Integrated Intelligent Energy

Study on technical changes and influence factorsin power generating equipment manufacture

GONG Jingkun;YU Bo;HAO Shengbin

2010, 32(4): 1-7.

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The technical changing track of the thermal power generation, the hydropower generation, the nuclear power generation and new energy power generation were analyzed. On this basis, the influence factors on the technical changes of power generation equipment manufacture, which includes eight aspects such as the development investment, the organization, the manufacturing scale and so on, are analyzed emphatically. The research of the technical changes in power generating equipment manufacturing and the influence factors presented in this paper can provide a basis for the power generating equipment manufacturer to find the innovation opportunities and to select the suitable innovation mode.

Effect of SOFA swing angle in combustion adjustment of 600MW supercritical unit

ZHOU Liqun;ZHANG Bizhu

2010, 32(4): 8-11.

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Based on the boiler combustion adjustment experiment, the second air flow, the O2 content and the flue gas temperature were calibrated and verified. The influence of the SOFA swing angle adjustment on the steam temperature deviation was tested, and the optimized operation parameters of horizontal swing angle of SOFA were recommended.

Reformation of normal drain system of low pressure heater in 600MW supercritical unit

L Pengfei

2010, 32(4): 12-13.

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The problems existed in normal drain systems of low pressure heaters of 2×600MW supercritical units in a company were introduced. The reason of impeded drain water of the normal drain systems was analyzed, some improving measures and proposal were put forward, and better effects were obtained in practical operation.

Vibration causation analysis of turbofeed pump in a supercritical unit and treatment measures

ZHU Baosen

2010, 32(4): 14-15.

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In trail operation of a turbofeed pump, the sudden vibration was occurred. After operation a period, the sudden vibration became frequently, the vibration amplitude became larger, and the vibration duration became longer. According to the diagnosis and analysis of the vibration fault, obvious lowfrequency vibration component had been found, and it is determined that there was fault in bearing shell of feed pump. The bearing shell had been treated; and then the sudden vibration was weakened and less than alarm limit, so the sudden vibration was decreased obviously or was eliminated basically.

Analysis of circulating water system optimization for ultrasuper cirical coalfired units

CHANG Hailong

2010, 32(4): 16-17.

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For coalfired power plant construction, in order to select better water circulating pump, condenser and cooling equipment, and to determine the size of structures, it is necessary to optimize the circulating water system. According to the natural conditions of the plant site and technical and economical conditions, based on the designed back pressure of the turbine (exhaust pressure), the optimization thinking and method for whole circulating water system were given. 

Analysis of control scheme for solar energy photovoltaic power generation system

WANG Zhigang

2010, 32(4): 18-19.

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The solar energy photovoltaic power generation is a new power generation technique, combining with the 1.6MW solar energy photovoltaic power station project, which was connected with power grid, in Linuo Science Park, Jinian, Shandong, the control scheme for solar energy photovoltaic power generation project was researched. 

Influence analysis of excitation system on the stability of the power grid based on singlemachine infinite bus power system

WANG Pingbo

2010, 32(4): 20-22.

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The excitation system is most important measure to ensure the generator normal operation and the power grid stable operation. Taking the singlemachine infinite bus power system as example, the influences of synchronous generator excitation system on the static stability and the transient stability of the power grid were studied; the relation between the type and the parameters of the excitation system and the critical fault clearing time of the electric power system was obtained by calculation, which has certain significance for enhancing the power grid stability.

Economical analysis and optimization for the operational of 135MW CFB boiler

CHEN Wencheng

2010, 32(4): 23-25.

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The operation conditions and existed problems of the 135MW CFB boiler in Jiawang Power Generation Corporation Limited of Shanghai Electric Power Company Limited were introduced. The problems of the coal grade variation, the air distribution, the bed pressure and temperature adjustment, the spray water quantity, the exhaust flue gas temperature and others were analyzed. The measures for ensuring the unit economical operation and the optimization suggestions were put forward.

Underexcitation operation test of domestic 300MW generator

SONG Xiaobo;ZHANG Hui

2010, 32(4): 26-28.

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The underexcitation operation of the generator is a method to regulate the reactive power of the power grid and to reduce the grid voltage. The underexcitation operation test scheme of #4 generator of Sanhe Power Generation Corporation Limited was introduced. Combining with the test data, several outstanding problems were analyzed; the necessity, the feasibility, the stability and the security of the generator underexcitation operation were demonstrated.

Test of line protection on load

LIU Xinchun

2010, 32(4): 29-30.

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Aiming at the problems occurred in design, erection and commissioning of 220kV substation line protection of Zhongning Power Generation Corporation Limited, combining with the working principle of protection devices, the contents of test on load and fault handling method were put forward.

Application of plasma ignition control technology in power plant

CAO Dinghua;LIU Shuanlian

2010, 32(4): 31-34.

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Considering the working principle of plasma, the structure characteristics, the demands of coal grade, the regulation of air distributing, the safety monitoring and other respect, the technical essentials of plasma ignition in cold state and temperatureincreasing control were discoursed. According to the practical application effects of the technology in Huadian Baotou Power Generation Corporation Limited, the experiences of plasma ignition and temperatureincreasing control technology, which is suitable for directfired plate mill with middlespeed and variable load, were summarized.

Performance analysis of T91/P91 steel and welding technology

LOU Jieyun

2010, 32(4): 35-38.

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It is selfevident that the metal material is very important for thermal power plants, it influences directly the unit service life and safety and economical operation. The chemical composition and main physical property of T91/P91 steel were introduced, and the mechanical property and oxidation corrosion resistance were analyzed. The welding technology and method of T91/P91 steel were given, and some problems needing further research were pointed out.

Reformation of protection circuit in emergency trip system

LIU Weixing

2010, 32(4): 39-41.

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This paper analyzed the potential safety hazard caused by the problem which the field outage signal of the emergency trip system (ETS) of #5 and #6 units in Meixian Power Plant was not separated with the protection switch. The pertinent solving method was put forward, and the security of the whole emergency trip system was enhanced.

Welding procedure of submerged automatic arc welding for large cylinder shell

LI Yuzhu;YU Hua

2010, 32(4): 42-44.

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Based on the welding procedure qualification test of submerged automatic arc welding for large cylinder shell, the structure features of the product and the technical difficult points were analyzed, and rational welding procedure code had been formulated. The practice result shows that the formulated welding code is rational and helpful for ensuring the product quality.

Analysis of faults in trial operation of DG490/13.73-Ⅱ2 CFB boiler

ZHANG Chunli

2010, 32(4): 45-47.

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The faults occurred during installation and commission of DG490/13.73-Ⅱ2 CFB boiler manufactured by Dongfang Boiler Factory were discussed, which include the pulverized coal leakage of coal feeder system, the jam of limestone feeder, the coking of furnace and refeeder, distortion and burning loss of ignition duct expansion joint, air leakage of air heater and others. Some typical accident examples, such as the boiler shutdown due to severe water shortage caused by blocking fault of filter screen of feed pump and secondary consumption in tail duct caused by serious overtemperature in economizer area, were introduced, and the reasons of the accidents were analyzed. The solving method and concrete measures to prevent the accidents were proposed, which can be used as reference for same units in erection and operation.
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Excitation system in two generators reformed model of Shanxi Shentou Second Power Plant and its application

HE Jing;MAO Lisen;LEI Qiantao

2010, 32(4): 48-51.

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Combining with the excitation system reformation of Shanxi Shentou Second Power Plant, an excitation regulating model, in which the NES-5100 microcomputer excitation regulator is cooperated with PLC logic control, was analyzed, and the excitation system in two generators reformed model and its features were introduced. 

Reason analysis on bush damage of turbine and preventive measures

LI Xiaojian;CAO Xiaodong;CAI Gaofeng

2010, 32(4): 52-53.

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The influence of turbine bush damage on safety operation of the unit was expounded; the main reasons of bush damage of turbine were analyzed; and the relevant preventive measures were put forward for reference.

Insulation performance detection of manualwrapped insulator in terminal of stator bar of internal water cooling generator using potential method

HUANG Zhongdong

2010, 32(4): 54-55.

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The measuring fundamentals of the shifting potential test for the stator bar terminal of the turbogenerator was introduced, the measuring method and matters needing attention were introduced too. The tests have been done for two 200MW water internal cooling generators. Many hidden dangers existed in the terminal insulation of the generators were found, and relevant measures were adopted; the safety and stable operation of the units were ensured.

Application of rocker style bearing in reformation of main bearing of DTM380/720 mill

HOU Zhicheng

2010, 32(4): 56-57.

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The bearing burnout fault was occurred frequently in mill B of boiler No.6 of Tianjin Junliangcheng Power Generation Corporation Limited. The reasons of main bearing burnout of mill were analyzed. Combining with the technical characteristics of rocker style main bearing, the reasons of adopting rocker style bearing were discoursed, and the concrete construction scheme was proposed. The economical efficiency after replacing the mill bearing and before that was compared and analyzed.

Reason analysis of oil leakage of 600MW generator and countermeasures

WANG Yong;LIU Jianfeng

2010, 32(4): 58-60.

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Combining with structure characteristics of singlering oil sealing system, the reasons of oil leakage of 600MW generator in a power plant were analyzed. The relevant prevention measures from respects of equipment structure, system operation and overhaul were put forward, which can be used as reference for operation and maintenance of oil sealing system of same units.
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Influence of value of gear pair side clearance in singledrum doublemotor drive type on synchronous operation

MA Xinyan;WEI Lifa;HU Meiling

2010, 32(4): 61-62.

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In adjustment of synchronization of singledrum doublemotor drive, the adjustment value of side clearance of the gear pair is different from that of singledrum singlemotor drive, and the side clearance of the gear pair must be enlarged properly to ensure the large gear and small gear to mesh correctly; and by adding the electrical compensation, the synchronization of doublemotor drive and synchronization of two hoisting points can be realized. 

Reason of oil level decline of generator sealing oil tank and treatment

ZHANG Tailin

2010, 32(4): 63-64.

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In operation of the 300MW unit of project phase II in Sichuan Guangan Power Generation Corporation Limited, the oil level of generator seal oil abnormally declined, the DC seal oil pump and the AC seal oil pump must be put into operation simultaneously to keep the normal oil pressure and oil level of the seal oil system. By faults seeking and the reasons analyzing, after some temporary measures were adopted, the seal oil system can keep in normal situation when only the AC seal oil pump are put into operation.

Noise abatement for cooling tower of power plant

JIANG Dagang;ZHANG Pengzhu

2010, 32(4): 65-69.

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Based on the noise source and noise propagation path control, the relevant technical measures were adopted in the newlybuilt cooling tower of Tianjin Junliangcheng Power Generation Corporation Limited to control the noise from the aspects of noise output, the propagation and the receiving, which has made the environment noise around the power plant to be in accordance with related control standards. 
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One integration technology of desulfurizationdenitrificationdust and smoketower

LI Xiangling

2010, 32(4): 70-73.

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bstract:The domestic and overseas one integration technology status quo of desulphurizationdenitrationdedusting and smoketower were introduced. The feasibility of one integration technology of desulphurizationdenitrationdedusting and smoketower was analyzed. Combining with our own national conditions, an allinone design scheme for the one integration technology of desulphurizationdenitrationdedusting and smoketower was put forward, which can realize zero emission finally, decrease the initial investment, reduce the area per kW and save energy.

Reason analysis and treatment measures for increment of flue gas desulfurization system resistance

PENG Yizao;GUO Fuming

2010, 32(4): 74-77.

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the problem of the resistance increase of flue gas system in units operation of Jiangsu Huadian Yangzhou Power Generation Corporation Limited was introduced, which would have influence on the system stable operation. The reason of the resistance increment of flue gas system was analyzed, and the relevant measures have been adopted, the flue gas system resistance has been decreased, and the energy consumption was reduced.

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