Integrated Intelligent Energy

Application of XDPS-400 distributed control system in limestone wet desulphurization system

PENG Guiyun;SUN Qingjun;TIAN Qiuyun;ZHOU Genlai

2010, 32(8): 1-4.

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According to the technical characteristics and the control target of the flue gas desulphurization equipment, aiming at the desulphurization equipment of a power plant, the system configuration and the external communication interfaces based on XDPS-400 distributed control system were introduced. The realization ways of the sequential control and the analog variables control in the desulphurization process were expounded, and the application results of the control system were summarized. 

Digital filter design method for controlling system of APF

SHEN Xiaoqing

2010, 32(8): 5-8.

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Active power filter (APF) control system needs excellent lowpass or bandpass digital filter. By comparing the traditional digital filter with wavelet filter, and after analyzing the fast fourier transform fast wavelet transformation, we systematically give a series of thoughts and the methods of design digital filter specially for active power filter control system. Detailed calculation example is given also.

Inherent frequency modulation technology and its influence on coordinate control system

FAN Haidong;TANG Longsheng

2010, 32(8): 9-11.

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The related parameters and the main performances of inherent frequency modulation of oncethrough boiler were introduced. The influence factors of the inherent frequency modulation on the coordinate control system (CCS) of the power generator set were analyzed. The way and the method to enhance the performance of the inherent frequency modulation were discussed.

Static load ageing test for residual stress of space truss metal gate with large span

MA Xiaoming;YU Manye;JIANG Jianguo;YE Jing

2010, 32(8): 12-14.

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Considering the special structure of space truss metal gate with large span for resisting the tide and discharging the flood in the Caoejiang River, an aging scheme was designed and implemented, in which the space truss metal gate first suffered the natural aging from solarization in the summers sun shine for 90 days; then, using the small tide of the Qiantangjiang River, the gate suffered the aging under static load to eliminate the residual stress. The residual stress was measured by the blind hole method, the residual stress eliminating effects of the natural aging and the static load aging were tracked. So the entire safe aging of the gate leaf was realized.

Analysis on type selection of combined induced draft fan for 600MW supercritical unit

YAN Guilin

2010, 32(8): 15-17.

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From the perspective of the economical operation, the adjustment efficiency, the equipment cost, the maintenance cost and the reliability of the fan, the movingvane adjustable axial flow fan had been compared with the staticvane adjustable axial flow fan. According to the analysis of type selection of combined induced draft fan, the type selection result of the fan suitable to the practical situation of the Maoming Cogeneration Plant was obtained.

Analysis on ensuring availability rate and utilization rate of 600MW unit

FANG Lian;LI Ou

2010, 32(8): 18-22.

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The main reasons of the unplanned outage of the main and auxiliary equipments in power plant were analyzed, and the prepared schemes of main systems were researched. Based on these, the scheme was put forward, which can ensure the availability rate of the 600MW unit to be not less than 95% and the utilization rate to be not less than 80%. 

Design features of hydraulic trash remover in Shanxiu Hydropower Station

HU Jian;HAN Jianbin;LI Yong

2010, 32(8): 23-24.

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The overview and the design parameters of the hydraulic trash remover in Shanxiu Hydropower Station were introduced. The composition, the working principle and the electrical control of the hydraulic trash remover were expounded. After the hydraulic trash remover was put into operation, its operation is favorable, and its safety and reliability attained the design objectives. 

A method for increasing vacuum of condenser

ZENG Hua

2010, 32(8): 25-29.

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A cooler was installed on the pipe between the condenser and the vacuum pump; and when the outlet temperature (air side) of the cooler can remain in about 15℃, the condenser vacuity could approach the limit vacuum of the vacuum pump. In the summer, after the cooler was put in operation, the condenser vacuity increased by 1.6%; and in winter, after the cooler was put in operation, the condenser vacuity increased by 0.57%. Adoption of the method has gotten favorable economical and social benefits. 

Parameter adjustment method during turbine rolling in oilfree startup of coalfired unit

JU Wenfei

2010, 32(8): 30-31.

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In the first startup of the unit No.1 of the Anhui Huadian Suzhou Power Generation Corporation Limited, due to the operators had not sufficient experiences about the plasma oilfree ignition, the amplitude of the adjustment was overlarge, which leaded the variation of the parameters of the main steam was overlarge, and further caused the low pressure differential expansion to be larger and to cause tripping. The reasons of the tripping were analyzed; the adjustment method was improved, so the turbine rolling in the second startup of the unit was successful.

Application of elastic damping vibration absorber in reformation of recirculation pipe of feed pump for vibration attenuation

CAO Zhijun;CHEN Xuebin;LI Feng

2010, 32(8): 32-33.

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The working principle and the functions of the novel bidirectional elastic damping vibration absorber for pipe were expounded. The application of the elastic damping vibration absorber in the vibration attenuation treatment of the recirculation pipe of the feed pump of 50MW turbine generator set in the Heat and Power Cogeneration Plant of Laiwu Steel Group Corporation Limited was introduced. The success application of this device provides reference for other similar pipes in vibration fault treatment. 

Analysis of outoflimit of tube wall temperature in final superheater

LIU Xiaojun;XIAO Lizheng

2010, 32(8): 34-36.

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Since the 600MW supercritical boiler of the Hubei Huadian Xiangfan Power Generation Corporation Limited was put into operation, the tube wall temperature of the final superheater often exceeded the alarm temperature at high boiler load, and the highest value was higher than 620℃. Some countermeasures were adopted, such as to adjust the horizontal swing angle and the updown swing angle of the SOFA burner, to adjust the opening of the air damper. Then in boiler operation with full load, the tube wall temperature of the final superheater can be controlled lower than the allowable temperature of 600℃.

Reason analysis of caloric value major difference of asreceived coal and asfired coal

LI Changzhi

2010, 32(8): 37-38.

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The caloric value of asreceived coal and that of asfired coal of China Huadian Fulaerji General Power Plant in the first quarter 2009 were compared, and the reasons caused the difference of caloric values of asreceived coal and asfired coal were analyzed. It was found that the main factor influencing on the difference of caloric values is coal moisture. The relevant measures were proposed, and the difference of caloric values of asreceived coal and asfired coal had been controlled in rational range. 

Application of static frequency converter in pumped storage power station

SHU Jianhong;ZHENG Jianfeng

2010, 32(8): 39-41.

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As variable frequency staring power source for pump condition of generator/motor unit, the static frequency converter mainly used to drive the unit into motor condition with rated turning speed, so that the unit can be connected with power grid. The basic work principle, main devices and function of the static frequency converter were introduced, the problems occurred in application of the static frequency converter in pumped storage power station and the treatment methods were analyzed and summarized. 

Research on technical water supply mode in fourth cascade hydropower station

LI Lincang

2010, 32(8): 42-43.

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The rationality of the technical water supply of the hydropower station buildings directly related to the safe operation of the unit and the economical benefit of the hydropower station. The main problems existing in the technical water supply system of the Fourth Cascade Hydropower Station of Huadian Yunnan Yilihe Hydropower Plant were analyzed. A reformation scheme was put forward, in which the water supply pump will be replaced by the variable frequency and constant pressure pump. The scheme can increase the operation reliability of the hydropower station remarkably and provide the good foundation for operation of the main equipments in the hydropower station.

Reformation of distributed electric control system based on field bus

ZHUO Wei

2010, 32(8): 44-46.

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Aiming at the problems of equipments aging and backward technique of the auxiliary power monitoring system in Shajiao C Power Plant of Guangdong Yuedean Group Corporation Limited, the distributed electric control system based on field bus (FECS) was put forward. The FECS mode and the networking scheme of this power plant were analyzed in detail, providing reference for similar power plant in reformation of auxiliary power monitoring system. 

Reasons analysis of accident of oil leakage into generator and preventive measures

CHEN Zhiwei

2010, 32(8): 47-49.

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The working principle of the singlering oil sealing system for generator was introduced. Taking an accident of oil leakage into generator as example, the various reasons, which may cause the oil leakage into generator, were analyzed; a series of effective preventive measures was put forward, and better results were obtained.

Analysis and treatment on abnormal situations of turbine seal oil system

WU Qiang

2010, 32(8): 50-53.

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In the seal oil system of steam turbine No.2 in Hunan Huadian Changsha Power Generation Corporation Limited, the hydrogen purity was less than the standard, the vacuum of the seal oil vacuous tank was below the standard, and there were many bubbles in the oil of the seal oil vacuous tank. Aiming at the problems listed above, the abnormal situation occurred in the seal oil system of the unit No.2 was analyzed, and relevant treatment measures were adopted.

Combustion adjustment of 2020t/h boiler in Zouxian Power Plant responding to changed coal grade

LIU San

2010, 32(8): 54-57.

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The designed coal of the 2020t/h of Huadian International Zouxian Power Plant project phase III is local soft coal. For the near term, the fired coal quality was changed greatly due to the insufficient coal supply. In a certain period after the coal grade was changed, the unstable boiler combustion was often occurred or the furnace negative pressure was rocked in largescale amplitude, and the temperature of main steam and reheated steam can not reach the required value; even the boiler flame out accident was happened. This became a serious potential hazard for stable and economical operation of unit. The reasons of this fault were analyzed. The relevant solution was proposed, and better result had been obtained.

Analysis and application of reheater attemperating water control technology

CAO Dinghua;LIU Haiyang

2010, 32(8): 58-60.

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The factors influencing on the reheater attemperating water were analyzed, which include the thermal load characteristics of boiler, the soot blowing optimization, the combustion adjustment, the operation mode of unit, the equipment management and others. Aiming at the typical condition of boiler, the characteristics of attemperating water were discoursed, and the relevant operation technology for controlling reheater attemperating water was proposed. Then the problem of the reheater attemperating water, the quantity of which was too large at long time, was solved successfully, and a more reliable reference was provided for reheater attemperating water control in power generation enterprise.

Matters needing attention in TSI system overhaul of 335W unit and adjustment scheme

ZHANG Qingguo

2010, 32(8): 61-63.

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The problems occurred in 335MW turbine TSI system overhaul of Huadian International Zouxian Power Plant were analyzed. According to the practical situation, the matters needing attention and adjustment scheme, purpose of which is to enhance the TSI system stable operation performance, were put forward. According to this scheme, the adjustment values of TSI detectors were corrected, the requirement gap width of TSI system measurement probes were ensured, and the accuracy of the alarm value and the trip value set in TSI system was ensured too. Then the adjustment of TSI according to this scheme gave favorable effects.

Analysis on environmental pollution and water consumption rate prediction model of thermal power plant

SHEN Mingzhong;HAN Mailiang

2010, 32(8): 64-69.

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The classes of the main pollution in thermal power plant were introduced. Based on this, the investigation results of the water consumption and the pollutant discharge amount of thermal power plant were expounded. The current situation of water utilization in domestic thermal power plants and the potential in water saving were analyzed; and a water consumption rate prediction model for thermal power plants was built. The improvement measures and scheme for water saving were put forward to raise the water utilization efficiency and reduce the wastewater discharge.

Wastewater treatment technology for lime stonegypsum WFGD system

L Xinfeng

2010, 32(8): 70-72.

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Aiming at the features of commissioning and operation of the wastewater treatment system in wet FGD project of Guohua Ninghai Power Plant project phase II (2×1000MW), the sources, the quality and the treatment process flow of the wastewater were analyzed. The operation parameters of the wastewater treatment and the laws of rational operation for the wastewater treatment system were summarized. Some relevant rational proposals for wastewater treatment operation were put forward, which can be used as reference for the same professional in wastewater treatment of thermal power plant.

Analysis on development situation of wind power generation system

WANG Xiuli

2010, 32(8): 73-75.

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The development situations of wind power generation system, domestic and abroad, were introduced; the researching status on domestic wind power generation was described. Several wind power generation modes commonly used in practice were expounded. Combining with the trend of present wind power developing in large scale, some problems existing in the wind power development were put forward; and combining with the practice, the relevant suggestions were given. 

Analysis and evaluation of wind energy resource of wind power plant

HAO Qingfua;LIU Yanquana;WANG Kunb

2010, 32(8): 76-79.

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According to the information provided by the weather station of the area, in which a wind power plant locates, the essential factors of the wind energy were analyzed and neatened，and the revised data of the wind speed, the wind power density, the frequency of wind speed, the frequency of wind energy in the wind measuring tower were obtained. The analysis results show that the area is rich in wind energy resource, its number of hours of effective winds is larger, its wind direction is stable, the wind energy distribution is centralized, and the destructive wind speed is smaller, so the area is suitable to build the wind power plant.

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