Integrated Intelligent Energy

Experimental research on economical efficiency of sliding pressure operation of K-215-130-1 type steam turbine

YANG Xuhao

2011, 33(7): 1-3.

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Taking the Sovietmade K-215-130-1 condensing turbine as example, the thermodynamic performances of steam turbine under fixed valve position in constant pressure operation mode and in sliding pressure operation mode were tested and compared; and the optimal operation modes under different conditions were determined. The test results shows that, under the load range of 135MW to 175MW, the economical efficiency of sliding pressure operation mode is better than that of constant pressure operation mode. The result can be used to direct unit economical operation effectively and reduce the net coal consumption rate of the unit greatly.

Delicacy management of largecapacity steam turbine overhaul

LIU Demei;ZHANG Qingguo;LIU Yuanzhen

2011, 33(7): 4-6.

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The preparatory work before overhaul, the standardized work during overhaul and the tidying work after overhaul for largecapacity steam turbine were introduced, which can cause the technicians to understand the entire process of steam turbine overhaul clearly. This is helpful to ensure the seamless connection in the overhaul process, to enhance the overhaul quality of the steam turbine and to shorten repairing time; and it is useful for safe and stable operation of the unit in longer period.

Comparative analysis on heat supply cost of doubleextraction controlled steam turbine

LIU Yongjian

2011, 33(7): 7-9.

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According to the principle and characteristics of steam turbine doing work, the operation costs of two stage steam extractions of double extraction heat supply unit were comparatively analyzed; and some typical conditions were calculated. The calculated results show that the economic efficiency of the lowerstage extraction heat supply is not always better than that of higherstage extraction. The variation law of the extraction cost and its influencing factors were summarized; and effective calculation method of fuel cost suitable to the production field was put forward.

Analysis on reasons of jam of highpressure main stop valve in 300MW steam turbine

ZHANG Wenqiang;ZHANG Yaoyu

2011, 33(7): 10-11.

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From two aspects of the faults of thermal electrical signals or electro hydraulic converter and the mechanical jam of valve spindle, the reasons of jam fault of the highpressure main stop valve in a 300MW steam turbine were analyzed. The solution and preventive measures were put forward.
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Reformation of oil baffle of domestic 200MW steam turbine

WANG Haibo;XU Xu

2011, 33(7): 12-13.

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Since the two 200MW units of Zhengdong New District Thermal Power Plant were put into operation, some problems exist in turbine lube oil system, for example, the oil seems not too transparent, and the water content in the oil is out of limit. By using of the airsealing oil baffle, the bearing boxes of HP cylinder and IP cylinder of the turbine were reformed. After the reformation, the problem of higher water content in the lube oil was solved; the operation and maintenance cost was decreased greatly; the effect of the reformation is extremely significant.

Problems occurred in operation of heat supplying steam turbine set and treatment measures

YU Shunliang

2011, 33(7): 14-15.

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After the four N100-90/535 condensing steam turbines of Huadian Energy Mudanjiang Second Power Plant had been reformed into heat supplying steam turbines, some problems, such as the overtemperature of 7th section steam extraction and evaporation of feed pump, occurred. The faults reasons were found by using the experimental method. The unit operation mode was regulated; concrete preventive measures were formulated. So the difficult problems influencing on unit security and economic efficiency were solved.

Analysis on dynamic response of integrated conveyor gallery to multipoint excitations from moving belt

JIANG Xueshou;FU Zhenqi;ZHAO Yingjiu;HUANG Fu′an;LI Tian

2011, 33(7): 16-18.

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The dynamic response of integrated conveyor gallery structure under belt moving condition was analyzed. According to the mechanical characteristics of the integrated conveyor gallery structure when it is under the action of forces, the multipoint excitations of rotating carrier roller of the belt conveyor on the gallery structure was considered. Assuming that the excitations are uniform, taking typical engineering example as research object, using the finite element analysis method, the characteristics of dynamic response of gallery structure were researched. The result can be used as a theoretical basis for design of the integrated conveyor gallery structure to determine its dynamic load.

Analysis on reasons of larger mass concentration of oxygen in condensated water of level F gas turbine and treatment

YAO Xiaodong

2011, 33(7): 19-20.

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The reasons of larger mass concentration of oxygen in condensated water of the level F gas turbine in a power plant were analyzed. The treatment scheme was given. After reformation, the mass concentration of oxygen in condensated water system was decreased greatly, and the quality of the condensated water can satisfy the requirement of the boiler.

Startup system of supercritical Wflame boiler and its automatic control features

LI Youxin;WANG Lei;LIU Jingyu

2011, 33(7): 21-23.

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The composition of the startup system of the Wflame supercritical boiler in coalelectricity integrated Corporation Limited of Guodian Xingyang Power Plant was introduced. The automatic control features of the startup system were analyzed. Combining with the startup system operation mode and the control strategy, the procedures of boiler water circulating, boiler ignition, boiler pressure raising and turning into oncethrough operation mode were determined.

Optimization of chemical production technology for 600MW supercritical thermal power generating unit

ZHAN Huaqing

2011, 33(7): 24-25.

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The problems occurred in construction of ultra filter, water circulating system and boiler water feeding equipment of a 600MW supercritical unit were introduced. The relevant treatment schemes of process design, chemical supervision, structure anticorrosion and other aspects were given.

Analysis on fracture failure of bolt in highpressure main stop valve of steam turbine

DONG Yu

2011, 33(7): 26-27.

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The bolt of highpressure main stop valve of a power plant steam turbine was fractured. The physical and chemical test and the failure analysis for the fractured bolt, the material of which is 20Cr1Mo1VNbTiB, were carried out. The results show that during manufacturing process of the bolt of the main stop valve, the control of the heating processing was improper, and there was coarse grain in metallographic structure; in unit operation process, the intergranular crack occurred in coarse grain zone with high stress of the bolt, and the crack continuously extended. Finally, the leakage of the main stop valve and the bolt fracture failure were occurred. The measures to prevent the bolt failure caused by coarse grain were given.

Analysis on incomplete current differential microcomputer protection for medium and low voltage busbar

ZHANG Chengyu;YANG Guoquan

2011, 33(7): 28-29.

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Aiming at the features of medium and low voltage busbar system, the difficulties in implementation of busbar protection for this system were analyzed. The differences between the complete current differential protection scheme and the incomplete current differential protection scheme were analyzed and compared. Based on data acquisition and transformation through the analog channel of each protection device, the protection configuration, algorism selection and setting calculation were carried out respectively; and a complete solution for incomplete current differential protection was put forward.

Influence of variation of water content in asfired coal on unit operation

ZHOU Yangjun

2011, 33(7): 30-32.

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According to the analysis on the reasons of variation of water content in asfired coal and the influence of the water content variation on the unit operation, some concrete measures for decreasing the water content in asfired coal were put forward, which can be used as reference for similar coalfired power plants in their fuel management and energysaving and consumption reducing work.

Analysis on reasons of deviation occurred in locating of differential expansion detector for IP casing of S109FA single shaft gas turbine

ZHU Chenming

2011, 33(7): 33-36.

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The deviation occurred in locating of intermediate pressure differential expansion detector of S109FA single shaft gas-steam combined cycle unit in the Wangting Power Plant was introduced. The reasons of deviation occurred in locating of intermediate pressure differential expansion detector were analyzed. The solution was put forward; the locating method to eliminate the deviation was discussed. 

Analysis on reasons of larger heat deviation of high temperature heating surface of 670MW lean coalfired boiler and improvement

SUN Haiyuan;LI Dewen;FAN Xiaoming

2011, 33(7): 37-40.

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After the boiler No.3 of Huadian Weifang Power Generation Corporation Limited was put into operation in 2006, the heat deviation existed between the left and right tube walls of the heating surface, which easily causes the overtemperature in tube walls; and tube cracking accident had happened repeatedly. The reasons of boiler combustion heat deviation and steam temperature deviation were found; the reasonable reformation scheme and operation and adjustment measures were drawn up. The feasibility of reformation scheme and the measures was demonstrated by the test data. The scheme and measures were put into practical use successfully. 

Installation, operation and maintenance of chain system in slagdredger of 600MW boiler

LI Xiaohua;YANG Hongxi;ZHANG Lisheng

2011, 33(7): 41-44.

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The correct installation, use and maintenance of the chain driving system of the slagdredger are concerned with the normal running of the slagdredger of large thermal power plant, and influence on the stable operation of the boiler directly. The installation method of the chain system and the problems needing attention in its use and maintenance were introduced. The reasons of scraper deviation were analyzed, and relevant countermeasures were proposed. It was pointed out finally that if the type selection and use are proper, the domestic slag extractor chain can replace expensive import chain, and the operation cost of the chain system of thermal power generation enterprises can be reduced. 

Analysis on reasons of high voltage bushing end shield fault of 220kV transformer and treatment

TANG Jiahong

2011, 33(7): 45-47.

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There were serious electric discharge vestiges existing in high voltage side phase B bushing end shield of the 220kV transformer in a power plant. The acetylene exceeding the standard was inspected out in the insulating oil in the bushing. Based on analysis, it was judged that the fault reason is the defects of the bushing onhline detecting device in its design and installation, which cause the end shield grounding wire to be broken in operation, the end shield was in suspension, its electric potential was raised and the electric discharge was occurred. A new site bushing replacing method was put forward, in which the discharge of the transformer oil is not needed. By using this method, a mass of manpower and material resource was saved, and the repair time duration was shortened.

Analysis on coking of 300MW corner tangentialfired boiler

CHEN Xingyu;ZHU Guangming;WANG Xin;JIAO Qingfeng;DUAN Xuenong

2011, 33(7): 48-51.

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The reasons of coking occurred in a power plant due to firing highsulfur coal produced in Guizhou province were analyzed. The improvement measures were introduced, which were adopted by the power plant to alleviate the coking. These measures involve the coal blending, the air distribution, the oxygen control, the equipment reformation and other aspects. The coking was controlled effectively due to these measures without basic improvement of the coal grade.

Optimized reformation of mechanized sampling device for asreceived coal

TIAN Feng;WANG Huaiyu

2011, 33(7): 52-55.

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According to analysis and comparison of the performance test data of the two mechanized sampling devices for as received coal of Fujian Datang International Ningde Power Generation Company Limited before and after the reformation of the sampling devices, the problems of this type of sampling device were found, and solving scheme was given. The solution is helpful for safeguarding the impartiality and the fairness of commercial coal trading and can be used as reference for the enterprises using similar mechanized sampling device.

Analysis on reasons of jam fault of HP main steam valve and HP governing valve and preventive measures

LIU Ping;L Pengfei

2011, 33(7): 56-58.

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The structure and the functions of HP main steam valve and HP governing valve of 600MW supercritical unit in a power plant were introduced. The reasons of jam fault of HP main steam valve and HP governing valve were analyzed; and concrete methods and measures to prevent the jam fault of HP main steam valve and HP governing valve were put forward.

Analysis on a fracture accident of transformer bushing downlead clamp

SHU Yishi;WANG Wei;YU Peijie

2011, 33(7): 59-60.

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The configuration of the PST1200 series digital transformer protection device was introduced. In a 220kV substation, an accident of main transformer highvoltage side bushing downlead clamp fracture was happened in its copperaluminum transitional zone. The corresponding action logic of the protection device was analyzed; and it was pointed out that when the circuitfracture accident happened, the protection device should not activate or act to trip because of that the device can not feel the fault current. Aiming at common fracture accidents, some improvement measures were put forward, which is helpful for decreasing accident.

Methods for enhancing reliability of flame detector system

ZHANG Yanjun;ZHANG Junwei

2011, 33(7): 61-64.

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The working principle, the characteristics and the application of the flame detector system were introduced. The reasons of various faults of the flame detector system were analyzed. Some methods for enhancing the reliability of the flame detector system were listed, which can be used as reference in prevention for similar large boiler in explosion prevention and ensuring its safe operation.

Application of desulphurization synergist in thermal power plants

PENG Guiyun;ZHU Yue;GAO Zhenglai;CHENG Xueshan;SONG Guangtian

2011, 33(7): 65-67.

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The experiment of using desulphurization synergist in 600MW unit desulphurization equipment of a power plant was introduced. Originally, it was necessary to run three slurry circulating pumps to make the SO2 emission concentration can meet the requirement of related standard. After the desulphurization synergist had been used, the desulphurization efficiency was increased obviously, and only two slurry circulating pumps must be run for the same target; the electric energy consumption was decreased by 951kW·h in a hour. After the desulphurization synergist had been used, the characteristics of the slurry in FGD system and the desulphurization gypsum does not vary obviously; especially, the mass fraction of Cl- and the pH value do not vary obviously, which shows that the desulphurization synergist would not enhance the corrosion of the system, and it would not influence on the gypsum quality too. So, the using of desulphurization synergist has obvious economical benefit and social effect, and does not cause negative influence on the desulphurization system.

Analysis on feasibility of carbon capture and carbon capture & utilization & sequestration technology

LI Xiangling;SUN Shouyi;XU Wei

2011, 33(7): 68-71.

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Combining with the situation of domestic primary energy source and power industry structure, the problems faced in field of domestic economy and electric power development were analyzed. Under the large background of energy saving and emission reduction, it was proposed to plan and construct the demonstration project of carbon capture and utilization and sequestration technology based on carbon capture technology, the purpose of which is to find the optimal way to solve the contradiction between the energy demand of economic development and the environment protection and find a new development mode for electric power industry of our country.

Online monitoring technology for mercury emission into air from coalfired power plants and its application

ZHANG Jie

2011, 33(7): 72-76.

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The principles and the methods of the flue gas sampling system, the mercury form transforming system and the mercury analysis instrument in different mercury online monitoring devices were analyzed, and their differences and similarities were compared. The practical application of the mercury online monitoring devices and their performance evaluation were introduced. Aiming at the problems, which may exist in flue gas mercury online monitoring in domestic coalfired power plants, and the next work, some suggestions were put forward.

Operation mode of water circulating pump and energy conservation analysis

JIN Yanhai;KAN Hong

2011, 33(7): 77-78.

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The general situation of 3×390MW gassteam combined cycle units of a power plant project phase I was introduced. The unit system operation mode and the pipingmain scheme operation mode of the water circulating pump were expounded. Based on regulation of the unit system and pipingmain scheme operation modes and the calculation and analysis of the motor power, the economical efficiency of the unit can be increased furthest, and the house service consumption rate can be decreased.

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