Integrated Intelligent Energy

Analysis on pollutants discharge of coalfired plant and the comprehensive treatments

JIANG Zisheng;HUANG Xiang

2009, 31(1): 1-6.

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Based on the domestic statistical data, the analysis and calculations have been made for the pollutants discharge of coalfired plant. Related treatment measures and comprehensive treatments for different pollutants, which includes dust, sulfide, nitrogen oxide, mercury, ash, dregs, plaster, carbon dioxide and waste water, have been proposed. The influences on the electricity prices by using different treatment measures have been discussed. Some approaches to decrease the pollutants discharge have been put forward.

Reason analysis of stator core loose and tooth fracture in hydroelectric generator and prevention

CHENG Deming

2009, 31(1): 7-10.

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The reasons of stator core loose and tooth fracture of core lamination were analyzed,in which not only the static state was considered, but also, the variation of the used materials by influecing of mechanical force, electromagnetic force and heat expansion were considered too, and detailed calculation was accomplished. Then the rational explanations of present problems were obtained.

Analysis of rusting of steel penstock in the flow passage of hydroelectric generator unit

HUANG Chunzhong

2009, 31(1): 11-13.

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The metal material rusting of steel penstock, spiral casing, stay vane and movable guide vane in flow passage of unit No.2 in Wujiangdu Power Plant was described. The reason of rusting was analyzed briefly from aspects of anticorrosion treatment, operation of reservoir, water quality and operation of generator unit, and the treatment methods were proposed.

The force analysis of upper cover in Etan Hydropower Station after reformation of capacity expansion

FANG Zhumei

2009, 31(1): 14-17.

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The old unit of Etan Hydropower Station was reformed for capacity expansion using the original power house. The normal level in upper reaches of reformed unit was raised, and the pressure upon the flow components was increased. The force analysis of upper cover of reformed unit was accomplished, and it is determined by which that whether require to replace a new upper cover for the reformed unit.

Field manufacturing of largesize subrigid stainless steel bellows expansion joint in hydropower station

ZHANG Ruijie

2009, 31(1): 17-20.

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Field manufacturing of DN6200mm subrigid stainless steel bellows expansion joint in a hydropower station in Xinjiang was introduced, which includes the coiling, assembling and welding of thick walled parts. The main point for quality control and inspection standard were worked out.

Improvement measure of pump water control device of collecting well in hydropower station

ZHOU Yuling;ZHENG Xiaoqin

2009, 31(1): 21-22.

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Smooth drainage of collecting well in hydropower station is important to ensure the station normal operation. The problems existed in collecting well of a hydropower station were analyzed, the technical reformation was accomplished by combining the conventional control system of the power station with computer control system, and excellent economic benefit was obtained.

Analysis of energy saving effect in boiler island of ultra supercritical unit

YIN Jun;REN Shangkun;YUAN He

2009, 31(1): 23-27.

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After the 1000MW unit of Zouxian Power Plant of Huadian Power International Corporation Limited was put in operation, there were problems of incomplete combustion existed in normal operation of the burning system, which includes the black coking piece like carbon and particles of coal found in the slag. At the boiler overhaul, it is fund that there were dust deposit in the burner and the cannel of primary air was clogged by slag block etc. through follow surveillance, it is found that the slag increased, slag block fallen became big in the boiler No.7 after overhaul at may 2008, and the combustible dust in slag was increased abnormally. From angles of boiler design, installation, overhaul, operation and maintenance, the influence of heat leakage was analyzed, and some aimed measures were put forward. It is expected that the measures would be useful for energysaving and emission reducing.

Design of twophase stepping motor driving circuit

YU Bingxiong;CHEN Zhiling;LI Haoliang

2009, 31(1): 28-30.

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The design scheme of common unipolar and bipolar driving circuits for BYG general series of two phase stepping motors were introduced, which illustrates control methods for two phases stepping motor theoretically and increases the flexibility of driving circuit design for stepping motor. The AT89S52 online programmable singlechip computer was used as controller in both unipolar and bipolar driving circuit designs for two phase stepping motor, and driving circuits were composed of TIP142 darlington power transistors. The structure of designed circuit is simple, and the design thread is clear. The feature, difference and selection method in use of unipolar and bipolar driving circuits design schemes were analyzed and compared in this paper.

The method of shortening the time for direct current resistance testing of transformer lowvoltage side

CHENG Zhenwei;CHAI Fangguang

2009, 31(1): 31-33.

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The time for direct current resistance testing of transformer lowvoltage side was too long, the reason of which was analyzed, and the solving method was put forward. It is expected that the method can be used as reference for transformer field testing of other hydropower stations.

Analysis of blast fault at the tail of high pressure cylinder in 600MW turbine and countermeasures

JING Changcai

2009, 31(1): 34-36.

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The blast fault at tail of high pressure cylinder of turbine were analyzed comprehensively, which includes the mechanism of blast fault of turbine high pressure cylinder, the startup mode leading blast fault; the factors influencing on blast, prevention measures and others. The fault reasons were dissected combining with the examples of blast fault of high pressure cylinder of 600MW turbine. The result will can play a certain technical instruction roles on turbine safety, stable operation.

Economic analysis on heat supply at low vacuum operation of condenser

WANG Xiaohong;SUN Chao

2009, 31(1): 37-39.

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Using the circulating water of turbine for heating at winter is an effective energysaving technology. In order to increase the temperature of circulating water, the turbine will operate at lower vacuum condition in this process. The reformation of heat supply system using circulating water in Fulaerji Thermal Power Plant was described in detail. The calculation shows that excellent social and economic benefits were obtained by the reformation.

Attempt to use turbinedriven pump as main feed pump for boiler

QIAN Jiang

2009, 31(1): 40-42.

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Usyally the electrical feed pump was used for boiler,and the turbinedriven pump was used as standby pump. The surplus steam of the boiler or industrial extraction steam is used to feed a small turbine and to drive the boiler feed pump, and the exhaust steam of the small turbine is sended into deaerator and used as heater steam. This operation mode can reduces operation cost and raises economic benefit. The attempt to use the turbinedriven pump as boiler main feed pump was realized in the new 130t/h gas fired boiler of Power Plant in Shuicheng Iron & Steel Group, and the method can be offered colleagues as reference.

Application of computer supervisory control system in power plant

YU Lifan;LING Guanghong

2009, 31(1): 43-46.

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The features of computer supervisory control system in Hangzhou Huadian Banshan Power Generation Corporation Limited were introduced. Some problems existing in practical application of the system were discussed. The relevant treatment countermeasures were adopted, so the hidden accident potential caused by operation against rules was avoided.

Analysis of motor bearing faults and handling

SU Xiangjun

2009, 31(1): 47-49.

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The motors are important power equipments of power plant, the reliability of which will influences on unit safety operation directly. Some examples of motor bearing faults in Wangting Power Plant and their handling processes were introduced. Through faults analysis, the problems in using, maintenance and overhauling of motor bearing which need to pay attention to were summarized and prepared reference for similar units.

Reformation of soot blower control system

WU Xiaozhou

2009, 31(1): 50-52.

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The control method of soot blowing system by using Symphony/Melody distributed control system was introduced. The control scheme, the control principle of electrical circuit and realization of control logic were analyzed. Some defects founded in system adjustment were discussed, and the solving methods were given.

Application of voltage extending panel in substation

SHU Yishi;YU Peijie;MA Yong

2009, 31(1): 53-54.

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The design features of PT secondary voltage circuit of early substation were described, the defects in which was analyzed. These defects caused some difficulties and potential safety hazard in daily maintenance of voltage circuit and technical reformations in substation. The advantages of using voltage extending panel were expounded emphatically by means of comparison. It is suggested that the men can consider using extending panel who would reform an old substation or construct a new substation.

Discussion about application of communication contingency plan in the ice calamity

CHEN Fang

2009, 31(1): 55-56.

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The application of communication contingency plan of Wujiangdu Hydropower Plant in ice calamity at the beginning of 2008 was introduced. The successful experiences were summarized, the deficiencies were found, and the preplan was perfected. Then the contingency measures for similar or more serious calamities were provided, and the ability of calamity withstanding and ability of communication guarantee were raised.

Economic analysis for head telescopic device in coal handling system

WANG Libo

2009, 31(1): 57-60.

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According to the structure, function and features of the telescopic device, combining with the situation of coal handling system of power plant, taking Qinhuangdao Coal Wharf and Luohe Thermo Power Plant as examples, the economic efficiency and applicability of telescopic device applied in coal handling system of thermal power plant were analyzed. An argument obtained by the analysis is that the telescopic device is more suitable for application in largesize rubber belt conveyer which has two or more working positions.

Characteristics of IGCC and technology of CO2 capture

SU Jianfeng;LI Heping;YUN Xiaoyin;QIU Hemei

2009, 31(1): 60-65.

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The characteristics of Texaco gasifier and shell gasifier in IGCC gasification subsystem are introduced briefly. The influence of air separation subsystem to the IGCC Integration characteristics was discussed, The features of gas turbine which is suited to burn low heat value syngas was also described. Four ways of carbon dioxide capture are analyzed. The key restrictive factors for IGCC faster development were pointed out. It was pointed out finally that the IGCC will have stronger and stronger competitiveness through continuous researching and development.

The problems in operation and maintenance of wet desulphurization system

TONG Gang;DENG Yongzhong

2009, 31(1): 66-69.

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Some practical problems occurred in wet limestonegypsum method FGD system of a certain power generation corporation were researched. The influences of dust concentration, absorption tower overflow and process design on operation and maintenance of desulphurization system were discussed emphatically. Aiming at the problems, several rectification measures were proposed.

Analysis of solar thermal electric power generation system

GAO Song;HOU Hongjuan

2009, 31(1): 70-74.

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It has important significance to grasp the generating mode and performance of solar thermal electric power generation system for development of the system. There are three generation modes of solar thermal electric power generation system: trough system, tower system and dish system, and their classification, working principle, main performance parameters, key techniques and development trends were introduced respectively. At the present time, the trough system and tower system have been commercialized in large scale, and the dish system is in demonstration stage yet. The trough system will can compete with conventional thermal power generation in generation cost. The dish system has highest net generation efficiency in the three types. The tower system has higher construction cost for unit capacity and which is difficult to be reduced.

Competitive electricity pricing and corresponding strategy

TANG Huidi

2009, 31(1): 75-79.

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Along with the change of management mode of electric power industry, electricity pricing is changing from governmentfixed pricing to conference pricing and competitive market pricing. The electricity competitive pricing mechanizm was discussed emphatically, its origin and development history were investigated, the main forms and features of compretitive electricity pricing were researched. The strategy for power generation company to deal with the competition was descussed initially.

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