Integrated Intelligent Energy

Analysis on effects of combustion system reformation of 600MW pulverized coalfired boiler for much inferior coal blending

CHEN Kelu;ZHANG Lei;HUANG Chuanliang;LI Min;YOU Changfu

2013, 35(4): 1-4.

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The operation state of the combustion system and the reasons of occurred problems before the combustion system reformation were analyzed. Aiming at the situation of the coal market, which supplies much inferior coal and much coal kinds, the combustion system of the boiler was reformed, and better effects were obtained. The target, which is to fire the blending much inferior coal and there is not serious coking to form on the water wall and the platen superheater heating surface of the boiler, was realized. The safe and stable operation of the combustion system was ensured, and the overall economic performance of the boiler was improved.

Analysis on reason of higher output water temperature of HP heater in 600MW unit and countermeasures

PENG Bowei

2013, 35(4): 5-7.

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During running period of a 600MW supercritical unit, the temperature of output water of the HP heater was much higher than the designed value. The problem was analyzed from the operation system and the measuring circuit, and it was found that the reason of the higher temperature was that the temperature sensing element is not matched with the compensating wire in the measuring circuit, and the measured temperature value was incorrect. The temperature sensing element had been replaced, and the measured temperature became correct.

Finding and treatment of leakage points on stator coil of 600MW hydrogencooled generator

WANG Yujiong;LIU Xi

2013, 35(4): 8-9.

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here was inner leakage fault in stator coil of the 600MW hydrogencooled generator of Huadian International Zouxian Power Plant. By finding, it was confirmed that the leakage point is located in upper winding bar of slot No.31. The process of replacing the failed winding bar was described. The defect of water leakage of stator coil was eliminated successfully, which provides reference for treatment of similar faults.

Analysis on type selection of largescale gassteam combined cycle heat supply power plant

ZENG Rongpeng;ZHENG Shufang;XIE Libing

2013, 35(4): 10-13.

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The features of largescale gassteam combined cycle generator unit were introduced. Combining with practical example, the type selecting process of the combined cycle generator unit was analyzed. The influences of the unit capacity, the energy price and annual run hours of the unit on the investment payoff period were analyzed, which can be used as reference for unit type selection.

Analysis on adjust and control performance of assisted service system of hydropower plant

FENG Decai

2013, 35(4): 14-17.

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TThe main factors influencing on the performance of assisted service system of hydropower station were analyzed. The mutual influence of the primary frequency adjustment and the secondary frequency adjustment and coordinating measures were expounded. The key factors restricting the performance of assisted service system of hydropower plant were found. Relevant measures were put forward, and better effects were obtained.

Analysis on reason of current jump in short circuit test of MEC5330 excitation system

KANG Ruiwen

2013, 35(4): 18-20.

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The generator stator current jump phenomenon occurred in short circuit test of the generator transformer set caused by MEC5330 excitation system was introduced. The background and reason of the current jump phenomenon in test process and the influence of the current jump phenomenon on the generator transformer set were analyzed. Based on the analysis, the improvement idea and the improvement measures for the short circuit test of the generator transformer set were proposed, which provides reference for treating similar problems.

Development and application of intelligent control system for eliminating shed shaped coal caking in raw coal bunker

YANG Wenquan

2013, 35(4): 21-22.

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TThe phenomenon of shedshaped coal caking in raw coal bunker of Huadian Energy Mudanjiang Second Power Plant aggravates gradually for past few years. Aiming at this problem, the measures to solve the shedshaped coal caking in raw coal bunker in north cold area at winter were put forward. The material level sensors were redesigned and arranged to make them can monitor the material level in the coal bunker more accurately and to realize automatic alarm of high material level. The hydraulic control system and the coal loosening device were designed to make them can eliminate the shedshaped coal caking in the coal bunker dynamically at summer and suppress the frozen coal on the raw coal bunker wall at winter. The hightemperature and highpressure steam was used to cut the frozen coal, which can avoid the frozen coal to form large agglomerate. The PLC automatic control system was designed, by which the system can find and solve the problems itself automatically. So the safe and economic operation of the boiler was ensured.

Optimization of thermal control logic for variable frequency reformation of induced draft fan

LIU Yinqing

2013, 35(4): 23-25.

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Taking the variable frequency reformation of induced draft fans of units No.1 and No.3 in Guizhou Dafang Power Generation Company Limited as examples, the optimization of the thermal control logic for variable frequency reformation of induced draft fan was introduced. For the switchover onto 50Hz power supply from converter fault, a set of automatic bypass control logic was designed. The hot state test and the operation effect show that the designed control logic can control the furnace pressure well during state switchover process.

Fuel coal blending principle and combustion adjustment measures for coalfired boiler

SU Shige

2013, 35(4): 26-29.

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Aiming at the practical situation of present power generatingused coal market, combining with the features of the boiler showed when burning nondesigned coal kinds, the condition and principle of the fuel coal blending for boiler were put forward. The measures to decrease the attrition of the heating surface of the boiler and to prevent overtemperature on the tube wall under condition of nondesigned coal combustion were discussed, which are useful for safe and economical operation of the boiler.

Measures for reducing fly ash content of inferior coal combustion

HU Zhijie;GAO Yunjie

2013, 35(4): 30-32.

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In Huadian Qingdao Power Generation Company Limited, aiming at the characteristics of different kinds of coal, the asfired coal blending method was adopted to improve the economic efficiency of the unit. The influence of inferior coal component on boiler combustion was analyzed. Starting from the angle of reducing the fly ash content of combustion of inferior coal with low volatile content and low calorific value, the feasibility to reduce the fly ash content of inferior coal combustion in unit was discussed in depth. The measures to reduce the ash content were adopted, and better effect was obtained.

Feed water flow control strategy for supercritical oncethrough boiler

YANG Feiping

2013, 35(4): 33-36.

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The improper adjustment of feed water flow for supercritical oncethrough boiler became the important reason to lead unit outage. The feed water flow adjustment methods for oncethrough boiler under the wet state, the dry state and the transforming process of wet state to dry state were introduced in detail, and the matters needing attention in each period were presented, which can be used as reference for related personnel.

Analysis on hidden defects of protection trip circuit and improvement measures

LIU Bing

2013, 35(4): 37-39.

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Taking an abnormal damage of the protection device of a transformer caused by improper selfhold design of the protection outlet trip circuit as example, the reasons of the damage were analyzed, and the design defects of the same selfhold circuits were treated thoroughly. The correctness of the judge, the analysis and the problem treatment were verified by field analysis and simulation test. The results in this paper can be used as reference in maintenance of protection devices of similar generators and transformers put into operation earlier.

Method on startup of generator 390H with pressed air cooling instead of hydrogen cooling

TONG Xiang

2013, 35(4): 40-42.

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The reasons of the generator fault were introduced. It was expounded that in fault treatment process, the dynamic balance test of the generator must be carried out on the scene only, and in order to reduce the urgent repair time, it was decided to start the generator with pressed air cooling instead of hydrogen cooling and to carry out the dynamic balance test further, which is a method never adopted for the generator of 9F unit in our country. The practical result shows that the temperature of each part of the generator is normal, and the indexes are all in the standard range, and this means that the air cooling startup of generator 390H was successful; and better effect was obtained.

Analysis on reasons of overflow of expansion tank in closed cooling water system of thermal power plant

AN Jianxiong

2013, 35(4): 43-44.

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In a power plant, the overflow state existed in the expansion tank of the closed cooling water system for long time, and the makeup water percentage of the unit was higher. The method for finding the leakage point was expounded. The device existing leakage fault was replaced, and the makeup water percentage was decreased. The result in this paper provides reference for solving similar problems.

Analysis on reasons of increase of stator cooling water conductivity and improvement measures

MA Yanxin

2013, 35(4): 45-46.

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Aiming at the increase of stator cooling water conductivity of a 300MW heat supplying power generator unit, the reasons of increase of stator cooling water conductivity were analyzed. The problems existed in the stator cooling water system were founded carefully. The improvement measures were formulated. After the improvement measures were implemented, the stator cooling water conductivity was reduced obviously. The method presented in this paper can be used as reference for the same type units to treat similar problems.

Treatment of defect of steam extraction control valve of 9E gassteam combined cycle turbine

ZHANG Taishan;LU Shiwen;ZHU Wei

2013, 35(4): 47-49.

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The defects in design and manufacturing of the heatsupplying extraction control valve of the gassteam combined cycle turbine were analyzed. The reasons causing the transition connector screw rod of the piston rod of the hydraulic servomotor to bend during startup were found. The defects treatment concrete measures were given, and the normal operation of the extraction control valve was ensured.

Safe switchover of original chimney and temporary chimney of thermal power plant

SUN Puchun;LI Ning

2013, 35(4): 50-51.

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hen the chimney of a thermal power plant is corroded seriously, the unit and the wet desulphurization system will can not operate normally. During isolated repairing of the original chimney, to install a temporary chimney is needed. The safe switchover of the original chimney and the temporary chimney becomes major concern. The key technical link in safe switchover of the original chimney and the temporary chimney of Huadian International Zouxian Power Plant was introduced, and the problems encountered in switchover process were summarized, which can be used as reference for relevant technicians.

Analysis on pollution of continuous electrodialysis deionization device and regeneration process

JIANG Xiaohu;FU Shihai;SU Xuefeng

2013, 35(4): 52-54.

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he characteristics of continuous electrodialysis deionization technology were introduced. The relation between the continuous electrodialysis deionization technology and the full membrane treatment process was expounded. Based on this, the problems occurred in operation of the continuous electrodialysis deionization device were analyzed, and solving methods were put forward.

Variable frequency reformation of boiler induced draft fan and energysaving effect

LI Xiuzhong

2013, 35(4): 55-59.

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The necessity of variable frequency reformation of induced draft fan was introduced. The process of variable frequency reformation of boiler induced draft fan in Huadian International Laicheng Power Plant was expounded in detail. The energysaving effect of the reformation was verified. The stability and the reliability of operation of the highvoltage motor frequency converter will be improved to obtain better energysaving effect.

Conceptual design of flue gas residual heat utilization system for a power plant

CUI Chao;SHEN Yuhui

2013, 35(4): 60-62.

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The conceptual design of flue gas residual heat utilization project for a power plant was introduced. Based on thermodynamic calculation, the related technical and economical parameters of the scheme were analyzed, and the feasibility of the scheme was pointed out. To adopt the scheme can recover the residual heat in the flue gas of the power plant and reduce the fuel consumption significantly. The project can bring considerable economic benefit not only, but also can reduce the emissions of the greenhouse gas and acid gas and total suspended particulates.

Prospects for fly ash production of alumina at coal fired power plant

GUO Jianmin;GAO Rong;YUN Dongdong;WANG Qiang

2013, 35(4): 63-66.

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This paper mainly introduces the significance and a variety of techniques of alumina production by high aluminum content fly ash. It analyses the domestic bauxite resources and holds that the production of alumina by using fly ash has significant profit and promising procpect.

Optimized design of steam turbine room layout for biomass power plant

SUN Ping;ZHAO Yuan;CHENG Liangping

2013, 35(4): 67-68.

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In a 30MW biomass power plant, an optimized layout scheme of the steam turbine room had been adopted. Comparing with the layout form of steam turbine room in other domestic biomass power plants, the heat efficiency of the steam turbine and the utilization rate of the biomass energy were improved, and the occupied area and the volume of the steam turbine room were decreased, which shows favorable technical and economical performance of the layout scheme.

Comparative analysis on feedwater systems in secondary loop of pressurized water reactors AP1000 and improved M310

CHENG Jun;YANG Jianjun

2013, 35(4): 69-71.

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Taking the feed water systems in secondary loop of third generation AP1000 PWR and improved M310 PWR nuclear power plants as example, the configuration of the adjustment valve sets for feed water pump and the configuration of the main feed water pumps were compared. The advantages and disadvantages of the configuration of feed water system in secondary loop of the AP1000 nuclear power station were analyzed, which provides reference for independent design and construction of third generation nuclear power station.

Analysis on preoperational test of protection and safety monitoring system of AP1000 nuclear power plant

ZHANG Sicheng;XU Jiang

2013, 35(4): 72-75.

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In the AP1000 nuclear power plant, the protection and safety monitoring system (PMS) is a safety I&C system, which is designed based on the Common Q platform. Before the plant is put into operation, in order to ensure the PMS can satisfy the designed system function requirement, using the overlap test method, the PMS preoperational test was carried out. Combining with the structure and function of PMS, the PMS preoperational test was introduced and analyzed in this paper, which can be used as reference for preoperational test.

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