Power Equipment

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  • 2022 Volume 36 Issue 3
    Published: 15 May 2022
      
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  • Influence of Plastic Melting on the Heat Transfer Process of Typical Components of Municipal Solid Waste
    Chang Qinghang, Ma Xiaobo, Han Feiyang, Wang Meng, Yin Lijie, Chen Dezhen
    2022, 36(3): 149-154. https://doi.org/10.19806/j.cnki,fbsb.2022.03.001
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Based on Euler-Lagrangian model, researches were conducted on the influence of plastic melting on the heat transfer process of three types of typical components of municipal solid waste, including biomass, fabrics, and paper. Results show that, the heating rate of plastic before melting is lower than that of the other three types, and there is an increase in the heating rate of plastic after melting. With the increase of the plastic content, the effective heat transfer coefficient of plastic before melting decreases, while that of plastic after melting increases. For the smaller size of material particle, the heat transfer effect can be improved by a higher effective heat transfer coefficient.
  • Calculation Optimization on the Circulating Water System with Main Steam Turbine and Steam Turbine of Feed Water Pump Setting the Condenser Respectively
    Cai Xingchu, Liang Tao, Tang Xiaofeng, Chen Bin
    2022, 36(3): 155-158,163. https://doi.org/10.19806/j.cnki,fbsb.2022.03.002
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The scheme of the main steam turbine and the steam turbine of feed water pump setting the condenser respectively is used in some large thermal power units, while the existing calculation program of the circulating water system is not suitable for the scheme. A calculation optimization method with following parts was proposed to solve this problem, such as optimizing the cold end equipment of the main steam turbine individually, setting a virtual condenser, matching the water temperatures of the cooling tower of the main steam turbine and the common cooling tower, etc. Calculation results show that an economical configuration of the circulating water system could be obtained with this method.
  • Research on Action Mode of Connecting Pipe Butterfly Valve under Load Dumping of Heating Units
    Liu Wangkou, Jiang Jun, Fan Xuefei, Yin Yulan
    2022, 36(3): 159-163. https://doi.org/10.19806/j.cnki,fbsb.2022.03.003
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    By studying the relationship between rotational speed of steam turbine and butterfly valve action of connecting pipe under load shedding of heating units, a new calculation method of valve action on rotational speed of steam turbine based on time step method is proposed. A typical 300 MW supercritical heating unit was used as an example for calculation and analysis, and the speed-up curves of the connecting pipe butterfly valve under three opening modes and the steam pressure curves of the connecting pipe butterfly valve under full opening or full closing were obtained, and the calculation results are of great reference significance for the setting of the heating butterfly valve action under load shedding in similar heating units.
  • Study on Energy Saving Effect of Secondary Recovery of Exhaust Flue Gas Heat in a Coal-fired Power Plant
    Jin Jun, Guan Jian, Lin Zhiming, Xu Wei, Shen Zhongming, Fu Guotao, Chen Jinhong, Wu Xuecheng
    2022, 36(3): 164-169. https://doi.org/10.19806/j.cnki,fbsb.2022.03.004
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking a 660 MW unit in a coal-fired power plant as the research object, for the existing primary exhaust flue gas heat recovery system, a study was conducted on the energy saving effect and economy with adding the secondary exhaust flue gas heat recovery equipment. Calculation results show that, through adopting the retrofit of the secondary exhaust flue gas heat recovery, the net coal consumption rate can be reduced by 0.206 g/(kW·h). The retrofit of the secondary exhaust flue gas heat recovery is a good technology with implementability, but the total equipment investment is high and the payback period of this retrofit is about nine years.
  • Discussion on High and Low Grade Heat Source Utilization in a 700 MW Power Plant
    Jiang Jianping, Peng Xinke, Zhang Jian, Yu Qun
    2022, 36(3): 170-173. https://doi.org/10.19806/j.cnki,fbsb.2022.03.005
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking a regional cooling and heating project as an example, following three schemes with using the heat source from a 700 MW power plant for energy supply were analyzed and compared, such as using the waste heat of the low grade circulating water, using the high grade steam, and using the both of the high and the low grade source. Results show that, when using the waste heat of the low grade circulating water for energy supply, the optimal economy can be obtained. This may serve as a reference for the realization of the stepped utilization of energy in power plants.
  • Analysis on the Influence of Whole Life Cycle of Power-to-gas with Wind Energy on Environment
    Xue Yin, Duan Yufeng
    2022, 36(3): 174-181,218. https://doi.org/10.19806/j.cnki,fbsb.2022.03.006
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The principle and technological process of the power-to-gas technology with wind energy was introduced, and the power-to-gas technology with wind energy was comprehensively evaluated by using life cycle assessment model. The life cycle assessment was carried out for each stage based on SimaPro software, while a comparison and analysis was conducted on the effects of the power-to-gas technology with wind energy and the conventional power-to-gas technology on environment. Results show that, for the global warming, the marine aquatic toxicity, and the freshwater aquatic toxicity, the influence ratios of the power-to-gas technology with wind energy on above three types of environment to the conventional power-to-gas technology are 8.24%, 12.40%, and 28.63%, respectively. The power-to-gas technology with wind energy is a feasible technology for energy utilization.
  • Research and Development of the First 660 MW Ultra-supercritical Opposed Firing Boiler with Fully Fired Zhundong High Alkali Coal
    Zhu Jia, Ran Shenming, Pan Shaocheng, Yi Guangzhou, Liu Wenjian, Tang Zhenhua, Yang Zhangning, Hu Xiukui
    2022, 36(3): 182-188. https://doi.org/10.19806/j.cnki,fbsb.2022.03.007
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The research and development of the first 660 MW ultra-supercritical opposed firing boiler with fully fired Zhundong high alkali coal was introduced, and following technologies were illustrated, such as the selection of furnace key parameters, the optimization of heat surface layout, the optimization of burner layout, the optimization of soot blower layout, etc. Results show that the boiler has a good adaptability to high alkali coal, and the comprehensive co-firing mass fraction of Zhundong high alkali coal can reach more than 90%.
  • Design Key Points of Spiral Furnace Buckstay in Ultra-supercritical Boiler
    Wang Xueyi
    2022, 36(3): 189-193. https://doi.org/10.19806/j.cnki,fbsb.2022.03.008
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking a 1 000 MW ultra-supercritical boiler as an example, analyses were conducted on the design of buckstays in the spiral furnace, and design key points of buckstays in this region were illustrated, including the force transfer of water wall tubes in the spiral furnace and vertical furnace, the force transfer between straps and buckstays in the spiral furnace, the force analysis and structural measurement of the straps, the force transfer of buckstay components, the analysis and calculation of horizontal buckstays, etc. Results show that, by setting the straps and overturning posts, the problem of the composite force transfer of the furnace vertical load and pressure load can be well solved, and the structure is safe and reliable. This may provides a solution for the complex water wall structure with buckstay design, and could serve as a design reference for similar boilers.
  • Material Selection of High Temperature Superheater/Reheater System in 630 ℃ Boiler and Corresponding Measures for Oxidation Resistance
    Lai Xianhong, Yang Huachun, Jing Shiyu, Yang Xiaochuan
    2022, 36(3): 194-197,218. https://doi.org/10.19806/j.cnki,fbsb.2022.03.009
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    For the high temperature superheater/reheater system of a 630 ℃ boiler, the candidate materials were compared and analyzed from the aspects of allowable temperature, allowable stress and oxidation resistance , and the oxidation resistance measures for the materials were discussed. Meanwhile, for austenitic heat-resistant steel and martensitic heat-resistant steel, the steam oxidation resistance measures in high temperature were proposed respectively. Material test results show that: S31035 and SP2215 are suitable for the high-temperature surface; G115, SAVE12AD and SUPER VM12 are suitable for the outlet header; G115 is suitable for the tube socket of the outlet header.
  • Discussion on Water to Steam Conversion Method of the Once Through Steam Generator in Nuclear Power Plants
    Zuo Chuangju, Sun Wenzhao, Gao Yufeng, Zhao Feng, Yu Yan
    2022, 36(3): 198-201. https://doi.org/10.19806/j.cnki,fbsb.2022.03.010
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To solve the problem of the long time conversion and the repeated conversion of the once through steam generator during water to steam conversion in nuclear power plants, a new water to steam conversion method was proposed by following measures, such as removing the main feed water control valve, controlling the working medium flow at the outlet of the steam generator by regulating the main feedwater pump speed firstly, and then using the regulating valve group at the inlet of the start flash tank to control the working medium pressure at the outlet of the steam generator. Effect predictions show that, through adopting the new type water to steam conversion method, the conversion can be reduced and the risk of the repeated conversion can be decreased. This may improve the safety and stability of the unit.
  • Development and Application of an Online Automatic Ammonia Injection Adjusting System in a 300 MW Unit
    Zhang Zhiqiang, Qu Tongliang, Shi Desheng, An Dongdong, Li Jun, Zhu Xiaolei
    2022, 36(3): 202-206. https://doi.org/10.19806/j.cnki,fbsb.2022.03.011
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    An online automatic ammonia injection adjusting system was developed, so as to adjust the opening of the ammonia injection valve. The system was applied to the flue gas duct in a 300 MW unit boiler. Results show that, with the application of the online automatic ammonia injection adjusting system, the relative standard deviation of oxynitride (NOx) mass concentration at the selective catalytic reduction (SCR) denitration system outlet is greatly reduced, while the resistance of the air preheater can be maintained in the design value for a long time, which is benefit for the economy and safety of the unit operation.
  • Transformation and Test Analysis of Primary Frequency Modulation in Offshore Wind Farms
    Zhou Shuai, Zhang Tianhai, Liu Xin, Xiao Xinyu, Tang Keyi
    2022, 36(3): 207-213. https://doi.org/10.19806/j.cnki,fbsb.2022.03.012
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    According to the requirements of Jiangsu power grid for the primary frequency modulation function of new energy stations, the primary frequency modulation transformation was carried out with an offshore wind farm in Jiangsu province as the object. The primary frequency modulation response function and the primary frequency modulation on-line monitoring function of the wind farm were realized. In addition, an on-site frequency modulation performance test was conducted on the reconstructed wind farm. The results show that the wind farm has the ability of primary frequency modulation and can participate in the frequency adjustment of the power grid. The primary frequency modulation of the wind farm will effectively reduce the frequency modulation pressure of conventional power sources (thermal power, hydropower, etc.), enhance the level of grid-source coordination, and ensure the safe and stable operation of the power grid.
  • Meshing Phase Angle Control Technology of the SSS Clutch in a Gas-Steam Combined Cycle Unit
    Yang Guang, Liu Yang, Yao Zhenglin, Yan Wenchen
    2022, 36(3): 214-218. https://doi.org/10.19806/j.cnki,fbsb.2022.03.013
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Aiming at the problem of large shaft vibration at the synchro self shifting (SSS) clutch of the gas-steam combined cycle unit with single shaft arrangement of SSS clutch, using the SSS clutch meshing phase angle control device, 0°, 60°, 180° and 280° were selected as meshing phase angles respectively to record the change data of shaft vibration during the instantaneous meshing and the whole loading process of the SSS clutch. The results show that when 180° is used as the meshing phase angle, the shaft vibration of the SSS clutch is small, which can be used as the best meshing phase angle.
  • Optimal Layout of Energy Saving and Pressure Reduction for Condensate Piping System of a 1 000 MW Unit
    Liu Ancang, Chen Jianzhong, Xie Yingwan, Yang Bao'e, Tang Qiang, Jiang Yong, Chen Mingguang
    2022, 36(3): 219-222. https://doi.org/10.19806/j.cnki,fbsb.2022.03.014
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The optimal layout of the condensate piping system of a 1 000 MW unit was carried out. The stress mechanical model and one-dimensional flow resistance model of the condensate piping system were established. The distribution of the stress and flow resistance of the piping system were found out. The results show that the pipeline with the optimal layout scheme has enough flexibility under the design conditions, and the local flow resistance of the piping system is reduced. When the unit operates at full load, the flow resistance of the condensate piping system can be reduced by about 20%.