Integrated Intelligent Energy

Application of series resonance with variable inductor and variable frequency in generator test

CHENG Jianfeng

2010, 32(12): 1-3.

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The requirements and the fundamental of the AC withstand voltage test using the series resonance with variable inductor and variable frequency were introduced. Based on this, the application characteristics of the series resonance with variable inductor and variable frequency in power system were analyzed, and the application of the series resonance with variable inductor and variable frequency in Hubei Xisaishan Power Generation Corporation Limited was expounded.

Application of stator slot coupler method in partial discharge monitoring of generator

CHEN Zhigang;LIN Lingzhi;WANG Leiming

2010, 32(12): 4-6.

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The composition of the stator slot coupler online monitoring system was introduced. The occurring conditions and the harm of partial discharge of generator were analyzed. Based on this, the monitoring methods of generator partial discharge signal were expounded.The stator slot coupler method is very effective, which is one many monitoring methods of partial discharge signal.
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Analysis and treatment on fault of seal oil system of 300MW steam turbine generator set

MA Baohui;NI Tao;ZHANG Xuemin

2010, 32(12): 7-8.

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The hydrogen purity of the generator in unit No.2 of Huadian Weifang Power Generation Corporation Limited was reduced too fast, the hydrogen exhaust/fillin quantity was larger, the air side DC oil pump often started up in interlock mode. All problems listed above were analyzed. The defects existed in the seal oil system of the generator have been improved, and the problems mentioned above were solved finally.

Analysis on reactive power compensation of highvoltage asynchronous motor

GU Juming;FAN Yongwei

2010, 32(12): 9-11.

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Using the capacitors connected parallel with threephase asynchronous motor to realize reactive power compensation for raising the total power factor is the widelyused method for increasing the motor operation power factor. Based on the analysis of operation characteristics of highvoltage asynchronous motor in pump station of water conservation project with different load factor, a new method to select the capacity of the capacitor parallel connected with three phase highvoltage asynchronous motor was put forward. Favorable compensation effect of the motor reactive compensation capacity configured by this method was obtained in practical operation.

Analysis on reasons of differential protection action of aircooled generator

CHEN Riguang

2010, 32(12): 12-13.

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The principle and the cooling system of QFW-6-2 aircooled generator were introduced. The reasons of the faults, which caused the differential protection action two times during the generator debugging period, were analyzed. The relevant measures were adopted, and the generator operation became normal.

Simulation research and application of evolutionary game theory based on Repast

GU Hongchao;HUANG Xian

2010, 32(12): 14-17.

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The evolutionary game theory is new development of the game theory. It initially arose from biology domain; along with the indepth study, the scientists introduced it into other fields gradually and have unearthed its important significance. There are mainly two methods to research the evolutionary game theory at present, one is analytic method, and another is computerbased simulation method. The Repast is one of the frequentlyused multiagentbased modeling and computer simulation platforms. Using the Repast simulation platform, packet the existed model (copied dynamical equation of state); carry out the simulation study under given conditions; use this method in electricity market to simulate the bidding behavior of the power generation enterprises. During simulation process, the dynamic processes of various power generation enterprises adopting different game strategies were well incarnated by the platform, and finally tended to their own equilibrium. The conclusion obtained by simulation is basically in accord with that obtained by analytic method.

Cold start and optimized combustion adjustment of 330MW subcritical boiler

WANG Chaoyang;DU Jianqiao;ZHOU Ruoming

2010, 32(12): 18-21.

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The implementation procedure of boiler cold start without oil was introduced. The problems of plasma ignition system and MPS190 coal pulverizing system with medium speed mill occurred in cold state and hot state trail running were analyzed, and relevant treatment methods were given. By the combustion adjustment with load, the highefficient, safe and stable operation of the boiler during trail running period was realized. In whole startup debugging period, some key links were realized, which included the cold start and hot start without oil, the pipe blowing, the load rejecting, the combustion stabilizing in low load and the shutdown with variable parameters; a great amount of fuel oil was saved; and favorable economic and social benefits were obtained.
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Design and realization of data mining system for economical operation pattern of thermal power generation units

LI Zongshan;;HUANG Xiaobin

2010, 32(12): 22-25.

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The application of data mining in thermal power plant was introduced. A data mining algorism based on similarity analysis technology was put forward. On this foundation, the unit economical operation pattern data mining system based on the VS2005 platform and the SQL Server 2005 database was developed. The system structure and functions were analyzed, and the design process of main modules of software system was expounded. The system had been applied in practical production data of power plant successfully, the mining result of unit economical operation pattern was obtained, the incremental mining method was realized, and excellent effects were obtained.

Practice of safety technique management for gantry crane manufacture in hydropower stations

YU Manye;YE Jing;YUAN Jianhua;GU Yanjing

2010, 32(12): 26-28.

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Combining with the manufacture process of the MQ2000/400 kN bidirectional gantry crane in Sichuan Zipingpu Hydropower Station, the experiences of safety technique management in gantry crane manufacture of hydropower station were introduced, which have referential significance for the implementation of file SL 425—2008 ‘Safety rules of lifting appliances for water resources and electric power construction’. 

Variable frequency reformation of condensate pump in 300MW unit for energy conservation

DENG Chaoxu;YAO Zhongdong;ZHANG Mengmeng

2010, 32(12): 29-31.

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The operation principle of the high voltage frequency converter was introduced. The variable frequency reformation scheme of 300MW unit condensate pump in Yaomeng Power Generation Limited for energy conservation was described, and its operation mode, its control logic and its investment benefit were analyzed, providing a reference for similar units in their high voltage variable frequency reformation. 

Application of supercapacitor energy storage technology in distributed power generation system

LIU Wei;KANG Jitao;LI Shan;CUI Junfei

2010, 32(12): 32-33.

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The basic theory and classification of the supercapacitor energy storage system were introduced. The functions of the energy storage technology in distributed power generation system were analyzed. The basic structure of the supercapacitor energy storage system was expounded. The supercapacitor energy storage system can enhance the energy source utilization rate of distributed generation system and improve the stability, reliability and economic efficiency of distributed power generation system.

Field dynamically balancing technology for rigid rotors of thermal power plant

CAO Jingfang;LI Shengwei

2010, 32(12): 34-36.

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The concept of rigid rotor and the basis of rigid rotor classification were introduced. The reasons of rotor unbalance fault were analyzed. The classification and characteristics of the unbalance faults were expounded. The method for field dynamically balancing was given. By listing some examples, the experiences of field dynamical balance handling were summarized. 

Design features of the new type unloader

CHENG Wenguang;ZHAO Haiyan;WU Junfeng

2010, 32(12): 37-39.

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The technical parameters, the working principle, the structure features and the electrical control system of the new type unloader were introduced. Comparing with the traditional unloader, the plough tripper and other belt unloading devices, the new type unloader has advantages of accurate allocation, convenient unloading, stable operation, rational structure, good sealability, high efficiency and longer service life. The new type unloader can be widely used in many vocations, such as the industries of electric power, coal, grain, metallurgy, chemical industry, port and the construction materials. 

Reformation and optimization for waste heat recovery of rollingcylinder slag cooler in 490t/h CFB heatsupply unit

GUO Zengliang;YUAN Xiongjun

2010, 32(12): 40-43.

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Three feasible reformation schemes for waste heat utilization of the cylindrical slag cooler in 490 t/h CFB boiler of a power plant were put forward, and their economic efficiencies were analyzed and compared by using the equivalent enthalpy drop method. It is pointed out that the better economic efficiency for waste utilization can be obtained by using the cooling water with temperature as high as possible and its quantity as less as possible. Aiming at the characteristics of the heatsupply unit, a ‘combined switchovertype’ scheme for slag cooler waste utilization was put forward, and the contradiction between the highefficiency and safety of CFB slag cooler waste heat utilization in heatsupply unit was solved effectively. 
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Using MF+RO+EDI integrated membrane method to produce chemical make up water for power plant

WANG Renlei;LI Hao;HE Caiyan

2010, 32(12): 44-46.

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In a north waste incineration power plant, the underground water from deep well was treated by MF+RO+EDI integrated membrane method and used as chemical make up water. The design of the system process, the equipments and the operation conditions were introduced, and the problems existing in the system were analyzed. The practice shows that using the MF+RO+EDI technology, the quality of the output water can perfectly accord with the water quality standard of chemical make up water, and the system operates stably and reliably. 

Influence of bypass control for high and middle pressure main steam of steam turbine on water level in steam drum

WANG Zijin

2010, 32(12): 47-50.

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The control mode of the steam turbine main steam bypass system of M701F gassteam combined cycle unit manufactured by the Japan Mitsubishi was introduced. Combining with the matched action process of the bypass valve and the main steam control valve during the unit starting up process, the reasons of the fast falling of the water level in middlepressure steam drum were analyzed. The preventive measures and operation proposal were put forward. After adjustment of open speed of the high and middle pressure steam adjusting valve, the fluctuation of the water level in steam drum was decreased effectively, and the unit safe startup and shutdown were ensured. 
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Analysis on reason of induced draft fan stall of 600MW unit and countermeasures

LIU Tao

2010, 32(12): 51-53.

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The characteristics and technical parameters of induced draft fan of the boiler with bagtype dust remover in a power plant were introduced. Based on this, the reasons of induced draft fan stall were analyzed. The relevant measures were adopted, and favorable effects were obtained.

Analysis on exergy efficiency of 600MW ultrasupercritical boiler

ZHAO Zhongdong;XUE Qinghong

2010, 32(12): 54-56.

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Based on the thermodynamic exergy analysis, the mathematical expression of boiler exergy efficiency was established. For a selected condition, the exergy loss and the exergy efficiency of a 600MW ultrasupercritical boiler were calculated. The calculation shows that the exergy analysis method can reflect various losses and their happening position of power plant boiler more comprehensively. In order to tap the potential of energy conservation and to enhance the economical efficiency of the boiler, the measures for decreasing the exergy loss were put forward.

Chemical indepth debugging technology for ultra supercritical units

LU Guohua;FAN Shengping

2010, 32(12): 57-58.

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According to the technical characteristics of ultra supercritical unit, the debugging process of the chemical system and the site debugging experiences, the chemical indepth debugging technology of newbuilt ultra supercritical unit was expounded considering the optimization of chemical debugging process, the performance test of the chemistry equipments and the adjustment of the chemical operation conditions, to provide technical reference for optimizing the chemical debugging process and enhancing the chemical debugging quality. 

Upper air maintenance technology for metal framework of largescale carnage equipment

WANG Shanqiao

2010, 32(12): 59-60.

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According to the features of major engineering works, implementing upper air maintenance for fracture crack and distortion of largescale tower crane metal structure and other metal structure in the building construction spot is the most effective method for reducing expenses and equipment maintenance time. However, there is safety risk and technical difficulty lying in this method, only the enthusiasm and creativity of the specialized technical personnel is comprehensively performed can the technical difficulty of safety construction of metal structure upper air maintenance be solved. This article puts forward relevant methods and innovative principle advices by cases for the reference of the industrial technical personnel.

Analysis on safety of heating surface in boiler starting up process and control measures for overtemperature prevention

XU Juntao;LIU Zhijie

2010, 32(12): 61-63.

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Some problems occurred in starting process of the 300MW boiler of Second Electric Power Branch of Henan Zhongfu Industry Corporation Limited, which include larger temperature difference between the drum’s upper wall and lower wall, serious overtemperature of the low temperature overheater, greater fluctuation of the air preheater current. Due to these problems, the control of whole starting time became more difficult, the life of the metal materials were imperiled seriously; and the long ignition time will cause increase of the fuel oil consumption and decrease of generated electricity.In this paper the safety of the heating surface in boiler starting process was analyzed, and the measures for overtemperature prevention were put forward, which were summarized according to many times starting practices. 

Application of coal storing technology using paralleling multisquare bunkers in large coalfired power plant

LUO Yudong

2010, 32(12): 64-67.

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The technical features of the current main coal storing modes in large coalfired power plant were described briefly, and the coal storing technology using paralleling multisquare bunkers was introduced emphatically. Combining with the coal yard extension scheme for 1000 MW units of a power plant in Eastern Guangdong, the technicaleconomical comparison between the paralleling multisquare bunkers mode and other coal storing modes was carried out. The application conditions of coal storing technology using paralleling multisquare bunkers in large coalfired power plant were expounded. 

Reformation of backup plate of dumper using hydraulic pressure system

LI Senmin

2010, 32(12): 68-68.

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There was larger impulsive force in leaning and returning of dumper body in China Huadian Fularji General Power Plant, which can damage the vehicles and the equipment. A reformation scheme was proposed, in which the original fixed dumper backup plate was replaced by removable backup plate, and the plate was driven by hydraulic pressure cylinder. After the reformation, the impulsive force in dumper and returning were eliminated completely, and the equipment operation became more stable.

Analysis on fault of lubrication oil pressure falling in steam turbine and treatment measures

YANG Jianping;YANG Chengqiang;CAO Dinghua

2010, 32(12): 69-70.

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Aiming at the fault of oil pressure falling in unit No.2 of Baotou Power Generation Branch of Inner Mongolia Huadian Energy Corporation Limited, under the premise of safety of main machine, the lubrication oil system test was carried out to make prejudgment. And after the unit shutdown, the oil system was inspected, and it was found that the power oil inlets of oil ejectors No.1 and No.2 of main machine lubrication oil system of unit No.2 were blocked by foreign bodies. The reason of lubrication oil pressure falling was found, the problem was solved successfully. 

Analysis on key technologies of flue gas denitration using selected catalytic reduction method

ZHANG Jie;MA Junbiao;HU Yongfeng;ZHANG Yang

2010, 32(12): 71-74.

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The present situation of flue gas denitration market of our country was analyzed. The key technologies of SCR denitration process were expounded, which include the selection of ammonia injection device, the simulation experiment of flow field, the design of SCR reactor, the design of denitration gas duct and ash hopper, the selection of catalyst type, the denitration system debug, the operation, maintenance and management of the denitration system. Aiming at the domestic denitration project construction, several suggestions were put forward.

Application of selective catalytic reduction deNOx technology in Guangzhou Zhujiang Power Plant

DUAN Xiaoyun

2010, 32(12): 75-77.

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Taking the Guangzhou Zhujiang Power Plant as an example, the characteristics of the selective catalytic reduction deNOx technology were introduced; the practical application of the technology was analyzed. It was expected that this paper can provide some references for similar units.

Analysis on chimney operation conditions and anticorrosion reformation scheme

CHEN Jianjun

2010, 32(12): 78-80.

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The desulphurization technical reformation project of the 2×135MW unit of Zhoukou Longda Power Generation Corporation Limited and the unit chimney were introduced. The chimney operation conditions and the influencing factors were analyzed. The anticorrosion reformation scheme of the chimney was put forward, and the operation regulating measures for the chimney before anticorrosion reformation were given too. 

Method for wind power unit type optimizing selection in wind power plant construction

ZHANG Wenzhong;FAN Wei;LIU Qingchao

2010, 32(12): 81-83.

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The optimized type selection of wind power unit influences on the income from investment of wind farm significantly. Using the neural network model to estimate its total investment, and carrying out the economical and technical comparison on various kinds of units by using the wind farm life cycle costbenefit model, the optimized unit type selection can be realized. Taking the unit type selection of a wind farm as an example, the optimized method was analyzed and demonstrated, the result shows that the method is feasible and has theoretical and practical values.

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