid ester, by hydrolysis decarboxylation heatingβ-methyl glutaric acid. First with excess of methanol into methyl metaplasiaβ-methyl dimethyl glutarate, and then itsβ-methyl glutaric acid methylation, get high yield of monomethyl β-methylglutarate.
Detection of Systematical Errors of AMR System Complexes
Authors: Egorov Alexandr , Kochneva Elena , Pazderin Andrew
Published: June 2014

Reliability of measurements received from automatic meter reading (AMR) systems is important. This paper presents method of bad data detection. The method allows to estimate the value of systematical error of each AMR complex in case of sufficient statistical sampling.
Power Control of Photovoltaic Inverter under Unbalanced Grid Faults Considering Limits of Its Current Harmonics
Authors: Zhou Yu , Dai Zhi Yong , Wang Qiang Gang , Ye Ling , Zhou Nian Cheng
Published: June 2014

This paper studies the instantaneous output power characteristics of photovoltaic inverters and its flexible power control strategy under unbalanced grid faults. Then the optimal parameters model of the power control is established with minimum integrated fluctuation amplitude of the active and reactive power as a goal when the constraint of the output current harmonic distortion of photovoltaic inverters is taken into account. Finally, the optimal power control of photovoltaic inverters based on dead-beat current tracking is realized and the feasibility of the proposed control strategy is verified with the power system transient software PSCAD/EMTDC.
Modeling and Simulation of MMC-HVDC Energy System
Authors: Yang Guang Hao , Zhang You Bing , Yu Ji Yun , Liu Hui Yong
Published: June 2014

In order to study the steady-state performance of modular multilevel voltage source converter (MMC-HVDC), a 21-level MMC-HVDC system is modeled by PSCAD/EMTDC software. This system uses the DC voltage and active power controls, which are designed by the fundamental operation principles and mathematical models of MMC-HVDC. By analyzing the steady-state performance of MMC-HVDC, the corresponding simulation waveforms verify the correctness and validity of the simulation model.
Extreme Learning Machine for Fault Diagnosis of Rotating Machinery
Authors: Yu Rui , Xiang Rui , Yao Shi Wei
Published: June 2014

The authors present extreme learning machine (ELM) as a novel mechanism for diagnosing the faults of rotating machinery, which is reflected from the power spectrum of the vibration signals. Extreme learning machine was originally developed for the single-hidden layer feedforward neural network (SLFN) and then extended to the generalized SLFN. We obtained the fault feature table of rotating machinery by wavelet packet analysis of the power spectrum, then trained and diagnosed the fault feature table with extreme learning machine. Diagnostic results show that the extreme learning machine method achieves higher diagnostic accuracy than the probabilistic neural network (PNN) method, exhibiting superior diagnostic performance. In addition, the diagnosis of fault feature table adding noise signal indicates the extreme learning machine method provides satisfactory generalization performance.
Numerical Study of the Intake Temperature on Gasoline Engine
Authors: Han Lin Pei , Hong Wei , Su Yan , Xie Fang Xi , Xu Yun
Published: June 2014

The optimum inlet temperature for different engine conditions was calculated based on the same knock probability with full load by CFD Fire software, and then the effects of inlet air heated on combustion,pumping loss and emissions of gasoline engine were also studied. The results showed that the highest intake temperature at intake pressure 50kPa operation can be 368K without knock, and that for 100kPa condition was 322K. Heating inlet air can enhance combustion, and the maximum combustion pressure was increased by 26.8% and IMEP by 4% at the case of 368K/50kPa condition compared with inlet pressure of 40.5kPa and temperature of 298K condition consuming same fuel. Pumping loss can also be reduced by increasing intake temperature. However, emissions of NOXand CO were increased because of higher intake temperature.
Effect of Fuel Auto-Ignition Quality on Particle Size Distribution and Particulates Morphology in a Direct Injection Diesel Engine
Authors: Du Jia Kun , Sun Wan Chen , Xiao Sen Lin , Li Guo Liang , Tan Man Zhi
Published: June 2014

The effect of fuel auto-ignition quality on particle size distribution and particulates morphology were investigated for the purpose of revealing the relationship between cetane number and particles emission. Experiments were conducted on common-rail direct injection engine under steady-state operating condition. Two basic diesel-like fuels were used in this study, hydrogenation diesel and straight-run diesel. The test fuels which have various cetane number were made up of these two basic ones. The results indicate that with increasing the fuel cetane number, a significant decrease of nucleation mode particles is found. For particle number size classification, the percentage of SOF has the same trend as the number of nucleation mode particles which size below 22nm and similar result is found between the percentage of dry soot and particles above 50nm.
Multifunctional Automatic Replacement Truck Design
Authors: Zhang Rong , Hu Jun
Published: June 2014

This article from the market background and market current situation analysis, on the current market of forklift insufficiency and flaw analysis, found a multi-purpose vehicle is very suitable for the market current situation, so the multifunctional automatic change of engineering vehicle design. Then the main function are introduced, design, calculation, through modeling, error analysis and Solidworks analysis, design a reasonable multi-functional automatic replacement vehicle structure. finally introduced multi-function automatic change the character of engineering vehicles, introduce market prospect.
Lifting Force Calculation and Safty Analysis of Hydraulic Scissor Lift Platform
Authors: Sun Lei Bo , Wang Ren Ren , Li Xin Xin
Published: June 2014

Based on the structure, the hydraulic scissor lift platform can be divided into different component modules. The maximum lifting force is calculated in accordance with its structure features, and then the safty is analyzed.
Electricity Competitiveness Evaluation Research Based on Principal Component Analysis
Authors: Niu Dong Xiao , Wang Qiong , Wang Peng , Zhou Shu Yi , Liu Wei Dong , Yu Xiao Yan
Published: June 2014

This paper constructs the evaluation index system of electricity competitiveness in terminal energy consumption, evaluates the electricity competitiveness in Ningxia region from 2005 to 2011 using principal component analysis (PCA), and compares the evaluation results of PCA, the linear weighted method, the comprehensive index method and TOPSIS-grey correlation method. The compatibility degree and difference degree of each method are analyzed and calculated to verify the applicability of the PCA. The results show that PCA is the most scientific and appropriate evaluation method.
Fuzzy Comprehensive Evaluation for Pumped Storage Capacity Determination Based on Entropy Weight Method
Authors: Zhang Zhan An , Cai Xing Guo
Published: June 2014

To determine the pumped storage capacity is a comprehensive decision-making problem. This paper presents the entropy weight method to decide the weight in fuzzy comprehensive evaluation. Example analysis shows the effectiveness of the proposed methods.
Analysis on Losses of Distribution Network and Countermeasures to Reduce Losses
Authors: Wang Qian , Chen Shang Ji , Han Xiao Hui
Published: June 2014

The thesis describes the loss model of distribution network and gives the transformer loss model and line loss model, Then it proposes some loss reduction measures at the stage of planning and design as well as operation and maintenance. Finally, according to the main problems about the loss reduction measures in China, it puts forward some countermeasures to reduce line loss . Distribution network as part of the end for power configuration which is directly connected with the users of demand side. The loss of distribution network has been high because of feeder radius, complex voltage grade and a large number of devices on the network. The line loss of distribution network represents a major component of the line loss in the whole power system, the line loss of 10kv and below distribution network accounts for about 78% in it according to statistical analysis[1-2]. So, under the current energy shortage situation, there is a great economic and social significance to adopt the reasonable measures to save energy and decrease loss in distribution network.
Site Selection Optimization for Thermal Power Plant Based on Rough Set and Multi-Objective Programming
Authors: Ren Feng
Published: June 2014

The site selection optimization for thermal power plant will directly impact the economic operation and sustainable development. On the basis of constructing index system for site selection of thermal power plant, the method of rough set is applied to obtain the index weights, which are determined only by the system potential information. Through the method of expert decision-making, the quantitative and qualitative information is integrated, and the priority of the alternatives is obtained. The multi-objective model for site selection optimization is built up to balance the economical efficiency and the average comprehensive efficiency. In consideration of decision-makers predilection and heat load demand, the two goals of cost minimum and average comprehensive efficiency maximum are achieved at the same time. Case analysis indicates that the method for site selection optimization of thermal power plant proposed in this paper possesses some advantages, such as scientificity and practicability.
Application of Regression Analysis in Power System Load Forecasting
Authors: Chen Chen , Zhou Jie Na
Published: June 2014

Power system load forecasting is an important job for power system scheduling, planning and planning departments. In the long run, the accuracy of load forecasting is closely related to reasonable extension and renovation of power grid development. On the basis of collecting historical load data of a region, considering the co-integration theory and error correction, the author adopts regression analysis to predict of the load development of the region in the next five years, then finally puts forward the new way of enhance load forecasting accuracy in the future.
Discussion on Asset-Backed Securitization of PV Power Plants
Authors: Wang Yi Feng
Published: June 2014

At present, it universally exists that the financing problem confronts photovoltaic (PV) power plant construction in our country. The PV power plant construction in industry falls into the capital-intensive enterprises with the feature of long-time development, substantial investment needed but relatively fixed income. Thereby, it is greatly appropriate for solar securitization to address the financing needs of the industry with its characteristic and realize diversified financing channels. In this paper, firstly, the feasibility and necessity of ABS financing for PV industry is discussed. Then, we elaborate the current four construction modes of PV power plant, namely, transfer of beneficial interest of power charge, credit increment of financing platform company, BOT (build-operate-transfer), and financing leasing, according to which the financial institution designs the asset-backed securities supported by the beneficial interest of the power plant. Further, we analyze the main problems and challenges of carrying out the ABS business. Countermeasures and suggestion ns are put forward finally.
Economic Analysis of a 660MW Supercritical Turbine for Steam Initial Parameters
Authors: Tang Yu Lin , Tu Shan , Du Yang , Wang Chao , Wang Hong Juan
Published: June 2014

Economic diagnosis of thermal power units is to determine the economy of its operating parameters and operating modes by quantitative and qualitative analysis, which is significant to economic operation and energy saving of power plant. On the basis of equivalent enthalpy drop method and the theory of variable conditions, the economic diagnosis model of operating parameters was established. As main steam temperature and main steam pressure for example, economic diagnosis of a 660MW supercritical steam turbine unit was performed. The result demonstrates that improving the main steam temperature or main steam pressure can reduce heat consumption of the unit. The essence of improving the initial steam parameters is to improve the average temperature of the steam cycle endothermic process, thus improving the circulation efficiency and reducing heat consumption. The economic impact of main steam temperature is up to 0.61g/(kW·h), while which of main steam pressure is little. Therefore, by increasing the initial steam parameters, especially the main steam temperature, to improve the economy of the entire power plant is the main way to enhance the efficiency of power plant in the current.
Practical Analysis of State Estimation Based on Dispatching Simulation Platform
Authors: Zhang Ying , Feng Shuhai , Liu Jun
Published: June 2014

In the process of practical application of state estimation in the actual dispatching system, there are many factors that affect the accuracy of state estimation results. This paper based on the simulation platform of the dispatching system and used the operation data of the actual power grid to simulate the operation of power grid, then analyzed the various factors that have influence on the results of state estimation, which provided effective technical support for practical application of state estimation.
Design of Microgrid Energy Management System Based on LabVIEW
Authors: Ge Teng Yu , Zhang Bu Han , Wu Jun Li , Jin Bing Jie , Zhao Shuang , Zhang Kai Min
Published: June 2014

Microgrid can be applied in different locations, relative to traditional power technology. It can improve the reliability of users of electricity and power system operation. Distributed power in microgrid needs real-time and multi-objective optimization management. This paper discusses functions and structure of microgrid energy management system(MGEMS) when connected with the main grid. Problems in long-term and short-term energy management of microgrid are discussed. From the point of view of the software platform, the system structure of MGEMS software are proposed. On this basis, this paper discusses the way to construct modules of MGEMS and their functions.
Adaptability Evaluation of Conformance Control Agents in Low Permeability Reservoirs with Fractures
Authors: Zhao Feng Lan , Cao Shu Jun , Hou Ji Rui
Published: June 2014

Several conformance control agents, including preformed particle gel, emulsion microspheres, continuous chromium gel and underground starch graft copolymer gel were evaluated. The properties such as gelation time and gel strength of gel, and expansion of particles and microspheres were tested at high temperature. Also, the injection pressure, plugging strength and resistance factor were measured using the artificial low permeability cores with fractures. It was shown that, for particle type conformance control agents, the particle size should be adaptable with the fracture width. Also, for continuous chromium gel, the added polymer concentration higher, the viscosity is higher, with higher plugging strength. The plugging and strength should be coordinated. The starch graft copolymer gel is easy to be injected into formation and has good plugging property. The results show that underground starch graft gel is more suitable for conformance control in low permeability formation with fractures.
Porous Aluminum Titanate Ceramics Prepared Using Graphite as Pore Former
Authors: Zhao Gen Fa , Bai Yang , Qiao Li Jie
Published: June 2014

This paper described the properties of porous aluminum titanate (AT) ceramics. The AT samples with composition of 41 wt% Al2O3, 50 wt% TiO2, 4.5 wt% MgO and 4.5 wt% Fe2O3while 0~60 wt% graphite was used as pore former. The pore structures of the samples sintered at 1250~1350oC were analyzed by scanning electron microscopy and Hg porosimetry, while the crystal phases of the aluminum titanate were analyzed by X-ray diffraction. After sintered at, the samples have open porosities of 25~51%, depending on the graphite amount and the sintering temperature. The porosity increases and the flexural strength decreases with the increasing amount of graphite.
Study on the Process Optimization for Intermediate Magnesium Carbonate Tri-Hydrate
Authors: Wu Dan , Luo Bi Jun , Liu Wei , Wang Li Cong , Yao Ying , Huang Xi Ping
Published: June 2014

It is a kind of high efficiency and energy saving new method to prepare high purity magnesium oxide (MgO) with magnesium carbonate tri-hydrate (MgCO3·3H2O) as intermediate. Our research group had already designed orthogonal experimental and got the optimal process conditions of MgCO3·3H2O. The operating parameters such as temperature, pH and reaction time had been further optimized in this paper. Intermediate MgCO3·3H2O with high aspect ratio and good settling performance was synthesized at the optimal temperature 40-50°C,the optimal pH 8.8-9.0, the optimal reaction time70min, the optimal condition also applied to brine system.
Ir/AlO(OH)/Fe3O4: A High Active and Selective Catalyst for Hydrogenation of p-Choronitrobenzene to p-Chloroaniline
Authors: Wu Jie , Zhang Chun
Published: June 2014

Ir/AlO(OH)/Fe3O4 catalyst has been prepared and applied for the hydrogenation of p-choronitrobenzene (p-CNB) to p-chloroaniline (p-CAN) at 35 °C and balloon hydrogen pressure in ethanol/water mixture. The experiment results indicated that the catalyst Ir/AlO(OH)/Fe3O4 showed excellent catalytic properties for the hydrogenation of p-CNB to p-CAN. A complete conversion of p-CNB was achieved with a selectivity of 97.2 % to p-CAN. The catalyst was quite stable and can be recycled at least seven times without loss of any activity. Moreover, the magnetic property of the catalyst facilated the separation of the used catalyst from the reaction system without filtration.
The Comparison of Au/C Catalyst and Au-Pd/C Catalyst for the Oxidation of Glyoxal to Glyoxylic Acid by Oxygen
Authors: Wang Xiao Li , Bao Shuang Cheng , Jia Mei Lin
Published: June 2014

In this paper, Au/C and Au-Pd/C catalysts were prepared respectively. The catalytic performance for the oxidation of glyoxal to glyoxylic acid has been investigated. Furthermore, these catalysts were characterized by XRD and XPS. The results demonstrate that, the conversion of glyoxal was 58.9% and the yield of glyoxylic acid was 13.7% at the optimum reaction time of 20h, which implied the bimetallic catalyst showed higher performance than the monometallic catalyst obviously.
Electrochemical Investigation of Myclobutanil as Corrosion Inhibitor for Copper in Acid Medium
Authors: Zheng Li , Liu Ji , Tao Zhi Hua , He Wei , Xiao Ding Jun , Tan Ze
Published: June 2014

This paper is mainly to discuss that myclobutanil as corrosion inhibitor and its corrosion efficiency were evaluated via electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The potentiodynamic polarization measurements showed that the inhibition efficiency increases sharply with the increasing of concentration of myclobutanil, and the highest inhibition efficiency of the myclobutanil reached 84.3% at 3.2×10-4 mol/L in 1 mol/L HCl. The result also indicated that myclobutanil belongs to the mixed type inhibitor. The results obtained from EIS measurements are in good agreement with that obtained from potentiodynamic polarization.
Study on Plastic Strain and Plastic Strain Rate in Machining of Steel AISI 1020 Using FEM Analysis
Authors: Qin Qi , Ma Shi Zhong , Li Peng Yun , Wang Ming Wei
Published: June 2014

Based on analyzing and testing the core samples of three inspection wells, we research in-layer heterogeneity of the main types monosandbody; in order to build macroscopic analysis on the difference of physical properties in reservoir interbedded, we can also draw distribution diagram of the interbedded sandstone’s average porosity and permeability through the physical property data in the study area, meanwhile it is necessary to use statistic data of physical parameters including variation coefficient, mutation coefficient and range to draw tables，which can show the degree of heterogeneity of monosandbody in the reservoir become much stronger from top to bottom; In addition, according to the study of plane microfacies and monosandbody, the information relating to the heterogeneity of the main monosandbody can be acquired. In conclusion, it is clear to know the distribution characteristics of remaining oil deriving from FuYu oil layer in the Chao 45 Block, and the distribution area of residual potential of microfacies by reducing the heterogeneity of reservoir to improve the connectivity, and then increase the mining effect.
Pore Network Simulation of Two Phase Flow Based on X-Ray Micro Computed Tomography Images
Authors: Mutailipu Meiheriayi , Liu Yu , Chen Ling Yu , Song Yong Chen
Published: June 2014

In this paper, firstly, the X-ray micro computed tomography (micro-CT) is used for the analysis of internal structure of sand-packed beds. Binary data which are able to describe the pore structures of these beds were obtained from a series of imaging processing of rescaling, media filtering, and thresholding. Then a Maximal Ball (MB) algorithm is applied to these binary data to extract the equivalent pore networks. The parameters of the pore networks, such as radius, coordination number and shape factors of pore and throat are computed. The results demonstrate that the MB method can extract reasonable and faithful pore network of the different sand packed samples. Finally, the relative permeability and capillary pressure of drainage and imbibition cycle of water and oil are predicated. The numerical simulation results demonstrated good accordance with that of the experiments. Pore network simulation shows good results for two phase flow in porous media.
Extrusion Process and Mould Design for Contact Finger
Authors: Xin Xuan Rong , Xu Ding
Published: June 2014

Extrusion process and mould design for contact finger by stamping machine is introduced in this paper. The structural design of the die is simple and practical, the productivity is improved significantly, the material consumption is reduced accordingly , the quality of products is very good and the production cost is low.
Classification and Morphological Structure of Scale in the Process of Alumina Production High Pressure Digestion
Authors: Ma Hai Zhu , Huang Fang , Liu Shi Rong , Xu Bo , Liu Hua Long
Published: June 2014

The chemical composition, phase component and morphology characteristics of scale were researched by chemical analysis, XRD, SEM and TEM. The results show that the scale can be divided into iron minerals, silicon minerals, Ca-Ti-Mg minerals and aluminum hydroxide. Alumogoethite and micro-fine sodium-silicon slag fill in the gaps between the neat and bulky hematite crystals. Microgranular hydrated garnet and olivine fill in the gaps between the goethite crystals with a dense layered structure, accompanied by a small amount of galena and apatite precipitation particles. Perovskite and magnesium hydroxide have five periodic sedimentary cycles, forming an alternating sedimentary layer structure. Aluminum hydroxide forms thick scale and presents two kinds of typical structures, spherulitic and laminated. The research provides the theoretical basis for preventing and controlling scale in high-pressure digester group.
Numerical Study of Laminar Flow and Convection Heat Transfer of Nanofluids inside Circular Tube
Authors: Zhao Ning Bo , Li Shu Ying , Yang Jia Long , Wang Zhi Tao , Meng Hui
Published: June 2014

This paper presents a numerical study on laminar flow and convective heat transfer of nanofluids in a circular tube under constant wall heat flux boundary condition. Single phase model is used for simulating the heat transfer and flow behaviors of three different nanofluids. The effects of nanoparticle concentrations, nanoparticle diameter, nanoparticle material and Reynolds number on the Nusselt number and wall shear stress of nanofluids are determined and discussed in details. The comparison of Nusselt number of CuO-EG/water, SiO2-EG/water and Al2O3-EG/water nanofluids are presented. The results show that Nusselt number clearly increases with an increase in the nanoparticle concentration and flow Reynolds number, while the nanoparticle diameter has an opposite effect on the Nusselt number. Compared to SiO2-EG/water and Al2O3-EG/water nanofluids, CuO-EG/water nanofluids give higher Nusselt number with the same nanoparticle concentrations. The results also show that wall shear stress increases with increasing nanoparticle volume concentration.
Fast Detection of Illegal Sweeteners in Liquor and Wine by Laser Raman Spectroscopy
Authors: Fu Da You , Yuan Dong , Zhang Xiao Fang , Zhao Xin
Published: June 2014

Efficient method was proposed for the qualitative detection of 6 illegal sweeteners in commercial liquor and wine by laser Raman spectroscopy. The method was based on the comparative analysis of Raman spectrogram of pure sweeteners and alcohol samples. For the 6 kinds of sweeteners tested, saccharin sodium, acesulfame potassium impurity and cyclamate, were present as additives in the samples. The results showed that the proposed method was fast and simple with high repeatability and sensitivity, and needed little samples and cost less. Keywords: Sweeteners, Qualitative Analysis, Micro-Laser Raman, Liquor and Wine
Numerical Study on the Interaction Mechanism between Swirl and Reverse Flow Rate in a Twin Swirl Combustor
Authors: Liu Yin Li , Tang Hao
Published: June 2014

An isothermal flow in a Twin Swirl Combustor (TSC) was simulated with the Renormalized Group (RNG) k-ε turbulence model. The swirling and recirculation intensity was studied under different structures and inlet conditions. The results confirmed that there was a significant negative correlation between the trend lines of the swirl number (S) and reversed flow rate (Xr). The gradient of reversed flow rate was larger in the front and middle parts of the combustor than that of swirl number. The end-surface-inlet structure had a better swirl and recirculation enhancement effect. With the end-surface-inlet structure, the internal swirl and reverse intensity could be flexibly adjusted by switching the swirl intensity of the primary air. Under the structure of staggered-inlet, there was a critical distance between primary and secondary air inlets. When exceeded, it would be more difficult to enhance the swirl and reverse flow effect by increasing the swirl intensity of the secondary air.
Optimization Design and Analysis of Heat Pipe Internal Factors Based on the Orthogonal Test Method
Authors: Yao Shou Guang , Deng Jiang Wei , Sheng Dong , Jia Xin Wang , Lu Sheng
Published: June 2014

In order to study the influence of various factors on the heat pipe heat transfer performance, the heat transport limit was taken as test index, nine groups of heat pipe factors matching experiments were carried out based on the orthogonal test method. Four heat pipe internal factors including wick, work media, mass concentration and filling ratio were studied. The results show that the wick has the greatest influence, filling ratio ranks the second, while the work media and mass concentration are not so obviously; the wick and work filling ratio both have significant influences on test index, while work media and mass concentration have little significance.
The Utilization of Genetic Algorithm on High Temperature Superconducting Magnet Design
Authors: Song Meng , Liu Hao , Deng Xu Zhi , Zhang Yi , Ren Li , Shen Shi Feng , Hu Nan Nan
Published: June 2014

In high temperature superconducting (HTS) magnet design, it well known that the critical current (Ic) is sensitive to the direction of the local magnetic field. The perpendicular magnetic field component to the face of tape have a larger effect on the Icof a HTS tape than the parallel component. Thus in HTS magnet design, the magnetic field distribution is the first considering factor. This work presents a HTS magnet design using genetic algorithm to obtain the object. When the length of the tape is certain, the results show that the process gives the optimal number of the double pancake and the inner radius of the magnet.
Research on Recovering Waste Heat from Liquid Produced in Heavy Oil Exploitation by SAGD Technology
Authors: Xiao Zhong Zheng , Wang Shu Zhong , Yang Jian Ping
Published: June 2014

In order to enhance the economy of steam assisted gravity drainage (SAGD) technology, researches were conducted on the technology for recovering heat from liquid produced from oil wells. In this study, spiral-plate heat exchanger has been chosen after comparison and analysis, which is used to recover the heat from the produced liquid and raise the temperature of the softened water used in steam injection boilers. The procedures are liquid produced from the wellhead enters a metering and transfer station for degasification and then enters a centralized heat exchanger station where its temperature is reduced to 100°C from 170°C and the temperature of softened water used as boiler feed water is increased to 110°C from 70°C. The result shows that the fuel gas consumption will drop by 907200Nm3 for each boiler annually when the liquid heat recovery technology is adopted.
Analysis on the Calculation Methods of Acid Dew Point of Flue Gas
Authors: Zong Chen , Zhang Xiao Hui , Wang Qi Min
Published: June 2014

At present, there are lots of calculation methods of acid dew point of flue gas; formula of acid dew point in the thermal calculation from the former U.S.S.R has been widely applied in China. But this formula still has some problems, such as the desulphurization ability of different fuels, classification of sulfur content in fuel and the factors of SO2 transferred into SO3.In order to solve these problems,the formula of the acid dew point in the thermal calculation from the former U.S.S.R is adjusted. It was found that the precision of A.G.O kkes formula is the highest by comparing several formulas. So the last will be the compilation of the new formula and A.G.O kkes formula, the former Soviet union formula and the calculation of burning lean coal,bituminous coal and lignite typical instance of 600 MW,it was found that the precision of new formula calculation has improved.
Research New Waterproof Agent of the Particleboard
Authors: Yan Zhao
Published: June 2014

Modern society,with the rapid development of economy,people living standard increasing, for the plate demand continues to grow. Because the forest resources dwindling, To make full use of waste bagasse, corn straw and non wood fiber materials to produce an artificial plate material instead of wood man-made board has be imperative.Corn straw shavings can realize the recycling of waste materials, bring the economic value, so this topic with corn straw shavings as raw material, in the laboratory preparation of melamine resin adhesive, pressing flake molded sheet.Melamine plastic using M ( melamine ):U ( urea ) :F ( formaldehyde ) =1∶0.6∶2.5, adhesive solid content is 54%, the sizing, hot pressing temperature, hot pressing time as three factors orthogonal experiment, pressed sheet. On the plate thickness swelling, internal bond strength and surface plate bending strength test, on the analysis and summarization of results, the optimum process parameters: sizing quantity20%, temperature 150 °C, hot pressing time25min. The corresponding optimum mechanical properties: the absorbing water thickness expansion rate (2H ) 9.76%, inner strength, bend strength of17.49Mpa,0.45MPa. Key words: Non wood shavings; Molded sheet; Process parameters; Mechanical properties
Effects of pH on Hg0 Re-Emission in WFGD
Authors: Qiu Yong , Wu Hui , Luo Guang Qian , Yao Hong
Published: June 2014

Gaseous oxidized mercury (Hg2+) in the flue gas is soluble in water and can be captured effectively by Wet flue gas desulfurization (WFGD) system. But in some extent Hg0re-emission happens due to the reduction of absorbed Hg2+, and the pH of slurry is an important factor affecting Hg0re-emission. In this study, the theoretical formulas of slurry pH were derived through the conventional solution theory and then were used to evaluate the factors determining the pH of slurry. A series of laboratory experiments were carried out under N2,CO2and O2/N2atmosphere to measure the Hg0re-emission tendency at different pH values. The results show that the higher the pH, the less Hg2+reduced by S(IV), resulting in the decrease of Hg0re-emission. Under N2atmosphere, the Hg0re-emission was mild at pH>4 while it was dramatic at pH<4. Under O2/N2atmosphere, the addition of O2extended the time span of Hg0re-emission at low pH and increased Hg0re-emission unexpectedly in the latter part of the experiments at high pH. CO2atmosphere almost did not affect Hg0re-emission because of its little effect on the slurry pH.
The Comparison of Albumin Dialysis between Open- and Closed-Loop Dialysis Modes
Authors: Pei Ying Ying , Sun Yi Ze , Sun Si Jie , Gao Da Yong , Ding Wei Ping
Published: June 2014

The open-loop albumin dialysis mode (OLM) is usually used to remove protein-bound toxins from artificial liver support systems. However, there is still interest in closed-loop albumin dialysis mode (CLM) because this mode could enable the regeneration and reuse of albumin and minimize the physical size of liver support systems. In this paper, the two dialysis modes were theoretically compared under various theoretical conditions. Our results show that at the beginning of the dialysis period, in terms of detoxification efficiency, CLM is better. As the molar ratio of toxin to albumin in the blood (RTA) decreases, the overall performance of CLM approaches that of OLM in 4-hour dialysis. In certain cases, the clearance of albumin-bound toxins by CLM could be as effective as that by OLM; occasionally, CLM is even more effective.
Suitable for Cold Area Soil GSHP System Thermal Compensation Method Argument
Authors: Bai Li , Wang Peng Xuan
Published: June 2014

In order to study the issue of heat imbalance while the ground-source heat pump using in cold regions,this thesis adopts a technology with independent intellectual property rights which is called “thermal compensation control area partition method”.