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    Research & Analysis
  • Research & Analysis
    Real-time Evaluation on Operation Economy of Thermal PowerUnits Based on Data Envelopment Analysis
    Wang Aichen, Wang Wenhuan, Pan Weiguo
    2014, 28(5): 313-316.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking a 600 MW power unit as an example, an evaluation was performed to relative effectiveness of its real-time operating data based on real-time operating efficiency model built up by data envelopment analysis using economic indicators reflecting operating efficiency of thermal power units, after which target values of relevant thermal parameters were put forward for the operating status with low relative efficiency. Results show that the method may serve as a reference for operation optimization of similar power units.
  • Research & Analysis
    Reliability Prediction for a Maintainable Standby System
    Du Zhihu, Cui Jianhua
    2014, 28(5): 317-319.
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    A method is proposed for reliability prediction of a maintainable standby system, whose failures can only be found through regular inspection, and ordinary methods are not available due to the discontinuity of maintainable time. Rationality of the reliability prediction method is proved with actual examples.
  • Research & Analysis
    Discussion on Low Vacuum Trip of Condensing Steam Turbines
    Yu Zhongping, Xu Jianqun, Yang Chunxia, Qiao Lin, Situ Yougong, Liu Wei
    2014, 28(5): 320-322.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To provide suggestions for processing vacuum loss of differently-structured steam turbines and ensure safety operation of the turbine units, a triggering event caused by low vacuum of a condensing steam turbine is analyzed in-depth. In combination with structural features, a study is performed on difference of low vacuum trip among several types of steam turbines, after which the trip settings are obtained at different low vacuums. Treatment measures for vacuum loss of different steam turbines are finally proposed considering their actual operation conditions.
  • Research & Analysis
    Analysis on Damage Mechanism of a Gas Turbine High-temperatureComponent and the Countermeasures
    Han Jianqing
    2014, 28(5): 323-327.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    An analysis has been performed on damage mechanism and fault type of a gas turbine high-temperature component, to which corresponding operation and maintenance countermeasures are proposed, including the reasonable examination and repair period, elongated replacement cycle, and the operation, inspection and maintenance technology, etc., so as to minimize the operation and maintenance cost under the premise of ensuring equipment reliability.
  • Research & Analysis
    Engineering Application of Petroleum Coke-fired CFB Boilers
    Dong Jing, Chen Xiaodong, Peng Ruoyu, Yang Lianhai
    2014, 28(5): 328-331.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Considering the trend that petroleum coke might become the main power fuel due to the reduction of coal resources, combustion characteristics of petroleum coke and application achievements of petroleum coke-fired CFB boilers at home and abroad are introduced, focusing on the introduction of construction, commissioning and trial operation of a domestic CFB boiler using petroleum coke (applied in the Indian VC Power Plant). Results show that the petroleum coke can be completely used in a CFB boiler firing low-rank coal after local improvement and operation optimization. Various thermodynamic indexes of the petroleum coke-fired CFB boiler can reach their design values, which therefore is an important direction in the reclamation of petroleum coke.
  • Research & Analysis
    pplication of Tiny-oil Ignition Technology in W-Flame Boiler
    Li Changsong, Yu Pengfeng, Zhang Hui, Xie Guohong, Xu Xianghu
    2014, 28(5): 332-335.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    n introduction is being presented to the principle and composition of tiny-oil ignition system in a certain power plant with W-flame boiler, together with an analysis on coal selection for the ignition system. Meanwhile, various phenomena occurring in operation of the boiler are analyzed, such as failed ignition of the tiny-oil gun, poor combustion, tiny-oil burner coking and overheated wall temperature, etc., to which corresponding countermeasures are proposed. Matters needing attention in the process of system installation, startup and shutdown are listed so as to ensure safe and stable operation of the tiny-ignition system.
  • Research & Analysis
    Off-line Overspeed Test for a GE 9FA Gas Turbine and the Troubleshooting
    Zhang Cai, Su Ye, Shen Jun, Chen Shenghong
    2014, 28(5): 336-340.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    An introduction is being presented to the off-line overspeed test for a 9FA single-shaft combined cycle gas turbine unit, and to specific operation procedures of the test on the Mark Ⅵe control interface, as well as to various problems occurring in the test, like that the turbine speed can not be raised up to the setpoint in trip protection, and how to determine the fuel stroke reference (FSR), etc., to which deep analysis is performed, and subsequently corresponding countermeasures are put forward on the speed control logic of fuel stroke, with a startup curve recorded after the logic optimization
  • Research & Analysis
    Study on Fire-induced Safety Injection Issues in a Nuclear Power Plant
    Ren Zhaoying, Fu Rushi, Huang Jinjing
    2014, 28(5): 341-345.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The influence of fire accident on safety injection system of a nuclear power plant was analyzed according to its design principle and initiation signal, as well as the bypass function of reactor protection system, including real and spurious safety injection (SI) signals initiated by the fire. Upgrading suggestions and corresponding treatment measures were put forward from the aspects of fire zone partitioning, equipment arrangement, fire protection measures, system design and new operation procedures and so on. Analysis results show that these upgrades and treatments can effectively avoid the adverse effect of fire-induced SI on the unit operation, which therefore help to improve the stability and safety of unit operation in case of fire
    • Material & Technology
  • Material & Technology
    Analysis and Improvement on the Jamming in Regulating Mechanism of an NR3 Burner
    Qiang Hongli, Xiang Junping, Shen Guobin, Huang Ying
    2014, 28(5): 346-348.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    An introduction is being presented to the jamming failure occurring in regulating mechanism of an NR3 burner during operation at 350 ℃, to which the causes are analyzed, and subsequently an assembly method is proposed and then verified at 350 ℃ for the NR3 burner. Results show that the jamming problem can be solved fundamentally according to the assembly method, which will result in smooth movement and flexible control of the regulating mechanism, with improved performance of the burner and boiler.
  • Material & Technology
    Penetration Test for Butt Weld of Small PressureVessels in a Nuclear Power Plant
    Wan Qing, Gu Ligang, Liu Nanheng, Li Jiaqi
    2014, 28(5): 349-351.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    An introduction is being presented to a set of penetration test processes for butt weld of small pressure vessels in nuclear power plant, to which detail analysis and elaboration are performed on selection and design of the overall program, main method, test materials and technical process. Actual application proves the proposed penetration test processes to be effective.
    • Operation & Retrofit
  • Operation & Retrofit
    Treatment on Deviation of Wall Temperature and Reheat SteamTemperature in Ultra-supercritical Boiler with Double-section SOFA
    Liu Tao, Xu Lianghong
    2014, 28(5): 352-355.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problems of obvious temperature deviation between the left and right side of water wall and obvious steam temperature deviation between the left and right side of reheater in a ultra-supercritical unit with tangentially-fired boiler, considering the features of the boiler with double-section SOFA, effective commissioning measures are taken, after which temperature deviation problems are solved, with improvement on the operation economy and reliability of the unit.
  • Operation & Retrofit
    Economic Analysis on Steam Source Point Selectionfor Soot Blowing of 630 MW Boiler Units
    Wu Yongke, Chen Zhihua, Zhang Xuan
    2014, 28(5): 356-358.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To reduce the standard coal consumption rate of power supply and the maintenance cost of unit, a method is proposed by changing the steam source of boiler soot blowing through data analysis on various steam sources and on the unit economy after blower parameters are changed, so as to improve unit economy.
  • Operation & Retrofit
    Causes and Countermeasure for Ash Blocking Failurein a Boiler Air Preheater
    Zhang Shuli, Dong Wuming, Yao Shun
    2014, 28(5): 359-363.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To find the causes leading to ash blocking failure in a boiler air preheater, an analysis is performed on the layout and ammonia injection rate of its SCR system, sulfur content in the coal, and soot blowing way of the air preheater, etc., after which the failure is found to be caused by high ammonia escape rate of the denitration system, and subsequently corresponding countermeasures are put forward. Operation practice shows that the ash blocking problem can be solved by adopting the assistant catalyst WO3, controlling the ammonia escape rate of SCR system, the temperature of reactor, and the yield of SO3, optimizing the soot blowing approach of the air preheater, and improving the material quality for low-temperature heating surfaces.
  • Operation & Retrofit
    Analysis on Combustion System Fault of a 9FA Gas Turbine and the Improvement
    Jing Di, Zhuang Qingquan
    2014, 28(5): 364-368.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    An introduction is being presented to the component fault occurring in DLN2.0+ dry low NOx emission combustion system of a 9FA+e gas turbine, together with an analysis performed to the fault causes, from the aspect of fuel gas calorific value, unit operation mode, system design and so on. The abnormal damage of combustion component is found to be caused by huge combustion pulsation resulted from great fluctuation of caloric values due to complicated natural gas sources. To solve this problem, it is proposed to upgrade the combustion system into DLN2.6+, so as to make the gas turbine adapt to caloric value variation of current natural gases.
  • Operation & Retrofit
    Retrofit on Condensate Heater of a 9E Gas Turbine Heat Recovery Steam Generator
    Qin Zuzhi
    2014, 28(5): 369-372.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problems of severe fin corrosion of heating surface tubes especially at boiler tail, high exhaust temperature of boiler and decreased heat exchange efficiency, when heavy oil is fired in the the 9E gas turbine matched with heat recovery steam generator in a power plant, through simulation calculation for the boiler heating surface with thermodynamic calculation software, it is found the condensate heater has a low rate of heat exchange. By changing the structure of relevant finned tubes, and increasing the area of related heating surfaces to increase boiler efficiency, obvious effect has been obtained after the retrofit.
  • Operation & Retrofit
    Analysis on Burnout of a Flame Detector for V94.3A Gas Turbinesand the Improvement Measures
    Li Jiasong, Xie Yajun
    2014, 28(5): 373-375.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    An introduction is being presented to the structure of combustion chamber and flame detector of a V94.3A gas turbine, and to the turbine parameter changes before and after turbine protection activation. Based on analysis, the flame detector failure is found to be caused by breakage of the quartz glass cover, which led to the burnout of flame detection probe and the missing of flame signals. Improvement measures are proposed from aspects of the flame detector structure, protection action logic and the operation management, etc.
  • Operation & Retrofit
    Application of Rotary Air Heaters
    Gu Qiang
    2014, 28(5): 376-381.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problems existing in fixed type air heaters, such as high air resistance, high power consumption of both the forced draft fan and primary air fan, failure of outlet temperature to achieve design requirement, serious vibration existing in the air heater and water drainage system, etc., a solution is proposed by adopting rotary type air heaters. Results show that above problems can be completely solved by substituting the fixed type air heater with rotary type air heater, in which case high reliability of equipment and obvious effect of energy conservation will be obtained.
    • Environmental Technology &Equipment
  • Environmental Technology &Equipment
    Comprehensive Utilization of Solid Wastes from Thermal Power Plant
    Lü Xinfeng, Yan Yi, Jin Ganggang, Guo Runlai, Di Wanfeng
    2014, 28(5): 382-385.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    An introduction is being presented to the origin and property of solid wastes (coal ash and desulfurization gypsum, etc.) generated in thermal power plant, together with an analysis performed on environmental pollution caused by the wastes, and a description made to their domestic comprehensive utilization. Combined with the application practice for comprehensive utilization of solid wastes generated in the thermal power plant of China Resources Power (Hezhou) Co., Ltd., the operation modes “coal-electricity-ash-new wall material/cement” and “coal-electricity-gypsum-plasterboard/cement” are analyzed, through which obvious economic and social benefits are obtained and good application prospects are observed.
  • Environmental Technology &Equipment
    Design and Study of Bypass System for Steam Turbineof Waste Incineration Power Plants
    Li Guangwei
    2014, 28(5): 386-388.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Functions and types of the bypass system for steam turbine of waste incineration power plants are introduced, and from the aspect of unit operation mode, requirements on configuration of the bypass system are analyzed. In combination with the type and capacity configuration of domestic power units in operation, recommendations on how to select a bypass system for the power unit are proposed.
    • New Energy Technology
  • New Energy Technology
    Comparative Analysis on Test Methods for Wind Turbine Characteristics
    Dong Jianfeng
    2014, 28(5): 389-392.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To improve the accuracy and sensitivity of standard test method for characteristic parameters of category I variable speed induction motor of double-fed wind turbines, comparative analysis was carried out to several test methods, so as to raise the turbine efficiency. Results show that compared with the method specified in standard IEEE 112, the series-coupled test method can be applied to better estimate the turbine parameters and predict its steady-state performance.
    • Standard Reseach
  • Standard Reseach
    Implementation of Hardness Requirements Specifiedin DL/T 438 2009 for Boiler Manufacture
    Jing Shiyu, Wang Pengzhan, Guo Yingjun, Liu Xuemei
    2014, 28(5): 393-396.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    From the point of view of boiler manufacture, analysis and discussion were made to problems encountered during implementation of hardness requirements specified in DL/T 438 2009 The Technical Supervision Codes for Metal in Fossil-fuel Power Plant, so as to optimize the codes. It is suggested that some explanatory notes be added to the Appendix C in DL/T 438 2009 to make clear that those hardness values are only for reference, and furthermore, fine adjustments be made to the scope of hardness control for some steels.
    • Power Plant Equipment Management
  • Power Plant Equipment Management
    Analysis on Technical Management and Economy of Boiler Blended Coal Combustion
    Hao Runtian, Zha Wuning, Zhang Xuan
    2014, 28(5): 397-400.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    A feasible blended coal combustion scheme is introduced to provide experience on technical management of boilers at various steps from the incoming coal handling, storage, blending, feeding, effect assessment, optimization & adjustment up to experience spreading, etc. Safe, economic and environmental friendly operation of boilers can still be guaranteed even if various types of low heating value coal and/or high-sulfur coal are blended into the major coal, so that a variety of coal mixtures may serve as suitable coal of the boiler.