Integrated Intelligent Energy

The causes analysis on overtemperature of main steam of supercritical oncethrough boiler at initial stage of startup

MA Shidong

2009, 31(4): 1-3.

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At the startup process during commissioning period of No.1 600MW supercritical units in Anhui Huadian Suzhou Power Generation Corporation Limited, the problem of little overtemperature of the main steam occurred many times, especially in the first time of parallel in power grid. The main reasons were the small burning heat load, too much air flow and fuel, larger feedwater flow, unreasonable designs of attemperating water. In these regard, the series of measures were adopted, such as lowering the feedwater quantity during ignition, reducing fuel input, improving combustion, increasing combustion heat load, controlling the negative pressure of furnace at -100Pa, the total air flow of 0.5 ~ 0.6 million m3/h, and raising feedwater temperature above 100℃,etc. the problem of overtemperature of main steam during initial stage of startup process has been solved, and all the parameters have reached designed demands.

Analysis and treatment on the blast of HG1025-PM boiler reheater pipes

MA Fuwei;WANG Qiang;MA Dongsen

2009, 31(4): 4-8.

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No.1～No.4 lean coalfired boilers in some power plant were early products manufactured using introduced technique from CE.The first unit was put into operation in 1991, the faults of boiler reheater pipes cracking were occurred many times because of overtemperature, wear and crack. Combining with these 4 boilers′ treatment experiences, the comprehensive analyses have been done for the common pipe cracking faults of boiler reheater. An example was presented in this paper as a reference for the same type of boilers.

Slag discharge faults and precontrol measures of CFB boiler

ZHANG Li;LI Xinmin

2009, 31(4): 8-10.

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Salaqi Power Plant of Shenhua Shendong Power Corporation Limited has the first 300MW CFB (Circulating Fluidized Bed) boiler made in our country; this paper introduced the main slag discharge faults in the operation and analyzed their reasons. The failures recovery and equipments reform were explained briefly. Combination with the hidden troubles in slag discharge system of CFB boiler, a set of precontrol measures was proposed.

The measures for prevention extinguishment of boiler under cumulative heat releasing condition

LI Qiuhe

2009, 31(4): 11-12.

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When the load was down, the energy corresponding to output power of unit is equal to the sum of the heat created by combustion in furnace and the released cumulative heat. The output power at this condition may still be greater than the minimum load for steady combustion of certain coal grade, but its one part is produced by the boiler cumulative heat releasing, so the power produced by the combustion heat may be lees than the minimum load for steady combustion of the coal grade, and this will lead to extinguishment of boiler. According to analysis of concrete reason, the corresponding countermeasures were given.

Failure analysis on the pipe of convection surperheater in 440t/h boiler

WEN Mingming;

2009, 31(4): 13-15.

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The convection surperheater′s structure and 440t/h boiler system were introduced, metering and analyses were conducted for the sample of failure pipe. It was considered that the superheater blast was caused by the blockages of oxide skins, which were taken into pipes during unit startup and shutdown, and metal residues, which were left when maintenance, the blockage lead to overheating and then blasting. At last, some concrete suggestions for prevention pipe blast were proposed.

Analysis on the flow resistance characteristics of direct air cooled condenser at the air side

ZHANG Wei;LIU Haifeng;SHI Lei

2009, 31(4): 16-19.

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In the direct air cooling system, the key technology of air supply system is the optimal selection and design of axial fan. It is of great importance on the optimal design and economical operation of air cooling system. The static pressure of the axial fan depends on the flow resistance of the air cooled condenser (ACC).The causes of pressure losses when air passing through each part of A-shape air cooled condenser were analyzed. The resistance coefficient at different part of the bundles was determined. It offers good help for the optimal design of direct air cooling system.

The practice of slidingparameter shutdown in S109FA combined cycle generator unit

QIU Han;PAN Yan;YU Lifan

2009, 31(4): 20-22.

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The purpose of slidingparameter shutdown of S109FA combined cycle unit was introduced. The principle of Mark VI temperature match was expounded, the process of slidingparameter shutdown using temperature match method and its advantages and drawback were analyzed, and some matters needing attention in the process were pointed out too.

Causes analysis and improvement measures for excessive error of voltage drop in secondary circuit of voltage transformer

HUANG Xudong

2009, 31(4): 23-27.

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The influence of voltage drop in voltage transformer secondary circuit to the electric energy metering devices was described，the reasons for the voltage drop in voltage transformer′s secondary circuit were analyzed, and the measures to reduce the voltage drop in voltage transformer secondary circuit were proposed．

Application of the state monitoring and diagnosis system in the pumped storage power station

SHU Jianhong;ZHENG Jianfeng

2009, 31(4): 28-31.

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The software and hardware structures and the system functions of DIA TECH online condition monitoring and diagnosis system manufactured by VA TECH Company of Austria were described in detail, the scenarios occurred in its application were analyzed and summed up.

Application of 20kV voltage level in mediumvoltage power distribution network

ZHAO Guoxiang

2009, 31(4): 32-34.

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The 10kV voltage level was adopted basically for power supply in medium voltage power distribution network of some area. Along with the increasing of electric load density and the expanding of service area, the original power distribution network is not satisfy the needs for power supply. Development of 20kV voltage level power distribution network should bring notable benefit in reducing transmission losses and increasing transmission capacity. Based on theoretical analysis, combining with the pilot project of 20kV voltage level power distribution network in the city, the advantages and development prospect of 20kV power distribution network were demonstrated.

Application online monitor system for high voltage

GU Yadi;SUN Dingning;LIANG Lipeng;WANG Yinxia

2009, 31(4): 35-37.

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The operation principle and system constitution of online monitoring system for high voltage switch were described, the advantages and installation and application of the system were introduced, and some problems existed yet in the system were pointed out. The excellent economical benefits were obtained due to application of the system in thermal power plant.

Analysis of grounding mode by resistor for neutral point of 10kV power distribution network

XU Yao

2009, 31(4): 37-38.

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The classification of grounding mode for 10kV power distribution network was introduced. The advantages of neutral point grounding by resistor were put forward. The advantages and disadvantages of higher, medium and lower resistance of resistor used in neutral point grounding were compared. It was pointed out finally that the neutralpoint grounding of 10kV power distribution network by resistor is helpful for elimination faults of power network rapidly and effectively.

Reason of higher heat consumption rate of 150MW steam turbine and countermeasures

WEI Shengluan;ZHANG Dong;CHEN Tao

2009, 31(4): 39-43.

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The heat consumption rate is the important fact for the economical efficiency of power plant operation, it also is one of main indexes for reflecting the turbine performance. Based on the operation situation of 150MW singlecylinder, single shaft turboset in Sichuan Huadian Panzhihua Sanwei Power Generation Corporation Limited at last three years, the reason of higher heat consumption was analyzed, and a series of technical measures for reducing heat consumption of the set adopted in present stage was introduced which is helpful to raise the economical efficiency of the turboset operation.

Optimal adjustment of supports & hangers of hot reheater steam pipe

WEN Zhihua;DONG Lei;FU Jinliang

2009, 31(4): 44-46.

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The reasons leading to abnormal operation of hot reheater steam pipes in No.1 supercritical unit of Ruijin Power Plant of China Huaneng Group during trial operation were analyzed, and the pipe stress was calculated. Based on above analysis, the optimal adjustment scheme of the supports and hangers of the pipe was put forward.After implementation of the scheme, the pipe stress is equalized, the supports and hangers work well, and the requirement of longterm safety operation condition is satisfied.

Analysis of the coal transportation system faults and its improvement measures

HU Liangying

2009, 31(4): 47-49.

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The reasons of coal transportation system common faults in Jiangyou Power Plant 2×330MW units were analyzed, the treatment experiences were summed up, and some technical measures and suggestions for protecting system safety and steady running were proposed. The coal transportation system reliability was raised after implementing those measures in practice.

The reason of onoff action lag of turbine lube oil pressure switch and treatment

LAO Quanhong

2009, 31(4): 50-52.

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In the process of low lubricant oil pressure interlock protection of unit No.1 in Yunfu Power Plant Corporation Limited of Guangdong Yudean Group Corporation Limited, the action of turbine tripping pressure switch was ahead of the actions of linked AC and DC oil pump pressure switch. The problem of linked pumps pressure switch action delay was analyzed, and relevant test was carried out. Aiming at the defects existed in sampling tube installation, some improvement measures were adopted, and the problem was resolved effectively.

Fault treatment and optimization of ash and slag removing system in 600MW subcritical unit

LIU Xiaochuan

2009, 31(4): 53-56.

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The operations of the ash and slag removing systems of the two 600MW subcritical units in Yimin Power Plant project phase Ⅱ were introduced, some frequently occurring faults of the main equipments were described, and the handling measures adopted were expounded. The ash and slag removing system optimization scheme were analyzed, which is proposed for energy saving and emission reducing. And the trying out of the scheme in Yimin Power Plant shows that the scheme is useful for digging energy saving potential, raising economic benefit and safety operation of units.

Analysis on difficult points of heterogeneous steels welding craft

HOU Shiyong;XIE Buxing

2009, 31(4): 57-60.

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In this article several common heterogeneous steel joints were introduced, the welding characteristics of heterogeneous steel joints used in power plants and the kinds of difficult points for their welding were analyzed, and the craft of welding for heterogeneous steels have been pointed out.

Fault treatment on failure to open of the steam control valve

ZENG Jianbin

2009, 31(4): 61-62.

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In startup procedure of one power plant unit, steam control valve was failure to open. By overall inspection, it was found that the secondary pulse oilpressure was lower than normal. The initial judgment for it may be oil leakage, after inspecting and treating the fault was eliminated. The treatment method may serve as reference for other power plants to search the same type fault.

Faults analysis and routing maintenance of DCS system in power plant

PAN Jianzuo

2009, 31(4): 63-66.

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Kinds of faults of DCS system presented in thermal power plants operation was analyzed. Precautionary measures were expounded elaborately for c&I personnel in routing maintenance. It was hoped to sum up some rewarding experiences for raising DCS application level, thereby increasing safety and economical efficiency of power generate units.

Analysis of a tripping accident in 220kV line

LIU Shicheng

2009, 31(4): 67-69.

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Based on the message of protection device action and figure of fault recording for a tripping accident in 220kV line, the fault reason was analyzed, the relevant improvement measures were proposed, so the problem of incorrect action of protection equipment was solved.

The retrofit of slag handling system in power plant

WANG Huabing;LIU Minggang

2009, 31(4): 70-71.

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Based on the long term experiences in design, manufacture and using of slag conveyors, the problems existing in the retrofit of slag conveyors were analyzed, and the operable treatment methods were presented as a reference to slag conveyor reconstruct.

The desulphurization and dedust system reformation of 410t/h boiler

ZHANG Fenglan

2009, 31(4): 72-74.

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The technology principle, system process flow and main equipments of 410t/h boiler flue gas desulphurization and dedust technical reformation project were presented in detail. Combining with the problems occurred in system commission process, the operation and commission of this technology were reviewed.

The problems and treatment methods of desulphurization system operation in the 300MW unit

GONG Wei;CHEN Jun;WANG Hongze;WANG Lei

2009, 31(4): 75-77.

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In this article the problems, which include larger pressure drop of gas-gas heater (GGH), difficulty for gypsum dewatering, unsteady efficiency of desulphurization, occurred in the 300MW unit desulphurization system operation of Harbin Thermoelectric Corporation Limited were analyzed, the solving plan and treatment methods were proposed to guarantee the desulphurization system operating normally.

Development and main problems of solar thermal power generation technology

SU Jianfeng;LI Heping;YUN Xiaoyin;ZHAO Yuanhua

2009, 31(4): 78-82.

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Integration principle and characteristics of solar thermal power generation system were analyzed. Principles of parabolic tough type, tower type and dish type solar power generation system were introduced. The development situation and main problems of the three solar thermal power generation technologies were also expounded.

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