Integrated Intelligent Energy

Problems existing in sealing oil system of 300MW generator and countermeasures

YUAN Man, MA Huiping

2013, 35(8): 1-3.

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Abstract:Taking the 300MW turbine generator set of Huadian Xiangyang Power Generation Company Limited as example, the potential safety hazard of abnormal operation of sealing oil system during the unit startup, shutdown and normal operation caused by operation, maintenance, oil quality, oil temperature and other reasons was analyzed. Relevant countermeasures were put forward, which are helpful to ensure safe, economical and stable operation of the power plant.

Upgrade and reformation of emergency trip system of 330MW unit turbine

LIU Bei

2013, 35(8): 4-5.

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Abstract:The defects in design of the turbine emergency trip system (ETS) of Hubei Xisaishan Power Generation Company Limited were introduced. The measures of hardware upgrade and reformation were adopted, and the configuration was optimized. The design defects were eliminated, and the safety and the reliability of the turbine emergency trip system were improved.

Reformation of steam seal of 300MW turbine and effect analysis

LI Yanping

2013, 35(8): 6-8.

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Abstract:Aiming at the problems of larger steam leakage and lower reliability of the steam seal of a 300MW domestic unit, according to analysis on the structure characteristics of current steam seal and the existed problems before the seal reformation, the turbine seal reformation scheme and the reformation measures were put forward. After the seal had been reformed, the steam leakage of the high and middle pressure cylinder, the steam leakage in the end of the turbine and the interstage steam leakage were reduced; the physical work capacity of the steam and the relative inner efficiency were increased. The thermal economic efficiency of the unit was improved.

Program designing for full automatic trash remover

LIU Xiaorong

2013, 35(8): 9-10.

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Abstract:According to the electrical configuration and the working process of the full automatic trash remover, the selection of the program scheme and the programming were introduced. The mutual connections of various program segments and the correct application of the program instructions under different situations were discribed. The safe operation of the facility was ensured.

Encoder/inertia trackless navigation of substation inspection robot

WANG Jiafang 1, JIA Xiaoxia 1, FANG Jing 2

2013, 35(8): 11-14.

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Abstract:The navigation mode of current inspection robot for substation was studied. An encoder/inertia trackless navigation system, in which the stm32 is used as core, was developed, and the software design and hardware design were all completed. The Kalman filter inertial guidance algorithm, the closedloop speed measurement and PID speed control algorithm were adopted. By using the navigation mode, the navigation precision of the system was improved, and the construction period and the construction cost of the substation were reduced, which make the inspection robot to have better application value and market prospect.

Study on application of soot blower in soot blowing, descaling and decoking in large thermal power plant

LU Bulin

2013, 35(8): 15-18.

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Abstract:The soot blower is an important device for ensuring stable operation of boiler, improving the thermal efficiency of the boiler, saving the energy and reducing the atmospheric pollutant emission. The performance and the applicable place of the soot blower were introduced. The formation mechanisms of the ash, the slag and the coke on the surface of the heat exchangers of different zones in the boiler and the structure features were analyzed. The boiler soot blowers were sorted, and their advantages and disadvantages were compared. The conclusion is that the frequency adjustable power sound wave soot blower has obvious functions to remove the ash, the slag and the coke.

Technical analysis and design of power grid authentication authorization and audit management system

LUO Linbo 1, WANG Fuyu 1, HE Chucheng 2

2013, 35(8): 19-20.

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Abstract:The power grid authentication authorization and audit management system can realize the functions of unified account, centralized authentication, centralized authorization and centralized audit in the power grid. The system architecture, the key technology, the data storage, the main functions and the construction significance of the system were introduced. The main design and technology roadmap were analyzed. The implementation of the system improves the safety of the power grid system information and the efficiency of the system operation and maintenance.

Analysis on thermal economic efficiency of power generation circulating system optimization of a 315MW unit

YI Zuyao

2013, 35(8): 21-24.

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Abstract:Taking N315-16.7/538/538 unit as example, the organic working medium cycle was added into thermal circulation system of thermal power unit, and a new power generation model was established. Based on the combination of the water steam circulation module and the organic working medium circulation module, the thermal economic efficiency calculations for different designed conditions were carried out. The result show that the optimal model can reduce the heat loss of the unit cold end and the waste heat pollution, and the unit thermal economic efficiency can be improved.

Problems of periphery driving higheffective concentrator occurred in commissioning and solutions

MA Aixia

2013, 35(8): 25-27.

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Abstract:In commissioning of the higheffective periphery driving concentrator of a phosphate rock company, some problems occurred, which include the rolling wheel slipping, the insufficient rake frame strength and others. The reasons of the problems were analyzed. The relevant treatment measures were adopted, and the problems of the higheffective concentrator occurred in commissioning were solved effectively.

Diagnosis and treatment of grounding fault of 6kV highvoltage cable

LI Xiaoli, ZHANG Jianguo, SU Hongyi, NIE Yangping, ZHAO Xianrong

2013, 35(8): 28-30.

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Abstract:The fault of highvoltage power cable of a power plant occurred in operation was introduced. The reasons of the fault were analyzed. The fault point was positioned quickly by advanced equipment, the fault was treated, and the fault loss was reduced.

Influence of overexcitation on RET316 type transformer differential protection

BU Fanwei, LIN Xiguo

2013, 35(8): 31-35.

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Abstract:The RET316 type transformer differential protection device manufactured by ABB was introduced. An incorrect tripping of the transformer differential protection occurred in the voltage rising process of a unit in Huadian International Zouxian Power Plant. Taking this accident as example, the reasons of incorrect tripping of the ABBmade RET316 scalar product braking type transformer differential protection in overexcitation were analyzed comprehensively. It was determined that the overexcitation is the main reason causing the transformer differential protection to trip incorrectly. The effective measures were adopted, and similar accident dos not occur again.

Analysis on measurement error of drum water level measuring device of boiler and improvement measures

FU Hao, ZHAO Dongdong

2013, 35(8): 36-38.

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Abstract:The working principle of several commonused water level measuring devices for boiler steam drum was introduced. The reasons of error of the electric contact water level gauge and the differential pressure drum water level transducer were analyzed, and concrete amendment measures were put forward. The safety and reliability of the unit were improved thoroughly.

Analysis on application of steam exhaust waste heat recovery technology of Guojiawan Power Plant

LIU Chunxiao, ZHANG Ligang, WANG Zhongli, XIE Yongsheng

2013, 35(8): 39-40.

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Abstract:According to the investigation and analysis on waste heat in exhaust steam of Guojiawan Power Plant of Shenhua Shendong Electric Power Company Limited, it is determined that there was exhaust steam above 5t/h in the power plant. The existed system was reformed, and two GSHJ-DN125-PN2.5 type waste heat recovery devices were installed additionally to recover the exhaust steam. The investment of the project was analyzed, and the social effect and the economic benefit of exhaust steam waste heat recovery were expounded.

Analysis on reasons of rotor singlepoint grounding fault and treatment measures

LI Feng, LIU Haixia

2013, 35(8): 41-42.

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Abstract:The generator rotor grounding protection of unit No.4 in a power plant is based on the principle of PingPang type switchover protection. The rotor singlepoint grounding fault of the unit was analyzed, and it was determined that the reason of the fault is to change the protection output mode blindly. It was pointed out finally that for the devices based on the principle of PingPang type switchover protection, it is necessary to avoid turn on the switches of the rotor voltage circuit in multiple devices simultaneously; else the mutual interference may occur between the devices and cause the incorrect trip of the protection.

Analysis on factors causing operation fault of turboset

HUANG Wenyao 1, XIAO Tiehong 2

2013, 35(8): 43-45.

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Abstract:In order to reduce the fault rate of turboset of power plants, the main operation factors causing unit faults were analyzed and summarized. Aiming at the problems existing in current operation mode, effective measures were adopted, which are helpful to improve the unit operation level, to reduce unit fault and to ensure the unit to operate safely and higheffectively.

Analysis on upgrade and reformation of safety and stabilization device of a hydropower plant

XU Zhi

2013, 35(8): 46-48.

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Abstract:Taking the 500kV system of a power plant as example, the configuration and the functions of the RCS-992A distributed safety and stabilization control system were introduced. The upgrade reformation and debugging of the equipment were analyzed. After the equipment had been put into operation, the economic benefit of the power plant and the safety and stability of the power grid were improved.

Analysis on reasons of sealing oil leakage into generator and preventive measures

ZENG Junquan

2013, 35(8): 49-51.

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Abstract:In a minor overhaul of the 2×600MW supercritical unit of Guangdong Zhuhai Jinwan Power Generation Company Limited, some oil stains had been found on the surfaces of the stator and the rotor of the generator, and it was determined that there is little sealing oil leaking into generator. The system operation and the reasons of sealing oil leakage into generator were analyzed. Some countermeasures were adopted in installation and operation of the generator, and the problem of oil leakage into generator was eradicated completely.

Analysis on application of precise spot inspection in diagnosis of rotor cage bar fracture of highvoltage motor

HOU Jian

2013, 35(8): 52-53.

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Abstract:Taking Baotou Power Generation Branch of Huadian Inner Mongolia Energy Company Limited as example, the precise spot inspection diagnosis technology was used to diagnose the rotor cage bar fracture of highvoltage twospeed motor for large vertical circulating water pump, and favorable effect was obtained. Using the facilities management mode including precise spot inspection, the predictive maintenance and the condition based maintenance are possible, and the facility accident rate and the cost of maintenance are reduced, and the facilities can operate safely and economically.

Analysis on key technology and construction experiences of 4A platform project of Hainan Power Grid

GAO Peng 1, ZENG Zhixiang 1, LI Weining 2

2013, 35(8): 54-56.

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Abstract:Taking Hainan Power Grid as example, the key technology in 4A management platform construction of power grid information system was analyzed. The 4A is unified account, centralized authentication, centralized authorization and centralized audit. The experiences on system construction project management were summarized. By implementation of 4A system, the security of the power grid information system was improved, and the efficiency of operation and maintenance was increased.

Analysis on experience of response to bad weather and keeping stable operation of unit

ZHOU Yu

2013, 35(8): 57-60.

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Abstract:In recent years, the bad weather, such as snow storm and rain with fog, appeared frequently, which poses a grave threat to stable operation of power transmission lines and power plants. Taking the Inner Mongolia Datang International Togtoh Power Generation Company Limited as example, its experiences in ensuring stable operation of power system and power units were introduced. The security protection prearranged planning or the response strategy of the Togtoh Power Plant against bad weather were analyzed. The result in this paper can be used as reference for treating similar problems.

Analysis on main problems existing in operation of scraper slag conveyer

LONG Weirong

2013, 35(8): 61-62.

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Abstract:Taking the boiler No.1 of Guizhou Huadian Tangzhai Power Generation Company Limited as example, the main problems of scraper slag conveyer existing in process of 168h commissioning were analyzed. The problems needing emphatically attention at present were pointed out. Combining with the actual operation of the power plant, the feasible treatment measures were proposed.

Analysis on reformation of steamdriven induced graft fan of 600MW supercritical unit

HE Wenbo, WANG Qing

2013, 35(8): 63-63.

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Abstract:The capacityextending reformation of the desulphurization system of the 600MW supercritical unit in a power plant was introduced. The advantages of merging the induced draft fan and the booster fan into single one was expounded. According to qualitative analysis and quantitative calculation, it is determined that the reformation will bring significant economic benefit for the power plant.

Analysis on technology of waste heat recovery from exhaust gas of power boiler using lowpressure economizer

FU Yuling, SUN Jiguo, CAI Wei, JIANG Haitao, JIA Minghua, MIAO Yuwang, ZHANG Yubin, WANG Gang

2013, 35(8): 64-66.

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Abstract:The current situation of boiler flue gas waste heat recovery in domestic power plants was introduced. The reasons of higher temperature of boiler flue gas in power plants were analyzed. The domestic current lowpressure economizer scheme, which is helpful to reduce the flue gas temperature and to recover the flue gas waste heat, was expounded, and the matters needing attention were pointed out.

Analysis on type selection and application of waste heat recovery device of boiler periodic blow down flash tank

XIE Yongsheng

2013, 35(8): 67-69.

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Abstract:Taking the Guojiawan Power Plant of Shenhua Shendong Electric Power Company Limited as example, the necessity of exhaust steam recovery was analyzed. The exhaust steam recovery method of periodic blow down flash tank of power plant boiler was introduced. After a waste heat recovery device had been installed additionally on the periodic blow down flash tank of the boiler, the problem of environment pollution was solved, and the energy utilization rate was improved.

Design of standby power source for station service power source of biomass power plant

LIU Sen

2013, 35(8): 70-72.

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Abstract:Combining with the production practice of biomass power plants for recent years, the design schemes of the standby power source for station service power source in each development stage were analyzed and studied. According to the characteristics of the standby power source for station service power source in this field, a more perfect connection scheme was summarized.

Analysis on deviation of computational result of wind turbine generator tower subgrade and foundation design software

SUN Fengli, LI Jianbiao

2013, 35(8): 73-75.

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Abstract:The wind turbine Generator tower subgrade and foundation design software was introduced. The calculation method of eccentricity of the foundation resultant force action point given in file FD 003—2007 “Design regulations on subgrade and foundation for wind turbine generator system” was expounded. Based on this, the two calculation results of the quantity of the reinforcement for the foundation column by the wind turbine generator tower subgrade and foundation design software were analyzed. The conclusion is that the quantity of the reinforcement for the foundation column of the wind turbine tower must be calculated by the amended eccentricity pressure formula.

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