Integrated Intelligent Energy

Study on new strategy of the furnace combustion control system based on the radiant energy signal

LI Fengling;WANG Xiuxia;ZHANG Jiangjun;LI Jing

2009, 31(8): 1-3.

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By using the existing research result of visual three dimensional furnace temperature field, the radiant energy signal in furnace, as a middle controlled variable, had been introduced and used to form a cascade control system. The genetic algorithm was adopted to optimize the fuzzy controller, and its control strategy was applied in the steam pressure control subsystem of the combustion control system. The simulation experiment was carried out, and the result verified the feasibility of the algorithm.

Analysis of fuel oil system fault in ultrasupercritical boiler

YIN Minquan;YIN Jun;GUO Jingchang;CHANG Bin;SUN Lei

2009, 31(8): 4-8.

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The oil feed pump and fuel oil system of the ultrasupercritical boiler in Huadian International Zouxian Power Plant project phase IV were put in operation in 2007. Since then some faults were occurred which includes the frequent oil leakage of oil gun, the higher returnedoil temperature of oil feed system, jam of oil gun and ignition rod and etc. The reasons of these faults were analyzed from system location, structure of equipment, design, installation, operation, maintenance and other aspects. Combining with the experience obtained from accomplished improvement and reformation, some preventive measures and proposals were put forward.

Reason analysis of high pressure cylinder encrust in subcritical unit turbine

LIU Yufeng;LIU Wei

2009, 31(8): 9-10.

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The problem of copper encrustation created in high pressure cylinder of No.1 subcritical unit turbine in Liaoning Huadian Tieling Power Generation Corporation Limited was researched. The reason of copper encrustation creation was analyzed, and relevant prevention measures were put forward. The practical operation shows that the starting up water quality was obviously improved due to adopting the measures.

Analysis of exhaust temperature monitor and protection function for gas turbine

MAO Huajun

2009, 31(8): 11-15.

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The basic function of the gas turbine exhaust temperature dispersity monitor system was introduced. Taking the DLN2.0+ combustion chamber as example, the importance of the exhaust temperature dispersity monitoring and protection function for the gas turbine was explained. The formation mechanism of bulging and cracking of combustor inner liner and his influence on gas turbine exhaust temperature dispersity was analyzed. Some relevant measures were proposed to prevent the components in heat passage from hurt due to combustion deterioration.

The constitution and function of natural gas booster station in gas turbine combination cycle power plant

XU Ming

2009, 31(8): 16-18.

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The boost station in gas turbine combination cycle power plant is important treatment system for improving the natural gas quality to meet the requirement of gas turbine input, and it is directly related to the safe and silent running of downstream unit and equipment. Take the natural gas booster station built in 9E class gas turbine combination cycle power plant for example, its function and system constitution were introduced and analyzed. It is expected that this could be used as a reference for domestic, similar project construction.

Reason analysis of beaker refusal of action and relevant countermeasure

YANG Shiyong

2009, 31(8): 19-21.

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The Aphase grounding fault of 110kV Qiahe No.1 line in Qiafuqihai Hydropower Station of Xinjiang Ili River Basin Development and Construction Administrative Bureau was occurred. After that, the line protection acted correctly, but Aphase breaker rejected to trip, the local backup protection (bus) rejected to act, and remote backup protection acted and caused accident scope expansion. The accident field operators considered the problems unilaterally, and this leaded trial power transmission to be failure and the accident scope to expand once again. The reason of the accident was analyzed. According to the concrete condition after protection action, and according to the protection and fault record message, a scientific decision was got, and the accident expansion was avoided.

Research of the speed adjustment system based on PLC and fuzzy control

SUN Jiang;QI Xiangdong

2009, 31(8): 22-25.

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Along with the development of science and technology, modern control systems become more complex, traditional control methods is no longer suitable for the requirement of production. According to the analysis of fuzzy controller, a PLC based control method combining the fuzzy control and traditional control was put forward, and a digital controller with adaptation function was designed. Theoretical analysis and simulation result indicate that the controller is simple and has wide application prospect.

Research on layout scheme of gas turbine combined cycle units

ZHANG Jun

2009, 31(8): 26-30.

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Several layout schemes of gas turbine combined cycle units were introduced. The type of uniaxial combined cycle unit was researched and compared with other types emphatically. Then the obtained conclusion is that for many paralleled sets of Fclass uniaxial combined cycle units, must implement the unitmode compact layout, the unitmode construction, the unitmode operation and overhaul, and must be convenient for extension construction.

Discussion about structure design of floating debris obstructing row

SU Zhenrong

2009, 31(8): 31-32.

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The floating debris obstructing row is placed on the water inlet of a hydropower station. It is floating on the water surface and rising or falling along with waterlevel fluctuation. It is used to obstruct the floating objects with size larger than certain specification. Two engineering practical examples of floating debris obstructing row (floating trash rack), which are obviously different in structure, were introduced. Based on the examples, a new envisage of floating debris obstructing row, which would adopt the floating box structure, were put forward.

Analysis on circulating water system startup under condition of empty pipes in thermal power plant

LIU Tao

2009, 31(8): 33-35.

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Beginning from the actual starting process of circulating water system under the condition of empty pipes in the conventional thermal power plant, kinds of factors which influence the safety of circulating water system startup under condition of empty pipes have been analyzed, and, combining the practice, the operation method and suggestions were provided as a reference for formulating startup plane of the same type system.

Analysis of governor valve jam fault in DEH system and countermeasures

ZHANG Yanjun

2009, 31(8): 36-40.

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The structure and operation principle of the digital electric hydraulic control system (DEH) for steam turbine were introduced. Aiming at the governor valve jam problem of DEH system in 200MW unit of Xinjiang Huadian Hongyanchi Power Generation Corporation Limited, some problems needing attention in overhaul of automatic main steam valve, high pressure and medium pressure governor valves were pointed out, and the measures to prevent jam fault were given.

Variable frequency technical reformation of condensate pump motor

ZHANG Haifeng;CHEN Hao;YU Kaihong

2009, 31(8): 41-42.

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The development of high voltage variable frequency technology directly pushed forward the energy saving and consumption reducing of thermal power plant. There are many kinds and manufacturers of the frequency converter, and there exist greater difference in their technical levels, and these cause some difficulty for high voltage frequency converter selection. The thought of type selection in variable frequency technical reformation of condensate pump in Guizhou Dafang Power Generation Corporation Limited was introduced. Some experiences obtained from debugging and operating of the variablefrequency system were summarized, and the energy saving effect of the variable frequency reformation was analyzed.

Application of deviation rectifying hydraulic system in iron remover

ZHOU Kai;RUI Zhiguang

2009, 31(8): 43-44.

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The deviation rectifying hydraulic system is one complete set of hydraulic servo system. The composition of the deviation rectifying hydraulic system was introduced. The movement procedure of the deviation rectifying hydraulic system was analyzed. And the design of this equipment was introduced briefly.

Problems in application of magnetic holding relay and improvement measures

ZHONG Guofang;CHEN Huiqiang

2009, 31(8): 45-47.

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The operating principle of magnetic holding relay was introduced. The problems occurred in application of magnetic holding relay in secondary circuit were analyzed. Some improvement measures were proposed, and the function of magnetic holding relay in control circuit and voltage switching circuit was perfected.

Application of soft start up control in oil pressure device of tubulous hydropower station

LI Yiping

2009, 31(8): 48-50.

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The oil pressure device of Xiaoxiang Hydropower Station was introduced. The problems existing in the initial control mode were analyzed. And the experiences obtained during the reformation plan implementation were summarized. Then a conclusion was obtained that the soft starter can be successfully used in oil pressure system reformation of hydropower station and can make obvious economic benefit. The success of this example provided a reference for control mode optimization of hydropower station auxiliary equipment.

Variable frequency reformation of condensate boost pump in DCS system

SHI Zheng

2009, 31(8): 51-53.

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The condensate boost pump had been reformed by using of variable frequency speed control technology. After the reformation, the automatic control of the level of oxygen extractor was realized on DCS system. The difference between its reformed automatic adjustment circuit and original one was analyzed. Based on strict discussion of scheme design, the technical safety measures had been compiled, and the measures were implemented when the unit was overhaul or current repair, and the later debug was carried out, then the variable frequency automation had been put operation successfully. The results show that adopting the variable frequency controlled devices in the main auxiliaries of power plant with rational designed adjustment automatic circuit could ensure the reliability and safety of the unit operation to be not reduced, and this reformation has advantage of less input and quick results, and has active effects for energysaving and reducing the house service consumption rate.

Reason of water mixing into unit air side sealing oil and treatment

Lv Pengfei

2009, 31(8): 54-56.

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The double ring sealing oil system and its structure features were introduced. The reason of water mixing into air side sealing oil of No.1 unit in Anhui Huadian Suzhou Power Generation Corporation Limited was analyzed, and relevant treatment measures were adopted. Some concrete prevention measures in operation were given in this paper.

Inquire into static shunt selfexcitation system protection and current equalizing measurement

ZHENG Bing

2009, 31(8): 57-58.

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The over voltage protection, over current protection and their parameters selection for shunt selfexcitation system were introduced. The current equalizing measures for parallel thyristors bridge rectifier were researched to raise the service life of thyristors and to ensure the safety of the electrical equipment.

Reformation of secondary air flow measurement device for 300MW unit

LING Peng

2009, 31(8): 59-61.

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The second air flow of the power plant boiler is about 70% of boiler total air flow. Therefore, the secondary air flow must be measured accurately to obtain good adjustment quality of draft air and boiler automation. The original secondary air flow measurement device of No.8 unit of Guangzhou Hengyun Power Plant was unable to meet the measurement and control requirement, and it had been replaced by FLII type air flow measurement device with soot selfcleaning and antiblockage function at the unit overhaul. Then accurate measurement of secondary air flow was realized, and draft air and boiler automation were well put into operation, and the maintenance became easy.

Frequency measurement method of power system based on wide area measurement system

WU Hongxia;ZHANG Jianhui

2009, 31(8): 62-64.

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The frequency measurement is of decisive significance in electric power system stability control. The limitations of the traditional frequency measurement method were analyzed. And based on the wide area measurement system, a new system frequency measurement method was proposed, in which the units rotate speed of the system was realtime measured, and then the frequency of system inertia center was calculated out.

Analysis of dynamic and static increasing capacity for some 110kV line

WANG Xueping;WANG Bo;DIAO Zhiwen;MAO Jigui;CAO Wenqi

2009, 31(8): 65-68.

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The dynamic and static increasing capacity of 110kV lines Qing san A and Qing san B was calculated and analyzed from the two angles of theory and practice. The result demonstrated that the lines are able to increase their capacity dynamically and statically. This provided new thought for scientific utility of line resource, and provided reference for theoretical calculation and practical analysis of dynamic and static increasing capacity of power transmission line.

Reformation of circulating fluidized bed boiler for stable operation

CAO Zhiyu;LI Yamei

2009, 31(8): 69-71.

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There were some problems in the operation of YG-75／3.82-M1 circulating fluidized bed boiler in Thermal Power Plant of Heihua Group which included shorter usage period of center cylinder, slag leakage of large air hood, serious wear on boiled upsection of water wall, and etc. Aiming at these problems, the concrete reformation measures were proposed. After the application of the reformation technology in production practice, the stable operation level of the boiler was raised, and favorable economical benefit was obtained.

Application of reverse osmosis water treatment technology in make up water treatment system

LI Changzhi

2009, 31(8): 72-73.

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The reverse osmosis water treatment technology is the most advanced, energysaving and environment protecting separation technology today. The principle is that under the pressure higher than the solution infiltrating pressure, the semipermeable membrane will allow the water to pass and prevent other materials to pass, and by using this selection feature of semipermeable membrane, the solute and solvent can be separated. Utilizing the filtering features of semipermeable membrane, the dissolved salt, colloid, organic matter, germ and some other impurity can be efficiently removed from water. This technology has advantages of lower energy consumption, pollution free, advantageous technology, simple for operation and maintenance and so on. The economical efficiency of the reverse osmosis water treatment technology applied in boiler make up water treatment system of Huadian Fularji General Power Plant of China Huadian Corporation and that of the traditional ion exchange desalination water treatment system were compared, the principle and application advantage of the reverse osmosis water treatment technology were expounded.

Design of anticorrosion system for flue gas cooling tower in power plant

JIANG Dagang

2009, 31(8): 74-77.

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The flue gas cooling tower technology was adopted in 2×350MW heat supply unit of Huadian Tianjin Junliangcheng Power Generation Corporation Limited project phase V. The corrosion mechanism of flue gas cooling tower was analyzed in detail. It is pointed out that adoption of anticorrosive coating is practical, domestic anticorrosion method. The principle for choice of anticorrosion system was introduced, and the problems needing attention in anticorrosion construction were put forward, so the anticorrosion quality of the cooling tower was raised fundamentally.

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