Integrated Intelligent Energy

Analysis on the failure of water circulating pump and the protective measures

ZHANG Lei;ZHANG Shengxi

2010, 32(3): 1-3.

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Boiler water circulating pump is the important auxiliary equipment for boiler steam and water circulating, because of having to bear with the impact of high temperature and high pressure water, its working condition is extremely wretched, while its failure would have serious influent on boiler operation. This paper analyzed three reasons which have made pump failures in the last 10 years: unqualified insulation craftwork of winding lead wire, halfhearted overhaul, unreasonable parameters and manners of operation and startingup/shuttingdown. After implementing the improved measures aiming at those problems, the failures times of boiler water pump have been reduced, and the reliability of the pump operation has been raised.

Reason analysis of high combustible matter content in flyash of 1025t/h boiler and improvement

GONG Hanqiang;LIU Zhaojun;ZHANG Nailiang;SHI Tianzuo;QU Xiaolin

2010, 32(3): 4-6.

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Due to the asreceived coal grade was reduced and the sundries in raw coal was increased, the directfired system of 1025t/h boiler of Shengli Power Plant was often blocked, and this caused the combustion of boiler to be not stable and the combustible matter in flyash to be increased. The blockage reason of the directfired system was analyzed, and an improvement scheme was determined and implemented. Then, the safety, stable and economical operation of the boiler was ensured.

Coalfeeding from separated bunkers manner for burning low grade coal in boiler

LEI Xiaocao;YANG Shengjun

2010, 32(3): 7-8.

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The coalfeeding from separated bunkers manner, which was adopted to burn the mixed low grade coal in boiler, was researched. The experiences of burning mixed low grade coal in boiler accumulated by Guotou Qujing Power Generation Corporation Limited were introduced, providing reference for same power plant in burning low grade coal.

Several influencing factors on operation and starting up of gas turbine

ZOU Zhihong

2010, 32(3): 9-10.

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Aiming at the overhaul and operation features of S109FA gas steam combined cycle power generation unit, combining with the operation experience of similar units, several influencing factors on unit operation and startingup were analyzed providing reference for gas turbine operation and overhaul management in other power plant.

The problems in sliding pressure curve and solving method

CAO Dinghua;LIU Shuanlian

2010, 32(3): 11-12.

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Starting from the principle of sliding pressure curve, the practical operation data of unit, the thermodynamic theory and safety of operation regulation, the problems in automatic sliding pressure optimized curve was found. Through the analysis of the influence of the attemperating water quantity on reheater, the suitable safety and economical operation mode was found, and the unit automatic sliding pressure operation was realized. Then the safety and economical efficiency of the unit had been enhanced.

Analysis of current inequality of generator excitation system

MAO Lisen;HE Jing

2010, 32(3): 13-16.

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The current inequality of excitation system of unit number 3 in Guohua Cangdong Huanghua Power Plant was analyzed. The reasons caused the current inequality of excitation system were proved by theory and experiment methods, and it is pointed out that the difference of alternating current input impedance is the main reason caused the current inequality of excitation system.

Analysis of reverse power protection application for hydroelectric generator of Three Gorges Hydropower Plant

JIN Jianbo;DONG Xiaoying;LI Zhichao

2010, 32(3): 17-18.

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The current situation of reverse power protection application in power system was introduced. The reverse power protection of 700MW hydroelectric generator in Three Gorges Hydropower Plant was analyzed as example. The necessity of reverse power protection for large mixed flow hydroelectric generator and the matters needing attention in its settings adjustment were expounded.

Reformation of thrust bearing system of pumped storage unit

ZHENG Jianfeng;SUN Yuzhe;HUANG Jiande

2010, 32(3): 19-22.

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The finding process of great defect in pumped storage unit thrust bearing system was introduced. The field detection was described. The reason caused the defect was analyzed. The treatment suggestion and prevention measures were put forward.

Reason of higher temperature of stator bar in 600MW generator

JI Qiang;SHI Zongguo;SHI Libin

2010, 32(3): 23-24.

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In the operation of turbogenerator set, the overheat phenomenon of stator bar was happened occasionally. According to the water flow test, it is decided that the main reasons of higher temperature of the generator stator bar are the corrosion of stator bar and water tube blockage by foreign body, which causes the water path to be narrow and the flow velocity of stator cooling water to be slowly. After the bar had been purged by water hammer, the water flow is not exceeding the average by ±10% and is accordance with evaluation requirement. Finally, the concrete measures for prevention of generator stator bar corrosion were given. 

Installation and debugging of distributed control system and research of technology for enhancing the reliability

LIU Xiangyun

2010, 32(3): 25-27.

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The distributed control system (DCS) of thermal power plant plays an important role in commission and operation of power plant and unit security. The quality of installation, system integration and debugging in construction period is the key for ensuring the unit to be successfully put operation and to create good economical benefit. Based on construction and debugging practice of thermal power projects, some technical requirements in DCS installation and debugging processes were analyzed, and some measures for enhancing the reliability of DCS were given.

Study on adjustment method of gland seal clearance of steam turbine

DING Huaigao

2010, 32(3): 28-30.

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The severe wear of shaft gland sleeve is widely existed in middle and small turbine units due to frequently startingup. In most thermal power plants, all front gland seals (rear gland seals) were adjusted according to the upper limit of specified value of the clearance given by manufacturer or larger value, and this caused the steam leakage of front gland seal to increase gradually, even caused the quality of turbine oil to deteriorate seriously. An adjustment method, in which the specified value given by manufacturer is combined with the maximum allowable value during hot startingup, was proposed, and the wear between the moving and static parts of gland seal was avoided successfully by the method.

The reason of pulverized coal leakage in single inlet and outlet steel globe coal mill

YIN Jun;YIN Minquan

2010, 32(3): 31-35.

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The current situation of coal powder leakage in direct fired suction coal mill for pulverized fuel boiler was introduced. The influence of coal powder leakage on safe and economical operation of boiler was summarized. According to the concrete situation of coal powder leakage, the reason of coal powder leakage was analyzed, and some problems existed in operation and maintenance were pointed out. The suggestion for further governing of the equipment was put forward.

Analysis of problems existing in sealing oil system of 200MW generator

MIAO Xiaodong;XU Yongchao;YIN Peishan

2010, 32(3): 36-39.

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The hydrogen humidity of six 200MW generators in Huadian Fularji General Power Plant was out of limits due to the water in oil of sealing oil system, and the operation of the sealing oil system was abnormal due to the larger sealing oil flow. The reasons of the problems abovementioned were analyzed, and combing with practical situation, the relevant improving methods were proposed. Then the security and economical efficiency of generator operation were enhanced.

Application of highefficient concentrator in Heilongjiang Chemical Group

WANG Haitao;L Yaowei

2010, 32(3): 40-42.

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The structure, working principle and technical characteristics of highefficient concentrator were introduced. The calculation and selection of the NSG20 type highefficient concentrator were discoursed, which had been researched and developed specially aimed at the operation condition of Ende Gasifier of Heilongjiang Chemical Group.

Drainage reformation of low pressure heater of a supercritical 600MW unit

ZHU Baosen

2010, 32(3): 43-44.

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The drainage of #7 and #8 low pressure heaters of a supercritical 600MW unit were impeded. The main causes were that the pressure difference in steam sides of #7 and #8 low pressure heaters was smaller, the level difference of drainage was larger and the resistance of drain pipe was larger. In the drainage reformation of a power corporation, the measures for reducing the system resistance, such as reducing the level difference of drainage, eliminating the drain valve, optimizing the pipe line allocation and so on, were adopted. After reformation and under the load greater than 300MW, the normal drainage of #7 and #8 low pressure heaters was realized.

Application of LC communication in 1000MW supercritical unit in Zouxian Power Plant

YAO Xiujuan;LIU San

2010, 32(3): 45-49.

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The first time application of LC communication in 1000MW unit of Huadian International Zouxian Power Plant was introduced. The practical application value and the feasibility of LC communication were discussed. Except traditional hardware connection, the LC communication is another development trend of signal transmission between different control systems.

Analysis of refrigeration system for concrete of Zhougongzhai Reservoir

HOU Zhongfa

2010, 32(3): 50-53.

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The design conditions, the operation conditions and the process flow of the refrigeration system for concrete of Zhougongzhai Reservoir were introduced. Aiming at the operation process, a series of technical improvement measures were put forward. The successful experiences in production operation of the refrigeration system were summarized, and this provides a practical foundation and reference example for optimal design and production operation of the refrigeration system for dam concrete.

Application of visual and programming operation in 110kV substation in Yixing city

SHEN Liang

2010, 32(3): 54-56.

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Combining with construction situation of programming operation project of 110kV Zhudong Substation in Yixing, the design thought of substation programming operation, the implement scheme and implement situation of the project were introduced, the concrete contents of programming operation in substation and in monitoring center were analyzed, the design thought of visual and programming operation in monitoring center was put forward, and the experiences of acceptance management were summarized.

Improvement measures for micropositive pressure device of enclosed busbar

LUO Guiying

2010, 32(3): 57-58.

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The problems occurred in operation of micropositive pressure device for phase separated, enclosed busbar of generator were introduced. According to an improvement example, the problems in reformation process and the countermeasures were analyzed. The opinion of this paper can be used as reference for micropositive pressure device reformation of similar power plant.

Treatments and analysis on water leakage of butterfly valve

SHEN Chunfeng

2010, 32(3): 59-61.

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Water leakage was appeared in the turbine inlet main valve (butterfly valve)after a long term operation in Dagang Hydropower Station, the main sticking point was found out by several times inspecting. In this paper its causes were analyzed comprehensively combining with the treatment experience, and according to the characteristics of the smalltype and mediumtype hydropower stations, some notices during the inlet valve installation and some effective solution ways for solution the problem have been put forward.

Repairing of cooling water valve of water circulating pump motor

L Pengfei

2010, 32(3): 62-63.

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In the cooling water system of water circulating pump of a 600 MW units, the threads of many valves were stripped, and this influenced on safety operation of units. Therefore, the valves must be replaced. Before replacement of the valves, the cooling water of the water circulating pump must be switched over to a temporary system, and the measures for the switching over and the matters needing attention were introduced. Some experiences and lessons were summarized, providing a reference for persons of same occupation.

The application of fast cooling device for cylinder in 300MW unit

TAO Xiangyun

2010, 32(3): 64-66.

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Fast cooling device is a kind of auxiliary equipments used when highpower steam turbine shutdown. The preparation before put to usage, operation procedures and regulation bases for usage were introduced in detail, the problems to be noticed in using of fast cooling device were analyzed. The calculation shows that great economic benefits can be obtained by using of fast cooling device.

Analysis of oil leakage of hydraulic turbine runner and reformation

LIU Xiaoyun

2010, 32(3): 67-69.

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The oil leakage of runner of unit number 1 in Hongjiang Hydropower Plant was introduced. By analysis, it is determined that the oil leakage was occurred in seal of runner paddle. A treatment scheme of replacing the material of paddle shaft sleeve was proposed and implemented. After the reformation, the paddle moved flexibly and stably, and the oil leakage of paddle seal was not found, and the unit operated safely and reliably.

Reason of gas turbine overtemperature tripping caused by anomalous power of generator

WU Fan

2010, 32(3): 70-72.

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The reason of S109FA gasturbine overtemperature tripping caused by anomalous power of generator was analyzed, and effective method for solving this problem was proposed, which can be used as reference for other S109FA units to treat similar problem.

Energy saving reformation of circulating water system and optimization of operation mode

HOU Zhaohu;YANG Jianping;SHI Zhenqin

2010, 32(3): 73-76.

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The operation mode of circulating water system of unit number 1 and unit number 2 in Huadian Baotou Power Generation Corporation Limited and related parameters of the circulating water pump, the water tower and the condenser were analyzed and researched. The motors of water circulating pumps number 4 and number 2 were reformed into high and low speed mode, and were put into operation. According to the feature of lower load in winter, the operation mode of circulating water system was optimized; based on the original ‘three pumps for two units’ operation mode, the ‘one pump for two units’ operation mode was realized successfully, and favorable economical benefit was obtained.

Application of chemistry analytical data in operation of limestonegypsum wet flue gas desulphurization system

TAN Zhong

2010, 32(3): 77-78.

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The chemistry analysis plays an important role in optimization of FGD system operation. The present operation situation of the system can be known by chemical analysis, and according to the operation situation, we can to adjust the system operation rationally to optimize the system operation.

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