Integrated Intelligent Energy

Measures for slowing the blockage of GGH by deposited dust in thermal power plant

LI Jun

2010, 32(9): 1-4.

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The blockage of GGH by deposited dust of thermal power plant FGD system formed in long term operation seriously influence on the normal operation of the system and is harmful for energysaving and consumption reducing. In addition, serious blockage could damage the boost fan and cause the system accident tripping. The reasons of blockage of GGH by deposited dust in FGD system were analyzed, and some concrete measures for slowing the blockage of GGH by deposited dust were put forward.

Computation of wastewater discharge of limestonegypsum wet FGD system in thermal power plant

WU Chong;TAO Aiping

2010, 32(9): 5-6.

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The reason of desulphurization wastewater generation was analyzed. Three basic computation models for desulphurization waste water discharge computing were introduced. The application of these three computation models was illustrated by examples, and the computation results were analyzed. 

Application of new type flue gas heat exchanger in desulphurization system of coalfired power plant

ZHAI Songsen;SUN Huailin

2010, 32(9): 7-9.

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In the desulphurization system of coalfired power plant, the faults of the gasgasheater (GGH) are occurred frequently, such as the equipment corrosion, dust deposition, scaling and blockage; and the high consumption of electricity, steam and water; so it is the biggest factor influencing on the system operating rate. In recent years, in the new built power plants, the GGH was eliminated and replaced by wet chimney; but this causes some new problems, such as the pollution in the vicinity, the dropping of the anticorrosive materials of the chimney, the higher water consumption and so on. In order to better develop the functions of GGH, a reformation scheme of new type phasetransition heat exchanger was put forward, which provides a solving way for higheffective, lowconsumption and safe operation of desulphurization system. 

Operation factors affecting water balance of limestonegypsum wet flue gas desulphurization system

ZHONG Shanxia;ZHANG Yuming;SHEN Yuhui

2010, 32(9): 10-11.

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The water balance of limestonegypsum wet flue gas desulphurization system and its absorption tower was calculated according to different design conditions. The affecting factors of water balance in operation process were analyzed, and a reference for operation and management of desulphurization installation was provided.

Research on reclamation of dry desulphurization slag

REN Zhen

2010, 32(9): 12-14.

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According to the chemical composition and the physical properties of the desulphurization slag generated in dry desulphurization process, it was put forward that the dry desulphurization slag can be used as the main component of cementitious materials of highsulfur ash. Based on the research of its composition, structure and relevant physical and chemical properties, its characteristics were determined, and its reclamation way was proved preliminarily. The factors influenced on the stability and the oxidizability of the CaSO3 in the calcium sulfite type desulphurization slag were analyzed. The performance requirement and the economical rationality of the entire activation technology at normal temperature were researched. The rule and the mechanism of the inner reaction of the cementitious materials of highsulfur ash based on desulphurization slag were explored; and the optimized application theory and the technology control parameters of different desulphurization slag in related construction material production were studied, which provides technical foundation for effective utilization of the desulphurization slag. 

Reasons analysis and treatment method on the common faults of axial flow fan

CUI Zhoushi

2010, 32(9): 15-18.

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The primary air forced draft fans of the boiler No.1 and No.2 of Huadian Baotou Power Generation Corporation Limited are axial flow fans with movable vanes; the air flow and the wind pressure of the fans can be adjusted by changing the dip angles of the movable vanes; so the fans have high efficiency and are adjustable under the load variation in large range. The reasons of the common faults of the axial flow forced draft fan were analyzed, and after the relevant treatment measures were adopted, the better effects have been obtained.

Principle and application of the automatic voltage control system in power plant side

LIU Tiecheng

2010, 32(9): 19-24.

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The AVC substation in power plant side receives the instruction of power plantside 500kV bus from the AVC main station of province dispatch center through the remote terminal unit. After considering various restraint conditions sufficiently, the center control unit calculates relevant width of the control pulse, and sends the calculation result to the executing terminal of the AVC system. The executing terminal output the increase or decrease excitation signal to the DCS. The DCS gives the instruction to the excitation system to regulate the reactive power of the generator set. The reactive power output and the terminal voltage of the generator are influenced by the excitation current. When the excitation current varies, the reactive power output and the terminal voltage of the generator will increase or decrease with the variation of the excitation current; and by the transformer beside the generator, the bus voltage will increase or decrease. The increase or decrease of the excitation current can be realized by adjusting the settings of the excitation regulator (AVR).

Application of “System Optimization Analysis Program” in 300MW boiler with ‘W’shape flame

CAO Yang;MING Qiang;CHEN Tao;CHAO Xiaobo

2010, 32(9): 25-29.

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The application effects of the “System Optimization Analysis Program” in 300MW boiler with ‘W’shape flame were analyzed. Under the conditions of 100%ECR (economical continuous rating), 90%ECR, 83%ECR, 75%ECR and 53%ECR (peak shaving minimum load), the optimization experiments of the boiler performance were carried out, and the optimized operation curves of various loads were obtained. The optimized results shows that the optimization direction is correct; and it can be used as reference for the operation optimization of boilers No.2, No.3, No.4 and other boilers with the same combustion mode. 

Analysis of Influence of slag disposal system reformation on boiler outlet gas temperature

LIU San;LIU Bing

2010, 32(9): 30-32.

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The wet slag disposal system of boiler number 6 in Zouxian Power Plant had been reformed to be dry slag disposal system. After this reformation, the temperature of boiler outlet gas was increased. By comparing the relevant parameters before and after reformation with each other, the reason of outlet gas temperature increase was found, and concrete solving scheme and countermeasures were put forward.

Analysis on capacity enlargement characteristics of WGZ220/9.8-13 boiler

LI Youliang

2010, 32(9): 33-36.

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Through the experiment of enlarging the capacity of the WGZ220/9.8-13 boiler to 240t/h, the thermodynamic characteristics of the boiler after the capacity enlargement were known well basically. Some main problems occurred in experiment of capacity enlargement were analyzed, and relevant countermeasures were put forward.

Application of fieldbus control technology in 1000MW unit

MA Yumin;LIU Junliang;DUAN Nan

2010, 32(9): 37-40.

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The importance of application of the fieldbus control technology in thermal power plant was expounded, which is embodied in the digitalization of power plant, the reduction of power plant construction cost and the operation cost and other aspects. The application experiences of the fieldbus control technology in power plants at home and abroad were summarized. Aiming at the current situation of the domestic intelligent field devices, the design principle and the application scope of the fieldbus control technology applied in 1000MW unit were put forward, and the technical economical analysis was carried out.

Analysis on type selection method for steam condenser reformation

ZENG Shuo

2010, 32(9): 41-43.

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The functions of the condenser were introduced, and the calculation method of the condenser performance was given. Taking the type selection of the condenser for reformation in a power plant as example, the related parameters of six schemes given by the bidders were calculated and analyzed, and the conclusion for the condenser type selection was obtained.

Reason of vacuity decreasing of 150MW steam turbine unit and countermeasures

WEI Shengluan

2010, 32(9): 44-48.

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The vacuity of the 2×150MW unit of the Sichuan Huadian Panzhihua Sanwei Power Generation Corporation Limited was lower, and this caused the safety and the economical efficiency of the unit operation to be decreased. The problems existed in the manufacturing, the installation, the commissioning and the operation of the unit and the factors causing the vacuity of the unit decreasing were analyzed. The relevant countermeasures were put forward, so it is ensured that the unit operates safely and economically under rational back pressure. 
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New alignment method for minor axis connected Coupling

CHEN Qiyin;JIANG Yinong

2010, 32(9): 49-51.

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The traditional alignment method for minor axisconnected coupling was introduced. The problems existing in traditional alignment method were analyzed, and their crucial reasons were found out. The correct method, which can eliminate the defects of the traditional alignment method, was put forward.

Reason of larger vibration of No.3 bearing shell in S109FA combined cycle unit and treatment

MAO Huajun

2010, 32(9): 52-54.

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The problem of No.3 bearing shell larger vibration of S109FA gassteam combined cycle unit often occurred. The reason of the larger vibration was analyzed. The adopted solving scheme and the obtained effects were introduced, providing reference for similar problem treatment.

Analysis on reasons of water leakage in rotor of dual internal cooling turbine generator and preventive measures

ZHOU Bo;ZHOU Xianzhi

2010, 32(9): 55-56.

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The rotor cooling water system of the dual internal water cooling turbine generator was introduced. The reasons of leakage of rotor cooling water of dual internal water cooling turbine generator were analyzed. The measures for prevention of water leakage in erection and operation process were put forward.

Solution of rubber belt deformation in corner of inclined belt conveyor

SONG Qiang

2010, 32(9): 57-58.

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In the Baotou Power Generation Branch of Huadian Inner Mongolia Energy Corporation Limited, the deformation and wrinkling of the rubber belt of the inclined belt conveyors No.5 and No.6 in the coal handling system were occurred, which influenced on normal operation of the equipments seriously. By analysis and reformation, the problems were solved finally, the service life of the rubber belt was lengthened, and the normal conveying, receiving and unloading of the coal were ensured. 

Analysis of reason of S109FA combined cycle unit steam turbine runback

WU Fan

2010, 32(9): 59-60.

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The situation of steam turbine runback of S109FA gassteam combined cycle unit was introduced. Various possible reasons of runback were analyzed. The effective methods for solving the problem were proposed to provide reference for other S109FA units in similar problem treatment.

Reasons and countermeasures of passline deflection of cylinder

YE Xicheng

2010, 32(9): 61-62.

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The blade of steam turbine of a power plant was broken, and its gland seal was worn down. The reasons of these faults were analyzed; and the treatment methods were introduced. It was pointed out that must pay sufficient attention to the inspection of the slide key system in erection and overhaul of the steam turbine. 

Reasons of discharging and firing of the generator stator bar during highvoltage holding test and the countermeasures

YANG Kaiping;HAN Guofeng;LIANG Guanghui

2010, 32(9): 63-64.

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The reasons of discharging and firing of the generator No.5 stator bar of Danjiangkou Power Plant during the highvoltage holding test were analyzed. The concrete treatment scheme and the practical effects of the scheme were introduced. After the anticorona layer of the bar was treated using correct technology, the safe and reliable operation of the unit can be ensured.

Analysis on leakage reasons of high pressure heater in 600MW supercritical turbine

MA Shidong;YUAN Hongtao

2010, 32(9): 65-67.

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After the 600MW supercritical unit was put into commercial operation, the leakage was occurred in high pressure heater pipeline. Various factors, which may causing leakage of high pressure heater, were analyzed, and it was pointed out that the main reasons are the high temperature corrosion and the thermal shock of the pipelines. Aiming at the problems existed in supervision and maintenance in operation and the startup and shutdown of the high pressure heater, the solving scheme and preventive measures were put forward. The leakage of the high pressure heater was prevented effectively, and safe, stable and economical operation of the high pressure heater was ensured.

Analysis of gateway energy metering error and technical reformation practice

ZHANG Haifeng;MING Qiang;ZHU Qihua;YU Kaihong

2010, 32(9): 68-70.

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Aiming at the abnormal metering error of gateway metering system, the reasons caused the abnormal error were analyzed in depth, and the potential problems were investigated from different respects. Some improvement measures were adopted, which include adding a set of special current transformers (CT), testing the comprehensive error of the voltage transformers (PT), installing the gateway metering box near with the voltage transformers to reduce the secondary voltage drop of PT and others. Then the abnormal metering error, which existed in long term, had been eliminated, and large amount of economical losses was retrieved. 

Calculation of conserved energy of equipments after energy conservation reformation

WU Tao

2010, 32(9): 71-74.

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By the research on the calculation method of conserved energy of equipments after energy conservation reformations, which include reformation of the control system of the electrostatic precipitator, adding the frequency converter for motor, the dualspeed reformation for water circulating pump, reformation of the gland seal for steam turbine and others, the energy conservation quantitative management of the power generation enterprises were standardized and strengthened, which is useful for the postassessment of the energy conservation reformation. 

Analysis on NOx emission of boilers No.5 and No.6 in Mawan Electric Power Corporation Limited

HE Lingzhi;MEI Lin

2010, 32(9): 75-77.

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The generation mechanism of NOx was introduced. The successful experience on reducing the NOx emission of boilers No.5 and No.6 in Mawan Electric Power Corporation Limited was analyzed. It was put forward that when the technical reformation could not be carry out provisionally, the mass concentration of the NOx emission can be reduced by the coal grade regulation and the operation adjustment. 

Flue gas pollution control technique using activated coke dry method and developing of activated coke from lignite

ZOU Yan;LI Xiaoyun;MENG Hui

2010, 32(9): 78-82.

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The principle of dry method flue gas integrated purification technology using lignite activated coke was introduced. The development research (including the raw material selection, the manufacturing process，the properties of the products etc.) and application for lignite activated coke with relative lower price were expounded. The main research contents and the obtained results of the lignite activated coke in China were analyzed. At last, it was pointed out emphatically that one of the key problems for application and dissemination of the flue gas purification technology using activated coke is to reduce the cost of the activated coke. 

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