Integrated Intelligent Energy

Numerical simulation of viscoplasticity behavior of 30Cr1Mo1V steel based on Chaboche model

ZHANG Miao;YUAN Xinyong;NI Yongzhong

2012, 34(9): 1-4.

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Using the Chaboche model, the cyclic plasticity and viscoplasticity behaviors of 30Cr1Mo1V steel were described. By experiment, the fatigue and stress relaxation data of 30Cr1Mo1V steel under different stress levels were obtained. According to the experimental data, the parameters of the Chaboche model were obtained gradually. The user subroutine UserMat of the Chaboche model is linked into ANSYS software to simulate the fatigue and creepage behaviors of the material. The result shows that the user subroutine can reflect mechanical behavior of the material well, which provides theoretical foundation for study on fatigue and creepage interaction using the Chaboche model.

Tridimensional nonlinear finiteelement analysis on diversion tunnel of Lizhou Hydropower Station

HUANG Chao;YANG Peizhang

2012, 34(9): 5-9.

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The structure of the diversion tunnel, which is a typical underground engineering, is complex; and the geology condition of the tunnel is various. Therefore, it is cannot reflect the combined force characteristics of the lining structure and the surrounding rock completely by means of the traditional structure calculation method. Taking the diversion tunnel of the Lizhou Hydropower Station as example, using the finiteelement numerical simulation method, the stability of the tunnel surrounding rock and the force characteristics of the structure were researched. The problems existing in traditional algorism were solved well. The method of this paper can be used as reference for calculation of similar projects.
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Simulation analysis on setup of vents for magneticlevitation bearing device of hydraulic turbinegenerator unit and its affect

LIAO Jiajun;FAN Yu;WANG Xing

2012, 34(9): 10-13.

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Aiming at too high temperature rise of the magneticlevitation bearing device of the hydraulic turbinegenerator unit caused by poor ventilation, a solution to set up certain amount of vents was presented. Using the finiteelement analysis software ANSYS, the simulation analysis on the temperature field and the magnetic field was carried out. The results show that to set up the vents can reduce the temperature of coil of the magneticlevitation bearing device greatly, and the temperature rise requirement of the system can be satisfied.

Application of computeraided design for smalldiameter pipe line construction in thermal power unit installation

MA Chao;LI Jianwei;XIE Hua

2012, 34(9): 14-16.

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Taking the installation and construction of unit No.3 of Hubei Huadian Xisaishan Power Plant project phase II as example, the application of the computeraided three dimension design technique in installation design of thermal control pipe line with small diameter of thermal power unit was introduced, which can be used as reference for similar construction task.

Application of NetSim software of OMICRON tester in CT saturation test

ZHU Junhong;ZHANG Xiaobo;HU Bao;WU Mengli

2012, 34(9): 17-20.

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The concrete method of CT saturation test using the network simulation software NetSim of the OMICRON tester was introduced. The main parameters influencing on CT saturation were analyzed. To use the NetSim software in CT saturation test has advantages of flexible setup, easy operation and true and effective simulation; it can play important role in relay protection device test.
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Analysis on practical example of PLC bus communication error caused by electromagnetic interference

XIAO Jiangkai

2012, 34(9): 21-22.

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The abnormal communication error of PLC bus system in Anhui Pingwei Power Plant was described. According to the detection and analysis of hardware and software, it is determined that the reason of the communication error is electromagnetic interference. The cause of the electromagnetic interference was analyzed; and the concrete solution was given, which provides reference for processing of similar problems.
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Analysis on reason of PT highvoltage fuse blow in a power plant

DOU Zhanliang;ZOU Hui;YU Meng

2012, 34(9): 23-26.

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The neutral point of the generator often grounded through a blowout coil. In system operation process of a power plant, the highvoltage fuse of potential transformer may blow and make negative influence on the system sometimes. The operation features of the power plants were analyzed ,in which the neutral point of the generator is grounded through a blowout coil，and it is an important reason that the drift voltage of the neutral point will be amplified by the blowout coil. A preventive scheme was proposed, in which a resistor is connected in series with the blowout coil to restrain the amplifying effect of the drift voltage of the neutral point and to prevent the PT fuse blow; an electronic switch is connected in parallel with the resistor to control the resistor. Taking a hydropower plant as example, the effectiveness of this scheme was verified.

Application of plastic film impervious technology in the mediumsize boiler

CAI Lixin

2012, 34(9): 27-28.

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At the top of 220t/h boiler has been problem of gas leakaged and ash leakaged in Baling Petroleum Chemical Company.The characteristic of new plastic film impervious sealing technology and defect of original design were analyzed. After technology was improved, the problem of gas leakaged and ash leakaged were solved, the best effect of environmental protection,energy saving and safe was obtained. This technology by used of specific material and plastic structure design，furnish a new way to resolve the problem of same mediumsize boller gas leakaged and ash leakaged.

Study on key problems of GIS intelligentization

GUO Le

2012, 34(9): 30-32.

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The intelligentization of the gas insulated switchgear (GIS) is an important aspect for intelligent substation system. Starting from the practicability, aiming at the current technical development level and the user acceptance, the problems existing in the design of the GIS control circuit, the online monitoring, the electronic instrument transformer and the control cabinet scheme were expounded. The performance and reliability of the control circuit were improved by using of the unified design of the mechanism box and the intelligent terminal. Considering the feasibility of engineering implementation, an integrative online monitoring scheme was put forward. It is pointed out that in order to apply the new technology and the new method, the relative test instructions and calibration methods should be amended to adapt to the needs of technology development.

Start mode of 330MW direct aircooled unit without auxiliary steam source

WANG Chaoyang;SUN Jianlei;NAN Weiliang;WANG Hui

2012, 34(9): 33-34.

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The rapid hot start method of the unit of capital construction and the unit operating in lone island mode without auxiliary steam source was introduced and analyzed. Comparing with the normal hot start method, the new method can shorten the accident time and increase the economical efficiency of the unit. In addition, this method plays an important role for prevention of freezing of direct aircooled system in winter.

Analysis on too large synchronous error of radial gate with dual lifting points

HE Xiaoping

2012, 34(9): 35-38.

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The reason of too large synchronous error occurred in operation of the radial gate of the floatage drains of a hydropower plant was analyzed. Using the beforehand given deviation compensation of the opening, the load deviation value was decreased. For the radial gate with dual lifting point, which has better rigidity, the rigid synchronous loop or load balance control mode should be adopted; and the cylindrical hinge or cone hinge should be used as supporting hinge. Thus, the too large synchronous error will be controlled more easily.
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Analysis on reasons of air leakage of HP1103 medium speed mill external air sealing device and countermeasures

L Yanchun

2012, 34(9): 39-40.

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The reasons of air leakage of HP1103 medium speed mill external air sealing device of 600MW unit (No.9) in Qinghe Power Plant project phase I were analyzed. By installation of the compound rubber sealing additionally, the external air sealing device of the mill was reformed. After the reformation, the reliability and the operation economic efficiency of the mill were improved, and the site environment was ameliorated greatly.

Analysis on key technologies of boiler pipe blowing for subcritical cogeneration unit

LI Chunjian;DUAN Xiaoyun

2012, 34(9): 41-44.

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The 2×330MW cogeneration unit of a power plant was taken as research object. The key technical problems about the selection of the pipe lowing scheme of the unit, the pipe blowing process flow and the matters needing attention in pipe blowing process were researched and analyzed. The practice shows that this task of pipe blowing had been accomplished successfully，and the expected effect was realized. The common problems in pipe blowing process, such as overtemperature of the heating surface and heating of the reheater without steam, were avoided.
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Analysis on abrasion of tail heating surface of 660MW ultra supercritical boiler

YI Darui;WANG Xiaoya

2012, 34(9): 45-47.

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The abrasion of the tail surface of the 660MW ultra supercritical boiler in Jiangsu Guohua Chenjiagang Power Generation Company Limited was analyzed.The problems existing in abrasion preventing device was determined clearly by calculation, and the improvement suggestions were put forward.

Analysis on reason of poor foam characteristics of fireresistant oil and treatment

WANG Hui

2012, 34(9): 48-50.

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According to the mechanism of exceeding standard of fireresistant oil foam characteristics, the treating process of foam characteristics exceeding standard of fireresistant oil in the small turbine A and B of unit No.4 of Guangdong Datang International Chaozhou Power Generation Company Limited was expounded. The influence of the mineral oil content in the fireresistant oil on the foam characteristics of the fireresistant oil was analyzed in depth. Some suggestions about the operation and maintenance of the fireresistant oil control system were put forward.
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Maintenance and backup of distributed control system

ZHUO Changtuo;LI Na

2012, 34(9): 51-58.

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By field practice, research and perfection, the automatic backup by one key of FOX I/A Series 7.0 control system based on UNIX operation system was realized.The difficult problem of program backup of distributed control system was solved. The work load of relevant persons was lightened, and the safety and reliability of the equipment were improved.

Analysis on reason of unit trip without protection device action and treatment measures

GONG Fangjie

2012, 34(9): 59-61.

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At almost the same time interval of the past two years, the unit No.4 of a power plant tripped while there was no protection device acted. Aiming at the phenomenon, the fault report was checked; the trip circuit was inspected; the design paper was analyzed; and the simulated fault experiment was carried out. The reason of unit trip was determined finally that there was defect in the emergency lighting circuit, which caused the AC power source to intrude into the DC loop during switchover operation in fixed period and made a grounding fault of DC system, and the grounding fault caused the unit outlet switch to trip. The emergency lighting circuit had been improved; and the hidden danger of the AC power source intruding into DC loop was eliminated.

Application of positive pressure densephase pneumatic ash conveying system in Douhe Power Plant

WANG Jianfeng

2012, 34(9): 62-64.

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Some problems occurred in practical operation of the ash conveying system of boilers No.3 and No.4 in Datang International Douhe Power Plant, which include that the system stability is poor, the system defects occurred frequently, the material level of the electrostatic precipitator is higher, the wear of the system is serious, the allowance of the pressured air is insufficient and others. The problems were analyzed ,and the solving methods were proposed.

Analysis on reason causing the 500kV main transformer breaker failure protection to refuse to trip

WANG Tianmin;ZHANG Xiaogang;GAO Bo

2012, 34(9): 65-66.

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It was found that after the 500kV main transformer breaker failure protection acted, the function of intertrip of the switches in three sides of the main transformer can not be realized in the transmission debug process of a 500kV substation. The fault in this circuit was analyzed, and it was pointed out that the main reason of this fault is the design error which result the malfunction of the 500kV main transformer breaker failure protection to refuse to trip . A solution was proposed to avoid effectively refusing to trip and tripping improperly.
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Research on utilization of residual heat in lowtemperature flue gas of coalfired power plant

SHEN Yuhui;TAO Aiping;DENG Huipeng

2012, 34(9): 67-69.

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Aiming at the problems, which occurred in the desulphurization system of thermal power plant after its GGH was abolished, a solution proposed in this paper is to install a lowtemperature flue gas heat recovery device. The problems existing in present desulphurization systems can be solved including the waste of flue gas heat, the higher water consumption of the wet desulphurization, the unsafe operation of the wet smoke stack after desulphurization and others. In addition, using this solution, the power generation efficiency can be increased by about 0.3% or the lowquality heat equivalent to 4% of generated electricity can be recovered.
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Analysis on experiment of reducing NOx mass concentration in boiler flue gas by use of swirl burner

LI Xianghui;CAO Guodong;ZHAO Dongfang

2012, 34(9): 70-74.

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In coalfired power plant, the coal grade, the primary air ratio, the boiler load and the control of air distribution mode of the burners are important factors influencing on the NOx generation. To adopt the airclassified combustion technology can reduce the concentration of NOx emission. In low load condition, the capability of the swirl horizontal concentrateddiluted pulverized coal burner to control NOx generation is poorer, and this problem was analyzed experimentally. Based on optimization, better economical benefit and social effects were obtained.

Analysis on feasibility of heat storing electric boiler application for energy storage and peak shaving to increase utilization rate of wind power capacity

LIU Qingchao;ZHANG Qingyuan;XU Xia

2012, 34(9): 75-78.

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In the west region of Inner Mongolia, at night, the ongrid energy of wind farms is limited to smaller value by the power grid; and this is one of problems needing to be solved imminently; and at present, the research emphasis in wind power industry is how to increase the ongrid energy of the wind farms at night. From the point of view of several ways,increasing the night load was considered as selectable measure and was analyzed， and concrete method was put forward that is to use the heat storing electric boiler to store heat energy at night，the stored heat can be used for heat supply in daylight. The purposes of prolonging the available work hours on the network by wind farm and increasing the efficiency of green power were achieved.

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