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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Simulation on coal-fired supercritical CO2 circulating fluidized bed boiler: Coupled combustion with heat transfer
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Simulation on coal-fired supercritical CO2 circulating fluidized bed boiler: Coupled combustion with heat transfer

机译：燃煤超临界CO2循环流化床锅炉仿真：热传递耦合燃烧

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摘要

Using supercritical carbon dioxide (S-CO2) as the working fluid integrated in a circulating fluidized bed (CFB) boiler is a rising technology used to improve the power generation efficiency and reduce gas pollutant emissions in coal-fired power generation systems. This study established a comprehensive 3-D model based on an Eulerian-Lagrangian frame to simulate the combustion process. A new method was presented using constant heat flux as the boundary obtained from the coupled simulation of heat transfer and combustion. The gas phase was described with large eddy simulation (LES). The solid phase used the multi-phase particle-in-cell (MP-PIC) approach. Simulations were carried out in a 10 MW S-CO2 CFB boiler (with cross section area of 3.557 x 3 m(2) and height of 21.01 m). Combustion characteristics obtained in boundary heat flux and excess air ratio were numerically investigated. Results showed that the temperature profile was relatively uniform in the whole boiler and the furnace temperature increased with the increase of boundary heat flux. Emissions of CO2 and SO2 declined with the increase of boundary heat flux while CO emission increased. An increased excess air ratio caused a decrease in furnace temperature and the rise of CO and SO2. The characteristics of combustion and pollutant emissions were optimal with the heat flux at around 25-37 kW/m(2) and an excess air ratio at 1.18-1.25. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译：使用超临界二氧化碳（S-CO2）作为集成在循环流化床（CFB）锅炉中的工作流体是一种用于提高发电效率并降低燃煤发电系统中的气体污染物排放的上升技术。本研究建立了基于Eulerian-Lagrangian帧的全面的三维模型来模拟燃烧过程。使用恒定热通量提出一种新方法，作为从传热和燃烧的耦合模拟获得的边界。通过大涡模拟（LES）描述了气相。固相使用多相粒子粒细胞（MP-PIC）方法。模拟在10 MW S-CO2 CFB锅炉中进行（横截面积为3.557×3m（2）和21.01米的高度）。在数值上研究了在边界热通量和过量空气比中获得的燃烧特性。结果表明，随着边界热通量的增加，温度曲线在整个锅炉中相对均匀，炉温增加。随着界限热通量的增加，CO2和SO2的排放量下降，而CO发射增加。增加的过量空气比率导致炉温减少和CO和SO2的兴起。燃烧和污染物排放的特性是最佳的，热通量约为25-37 kW / m（2），在1.18-1.25时的空气比率过高。 （c）2019年日本粉末技术学会。由elsevier b.v发表。和日本粉末科技会。版权所有。

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