Integrated Intelligent Energy

Analysis and countermeasures for the pipe cracking faults of “4 pipes” of 1004t/h boiler in coalfired power plant

HU Liangying

2009, 31(5): 1-6.

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According to the specific type and statistics distribution characters of the pipe cracking faults of “4 pipes” of 1004t/h boiler in Jiangyou Power Plant occurred before the year 1998, combining the destruction forms of team scour, dust erosion, stress fracture, high temperature chemical corrosion and construction elements failures ahead of their lives, the analysis and summary for the factors of coal management, operation management, maintaining, overhauling, and external conditions, etc. which influent on the pipe cracking faults of boiler’s “4 pipes” were carried out, and the main causes were found out. Some directional and practical comprehensive countermeasures were proposed, the obvious results have been obtained. These are able to be the reference for treatments of the same type power units.

Analysis and treatment on the rub of turbine velocity measuring probe

JIA Huixin

2009, 31(5): 7-8.

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The paper introduces the unusual phenomenon and the disassembly check details of the turbine velocity measuring probe in Yunfu Power Plant of Guangdong Yudean Group Corporation Limited No.1 unit, and analyzes the rubbing reason. The structure improvements and prevention measurements are proposed, which may provide with reference for the same kind of units.

Realization of blocking function for breaker manually trip in AAT

FAN Shouzhong

2009, 31(5): 9-10.

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The realization of blocking function for breaker manually trip in microcomputer AAT was introduced. The AAT were classified according to the blocking methods for its beaker manually trip. The protection devices were classified according to the device whether has STJ and KKJ. And the coordination method of AAT with various protection devices was analyzed.

Reason analysis of drain pipe vibration of high pressure heater

LAI Hanxian

2009, 31(5): 11-12.

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There are many reasons which can cause equipment vibration. According to the reason analysis of drain pipe vibration of high pressure heater No.5, the possible reasons were checked and processed one by one, and the main reason causing pipe vibration was found finally. The effective measures were adopted, and the vibration of drain pipe of high pressure heater was weakened obviously.

Problems exist in air hoods of domestic CFB boiler and countermeasures

YAO Yanqiang

2009, 31(5): 13-15.

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Several kinds of current air hood used in domestic CFB boilers were introduced, the features of these air hoods were analyzed, and some problems exist in their application were pointed out. Combing with actual situation, corresponding countermeasures were given.

Design optimization of emergency power supply for flue gas desulphurization in 330MW unit

WANG Xiaodong;MA Junbiao;ZENG Guanghua;MA Jianping;HU Xiankuang

2009, 31(5): 16-19.

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The FGD system was not built in some operated power plant. Therefore, the connection between emergency load of FGD and power supply had not be considered in the design of those power plant, and this leads many difficulties for design of FGD emergency power supply in FGD reformation of those power plant. The design optimization process of FGD emergency power supply for 2×330MW units in Hubei Xisaishan Power Generation Corporation Limited was analyzed. The optimization provides a thought for emergency power supply design of FGD reformation in operated power plant, and this solution can be used as reference for similar project.

The cavitation erosion of water turbine guide vanes and its treatment method

LIN Chengfa

2009, 31(5): 20-21.

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The hydrogenerator unit No.2 of Qinshan Hydropower Station has commissioned for 1 year, while the machine rotated slightly again after it had been shut off and the air brake had been reverted. This may lead to failure of thrust-bearing because of low speed. By inspecting, it was found that the guide vans’s perpendicular surface, i.e. waterproof surface, was cavitated badly, so the unit was hard to shut down. After analyzing this problem, the methods of resurfacing welding for the cavitated area and then burnishing were implemented. The operation has proved that: the disposal effect is preferable, and the unit’s safety and stability in operation are insured.

Analysis on the characteristics of Wshaped flame boiler for super critical 600MW unit

MA Wangpeng

2009, 31(5): 22-23.

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In the Project Phase I of Yunnan Huadian Zhenxiong Power Generation Corporation Limited, Wshaped flame boiler for supercritical 600MW unit was adopted, it was supported by "MBEL" technique. This kind of boiler hasn’t been put into operation in Yunnan Huadian Zhenxiong Power Generation Corporation Limited at the present time, combining with its technical parameters, the characteristics of this type of boiler and the problems needing attention in usage were analyzed and discussed in this paper.

Research on illconditioned load flow algorithm of modern electric power system

LI Yuan

2009, 31(5): 24-27.

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Based on the research meaning, cause and characteristics of the illconditioned load flow, the various algorithms for the illconditioned load flow of power system were discoursed. Aiming at the characteristics of illconditioned load flow of modern power system which is difficult to converge, the load flow algorithm for large power system was described in detail, and various algorithms were compared and analyzed. The prospects of the research direction for the illconditioned load flow algorithm were discussed in this paper.

Application research of intelligent PID control based on the OPC

JING Chao;LIU Yanquan;WANG Lei;CUI Yongle

2009, 31(5): 28-30.

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Lab VIEW and Matlab is widely used in simulation, process management and control, but has not yet been directly applied in practical control system. By using the OPC communication technologies, we can establish the link between the intelligent control system and process database, to complete neural network online identification system model. And three parameters of PID control can be online adjusted by genetic algorithm. The simulation and research show that we can realize the effective online control for more complex system by using the method.

Research on operation safety and life evaluation for main steam pipe made of P92 steel

KE Wenshi;LIU Jinsheng;HONG Daowen;LIU Hongguo;LI Song;CAI Hui

2009, 31(5): 31-35.

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In the two 1000MW ultrasupercritical units of a certain power plant project phase I, the P92 steel ID 349mm×72mm main steam pipe was adopted. The operation safety and life of this thin walled pipe attracted a lot of attention. With the help of fullload spectrogram of actual pipe damage obtained from the constructed condition monitoring and life safety management system, aiming at the laws of two material creep damage conventional longtime strength and lower boundary longtime strength, considering two wall thickness thin wall and thick wall, the operation safety and expected service life of P92 steel main steam pipe under the conditions of several combinations were analyzed and researched.

Application of MH110 doublescrew rod air compressor in gas turbine power plant

ZHANG Jun

2009, 31(5): 36-38.

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This paper introduced the work flow and equipment structure of the air compressor in Guangdong Huizhou Liquefied Natural Gas Power Corporation Limited, described their common faults and the handling methods, put forward and implemented the corresponding improvement measures to guarantee the secure operations of air compressor and the power generation unit.

Application of electric control system in power plant

LIU Jian;XU Hong

2009, 31(5): 39-43.

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The electric control system manufactured by Beijing Sifang Relay Protection Automation Corporation Limited is adopted in Shanxi Yuncheng Power Generation Corporation Limited of Datang International Power Generation Corporation Limited. The usage of the electric control system for protection, measurement and control was introduced. In this system, the communication with measurement and control equipment is all realized by LONWRORS or RS485 field bus, a great amount of control cables were saved, the construction cost was reduced, and the automation level was raised. Aiming at the characteristics of electric control system, the network structure, system scheme, system maintenance and others were summarized.

Optimization measure for coal pulverizing system with intermediate silo

XU Xiaogang;CHENG Hongxia

2009, 31(5): 44-46.

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Coal pulverizing system is an essential part of coalfired power plant. The power consumption of this system is comparatively high. It even reaches to 20% of service power for pulverizing system with ball mill and intermediate silo. It is a historic problem to perplex power plant that how to decrease the unit consumption of coal pulverizing and the service power, and heighten the economic benefit of plant. This thesis gave the analysis for optimized way of pulverizing system with intermediate silo, and some concrete measures & suggestions base on the problems of this system in Jiaozuo Wanfang Power Corporation Limited. The unit consumption of the pulverizing system has decreased 12%～17% after the measures & suggestions were implemented in 2008.

Cause analysis and the treatment on the boiler membrane wall leakage

MI Hui

2009, 31(5): 47-49.

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This paper analyzes the membrane water wall leakage of the Yunfu Power Plant Corporation Limited of Guandong Yudean Groap corporation Limited No.4 boiler, it has been discovered that the stiffening bar unreasonable structure design was the primary reason to cause the problem occurring，by implementing the proposed basic method, the problem has been successfully solved，and the operation stability of the boiler membrane water wall has get a very great improvement.

Causes analysis and reformation on high water content ratio of clinker in power plant

ZHANG Xiaowei

2009, 31(5): 50-51.

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The problem of ash and slag with high water content has existed since the No.1 boiler of The Mine Mouth Power Plant of Pingdingshan Coal Group Corporation Limited was put in operation, it was occurred quite often that the chainbucket conveyor and bucket elevator were stuck and plugged by ash. After analysis, the following reformation methods were proposed: parching the ash and slag to remove the water, then transmitting them to the chainbucket conveyor and bucket elevator through a conveyor, and finally entering into the storage silo. The application of these reformation methods has decreased intensity of work and gotten obviously economical effects.

Energy saving reform for EP electric control system

ZHANG Haifeng;XU Hongnian

2009, 31(5): 52-53.

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The technical reform is the way one must follow or take for thermal power plant energy saving at large amplitude. This paper introduced the technical reform for EP electric control system in Guizhou Dafang Power Generation Corporation Limited, and analyzed bravely the reasons of high energy consumption under the normal operation method. The operation current has been decreased observably after adopting DKZ-2 EP electric control device, the energy saving effect is obvious.

The spiral case disk shaped drain valve joystick fracture repair of Three Gorges Hydropower Station

XIAO Han;ZHOU Yaolong

2009, 31(5): 54-56.

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In commission of Unit No.22 of Three Gorges Right Bank Hydropower Station, the volute shaped disk drain valve joystick has broken. The joystick has to be repaired for it is impossible to be replaced. According to careful study and comparison, the tungsten argon arc welding technology and mechanical workout were adopted finally for the repair. The concrete processing scheme and the result were analyzed and summarized, and relevant proposal for the handling of future same problem was given. After the repair, the joystick can meet the technical requirements of highprecision for slender piece.

Measures for retrieve ball rate increasing of condenser cleaning device with sponge rubber ball

GUO Libin

2009, 31(5): 57-58.

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Turbine condenser is important equipment in thermal power plant, cleanliness condition of condenser tube wall of water side is of very significance with regard to optimum vacuum of condenser and the economical efficiency of the unit. The condenser cleaning device with sponge rubber ball for 135MW unit were introduced, the reasons of low retrieve ball rate were analyzed, the measurements were proposed, and after the reformation, retrieve ball rates have gotten increasing obviously.

The application of new electric operation mode in gas turbine plant

YU Lifan

2009, 31(5): 59-61.

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This paper introduced the The Electricity Industry Safety Work Rules and the conventional electric operation requirements and the provision of “six demands and eight steps”. Because the conventional operation mode can’t be satisfied the operation requirements of new power plants and gas turbine plants, a new electric operation mode suiting for the gas turbine plants was proposed and its safety was analyzed, the mode may be as a reference for the electric operation of other gas turbine plants.

Analysis and commissioning for coordination control system

SHI Gang;SUN Junfeng

2009, 31(5): 62-67.

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The Siemens TELEPERM-XP distributed control system was adopted in Yangzhou Second Power Generation Corporation Limited Phase I Project. The coordination control mode based on the principle of boiler follow (BF) was used in the unit control, which has faster response speed, lower load change speed and larger steam pressure fluctuation at high load condition. In the second time optimizing commissioning organized by Yangzhou Second Power Generation Corporation Limited, more attention has been paid to maintain the stabilization of main stream pressure and to insure the parameters of every automatic control loop were easy to control during load change. The safety, stabilization and economy of unit operation was emphasized, and analysis of characteristics of controlled objects was emphasized too. After the optimizing commissioning, accuracy of automatic control has raised a lot.

Investigation of plant SIS construction in stages and informationization

HUANG Qiang

2009, 31(5): 67-70.

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The exploring works of plant SIS construction in stages in Hunan Huadian Changsha Power Generation Corporation Limited were introduced. It is pointed out that for a successful SIS construction, the first stage is to construct the fundamental function of the SIS, and the advanced function of SIS should be developed in following-up stages. The informatization direction of power plant was investigated.

Analysis on oilsaving in power boiler

LIU Yujing;YIN Minquan

2009, 31(5): 71-75.

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Based on the fuel oil status of different kinds of units, which were belonged to the State Power Corporation Limited, in different conditions from 1999—2000, the oil consumptions of different kinds of units were analyzed, the application conditions of plasma oilless ignition technique and tinyoil ignition technique were introduced emphatically, the performance characteristics of them and the matters needing attention in the application were discussed.

Application of converter in energy saving reformation of power plant service water system

DOU Wang;ZOU Enlin

2009, 31(5): 76-77.

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The energy saving principle of pump controlled by variable frequency speed control technology was introduced, the application of converter in power plant service water supply system with constant pressure was presented. Aiming at the problems occurred in service water pump system of Huaibei Guoan Electric Power Corporation Limited, some concrete measures for variable frequency energy saving reformation were put forward, and obvious energy saving effect was obtained after the reformation.

Equipment hierarchical management method in power generation enterprise

ZHANG Jingqi

2009, 31(5): 78-80.

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Equipments are the material base of production activities for power generation enterprises, and the improvement of equipment management will play a vital role in increase of enterprise competitive strength, reducing the cost of maintenance and safety, continuous production. Therefore, strengthening scientific equipment management is an important guarantee for equipment normal operation and good economic benefit. Generally, the main contents of equipment management includes fore period management, later period management and equipment using, maintenance, overhaul and updating. The hierarchical equipment management methods were described in detail which were proposed based on the three management mode of equipment reliability management and equipment maintenance management.

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