Power Equipment

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  • Topic Review
    Development of Chinese Gas Turbine Power Stations
    Gao Nanxing
    2014, 28(2): 75-80.
    Abstract ( )   Knowledge map   Save
    An introduction is being presented to the development of Chinese gas turbine power stations in the past, at present and in the future according to years of materials, together with a summery to the distribution and main parameters of gas turbine power stations, which may serve as a reference for relevant departments.
    • Research & Analysis
  • Research & Analysis
    Study on Intelligent Combustion Optimization of Boilers
    Yin Lingxiao, Wang Mingchun, Shang Qiang
    2014, 28(2): 81-85.
    Abstract ( )   Knowledge map   Save
    According to the experimental data of boiler combustion characteristics, response models of NOx emission and thermal efficiency during boiler combustion process were established using support vector machine (SVM). By respectively optimizing the model parameters and boiler operating parameters with particle swarm optimization algorithm, an optimum combination of operating parameters was obtained, in which case the NOx mass concentration can be lowered and the thermal efficiency can be improved, which provides an effective means to realize the optimization objectives of high efficiency and low pollution for power station boilers.
  • Research & Analysis
    Effects of Surge Tank Pressure on Back Pressure of Steam Turbines
    Tao Ye
    2014, 28(2): 86-89.
    Abstract ( )   Knowledge map   Save
    To study the effects of surge tank pressure on heat economy of steam turbines, an analysis was carried out to the influence of variation of both the turbine gland seal system and steam extraction system on back pressure of the steam turbine by calculation. Ideal surge tank pressure and corresponding turbine back pressure were calculated based on commissioning and operation data of an actual power plant, when good economic efficiency was obtained by the unit.
  • Research & Analysis
    Thermal Stress Control Strategy for Startup Procedureof CPR1000 Nuclear Turbines
    Huang Haiyue, Yang Yu, Shi Zhaoyuan
    2014, 28(2): 90-93.
    Abstract ( )   Knowledge map   Save
    An introduction is being presented to the automatic startup procedure of Yangjiang CPR1000 nuclear turbine, the monitoring, calculation and assessment of the thermal stress during startup process, the calculation method of temperature difference allowance, the thermal stress control strategy for the startup procedure, and the temperature criteria for the sequential control of the turbine’s automatic startup procedure, etc., together with an analysis to the features of control strategy for automatic startup procedure of Yangjiang CPR1000 nuclear turbine.
  • Research & Analysis
    Finite Element Simulation on Water Wall of Waste Heat Boilers
    Jiang Pengyi, Wang Jian
    2014, 28(2): 94-96.
    Abstract ( )   Knowledge map   Save
    A mathematic model was established for water wall of waste heat boilers, based on which simulation analysis was conducted to the water wall of waste heat boiler QCF82/1250-53-4.6 with Ansys12.0 finite element software. Distribution of the temperature filed, heat flux, and thermal stress in the water wall were finally obtained through modeling, gridding, loading conditions and solving. Results show that the highest temperature appears at the central axis of each fin, and the highest heat flux is located at the weld between the fin and water wall tube; the thermal stress is relatively well distributed, while the shear stress is concentrated on the surface of water wall tube and at the weld between fin and tube.
  • Research & Analysis
    Application of Intelligent Hydraulic Soot BlowingSystem in Boiler Furnace
    Wen Handong
    2014, 28(2): 97-99.
    Abstract ( )   Knowledge map   Save
    Aiming at the condition that both the soot blowing mode and the blowing effect for boiler furnace were not ideal in the past, an intelligent hydraulic soot blowing system was put forward, in which the ash deposition on furnace membrane wall is measured by intelligent heat flux transducers, and the soot blowing program is controlled according to decision of the intelligent system, and completed by a hydraulic soot blower. Practical experience indicates that the application of intelligent hydraulic soot blowing system in boiler furnace can locate the coking position on the membrane wall, improve soot blowing efficiency, prevent thermal impact on un-coked area by cold water and therefore avoid possible metal cracks produced thereby.
  • Research & Analysis
    Analytical Study on Field Mode Vibration Tests for Generator Stator Cores
    Yang Jun, Ma Bin, Wu Hongtao, Hu Zhongqiang, Ren Lei
    2014, 28(2): 100-106.
    Abstract ( )   Knowledge map   Save
    To prevent the turbo-generator units from producing resonance between the elliptic modal vibration frequency of stator core and the twice frequency of radial electromagnetic force of motor during normal operation, it is necessary to conduct modal vibration tests to the stator core. Combining with the examples of a number of typical turbo-generator units, specific methods and features of modal vibration tests conducted during unit overhaul are introduced, including matters needing attention for the modal test. It is pointed out that the field modal vibration test to stator core is currently a very good compliment to safety monitoring of the generators.
  • Research & Analysis
    Thermal Control and Protection Measures Adoptedby Single-row Configuration of Auxiliary Equipment
    Zhou Shijie
    2014, 28(2): 107-110.
    Abstract ( )   Knowledge map   Save
    Aiming at the reliability of large-sized auxiliary equipment and considering the condition that all the main auxiliaries of a 600 MW unit in Bulian Power Plant of Guodian & Jiantou Inner Mongolia Energy Investment Co., Ltd. adopt single-row configuration, which has experienced decrease in reliability of the system in comparison with double-row configuration, measures are taken from the aspects of instrumentation configuration and logic design, etc., after which safety and reliable operation have been obtained for the unit.
    • Material & Technology
  • Material & Technology
    Sensorless Control Technology for Permanent MagnetSynchronous Motor of Wind Power Converters
    Fu Mingxing, Lü Jie, Zhang Yong, Lin Jian
    2014, 28(2): 111-114.
    Abstract ( )   Knowledge map   Save
    According to the important role of sensorless control technology for permanent magnet synchronous motor (PMSM) of megawatt direct-drive wind power converter, an estimation algorithm based on back electromotive force closed phase-locked loop (PLL) of motor was proposed, to which, simulation and test verification were conducted. Results show that the PMSM position can be calculated accurately by the estimation algorithm so as to achieve effective control over the PMSM in direct-drive wind power generation systems.
    • Operation & Retrofit
  • Operation & Retrofit
    Difference between IGCC Gas Turbine andConventional Gas Turbine and Relevant Retrofits
    Cai Zhijie
    2014, 28(2): 115-118.
    Abstract ( )   Knowledge map   Save
    An introduction is being presented to the difference between IGCC gas turbine and conventional combined-cycle gas turbine (CCGT) in terms of the fuel, combustion mode and operating characteristics, as well as the current retrofit methods of main manufacturers in the world for IGCC gas turbine, which may serve as a reference for equipment selection and operation optimization of relevant gas turbine units.
  • Operation & Retrofit
    Steam Distribution Optimization Test for High-pressureRegulating Valve of a 1 036 MW Steam Turbine
    Jiang Yong, Huang Xupeng, Lin Chuwei, Deng Fei, Sun Weipeng, Feng Tingyou
    2014, 28(2): 119-123.
    Abstract ( )   Knowledge map   Save
    Aiming at the condition that the economical efficiency of an ultra-supercritical 1 036 MW steam turbine is relatively low under partial loads as its high-pressure main steam control valve adopts the single-valve steam distribution mode at startup stage and low-load period, which is transferred to sequential valve steam distribution model under high load conditions, analysis and test verifications were conducted to different steam distribution schemes for such type of units in terms of safe operation and economical efficiency. Test results indicate that the optimized steam distribution scheme can reduce the coal consumption for power supply by 0.3~3.9 g/(kW·h), which is of great importance to energy saving and consumption reduction of the unit.
  • Operation & Retrofit
    Effects of Circulating Water Temperature and Circulating Pumps’Operating Mode on Economic Efficiency of the Thermal Power Unit
    Yang Zhiguang, Yan Litao
    2014, 28(2): 124-127.
    Abstract ( )   Knowledge map   Save
    Effects of both the inlet temperature and flow rate of circulating water on the unit exhaust steam pressure were respectively calculated by the method of quantitative analysis, based on which optimal operation modes of the circulating water pump were obtained under different circulating water temperatures, which may serve as a reference for economic dispatch of the circulating water system.
  • Operation & Retrofit
    Optimization of Valve Flow Characteristic Curvesfor Domestic 600 MW Supercritical Turbines
    Xu Sidun, Lai Jialiang
    2014, 28(2): 128-132.
    Abstract ( )   Knowledge map   Save
    To improve the valve response characteristics to unit load and the primary frequency modulation capability of gas turbine, a method to test the valve characteristics and to optimize its flow characteristic curves was proposed, based on operation practice of a 600 MW unit after overhaul. Results show that the load fluctuation in switching process of valve control mode is relatively small and the primary frequency modulation capability of unit is enhanced after optimization of the valve flow characteristic curves.
  • Operation & Retrofit
    Uprating Retrofit to Hydrogen Cooler of a 600 MWTurbo-Generator
    Ji Yongfu
    2014, 28(2): 133-134.
    Abstract ( )   Knowledge map   Save
    To solve the problem occurring in operation of a 600 MW generator, the necessity and feasibility to conduct an uprating retrofit to its hydrogen cooler are analyzed. Performance parameters of both the generator and its hydrogen cooler are compared before and after retrofit. Results show that the generator can operate safely and stably after retrofit.
  • Operation & Retrofit
    Retrofit and Analysis on Separator of a 690 t/h CFB Boiler
    Zhuo Gang
    2014, 28(2): 135-137.
    Abstract ( )   Knowledge map   Save
    To solve the problems existing in a 690 t/h ultra high-pressure CFB boiler, such as poor safety of the center tube hanger for separator and low separation efficiency due to flue gas shortcut, a retrofit was taken to the flue gas separator by replacing the center tube and the reducing connection at flue duct inlet. Practices indicate that the particle size of fly ash reduces greatly after the retrofit, which helps to solve the problems of too high bed temperature at boiler lower part and too large temperature difference between upper and lower part of the furnace, resulting in up-to-standard SO2 emission of the boiler.
  • Operation & Retrofit
    Design and Model Selection for Circulating Water System of 600 MWSupercritical Units at Southern Coastal Areas of China
    Huang Miaozhuang, Zhao Guoqin
    2014, 28(2): 138-140.
    Abstract ( )   Knowledge map   Save
    To solve the long-standing problem of high pressure existing in the condenser of domestic 600 MW supercritical thermal power units at southern coastal areas of China during summer time due to low circulation factor and high temperature rise selected for design of their circulating water system, the feasibility to change the model selection was studied. It is proposed that the circulation factor no less than 75 folds and the design temperature rise of circulating cooling water no greater than 7 K shall be taken into account during equipment selection of circulating water system at southern coastal areas of China.
  • Operation & Retrofit
    Study on Key Technologies for Engineering Applicationof Factory-level AGC
    Li Ke, Wan Wenjun, Li Jun
    2014, 28(2): 141-145.
    Abstract ( )   Knowledge map   Save
    To solve the problem that the current AGC system functions can not give comprehensive considerations to the operation economy of the whole power plant, the concept of factory-level AGC was put forward, to which corresponding solutions were proposed for its application, with focus on the system construction, assessment decision function, acquisition of performance curve, improvement of load variation rate and relevant optimization measures, etc.
    • Environmental Technology & Equipment
  • Environmental Technology & Equipment
    Application of Low-nitrogen Combustion Technologyin Optimization of 220 t/h High-pressure Boilers
    Yin Shengwei, Gao Qingkun
    2014, 28(2): 146-148.
    Abstract ( )   Knowledge map   Save
    Aiming at the current status that the NOx emission mass concentration from combustion system in the 220 t/h high-pressure boiler of Sinopec Yizheng Chemical Fibre Co., Ltd. had gotten up to 750~1 100 mg/m3, a low-nitrogen combustion retrofit was conducted to the boiler, after which the NOx emission mass concentration was reduced by over 50% to be within 350 mg/m3, realizing a good NOx emission reduction effect.
  • Environmental Technology & Equipment
    ptimization Retrofit on Denitrification Dilution Air System of Boilers
    Hao Jian
    2014, 28(2): 149-151.
    Abstract ( )   Knowledge map   Save
    To solve the problems existing in a 1 025 t/h boiler, such as high energy consumption in the flue gas denitrification dilution air system, great vibration of the dilution fan and insufficient volume of the dilution air, a retrofit scheme was put forward by introducing partial air from the primary air system as dilution air, to which the feasibility and economic benefits were analyzed. Application results show that taking a small part of primary air as dilution air not only has no influence on boiler operation, but also improves the economical efficiency and reliability of the denitrification system.