Integrated Intelligent Energy

Analysis on reason and action process of 500kV 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 tripout accidents of the YuanBa Line I, YuanBa Line II and YuanAn line I of Hunyuan 500kV switch station. The reasons of tripout 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 500kV transmission line

DONG Qiang

2013, 35(11): 3-5.

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Abstract:A tripout accidents of three 500kV 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 antiicing 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 YuanAn (YuanBa) lines and the insulators were analyzed. It was pointed out that the current PRTV coating can not prevent ice flashover effectively. A domestic newest antiicing coating material was introduced, and the feasibility to use the newest antiicing coating material in power plant was expounded.

Study on failure of fastening bolts of steam turbine under interaction of ratchettingcreep

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 nonzero average stress, the ratchetingcreep behaviour of the fastening bolts of the turbine cylinder may occur. Therefore, to research the damage development of the bolts during ratchetingcreep process is of important significance. The uniaxial ratchetingcreep rupture experiment was carried out for the nickel base alloy material Nimonic 80A at 550℃. The user selfdefined program, which is based on AbdelKarimOhno kinematic hardening criterion, was embedded into the finite element software Ansys, and the ratchetingcreep process of the bolt was simulated. The macroscopical deformation obtained by simulation was identical with experiment result. Under the ratchettingcreep 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 mediumsmall hydrojunctions.

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 nonlinear and timevarying 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 antiinterference 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 nondesigned 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 overcurrent 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 overcurrent 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 overcurrent protection, if the fault is judged as fault inside the generator region, then the compound voltage overcurrent protection will trip at setting delay; and if the fault is judged as fault outside the generator region, then the compound voltage overcurrent protection will trip at setting delay plus a short delay. Thus the selectivity problem of the generator compound voltage overcurrent 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 humanmachine 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 objectoriented 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 substationbased 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 offline 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 allaround modern management of equipment operation and maintenance.

Low NOx combustion technology of 9E gas turbine and application

XU Ming

2013, 35(11): 49-51.

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Abstract:The drytype lowpollution burner and the low NOx combustion technology were introduced. In the drytype lowpollution burner, which is installed on the 9E gas turbine, the conventional diffusion combustion mode was discarded and replaced by homogeneous phase premixed turbulent flame propagation combustion mode. For the nature gasfired unit, when the unit load is greater than 50% of rated load, the mass concentration of its NOx emission can be controlled below 37mg/m3, which is lower than 50mg/m3, which is the limit value specified in state standard.

Treatment measures of rapid change of water inlet valve opening on the deaerator of 600MW subcritical heatsupply unit

ZHAO Sihai, GE Guanjie

2013, 35(11): 52-53.

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Abstract:In a 600MW 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 highfrequency 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 highfrequency 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 thirdparty system through communication by the LC module was introduced. Arming at the problems of the Ovation system occurred in communication operation on thirdparty 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 fuelfired power generation for provincelevel 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 fuelfired power generation was introduced. The feasibility of the integrated operation management of hydraulic and fossil fuelfired 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 fuelfired 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 fuelfired power generation units and to avoid mutual suppression between the hydraulic and fossil fuelfired 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 fuelfired power generation, and this is of great significance for optimization operation of the hydraulic and fossil fuelfired power generation and maximization of entire benefit.

Analysis on antiexplosion technology of doubleended 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 1000MW 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 1000MW 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 50Hz 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 commonused 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 Coalfired 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 Coalfired 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 120MW 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 350MW unit

WU Henggang, WANG Zhongao

2013, 35(11): 82-83.

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Abstract:The treatment process of inferior sealing of the 350MW 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 electricbag filter

YI Zuyao

2013, 35(11): 84-86.

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Abstract:Electricbag 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 electricalbag filter is introduced, S7300 PLC is adopted for control system design. The hardware, software and program for control system are presented. And, software structure and function of humancomputer interaction based on PC is presented. It can increases the management level for electricbag 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 300MW 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 online 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 energysaving reformation of water cooling tower of 330MW 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 330MW unit in a power plant was introduced. The factors influencing on the efficiency of the water cooling tower were analyzed. An energysaving 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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