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Table of Content
25 November 2013, Volume 35 Issue 11
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Analysis on reason and action process of 500kV line tripping DAI Shuqin
DAI Shuqin
2013, 35(11): 1-2.
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Abstract:The rain and snow weather caused the transmission line tripout accidents of the YuanBa Line I, YuanBa Line II and YuanAn line I of Hunyuan 500kV switch station. The reasons of tripout accidents and the tripping process were analyzed. Effective countermeasures were adopted so as to ensure the generator units of Inner Mongolia Datang International Togtoh Power Generation Company Limited to operate safely as far as possible.
Influence of voltage surge on frequency converter during trial transmitting power into 500kV transmission line
DONG Qiang
2013, 35(11): 3-5.
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Abstract:A tripout accidents of three 500kV output transmission lines of Togtoh Power Generation Company Limited occurred successively, four units were compelled to shut down urgently. The influence of voltage surge on the variable frequency equipments during trial transmitting power into the transmission line was expounded. The reasons of frequency converter tripping and the harm of the frequency converter tripping were analyzed. Concrete preventive measures were put forward so as to ensure the power system to operate safely and stably.
Emergency disposal scheme of coal handling system of power plant during sudden accident
LAN Yu
2013, 35(11): 6-7.
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Abstract:Due to heavy snowfall in wide area of North China, three output transmission lines of Togtoh Power Generation Company Limited tripped successively, four power units were compelled to shut down urgently. According to the actual situation of sudden accident of the power plant, the professionals of coal handling system formulated an accident emergency proposal scheme and tried their best to ensure the equipments of coal handling system to operate safely and stably.
Icing harm to transmission line and feasibility to adopt new antiicing coating material
XU Xiaoming
2013, 35(11): 8-9.
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Abstract:Combining with the “11.5” accident, the reasons of transmission line icing and its damage to the YuanAn (YuanBa) lines and the insulators were analyzed. It was pointed out that the current PRTV coating can not prevent ice flashover effectively. A domestic newest antiicing coating material was introduced, and the feasibility to use the newest antiicing coating material in power plant was expounded.
Study on failure of fastening bolts of steam turbine under interaction of ratchettingcreep
ZHANG Miao, YUAN Xinyong
2013, 35(11): 10-12.
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Abstract:When the unit load is changing or the unit operates in peak shaving process, under the action of alternately changing load with nonzero average stress, the ratchetingcreep behaviour of the fastening bolts of the turbine cylinder may occur. Therefore, to research the damage development of the bolts during ratchetingcreep process is of important significance. The uniaxial ratchetingcreep rupture experiment was carried out for the nickel base alloy material Nimonic 80A at 550℃. The user selfdefined program, which is based on AbdelKarimOhno kinematic hardening criterion, was embedded into the finite element software Ansys, and the ratchetingcreep process of the bolt was simulated. The macroscopical deformation obtained by simulation was identical with experiment result. Under the ratchettingcreep interaction, the damage development speed of the screw rod of the bolt is greater than that of the thread of the bolt, which is the region of stress concentration, and the rupture may occur there.
Analysis on lifting principle and characteristics of hydraulic lifting ship lifter
NI Jia, JIANG Chunxiang, SONG Yuanzhuo
2013, 35(11): 13-16.
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Abstract:In order to satisfy the special requirement of the ship lifter dedicated for tourist passenger transport in urban river system connectivity project, a hydraulic lifting ship lifter was proposed. Combining with the urban river system connectivity project of Chizhou, the navigation capacity and the equipment composition of the hydraulic lifting ship lifter were introduced, and the lifting principle and application features of the lifter were analyzed. The result shows that comparing with traditional ship lifters the hydraulic lifting ship lifter has several advantages, which include the simple drive system, the high security, the superior shock resistance, the easy synchronization, the lower cost and so on. The ship lifter can satisfy the requirements of security and stability, and at the same time, it can meet the requirement of urban landscape construction. So the ship lifter is suitable for navigation of urban river system connectivity projects and mediumsmall hydrojunctions.
Analysis on equipment maintenance layout scheme of turbine operating floor in Sanmen Nuclear Power Plant
CHEN Chaojun, REN Jiankang
2013, 35(11): 17-21.
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Abstract:The turbine cylinder of AP1000 unit of Sanmen Nuclear Power Company Limited has large size, and its rotator mass is large. Some partial regions of the operating floor must be able to bear larger local load during the steam turbine overhaul. According to the overhaul situation of the turbine of unit No.1, when which was disassembled overall, combining with the floor slab design data of the operating floor and the characteristics of the equipments, the relevant load uniform distribution measures were adopted to satisfy the requirement of equipment stacking. The scheme can ensure safety of whole platform and improve the overhaul efficiency.
Realization of model algorithm control in coal mill load control system
LIU Ziyuan, MA Ping
2013, 35(11): 22-25.
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Abstract:The control object of the coal mill load control system is typical nonlinear and timevarying system with large lag, and it is more difficult to obtain better control result by conventional control method. Based on the advantages of the prediction control in solving complex and barely controllable objects, a model algorithm control (MAC) scheme was proposed and used to solve the problem of coal mill load control. The simulation result shows that under conditions of the model parameters variation, the internal perturbation and the setting destabilization, the stability, the robustness and the antiinterference performance of the model algorithm control are all superior to that of conventional PID control. At last, based on the simulation result, an applicable for practical engineering model algorithm control design scheme was put forward, which can be used in power plant operation when certain conditions are available.
Development and application of multiple coal grades blending software for thermal power plant
FANG Zhanzheng 1, HUANG Xiaobin 2, LIANG Longfei 2, ZHANG Peichao 2, WANG Xueru 2
2013, 35(11): 26-29.
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Abstract:In practical operation of a power plant, a certain percentage of nondesigned coal may be blended with the designed coal and burned. Taking multiple coal grades blending in a power plant in Shanxi as research object, the influence of coal blending with different blend ratio on the generating cost was analyzed. The enumeration method was used to search the optimal blend scheme, and a best blend ratio for multiple coal grades blending was obtained by calculation. Based on this, a practical multiple coal grades blending software system was developed, and it is able to reduce the fuel cost and to improve the economic efficiency of the power plant by this software.
Control strategy of turbine performance test of thermal power plant
MA Yong 1,2,ZHU Litong 1, FU Chang 1, BIAN Jing 3
2013, 35(11): 30-32.
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Abstract:The automatic control system of thermal power unit was introduced. Several conditions of turbine performance test, such as to keep the valve fully opened, to keep valve opening to be constant, to maintain high back pressure, to cut off high pressure heater and so on, were analyzed, and relevant control measures were put forward, which provide guidance for operators and performance testing engineers of power plant in both theory and practice.
Research on selective compound voltage overcurrent protection for generators in expanded unit connection
LI Ling 1, CHEN Jun 2
2013, 35(11): 33-34.
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Abstract:When the current generator compound voltage overcurrent protection is used for generators in expanded unit connection, it does not possess desired selectivity for failed generator. Based on the principle of asynchronous method selective generator compound voltage overcurrent protection, if the fault is judged as fault inside the generator region, then the compound voltage overcurrent protection will trip at setting delay; and if the fault is judged as fault outside the generator region, then the compound voltage overcurrent protection will trip at setting delay plus a short delay. Thus the selectivity problem of the generator compound voltage overcurrent protection used in expanded unit connection was solved effectively. The availability of the scheme was verified by the result of dynamic simulation experiment.
Design and realization of wind power control system based on Android mobile terminal
LI Chao, SHI Jianting, SUN Feng, TONG Yuhao
2013, 35(11): 35-38.
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Abstract:The hierarchical structure of the Android platform and the whole structure of the wind power control system were introduced. The design and realization processes of various function modules of the system were analyzed. The system was tested repeatedly on HTCS710e mobile phone and Motolola Xoom tablet PC, and the test result shows that the system can operate stably, its humanmachine interaction interface is friendly, and the detection and controlling of the wind power equipments can be accomplished basically by the system.
Optimization of pressure setting at inlet of turbine
WANG Qingjin, LI Xinjian
2013, 35(11): 39-40.
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Abstract:The definitions of performance indexes of power unit were given. The feasibility to increase the load variation rate of power unit was expounded. The reason of optimization of the pressure setting at inlet of the turbine was analyzed, and the optimization scheme was put forward. Based on guarantee of sliding pressure at all variable range, the pressure setting at inlet of the turbine was optimized, and the balance point was found, at which the stability of the unit pressure can be ensured, and the requirement of the power grid about higher load variation rate can be satisfied too.
Diagnosis of faults of distributed system based on intelligent integrated information platform
SUN Yunli
2013, 35(11): 41-44.
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Abstract:A fault diagnosis system for distributed system based on integrated information platform of intelligent substation was proposed. The diagnosis system mainly composed of the alarm receiving and processing module and the online fault diagnosis module. The alarm processing module will capture the signal of GOOSE (general objectoriented substation event) from the GOOSE network, but does not read traditional SCADA (supervisory control and data acquisition) information. The system fault diagnosis, which was implemented in dispatch side traditionally, will be divided into a series of single substationbased fault diagnosis, and the latter will be implemented in relevant substation. In each substation, using the system configuration description file (SCD) provided by the information platform, the system fault diagnosis analytical model will be established. The examples show that the diagnosis method has advantages of high speed and accuracy and can meet the requirement of online application.
Application of vibration analysis technology in rotating machineries of thermal power plant
ZI Juan, ZHAO Yantao,ZHANG Anxin, WAHG Zhijie
2013, 35(11): 45-48.
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Abstract:The principle and application foundation of CSI 2130 offline vibration analyzer were introduced. The monitored parameters and the fault diagnosis process were analyzed. The results in this paper provide technical base for realization of allaround modern management of equipment operation and maintenance.
Low NOx combustion technology of 9E gas turbine and application
XU Ming
2013, 35(11): 49-51.
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Abstract:The drytype lowpollution burner and the low NOx combustion technology were introduced. In the drytype lowpollution burner, which is installed on the 9E gas turbine, the conventional diffusion combustion mode was discarded and replaced by homogeneous phase premixed turbulent flame propagation combustion mode. For the nature gasfired unit, when the unit load is greater than 50% of rated load, the mass concentration of its NOx emission can be controlled below 37mg/m3, which is lower than 50mg/m3, which is the limit value specified in state standard.
Treatment measures of rapid change of water inlet valve opening on the deaerator of 600MW subcritical heatsupply unit
ZHAO Sihai, GE Guanjie
2013, 35(11): 52-53.
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Abstract:In a 600MW unit, the opening of the water inlet adjusting valve on the deaerator changed rapidly due to serious reduction of the condensate water flow, the automatic water level adjustment function had not been realized, and the positioner was damaged repeatedly due to the highfrequency vibration of the pipeline. The reasons of vibration of the condensate pipeline were analyzed. The reformation scheme was proposed. After the reformation, the rapid change fault of the opening of the water inlet adjustment valve caused by reduction of the condensate water flow did not occur again, and the highfrequency vibration of the pipeline was eliminated.
Strategy of Ovation system in operating third party system through communication by link controller (LC) module
GUO Bochun 1, XIAO Sheng 2
2013, 35(11): 54-57.
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Abstract:Taking the communication reformation of the periodic blow down program control system in Sichuan Guang’an Power Generation Company Limited as an example, the operation process of Ovation system to use the Modbus protocol to operate the thirdparty system through communication by the LC module was introduced. Arming at the problems of the Ovation system occurred in communication operation on thirdparty system by the LC module, which include the communication address error, the repeatedly sent instructions, the disorder operation results and others, considering three aspects (the Modbus protocol address matching, the configuration of the LC module and the logic configuration of Ovation system are included), the problems needing attention and the solutions in communication operation design of Ovation system by LC module were expounded.
Principle of blade angle adjustment of circulating water pump in AP1000 unit and adjusting method
LIAO Changcheng, YANG Andong
2013, 35(11): 58-61.
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Abstract:The basic situation of the circulating water pump of AP1000 nuclear power unit was introduced. The blade angle adjustment mechanism of the water circulating pump, the adjustment principle and the adjusting method of the blade control unit were expounded. The reasons of faults of the blade control mechanism occurred in commissioning and operation period were analyzed, and the preventive measures were proposed.
“11.5” accident of Togtoh Power Generation Company Limited and stable combustion of boiler under low load
LI Leyi
2013, 35(11): 62-63.
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Key words:low load; stable combustion; principle; accident
Discussion on integrated operation management of hydraulic and fossil fuelfired power generation for provincelevel regional power generation company
HE Guanghong
2013, 35(11): 64-66.
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Abstract:The concept of integrated operation management of hydraulic and fossil fuelfired power generation was introduced. The feasibility of the integrated operation management of hydraulic and fossil fuelfired power generation was analyzed. Considering the requirement of the power grid, the coming water flow of the basin, the coal market and other factors comprehensively, the management idea of integrated operation of hydraulic and fossil fuelfired power generation was put forward. By the management idea, it is able to realize rational dispatch of the operating time and the share of power generation of hydraulic and fossil fuelfired power generation units and to avoid mutual suppression between the hydraulic and fossil fuelfired power generation units of the same company, which is helpful to improve the water energy utilization rate of hydropower generation and reduce the fuel cost of fossil fuelfired power generation, and this is of great significance for optimization operation of the hydraulic and fossil fuelfired power generation and maximization of entire benefit.
Analysis on antiexplosion technology of doubleended ball mill when pulverizing lignite
ZHANG Jinsong
2013, 35(11): 67-69.
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Abstract:According to the characteristics of double inlet and double outlet coal mill, combining with pulverized coal deflagration theory, the principle of explosion of pulverized coal, which probably occurs in a double inlet and double outlet coal mill when pulverizing lignite, and the factors influencing on the explosion accident were analyzed. The concrete measures for preventing explosion of coal pulverizing system were put forward. The probability of explosion accident was decreased effectively, and the safety of the operation was improved.
Treatment of vibration of 1000MW unit condensate pump after variable frequency reformation
WANG Hui, CHEN Zhenbo, LI Jun
2013, 35(11): 70-71.
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Abstract:Taking the 1000MW unit of Guangdong Datang International Chaozhou Power Generation Company Limited as example, the treatment process of resonance of the condensate pump after its driving power source had been changed to variable frequency power source instead of 50Hz power source was expounded. Effective solving way was point out, which provides guarantee for condensate pump to operate safely, reliably and continuously in long period.
Study on interpolation algorithm for intelligent substation
SUN Beijun, LI Shuai, DING Quan
2013, 35(11): 72-75.
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Abstract:The fundamental of the interpolation algorithm commonused for intelligent substation was introduced. The error of the amplitude and the deviation of the phase angle of the interpolation algorithm were analyzed. The correctness of the theoretic analysis had been verified by simulation. Combining with related applications, the concrete implementation method of the algorithm was given, which provides reference for both engineering practice and theoretic research.
Transmission line distance protection test for BATAM Coalfired Power Plant in Indonesia
CHEN Wei
2013, 35(11): 76-78.
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Abstract:According to the features of transmission line protection of oversea power grid, following with the principle of taking actions that suit local circumstances, the configuration and test of the transmission line distance protection for BATAM KASAM Coalfired Power Plant, which is the first oversea project of China Huadian Engineering Corporation, were researched. Starting from the configuration principle of transmission line distance protection, the different principles of domestic line distance protection and oversea line distance protection were analyzed emphatically, and the solution of the transmission line distance protection for oversea power grids was obtained, which provides reference for other oversea projects.
Methods for decreasing water consumption of air cooling device of 120MW hydropower unit
XU Guohua
2013, 35(11): 79-81.
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Abstract:The cooling mode and cooling principle of the generator of unit No.5 in Hunanzhen Hydropower Station were introduced. The current situation of the water consumption of the air cooling device of unit No.5 was analyzed. The methods for decreasing the water consumption were given and verified, and the favorable effects of the methods are recognized.
Analysis of case and treatment of inferior sealing of vacuum system of 350MW unit
WU Henggang, WANG Zhongao
2013, 35(11): 82-83.
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Abstract:The treatment process of inferior sealing of the 350MW unit vacuum system of a power plant was introduced. The conventional treatment mode of vacuum system sealing was analyzed. The result in this paper provides reference for other units to treat similar problems.
The design and implement of control system for electricbag filter
YI Zuyao
2013, 35(11): 84-86.
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Abstract:Electricbag compound dust is a major innovation in gas dust removal technology, the emission of flue dust can be lower and it has significant energy efficiency. The voltage control equipment for electricalbag filter is introduced, S7300 PLC is adopted for control system design. The hardware, software and program for control system are presented. And, software structure and function of humancomputer interaction based on PC is presented. It can increases the management level for electricbag compound dust.
Analysis on safe operation of station service power system of a pumped storage power plant
KE Zhijian
2013, 35(11): 87-89.
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Abstract:Starting from the viewpoint of station service power system switchover and safe operation, the logic and test of the standby power source automatic switchover device of station service power system were analyzed. Combining with the operating conditions of the station service power system after it was put into operation, the matters needing attention for safe operation of the station service power system were put forward to ensure the station service power system to operate safely.
The impact of water side fouling coefficient in heat pump unit on the project economic of waste heat utilization in power plant
DAI Jun 1,ZHOU Chongbo 2
2013, 35(11): 90-92.
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Abstract:For the actual situation of waste heat utilization project with circulating water in 300MW unit of some power plant, we studies and analyzes the influence of two different fouling coefficients on the project economic benefit. The research results show that blindly choosing big fouling coefficient does not promote the project economic benefit based on river water quality used in this project. Through experiments, we preliminarily explore the feasibility of online cleaning in real time by using rubber ball cleaning system for the absorption heat pump units. The experiment results show that the cleaning effect is more obvious.
Comprehensive energysaving reformation of water cooling tower of 330MW unit
WANG Chunliang，WANG Bin
2013, 35(11): 93-94.
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Abstract:The operation situation of the circulating water system of the 330MW unit in a power plant was introduced. The factors influencing on the efficiency of the water cooling tower were analyzed. An energysaving reformation method was proposed, in which two water cooling towers will be used for one power unit. The scheme had been test in production site. In the test, one of the two units is operating alone, and the water cooling tower of other standby unit was used parallel with that of the operating unit. The test result shows that the cooling capacity of the water cooling tower of standby unit was used to increase the cooling area, and the efficiency of the operating unit was enhanced.
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