Power Equipment

Archive

  • Select all
    |
    Testing & Research
  • Testing & Research
    Research on Stiffness of Foundation and Bearing Pedestal for 600 MW Supercritical Air-cooling Unit
    SUN Qing, LI Wang-fan, WANG Xiu-jin
    2012, 26(4): 217-221.
    Abstract ( )   Knowledge map   Save
    The finite element analysis method and test method of stiffness of the foundation and bearing pedestal for 600 MW supercritical air-cooling unit are introduced. The static stiffness calculated results of a three cylinder tandem compound four exhaust 600 MW supercritical air-cooling unit’s foundation and bearing pedestal based on finite element method are presented, and dynamic stiffness of the same level supercritical unit’s foundation and bearing pedestal in the field test are obtained. Based on the support stiffness of bearing offered by the factory and the data obtained by the field test, the comparative calculation of critical speed of the shaft system comes out. By researching the stiffness characteristics of foundation and bearing pedestal for this type set in many aspects, the results could be used as a guide on the design of the dynamic characteristics of the shaft system with the similar type or the same level set.
  • Testing & Research
    The Aerodynamic and Structural Design of Low Noise Wind Tunnel
    ZHU You-jun , OUYANG Hua , DU Zhao-hui
    2012, 26(4): 222-225.
    Abstract ( )   Knowledge map   Save
    In order to investigate turbomachinery aerodynamic noise and its mechanism, a low noise wind tunnel has been designed and implemented. In the design process, detailed aerodynamic calculation of the main components is given, as well as the design basis. After the completion of the wind tunnel, flow field and aeroacoustic characterization of the facility are measured. The results show that maximum wind speed in the test section is 81 m/s and wind tunnel flow quality can achieve the design requirements with low turbulence and low background noise.
  • Testing & Research
    Research of Steam Turbine Thermal Performance Test Method of Gas Turbine Unit Expanded to Combined Cycle
    LIU Xiang-min
    2012, 26(4): 226-229.
    Abstract ( )   Knowledge map   Save
    Steam turbine performance test of a gas turbine unit expanded to combined cycle is introduced.Test program, calculation method, correction method and test uncertainty calculation method are given. The test is analyzed and recommendation for optimizing the plan is presented. It is obtained though the test that the total uncertainty of heat rate is ±0.420 and the total uncertainty of generation output is ± 0.355%. It is showed that the test program can ensure accurate and valid results.
  • Testing & Research
    Modal Analysis of the Rotor’s Bending Vibration for the Blast Furnace Top Gas Pressure Recovery Turbine
    WANG Xiu-jin, LI Wang-fan，WANG Wei-guo
    2012, 26(4): 230-233.
    Abstract ( )   Knowledge map   Save
    The modal tests of turbine rotor for the blast furnace top gas pressure recovery turbine unit (TRT) are accomplished with rotor supported on the bracket and the elastic rope suspended state respectively. The effect of different constraints on rotor modal is analyzed. Based on the finite element model of the turbine rotor in a free state, the modes are given by the modal analysis of the TRT rotor, then the calculation values and the measured values of the main natural bending vibration frequency are compared. The results show that the turbine rotor supported on the bracket may exist modes between the horizontal and vertical orientations, whereas turbine rotor suspended on flexible steel wire rope can be approximately taken as free state. Simultaneously, the finite element analysis results and the measured values of turbine rotors natural frequency agree well especially in lower order frequencies. This may serve as a reference for future turbine rotor’s modal analysis.
  • Testing & Research
    Influence of Structure and Parameters of Swirling Burners on NO.x Emission
    HUANG Jun-jia, CAI Shi-lin, CAO Han-ding
    2012, 26(4): 234-238.
    Abstract ( )   Knowledge map   Save
    By numerical simulation on a boiler with swirl burners, the effects of following factors on mass concentration of NOx emission have been analyzed, such as the radial velocity at outlet of secondary air, the bias mode, the dense dilute ratio and the external secondary air ratio, etc. The original bluff body has been modified, during which reasonable shape and position of bluff body with better bias effect is obtained. By combining the calculated optimal parameters and the retrofitted burner structure, an optimal parameter combination is obtained, in which case the lowest mass concentration of NOx emission can be reached.
  • Testing & Research
    ANSYS Stress Analysis and Evaluation of a Pressure Monitoring Device for Electrical Penetration Assemblies in Nuclear Power Plants
    WANG Jing-xi , Wang Wei , MA Xin-min
    2012, 26(4): 239-245.
    Abstract ( )   Knowledge map   Save
    A pressure monitoring device for electrical penetration assemblies (EPA) in nuclear power plant has been introduced. General stress analysis and evaluation to the device have been made by ANSYS finite element analysis in accordance with RCC-M. Analysis results indicate that the pressure monitoring device can meet relevant strength requirements of RCC-M, which can safely and reliably operate in the life time of nuclear power plants.
  • Testing & Research
    Steam Temperature Control during RB Process of Feed Water Pump for Ultra-supercritical Units
    ZHANG Shu-li
    2012, 26(4): 246-247.
    Abstract ( )   Knowledge map   Save
    The steam temperature control strategies for feed water pump RB process in ultra-supercritical units have been studied. The influence of ratio of fuel to water, excessive air coefficient and enthalpy control on steam temperature has been theoretically analyzed. Taking the 1 000 MW unit as an example, the setting points of fuel supply, water supply and airflow that impact the steam temperature have been logically discussed, while control strategies for feed water pump RB process put forward. Tests have been done to verify the effectiveness of the control strategies.
  • Testing & Research
    Analysis on the Energy-saving of the Liquid-ring Type Vacuum Pump for the Condenser in a Gas Turbine Power Plant
    WANG Shao-feng
    2012, 26(4): 248-251.
    Abstract ( )   Knowledge map   Save
    In view of the economy of the condenser liquid-ring type vacuum system, analysis on both the energy-saving principle of frequency conversion controlling and the effect of the revolution against the vacuum pump efficiency the has been carried out and the conclusion which the energy-saving result is not obvious has been obtained by the frequency conversion improvement of the condenser vacuum system. The way of direct stopping operation of the vacuum pump without breaking vacuum will be adopted while the combined cycle unit with two-shift operations stops. The vacuum pump will be put into operation when the combined cycle unit starts up again so as to achieve effective conservation of energy.
  • Testing & Research
    Performance Test and Operation Characteristics of ZGM113G-II Type Medium Speed Coal Mills
    REN Ming-wei , CHENG Zhi-hai , HE Xiang , ZHOU Wen-tai
    2012, 26(4): 252-255.
    Abstract ( )   Knowledge map   Save
    By performance tests and corresponding analysis to the ZGM113G-II type mill, causes leading to irrational operation of the pulverizing system have been found out, to which an adjustment way is put forward. Study results show that the fineness R 90 of pulverized coal is within 4%~13% under various test conditions, and the uniform index n is within 0.66~1.17; the air flow rate at air ring area is below 85 m/s under most test conditions; the maximum coal feed rate is 75 t/h, with a corresponding mill power consumption of 6.123 kW·h/t; from the point of view of coking relieving, the deflector baffle opening should be set at 60/60; the coal feed rate would better be set within 65~70 t/h, while the primary air pressure be controlled within 10~12 kPa and the hydraulic loading pressure be controlled within 7.5~9.5 kPa.
  • Testing & Research
    Influence of Combustion Air Distribution on Boiler Furnace Slagging and NOx Emission
    ZOU Xian-hong , LU Chun-yi , CHEN Guang-yuan
    2012, 26(4): 256-259.
    Abstract ( )   Knowledge map   Save
    By air distribution tests, the influence of air distribution on boiler slagging and NOx emission of a 300 MW power unit has been studied. Test results indicate that appropriate air supply rate and smaller secondary air damper opening would help to reduce not only furnace slagging, but also NOx emission.
    • Computer & Control
  • Computer & Control
    Simulation on Noise Cancellation for Condenser Vacuum Signals based on ICA
    YAN Zhe, WANG Ming-chun, CHEN Xian-xian
    2012, 26(4): 260-262.
    Abstract ( )   Knowledge map   Save
    In view of the matter of noise cancellation of condenser vacuum signals, ICA (Independent Composition Analysis) is used in accordance with the detected conditions and the characteristics of detected objects, virtual noise channel is introduced and the de-noising model for condenser vacuum signals is established. From the practice of de-noising simulation, it can identify that the ICA model is efficient for de-noising which is of great value to de-noising against condenser vacuum signal.
  • Computer & Control
    Application of Image Fusion in Electrical Capacitance Tomography
    ZHOU Xiao-ning
    2012, 26(4): 263-267.
    Abstract ( )   Knowledge map   Save
    Regarding image reconstruction, an introduction is being presented to the configuration and fundamentals of electrical capacitance tomography, and the fusion method and rules of multi-resolution image. Image fusion has been made with simulation results from pre-processing projection Landweber algorithm and improved Tikhonov regularization algorithm. Results show that with image fusion technology, high resolution imaging can be obtained, indicating by high similarity of imaging to prototype after removal of redundant information, which therefore can be applied to real-time on-site image reconstruction of two-phase flow.
  • Computer & Control
    Design and Implementation of an ASP.NET-based Power Plant Maintenance Project Management System
    LI Xiao-min
    2012, 26(4): 268-270.
    Abstract ( )   Knowledge map   Save
    Regarding the requirements on maintenance management of power plants, a B/S configuration based on ASP.NET and SQL Server 2000 technology has been developed to realize computerization maintenance management, by using both the engineering project management and software engineering management method. In addition, the data base and implementation of the management system have been described.
  • Computer & Control
    Study on the Intelligent Coal Yard Management System for Thermal Power Plants
    WU Xue-qing , YANG Tao
    2012, 26(4): 271-274.
    Abstract ( )   Knowledge map   Save
    An introduction is being presented to the concept of intelligent coal yard, together with a discussion on general functional requirements of the intelligent coal yard management system, and a description to specific structure, individual module functions and application status of a newly developed management system. Application of the system may help to realize intelligent management on coal yard and blended coal combustion according to actual requirement of boiler, so as to achieve optimized fuel control for power plants. Moreover, it points out that the system needs to be further improved.
    • Product Design
  • Product Design
    Design of Gas Filter for Heavy Duty Gas Turbine
    AI Song , TAO Jian， DAI Fu-lin
    2012, 26(4): 275-277.
    Abstract ( )   Knowledge map   Save
    In view of the design of high temperature gas filter used in heavy duty gas turbine, the basic requirements of the gas turbine against the gas terminal filter have been introduced. The performance norms, the structure, the calculation of pressure drop and the compensating measures when the filter element elongates once the gas temperature rises have also been described with living examples.
  • Product Design
    Power System for Control Rod Drive Mechanism of Nuclear Power Plants
    YU Gao-wei , ZHOU Yun-hua , SHEN Zhi-hua , ZHANG Jun , ZHANG Yong
    2012, 26(4): 278-281.
    Abstract ( )   Knowledge map   Save
    Functions and effects of the power system for control rod drive mechanism of nuclear power plants have been introduced, while characteristics of relevant domestic power systems analyzed, with focus on the special logic processing applied during start-up of the unit or during juxtaposition of two units, with which quick juxtaposition of two units and uniform distribution of reactive power can be achieved under no-load conditions.
  • Product Design
    Advantages of Large Variable-frequency Speed Regulation Electric Generator (Motor)
    WANG Li-na
    2012, 26(4): 282-284.
    Abstract ( )   Knowledge map   Save
    Regarding the variable-frequency speed regulation electric generator applicable for wind power plant and pumped storage power station, basic principles, structural characteristics and advantages of the non-salient pole AC synchronous generator have been introduced. The rotating speed can be altered by adjusting the frequency, amplitude and phase of the three-phase AC excitation current. Via vector control, the active and reactive power can be adjusted quickly according to actual variation of network power load.
    • Operation & Retrofit
  • Operation & Retrofit
    Analysis and Retrofit on Superheater Underheating and Reheater Overheating of a 1 175 t/h Boiler
    WEN Wu-bin , LIU Jin, LIU Ping-yuan, DING Shi-fa
    2012, 26(4): 285-287.
    Abstract ( )   Knowledge map   Save
    To solve the problems existing in a 1 175 t/h boiler, such as high residual rotation of the flue gas at furnace outlet and high deviation of the gas flow, gas temperature and steam temperature during upward swinging of the burner, caused by underheating of the superheater due to insufficient heating surfaces, which have led to overheating of the reheater and increased water consumption for subsequent attempering purpose, specific retrofit measures have been proposed, such as lengthening the platen superheater downward by 1 m and adding a coil of vertical tube to the low-temperature superheater, etc. Above problems have finally been solved after implementation of the retrofit measures.
  • Operation & Retrofit
    An Explosion-proof Analysis of Intermediate Coal Pulverizing Systems
    DI Wan-feng , LIU Jian, DENG Hai-tao , LIU Guang-wu
    2012, 26(4): 288-291.
    Abstract ( )   Knowledge map   Save
    The constitution of a negative pressure intermediate coal pulverizing system is being presented. From aspects of both the equipment and coal quality, causes leading to explosion of the coal pulverizing system are analyzed, for which practical countermeasures are put forward, so as to guarantee a safety operation of the pulverizing system.
  • Operation & Retrofit
    Prevention of Formation and Peeling-off of Oxide Scales on Heating Surface of 1 036 MW Boilers
    ZENG Bi-qun, CHEN Yu-zhong, FENG Ting-you
    2012, 26(4): 292-298.
    Abstract ( )   Knowledge map   Save
    To reduce the formation and peeling-off of oxide scales on high-temperature heating surface of boiler, and the sediment of oxide scales in pipeline and flow path of turbine, a study has been carried out on the oxidizing treatment of feedwater, oxidation control of heating surface, peeling-off prevention of oxide scales and control optimization of feedwater oxygenation, after which countermeasures and noteworthy items are put forward for control of the oxide scales in 1 036 MW units. Application results prove above measures to be effective in controlling the generation, peeling-off and sediment of oxide scales on heating surface of boiler, which would ensure safety and reliable running of the units.
  • Operation & Retrofit
    Practice of Condensate Pump used in Large-capacity Units with Frequency Conversion Technology
    XIE Cheng, WU Zhi-qiang, LI Guo-ming, YANG Xiao-wei
    2012, 26(4): 299-302.
    Abstract ( )   Knowledge map   Save
    In view of the problem of the condensate pump playing no more role in the operation after improvement owing to restraint of the sealed water pressure of the pump, the improvement of sealed water system and its shaft seal form has been put forward so as fully to play the potential energy-saving role of the frequency conversion of condensate pump and to improve the water level control of the deaerator. The practice shows that the energy-saving rate of the frequency conversion pump is increased from 38.43% into 61.21%.
  • Operation & Retrofit
    Analysis on the Operational Mode of Sealed Oil System for 1 036 MW Turbo-generator
    GU Wei, CHEN Fan-fu, SUN Wei-peng, FENG Ting-you
    2012, 26(4): 303-305.
    Abstract ( )   Knowledge map   Save
    The sealed oil system of uniflow ring type for the turbo-generator in 1 036 MW ultra-supercritical power unit has been introduced. The key points of the sealed oil system have also be described under the modes of normal operation, trouble operation, emergent operation and enclosed circulating operation so as to ensure its safe operation of the sealed oil system.
  • Operation & Retrofit
    Retrofit on the External Heatchanger of a 1 025 t/h CFB Boiler
    NIU Shu-yun
    2012, 26(4): 306-308.
    Abstract ( )   Knowledge map   Save
    Regarding wearing and tube rupture issues of the external medium-temperature superheater II for the 1 025 t/h CFB boiler of a power plant, causes leading to above problems are analyzed, such as the deficiency in structure and the rub-impact faults due to vibration. For anti-wear and anti-vibration purposes, corresponding countermeasures are put forward, which are proved to be effective in solving above problems.