Integrated Intelligent Energy

The use and economical value of pumped storage power station in operation of electric grid

ZHANG Zhenling; CAI Zhenkun

2008, 30(11): 1-3.

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Aiming at the operation features of pumped storage generator set and principle of economical dispatch,the use of pumped storage power station in operation of electric grid was analyzed,which includes peak regulation,frequency regulation,phase regulation,backup for accident,stabilization of grid voltage and others,and these are helpful to relieve of peaking load for thermal power units,to ensure stable and economical operation of thermal power units and nuclear power units and to ensure stability and safety of power grid.The value of the pumped storage station in electricity market was analyzed too.

Analysis of factors influencing measurement accuracy of infrared thermalimaging system

GAO Xiao-ming

2008, 30(11): 4-7.

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The infrared temperature measurement technology is very effective for detection of electrical equipment thermal defects, so the technology is applied widely in electric system. In practical application, the measurement accuracy of infrared thermalimaging system, which is based on the principle of infrared measurement, is influenced by many factors. The problems about this respect were analyzed, and some proposals and measures were given in this paper.

Research on the performance of the screw centrifugal pump

WANG Qiuhong;LIU Chengsheng;ZHU Xiaoming

2008, 30(11): 8-10.

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According to the special structure, design, operating condition, and basic equations of the screw centrifugal pump, the performances, such as head, efficiency, flux, noise and vibration, are analyzed. The analysis can help to develop the design and operating condition of the screw centrifugal pump.

Influence of coal milling system optimal adjustment on boiler efficiency in thermal power plant

WU Xiaodong

2008, 30(11): 11-12.

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Along with the continuous raising of coal price, increase of boiler efficiency is an effective way for tapping potential of coalkfired power plant and increasing of enterprise competitiveness. The milling system optimal adjustment is very important for increase of boiler efficiency. The milling system of Datong Second Power Plant was adjusted by using relevant testing methods of power boiler, the influence of milling system adjustment on the boiler efficiency was analyzed. The analysis provides a foundation for rational technical reformation scheme.

3D-FEM analysis of the spiral casing of hydraulic turbine

WANG Fang;CHEN Zili;WEI Zebing;HUANG Jianguo

2008, 30(11): 13-16.

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The stay ring and spiral casing of hydraulic turbine were analyzed and calculated by using the 3D-FEM analysis, and the stress and displacement calculating result of stay ring and spiral casing under hydraulic pressure test condition were obtained. The calculating result shows that when the yield strength of material is satisfiable, the spiral casing operation will be safety.

Study on electrical braking methods of hydroelectric generator set

HU Qingzhou

2008, 30(11): 17-19.

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Based on analysis of the insufficiency of mechanical braking, the common generator electrical braking method by shorting of stator three phase windings was discussed. According to this, two new braking methods were proposed and schematic diagrams were given. The features and applicable occasions of several electrical braking methods were analyzed and compared. The feasibility and practicability of high voltage side short circuit braking of generator transformer set and reverse connection braking for medium and small unit were pointed out. The discussion in this paper provides the groundwork for the rational selection of electrical braking method in hydropower plant.

Application of the plasma ignition technology in 600MW subcritical boiler

HAN Zhicheng;LI Jianhui;ZENG Yanfeng

2008, 30(11): 20-23.

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The principle of ignition by using plasma burner was introduced. The plasma burner and configuration of its additional system and auxiliary devices in Inner Mongolia Datang International Tuoketuo Power Generation Corporation Limited Project phase IV were discoursed. Based on this, two requirements of coal quality for plasma ignition were put forward. Depending on application the plasma ignition technology in the corporation, the oil free ignition in boiler cold start was realized basically, and requests of boiler temperature raising curve and pressure raising curve were satisfied, so the oil saving purpose was achieved.

Stator core laminating process of hydroelectric generator set

JIAO Xingping

2008, 30(11): 24-27.

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The hydropower generator set is the first 80MW hydropower generator set installed in Xinjiang. The stator core laminating is the key process to control the core quality and to ensure safety operation of the set. The core structure and laminating process were introduced and prepared for reference of the same set in the area.

Desulphurization scheme selection of power station in 10Mt/a oil refining project

ZHENG Ke

2008, 30(11): 28-30.

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The general status of power station in 10Mt/a oil refining project of Guangxi Petroleum & Chemical Corporation of China National Petroleum Corporation was introduced. The selection of its desulphurization scheme was described. Both advantages and disadvantages of limestone gypsum wet desulphurization process and ammonia fertilizer process were compared. Combining with concrete situation of Guangxi Petroleum & Chemical Corporation, a flue gas desulphurization scheme was selected which is accordant with refinery practical situation. This scheme can be used as a reference for similar projects.

Research on optimization of intermediate bin storage type pulverizing system

PEI Gongjie;WANG Yuhe

2008, 30(11): 31-33.

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Aiming at the problems existed in pulverizing system of Dengfeng Corporation Limited of China Resources Power Holdings Company Limited, which includes the high entraining pulverizing coal rate of tertiary air, the rotor of serious wear of the mill fan and high energy consumption for coal pulverizing, the key operation parameters of pulverizing system were introduced in detail, and some concrete measures for comprehensive improvement and optimization of pulverizing system were proposed. The energy saving effect of the pulverizing system is remarkable after the optimized regulation.

Design features of 4×200MW level IGCC project

WANG Hong;TAN Hongjun

2008, 30(11): 34-37.

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Integrated gasification combined cycle(IGCC) generation technology is clean coal generation technology with a broad development prospect. The process flow of IGCC technology was discussed. Aiming at the 4×200MW level IGCC project of one power plant, the process system and equipment selection scheme of the project were introduced in detail. It is pointed out that the construction of IGCC power plant based on home grown technology will promote the development of IGCC generation technology in our country.

Positive pressure sealing design of oil baffle in turbine

CHEN Sheng;HAN Xingquan

2008, 30(11): 38-42.

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To prevent water to be entrapped in the lubrication oil and the oil to leak out from the oil baffle of steam turbine, the clean compressed air can be injected into oil baffle cavity of each bearing shell of the turbine, which flow in both direction of outer space and oil housing, preventing the oil to leak out and the steam to flow into the oil housing. The pressures of the compressed air of the adjustment valves at the inlet and outlet of each bearing shell were determined by detailed calculation of the compressed air flow needed for each bearing shell, the fluid resistance of each bearing shell and the resistance of backair pipe. The oil leakage from the oil baffles and entrapped water into the oil housings of the beating shells were eliminated, the safety operation of turbine in long period was ensured, and a lot of labor forces and material resources were saved due to adopting above mentioned measures.

Prevention and control of air leakage of rotary air preheater

LUO Weijun

2008, 30(11): 43-45.

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Rotary air preheater is heat exchange equipment widely used in large and mediumsize power boiler at the rear. The fatal shortcoming of the equipment is high air leakage factor. The leakage air not only influences the thermal efficiency of boiler and the supply of air flow, but also increases the power consumption of the draft fans, and this leads the increase of both grass and net coal consumption rate. Ten of ideas for prevention and control of air leakage of air preheater were proposed in this paper.

Analysis of an abnormality in the DEH load control and countermeasure for 135MW unit

ZHOU Yuhong

2008, 30(11): 46-48.

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Aiming at an abnormality in the DEH load control of Yuejia Electricity Corporation Limited unit No.6 during remote switching by CCS, the DEH system control logic was examined and analyzed, and the basic reason causing the load to be out of control was fined. The relevant measures were proposed and implemented, and this hidden trouble was eliminated effectively.

The improvement measures for air preheater optimization in 300MW unit

WANG Yuhe;PEI Gongjie

2008, 30(11): 49-50.

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The abnormal current of main motor occurred in air preheater operation was analyzed deeply, the scheme for solving this problem was proposed, and relevant measures were adopted. After the improvement, the air preheater operated safely, and the reliability and economic efficiency of equipment were raised greatly.

Reformation of recirculating valve of feed pump

YANG Jun;SUN Liben

2008, 30(11): 51-52.

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There were problems of sealing untightness and leakage occurred in the feed pump recirculating valve of Liaoning Huadian Tieling Power Generation Corporation Limited. The reasons found by analysis were cavitation, encroachment and attack occurred at the sealing face of the valve seat. The valve structure was reformed by adopting three measures. The sealing and adjustment performance of the reformed recirculating valve are excellent, and leakage fault des not occur again in operation. So a good economical benefit was obtained.

Reason of acid value rise in fire resistant oil and preventive measures

WU Jingfeng;YE Baojuan;XU Renjun

2008, 30(11): 53-54.

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Combining the operation and features of turbine DEH control system in power plant, the reasons of the acid value rise in fireresistant oil were analyzed in detail. Based on the analysis, the detailed preventive management measures were put forward. The obvious effect was obtained due to implementation of the measures, and the expected target was achieved.

Application of intelligent guided wave radar thing location measure instrument in thermal power plant

CAI Lu

2008, 30(11): 55-57.

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A series of problems occurred in application of intelligent guide wave radar thing location measure instruments in 2×300MW coalfired generator set of Guangzhou Hengyun Enterprise Group were analyzed and explained in detail. Some concrete proposals about the mode design and selection, installation and debugging, application and maintenance of the instrument were put forward. It is expected that these are helpful to spread the intelligent instrument.

Application of recirculating zone staged igniting combustion technology in 220t/h pulverizedfuel boiler

DU Bo;ZENG Wenxi;YU Xiaowei;XU Guoliang

2008, 30(11): 58-60.

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The principle of recirculating zone staged igniting combustion technology is as follow: based on the slitting bluffbody burner, a few coal air flow is leaded into the recirculating zone and ignited first, it becomes a ignition source and is used to ignite the main coal air flow, so the staged igniting combustion process is realized, and the combustion of poorgrade coal is strengthening, the flame stability is raised. The technology was applied in a 220t/h pulverizedfuel boiler of a petrochemical enterprise, and good technical, economical indexes were archived.

Research of nondust and nonoil purification technology applied in lower air tunnel of hydroelectric generator

ZHENG Jianfeng;ZHANG Guofang;JIANG Chijian

2008, 30(11): 61-62.

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Elimination of oil mist and dust pollution was always the difficult point and the emphasis in technical reformation of hydroelectric generator lower air tunnel. The nonoil and nondust purification technology applied in lower air tunnel of hydroelectric generator set of Zhejiang Tongbai Pumped Storage Power Station was described and compared with that technology applied in domestic common sets. The discussion in this paper was useful for solving the problem of dust and oil pollution in lower air tunnel of the set.

Reason analysis of tube cracking in platen superheater of boiler

DING Jirong

2008, 30(11): 63-64.

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The accident of tube cracking in platen superheater of boiler in a power plant was occurred soon after putting into operation, and the chink had features of overtemperature in short time and in long time. Combining the features of the chink, according to the metallographic analysis and hardness test of the cracked tube, some possible reasons were excluded which includes heat deviation of tube platen, misoperation of boiler operator and quality of the tube material. It is defined that there was foreign object in the tube which caused the tube operated in overtemperature at long time, so the oxide coating was created. The oxide coating peeled off during the start up and shutdown and blinded the tube, this caused the tube operated in serious overtemperature, and the tube cracking occurred finally.

Analysis of vacuum system operation mode

CHEN Xifa

2008, 30(11): 65-66.

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Aiming at condenser vacuity down problem of 300MW unit of a power plant, the vacuum system design and its thermodynamic process were analyzed according to the principle of vacuum creation in condenser. The influence of vacuum system leakage was discoursed, and some corresponding countermeasures were proposed.

The deterioration reason of generator insulation and countermeasure

ZHOU Da;LI Jianghong;LUO Jingjie

2008, 30(11): 67-68.

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The insulation of the generator No.31 of Sichuan Guangan Power Generation Corporation Limited was deteriorated because of affecting with dampness of air during a long overhaul time. The reason of generator insulation deterioration was analyzed in detail, and the treatment method was presented and prepared for reference.

Microcomputer real time supervisory system of Fenghuang Hydropower Station

CHEN Qiwu

2008, 30(11): 69-71.

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An automatic real time supervisory system of hydropower station was introduced. The functions of the system includes real time data acquisition, primary diagram display, curve diagram and bar graph creating, Chinese report creating, accident comprehensive handling and others. The automation level, safety and reliability were raised due to application of the system, the operators were relieved from traditional, troublesome manual meter reading work, and the hydropower station can run in unattended mode and only few watchman needed.

Optimization of MCS subcontrol system for 300MW units

HE Tongxiang;LIU Huijuan;LIU Huishang

2008, 30(11): 72-75.

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The working principle of control subsystems of unit No.4 in a certain power plant were introduced, the problems existed in the subsystems were analyzed, and some reasonable, feasible optimizing measures were proposed. After perfecting of control plan and optimization of control parameters, the better adjustment quality of control subsystems was achieved, and the requests of the normal operation, the load variation and the RB test can be satisfied.

Analysis of earthresistancereducing agent in engineering projects

CAO Xianping

2008, 30(11): 76-78.

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The earthing resistance of single grounding conductor or grounding grid often can not satisfy the engineering request in some projects, and for these cases the using of earthresistancereducing agent in construction process is necessary. The working principle, the applicable range, the advantages and disadvantages of earthresistancereducing agent were analyzed, and its calculating and using methods were given. It is expected that the discussion in this paper is helpful for the application of earthresistancereducing agent.

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