bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Pyrolysis Kinetics of HCl-Pretreated Soybean Stalk
Authors: Chen Dong Yu , Hu Yan Qing , Liu Qing Yu
Published: June 2014

To study the influences of the acid-washing on the characteristics of soybean stalk pyrolysis , and search the high-efficiency catalyst for biomass pyrolysis, pyrolysis experiments of soybean stalk pretreated by 0.1mol/L HCl acid solution were performed by nonisothermal thermogravimetric analysis (TGA) at five different heating rates. The results showed the pyrolysis process of HCl-washed soybean stalk can be separated into four stages (water loss, depolymeri-zation and vitrification, thermal decomposition, and carbonization). At the same heating rate, the maximum pyrolysis rate of HCl-washed is larger than untreated soybean stalk, but the corresponding temperature is higher. All the DTG (differential thermogravimetric) curveas appear a smaller shoulder peak respectively. With the heating rate increasing, the main pyrolysis zone of the TG (thermogravimetric) and DTG curves move to the high-temperature direction, and the maximum pyrolysis rate and its corresponding temperature increase too. HCl-wahsed makes the weight loss rate of the final temperature increase 5% approximately. The value area of activation energy of the main pyrolysis area is 140.19~174.59 kJ/mol calculated by the method of Ozawa. The Šatava method inferred the most possible mechanism function of HCl-wahsed soybean stalk is Zhuralev-Lesakin-Tempelman equation, which is three-dimensional diffusion.
The Research on Palm Oil as Potential New Energy Source in China
Authors: Song Chun
Published: June 2014

Oil palm is an important oil crop. This paper introduces the background of palm oil utilization, summarizes its advantages over other biodiesel resources, the feasibility of China developing palm oil as new energy resource based on the current utilization status, and discusses the possible environmental effect that planting might result.
Design of Photovoltaic Power Generation Forecasting Model Based on Multivariable Grey Theory
Authors: Zhong Zhi Feng , Yan Chen Yang , Zhang Tian Jin , Tian Mao
Published: June 2014

This paper makes a prediction about the daily power generation of the photovoltaic power station in Wuhan International Exhibition Center by the application of multivariable grey theory model and compares the forecasted results with the real results. This research proves that the application of the theory of multivariable grey model on short-term prediction of photovoltaic power generation can achieve a good prediction effect, which also has certain engineering application value.
Using Two-Phase Anaerobic Digestion for Organic Waste
Authors: Yin Fang , Zhang Wu Di , Liu Jing , Yang Hong
Published: June 2014

The essence of the two phase anaerobic biological treatment process is to place acid bacteria and methane-producing bacteria in two reactors respectively, where it can provide the optimal conditions for their growth and metabolism, allowing them to live up to their maximal activity, which greatly improve processing capacity and efficiency compared to a single-phase anaerobic digestion. The paper start with the two phase anaerobic digestion process, in order to discuss the development direction of high efficient anaerobic digestion system.
Biogas Production from Swine Manure Co-Digestion with Hyacinth
Authors: Thayai Sorrasak , Vivanpatarakij Supawat
Published: June 2014

The suitable ratio between swine manure and hyacinth for biogas production was considered. From Ratchaburi Province, the swine manure and hyacinth were taken from the pig farm and natural canal, respectively. For this study, mixing ratios between swine manure with hyacinth are 0:100, 25:75, 50:50, 75:25 and 100:0, considered by dry basis. The anaerobic digesters were studied total mixing volume 300 ml in 500 ml volumetric flask on shaker. Total dry substrate is 2 g every ratio, swine manure and hyacinth. And microbial inoculum from pig farm is 3 g (dry basis). The experimental results showed the proportion of 0:100 illustrate the maximum quantity of biogas accumulated equal 243.48 ml. And the ratio of 100:0 shows the minimum cumulative biogas volume equal 33.60 ml. The analysis of the gas production, the blend of swine manure per hyacinth has the highest percentage of methane ratio is 0:100 (CH4=6.4%), and the lowest percentage is the ratio of 100:0 (CH4=0.5 %). For carbon dioxide production, the highest percentage of carbon dioxide is ratio of 0:100 (CO2=4.1 %) and the lowest is ratio 100:0 (CO2=0.9 %). Percentage of methane to compare with total percentage of methane and carbon dioxide has the highest percentage is the ratio of 25:75 (CH4=63.9 %), and the lowest percentage is the ratio of 100:0 (CH4=35.7 %). The highest to compare the lowest, percentage of methane per total percentage of methane and carbon dioxide is percentage of methane ratio 25:75 more than ratio 100:0 is 1.79.
Study on Pyrolysis Characteristics of Biomass with TG-FTIR
Authors: Su Gui Qiu , Zhang Zhong Wei , Lu Hong Bo
Published: June 2014

The thermal gasification characteristics of biomass straw would be studied with thermo gravimetric (TG), and Fourier Transform Infrared Spectroscopy (FTIR) is used for the real-time monitoring on gasification products during biomass pyrolysis. By the method of thermo gravimetric analyzer combined with Fourier Transform Infrared Spectroscopy experiment. Pyrolysis characteristics and products of biomass straw were experimental explored and analyzed to get pyrolysis characteristics of experimental samples and reaction products, which provided based professional information for effective utilization of biomass straw.
Study of the Effect of the Operating Conditions on the MCFC-Biomass Gasification Power Generation System
Authors: Liu Ai Guo , Wang Bing , Liu Kai , Wang Cheng Jun
Published: June 2014

The combination of biomass gasification and molten carbonate fuel/micro-gas turbine (MCFC/MGT) hybrid system offers great potential as a future sustainable power generation system. A numerical model of a 100 kW classic MCFC/MGT hybrid system using biomass syngas as fuel has been developed. The simulation was performed to investigate the influence of operation conditions and the syngas compositions on the system performance. The results show that the MCFC/MGT can keep its performance when using syngas gas as fuel which confirms the feasibility of biomass gasification-MCFC/MGT hybrid system. According to the simulation results, the increase of MGT pressure ration and MCFC inlet temperature positively affects the system performance, the fluctuation of syngas composition has little effects on the system.
Pyrolysis Characteristics and Kinetics of Cassava Residues
Authors: Jia Jin Wei , Yang Di , Hui He Long , Fu Xing Min , Liu Lu , Yang Feng Sheng , Wei Yun Zhao , Lu Ming Yuan , Shu Xin Qian
Published: June 2014

The aims of this work were to investigate the influence of feedstock properties of different part of cassava residues (cassava rhizome (CR), cassava stalk (CS) and cassava leaf (CL)) and operating temperatures on the pyrolysis characteristics and the kinetic parameters. Pyrolysis experiments of three selected biomass feedstock were conducted using a fixed-bed reactor. It was shown that the bio-oil yield of cassava stalk reached the maxima at 600°C, and the char yield reduced with the temperature, whereas the gas yield increased with temperature. The cassava rhizome presented higher thermochemical reactivity than the other samples. The activation energy of cassava stalks was 37.57 kJ / mol and that of cassava rhizome (39.42 kJ / mol) increased slightly. The activation energy of cassava leaf (22.85 kJ / mol) was lowest of the three samples.
A Control Strategy for Transient Stability Improvement of Doubly-Fed Wind Power Generation System
Authors: Xu Chao , Lu Jin Ling , Zhou Jin Long
Published: June 2014

A novel inverter control strategy to enhance the transient stability of grid-connected wind farm based on doubly-fed induction generator (DFIG) is presented. Adding transient angle control strategy in the rotor side converter active control loop, this can dissipate the system unbalancing energy and restrain the system oscillations by the variation of wind turbine speed. Adding transient voltage control strategy in reactive control loop, this can provide fast reactive power compensation and support the restoration and reconstruction of the grid voltage when fault occurred. The control strategy which can improve the transient Angle stability and transient voltage stability at the same time is put forward. Finally, a testing system including a DFIG-based wind farm is realized using DigSILENT/Power Factory, the strategy validation and the contribution to power system stability enhancement are verified by simulation.
Power Generation Stability of Hydraulic-Type Wind Power Generation System
Authors: Xie Fang Wei , Sheng Gang , Wang Cun Tang , Xuan Rui , Zhang Kai , Ren Fei
Published: June 2014

Due to the defect of the traditional wind power generation equipment, the hydraulic-type wind power generation (HWPG) system has gained extensive attention. In order to study the generating stability of the HWPG system, we established the mathematic model of the off-network HWPG system in this paper; and built its simulation model by using MATLAB/Simulink to investigate the speed and power of the system with the sinusoidal input signal. The simulation results show that the output electric energy of the hydraulic type wind power is unstable. Therefore, to enhance the practical application effects of the off-grid HWPG system, we have to add a storage equipment or speed controller of the motor to improve the quality of output electric energy.
A Optimal Scheduling Method Based on Source and Load Interactive for Power System with Large-Scale Wind Power Integrated
Authors: Wen Jing , Liu Wen Ying , Xie Chang
Published: June 2014

The random fluctuation and anti-peaking characteristics of wind power has brought new problems for the power system optimal dispatch. Based on the interaction characteristic of the load, this paper played the utility of interactive load which can help system consumers the positive and negative fluctuations of wind power, and considered interactive load as a scheduling resource into the traditional day-ahead scheduling model. Taking into account the effects of interactive load on system operating costs and power flow distribution, this paper established a generation scheduling model which the aim are both the system operating costs and network loss minimization in large-capacity wind power integrated system, and reformulated the multi-objective optimization problem into a single objective nonlinear programming problem by means of the fuzzy theory, and made the generation side and the demand side of the power grid can participate optimal allocation of resources, and provided a new ideas and methods for achieving source and load interactive in smart grid environment. The simulation on IEEE 30-bus system indicated this method can reduce system operating costs and network losses effectively, and improve wind power consumptive level as well as too.
A Summary Research of the Solar Air Collector
Authors: Wang Lin Jun , Gao Zhang Wei , Zhang Dong , Liu Wei
Published: June 2014

The solar air collector is a kind of commonly solar thermal device, which has simple structure and low cost. And it is widely used in building heating, product drying and other areas. The paper broadly introduces working principles, advantages and disadvantages of the solar air collector. And it emphasizes to introduce research status of the solar air collector, at same time the paper gives some opinions about the future developing direction of the solar air collector.
A Pilot Study of Vertical-Axis Turbine Wind Farm Layout Planning
Authors: Shyu Lih Shyng
Published: June 2014

The purpose of this study is to investigate the parameters that affect the cost-effectiveness of wind farm land use and wind energy harvesting efficiency. The research team applies two reverse rotating vertical-axis wind turbines (VAWTs) to explore how wind speed and various distances of wind turbines affect the operation efficiency of a prospective wind farm. A data acquisition system has been constructed to record the wind speed along with a variety of wind turbine output data in a wind tunnel test in order to identify the layout that help to achieve the best wind harvesting efficiency. The layout is then applied in the field test for further observation and data collection. The experiment results show 1) when two VAWTs are moved toward each other (from 300 cm to 180 cm), both turbines observe performance gain, and 2) when two VAWTs are set at a distance of 1.5 to 2.0 times the turbine diameter, the performance of both units increases by about 11% over the efficiency obtainable by their stand-alone counterpart.
A Study on the Influence of Wind Power Development on the Formation of Beijing-Tianjin-Hebei Haze in China
Authors: Li Yong Gang , Yan Li
Published: June 2014

The development of wind power is growing rapidly in recent years. At the same time, the environment problem has been increasingly prominent, especially the haze. Through the analysis of large numbers of data, it is not hard to find the formation of haze is almost synchronous with the development of wind power. Whether there being some inevitable connection, is the focus of this research. In this paper, through theoretical analysis and practice analysis, it shows that the distribution of wind power plants can reduce its downstream wind speed. And this paper puts forward some new recommendations for the future planning and construction of wind power.
Comparative Study of Probability Distribution Functions of Wind Power Variation
Authors: Dai An Jue , Wang Qian , Zhou Yan Nan
Published: June 2014

This work focuses on the probability distribution function of wind power variation. After analyzing the characters of the power fluctuation data, normal distribution function, t location-scale distribution function and mixed second-order one-dimensional Gaussian distribution function are chosen to describe the wind power variation. Then K-S test(Kolmogorov-Smirnov) test and Pearson product-moment correlation coefficient are used to evaluate the fitting effect of the three distribution functions respectively, which indicates that the mixed second-order one-dimensional Gaussian distribution is the most appropriate one. At last, the factors affecting the parameters of Gaussian mixture distribution and to what degree they can achieve are investigated.
Review on the Application of Numerical Weather Prediction in the Simulation Research of Atmospheric Dispersion
Authors: Wang Bo , Zhang Chun Ming , Liu Fu Dong , Yang Yang , Wang Liang , Guo Rui Ping , Qiao Ya Hua , Liu Yong Ye , Yu Shao Qing , Zhang Qiong
Published: June 2014

The spatial and temporal variations of wind field and the atmospheric turbulence characteristics are important factors that affect the migration and dispersion of local atmospheric pollutants. Since the numerical meteorological forecasting system with high resolution is the foundation of atmospheric dispersion simulation, more and more attention has been drawn to the application of numerical weather prediction systems in wind field prediction and atmospheric simulation. This paper reviewed the widespread application of numerical weather prediction systems in wind field prediction and atmospheric simulation with the focus on the mesoscale weather forecasting system with high resolution, for instance WRF and MM5, as well as the requirement for numerical weather prediction in the simulation research of wind field prediction and atmospheric dispersion.
Research on Dynamic Characteristic of Rotor System for Small Maglev Wind Turbine Generator
Authors: Peng Shi Min , Dong Ru Hao , Li Bo Yu , Liu Ming Xue
Published: June 2014

Aiming at the small magnetic wind turbine, finite element software ANSYS is used to establish the model of rotor system with passive magnetic bearing, and obtain the vibration mode and critical speed of rotor system in situations: free-free, rigid bearing, hybrid combination of elastic and rigid bearing. Experimental analysis of critical speed of the rotor system can be conducted with the testing platform built by the B&K Vibration Measuring System.The result shows that the simulation analysis are approximately agreed with the experiment result. The simulation analysis has instructive significance in the structure optimization of magnetic bearing and rotor system and provides basis for vibration characteristic analysis of permanent maglev wind turbine generator and dynamic characteristics of structure.
Wind Energy Resource Assessment of Henan Province
Authors: Pan Pan , Gu Wan Long , Zhu Ye Yu
Published: June 2014

With the observation data of the whole year from November 2012 to October 2013 and results of numerical simulation, we do some research on the wind energy resources of Henan Province. Variation of wind energy resources is generally better in winter and spring, poor in summer and autumn. Diurnal variation of wind resources across different, but most good wind resource areas are located at higher elevations, and wind resource is generally better at daytime than night. Wind resources of Henan province is relatively limited, which can be technology developed are located in hills area and the mountain highlands of northern, central, western and southern part. Better resources are mainly located on hilltop and ridge.
Wind Generator State Recognition Based on Information Fusion Technology
Authors: Yang Wen Zhi , Li Hua , Cao Ju Feng , Feng Zhi Bin
Published: June 2014

This paper mainly researches on information fusion technology in the application of wind generator state recognition. Set up the model of information fusion based on bayesian theory, and develop status identification system by the platform of Labview. Conduct the test on Drivetrain Diagnosis Simulator (DDS), Simulate the normal and fault condition of wind generator main drive system by using normal and fault gear. Collect the vibration data, extract time domain feature parameters of the vibration signal, and train the identification system with these features. Verify the accuracy of the recognition system through the experiment.
A Planet Bearing Fault Case of Wind Turbine Gearbox
Authors: Xu Jia , Zhang Jin , Chen Tie , Liu Rui Hua
Published: June 2014

Doubly-fed wind power generator takes the largest share of wind energy. However, as the most important part, the speed-up gearbox is easy to be damaged. The existing researches about gearbox faults are mainly about gear fault, the study of bearing fault is relatively less compared with gear fault, expecially for the bearing fault of planet gear. This article presents a typical case of bearing fault about planet gear, which contains the cause of vibration behaviour and the analysis of fault.
Near-Surface Wind Speed Fluctuation and its Impact on Wind Power in Jiuquan
Authors: Wang Xing , Wang Bo , Li Xiao Xia , Ma Peng Li
Published: June 2014

With the use of representative observed wind speed data for a whole year in Jiuquan field in Gansu province of Hexi Corridor ,we analysed the characteristics of ten-minutes wind speed, diurnal wind speed, monthly wind speed variation , as well as the influence of the wind power change rate in different time periods and diurnal variation in four seasons. Studies have shown that ten-minutes short-term wind turbulence characteristics was more obvious, with some randomness , but mainly exhibited typical diurnal characteristics of variation. In addition to mean state of wind conditions, there were sustained gale, short-term gale, continued small wind, regular small wind appeared. Monthly variation of wind speed is characterized by the "three peaks and three valleys" , showing the regular change that wind speed was larger in spring and summer , and it was smaller in autumn and winter. Daily fluctuation of wind electricity generation in four seasons presented similar trends, it was a peak-valley feature, valley generally appeared between 9-11 a.m., the peak occurred between 5-7 p.m..Wind power got larger between 1 and 11 p.m., this period was the peak electricity needed, wind power added can significantly ease the power grid pressure and will has significant positive effect for the power grid control. Ten-minute power variation was relatively stable, with the time interval increased, variation in electricity generation of one day rate increased gradually.
Analysis on Negative Peak Regulation Ability of Regional Power Grid and Constrained Receivability of Wind Power Capacity
Authors: Ren Jie , Chen De Zhi , Gao Feng , Wang He Nan , Tian Jian She , Xiang Li , Ding Mao Sheng
Published: June 2014

As wind power in China is developing more and more rapidly, the characteristics of wind power output such as randomness and volatility have brought great pressure to the system peak load regulation. On the basis of defining negative peak regulation ability, this paper gives out the calculation formula of negative peak regulation ability including wind power and the main factors of influencing the negative peak regulation ability are calculated. Aimed at the regional power grid in the target year 2014, this paper makes some analytical prediction on such main factors and calculates the negative peak regulation ability, and the amount of the acceptance of wind power bound by it, and makes some sensitivity analysis of the negative peak regulation ability and the amount of the acceptance of wind power.
Coupled Simulation and Analysis of Wind Environment Around Buildings
Authors: Guo Chun Mei , Bai Ying Shuang , Li Wei
Published: June 2014

The wind environment of a district is calculated and analyzed with numerical simulation by CFD software Fluent. It analyzed concretely the air flow pattern around buildings and velocity profile, in order to provide a theoretical basis for the utilization of buildings wind power.
Evaluation of the Economics of Wind Heating in Facilitating Wind Power Integration in China
Authors: Wang Cai Xia , Li Qiong Hui
Published: June 2014

Utilization of the otherwise curtailed wind to produce heat is considered an effective solution to combating wind curtailment. This paper studies the economics of wind heating in facilitating wind power integration in China. The operation mode of wind-heating is presented. Factors that impact the economics of wind heating are identified. Economics of wind heating is then analyzed both mathematically and with a case study. Results show that wind-heating helps integrate more wind in the system, but the capital cost of heating station hardly makes the project economically viable. Reducing the capital cost of the project by subsidies can be a good solution for the problem.
Optimum Dispatching of Wind Farm Turbines Based on DFIGs
Authors: Du Xiao , Dai Zhi Qiang , Liu Huan , Wei Si Ming , Zhang Yi Gong , Liu Jin
Published: June 2014

With the development of concentrated wind power areas, new energy’s dispatching problems are more prominent with its fast expansion. However, we can maximize the utilization of wind power under power curtailment conditions by optimal wind power dispatching. The paper studies on the basic theories of wind power turbines, and analyses the power’s control and output characteristics of wind turbine. By studying the unit commitment of wind turbines, this paper provides a strategy for optimal dispatch in wind power generation. The calculation results show that the total active and reactive power output of the wind farm match the request of dispatch center. And the total active loss and total reactive loss is the least in the meantime.
Prediction of the Wind Power Installed Capacity in China Based on the Gray Theory
Authors: Lin Liu , Zheng Wang
Published: June 2014

This article carries out the selection and verification of the prediction method by learning from the EU’s data and development experience on the basis of the comparative and analytic research of the industry development in China and the EU, and puts forward the installed capacity prediction of wind power in the near and mid-term in China based on the model of DGM (2,1), in order to provide an reference for the orderly and healthy development for China’s wind power industry.
Improved Golden Section Application in Maximum Power Point Tracking of Photovoltaic Power Generation
Authors: Du Wei , Han Wei , Tan You Fei
Published: June 2014

In order to increase the output power of the photovoltaic system, the maximum power point tracking is needed. As the starting point of research in the output nonlinear characteristics, analysis of the advantages and disadvantages of the conventional algorithm and have the poor dynamic and steady-state performance of the maximum power point tracking(MPPT), the improvement method of golden section(IGSS) is applied to the photovoltaic power generation system. The results indicate that the method can quickly track the maximum power point of photovoltaic cells.
Wind Power Combination Forecasting Model Based on Drift
Authors: Lyu Quan Cheng , Liu Wen Ying , Zhu Dan Dan , Wang Wei Zhou , Han Xu Shan , Liu Fu Chao
Published: June 2014

As different wind power forecasting methods provide different information and differ in forecast precision, the combined wind power forecasting model is employed to better forecast wind power. Wind power combination forecasting model based on drift and complementarity of different single wind power forecasting models is proposed in this paper. The combination forecasting model provides a new solution to wind power forecast. Finally a practical example is given to show that wind power combination forecasting model based on drift can improve forecasting precision and is effective in practice.
Bi-Objective Short-Term Operation Model for Wind Power Penetrated System
Authors: Zhang Hai Feng , Zhang Zhao Jun , Zhou Jun , Yang Yuan Chao
Published: June 2014

In view of the uncertainty and intermittency of wind power, this paper presents a bi-objective short-term operation model to manage wind-thermal power systems. This model takes into account both the offer cost and emission. Wind power is regarded as a random variable and is assumed to follow the beta distribution. The bi-objective particle swarm optimization (BOPSO) approach is applied to solve the bi-objective model and Pareto front is obtained. The model and the solution method are tested on a generic system. The validity of the model and the method has been approved.
Optimization Method of Reactive Power Generation in Wind Plant Based on DE Algorithm
Authors: Sun Peng , Luo Ming Wu , Sun Chao Xia
Published: June 2014

Reactive power optimization scheduling problem of wind plant including capacitor and fan is researched in this paper. According to the structure of the wind plant to set different scenarios , aiming at minimizing the reactive power loss , establish the reactive power optimization mathematical model of the wind plant, calculate the optimal reactive power of wind turbine in different positions , minimize the reactive power loss inside wind plant under the constraints of the offset range of node voltage and the reactive power demand of grid. Through the analysis of examples,clear whether a reasonable reactive scheduling scheme can be getted, and present the optimization result . Keywords: Wind plant,Reactive power optimization scheduling,DE algorithm
Summary about Optimal Power Flow of Power System with Wind Farm Iteration
Authors: Wang Qian , Shen Xue , Li Ran
Published: June 2014

Integrated wind farms exert a growing influence in the economic operation of power system. Wind power is a form of intermittent and random energy. This paper introduces a model including the error in wind power forecasts using a probability or relative frequency histogram. Compared with the deterministic OPF, the proposed model allows the coordination of wind andthermal power while accounting for the expected penalty cost for not using all available wind power and the expected cost of calling up power reserves because of wind power shortage.Simulation results are presented for cases where the forecasting error histogram is eitherderived from historical data or estimated by a bimodal normal distribution.
Discussion of Doubly-Fed Wind Turbines Technical Solutions on High Voltage Ride-Through
Authors: Chang Jing , Huang Jia Dong , Chen Liang , Zhang Zi Yang
Published: June 2014

Aiming at the problem appears in recent years, which is caused by the grid voltage swell, this paper analyzed the reasons for the voltage swell and its harm of the voltage swell to doubly-fed wind turbine. According to the derivation of doubly-fed wind turbine’s transient process when voltage swells, the paper proposed several technical solutions of high voltage ride-through (HVRT) to improve the HVRT capability of doubly-fed wind turbine.
Three Phase Short Circuit Current Evaluation of Induction Generator for Wind Turbine in Distribution Network
Authors: Li Tao , Dai Zhi Yong , Luo Ai Qing , Pan Shu , Xiong Xi Cong , Zhou Nian Cheng
Published: June 2014

The transient characteristics of induction generator (IG) were investigated in the paper, and the analytic formula of its stator current under three-phase short circuit in distribution network was derived. According to the change law of IG rotor speed under the grid fault, an evaluation method to determine the current peak of three-phase short circuit for induction generator in distribution grid is proposed. The correctness of the proposed method was verified by the fifth electromagnetic transient model of IG in PSCAD/EMTDC simulation software.
The Influence and Countermeasures Research of Large-Scale Distributed Photovoltaic Access to the Distribution Network
Authors: Zhang Jing Chao , Wang Zheng Gang , Zhou Feng Zhen , Song Ning Xi , Wang Qian
Published: June 2014

In recent years, with the gradual depletion of traditional energy, as renewable energy representatives, new energy has developed rapidly. We know that distributed photovoltaic power generation with clean, pollution-free, easy installation, and therefore has been rapid development. However, the large number of distributed photovoltaic power generation connected to the distribution network would have a negative impact on the grid with a safe and reliable operation because of its randomness and volatility intrinsic properties. In this paper, in terms of power flow, voltage distribution, load characteristics, power quality, system protection and reliability departure, through MATLAB simulation analysis, the distribution network transformation strategies of primary and secondary devices has been proposed. It laid an important foundation for renewable energy development and the Third Industrial Revolution.
Transient Analyses of Passive Residual Heat Removal System of 10MW Molten Salt Reactor Experiment
Authors: Zhao Hang Bin , Yan Chang Qi , Sun Li Cheng , Zhao Kai Bin
Published: June 2014

In order to improve the inherent safety of the Molten Salt Reactor (MSR), a concept of passive residual heat removal system (PRHRS) for the 10MW Molten Salt Reactor Experiment (MSRE) was put forward. Its transient characteristics were investigated by developing a model of it using C++ code. The effects of environmental temperature, finned tube number and chimney height on the PRHRS were analyzed. The results show that the PRHRS can remove the decay heat timely. Three natural circulations are established in the PRHRS when it begins to operate. With the decay heat power reducing, the PRHRS can automatically adjust its heat removal ability. It needs not any external power for the PRHRS to operate, which enhances the inherent safety and reliability of the reactor, especially under the condition that power plants lose power.
Static Neutronics Analyses of Hellium-Cooled Solid Breeder Blanket
Authors: Li Jun Heng , Huang Rong Hua , Cao Hao Ran
Published: June 2014

A Monte Carlo N-particle transport code was used to study physics of the helium-cooled solid-breeder tritium breeding blanket in the Chinese Fusion Engineering Thermal Reactor （CFETR）for various volume ratio of the neutron multiplier and tritium breeder and various thickness of the first wall. A sandwich-type of Be and loading model is used to analyze the compact of volume ratio and the thickness of the first wall for the tritium breeding rate. The results of different volume ratio models show that the tritium breeding ratio would reach 1.51 for volume ratio from 2 to 5.And the results of the different first wall thickness show that the upper limit of the thickness should be 33mm to keep the tritium self-sustain.
ORC-Based Low-Temperature Geothermal Power Generation System
Authors: Hu Bing , Cao Yuan Shu , Ma Wei Bin
Published: June 2014

Based on the Organic Rankine Cycle，a low-temperature geothermal power generation were studied with R245fa as the working fluids ．Effects of hot water temperature,heat flux and heat-transfer temperature difference on overall heat-transfer coefficients 、net power and input heat were analyzed in detail．These results would provide a basis for the design of geothermal power generation．In addition，it would provide comparative data for the numerical simulation of heat ＆mass transfer study．
Drilling and Completion Techniques for High-Temperature Geothermal Wells
Authors: Xu Jia Nian
Published: June 2014

The high temperature formation, strong abrasiveness, numerous fractures and caves are the main problems of high temperature geothermal well drilling, cementing. Cone bit teeth repeated impact tests show that bit life mainly affected by tooth shape, materials, solid tooth technology. Setting special materials around the teeth and adjusting the fitting wring will improve the life of cone bit teeth. Study of quartz sand amount and fineness ratio effect on cement high temperature compressive strength, permeability show that optimization of high temperature cement slurry can improve the high temperature leakage zone cementing sealing and long-term effectiveness.
Simulation Analysis of Primary Energy Ratio for Air-Source Gas Engine-Driven Heat Pump
Authors: Ren Xiao Feng , Zhao Shu Xing , Wang Zhi Chao , Zhou Yi Tao , Zhang Ying Jie
Published: June 2014

Based on the simulation of the air conditioning construction dynamic load and simulation calculation of air-source gas engine-driven heat pump (GEHP), the air-source GEHP air conditioning in winter, summer and the annual primary energy ratio are analyzed in simulation with the combination of a hotel building in Tianjin. Firstly, DeST software is used to simulate all-year hourly air conditioning load of the building. Then air-source GEHP simulation model [1] is used to calculate the annual hourly gas consumption and the amount of GEHP's gas consumption in winter, summer and a total year afterwards can be got. At the same time, by the analysis of waste heat recovery of gas engine-driven, primary energy ratio for air-source GEHP in Tianjin is given under the different waste heat recovery of winter, summer and the annual.
The Contrast Experimental Study of Sewage Source Heat Pump System and Ground Source Heat Pump System in Hot Summer and Cold Winter Area
Authors: Liu Zhen Zhao , Song Bo , Hu Ying Ning , Hu Shan Shan
Published: June 2014

For two practical engineering case in a University in Guilin, this paper mainly introduces the performance of sewage-source heat pump and ground source heat pump and compare the running status in two kinds of system. The studies have shown that the sewage source heat pump unit COP at about 3.9, the system COP at about 3.3, ground source heat pump unit COP at about 4.5, the system COP at about 3.4.
The Research on New Utilization Technology of Waste Steam from Autoclave Kettle
Authors: Gu Zhi Pan , Jiang Yuan Hai , Zhou Xiang Jiang , Liu Jing , Wu Xiao Yan
Published: June 2014

This paper has studied using steam injector to recycle waste steam emission from autoclave kettle and it will produce great economic benefits and environmental benefits. Autoclave kettle which is a kind of resistance to high temperature high pressure steam curing equipment, and it’s mainly used for pipe pile, lime-sand brick and aerated concrete production. We will get more technical and economic benefits, if the research results can be popularized and applied in the national building materials products production.
Simulation and Evaluation of China’s Natural Gas Resource Security Evolution Trajectory Based on PSR Model
Authors: Guo Ming Jing , Li Wen Jie , Wang Wen Shan
Published: June 2014

Natural gas is an important energy of national economy, and its security is tightly connected with industrialization process. A comprehensive security evaluation index system, including three first class indicators, eight second class indicators and twelve third class indicators, was created based on the pressure-state-response (PSR) model. Grey correlation analysis was adopted when calculating index correlation coefficient and entropy method to obtain the weight. By studying the data of China’s natural gas from 2001 to 2013, a comprehensive security index of China’s natural gas was got. The results showed that the comprehensive security index of China’s natural gas rose from its low point. The security pressure state of China’s natural gas was improved, the security state varied greatly, and the response state continued to rise. The overall situation of China’s natural gas security was not stable.
Control Technology Research on Low-NOx Combustion System in Large-Scale Coal-Fired Power Plants
Authors: Li Jun , Li Wei Wei
Published: June 2014

The mechanism of NOx formation in coal combustion, NOx control methods and key DeNOx technologies is to be introduced. Denitrification is very significant for saving energy and carbon sources. By analysis of NOx production mechanism, the principles of controlling NOx production and lowering emission of NOx by classified combustion are described. Combined with actual operation, low-NOx combustion rehabilitation programs and relevant test to be done is to be proposed. The actual operation of the unit achieved good results after the transformation, provide a reference for similar units.
Study on LiBr-H2O Absorption Refrigeration System with Integral Storage
Authors: Yang Qi Chao
Published: June 2014

The absorption thermal energy storage (TES) system stores the energy in the form of potential energy of solution and is a promising technology for efficient energy transformation process. The performance of the absorption refrigeration system with integral storage for cooling applications using LiBr-H2O as working pair under the condition without crystallization was analyzed on the basis of the first law of thermodynamics. Simulation was employed to determine the coefficient of performance (COP) and energy storage density (ESD) of the absorption TES system under different conditions such as the absorption temperature and storage temperature. The results show that the COP of the system is 0.7453 and ESD is 169.853 MJ/m3 under typical operation conditions in summer. A low absorption temperature yields both a higher COP and ESD. The solution heat exchanger could improve the COP of the system while has no effect on ESD. Results also showed that system has a good advantage when compared to other storage methods since it is do no need thermal insulation. The absorption TES may be considered as one of the promising thermal energy storage methods.
Analysis of Combined Ground-Source Heat Pump and Water Energy Storage System and its Economic Impact Factors
Authors: Wu Xiao Ting , Kong Ling Xia , Guo Chun Mei , Hu Bin
Published: June 2014

This paper makes an introduction of the working principle and the technical and economic benefits of the combined ground-source heat pump and water energy storage system. And then according to the characteristic of this system itself and its mode of operation, we can point out that the energy storage rate, the local policy of electricity price and the strategy of operation are the main factors which influent the economic characteristics of the system. Using the initial investment and the operation cost of the system as the economy evaluation index, we respectively analyze the influence of the above factors on the index. And wish the results of the analysis can provide reference on the design of this new type air-conditioning system.
Model Identification of Power Lithium-Ion Battery Based on Laplace Transform
Authors: Hou En Guang , Qiao Xin , Liu Guang Min
Published: June 2014

In allusion to nonlinear characteristic of power lithium-ion battery, presented a method for identifying of power lithium-ion battery based on Laplace transform. First, analyzed the characteristics of the equivalent circuit model of power lithium-ion battery, determined the model of second-order RC equivalent circuit; Second, established equation of second-order RC equivalent circuit and conducted a Laplace transform; Third,using the massive data of charge-discharge test,model parameters was identified by least-squares method; Simulation results show that the method can effectively identify the equivalent model parameters, and model parameters small error.
Design Solution of Micro-Grid Power Supply System in Campus
Authors: Kuang Hong Hai , Li Sheng Qing , Li Jun Jun , Yi Ji Liang
Published: June 2014

The micro-grid power supply scheme in campus based on the grid-connected solar energy PV power generation system is designed in this paper. This system mainly consists of solar power, diesel generation, it will can be incorporated into the local grid after it has been built. This results show that using this scheme can improve the reliability of power supply system in campus and reduce the cost.
An Improved Prediction Method of SOC Based on the GA-RBF Neural Network
Authors: Liang Meng Di , Wu Tie Zhou
Published: June 2014

Concerning the prediction problems’accuracy of the state-of-charge(SOC) of the battery，this paper proposes a prediction method based on an improved genetic algorithm-radial basis function neural network for power battery charged state. The prediction method, based on intensity of information interaction and neural activity, adjusts the size of the neural network online and solves the problem that radial basis function neural network structure adjustment influences the accuracy of charged state prediction. The simulation results show that，compared with the method of radial basis function neural network based on genetic algorithm , the accuracy of charged state prediction is more stable and more precise.
Influence of Ignition Timings and EGR on Performance and Emissions of a Spark-Ignition Methanol Engine with High Compression Ratio
Authors: Xie Fang Xi , Wang Qing Nian , Li Xiao Ping , Su Yan , Hong Wei
Published: June 2014

Influences of the ignition timings and EGR rate on performance and emissions characteristics of a spark-ignition methanol engine with higher compression rate have been researched experimentally. The methanol engine was obtained by retrofitting a direct injection diesel engine whose compression ratio was 18.0 and the methanol injectors have been mounted in intake manifolds. The experimental results have revealed that, the advanced ignition timing can increse peak in-cylinder pressure and shorten combustion duration period. The increased EGR rate can reduce peak in-cylinder pressure, lengthen combustion duration. The methanol engine has optimal EGR rate and ignition timings to obtain good performance and low exhaust emissions. The best compromise between the BSFC and exhaust emissions is reached at optimal EGR rate and ignition timings.
Comparative Study on Energy Consumption of Gas-Fired Infrared Radiant and Convection Heating
Authors: Han Yan Min , Li Zheng Wei , Xu Peng
Published: June 2014

Energy consumption of gas-fired infrared radiant and heat exchanger by convection heating is comparative analyzed, CFD software is used to simulate fields of the temperature and the predicted percentage of dissatisfied. Based on the profiles analysis of comfort index, it is found that the radiant panel can save over 10% than convection heating when implemented in industrial factory building.
Increase of Energy Efficiency for Educational Institution Building
Authors: Vatin Nikolay , Nemova Darya Viktorovna , Tarasova Darya Sergeevna , Staritcyna Anastasiia Andreevna
Published: June 2014

The analysis of results of power inspections and search of possible solutions of energy saving and increase of power efficiency of budgetary organizations (kindergartens) taking into account feature of these objects and justification of their economic efficiency is given in article.
Simulation of the Bombardment to the Intrinsic Thin Layer of a-Si:H by Plasmas in the Hit Solar Cell
Authors: Hu De Zhi , Wu Jin Shun , Peng Tao
Published: June 2014

In the paper, the discharge process of double frequency capacitive coupled Plasma in argon gas has been investigated by one dimensional PIC/MCC method. The result shows that the rf voltage in fluence the density and Potential deeply. Furthermore, the effect of various driven voltage on ion energy distribution (IED) and ion angle distribution (IAD) at the electrode is studied. It is found that when the driven voltage grows, the Peak of energy increases. At the same time, the high energy ions distribution increase clearly too. The content of bombardment to the intrinsic thin layer of a-Si:H is analyzed in the condition of various driven voltage. The critical driven voltage is calculated, which can keep the plasma discharge process and not erode the intrinsic thin layer in the HIT solar cell.
Optimum Siting and Sizing of Distributed Energy Resources Taking into Consideration Hourly Operating Strategies
Authors: Ren Hong Bo , Wu Qiong , Yang Jian , Ban Yin Yin
Published: June 2014

In this paper, a distributed energy resource (DER) system plan and evaluation model is extended to include the design of district heating network. In the model, production and consumption of electric power and heat, power transmissions, transport of fuels to the production plants, transport of water in the district heating pipelines and storage of heat are taken into account. The problem is formulated as a mixed integer linear programming (MILP) model where the objective is to minimize the overall cost of the DER system. The solution gives the DER structure, i.e., which production units, heat transport lines and storages should be built as well as their locations, together with design parameters for plants and pipelines.
Researching on the Energy-Saving Technology of the Feedback Energy Driven Diesel Electric Set
Authors: Chen Xu
Published: June 2014

Feedback energy recycling is one of the most important energy-saving technologies of diesel generator sets. The current methods of recovering feedback energy are mainly by the energy storage device. However, this method has disadvantages such as the big cost and large area of space. In order to improve the efficiency of feedback energy recycling, the use of feedback energy saving diesel generator set is an effective solution. By improving diesel generator set control system algorithm and ensuring the safety of diesel generator sets, the feedback energy can drive diesel generators running. After the actual verification, this solution is correct, the improved algorithm is effective and the energy-saving effect significantly.
The Research of Power Generating Self-Optimization Mode Based on the Objective Function Optimization
Authors: Hua Zhi Gang , Hu Guang Yu , Wu Zhi Gong , Zhai Yong Jie
Published: June 2014

The self-optimization method for power generation proposed in this paper is an initial allocation of power energy. Every unit is according to the same principles of utilization hours in the same province. Under the premise of unchanged total power of each power generation unit and the security of the power system as well as the discharge standards, this method can achieve the minimum social resource consumption and the minimum discharge meet the demand of power energy at the same time by adjusting of autonomy optimization among internal different units. It is an important means and effective way to carry out energy generation scheduling work.