Integrated Intelligent Energy

Optimization of reheat temperature control strategy for 630MW supercritical unit

SHANG Jun;SHI Gang

2010, 32(6): 1-3.

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In the reheat temperature control of the 630MW unit of Guoxin Yangzhou Power Generation Corporation Limited, there was large time delay, nonlinear and drastic disturbance for the controlled object. Using the state variable method, the fuzzy control technique and the intelligent feedforward compensation technique comprehensively, the reheat temperature control strategy was optimized, and the better effects were obtained in practical operation. 

Structure and optimization features of 660MW ultrasupercritical boiler in Chenjiagang Power Plant

XUE Qinghong

2010, 32(6): 4-6.

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The structures and the optimization features of the water wall, the starting system, the burner, the separated chimney flue of the 660MW ultrasupercritical boiler in Guohua Chenjiagang Power Plant were introduced and analyzed, which can be used as reference for similar boiler in operation and maintenance. 

Fault analysis of low pressure flow passage of Hitachi 1000MW ultrasupercritical turbine

LI Xiangling;WANG Xiaozhu;LI Xutao;LI Ping

2010, 32(6): 7-8.

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The heavy steam and water corrosion of low pressure flow passage of 1000MW turbogenerator set in Huadian International Zouxian Power Plant was found in first inspection overhaul. The material of low pressure flow passage and its operation condition were analyzed, and the condition of low pressure passage was compared with that of subcritical turbine low pressure passage made using same material and the corrosion was not occurred here. The reason of the corrosion was found, and relevant measures and suggestions were put forward.

Reformation of air extraction system of twopressure condenser in a supercritical unit

ZHU Baosen;LIU Bin;LIU Zunping;SUN Guangyu

2010, 32(6): 9-11.

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The air extraction tubes of highpressure condenser and lowpressure condenser in a unit were arranged in series mode, and this caused the extracted air of highpressure condenser to push aside the extracted air of lowpressure condenser. The air extraction of lowpressure condenser was not reached to the designed requirement; the vacuity of the lowpressure condenser was lower, and the difference between highpressure condenser and lowpressure condenser was also lower. Then the system economical efficiency was decreased. The air extraction system of twopressure condenser had been reformed by adopting some relevant measures, and obvious economical benefit was obtained. 

Research on optimal design of water treating island of thermal power plant

HAN Mailiang;MA Xuewu;WU Zhiyong

2010, 32(6): 12-16.

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The water treatment system and its structures of thermal power plant usually were arranged separately in accordance with the treatment units; the independent workshop, the control room and the operators and maintainers were configured for each unit. The concept of the water treating island means that the various systems of the thermal power plant should be optimized and organically integrated into the water treating island, and formed a water treatment area which will cover entire power plant. By using this area, the water supply according to different grades and different water quality will be realized, and the waste water will be recovered. It will be helpful for the target of energysaving and the emission reducing.

Fault treatment of unable keeping latchon state after latch operation of 200MW turbine

MA Suyuan

2010, 32(6): 17-21.

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In the emergency tripping system of the 200MW steam turbine manufactured by the Dongfang Turbine, the more mature highpressure tripping module and lowpressure tripping module were adopted. However, in commissioning process of the unit No.2 of the Zhengzhou Zhengdong New District Heat and Power Corporation Limited, at the start, the turbine could not latched repeatedly; and after latched, the system was unable to keep the latchon state. The fault was analyzed and researched in depth, and the problem was solved finally.

Research on optimal operation of mainpipe scheme feed pumps set

QU Tianzhang;WEI Hongqi;PEI Dongsheng;JIANG Wenhao

2010, 32(6): 22-26.

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Adopting the Apros 5.04 advanced procedure simulation support system, taking the feed water pipes network system of a thermal power plant as research object, through the modeling, which is based on the graphical configuration provided by the system, and the automatic simulation calculation, the model of the water feed pipe network was developed. The parameters calculated by using the model were analyzed; the operation characteristics of the water feed system was grasped; the power consumptions under different feed water pump combination were obtained, and its influence on the feed water flow distribution of the high pressure heater was determined; the optimized economical operation mode was realized. The realization of this project will greatly enhance the operation level of the feed water system of whole plant and the equipment monitoring level, will perfect the examination and the analysis of the economical index, and it is of important significance for the security and the economic efficiency of the units of whole plant. 

Reliability analysis and technical reformation for boiler toothed rope pulverized coal conveyor

DAI Zhigang;

2010, 32(6): 27-29.

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The pulverized coal conveyor is the key auxiliary equipment in boiler milling system of power plant, and it plays important role for boiler safe operation. The faults were occurred frequently in operation of the toothed rope pulverized coal conveyor of Zhengzhou Xinli Electric Power Corporation Limited, and the maintenance cost of the conveyor was higher. The reasons of the lower reliability of the boiler toothed rope pulverized coal conveyor were analyzed. A reformation scheme was put forward, and the better results were obtained after the scheme had been implemented. 

Reason analysis of malfunction of incomplete differential protection for a generator

WANG Guilai

2010, 32(6): 30-34.

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The differential protection is main protection for generator, and if it can act correctly will directly influence on the security of the main equipment and the stable operation of the system. The reasons of the malfunction of the incomplete differential protection of a generator were analyzed; and it is pointed out that the basic reason of malfunction of differential protection is the deterioration of the excitation characteristics of the current transformer used in differential protection circuit.

Control scheme of selfsupply thermal power plant of Duolun coal & chemical project

MA Yumin

2010, 32(6): 35-37.

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The process system, the electric system; the operation condition and the control scheme of the selfsupply thermal power plant of Duolun coal and chemical project were introduced. In order to ensure the selfsupply power plant to operate safely and reliably, the key problems, which must be solved in control of mainpipe scheme unit, and the solving scheme was proposed. 

The application of APA software on nuclear piping mechanical analysis

CHEN Min;ZHANG Zhouhong;WU Gaofeng;TANG Feng

2010, 32(6): 38-41.

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The APA software has the capability of the nuclear piping stress analysis and assessment, and the ANSYS finite element analysis software has the capability of piping stress computation. Taking a nuclear piping system class 2 of a nuclear power plant as analysis model, the stress computations of various load condition were accomplished. According to the RCCM codes, the stress assess was carried out, and the maximum stress, the stress rate and the support reaction of each pipe supporter and hanger under static load and dynamic load were obtained.

Electrical insulation test of stator winding of hydrogencooled generator

MAO Yingqing

2010, 32(6): 42-43.

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Taking the 390H hydrogencooled generator of the Huadian Hangzhou Banshan Power Generation Corporation Limited, which was put in production in 2004, as example, comparing the electrical test instruction of GE Corporation with the domestic standard, according to the insulating material and the process of the stator winding, the reasons of the difference between the china standard and the foreign standard were analyzed, and the relevant electrical test method of hydrogencooled generator stator winding (epoxymica insulation system) was determined. The electrical insulation supervision was accomplished preferably. 

Analysis on fault of control circuit of 500kV GIS breaker and treatment

XU Zhi;YANG Zengjie

2010, 32(6): 44-46.

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In Huaneng Jinghong Hydropower Station, during the transmission test of the 500kV GIS breaker before it was put into operation, it was found that there were some problems existed in closing circuit of the breaker. The parasitic circuit, which was caused in match of the operation mechanism of the breaker with antijump device and the protection device, and its hazards were analyzed briefly. The antijump function of the protection device and the internal antijump function of the operation mechanism were compared. A more rational improvement scheme was put forward, and the importance of the antijump function in the secondary circuit was pointed out.

The reason of leakage of high pressure heater and countermeasures

CHEN Tao;WEI Shengluan

2010, 32(6): 47-49.

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The two 150MW steam turbine units of Sichuan Huadian Panzhihua Sanwei Power Generation Corporation Limited were put in operation at 2005. Since then, the leakage fault of high pressure heater No.2 often occurred in operation. Up to the August 2007, the blind tube rate of No.11 and No.12 units reached 8% and 9% respectively, and this influenced on the safety and economical efficiency of the units badly. According to the fabrication, erection, debugging and actual operation of No.2 high pressure heater, the reason of leakage of No.2 high pressure heater was analyzed, and relevant solving measures were proposed. After effective rectification, the operation rate of No.11 and No.12 high pressure heaters were raised from previous 79.62% and 81.98% to present 99.32% and 98.43%, the safety and economical efficiency of the unit operation were raised.

Analysis of slagoff machine faults of 300MW unit and countermeasures

L Daqing

2010, 32(6): 50-51.

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The operation principle of the slagoff machine was introduced. The defects of the submerged slagoff machine, such as the scraper blade tilted, the guide wheels stopped to rotate due to the wear down of the inner guide wheel, the belt conveyor in the top of the chamber was designed irrationally and others，were analyzed. Some feasible countermeasures were formulated and implemented. The equipment defects occurrence was reduced, and the operation reliability of the slagoff machine system was increased. 

Optimal reformation of ash conveying system of 300MW unit

JIN Yanhai

2010, 32(6): 52-54.

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In a 300MW unit, after it was put into operation, the ash conveying system was not functioning properly, and the pipes often were plugged. The faults were analyzed, and according to the appeared problems, the pertinent improving measures were put forward. The result of the reformation was favorable. 

Feasibility analysis of operation at excess output of unit No.2 in Qingxi Hydropower Station

LIU Yuanxiong

2010, 32(6): 55-56.

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The test purpose of the unit No.2 of the Qingxi Hydropower Station was introduced. The requirements of the test condition, the test procedure and the measured parameters of the unit No.2 were expounded. The conclusion of the test and the suggestions were given. It was pointed out finally that after the capacityenlarge reformation of the Qingxi Hydropower Station, not only the power generation and the peak shaving capacity were increased, but also the remarkable economical benefits and social effects were obtained. 

Reformation of cool terminal heat exchange elements of air heater using enameled elements

BAI Xueli;ZHAO Junbin

2010, 32(6): 57-60.

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The cool terminal corrosion of air heater is occurred unavoidably in sulfur coalfired boiler; even, the heat exchange element could be badly damaged and blocked; and this could cause the overlarge pressure difference of gas duct and the induced draft fan stalling, even cause the boiler shutdown. The heat exchange elements were replaced by enameled elements. After the reformation, the problem of cool terminal corrosion was solved fundamentally. 

Analysis of EH oil system pressure decrease in 330MW turbine and treatment

L Fuzhou;MA Baohui

2010, 32(6): 61-62.

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The fault of pressure slowly decreasing occurred in the 300MW turbine EH oil system of Huadian Weifang Power Generation Corporation Limited. The factors, which probably influence on the pressure, were confirmed and eliminated one by one, and relevant measures were proposed. After a minor overhaul, the unit was startedup again, and the EH oil pressure and the oil pump motor current became normal.

Application of arc protection in middle voltage auxiliary power system of thermal power plant

ZOU Xuan

2010, 32(6): 63-64.

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The composition of the arc protection device was introduced. The situation of the protection of middle voltage auxiliary power system of thermal power plant and existing defection were analyzed. Taking a typical 2×300MW thermal power plant project as example, the design and application scheme of the arc protection for middle voltage auxiliary power system was discussed, and the application prospect of the arc protection device was presented. 

Variable frequency speed control of condensate pump

CHEN Yongshun

2010, 32(6): 65-66.

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The energysaving principle of variable frequency speed control for condensate pump, the connection of the frequency convertor and the protection configuration were introduced. The advantages of the variable frequency speed control of the condensate pump was analyzed; the problems existing in operation of the variable frequency speed control system was analyzed too, and the treatment method was put forward. By using the variable frequency speed control technology, the cost of the unit operation and maintenance were reduced, and the purpose of energysaving and emission reducing was realized, and the economical and social benefits of the enterprise were increased. 

Treatment of stator grounding protection device action in 390H generator

SHEN Jun;SHEN Liping;YU Lifan

2010, 32(6): 67-69.

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The typical main connection of 390H generator of S109FA unit and two stator grounding protection methods of matched G60 device were introduced. The treatment process of stator grounding protection action was described, and the reasons of protection action were analyzed. At last, the suggestions for finding the fault reason in accident treatment of S109FA unit were given.

Analysis on a fault which caused the stator earthfault protection action

LIU Fang

2010, 32(6): 70-71.

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A fault of Guangdong Zhuhai Jinwan Power Generation Corporation Limited, which caused the stator earthfault protection acted, was analyzed, and the analysis proved that the protection acted correctly and timely. Starting from the questionable point that the fault phenomenon was not accordance with the actual inspection, by using the vector diagram, according to the intuitive analysis, the fault process was determined that the opencircuit fault was occurred first, and then the shortcircuit fault occurred. By further analysis, the conclusion obtained that the protection action process was fully accordance with the field inspection result, and it is verified that the settings of stator earthfault protection is correct.

Analysis for the gypsum dewatering system of flue gas desulphurization technical reformation project in Xisaishan Power Plant

DENG Huipeng;SHEN Yuhui

2010, 32(6): 72-75.

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The configuration of the gypsum dewatering system of the wet flue gas desulphurization technical reformation project in the Xisaishan Power Plant was introduced in detail. The process flow, the burden apportionment, the operation and the maintenance of the system were analyzed. The advantages of the gypsum dewatering scheme of the Xisaishan Power Plant in different load conditions were discussed; especially, the features of the gypsum dewatering system, such as the clear process flow, the high reliability, the operation flexibility, the watersaving and the energy saving ability were expounded emphatically.
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Research on characteristics of solar power technology

DANG Suogang;GAO Fuchun;HAN Pengwu;WANG Liping

2010, 32(6): 76-80.

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The model of PV inverter and its control strategy were expounded. Various characteristics of interconnection with power grid were analyzed. The criterions for selecting the capacity and the form of the dynamic reactive compensator were determined. The output characteristics of the PV power station and the selection of its operation mode were discussed. The LVRT ability of the PV power station in abnormal situation of the power grid was studied; and the enhancement of LVRT ability of PV power station by the dynamic reactive compensator was studied too. It was considered according to the simulation analysis that the Huadian Jiayuguan PV power generation project is satisfied the conditions for interconnection with the power grid; the theoretical analysis and the simulation analysis for the project were more accurate, and the experience obtained during this project construction can be used as reference for future PV power station development. 

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