Power Equipment

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    Special Contrbution
  • Special Contrbution
    Development Prospect of Power Equipment ManufacturingIndustry in the Coming 10 Years
    ZHENG Jian-fu, TIAN Hui, CHENG Jun-pei
    2012, 26(1): 1-4.
    Abstract ( )   Knowledge map   Save
    To deal with the global financial crisis and promote the economical structure adjustment, the way of developing green and low carbon economy becomes more and more important. By analyzing the present status of domestic power equipment manufacturing industry for green and low carbon power generation, ideas for development of the industry in the coming 10 years are proposed. To meet the development requirement of green and low carbon economy, it is suggested that efforts should be made on the structural adjustment of power equipment manufacturing industry and on the development of new technologies for high-efficiency power generation with new energy resources.
    • Testing & Research
  • Testing & Research
    Characteristic Study on Frictional Pressure Drop of Steam-Water Two-phase Flow in Internally Ribbed Tubes
    YU Meng
    2012, 26(1): 5-8.
    Abstract ( )   Knowledge map   Save
    Under the experimental conditions with pressure in 8~10 MPa, mass velocity in 350~660 kg/(m2·s) and steam quality in 0~1, characteristic studies have been made on frictional pressure drop of steam-water two-phase flow in a hexagonal internally ribbed tube with diameter of 38.1 mm and wall thickness of 7.5 mm, during which the experimental section was horizontally placed. Experimental results show that pressure has a noticeable effect on the frictional pressure drop of steam-water two-phase flow, and the two-phase multiplier reduces with rising pressure, which approaches 1 at critical pressure; as the steam quality increases, the multiplier firstly rises and then reduces; with the growth of mass velocity, the multiplier varies in a decreasing tendency. The B coefficient in the experimental correlation for calculation of the frictional pressure drop has also been discussed.
  • Testing & Research
    Influence of Mixed Burning with Shaped Coal on Comprehensive Economyof Fossil Fuel-fired Power Plants
    SONG Shao-wei
    2012, 26(1): 9-12.
    Abstract ( )   Knowledge map   Save
    Taking the 2×1 025 t/h boilers in a certain power plant as an example, the influence of mixed burning with Juye shaped coal in the boiler has been analyzed against the boiler efficiency, house power and coal consumption, fuel and cost of power generation. Result show that the saved cost because of burning lower heat value shaped coal can compensate the cost increased by high coal consumption, which may therefore bring obvious economic benefit under the condition of large price difference between present shaped coal and raw coal. A reasonable way of coal mixing has been put forward based on the technical features in burning of the shaped coal.
  • Testing & Research
    Study on the Strength of Centrifugal Fan Impeller Basedon One-way Fluid-solid Coupling
    SUN Zhe, WANG Song-ling, WU Zheng-ren, ZHANG Lei
    2012, 26(1): 13-16.
    Abstract ( )   Knowledge map   Save
    Taking into account the effect of centrifugal force, gravity and aerodynamic force against the fan impeller, the aerodynamic force on the impeller surface was obtained through steady state numerical simulation by fan flow field with the software CFX, after which the result was led into the finite element software ANSYS for the strength investigation of the impeller. Calculation results show that the maximum overall deformation would occur in the middle position on the blade suction surface and the maximum equivalent stress would occur in the shroud of the impeller. Under different stable working conditions, the maximum equivalent stress values are different, but there is only little difference.
  • Testing & Research
    Kinetic Model of CO2 Gasification for Coke from Shenmu Bituminous Coal
    GAO Song, WU Liang, HAN Liang, CHEN Jiang-tao, CHEN Hong-wei
    2012, 26(1): 17-19.
    Abstract ( )   Knowledge map   Save
    Kinetic characteristics of CO2 gasification for coke were researched at temperatures from 800 ℃ to 950 ℃ on a fixed bed for the purpose of coal gasification. Calculations were made in accordance with the normal distribution model, which had well reflected the variable law of coke gasification rate along with the conversion rate at different temperatures. Results show that in the beginning of gasification, the gasification rate is the largest, which will then gradually decrease along with the increasing of coke conversion rate. The relationship between the largest kinetic rate and the temperature in the model conforms to the Arrhenius Law, based on which the activation energy of coke CO2 gasification is calculated to be 192.305 4 kJ/mol.
  • Testing & Research
    Analysis of Flow Accelerating Corrosion on Baffle Plate in Low-pressureDrum of a Combined Cycle Unit
    ZHAO Zhi-xiang, XUE Wei
    2012, 26(1): 20-22.
    Abstract ( )   Knowledge map   Save
    In light of the flow accelerating corrosion (FAC) occurring on the baffle plate in the low-pressure drum of a combined cycle unit, causes leading to the FAC have been analyzed, such as the plate material, drum operating temperature, boiler water handling conditions and boiler water flowing status, etc. The possibility of FAC on other components within the drum has also been discussed while methods to inhibit the FAC put forward.
    • Operation & Retrofit
  • Operation & Retrofit
    Retrofit of Integrating Induced Draft Fan with Booster Fanfor a 3 033 t/h Boiler
    LU Huai-tian, ZHONG Shao-wei
    2012, 26(1): 23-25.
    Abstract ( )   Knowledge map   Save
    There were two induced draft fans for the 3 033 t/h boiler and two booster fans in the desulfurizing system in Huaneng Haimen Power Plant, which were all of the adjustable static-blade axial-flow type and had high power consumption in operation. In order to reduce the house power, the induced draft fan and the booster fan were integrated into one and the retrofit on capacity enlargement of the induced draft fan was carried out. After implementation of the said scheme, the house power rate has been reduced by 0.335% in full load operation of the unit, indicating remarkable energy-saving effect.
  • Operation & Retrofit
    Optimization of Air Distribution Mode for a 3 102 t/h Boiler
    ZHANG Zhi-yuan, FENG Zhi-yu, WANG Ding-lei
    2012, 26(1): 26-29.
    Abstract ( )   Knowledge map   Save
    Air distribution mode plays an important role in influencing the stable combustion, safety and economical operation and environmental indicators of a boiler. An analysis has been carried out for adjustment optimization of the air distribution mode, including the secondary air, SOFA and CCOFA. Factors affecting the thermal efficiency and NOx emission have been found and corresponding optimization measures have been carried out, after which good results have been obtained.
  • Operation & Retrofit
    Application of ID Fan Driven by Steam Turbine
    ZENG Bi-qun, YAO You-gong, YANG Bo
    2012, 26(1): 30-33.
    Abstract ( )   Knowledge map   Save
    As the induced draft (ID) fan becomes larger after being integrated with desulphurization booster fan, the increasing motor starting-up current has brought on unreliability to the power system. It is proposed to drive the ID fan by steam turbine so as to reduce the house power consumption rate. Technology and applications of ID fan driven by steam turbine have been studied, of which the economical effects have been compared with that of the motor-driven one. Study results show that the program is feasible.
  • Operation & Retrofit
    Application of WinCC Flexible to Monitoring and Control System of GPRS
    SUN Shao-hua
    2012, 26(1): 34-36.
    Abstract ( )   Knowledge map   Save
    To satisfy the technological and control requirement of gas pressure regulating station (GPRS) in a gas-fired power plant, a configuration design has been conducted with Siemens software WinCC Flexible 2007 for the MP277 touchscreen, the panel display suiting the monitoring requirement of GPRS is thus created, which makes the control more convenient.
  • Operation & Retrofit
    Causes and Countermeasures of Tube Bundle Vibration in Waste Heat Boilerof a Combined Cycle Unit
    YE Xiang-qun, SUN Hao, ZHANG Yan-rong, HE Hai-hua, LIN Zheng-chun
    2012, 26(1): 37-39.
    Abstract ( )   Knowledge map   Save
    The tube bundle vibration problem, often occurring during operation of the waste heat boiler, has been analyzed. Measures have been put forward on the structural arrangement so as to prevent waste heat boiler vibration, such as adopting a rational choice of flue gas flow rate, adding anti-vibration partitions, increasing tube constraints and changing the bundle structure, etc.
  • Operation & Retrofit
    Application of High- and Medium-pressure Shared Feed Water Pumpto Three-pressure Waste Heat Boiler
    JI Rong-sheng
    2012, 26(1): 40-42.
    Abstract ( )   Knowledge map   Save
    n light of selection of the pumps used in the waste heat boiler of gas-steam combined cycle unit, the scheme of high- and medium-pressure shared pump and its applied examples have been described, including the high- and medium-pressure feed water flow rate and the recirculating water flow rate, under different working conditions at different loads, with focus on the control of feed-water flow and pump speed.
  • Operation & Retrofit
    Configuration and Frequent Fault Analysis of ASU in IGCC Power Plants
    ZHANG Jian-fu
    2012, 26(1): 43-46.
    Abstract ( )   Knowledge map   Save
    The air separation unit (ASU) in an integrated gasification combined cycle (IGCC) provides the gasification unit with high-pressure nitrogen, medium-pressure oxygen, instrument air and plant air, which has also relations with the gas turbine in the power plant. As a result, the operation of ASU is very important to stable operation of the IGCC power plant. Features of four kinds of ASU configurations in IGCC power plants have been analyzed and compared, while common malfunctions of ASU and corresponding handling ways summarized.
  • Operation & Retrofit
    Application of AZ20 Oxygen Analyzer to Ultra Supercritical Coal-fired Power Units
    MIAO Shui-bao
    2012, 26(1): 47-49.
    Abstract ( )   Knowledge map   Save
    The significance of monitoring & controlling the oxygen concentration in boiler flue gas and its correction function on adjustment of air supply system are briefly described. The internal structure, measuring principle and routine maintenance of AZ20 oxygen analyzer head and relevant problems occurring in its operation have also been introduced. Operational practice shows that the performance of the analyzer is good, which just requires a little work for maintenance.
    • Product Design
  • Product Design
    Technological Features and Type Selection of 1 000 MW Ultra SupercriticalAir-cooled Steam Turbines
    LIU Qing, XU Qin-fang, ZHANG Xiao-xia
    2012, 26(1): 50-53.
    Abstract ( )   Knowledge map   Save
    The performance of operation and maintenance, the high efficiency and the high reliability of a 1 000 MW ultra supercritical steam turbine manufactured by the Turbine Plant of Shanghai Electric Power Generation Equipment Co., Ltd., and the technical features of the air-cooled unit, have been presented. The type selection of the 1 000 MW air-cooled steam turbine has also been discussed, including the determination of the flowing capacity of its high- and medium-pressure casings and the type selection of its low-pressure casing.
  • Product Design
    Structure Design of Ball Valve with 1.6 m Diameter
    LIN Hong-de, DU Jiang
    2012, 26(1): 54-56.
    Abstract ( )   Knowledge map   Save
    The performance, structure and design features of the ball valve with 1.6 m diameter used in Xiaotiandu Hydropower Station have been introduced. Some new structures were adopted in the design, which made the layout of ball valve more reasonable and the performance more excellent, resulting in improved techno-economic index. The valve is now operating very well.
    • Environmental Technology & Equipment
  • Environmental Technology & Equipment
    Optimization on Main Steam Parameters of Sinter Cooling WasteHeat Power Generation System
    HE Zhang-chen, SONG Ji-yuan, HOU Bin-cai, YANG Hong-yi, FANG Ming, WANG Jing
    2012, 26(1): 57-61.
    Abstract ( )   Knowledge map   Save
    The technologies of sinter cooling waste heat power generation and characteristics of sintering waste heat resources both at home and abroad are summarized, based on which a thermodynamic model of the sinter cooling waste heat power generation system is set up. The relationship between the main steam parameters and the maximum power generation capacity is analyzed, including main factors affecting the system power generation, after which optimum main steam parameters are obtained.
    • Conputer and Control
  • Conputer and Control
    Soft Measuring Technology and its Application to Thermal Power Plants
    LI Xiao-xue, XIAO Bo-le
    2012, 26(1): 62-66.
    Abstract ( )   Knowledge map   Save
    Many important parameters which will influence the operation safety and economy of thermal power plant can’t be measured on-time. But soft measuring technology can be used to substitute software for hardware (sensor) through the mathematical relationship set between primary variables hard to be measured and auxiliary variables easy to be measured. The basic way of the soft measuring technology are being introduced, while a general theory of soft measuring model and the way of model setting put forward. Moreover, an introduction is presented to the application of the soft measuring technology to the thermal control in a fossil-fired power plant with examples.
  • Conputer and Control
    Summary of the Monitoring and Fault Diagnosis Systemsfor Turbine-Generator Vibration
    YANG Chang-zhu
    2012, 26(1): 67-69.
    Abstract ( )   Knowledge map   Save
    The function, composition and implementation of some turbine-generator vibration monitoring and fault diagnosis systems (TDM system) have been introduced and the advantages and disadvantages of different TDM systems have simply been evaluated. Field application shows that the vibration monitoring function of TDM system may help to reduce the times of unit shutdown, and accordingly increase the unit efficiency and lower the power generation cost.
    • Power Plant Management
  • Power Plant Management
    Analysis of Overhaul Stragety for Power Equipment
    JIANG Sheng
    2012, 26(1): 70-71.
    Abstract ( )   Knowledge map   Save
    Evolution and development of power generation overhaul systems have been described and the main domestic overhaul tactics currently used have been contrastingly analyzed, based on which an optimized overhaul strategy is put forward by combining the fusion fault overhaul, regular overhaul and status overhaul into an integral one so as to provide effective means of improving the reliability of equipment, reducing overhaul cost and improving the management level of power equipment overhaul.