bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamic Thermal Characteristics of a Conduction-Cooled HTS SMES System
Authors: Song Meng , Deng Xu Zhi , Cao Kun Nan , Wang Da Da , Ren Li , Tang Yue Jin
Published: August 2013

During operating, SMES system will suffer thermal load by AC losses and thermal disturbance which may cause unstable for HTS magnets. In this paper, dynamic thermal response of a conduction-cooled HTS SMES system in power exchanging and local heat disturbance condition is simulated to make comparison on cooling effect for different cooling configuration. 3-D SMES models based on heat conduction equation are established and solved with finite element methods. The results show the relationship between the cooling configuration and the transient stability of SMES system.
Optimization Research on a Nature Gas Engine Compression Ratio
Authors: Feng Guo Dong , Gao Ying , Li Jun , Qin Yan
Published: August 2013

The CNG engine in this paper is developed based on a prototype diesel engine platform. In this paper by analyzing the combustion of the CNG engine under different compression ratio with the FIRE software, we could see that the model which compression ratio is 11 could meet the load needs and the economic needs. At the same time the heat load could meet the requirements of the prototype diesel engine.
Research and Discussion on Electro-Magnetic Treatment in Circulating Cooling Water of Power Plant
Authors: Xiao Ni Zhang , Xiao Nan Zhang , Wen Long Wu , Zhao Rui Ju , Zhang Chun Lei
Published: August 2013

The effects of anti-scale, anti-corrosion and disinfection of circulating cooling water with electro-magnetic treatment and chemical treatment in the laboratory are compared. The applications of electro-magnetic treatment in power plants are summarized and discussed. The results of both experiments and applications in power plants show that the electro-magnetic treatment can be used in particular conditions, but the development of electro-magnetic treatment technology is immature. This technology used in circulating cooling water system in power plants should be further proved by more experiments and field applications.
Mechanical Stress Analysis of Different Shapes Pillars with Cnoidal Internal Wave Action
Authors: Fan Xiao Chao , Shi Rui Jing , Li Feng Ting , Wei Bo , Dang Yue
Published: August 2013

The numerical simulations of the flow around different pillars acted by the cnoidal internal waves have been made by building numerical wave flume based on FLUENT software. The cnoidal internal wave was created by using the push-pedal method, and the free surface was tracked by using VOF (volume of fluid) method. The three-dimensional different amplitude and period cnoidal internal waves were simulated. The inertia force and viscous force trends were analyzed, and for different pillars the total wave force were compared. There were some significance for stress analysis of the offshore terminal pillars. The converted wave force could alternative and treatment problems about square columns.
Numerical Simulation and Analysis of Interior Shear Stress in Centrifugal Cardio Pump
Authors: Dai Xue Bing , Xu Jian Pu , Zhang Liang
Published: August 2013

Two centrifugal cardio pumps with recirculation region and anti-recirculation region are designed by speed coefficient method. We can obtain the flow distribution of impeller and inside the shell at design conditions from geometric modeling and numerical simulation of two cardio pumps by using related software, and compared the interior shear stress distribution of two cardio pumps at the same condition. The results show that the maximum shear stress in the cardio pump with the recirculation region is lower about 10% than the pump with the anti-recirculation region and the region of the shear stress is exceed the critical shear stress (150Pa) which produced hemolytic is less about 2/3 than the cardio pump with the anti-recirculation region from the shear stress distribution. As a result a tiny destroys are caused to the blood cell and the pump with the anti-recirculation region model correspond with the demand of the haemophysiology, the research results provide the theory reference and basis in the optimization design for such artificial cardio pump.
Wicket Gate Closure Control Law to Improve the Transient of a Water Turbine
Authors: Li Xiao Qin , Chang Jin Shi , Chen Peng
Published: August 2013

The increase in speed and system hydraulic pressure may cause major accidents during the transient of load rejection, especially in high-water head hydropower plants. The current study presents a wicket gate step-by-step closure control law, where two guide vanes will be closed asynchronously to reduce the increase in pressure and improve the transient quality of a waterturbine. Compared with the calculated data in the routine closure law, the control law obviously improved the dynamic qualities of the transient in load rejection and decreased the rising hydraulic pressure from the water diversion system of the plant. The proposed control law can replace the role of a surge tank under certain conditions.
Experiment Study on Improved Closed Loop Pulsating Heat Pipe with Silver/Water Nanofluid
Authors: Shi Wei Xiu , Li Wei Yi , Pan Li Sheng
Published: August 2013

Start up and heat transfer performances of improved closed loop pulsating heat pipe (ICLPHP) charged with water and silver/water nanofluid, respectively, were investigated experimentally with angles of 90° and 60°. Both the average evaporator wall temperature and the overall thermal resistance of the ICLPHP with different working fluids and at the volume filling ratio of 35% were tested and compared. Experimental results showed that nanofluid caused different thermal performances of ICLPHP. Within the experiment range, silver/water nanofluid can improve operation stability and heat transfer limit and reduce starting power compared with water. With high heating power, thermal resistance of nanofluid was lower than that of water. With inclination of 60°, ICLPHP with nanofluid operated better and reduced sensitivity of inclination.
New Technologies of Pressure Pre-Cooling Flow Field Uniformity
Authors: Niu Jian Hui , Tian Hai Chuan , Qin Jun Ru
Published: August 2013

Flow field uniformity in the process of pressure pre-cooling can ensure fruit and vegetable pre-cooling effect. Flow field of pre-cooling packing boxes under 5 different opening modes were calculated through numerical simulation, including velocity distribution, temperature distribution and pressure distribution. The simulation results were also verified by experiment. Both theoretical and experimental results showed that the greater the external covering opening ratio, the faster the cooling. Temperature of the measure points away from the pressure fan side with a small opening ratio reduced more rapidly than that with a big external opening ratio. The opening ratio of the external covering should be lower close to pressure fan side than that away from it. Therefore in actual pre-cooling work, the opening ratio close to pressure fan side should be lower than that away from it. The diameter of the openings distributed at the lower part should be smaller than that of the openings distributed at the upper part of the external covering and this can overcome pre-cooling non-uniformity between upper and lower layers.
Study on Energy Consumption Analysis Method of Distributed Cryogenic Separation System
Authors: Wang Zhi Guo , Zhang Lei , Yin Chai Ling
Published: August 2013

Cryogenic separation method is the main method to recycle NGL (Natural Gas Liquid). Oilfield two-stage expansion NGL cryogenic separation plant is a complex system composed of varieties of material flow, energy flow and equipments, is a typical distributed energy use system composed of three parts, energy supply, energy use and waste heat recovery. In this paper, according to the process characteristics of two-stage expansion cryogenic separation plant, three-box analysis method was used, the system was compartmentalized into six subsystems, represented the exergy analysis model of system—unit—equipment, given the specific analysis process and the assessment rules for the NGL system. Using the practical operational data, the writers conduct the exergy analysis on the operational working condition of Daqing oilfield NGL system. Based on the calculation results, this paper raises some proposals to improve the operational efficiency, and achieved a good energy saving effect in engineering practice.
Research Progress of Liquid Desiccant Evaporative Cooling Air Conditioning System
Authors: Zou Tong Hua , Wang Min , Deng Sai Feng , Li Yong
Published: August 2013

Evaporative cooling technology is a refrigeration technology by water evaporating endothermic, with zero-pollution, environmental-friendly, energy saving, and other advantages, which makes it widely used. Nevertheless, due to its working characteristic, the application of evaporative cooling technology is limited, particularly in some areas with high humidity. Using the liquid desiccant dehumidification and evaporative cooling technology leads to a solution, named liquid desiccant evaporative cooling air conditioning system extends the application of evaporative cooling technology. This article on liquid desiccant evaporative cooling system provides a brief overview about research status, full usage of the low grade thermal energy, the practical application and new development of the system.
The Pressure Differential Analysis of LiCl Solution Absorption Process
Authors: Tang Chun Li , Wang Qian
Published: August 2013

To improve indoor air quality, mass transfer is an important part in air handling process, which is helpful for the control of humidity of air. This paper presents mass transfer dynamic analysis of isothermal and opposite flow process theoretically. The pressure difference analysis is used to show the changing of pressures of two phases in dehumidification process. It calculates the partial pressure of water vapor in wet air and the vapor pressure of LiCl solution. Also it gives the curves of pressure change in dehumidification of isothermal and opposite flow by lithium chloride. Results from this paper can be used as theoretical foundation for the experimental design of dehumidification of air by LiCl solution.
Study on Ground Source Heat Pump System of Combined Office and Residential Building in Hot Summer and Warm Winter Region
Authors: Hu Ying Ning , Liu Ya Zhao , Lin Jun , Wang Yan
Published: August 2013

A ground source heat pump system of combined office and residential buildings in hot summer and warm winter region is introduced. The system performance is studied through the experiment, and the performance of underground heat balance is analyzed by TRNSYS. The results show the superiority and applicability of the ground source heat pump system.
Effect of Inlet Prewhirl on Flow Field of Axial Flow Fan
Authors: Ye Zhou , Zhao Hai Yang , Yang Yang , Li Chun , Gao Wei
Published: August 2013

The flow in a single-stage fan is analyzed through numerical simulation. The results indicate that there exists a best prewhirl angle which can make flow loss minimal at a given flow rate. So we can improve the internal flow field structure by changing the prewhirl angle, thus the fan efficiency can be raised. In addition, the flow separation on the suction surface is sensitive to the variation of the prewhirl angle. The range of the separation on suction surface increases with the decrease of the prewhirl angle, and expands to the central area of the blades.
Design of Ground Source Heat Pump Air Conditioning System for the Office and the Restaurant
Authors: Huang Ke Wang
Published: August 2013

By comparing the three kinds of design of air conditioning system, and economic analysis, ground source heat pump system is selected to design the multi-storey office building and multilayer restaurant selection.
Simulation and Energy-Saving Algorithm Based on MRAC of VAV BOX
Authors: Chen Jia Shi , Wu Zheng Song , Liu Yang , Lin Shan Chi
Published: August 2013

A model reference adaptive control (MRAC) algorithm is proposed to the air-conditioning system of variable air volume (VAV) terminal units (VAV BOX). The study of temperature controlling parameters in room area (Zone) is based on Lyapunov stability theory. We built the simulation model in Matlab to validate the superior controlling performance and good energy saving effect of the algorithm. The research shows that the energy consumption release 60% ~70% in larger room. In modern building, the energy saving and comfort is very important, so the simulation has important engineering practical value.
A Preliminary Study on Lean Blowout of One Combustion Stability Device
Authors: Yuan Yi Xiang , Xie Peng Fu , Cao Wen Yu , Chen Cong , Yu Chao , Zhan De Jun , Tan Chun Qing
Published: August 2013

The lean blowout experiments of the combustion stability device A (multi-vortexes-dome combustor model) have been carried out at atmospheric pressure. In contrast with the experimental data of device B, and the result shows that the lean blowout performance of the device A is superior to the device B at low operating condition. Furthermore, both the devices A and B were modeled, and the combustion numerical simulations were performed with the steady Flamelet model of non-premixed combustion and the simplified mechanism of methane-air reaction with 14 species and 26 step elementary reactions. The numerical results are in agreement with the experimental phenomena.
An Islanding Detection Method Based on Q-Axis Disturbance Signal Injection
Authors: Liu Jian , Fang Hou Hui , Li Xian Feng
Published: August 2013

This paper puts forward a novel islanding detection method based on q-axis disturbance signal injection. This method, by introducing q-axis disturbance signal injection, makes the RLC load generate frequency offset to detect the island in the case that the power network is disconnected due to certain fault.The introduced q-axis disturbance signal injection method is connected with reactive power variation and frequency variation whose values are close to zero when photovoltaic system is operated in grid-connected mode. Therefore, the suggested method has the advantage of tiny harmonic distortion and good power quality. The simulation results based on the MATLAB/Simulink software show that the novel islanding detection method can detect the island in 1 second and has little effects on the system under the condition of the set parameters.
Case Study on the OOPP Theory Using AHP Method-Application in Improvement of Long Feng Hydropower
Authors: Gao Yu , Wang Song Jiang
Published: August 2013

It is essential for the small and medium-sized hydropower stations to choose a best project during the technological innovation and standardize management process. Thus, it can lay a solid foundation for the overall efficiency of enterprises in the future. Long Feng station is in the transition period after the acquisition and alteration, by data analysis, there are some questions: (1) management system is chaotic; (2) the overall quality is not high; (3) cost of power generation is high, but economic efficiency is low; (4) ecological environment pollution is serious; (5) living conditions of residents is threatened. To solve the above problems, this paper applies the OOPP theory as a guide and the Analytic Hierarchy Process as a tool in the alternative project analysis, combines the method of qualitative and quantitative, and finally can provide a valid scientific basis for decision to choose the best subproject.
Mid-Long Term Load Forecasting Based on Fuzzy Soft Set and D-S Evidence Theory
Authors: Niu Dong Xiao , Fan Lei Lei , Wu Qiao Ling , Ma Qing Guo , Tan Qin Liang
Published: August 2013

According to errors between the predicted values and the actual values, this paper establishes a fuzzy soft set in the form of membership function, then utilizes Dempster combination rule in evidence theory to synthesize the prediction results to obtain the weights of each single model, and thus builds a new hybrid combination forecasting model. The example shows that the proposed model can effectively improve the accuracy of mid-long term load forecasting, and is more accurate and credible than the combination forecasting model based on entropy or simply fuzzy soft set theory.
Optimizing the Operation of Distributed Generation Using Genetic Algorithms
Authors: Du Jun , Zhao Dong Yan , Wang Yu Bo
Published: August 2013

By the heuristic algorithm and particle swarm optimization algorithm combining hybrid particle swarm algorithm proposed combination of heuristic search and stochastic optimization,stochastic optimization process using a spanning tree and the loop matrix operations combined to ensure the system topology constraints to improve the efficiency of solution. The analysis shows that the proposed method calculation speed,easy to converge to the global optimal solution. Development of distributed generation units, along with concerns raised over the security of supply has prompted many customers to consider the installation of their own local capacity for generating electricity (and heat). This paper proposes a methodology for optimizing the operation of a portfolio of distributed units, based on profit maximization using genetic algorithms. The method is tested on a set of distributed units, demonstrating the ability to find good solutions in an acceptable time period.
Research and Simulation of Excitation Regulator Model Based on DSP
Authors: Zhang Zhi Tian , Shi Xiao Ping , Shi Xiao Ling
Published: August 2013

This paper introduces the research on the Excitation Regulator of the Synchronous Generator with dual CPUs, based on Digital Signal Processor (TMS320LF2812). With the multiple functions of monitoring, analysis, controlling and protection, it overcomes the shortage of the domestic excitation device in terms of self-monitoring and self-protection,which effectively improves device reliability. By analyzing the allocation of reactive load of the interconnected Synchronous Motor group, the model of the digital excitation regulator by Simulink of MATLAB is produced. The results of the simulation show that the proposed regulation model are feasible, satisfying various running demands of the Synchronous Motor and Power System.
Simulation Analysis of Zhengzhou Metro Power Supply System Rectifier Unit
Authors: Lou Bei , Guo Xi Peng , Xin Jun , Chen Gen Yong , Yang Jin Feng , Chen Xiao Yi
Published: August 2013

Developing the Zhengzhou rail transit as a new transportation plays an important role in easing traffic congestion and promoting the economic development. The principle, connection mode and harmonic generation mechanism of the rectifier unit of Zhengzhou rail transit is analysed in theoretical. 12-pulse and 24-pulse rectifier unit model is simulated in MATLAB/Simulink environment. The simulation result shows that the 24-pulse rectifier unit can reduce the harmonic current injected to the power system greatly, and abate the effects on the utility grid compared with the 12-pulse rectifier unit. The 24-pulse rectifier can smoothen the output voltage, reduce the harmonic content and improve the quality of DC power supply. So it can obviously reduce the adverse effects on public power grid.
Simulation and Analysis of Transformer Inrush Current and its Impact on Current Differential Protection
Authors: Wang Hui , Yan Kun , Gao Hou Lei , Chen Xue Wei
Published: August 2013

A transformer model was built using PSCAD. The generation mechanism, waveform characteristics and influence factors of inrush current were simulated and analyzed. Combined with transformer differential protection, this paper discussed the conventional methods to identify inrush current and the operation logic to prevent mal-operation caused by inrush current. The typical transformer differential protection operating criteria were also simulated under different fault conditions. The results show that digital simulation can properly present inrush current waveform characteristics, different kinds of transformer fault status and inrush current influence on differential protection.
Wind Farm Voltage Control Scheme to Improve Dynamic Voltage Stability
Authors: Guo Peng , Liu Wen Ying , Wang Wei , Wang Ning Bo , Jia Huai Sen
Published: August 2013

Dynamic voltage instability is one of the new problems with the fast development of wind farm clusters. This text is about the improvement of voltage stability of weak grid connected with wind turbine generators (WTGs). It focuses on the control strategy and mode of WTGs and dynamic reactive compensators during disturbance. Firstly, in order to propel WTGs outputting reactive power, the active control mode regarding both doubly fed induction generators (DFIGs) and permanent magnetic synchronous generators (PMSGs) is given. Secondly, the method of installing SVC at the terminal of part of WTGs is proposed. The selection of WTGs to install SVC is based on the sensitivity analysis. Thirdly, a coordinating method of various reactive sources is discussed. Finally, the comprehensive control logic under time series is listed. The simulation validates the methods above.
A New Topology for Simultaneous AC-DC Distribution with the same Line
Authors: Zhang Li , Yu Qing , Cao Lei , Zou Liang , Zhao Tong
Published: August 2013

A new topology for simultaneous AC-DC distribution along the same line is proposed in this paper to integrate DC power with the existing alternating current (AC) distribution, which incorporates a zigzag transformer and a boost chopper. The zigzag transformer is utilized to achieve either coupling or decoupling of the AC and DC power without sensible iron-core saturation due to voltage canceling out on one phase. The boost chopper is used to achieve DC power flow and keep the DC ratings at each node. A simulation model of the novel topology is established with PSCAD software, and detailed comparison verifies that the new topology with a zigzag transformer is preferable to that with a common transformer for simultaneous AC-DC distribution scheme, indicating a promising future of the proposed technology.
Development of a Measuring Device and Software for Measurement of Electric Power Quantities Based on IEEE Standard 1459-2010
Authors: Tanthadiloke Chamaiporn , Tayjasanant Thavatchai
Published: August 2013

This paper presents a development of measuring device and software for 3-phase measurement of electric power quantities according to IEEE Std. 1459-2010. Blackman-Harris windowed FFT algorithm is used for the harmonic analysis to reduce the errors from leakage problems. Result verification with a technical paper has been made. Actual implementation with an adjustable speed drive at a laboratory has been carried out and crosschecked with a commercial power quality meter.
Geometric Parameterization Technique Based Continuation Power Flow and its Applications in AC/DC Hybrid Power System
Authors: Guan Chao Jie , Zhao Jin Quan , Yin Jian Hua , Men Kun , Hong Chao
Published: August 2013

A new continuation power flow method based on local geometric parameterization technique is proposed for voltage stability analysis of AC/DC hybrid power system. By means of the alternating iteration method as the AC/DC power flow algorithm, the proposed method takes the coupling relationship between AC and DC systems into account to modify Jacobian matrix of AC system. Constraints of variables in DC system are also considered, as well as the adjustment of converter transformers tap position and the conversion of converters control modes. Based on the predictor-corrector method, this paper adopts the geometric corrector, and changes the direction of convergence effectively. According to different operation modes of AC/DC system, accurate voltage stability limit and the entire PV curve can be acquired. Simulation results of IEEE test systems are used to show the validity of the proposed algorithm.
Mid-Term Stability Assessment of Jiangxi Power Grid
Authors: Su Yong Chun , Jia Hao Wei
Published: August 2013

Mid-term stability assessment is an important work to support power system operation in a province power grid of China every year. The stability assessment method and process was introduced in this paper. As an example, the stability of Jiangxi province power system was evaluated in the following two years. Weak area and weak transmission line were found out in each power supply area. Prevention and control measures were proposed. According to problems among the assessment process and using the state monitoring data, an approach was discussed to increase the assessment result accuracy. The analysis conclusion provides the reference to the safe and stable operation of Jiangxi power system.
New Eigenvalue Method for Power System Stability Analysis
Authors: Li Chao Chun , Tseng Ta Hsiu , Huang Pei Hwa
Published: August 2013

The most widely adopted methodology for the analysis of power system small signal stability relies on the approach in the frequency domain, i.e. to linearize the system equation to obtain a linear model as well as the system matrix of which the eigenvalues can be calculated to determine the system stability. However, we often have high order of system matrix and thus it will be undesirable to calculate and analyze all the system eigenvalues. This paper is to explore the problem of small signal stability for power system and the main purpose is to find out the worst-damped mode of system eigenvalues and thus to alleviate the effort for computing and analyzing all the system eigenvalues. The developed algorithm is to be tested on a sample power system to validate the feasibility of the proposed new eigenvalue calculation method.
Simulation Analysis for the Impact of Voltage Distribution of Distribution System with Distributed Generation
Authors: Sheng Si Qing , Fan Lin Tao , Tan Xiao Lin
Published: August 2013

From the angle of voltage distribution, the influence of DG on power network was studied, various access position and access capacity of DG were analyzed, and conclusion can be drew that DG can help optimize the voltage distribution in the power network. Besides, the output of photovoltaic and wind power was characterized by varying with time, and based on that, the voltage distribution was simulated when they were both connected in the same distribution network. According to the simulation result, some valuable principles and necessary procedures have been proposed.
Study on Electric Energy Metering Program under the Impact of Distorted Waveform
Authors: Ba Ji Lun , Wang Hai Ming , Yao Meng , Deng Xiao Lei , Fang Xiang , Chen Gen Yong
Published: August 2013

Many factors affect the precision of electric energy metering in measuring process, and distorted waveform is one of them. Based on maths principle and equivalent circuit model, the metering error related to electronic energy meter algorithm (metering principle), current transformers and voltage transformers is analyzed. Corresponding improvement metering scheme is put forward. Finally, taking the common nonlinear load-AC EFA (electric arc furnace) as an example, it is simulated in the MATLAB/Simulink simulation platform. The results validate the conclusions of the error analysis and some methods proposed to improve the rationality of actual metering operation significantly.
Unbiased Direct DGM(1,1) Model of Non-Homogeneous Exponential Sequence and its Application in Electric Load Forecasting
Authors: Zhou De Qiang
Published: August 2013

The traditional GM (1,1) has been used widely in the load forecasting, however, there are many defects in the GM (1,1). In order to overcome these defects and expand the application scope of the grey model in load forecasting, a new load forecasting method based on DDGM(1,1) is presented. First, the recursive solution of DDGM(1,1) is given. Then, based on the solution, the unbiased property for non-homogeneous exponential incremental sequence of this model is proved. It is applied to some load forecasting and is compared with the traditional GM (1,1) model.The results show that the presented forecasting method is superior obviously to traditional methods, and it can be used for the approximate non-homogeneous exponential incremental load forecasting generally.
Geological Characteristics of Viscous Reservoirs & Mining Safety Technical in Northern Tibet Plateau
Authors: Zhu Wei , Cao Zi Jian
Published: August 2013

According to geological characteristics and the occurrence of heavy oil properties in the northern Tibetan plateau, the development feasibility studies and risk analysis were carried out . A detailed examination of the effects of diagenesis were conducted in terms of microcopic observation , stratigraphic facies and other low permeability reservoir aspects. The main factor affecting reservoir properties was theorized. Finally, the reservoir development risk is illustrated. Measures of the reservoir protection and efficient exploitation were presented. The results show that diagenetic compaction and cementation makes greate impact on the reservoir properties distribution .And it is recommended to use the steam stimulation method test mining , the method is less investment , the technology is simple , fast yield , good economic returns .
Direct Reduction Experiment on Low-Grade Limonite at JiangXi
Authors: Chen Jiang An , Liu Jun
Published: August 2013

Considered the properties of limonite ore at Jiangxi, the raw ore pressing ball - direct reduction - magnetic separation flowsheet have been adopted. the pressing ball conditions, the influence factors and the grinding magnetic separation conditions experiments were carried out. The results shown that: When the dosage of coal was 20%, water was 10%, CMC was 0.5%, pressing ball under the pressure of 190 kN, the calcination temperature was 1100 °C, the roasting time is 50 min, roasted ore were magnetic separated after grinded to 85% through 200 mesh screen. the iron concentrate grade of 92.48% and recovery rate of 93.45% were achieved finally.
Experimental Study on Extraction of Scandium from Complex Silicate Ore
Authors: Yang Qing Rong , Zhang Gui Fang , Yan Peng
Published: August 2013

Based on leaching experiments of complex silicate ore contenting scandium, the research has adopted extraction to concentrate scandium and separate impurity. The emphasis of this reaserch is the impact factors, so the experiments including extractant concentration, organic aqueous ratio, mixing time, organic phase washing, organic phase reextraction, have been conducted. The optimal conditions are that the concentration of extraction is 25%, the O/A is 1:10, the mixing time is 3min, the washing time is 3, the O/A of reextraction is 1:2.3, and the extraction rate of exceeding 98% and reextracion rate of 99.01% were obtained when adopting P501 as the extraction agent.
Material Flow of the Mineral Resource Development
Authors: Du Qin Jun , Su Liu Liu , Liu Ming Min
Published: August 2013

On the basis of the meaning of material metabolism of mineral resources development (MRD), its characteristics are analyzed, such as complexity, controllability, consecution and differences. The material flow analysis on MRD can provide basis in environment pressure of mineral resources analyzing and provide support for the circulation economy of mineral industry. The analytical method of the material flow analysis of MRD is put forward, and the account system and index system are set up.
Research on the Flotation Process of Old Tailing in Burma
Authors: Yang Jun Long , Liu Quan Jun , Guo Yan Hua , Jiang Mei Guang , Xiao Hong
Published: August 2013

The test simple was taken from old tailing in Burma. The results of the chemical analysis and the phase analysis indicated that the grade of Lead was 2.84%, with the oxidation rate of 58.33% and the grade of zinc was 3.22%, with the oxidation rate of 16.56% in the old tailing. Through the research of the flotation separation test, the optimal grinding fineness (-0.044mm) was accounts for 73%. The optimum dosage of sodium sulfide was 1500g/t and the dosage of potassium dichromate was 600g/t. The separation effect of copper and lead was better, the ultimate concentration index: the grade of copper was 16.58% in the copper concentrate and the recovery was 56.18%. The grade of lead was 48.83% and the recovery was 96.67% in the lead concentrate.
Study of Manufacture Process and Properties of Tailings and Slag Based Mine Filling Cementitious Materials
Authors: Zhang Jin Xia , Liu Shu Xian , Xie Jun
Published: August 2013

The tailings and slag based mine filling cementitious materials was prepared by sodium silicate and sodium hydroxide alkali-activated tailings and slag. Through the test that the cementing materials in the best ratio of raw materials: when slag and tailings admixture is 1.25, the content of NaOH was 50%, the amount of sodium hydroxide for 50%, water cement ratio of 0.22, under the condition of normal temperature curing 7 days, eventually making a compressive strength of 52.3MPa cementing materials.
High Resolution Sequence Stratigraphy of Silurian Strata in Tazhong Area
Authors: Zhang Lei , Zhu Lun Wei , Zhang Xue Juan
Published: August 2013

According to the fundamental principles of high resolution sequence stratigraphy, this paper focused on the application of high resolution sequence stratigraphy to Silurian strata in Tazhong area. Based on the comprehensive study of logging, drilling and seismic information, the high resolution sequence boundaries of Silurian strata and two scales of datum level cycles (long-term and intermediate-term) can be recognized in Tazhong area. Seven chronstratigraphic boundaries can be recognized in Silurian strata, including four sequence boundaries, which were the transformation from datum level falling to datum level rising, and three flooding surfaces, which the transformation from datum level rising to datum level falling. The Silurian strata in Tazhong area can be divided into three third-order sequences which correspond to three long-term datum level cycles, and 11 fourth-order sequences (parasequence sets) relating to 11 intermediate-term datum level cycles. The classification aforementioned can much better solved the corresponding problem between the six lithological sections of Silurian strata and sequence formations, finally establishes the high resolution sequence stratigraphic framework of Silurian strata in Tazhong area.
The Experiments for the Impact of Temperature on the Grinding Rate about Zhao Tong Bauxite
Authors: Wang Qing Hong , Zhuang Gu Zhang , Wang Chun Mei
Published: August 2013

The viscosity of Pulp will affect the grinding rate directly, Elevated temperature, the slurry viscosity reduced. In order to study the effect on the grinding rate of temperature, we did the experiment by only changing the temperature, and three groups of contrast test was carried out. The results show that the grinding rate is improved obviously, when the grinding temperature increases from 16 °C to 42 °C.
A Fuzzy Method to Evaluate Remaining Oil Potentiality of PI Group
Authors: Liu Jian Zhong , Xu Jin Cheng
Published: August 2013

The remaining oil distribution and its potential evaluation are the keys to the well network adjustments and comprehensive potential exploration on the later stage production. In view of the vagueness of the influence factors of remaining oil potentiality, a set of quantitative evaluate method about how to suit remaining oil potentiality of heavy oil reservoir at high water-cut stage is established. Six factors are taken into consideration, including oil saturation, reservoir thickness, permeability, porosity, water injection distance and sedimentary facies. First, make sure the evaluate criterion and the influence weight of a single effect factor. And then, use the fuzzy theory to calculate the latent capacity of the block, comprehending many factors. In the end, certain the foundation of remaining oil potentialities according to the value of the latent capacity. Using this method, remaining oil potentiality of the east of Beierxi is calculated at high water cut period. This provides a theoretical guide to formulation and implementation of the in-situ potential measurement.
Analysis of Production Characteristics and Prediction of Recovery of Lianhua Oil Layer in Qi 3-17-5 Block
Authors: Lan Jin Yu , Zhang Ji Cheng , Wei Jian Cheng
Published: August 2013

Through thirty years of development, Lianhua oil reservoir has entered into the stage of low-speed development. At present, the rate of oil production is only 0.0033%. Firstly, it divided development stage of Lianhua reservoir and analyzed production characteristics of each stage. By mean of the production decline curve, it predicted the recovery of the reservoir to estimate the ultimate recoverable reserves and the recovery percent. The results show that the ultimate recoverable reserves of Lianhua reservoir was about 50.813×104 t, the ultimate recovery was 13.177%, the recovery percent of recoverable reserves had reached up to 95.094%, and the remaining recoverable reserves were rare. Therefore, it urgently needs to find a more reasonable development model to do secondary development of Lianhua reservoir. The conclusions have an important realistic significance of guiding secondary development of the Lianhua reservoir.
Cascade Utilization of Waste Heat in Heavy Oil Exploitation by SAGD Technology
Authors: Liu Li Jun , Liu Xiao Yan , Zhang Xue Ping
Published: August 2013

SAGD technology is utilized to exploit heavy oil in Du 84 block Shu 1 area of Liaohe Oilfield, the temperature of wellhead produced fluid can reach up to 170-180°C. To avoid wasting the thermal energy, a set of scheme of cascade utilization of waste heat was proposed to combine the generation of electrical energy and heating in this paper. The generating capacity, heating area and its economic efficiency are calculated and analyzed in this scheme. In addition, taking the annual total cost of the condenser as the objective function, the parameters of the condenser are optimized by using optimal function in MATLAB software. The results can be used to conduct the design of the waste heat utilization system in practical project. Keywords-; Energy saving; optimal design; low temperature waste heat; SAGD
Compressible Fluids Mitigation Effect Research in Deepwater Oil and Gas Well
Authors: Han Xuan Zhuo , Gao Bao Kui , Zhang Hong Qiang , Qin Xing , Wang Wei
Published: August 2013

During well drilling and petroleum production in deepwater, wellhole temperature changes will cause annular pressure buildup (APB), which is of great danger to casing strings. Based on previous research results, this paper introduces the traditional bulk modulus elasticity calculation method of mixed gas and liquid into annulus fluids, to predict annular pressure buildup by thermal when gas mixture is used. Pressure mitigation effect of common used compressible fluid is investigated and compared with experiment results from references. Through engineering case, the changing rule of mixed fluid bulk modulus versus gas volume and impact of mixed fluid volume on annular pressure are calculated. It shows that bulk modulus obtained in this paper has small errors compared with simulation experiment. But the errors are acceptable in engineering environment. And so, annular pressures needed in a well can be predicted and controlled precisely by adjusting gas volume as shown in examples.
Controlling Factors of Hydrocarbon Accumulation in Talaha-Changjiaweizi Area
Authors: Yuan Hong Qi , Yu Ying Hua , Liu Fang
Published: August 2013

Based on the analysis of the relationships between the conditions of structures, sedimentations, source rocks, cap rocks, faults, oil and gas migration passages and traps and hydrocarbon accumulation, the controlling factors of hydrocarbon accumulation and distribution was studied in Talaha-changjiaweizi area. It is held that the source rocks control the hydrocarbon vertical distribution, the drainage capabilities control the hydrocarbon plane distribution, fracture belts control the hydrocarbon accumulation of Talaha syncline, underwater distributary channel is a favorable accumulation environment and reservoir physical properties control the oil and water distributions. Therefore, it is concluded that source rocks, fracture belts, sedimentary microfacies and reservoir physical properties are the main controlling factors of hydrocarbon accumulation and distribution in Talaha-changjiaweizi area.
Evaluation of Potential of Remaining Oil after Polymer Flooding
Authors: Sun Li Yan , Shi Hai Dong , Yang Hao , Zhang Ji Cheng
Published: August 2013

Figuring out the rule of remaining oil distribution after polymer flooding is the basis for continuing study on development policy after polymer flooding in Daqing Oil Field. Based on the basic principles of percolation mechanics, percolation mechanics of polymer flooding reservoirs under fixed injection pressure and injection rate was studied, the mechanism of remaining oil changes after polymer flooding was investigated; According to the numerical simulation results, the rule of remaining oil distribution in Daqing oilfield has been given out. This will be theoretical and practical guidance for enhancing oil recovery after polymer flooding.
Investigation on Polymer Adsorption and Retention in a Polymer Flooded Reservoir
Authors: Liu Shu Qiang , Zhang Ji Cheng , Xu Jin Cheng
Published: August 2013

During polymer flooding, certain amount of polymer would be lost. Polymer retention causes sweep volume expanding on one side, it also causes polymer loss on the other. Therefore, it is a very important topic to study the influencing factors of polymer retention. There are many factors affecting polymer retention process. This paper mainly studied the influence from dynamic factors such as polymer solution concentration, injection rate, injection time, injected pv number. This paper investigated the influence of these factors on polymer retention process, and optimized these factors to minimize polymer loss in reservoir.
Oil Containment by Floating Boom under Wave-Current Coupling Condition I: Numerical Experimental Platform
Authors: Feng Xing , Zheng Qing Gong , Wu Wan Qing
Published: August 2013

Based on the Navier-Stokes equations for viscous, incompressible fluid and analytic relaxation approach, the 2-D numerical wave and current tank of the viscous fluid with constant depth is established, the volume of fluid (VOF) model is used to track the free surface for simulating the oil containment by rigid floating boom under wave and current conditions, and the motion of boom is accomplished by the technique of dynamic mesh. Then the variation of the oil shape under pure current condition, coplanar current condition and counter current condition were numerically studied, the effects of wave parameters on oil shape before boom were analyzed. The computed results are in general agreement with those obtained from previous studies.
Optimization Technique in Double Stepped Thin Horizontal Well
Authors: Fan Sen , Li Yue Xiang , Cao Jin Qiang , Xie Jian Bo
Published: August 2013

Oil industry at home and abroad has paid attention to the usage of horizontal well with the development of horizontal drilling technology, the number of horizontal well is increasing year by year inland, but some horizontal well constructions in thin oil pay is not ideal. Nanzhong 1H well has used double stepped horizontal well technology to develop thin oil pay, it has optimized the constructions in different stages and combined the steering technique in the drilling practice of thin oil pay, it has accelerated the drilling speed and reached the target fast and safely. It provides the reference for the further development of deep thin oil pay of horizontal well technology.
Scheme to Tap Remaining Oil Potential in Poor Pay Zones
Authors: Zhang Ji Cheng , Zhao Shu Hong , Lan Jin Yu , Song Kao Ping
Published: August 2013

This paper analyzed the balanced flood performance of various layers and the remaining oil distribution through numerical simulation technique. It shows that, the main remaining oil type of intended layers is caused by voidage-injection imperfection. Considering the needs of the follow-up infill well pattern and tertiary oil recovery, we decide to maintain the relative independence and integrity of each well network without disturbing the pattern configuration and the mining exploit object of various sets of well pattern. Finally we confirm to perforate adding the first infill wells of intended layers to consummate the water flooding regime. Through analyzing the production target of different well pattern optimization programs relatively, it shows that the best program has regular well pattern and large drilled thickness.
Study of Development of Medium-Deep Heavy Oil Reservoir Pilot Tests in Henan Oilfield
Authors: Xu Dong Jin , Liao Rui Quan , Zhang Fan , Liu Jie , Zheng Heng
Published: August 2013

Henan Oilfield Xiaermen Qianbei block is the medium-deep heavy oil reservoir. Due to the high viscosity of crude oil, formation cementation loose, sand production and reservoir water-sensitive, the pre-trial is less effective. The problem is the inefficiency of steam injection, poor oil-steam ratio, sand production serious, the poor pump efficiency and the abnormal productions. It is important to improve the mobility of heavy oil in the formation and wellbore for the development. According to the reservoir characteristics and the experience of the primary development, the measures which include the high-pressure gravel packing sand control, insulated tubing of steam injection, anti-swelling agent reservoir protection, formation and wellbore viscosity reducer and rod sucker-rod pumping system are carried out in a pilot test of the four wells. After the pilot test, the oil-steam ratio increases from 0.08 to 0.55, the average daily oil production increases from 0.5 tons to 8.0 tons. The pilot test has achieved great success and promoted the application in medium-deep heavy oil thermal recovery in the entire block, simultaneously provided the basis for the efficient development of other similar blocks.
The Hydrodynamic Response and Frequency Domain Analysis of Deep Sea Truss Spar Platform
Authors: Sang Song , Shi Xiao , Li Chang Dong
Published: August 2013

With the development of marine oil going to the deeper water area, SPAR platform with its many advantages has gradually become the mainstream of the offshore oil and gas production facilities. In this paper, the Spar platform three-dimensional hydrodynamic model establish is established firstly, then the floating body hydrodynamic is calculated by using the three-dimensional flow theory to get Spar platforms transfer function and hydrodynamic parameters of its motion response. At last, the frequency domain for floating body and mooring system coupling calculation model is analyzed.
The Seepage Pressure Distribution and the Capacity of Low-Permeability Reservoirs Gas
Authors: Yan Liang Dong , Gao Zhi Juan
Published: August 2013

Low-permeability gas reservoirs are influenced by slippage effect (Klinkenberg effect) , which leads to the different of gas in low-permeability and conventional reservoirs. According to the mechanism and mathematical model of slippage effect, the pressure distribution and flow state of flow in low-permeability gas reservoirs, and the capacity of low-permeability gas well are simulated by using the actual production datum.
A Combined Solution Model for Predicting Development Performance of Low Permeability Reservoirs
Authors: Zhang Huan Huan , Yin Hong Jun , Fu Chun Quan , Wang Mei Nan
Published: August 2013

Production prediction model and waterflooding characteristic equation considering threshold pressure were deduced. Based on them, a combined solution model was established, which can predict development indexes in low permeability reservoirs. The development indexes of a typical low permeability block YS2 were forecast using the combined solution model. Forecast results and actual production data fit well, which confirms the practicability and validity of the combined solution model. It has important practical significance to guide low permeability oilfield development.