bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigating the Impact of Pulsed Load on Different Isolated Power Systems
Authors: Xia Li , Wang Xin Zhi , Zhang Chao
Published: August 2013

Pulsed power load system releases large energy after short charging time,and has considerable influence on power quality of Isolated Power System (IPS). This paper builds two kinds of IPS models, pulsed power loads and energy storage module (ESM) in PSCADTM. The impact of pulsed power loads with different rated power on IPS is examined. It is also shown that the ESM and propulsion system can be used to further reduce the impact of pulsed power load on IPS.
Damping Analysis of Subsynchronous Oscillation Caused by HVDC
Authors: Xiao Shi Wu , Shu Lan Lan
Published: August 2013

High Voltage Direct Current transmission (HVDC) will cause torsional interaction under certain conditions. Among a variety of factors, improper rectifier control has fateful effect. In the paper, the test signal method which is the time-domain form of the complex torque coefficient approach (CTC approach) is studied. Its application conditions in multi-machine systems are summarized. Using the test signal method, impacts of DC power, DC voltage, rectifier controller parameters and generator output on electrical damping characteristics in the Suizhong system are studied based on time-domain simulation model.
Prototype Test for Confirming the Concept of HTS Magnetically Controlled Saturable Reactor
Authors: Dong Hong Da , Ren Li , Xu Ying , Tang Yue Jin , Song Meng , Wang Da Da , Cao Kun Nan
Published: August 2013

With the development of high voltage long distance transmission and expansion of the grid, the reactive power compensation device with excellent adjustment function becomes more and more important. This paper aims to study a high temperature superconducting magnetically controlled saturable reactor (HTS MCSR), which has a wide range of stepless reactive power capacity adjustment and little operating loss. An adjustable reactor topology of three split limbs core was proposed. Based on research of structure and theory, the operating characteristic was obtained. A normal conductive prototype was manufactured. Simulation and test were done to verify the adjustment characteristic of this reactor. The results confirm the concept and provide an experimental basis for developing HTS MCSR in the future.
Chaos Synchronization Control of an Indirect Field-Oriented Induction Motor
Authors: Wang Dong Dong , Lu Yi Min
Published: August 2013

Chaos is extremely sensitive to initial conditions, which makes the system with even smaller initial amount of changes can eventually evolve into a very different result. In an indirect field-oriented control of induction motor drive when estimated errors exist, within a certain range of parameters the system may evolve into chaotic motion through period-doubling bifurcation. In this paper an adaptive controller for synchronizing two indirect field-oriented induction motor drives under chaotic state is presented. Simulation results show that with the state-error feedback controller, synchronous state may be achieved rapidly and robustly.
Design of Eddy Current Retarder Generator/Starter Integrated System
Authors: Liu Cun Xiang , He Ren , Liu Xue Jun , Zhang Er Li
Published: August 2013

The eddy current retarder generator / starter integrated system is a vehicle intelligent system which can be used as vehicle starter, power generation. The system can reduce the energy consumption of the car, extends battery life, and improves the stability of the brake system.
Analysis for Impacts of Internal Impedance on the Load Characteristic of a Permanent Magnet Synchronous Generator
Authors: Shen Yue , Zhang Ling Tan , Sheng Li Min , Li Lin
Published: August 2013

The load characteristic analysis of permanent magnet synchronous generator is presented. An internal impedance mathematic model of the generator was built with phasor analysis method for analyzing the relationship between exterior voltage characteristic or voltage regulation rate, active power and armature reactance. The research results demonstrated that the internal impedance of generator has both current and power factor angle negative feedback characteristic, which makes the voltage regulation rate be improved to a certain extent and the improved effect lying on both the direct-axis armature reactance under condition of an inductive load and the quadrature-axis armature reactance under resistive load. Additionally, an optimal range of the armature reactance being of less voltage regulation rate was determined according to numerical calculation and analysis. An experimental result based on the experimental measurement and data analysis of exterior voltage characteristic corresponds to the theoretical calculation demonstrated the correctness of the research model based upon the armature reaction analysis. Those can provide the theoretically guidance to the electromagnetic design of permanent magnet generator.
Numerical Simulation of Effects of Gravity on the Micro Jet Flame in the Confined Space
Authors: Gan Yun Hua , Luo Yan Lai
Published: August 2013

A microscale ceramic tube was used as a burner jet, and a coaxial jet flame was established in the confined space between the ceramic tube and the outer quartz glass tube. The effects of gravity on the small jet flame characteristics in the confined space were investigated numerically. Comparisons between the experimental data and the numerical data showed that characteristics of the small jet flame structure and temperature field were in good agreement. It verified the accuracy of the numerical simulation. Numerical simulations of flame characteristics at zero gravity level were performed. The results show that the gravity level has a greater influence on the flame width than that on the flame length. The chemical reaction rate is larger under the condition of normal gravity than that of zero gravity.
A Framework for Business Model Generation and Economic Analysis of Smart Grid Hub
Authors: Shin Kwang Sup , Hur Won Chang , Kim Woo Je , Moon Yong Ma
Published: August 2013

This paper provides a framework for smart grid hub. Unlike previous studies exploiting technological challenges, our framework presents the whole steps to construct a smart grid hub, plan operations and develop a business model, and then methodologies to validate the models for each stakeholder.
A Research on Suppression of SSO Based on the Real Time Digital Simulation
Authors: Guo Chun Lin , Xu Jian Ting , Zhao Yang , Xiao Xiang Ning
Published: August 2013

According to the first project using SVC to mitigate SSO in China, this paper builds the system model based on real time digtal simulator,and gives an introduction to the sysem model. Under typical operation mode and fault conditions,the performance of SVC is fully validated,it also analysis and comparise the performance of SVC under different operation modes. Simulation results show that the SVC can mitigate the SSO phenomenon.
The Effect of Wind Speed on Cooling Tower Plume Dispersion
Authors: Guo Rui Ping , Yang Chun Lin , Zhang Chun Ming
Published: August 2013

Wind speed was an important impact factor when simulating the cooling tower plume dispersion. The SACTI model was selected in this paper and this model was used to predict the plume dispersion character discharging from cooling tower under normal operation and three different kinds of wind speeds. The three kinds of wind speeds were 2 m/s, 4 m/s and 6 m/s and it was analyzed that the plume character under these three wind speeds. Results showed that the plume length, plume height and plume radius will present different change trend when wind speed changed.
Study on Thermal Model of Operation in Steady for Hot Pipe
Authors: Xu Ying , Dai Zhong Hua , Liu Xiao Yan
Published: August 2013

for hot pipeline, on the base of taking the influence from the constant temperature of the earths layer and air cyclic variation in year into account, the thermal calculation mathematics models of steady operation in different laying way were established and the test method was introduced, which were verified to be right by the temperature at inlet and outlet of heating stations. Bing compared experiment data with test data, all the errors were less than 3%, which can meet the demand of project and it verified the models to be right.
Simulation and Experimental Research on Screw Ground Source Heat Pump Unit
Authors: Wang Qiang , Ding Zhao Lei , Wang Hai Yun , Lv Wen Chao
Published: August 2013

A grey box model of screw ground source heat pump unit has been established and operating characteristics of the unit using R22 refrigerants were simulated. The effects on refrigerating capacity, heating capacity, power consumption of the compressor and COP on conditions of cooling and heating have been analyzed with different inlet water temperature of evaporator and inlet water temperature of condenser. Results show that main factor which affecting COP of heat pump unit is inlet water temperature of condenser. The change of refrigerating capacity and heating capacity are mainly caused by inlet water temperature of evaporator. Measures can be done to decrease the inlet water temperature of condenser when the unit operates for a long time and to increase inlet water temperature of evaporator on very hot or very cold conditions.
Experimental and Numerical Study on Diluted Premixed Laminar Dimethyl Ether-Air Flames
Authors: Chen Zhao Yang , Tang Chong Long
Published: August 2013

Effects of diluents on premixed laminar dimethyl ether (DME)/air flames were studied experimentally and numerically. The results show that measurements and predictions in laminar burning velocities are in reasonably good agreement. Laminar flame speeds of DME mixtures decrease with the increase of dilution ratio. For a specific diluent ratio, suppression effect of diluent decreases in the order of carbon dioxide, nitrogen and argon. Influences of argon and nitrogen are mainly due to the increase of specific heat of the non-fuel gases in the mixture, and that of carbon dioxide is resulted from the combination effect of dilution and direct reaction. CO2 participating reaction, CO+OHCO2+H, competes for H radical in the chain branching reaction H+O2 O+OH. This competition decreases concentration of the radicals like H, O and OH, leading to a significant reduction in laminar burning velocity.
Working Fluid Selection for an Organic Rankine Cycle for Waste Heat Recovery under Different Heat Source Temperatures
Authors: Yang Shuang , Zhang Bing , Xu Jin Liang , Zhang Wei , Wang Chao Xian
Published: August 2013

Optimum working conditions of 11 working fluids under different heat source temperatures in an organic Rankine cycle were systematically investigated. Cycle efficiency of each fluid was compared at their optimal operating conditions were then analyzed. R141b appears to be the best choice when the heat source temperature is around 200oC. Heptane is suggested the suitable working fluids for the ORC system when the heat source is 300oC.
Modeling of the Coal-Fired Utility Boiler in a Thermal Power Plant Based on Macro Energy Balance
Authors: Yu Tong , Yuan Jing Qi
Published: August 2013

A modeling method of the coal-fired utility boiler for a 300MW thermal power plant based on energy balance is presented. Key work sections of the power plant are treated as lumped parameter systems and a first-order model with time delay is used to describe the dynamic characteristic of the entire system. As model validation, comparison between model simulations and the actual process data for the energy of the main steam and hot reheated steam is given. Basically, the model is found to be able to track the output power variations of the boiler under different operation conditions. Rolling parameter identification of the model may further improve the model accuracy.
Thermal Parameter Optimization of Waste Heat Power Generation System that Used in a Float Method Glass Klin
Authors: Chen Guang Hui , Cheng Jin Ming , Miao Chang Hai
Published: August 2013

Based on the parameters of flue gas in a float glass klin we designed and discussed the thermal parameters of its waste heat power generation system. According to the thermal equilibrium calculated data that based on the internationally accepted water and steam thermodynamic properties formula IAPWS-IF97. Respectively regarded the lowest exhaust gas temperature and the maximum generating capacity as the final targets. We analyzed the two designs. Finally we got the conclusion that we should take the maximum generating capacity as the goal.
Influence of Dynamic Characteristics of Wheels between Vehicle with Traditional and Articulated Bogie
Authors: Yuan Hao Shan
Published: August 2013

The wheel-rail combined power spectrum densities are transformed into time domain samples by IFFT method, and add abnormal corrugation samples. The samples were taken as the inputting disturbances of a vehicle-track vertical coupling dynamics model, and the interaction force of wheel/rail is calculated by the models of vehicle with traditional bogie frame and articulated frame of vehicle/track coupling system. Dynamic responses of wheels on corrugation track can be calculated. The results show that wheels vibration intensity of vehicle with articulated bogie is lower.
Numerical Analysis on Solid-Liquid Phase Change Heat Transfer Process between PCM and FCPCM
Authors: Sheng Qiang , Xing Yu Ming
Published: August 2013

Due to enthalpy-porosity technique, mathematical models of phase change material (PCM) and foam composite phase change material (FCPCM) in two-dimensional rectangular canister were established in the conditions of gravity and natural convection. It solved phase change problems by the enthalpy method coming from computational fluid dynamics. The numerical results show good agreement with reference findings. The numerical comparison between PCM and FCPCM verifies that metal foam can not only enhance the thermal conductivity of the PCMs but also improve the thermal performance of the heat storage system.
Experimental Analysis of FWX Series Cyclone-Static Micro-Bubble Flotation Column
Authors: Dai Bao Qing , Li Wei , Ma Chang Qing , Shao Yuan Yuan , Geng Kai He
Published: August 2013

This thesis introduces the working principle and structure of FWX series cyclone-static micro-bubble flotation column. It makes industrial test results analysis of the FWX series cyclone-static micro-bubble flotation column adopted by a gold mine, and come at valuable conclusions on the process design and equipment optimization through the analysis of experimental data.
Numerical Simulation on Water Mist Fire Suppression System Operation in Typical Environment
Authors: Liu Peng
Published: August 2013

Water mist fire suppression system is widely used in many places, for its little damage and greatly reduces the cost of extinguishing fire. But because of the intricate extinguishing mechanism of water mist, it is difficult to design an optimal water mist fire suppression system in a typical place. With the rapid development of computer technology, computational fluid dynamics (CFD) has already been proved to be a useful and powerful tool in fire safety science. Fire Dynamics Simulator (FDS) is used to simulated the interaction of water mist and fire in a typical fire scenario in this paper. Two design schemes of water mist system are compared to prove which one is better. Through simulated by FDS on these two cases, the water mist system with 4 sprinklers is suited in the restroom.
The Research of Anti-Slip Control for Slurry Pump Based on PLC
Authors: Zhao Xue Song , Hu Jian , Shi Pei Cheng
Published: August 2013

The research of anti-slip control for slurry pump is to prevent the cavitation of pump,protect flow passage components of pump from cavitation corrosion.Through the analysis,the size of the inlet velocity is regarded as the characterization whether pump cavitation.Calculate the five kinds of inlet velocity when the slurry pump is in the normal work, make the procedure is versatility. PLC programs are compiled and imported into hydraulic-pneumatic experimental platform,experimental platform simulates the results of pump system is accord with anti-slip control requirements.The program is used in slurry pump avoids the occurrence of cavitation phenomenon and simplifies the complicated site operation.
Application and Economic Analyses of Ice Storage Air Conditioner in a Holiday Plaza of Shenzhen
Authors: Zhang Xu , Ma Kunru , Zhang Xiao Ting
Published: August 2013

Introduce the principle and advantage of ice storage air conditioner. Take an project in Shenzhen for example, analyze it’s circulate mode and compared the cost of ice storage air conditioner with routine air conditioner at the same load. The results show that the project should adopt ice storage air condition and this is economically rational.
A Nonlinear Lumped-Parameter Dynamic Model of Power Plant Boiler Superheater
Authors: Kang Ying Wei , Xue Yang , Huang Wei , Li Yi Fan
Published: August 2013

Traditional models of power plant boiler superheater are incapable of simulating the operating conditions under large disturbances with high precision. To resolve this challenging problem, this paper presents a nonlinear lumped-parameter dynamic model of power plant boiler superheater. The present model describes the dynamic processes of the pressure-flowrate and the enthalpy-temperature channels with sufficient consideration of their coupling effect. To better capture the distributed-parameter property of superheater temperature, the multi-segment lumped-parameter modeling method is employed for modeling the enthalpy-temperature channel. Dynamic responses of the last-stage superheater of a 600 MW controlled circulation boiler to disturbances of the spray water flowrate, the superheater inlet enthalpy, and the absorbed heat flux are simulated. Simulation results show that dynamic responses of the present model are reasonable, and the model has high precision, which can meet the requirements for full scale simulation and control system simulation.
Multiple Criteria Decision Method Used in Selection of Green Air-Conditioning System
Authors: Zhou Can , Li Yu Yun
Published: August 2013

Established a hierarchy structure model and made a quantitative assessment of seven air-conditioning systems which are gas boiler plus electric refrigerating system、air-cooled heat pump、variable refrigerant volume air conditioning、ground-source heat pump air conditioning、centralized heat-supply plus electric refrigerating、gas direct-fired machine、energy storage on relevant professionality and indoor environment,initial investment,operating costs,operation and management,environmental impact,energy consumption.Finally we obtained an optimal scheme,which agreed with that in practice.
Performance Test on a Solar Powered Two-Stage Solid Wheel Desiccant Air Conditioning System
Authors: Zou Tong Hua , Jia Gu , Cao Fa Li , Yu Rong
Published: August 2013

In the paper, changes of both outlet temperature and relative humidity of solar powered two-stage wheel desiccant air conditioning system are tested with time under the typical Tianjin summer condition. It is found that supply air temperature of the solar driven desiccant cooling system could steady below 21 degrees Celsius, and the relative humidity of it is more than sixty percent in most of time of the actual operation. When operating, the thermal coefficient of performance of the whole air conditioning unit is about 0.5, and the reliability of two-stage wheel desiccant air conditioning system is verified.
A Distributed Protection and Control Scheme for Distribution Network with DG
Authors: Tong Bing Bing , Zou Gui Bin , Shi Ming Lei
Published: August 2013

High penetration level of distributed generation (DG) connected to distribution network makes the protection and control in the traditional distribution network face great difficulties, so this paper proposed a protection and control technology based on advanced feeder terminal unit (AFTU). According to DGs capability and load, the scheme divides the distribution network into several zones in advance, each of which can operate in island mode. Circuit breakers (CB) together with AFTU are installed at the beginning of feeder, the border of two zones and the point of DG connection. AFTUs interconnect with each other through the fiber optic network. AFTU detects the local electrical quantities in real-time and exchanges information with others through the fiber optic network. It can locate the faulted zone quickly to achieve fault isolation and island operation according to local and neighboring information. The reclosing of CB and the control of reconnection of DG are also designed. The case analysis illustrates the feasibility of the proposed distributed protection and control scheme.
A New Methodology of Harmonic Detection Based on Windowed FFT and Wavelet Transform
Authors: Zheng Xu , Wang Shuo , Zhang You Bing
Published: August 2013

Traditional FFT show good trait in steady-state harmonic testing, while it turn low accuracy when testing harmonic with voltage sag or transient, and can not illustrates the information on amplitude-time plane. The discrete wavelet transform is suitable for transient harmonic signals. However it is not intuitive and has more computing than FFT. Since both steady-state and transient components exist in power system, a new method of harmonic analysis algorithm based on Kaiser windowed FFT combing with Daubechies wavelet transform is proposed. The simulation results demonstrate this method possesses high accuracy and flexibility in harmonic detection.
Modeling and Fault Analysis of VSC-HVDC Supplying Passive Network
Authors: Zhao Tian Liang , Xiao Shi Wu
Published: August 2013

VSC-HVDC (high voltage direct current based on voltage source converter) is a new HVDC transmission technology based on voltage source converter. Its converter uses thyristors with the current off capability such as IGBT or GTO. VSC-HVDC system can realize passive inverting by pulse width modulation (PWM) technique. This paper introduced the structure and the operating principle of the VSC-HVDC transmission system. In addition, we studied the mathematical model of the VSC-HVDC transmission system supplying passive network in ABC stable coordinate system and in DQ rotating coordinate system. Lastly, we built the physical model of the VSC-HVDC transmission system based on PSCAD/EMTDC simulation software. We carried on various types of fault simulation and analyzed the simulation result. The result of the paper may provide reference in the further study and application of the VSC-HVDC transmission technology in the future.
Analysis of Steam Reclaim in Cooling Tower
Authors: Liang Jing Long , Li Hui , Geng Xiao Ya
Published: August 2013

Thermal power generation in China as the main energy production, the production process consumes a lot of water resources. It is significant and the overall layout of the development of the national economy and the effective utilization of water resources, for the water consumption of the accurate calculation of thermal power generation process. The value through the site have been extracted, The water consumption of power plant cooling tower unit and the emissions per unit of energy was calculated and analyzed.
The Renovation of Noise Reduction and Ventilation for Indoor Substations
Authors: Xu Rui , Yu Ting Fang
Published: August 2013

The noise reduction and ventilation cooling is contradictory each other for urban indoor substation. Our efforts were focused on the problems of the excessive noise and poor ventilation of indoor substation in this paper, the existing shortages of the primary ventilation cooling program and the noise source characteristics of the indoor substation were analyzed, and the renovation of noise reduction and ventilation cooling was proposed. The measurement data of before and after renovation demonstrated that this renovation on noise reduction and ventilation cooling has a visible effect in meeting the national standard for noise level of the substation surrounding as well as in improving the cooling effect significantly.
An Experimental Investigation on the Heat Transfer Coefficient of Oscillating Heat Pipes
Authors: Gao Ling , Geng Wen Guang , Ma Xiao Xu , Ma Xiu Li , Luo Guang Liang , Li Xuan You
Published: August 2013

This paper presents an experimental study on total heat transfer coefficient (ht) in oscillating heat pipe heat exchanger hot air flow tunnels, ht plays an important role in the oscillating heat pipes design process. In this paper, ht and the convective heat transfer coefficient (h) was investigated by experimentally and theoretical calculation respectively. From experimental study, the relationship between the ratio of heat transfer coefficient and the relative humidity is obtained. The results show that the ratio of ht to h increases from 5 to 20 as the relative humidity of the hot gas increasing from 19.22% to 60%. According to the experimental data, a matched curve and an empirical equation were presented, which can be described as ht=h(1.87783+0.09631x+0.0032x2).
A Fast Searching Scheme for Power Flow Transferring Identification in Complex Power Grid
Authors: Gu Song Lin , Wang Zeng Ping
Published: August 2013

Power flow transferring random occurred in power grid, so how to quickly identify overload line is a key problem to prevent cascading trips. This paper according to the bus self-impedance change rate rapid search the area which possible happened power flow transferring, and through the correction method for network equations checked the lines in this area whether overload or not, then selected the overload line caused by power flow transferring. Under the condition of known initial network parameters, this scheme according to the local network parameters modified to related calculation, improves the calculation speed, and has advantages for multipoint flow transferring recognition in complex power grid. Taking the New England 10-unit 39-bus system which also used this method as the example, in this case, this method is confirmed by the BPA simulation.
Fault Analysis of 10kV Distribution System Composed by a Battery Swap Station
Authors: Zhang Ying Da , Liu Nian , Zhang Jian Hua
Published: August 2013

Battery swap stations for electric vehicles are getting more and more attention, but there is still no comprehensive protection scheme in distribution system when battery swap stations discharging to the grid. The present paper presents the structural topology and the corresponding detail control model of charge and discharge machines in the battery swap station. Then with an example of a 10kV distribution system composed by a battery swap station, the fault features of the battery swap stations outlet and the grid are simulated when the battery swap station works in different state and various short circuit faults occur in the grid through PSCAD/EMTDC. Based on the above, the impact of the battery swap stations operating status on the grids fault features is analyzed in detail. In the end, the outcomes of the paper can provide evidence for improving such distribution grids protection.
Research and Application on the Reactive Power Optimization of the Regional Grid Planning
Authors: Chen San Bo , Zhang Han , Zhang Jian
Published: August 2013

With the minimization of the annual operation cost as the objective function while meeting constraint conditions of the node voltage and the branch power factor, this article proposes a practical Reactive Power Programming method for regional power distribution network. The problem of reactive compensation planning capacity turns into the problem of constrained quadratic programming. Then the problem is solved by MATLAB Optimization Toolbox. The actual engineering examples show that the method is simple, fast, efficient, and has practical values in engineering.
Research of Load Forecasting Based on General Regression Neural Network
Authors: Wu Cheng Ming , Yao Wei Wei , Dong Wen Jing
Published: August 2013

Load forecasting technology is an important guarantee of the safe and steady operation in power system. Based on the analyzing and designing the network structure of GRNN, this paper sets an appropriate smoothing parameter and proposes a strategy for load forecasting under considering the weather factors. A short-term load forecasting model with the factors of temperature, humidity, wind speed, barometric pressure and rainfall is established. And the model can achieve the expected result after a complete test. Finally, comparing with the forecast model based on BP neural network, GRNN method shows the great superiority in power load forecasting.
The Feasible Analysis of Transformer Fast Reenergizing with Neutral Point Ungrounded
Authors: Zhao Yao , Yang Yu De , Pan Yan Hong , Qi Le
Published: August 2013

The feasibility of transformer fast reenergizing with neutral point ungrounded after the external fault being removed is analyzed in this paper. By calculating overvoltage and discriminating magnetizing inrush current, it analyzes four ways to restore power of transformer and chooses the optimal strategy which is safe and time-saving. The result shows that in the case of transformer neutral point ungrounded, closing the low-voltage circuit side breaker before the high-voltage, which can effectively limit over-voltage in a safe range. The second harmonic characteristic of magnetizing waveform may disappear, while the intermittent angle characteristics are still significant. With the help of the intermittent angle principle, transformer differential protection may not misuse. The average time for each customer interruption is reduced from 40 minutes to 10 minutes and saves an hour for engineer on the way back and forth. It will greatly improve power supply reliability.
The Realization of Induction Cooker Power Control Based on Fuzzy Control Theory
Authors: Shi Min Min , Chen Hong Bing , He Xue Hong
Published: August 2013

This paper introduces the working principle of induction cooker and analyzes the design of power control using MCU; the fuzzy control method put forward when the pans change can keep the output power stable.
Study on Recovering Carbon and Iron Concentrate from Flue Slime of Blast Furnace
Authors: Zhang Jin Xia , Chen Miao , Niu Fu Sheng , Li Li
Published: August 2013

Through the analysis and study the properties, characteristics and present conditions of the flue slime of blast furnace, a suggestion was made of recovering carbon and iron concentrate from the flue dust using a beneficiation technology consisting of magnetic separation-gravity separation-flotation. The laboratory test achieved good technical and economical results, reaching the expected effect. The technology can be applied in production and popularized.
Geological Factors Analysis of Gas Unusual Area in Southwest of Shandong Province
Authors: Meng Yan Ru , Jiang Nan , Ning Wen Feng , Zhong Chong Qiu , Gao Kun Peng , Men Yue Feng
Published: August 2013

Gas geological law in southwest of Shandong province was studied with theoretical foundation and method of gas geology in this paper. It finds that the area in southwest of Shandong province is mostly low gas mining area. But Fucun coal mine of Tengnan mining area, Sanhekou coal mine, Jinyuan coal mine, Tangkou coal mine of Jining mining area and Zhaoguan coal mine of Huanghebei mining area are all gas unusual area. Among them, Fucun coal mine, Sanhekou coal mine and Jinyuan coal mine appear high gas unusual which are mainly affected by magma intrusion, Tangkou and Zhaoguan coal mine form gas unusual area which are mainly affected by thickness of upper bedrock.
Output Work of the Electro-Generative Simultaneous Leaching for Sphalerite-MnO2 in the Presence of Acidithiobacillus ferrooxidans
Authors: Xiao Li , Chen Bin , Zhong Hui , Qiu Guan Zhou
Published: August 2013

Sphalerite was used to study both the electro-generative simultaneous leaching (EGSL) and the bio-electro-generative simultaneous leaching (BEGSL) in this paper. The Relationship between potential, work output, and current for sphalerite in presence of A. Ferrooxidans and sterile, showed that the electro-generation trend enhanced in the presence of A. ferrooxidans for sphalerite. The Evans graph for sphalerite in presence of A. ferrooxidans and sterile showed that with the increase of current, the output potential decreased. The dissolved metal ion in the presence of A. ferrooxidans is nearly 30% higher than that in the absence of A. ferrooxidans; the electro-generative quantity in the former is about 130% more than that in the latter; the transferred charge due to the bacteria is more than that of EGSL process in the last stage of BEGSL.
Study on Collector for Reverse Flotation of Certain Phosphorite in Guizhou
Authors: Li Cheng Xiu , Cheng Ren Ju , Luo Hui Hua
Published: August 2013

On the basis of the contrastive research into the flotation performance of several vegetable oil fatty acids, the rapeseed oil fatty acid with better performance was screened out from many fatty acids, and its linolenic acid C18:3content is15.81%, then through modifying and compounding, new magnesium removal collector EM-LS-01was obtained. With the use of this agent in certain low-grade high-Mg phosphorite, the phosphate concentrate indexes of single reverse flotation are grade of 30.25% P2O5, recovery of 90.63% and content of 0.99% MgO.
Study on Flotation Process of Coal Slime
Authors: Zheng Ji Hong , Xu Chu Yang , Hu Peng Fei
Published: August 2013

The froth flotation process of coal slime was studied by the flotation experiments on the coal slime of Qian yingzi, Pan yidong and Qidong coal preparation plant. The influence of coal slime properties, collector dosage, ratio of collector and frother, and pulp density on the flotation effect were studied. The experimental result showed that the coal slime with rich fine and high ash fraction was harmful to flotation. As to the coal slime of Pan yidong coal preparation plant, the flotation effect was the optimal when dosage of collector was 600 g/t, ratio of collector and frother was 15:1, and the pulp density was 100 g/L.
Study on the Bulk Flotation of a Low Grade Copper-Molybdenum Ore of Yunnan Province
Authors: Xian Yong Jun , Nie Qi , Lu Ping
Published: August 2013

Based on the analysis of the properties of the copper-molybdenum ore from Yunnan province, a suitable technical route was presented for processing of eligible molybdenum and copper concentrate with a high recovery. Moreover, the main factors i.e. grinding fineness and collector dosage, affecting the quality of roughing concentration was investigated. The optimum condition of bulk flotatuon were obtained.
Control Factors of Chang 4+5 Reservoir Properties in Jiyuan Oilfield
Authors: Zhou Qi , Yin Yan Yi
Published: August 2013

Discovered in recent years, Chang 4+5 reservoir group of Yanchang Formation in Jiyuan area is ultra-low permeability reservoir. The evaluation and prediction of the reservoir is the most critical technology in reservoir development. Comprehensive analysis with multiple research approaches shows that the storage potential of the ultra-low permeability reservoir is jointly controlled by sedimentation and diagenesis. Sedimentary factor includes lithology and sedimentary facies, two basic factors affecting the storage potential. The reservoir lithology is of fine-grained debris-arkose and miliary arkose. Pore types are mainly intergranular pores and dissolved pores. The sandstone microfacies in the delta front underwater distributary channel has the best storage potential. Diagenetic factors, including diagenesis types, evolution, intensity, combination etc., have direct influence on the reservoir storage potential. Compaction and calcite cementation are the main factors that weaken the storage potential, whereas carbonate dissolution, especially the dissolution of feldspar plays an important role in the improvement of the storage potential.
Research on the CO2 Corrosion Inhibitor Technology in Oil and Gas Fields
Authors: Cheng Yuan Peng , Li Zi Li , Bi Hai Sheng , Song Yi Xuan
Published: August 2013

CO2 corrosion is the main safety problem of production process in gathering, delivering and treating of oil and gas. Injecting inhibitors to suppress CO2 corrosion in oil and gas fields is an easy-to-use, low investment, quick solution method. The goal of this study is to summarize the already established research results of controlling CO2 corrosion, inhibition mechanism of CO2 corrosion inhibitors is reviewed, application status of inhibitor technology in CO2 corrosive environment is discussed. Research status of amides, imidazoline derivatives, quatemary ammonium salts and schiff bases overseas and domestic is highlighted. Finally, an outlook on the development trend of CO2 corrosion inhibitors is presented.
Summary and Overview of Development Technologies of Unconventional Oil and Gas Reservoir
Authors: Li Pei Zhu , Zhao Xiao Guang
Published: August 2013

Conventional reservoirs and unconventional reservoirs differ a lot in terms of accumulation mechanism, distribution, exploration evaluation method and technique. Therefore the accumulation study and exploration evaluation for unconventional reservoir are different from that of traditional reservoir. This paper presents five development techniques of unconventional oil and gas resources, their features, advantages and disadvantages and summarizes the current advanced technologies and their development trends.
The Effect of Sand Production on Formation Porosity in Unconsolidated Oil Field
Authors: Liu Xiang , Zhao Chun , Qiu Zhi Chao
Published: August 2013

Formation porosity near the wellbore can be changed by massive sand production, so it is impractical to use the initial formation porosity in downhole operation design in unconsolidated sand reservoir. The numerical method for sand prediction is limited for its complicated calculation procedures. An analytical model for porosity variation calculation is developed by coupling the material balance equation with the critical fluid drag force. With the result of sand production simulated test, the model can quantify the relation between sand production rate and formation porosity variation. Application of the model in oil field shows that it is simple and practicable for field engineering design.
The Exploration and Recognition of Stimulated Reservoir Volume for Shale Gas in Sichuan Basin - Taking Well W201 as an Example
Authors: Sang Yu , Yang Sheng Lai , Chen Hao , Zhou Feng , Qian Kun , Shi Wei
Published: August 2013

In view of the formation characteristics of the Qiongzhusi formation in Sichuan Basin and using the Stimulated Reservoir Volume (SRV) concept for reference, fracturing design of well W201 is completed and field tests are successfully conducted. Through evaluation and analysis of the sand fracturing data and by combining some practical experience of the shale gas multistage fracturing in North America, the difference between SRV in shale gas and traditional fracturing is proposed and inspirations is obtained, reference and guidelines for the development of shale gas in China are supplied.
A New Method to Determine Mud Density in Deflecting Well
Authors: Li Tian Tai , Zhang Ming , Zhang Han Lin , Tang Li Ping
Published: August 2013

Because of the inclination of borehole, there is a significant difference about the borehole stability between deflecting and vertical well. Borehole stability has a relationship with not only trajectory of well, including deviation angle and azimuth, but also azimuth of earth stress. This paper will start from stress field of wall of borehole to study borehole stability in inclined well. And with suitable destruction model of wall of borehole, the reasonable dynamic model and determine the safe mud density of deflecting well can be obtained exactly. The new model is used so as to calculate and determine the safe range of mud density in penetration and round-trip operations.
Ore-Forming Fluid System of the Anqing Cu-Fe Deposit, Anhui Province, China
Authors: Yang Guang Shu , Yan Yong Feng , Feng Peng Yu
Published: August 2013

Fluid inclusions, carbon and oxygen isotopic compositions were discussed to understanding the ore-forming fluid system of Anqing Cu-Fe deposit. Homogeneous temperatures of fluid inclusions ranged from 124°C to 570°C, δ13CPDB values of the gangue minerals ranged from-3.3 to-0.9, and δ18O values ranged from 9.4 to 10.7, respectively. The results reveal that the primary ore-forming fluid was magmatic hydrothermal fluid characterized by high temperature, the boiling and mixing of fluids occurred in the main mineralization stage, the magmatic water was dominant in the ore-forming process, the physicochemical condition changes of the fluid system led to the formation of skarn and the deposition of the ore minerals. The ore-forming materials were mainly derived from magma, partly provided by sedimentary strata.
Evaluation Model of Profile Control Layers' Selection Based on Fuzzy Cluster Analysis
Authors: Zhang An Gang , Fan Zi Fei , Song Heng
Published: August 2013

The selection of profile control layers is based on the decision made by single factor at present. Fuzzy cluster analysis based on transitive closure is introduced to establish an evaluation model of profile control layers' selection. Firstly, combining the static geological data and dynamic development data, the evaluation indexes which affect the selection of profile control layers are screened to form the evaluation index system; secondly, according to fuzzy cluster analysis theory, the evaluation index matrix related to profile control layers' selection is dynamically clustered, and the profile control layers are selected on the basis of each category's characteristics of geological and development; finally, the results of profile control layers' selection are examined by the comparison of water injection profile. In addition, the evaluation model is put into practice in a testing well group, and the application shows that the profile control layers selected by the model is reasonable and reliable.
Influencing Factor Study of CO2-Assisted Gravity Drainage in Extra-Low Permeability Reservoir
Authors: Wang Huang , Liao Xin Wei , Li Meng Meng , Lu Ning , Lv Yu Li , Liao Chang Lin
Published: August 2013

CO2 flooding is an important method of enhancing oil recovery (EOR) in extra-low permeability reservoir, which can resolve the problems of water flooding effectively. The EOR theory and influencing factors of CO2-assisted gravity drainage were studied in this paper. The influencing factors, such as reservoir dip, injection volume, injecting position, well placement and reservoir effective thickness were analyzed and optimized based on the theoretical numerical model which had been established according to Tuha Niuquanhu inclined reservoir parameters. This research indicates that CO2-assisted gravity drainage can effectively EOR if appropriate parameters were adopted. The results of this paper can offer suggestions to similar reservoir development.
Regional Estimation of Block Oilfield Rock Physical Parameters
Authors: Cong Lin , Liu Yang , Li Wen Long , Fang Hai Ou
Published: August 2013

Based on getting block oilfield original drilling core data, the study established a geological physical parameters database and visual geological model of block oilfield, including block areas model, fault model, surface model and so on, by choosing several block oilfield oil parameters and using geological sections. The paper established block model by using hexahedral subdivision skills, estimated three-dimensional space physical parameters by using geostatistics theory and constraints of block areas and faults. It got block oilfield rock parameters spatial distribution and supplied a effective method to find oil rich regions and reach rolling development goals.
Research on Efficient Microbial Enhanced Oil Recovery Technology Based on Low-Temperature Heavy Oil
Authors: Wu Gang , Ren Fu Ping , You Jing , Yu Ji Liang , Pei Ya Tuo , Liu Sha Sha
Published: August 2013

Based on the low-temperature and heavy oil reservoir of conventional injection well pattern separated two strains of oil degradation bacteria LC and JH which had satisfactory compatibleness with BaoLige oill field. In order to study the feasibility of enhancing oil recovery rate of the two strains, the experiment of huff and puff with 15 wells were carried out. The average concentration of bacteria increase from 4.7×102cells/ml to 8.1×106cells/ml. The average reduction of surface tension and viscosity is 33.1% and 31.9%. The accumulative total was 1163.2t. The ratio of input to output was 1:2.12. Microbial enhanced oil recovery can improve the low-temperature and heavy oil production status, which provide a effective method for the similar oil field.
The Application of Non-Acid Plug Removal Technology in Sandstone Formation
Authors: Shen Peng Fei , Li Ling , Chen Yong Sheng , Luo Wan Jing , Ji Na , Li Jian
Published: August 2013

Non-acid plug removal technology is new ways of plug removal technology which applies to unconsolidated sandstone reservoir. An effective plug removal agent will be chose through detailed study of the blockage features in block G104-5 of JD oil field. The production history curves show that the non-acid plug removal jobs with 5 well times in block G104-5 are all successful.
The Study and Application of Massive Hydraulic Fracturing Technique in Y104-6 Well Glutenite Formation
Authors: Lu Cong , Guo Jian Chun , Xue Ren Jiang , Wang Jian
Published: August 2013

Aiming at the southern areas of Bohai glutenite reservoir natural capacity is low, without obvious interlayer, filter lost badly, cause conventional hydraulic facturing in short of effect on increasing production, the paper conducted the research and application of technology on Y104-6 well. According to the reservoir geological characteristics and well conditions, the paper studied on fracturing scale determination, the perforating section, and the optimization of fracturing material selection, and application. Completed the injection into well fluid amount 1491.9 m3, proppant 188 m3, displacement of pump 7.5 m3/min. After treatment, average fluid flowing production achieved 18.6 t/d, average daily oil production 6.8 t, stimulate effect and the economic benefit is remarkable. This well fracturing technology, make the successful application of the southern areas of Bohai glutenite reservoir a significant breakthrough, recoverable reserves get promoted for big thick section glutenite reservoir development and vertical fracturing of the organization and implementation has provided valuable experience.
Effect of Na2SO4 on the Decomposition Rate and Product Size in Seed Precipitation Process
Authors: Wang Jia Wei , Lu Chang Yuan , Jia Yong Zhen , Lv Chang Sheng
Published: August 2013

According to working conditions of guizhou alumina plant, the influence of sodium sulfate impurity on the seed precipitation process was studied. The results showed that the seed decomposition rate decreased with the increasing of the sodium sulfate content, and when the additive amount of Na2SO4 was lower, the sodium sulfate can facilitate the agglomeration of aluminium hydroxides, when the additive amount was too high, sodium sulfate can make the granularity of the product fine finally.
A Study to Setting Function of Queuing Discipline in Highway Tollgate
Authors: Wang Li Ying , Feng Yong
Published: August 2013

The traffic capacity of the highway toll station strongly affects the traffic capacity of the whole road, and restricts road traffic. In order to avoid the highway traffic jams and decline of traffic efficiency, this article studied highway tollgate queuing discipline, which is one of the main contributing factors, aiming to reduce waiting time and reduce traffic jams. Based on the study of arrival rate of vehicles during peak hours and normal time, waiting time, queue length and the average efficiency of the service for each tollgate, a reasonable and feasible mathematical model is proposed. In this model, the vehicle arrival data obeys the Poisson distribution and transformed service time obeys the exponential distribution. Related data was given and the hypothesis test was conduced. By comparing rules before and after the establishment of the highway queuing model, the author offered suggestions on highway construction.