Power Equipment

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    Testing & Research
  • Testing & Research
    Flow Characteristic Test for Large Steam Turbines
    ZHANG Bao, FAN Yin-long, GU Zheng-hao, WU Wen-jian
    2012, 26(2): 73-76.
    Abstract ( )   Knowledge map   Save
    Setting steam distribution function of steam turbine by flow characteristic test can improve its control precision. To exactly calculate the main steam flow, not only the first stage temperature but also the first stage pressure should be considered. The concept of comprehensive opening of regulating valve is put forward. Taking the whole steam distribution structure as an object, a flow characteristic test method is designed, of which the effectiveness is proved by a 600 MW sub-critical unit.
  • Testing & Research
    Ignition and Flame Stablization Test for W-flame Boiler withDouble Cyclone Burner Using Tiny-oil Ignition Technology
    JIN Huang, XIAO Xian-jin, ZHOU Hao, CAO Wei, PU Xue-sen, WANG Jun
    2012, 26(2): 77-79.
    Abstract ( )   Knowledge map   Save
    To economize the oil consumption during ignition and stabilize low load combustion of W-flame boiler using tiny-oil ignition technology when nonflammable coal is burned, a series of cold modeling, hot and industrial tests have been carried out on the double cyclone burner. Test results show that tiny-oil ignition may be realized at cold state if combustion-supporting wind and multi-step ignition method are adopted; and with low-oil burner, boiler combustion can be stabilized at low load operation. Both of the burners may help to realize the objective of fuel saving.
  • Testing & Research
    Effect of Pulverizing Parameters on Fineness of Coal Powderfrom Medium-speed Mill
    XU Rong-tian, HE Xiang, CHENG Zhi-hai, ZHOU Wen-tai
    2012, 26(2): 80-83.
    Abstract ( )   Knowledge map   Save
    Based on a positive-pressure direct-fired MPS medium-speed mill with cool primary air, the effect of following pulverizing parameters on fineness of lean and bituminous coal powder has been analyzed, such as the impeller speed of separator, mass ratio of air to coal and the hydraulic loading pressure, etc. Results show that at various speeds of impeller, the fineness of coal mixture (70% lean coal+30% bituminous coal) is relatively coarse, with a R90 difference of about 3%; at the same mass ratio of air to coal, the lean coal powder is finer than bituminous coal with also a R90 difference of about 3%; at a hydraulic pressure of 5-8MPa, the R90 difference lies in 1-5%, and the R90 of bituminous coal is higher than that of lean coal.
  • Testing & Research
    Study on Sectional Temperature Field and Fin Thickness of Membrane Wallfor 600MW Super-critical Pressure Boilers
    SU Yong-jun, YANG Jun-bao
    2012, 26(2): 84-87.
    Abstract ( )   Knowledge map   Save
    A mathematical model of finite element for membrane wall of a super-critical pressure boiler has been set up and a simulation on sectional temperature distribution has been carried out with ANSYS 10.0 software. Simulation results show that the highest temperature occurs at the fin end facing the flame along the whole membrane wall, which has a lowest value with the variation of fin thickness. For a 600 MW super-critical pressure boiler, there exists an optimum fin end temperature with the fin thickness in 7-9 mm
  • Testing & Research
    Technical and Economical Analysis on Single- and Dual-trainFan Configuration in Thermal Power Plants
    WU A-feng, TAN Can-shen
    2012, 26(2): 88-92.
    Abstract ( )   Knowledge map   Save
    Type selection of fan configuration directly influences the operation and economic benefit of a thermal power plant. Reliability of single-train fan configuration for units of different capacities is discussed. A technical and economical comparison is made between single- and dual-train configuration of fans, of which the results may serve as a reference for determination of fan configuration for units of different capacities.
    • Conputer & Control
  • Conputer & Control
    Research on Online Monitoring System for Life Lossof Steam Turbine Rotors
    SHENG Lei, YANG Ji-ming, CHEN Jian, HE Jian, HE bing
    2012, 26(2): 93-96.
    Abstract ( )   Knowledge map   Save
    Based on real operation data of thermal power units, temperature and stress field of the steam turbine rotor are calculated by finite element method so as to analyze and determine the position of monitoring surface in the system. Low cycle fatigue life loss of rotor is calculated with a modified one-dimension thermal stress simplified equation. Considering the influence of high temperature creep on rotor life, an online monitoring model for life loss of turbine rotor is established, while an online monitoring system developed. Agreement results between simulation and actual operation data prove the system to be effective.
  • Conputer & Control
    Multi-objective Neural Network Optimization for Boiler Combustion Systems
    WANG Zhi-xin, BAO De-mei, CAO Li-ming, QIN Zheng
    2012, 26(2): 97-99.
    Abstract ( )   Knowledge map   Save
    There are double requirements of both reducing operating cost and decreasing contaminant emission for power station boilers. A boiler combustion model has been obtained with the training of neural network based on combustion data collected, which can be used to forecast the NOx emission and combustion efficiency of the boiler with different combustion parameters. A reasonable balance point is found between high efficiency and low NOx emission of the boiler based on multi-objective optimization and operation data adjustment.
  • Conputer & Control
    Study on Fan Fault Diagnosis Based on Hilbert-Huang Transformand Artificial Neural Network
    WANG Lei, JI Guo-yi
    2012, 26(2): 100-104.
    Abstract ( )   Knowledge map   Save
    Hilbert-Huang transform is applied to fan vibration signal and a marginal spectrum is obtained. Eigenvector of vibration signal of wind turbines is constructed by taking energy ratio of fault bands in the marginal spectrum as elements. Faults such as wind turbine rotor misalignment and axis cracks are diagnosed by momentum method and BP neural network model improved by adaptive learning rate method. The results prove this fault diagnosis method to be effective.
  • Conputer & Control
    Intelligent PID Design for Coordinated Control Systemof 300 MW CFB Power Units
    GENG Xin-wei, ZHANG Yu-fei
    2012, 26(2): 105-107.
    Abstract ( )   Knowledge map   Save
    In the light of the coordinated control system of CFB power unit, a genetic calculation will be adopted for optimizing multivariable PID control parameters. Combined with the advantages of both PID and fuzzy controls, a fuzzy adaptive PID control way is adopted to realize the real-time adjustment of the PID parameters based on continuous revision of PID parameters during load variations. A simulation test has been carried out against the model of the coordinated control system of CFB power unit. Test results show that better control effect can be obtained with this method.
  • Conputer & Control
    Design & Application of SCADA System in 1.25 MW Wind Farms
    YU Wen-sheng, SHI Lei
    2012, 26(2): 108-110.
    Abstract ( )   Knowledge map   Save
    The supervisory control and data acquisition (SCADA) system of 1.25 MW wind farm is used to perform data acquisition and control for each wind turbine in the farm, which has the functions of start/stop control, operating status display, temperature history display and wind rose display. The system has also the remote login function which makes it possible for the user to remotely browse and control the operation conditions of the wind turbine. The way of real-time data collecting and sectional storage may help to raise the speed of data collection and the reliability of data storage, which therefore can meet the supervision & management requirement of wind farms.
    • Operation & Retrofit
  • Operation & Retrofit
    Measurement and Handling of Vibration in a 420 t/h Oil-fired Boiler
    DUAN Li-hong, ZOU Xian-hong
    2012, 26(2): 111-114.
    Abstract ( )   Knowledge map   Save
    To solve the problems of furnace vibration frequently occurring in a 420 t/h oil-fired boiler during early stages of operation, experimental tests has been carried out by changing the operating mode, oil pressure, oil amount and atomizing steam pressure of the oil burner, etc. Results show that the vibration can be reduced if the oil burner is put into operation one by one and the values of oil amount, oil pressure and oil-steam pressure difference are all kept high.
  • Operation & Retrofit
    Abrasion of 1 025 t/h CFB Boiler and its Handling
    WANG Yan, ZHANG Hui, YANG Wei, YAN Xiao-zhong, ZENG Xiao-yan, WANG Yong
    2012, 26(2): 115-118.
    Abstract ( )   Knowledge map   Save
    Combined with the operational practice of CFB boiler in Baima Power Plant, Sichuan, the causes of abrasion have been analyzed at the sections like furnace water wall, end heating surface, wind cap and refractory material, etc., for which countermeasures have been put forward such as arranging water wall tubes away from the anti-abrasive boss, or applying spray technology for relevant parts. Above anti-abrasive measures are proved to be effective in reducing the abrasion of CFB boilers.
  • Operation & Retrofit
    Countermeasures for Decreasing the Auxiliary Power Consumptionof 1 025 t/h CFB Boilers
    WANG Xu, LIU Ping-yuan, YAN Wei-ping
    2012, 26(2): 119-121.
    Abstract ( )   Knowledge map   Save
    The causes leading to high auxiliary power consumption of a 1 025 t/h CFB boiler have been analyzed and the necessity of decreasing the auxiliary power consumption has been emphasized. Actual practice and corresponding effect have been presented for reducing the auxiliary power consumption by equipment retrofit and operational mode optimization, together with some suggestions proposed for management of productive and non-productive power.
  • Operation & Retrofit
    Reliability Analysis on Operation of 600 MW Boilers Burning Poor Coal
    PENG Nan, XING Xi-dong
    2012, 26(2): 122-124.
    Abstract ( )   Knowledge map   Save
    To solve the problems existing in thermal power boilers caused by deviation of coal quality from designed condition, an experimental study has been carried out on a certain power plant by blending poor coal to its original fuel, after which countermeasures are put forward on the respects like coal blending, auxiliary equipment retrofit and operation of boiler operation & maintenance, so as to raise the reliability of boiler operation.
  • Operation & Retrofit
    Application of 240 t/h CFB Boiler Purely Burning Petroleum Tar
    HAN Wei, WANG Li-li
    2012, 26(2): 125-128.
    Abstract ( )   Knowledge map   Save
    Properties of the petroleum tar burning in Carri 4 Power Plant, Sudan, have been described combined with the commissioning work of its 2×240 t/h CFB boilers purely burning petroleum tar. There is low sulfur content in the petroleum tar but with poor stability of firing and the trend of slagging, so there is no need to put any limestone into the furnace of boiler domestically designed & manufactured. Some problems have been analyzed like high carbon content in fly ash, too much slag leakage from air chamber and castable cracking in material-returning leg, for which countermeasures are put forward.
  • Operation & Retrofit
    Structure Features of Brush Seal and its Application in Power Plant Retrofit
    SHEN Xian-nian, SHI Wei-wei
    2012, 26(2): 129-130.
    Abstract ( )   Knowledge map   Save
    Structure features and working principles of brush seal and its application at home and abroad are described. Taking the brush seal retrofit of a 600 MW turbo-generator unit in Harbin No.3 Electric Power Plant as an example, parameter selection of the brush seal and corresponding attention points are analyzed. Economical benefits of the 600 MW turbo-generator unit after brush seal retrofit is presented simultaneously
  • Operation & Retrofit
    Measures for Efficiency Improvement of Self Cleaning Device in GasTurbine Air Inlet Systems
    ZHANG Quan-fu
    2012, 26(2): 131-133.
    Abstract ( )   Knowledge map   Save
    Combined with the operation practice of 2×V94.3A gas turbines in Zhenzhou Gas Power Generation Co., LTD., the efficiency decreasing reason of the self cleaning device in air inlet system is analyzed. Improvement and optimization measures are put forward from aspects of the back blow air supply for air inlet filter, the filter core material and its operation mode. Obvious effects have been obtained after the improvement measures are taken. Each year, about 370,000 RMB operation cost can be saved by the 2 units.
    • Material & Technology
  • Material & Technology
    Property Requirements and Technological Measures of a Based Metalfor Reactor Pressure Vessels with an Expected 60-year Life
    SHI Yao-xin, TIAN Hong-zhi
    2012, 26(2): 134-137.
    Abstract ( )   Knowledge map   Save
    Development history of the base metal SA508-III for reactor pressure vessels (RPV) is briefly introduced. Regarding the requirements to extend RPV design life from 40 years to 60 years, it is pointed out that irradiation embrittlement by fast neutrons is one of the key factors that influence PRV life. Influencing factors of material irradiation embrittlement are analyzed and technical improvement measures are put forward. Specific requirements of chemical composition and mechanical properties of the forgings at core section of a 60-year life AP1000 reactor are descried with an example. In addition, hot forging processing technologies are summarized simultaneously.
    • Environmemtal Technology & Equipment
  • Environmemtal Technology & Equipment
    Design of SNCR System for Refuse Incineration Power Plantand the Application Example
    LI Jun, CHEN Zhu, WANG Zhan-lei
    2012, 26(2): 138-140.
    Abstract ( )   Knowledge map   Save
    With the rise of environmental requirements on refuse incineration power plants, it‘s difficult to control NOx generated by refuse incinerators within relevant specifications only by low NOx combustion technology, so Selective Non-catalytic Reduction (SNCR) technology is used in the meantime. By the comparison of three commonly used methods to reduce NOx content, SNCR technology is found to be suitable for the current status in China for flue gas treatment. Technical process and equipment configuration of SCNR systems are introduced, while the consumption of reducing agent (urea) calculated with an example.
    • Cleaning Energy
  • Cleaning Energy
    Quality Management Status of Domestic Wind Power Equipmentand the Countermeasures
    REN Yan-zhong, NIU Hai-feng
    2012, 26(2): 141-144.
    Abstract ( )   Knowledge map   Save
    Regarding the current status of more and more furious price competition and quality reduction of wind turbine caused by the fast development of wind power industry, the reason of quality issues generated in manufacture of wind turbine and turbine blade, and its influences on the operation safety, are concluded and summarized. Countermeasures by contract guarantee and equipment supervision are put forward, while implementation proposals suggested.