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    Testing & Research
  • Testing & Research
    On-line Simulation and Calculation on High-pressure Rotor Temperature of a 1 000 MW Steam Turbine
    LIU Yan, YANG Yu, CHEN Gang
    2012, 26(5): 309-312.
    Abstract ( )   Knowledge map   Save
    For a 1 000 MW ultra supercritical steam turbine, the finite element method is used to verify the correctness of the internal surface temperature of inner cylinder instead of the outer surface temperature of rotor in the thermal stress monitoring and control. Using Inertial element method, difference method, finite element method, the volume average temperature of the high pressure rotor and the temperature of the rotor center are calculated in cold start, warm start, hot start and very hot start process, and the accuracy analysis of calculation of the temperature difference is completed. The accuracy and popularization of inertial element method is verified, the technical routes for application in other types of large capacity steam turbine rotor thermal stress monitoring and control are given.
  • Testing & Research
    Temperature and Pressure Compensation in Steam Flow Measurement
    LI Jian-sheng,WANG Bin
    2012, 26(5): 313-316.
    Abstract ( )   Knowledge map   Save
    An introduction is being presented to the basic principles of steam flow measurement using orifice plate, as well as the necessity of steam temperature and pressure compensation in the measurement. Various compensation calculation methods for superheated steam flow measurement, commonly used in industrial turbine unit, are proposed, of which their influences on flow measurement errors are evaluated with actual examples. One of the methods may be chosen for calculation of temperature and pressure compensation according to specific precision requirements and software module function of the system in actual steam flow measurements.
  • Testing & Research
    Protection and Monitoring Technology of Annular Combustor for F Class Gas Turbines
    YANG Jiong
    2012, 26(5): 317-319.
    Abstract ( )   Knowledge map   Save
    By analyzing the structural features of annular combustor for F class gas turbines, the protection & monitoring principle and the items necessitated to be protected and monitored for the combustor has been introduced, based on which the realization way is put forward. This may serve as a reference for development of domestic high-performance gas turbines.
  • Testing & Research
    Calculation of Cleanness Factor for Sootblowing Optimization of Air Preheaters
    ZHANG Xiao-an, LI Yong-hua
    2012, 26(5): 320-322.
    Abstract ( )   Knowledge map   Save
    Regarding the sootblowing optimization for air preheaters, a method has been proposed to determine the start time of sootblowing based on calculated cleanness factors. Specific calculation way of cleanness factor has been deduced, while relationship between the cleanness factor and actual heating surface contamination analyzed. An optimized sootblowing system has been developed, by monitoring the variation of cleanness factor, so as to determine when to start or stop the sootblowing operation.
  • Testing & Research
    Configuration and Features of Main Auxiliaries in Conventional Island of 1 000 MW Nuclear Power Units
    ZHOU Yi-gong, REN Yi-feng, CHEN Jian-sheng
    2012, 26(5): 323-327.
    Abstract ( )   Knowledge map   Save
    Configuration of main auxiliaries in conventional island of domestic 1 000 MW nuclear power units has been introduced. Rationality and features of the configuration have been analyzed from aspects of safety, advancement and economy, which could serve as a reference for selection and configuration of nuclear power plant equipment.
  • Testing & Research
    The Function of Orifice in Turbine Governing & Protecting System and its Fault Analysis
    MA Yong, ZHU Li-tong, FU Chang, WU Tao
    2012, 26(5): 328-330.
    Abstract ( )   Knowledge map   Save
    Taking the governing & protecting system of a domestic 135 MW turbine as an example, the functions of control orifice, safety orifice and experiment orifice in the system are described. Some common faults in the turbine governing & protecting system caused by orifice are introduced, including the low EH oil pressure, sudden shut off of HP governing valve in normal operation, abnormal latching of turbine unit, sudden shut off of the valve during testing period and frequent switching of feed pump turbines governing valve. So, great attention shall be paid to the correctness of the orifice installation & commissioning.
  • Testing & Research
    Cold-end Design Optimization of the 1 000 MW Ultra Supercritical Turbine Unit
    JIN Hong-wei, ZHANG Jun-ren
    2012, 26(5): 331-333.
    Abstract ( )   Knowledge map   Save
    A study has been carried out to analyze the effects of steam turbine cold-end parameters on the thermal efficiency and operation economy of the power plants thermodynamic system. Combined with the practical project, the cold-end design optimization for 2×1 000 MW ultra supercritical steam turbines has been described. The ways of reducing condenser pressure, temperature difference and terminal difference have been analyzed based on relevant principles. The design optimization and resulting effects for the condenser pressure and circulating water pumps configuration have been introduced with examples.
    • Computer & Control
  • Computer & Control
    The AGC Optimizations and Experiments
    GUO Bo-chun,XIAO Sheng
    2012, 26(5): 334-338.
    Abstract ( )   Knowledge map   Save
    Taking the AGC of a 600MW unit in Guangan Power Plant as an example, the AGC index and AGC block diagram being operated in the thermal power unit have been described. In view of the problems exposed after AGC being put into operation, four aspects like the operation rate, regulation capacity, response speed, regulation accuracy have been perfected. Experimental results prove that the optimized AGC system can meet the requirements of performance regulation.
  • Computer & Control
    Optimization of the Distributed Control System in Thermal Power Plants
    CAO Li-jun
    2012, 26(5): 339-342.
    Abstract ( )   Knowledge map   Save
    In view of the great effect of the performance of distributed control system against the operational reliability of the power unit and combined with the 2 projects in India, the deficiency of the function, configuration and operation of PKS R210 DCS system has been described. The upgrading of the controller and the optimization of the software have been carried out in the following project and the control system has been renewed to Honeywell R310. The practice shows that the measures adopted have improved the security, reliability and efficiency of the system.
  • Computer & Control
    The Practice of Communication Functions of MACS V Distributed Control System
    KANG Kang, HU Yi-qun
    2012, 26(5): 343-345.
    Abstract ( )   Knowledge map   Save
    The communication functions of MACS V control system has been described combined with the practice of distributed control system in 4×600 MW units in Guohua Jinjie Energy Co., Ltd.. And a systematic communication method between the distributed control system and the third party has been provided based on Modbus agreement and OPC standard.
  • Computer & Control
    Application of Fieldbus Technology to the Assistant Control System of 660 MW Thermal Power Units
    MA Zhi-yong
    2012, 26(5): 346-348.
    Abstract ( )   Knowledge map   Save
    The application of FCS 165 control system, which is based on Profibus-PA and Profibus-DP fieldbus technologies and used in the assistant control system for a domestic 660 MW supercritical power unit, has been introduced. The fieldbus device management software, which has possessed functions of fault diagnosis and maintenance management, will make the maintenance simpler and easier and also greatly reduce the costs of operation & maintenance. At the same time, the problems occurring in application have been analyzed briefly and the countermeasures for future application have been put forward.
  • Computer & Control
    Development of a Fault-diagnosis Expert System Based on Alarm Triggering
    QIAN Hong, XIN Hao, YAO Yi-ming, ZHU Guo-wei
    2012, 26(5): 349-352.
    Abstract ( )   Knowledge map   Save
    In view of existing periodic triggering diagnosis as the fault-shooting expert system in power plant, a fault-located self-diagnosis expert system based on the alarm triggering has been put forward. Based on different types of faults and their symptoms obtained from analysis on faults mechanism, a reasonable diagnosis pattern has been established by analytic hierarchy process. Finally a whole system has been composed by different modules of software. The expert system may serve as a reference for on-line fault-diagnosis of power plants.
  • Computer & Control
    The Scheme of On-line Self-optimizing Control for Boiler Air-Fuel Ratios
    MA Li-ge, WANG Xin-wei
    2012, 26(5): 353-354.
    Abstract ( )   Knowledge map   Save
    By using the optimal control theory and the scheme of stepping search for the self-optimizing control, an optimal air-fuel ratio is determined through relation curves between thermal efficiency and air coefficient of boiler under various operating conditions at different loads, so as to achieve a complete burning of fuel and optimal thermal efficiency of boiler.
    • Maerial & Technology
  • Maerial & Technology
    R&D Progress of 700 ℃ Power Generation Technology and Alloy 617 in Europe
    YANG Hua-chun, LIN Fu-sheng, XIE Xi-shan, LAI Xian-hong, YANG Wen, YANG Xiao-chuan
    2012, 26(5): 355-359.
    Abstract ( )   Knowledge map   Save
    R&D activities and current status of 700 ℃ power generation technologies as well as the research progress of alloy 617 for high-temperature boiler components, since commencement of the European AD700 project, have been introduced, which may serve as a reference for R&D of domestic 700 ℃ power generation technologies.
  • Maerial & Technology
    Study on Notch Sensitivity of TP310HCbN Steel after Aging Treatment
    LI Bao-hu, JIN Yong-qiang, MAO Jie
    2012, 26(5): 360-361.
    Abstract ( )   Knowledge map   Save
    A series of tests were carried out to study the notch sensitivity of TP310HCbN steel after aging treatment. Comparison results show that the notch sensitivity of TP310HCbN steel is relatively small after long-term high-temperature operation, but its plasticity reduces obviously after aging tests.
  • Maerial & Technology
    Technological Improvement on Stress Adjustment of Thrust Bearing in a Hydroelectric Power Unit
    DONG Lai-sheng, LI Jun
    2012, 26(5): 362-364.
    Abstract ( )   Knowledge map   Save
    The structure of the thrust bearing and its installation technology have been introduced for a Three Gorges ALSTOM unit. Some problems existing in the traditional stress adjustment of the thrust bearing have been illustrated. An improved technology, which was successfully implemented to the stress adjustment of the thrust bearing in the 5F unit of the plant, has been put forward. The result shows that the new technology has improved the work efficiency, adjustment quality, and the stress uniformity of the thrust bearing as well.
    • Operation & Retroft
  • Operation & Retroft
    Cause Analysis and Treatment on Tail Duct Vibration of a 1 900 t/h Boiler
    LOU Jie, JIANG Jian-wei, LIAO Xiao-chun
    2012, 26(5): 365-368.
    Abstract ( )   Knowledge map   Save
    Aiming at the tail duct vibration problem occurring in the boiler for a DG1900/25.4-II2 super critical unit, a series of experiments, analyses and calculations have been carried out, after which the vibration is found to be mainly caused by high-frequency resonance resulted from very closeness of the Karman vortex shedding frequency to the acoustic wave frequency of the equipment. The vibration could be eliminated by installing an anti-vibration baffle plate.
  • Operation & Retroft
    Hot Air Supply for Coal Mills in Boiler with Oil-free Ignition Burners
    XING Xi-dong
    2012, 26(5): 369-371.
    Abstract ( )   Knowledge map   Save
    Regarding the hot air supply for coal mills during plasma oil-free ignition of the boiler in large thermal power units, it is pointed out that the hot air can be obtained directly from the hot primary air system of neighboring boiler or by making the high temperature steam from neighboring boiler go through a fan heater. Following two arrangements of air heater are analyzed: one is directly arranged in hot air duct, another is in the bypass of hot air duct. The latter arrangement is more practical due to its minor resistance to the system.
  • Operation & Retroft
    Analysis on the Thrust Pad Wear of Main Oil Pump in Positive Differential Expansion Mode
    ZHANG Quan, YUE Guo-hua,MENG Zai-lang, LI Jian
    2012, 26(5): 372-374.
    Abstract ( )   Knowledge map   Save
    In view of the thrust pad wear of main oil pump only in the negative differential expansion mode, an analysis on the thrust pad wear of main oil pump has been carried out in the positive differential expansion mode. Combined with the coupling structure of main oil pump, the cause of the thrust pad wear has been found in the positive differential expansion mode based on the analysis of axial motion of main oil pump. The results of analysis tally with the practical data from living example. Some suggestions to avoid thrust pad wear have been put forward simultaneously.
  • Operation & Retroft
    Analysis on the Reasons of Turbine Oil Deterioration and Its Precautions
    YU Zhu-zhong
    2012, 26(5): 375-377.
    Abstract ( )   Knowledge map   Save
    In view of the problem of turbine oil deterioration, combined with many cases of turbine oil failure and also the introduction of turbine oil function & quality index, the reasons of turbine oil deterioration have been analyzed throughout the whole process of the turbine oil system, including the design, manufacture, construction, installation and service of the system, after which corresponding precautions are put forward, so as to provide an important basis for the management of turbine oil.
    • Environmental Technology & Equipment
  • Environmental Technology & Equipment
    Influence of Fuel Property on Design and Operation of Biomass CFB Boilers
    XIAO Hui-ping, XU Di-ping
    2012, 26(5): 378-381.
    Abstract ( )   Knowledge map   Save
    The influence of fuel property on design and operation of biomass CFB boilers has been analyzed on the aspects of ash content, chemical composition, moisture content and particle size of the biomass fuel, after which some suggestions are put forward for the boiler design from the point of view of controllable fuel properties.
    • Power Plant Mangement
  • Power Plant Mangement
    Key Control Points of the Circulating Cooling-water System in a Thermal Power Plant
    LIN Gang, WANG De-yuan
    2012, 26(5): 382-384.
    Abstract ( )   Knowledge map   Save
    For an overseas power plant EPC project, the important role and new situation of its circulating cooling-water system have been described. Combined with actual engineering projects, technical control points have been put forward from three aspects like engineering, procurement and construction for the circulating cooling-water system.
  • Power Plant Mangement
    Enhance the technology management of thermal power equipment manufacturing enterprises by PDM System
    LIU Jie
    2012, 26(5): 385-388.
    Abstract ( )   Knowledge map   Save
    Focus on enhancing the design efficiency of thermal power equipment manufacturing enterprises, strengthen product management,apply PDM system as a platform to establish project management as the core, to be based on the process management, to product development process management as the goal of the project management model,to build collaborative design and development process management platform, product management process control technical information,to achieve effective documentation,and ultimately enhance the level of thermal power equipment manufactuuring enterprise’s technology management.