Integrated Intelligent Energy

Reliability analysis of bag filter in thermal power plant

WANG Lei;FU Qiwen;LU Zefeng

2010, 32(5): 1-3.

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Aiming at the characteristics of the flue gas of thermal power plant, the factors influencing on the reliability of the bag filter were discussed, and the solving methods were proposed. The working process of the bag filter, the measures for ensuring the dust removal efficiency, the harms of overtemperature and overpressure and spark of flue gas and relevant treatment method, the influence of filter air leakage on the bags, the reliability of the pneumatic valve set， the malfunction reason of the control system and the countermeasures were analyzed.

Reason analysis of lower desulphurization efficiency of 300MW unit and solving scheme

LIU Wei;GAO Hui;ZHANG Nan

2010, 32(5): 4-5.

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The desulphurization efficiency of unit number 3 and unit number 4 of Liaoning Huadian Tieling Power Generation Corporation Limited was lower. The problem was researched, and the factors influencing on the desulphurization efficiency were analyzed. Some relevant measures were adopted, and the desulphurization efficiency of the unit was increased obviously. 

Design and calculation of the reinforcing ribs for the flue of the FGD installation

HUO Huifang;GUAN Yanwen

2010, 32(5): 6-7.

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The excel sheet was used to formulate a computation system for the reinforcing ribs of the flue in FGD installation. Taking the FGD project of a 2×600MW unit of a power plant in Hubei as example, the computation and type selection analysis of the reinforcing ribs for the FGD flue were carried out. It is shown by the comparison and the practice that the computation system is reliable and easy to use.

Application of platetype SCR DeNOx catalyst in the high dust and high arsenic flue gas of coalfired power plant

LI Feng;YU Chengzhi;ZHANG Peng;Holger Michaelis

2010, 32(5): 8-11.

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From the structural point of view, the characteristics of the platetype catalyst were analyzed. Taking the catalyst selection and design of a DeNOx project as the example, the suitability of the platetype catalyst to the high dust and high arsenic flue gas condition in DeNOx system of coalfired power plants was expounded.

Technical characteristics of gantry hydraulic trashcleaning machine

MA Xinyan;HAN Jianbin

2010, 32(5): 12-13.

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The trashcleaning conditions of the Erjiang Hydropower Station of Gezhouba Hydraulic Project were introduced. Based on this, the technical characteristics of the gantry hydraulic trashcleaning machine were expounded. The trashcleaning machine has experienced the tests of four flood seasons since it was put into operation, and can satisfy the trashcleaning requirement of the hydropower station.

The characteristic simulated study of gas consumption for PG9171E gas turbine based on LS-SVM

CHEN Yonggang;

2010, 32(5): 14-17.

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Using the LS-SVM method, the high accuracy fit study of the gasconsumption characteristics of PG9171E gas turbine manufactured by CE was carried out. The result was compared with that obtained by the traditional least square method. It is shown by the simulation and the experiment result that under the conditions of the gas turbine with varying temperature and varying load, the fitted result of the gas consumption obtained by LS-SVM method is more accurate.
Key words:LS-SVM (Least Square-Support Vector Machine); gas turbine; gas consumption; characteristics analysis; modeling method

Discussion of vacuum correction method for heat rate test

SHI Yongfeng;CHANG Hao;CAO Xibin;NI Ding

2010, 32(5): 18-20.

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The thermodynamic performance test of steam turbine involves the heat rate correction. For the exhaust steam pressure correction of the correction items, the manufacturer and related standards all suggest to correct the vaccum to the designed value. But in this method, some problems existed in certain equipments and cool terminal of the unit were covered up, so certain deviation will occur in practical examine of gross heat rate of a unit. In this paper a new correction method was proposed, in which only the influence of environmental temperature should be corrected, the vacuum value corresponding to the current temperature of the circulating water should be used as designed vacuum value of the unit in calculation and analysis. This method is more closer to the practical heat rate of unit operation, and has more direct instructive significance for the power plant in the energy saving and consumption reduction.
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Study on communication scheme of electrical control system

LI Zhongming;YANG Xiaofan

2010, 32(5): 21-23.

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The advantages of the connection mode of ECS into DCS were analyzed. In order to meet the demands of the sequential control of DCS, it is necessary to enhance the realtime and the reliability of ECS. Based on the analysis of various kinds of fieldbus adopted in current ECS and its networking mode, the networking mode of the interval layer and the station controlled layer, which is suitable to the ECS communication scheme in the actual projects, the hardware configuration mode and the softawre functions of the communication management machine were proposed.
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Reason of accidental shutdown of the hydrogen generation system and treatment

JIANG Yong

2010, 32(5): 24-25.

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Taking the hydrogen generation equipment of 2×600MW unit of Sichuan Guangan Power Generation Corporation Limited as example, the reasons of the sudden stoppage of the hydrogen generation system during operation were analyzed, and relevant treatment methods were given. 

Reformation of oil compressor for ball valve of secondary hydropower station

HUANG Hanyun

2010, 32(5): 26-27.

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The designed capacity of the oil compressor of Yunnan Huadian Lushuihe Hydropower Plant was smaller and can not satisfy the demands of closing the ball valves of four units in same time. The current situation of the hydropower station was discoursed. The necessity and the feasibility of the oil compressor reformation were analyzed; and the methods of design calculation, installation and debug were given.

Analysis of the variance control technique used in reliability assessment of large power system

WANG Guoqing

2010, 32(5): 28-30.

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The MonteCarlo method has characteristics of flexibility and effectiveness and is widely used in reliability assessment of the power system. However, in order to enhance the calculation accuracy, the calculation time will increase greatly, and this restricts its application scope. The influences of various components in the system on the system reliability were evaluated. On this basis, a simple assessment algorithm was established. By purposive sampling, the components, which threaten the system reliability, were identified. The experiment and the analysis show that the algorithm has higher convergence speed; it can reduce the calculation time and enhance the calculation accuracy in same time. Then the algorithm is more universal.

Analysis of coasting operation of S109FA unit

FANG Wei;WANG Yanqing;YU Lifan

2010, 32(5): 31-33.

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The characteristics of S109FA unit were introduced, and the idling curve and idle time of a S109FA unit were counted. The factors influencing on the idling curve of S109FA unit were analyzed, and a suggestion of ‘unified the idle time standard of S109FA unit’ was put forward to provide reference for treatment of similar problems in similar units. 

Twospeed energysaving reformation of water circulating pump of the 630MW supercritical unit

ZHI Jianping;L Yamei

2010, 32(5): 34-37.

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The twospeed reformation and the operation situation of the water circulating pump of 630MW supercritical unit in Jiangsu Guoxin Yangzhou Power Generation Corporation Limited were introduced. After the reformation, the water flow can be adjusted by changing the motor speed in accordance with the season variation. The service power rate was reduced, and the obvious economic benefit was obtained.

Application of the field bus control technology in thermal power plant

MA Yumin

2010, 32(5): 38-40.

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The importance of the application of the field bus control technology in the thermal power plant is expounded from the angles of the digitized power plant and the physical and functional distribution of the control system. The technical characteristics of the field bus control technology were analyzed. The successful experiences of the field bus technology application in abroad thermal power plant were discoursed. Based on the situation of the domestic intelligent field devices, the design philosophy and the application scope of the field bus control technology used in domestic thermal power plant were put forward.

easures for preventive saturation of current transformer in relay protection devices

ZHOU Huanrong;CHEN Qi;LI Bingjun;SONG Yun

2010, 32(5): 41-43.

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In the power system and the large or medium generator transformer set with the voltage level higher than 35kV, the short circuit fault current often includes two components: one of them is the periodic component with the power frequency, and the other is aperiodic component, which is damped along with time (it called direct current component sometimes). This characteristics of the fault current are easily to cause saturation of the secondary windings of CT in protection devices, and further cause the protection incorrectly tripping or refusing to trip. The process and the reason of CT saturation were analyzed, and relevant protective measures were put forward, and the reliability of the protection was enhanced.

Discussion of the condensate pump configuration schemes for power and heat cogeneration unit

YUAN Xiongjun;LIU Li;HU Yizhang;ZHAO Yali

2010, 32(5): 44-46.

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The technical performance and the economical efficiency of several common configuration schemes of the condensate pump configuration for cogeneration unit were compared. The optimized configuration scheme of the condensate pump for cogeneration unit was proposed.

Influence of line fault reclosing on transformer differential protection

PENG Peng;LIANG Wei;YIN Cong;LU Zhigang

2010, 32(5): 47-50.

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The shortline fault was occurred in transformer No.0 of Wujiangdu Power Plant. After the fault was cleared, the line protection was reclosed into the fault point. The reason, which caused the transformer differential protection to act, was analyzed. The analysis shows that in certain reclose time, when the shortline fault occurred, the transformer differential protection could act in certain probability. The relevant solving measures were put forward.

Problems in vacuum pump system debug and solving methods

CHEN Le

2010, 32(5): 51-53.

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Combining with the field practical situation, the problems faced in the course of debug of vacuum pump system were analyzed. The relevant solving methods were proposed, and the vacuum pump operates normally.

Application of tinyoil ignition technology in 300MW boiler

ZHANG Mengmeng;DENG Chaoxu;CAO Haibo

2010, 32(5): 54-56.

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The principle of the tinyoil ignition technology was introduced, and the reformation scheme of the tinyoil ignition system of Yaomeng Power Generation Corporation Limited was described. The application circumstances of the tinyoil system in boiler cold start, in low load operation and in the process of shutdown with variable parameters were analyzed. Aiming at the problems occurred in practical application, the solving scheme was put forward. The reformation accumulated some experiences for the reformation of tinyoil system of similar units.

Application of microcomputer relay protection equipment in large pump station

QIAO Feng

2010, 32(5): 57-59.

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The problems existed in conventional relay protection equipment in the pump station of the Jinghui irrigation districts were analyzed. Combining with the practical application examples of the microcomputer relay protection equipment in the Jinghui irrigation district, the characteristics of the microcomputer relay protection equipment, such as the reliability, the sensitivity and others, were expounded; and some problems needing improvement and perfection were pointed out.

Steam sealing reformation for steam turbine of 600MW unit and comparison of economical efficiency

WANG Yong;YU Dechao

2010, 32(5): 60-62.

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To raise the efficiency of the three casings of the turbine and reduce the unit heat rate are the main tasks for power generation cost control of power plant. The turbine steam sealing reformation process in Hunan Huadian Changsha Power Generation Corporation Limited was described in this paper. It is demonstrated by calculation that the excellent economical benefit has been obtained after the reformation.

Analysis of operating condition of high efficiency filter and technical reformation scheme

LI Yuwei

2010, 32(5): 63-67.

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The operating principle, structure and working situation of high efficiency filter were discoursed, and the technical reformation scheme of high efficiency filter was introduced. The advantages and disadvantages of the high efficiency filter were analyzed, and the methods for solving the problems were put forward.

Reason analysis and treatment for the leakage of the highpressure superheater in heat recovery boiler of S109FA gas turbine

ZHAO Yong

2010, 32(5): 65-67.

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In the peak shaving operation mode of the heat recovery boiler of S109FA gas turbine in Hangzhou Huadian Banshan Power Generation Corporation Limited, some problems were exposed. This article introduced the leakage of #2 high pressure superheater in detail; analyzed the reasons of the leakage, and put forward the relevant reformation measures. After the reformation, the unit operates well.

Two types of new steel material for 660MW boiler and their welding process

CHEN Jiankang

2010, 32(5): 68-70.

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In supercritical units and ultrasupercritical units, the T92/P92 steel and Super 304 steel were more and more used. Referring domestic and abroad documents and materials, the developing process and the performances of T92/P92 steel and super 304 steel were introduced, the chemical compositions of the two steels were analyzed, and their welding process and welding method were discoursed. 

Reason analysis of blockage of desulphurization system GGH and countermeasures

ZHAO Hongwen

2010, 32(5): 71-73.

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The gasgas heater of the desulphurization system was blocked frequently, which seriously influences on the normal operation of the desulphurization system and becomes important problem influencing on the system operation rate. The reason of GGH blockage was analyzed, and solving method was proposed.

Lime hydration process in dry flue gas desulphurization

MA Junbiao;DENG Huipeng

2010, 32(5): 74-79.

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The basic principium of lime hydration process for dry flue gas desulphurization and the influence of input condition on the hydration reaction were introduced. The control range of some important parameters in hydration process, such as limewater ratio, water content and others, and the demand of quick lime quality were expounded. The technical principle and the operation situation of several hydration reactors, such as the circulating fluidized bed dry hydration reactor, the NID dry hydration reactor, the horizontaltype double shaft dry hydration reactor and the horizontaltype twostage dry hydration reactor, were compared with each other. The examples of several practical projects were analyzed, and some problems needing more attention were put forward, which can be used as reference for selection of lime hydration process in similar dry desulphurization system.
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