A simulation study of coal combustion under O2/CO2 and O2/RFG atmospheres in circulating fluidized bed
A simulation study of coal combustion under O2/CO2 and O2/RFG atmospheres in circulating fluidized bed
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DOI：
10.1016/j.cej.2013.03.051
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发表时间：
2013-05
影响因子：
15.1
通讯作者：
Wu Zhou;Changsui Zhao;L. Duan;Xiaoping Chen;Daoyin Liu
中科院分区：
文献类型：
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作者：
Wu Zhou;Changsui Zhao;L. Duan;Xiaoping Chen;Daoyin Liu
采用Euler-Euler模型对循环流化床燃烧器内煤的燃烧过程进行了数值模拟。考虑了气固两相流动、传热、传质和化学反应的非稳态过程。通过数值模拟，研究了O2浓度为21- 40%时，O2/CO2燃烧模式（气瓶中O2和CO2的混合物作为氧化剂）和O2/RFG燃烧模式（O2和循环烟气的混合物作为氧化剂）下的压力、固体体积分数、温度和气体浓度（O2、CO2、H2O、CO、NO和SO2）的分布。对两种情况进行计算，保持相同的煤进料速率和保持相同的氧化剂体积流速。在30%O2/70%CO2气氛下，对模拟的温度分布、压力分布和出口气体浓度进行了实验验证。
The Euler–Euler modeling approach was employed to simulate the coal combustion in a circulating fluidized bed combustor. The unsteady processes of gas–solid two phase flow, heat transfer, mass transfer and chemical reactions were considered. By numerical simulation, distributions of pressure, solid volume fraction, temperature and gas concentrations (O2, CO2, H2O, CO, NO and SO2) were studied in O2/CO2combustion mode (mixture of O2and CO2from gas bottles as oxidant) and O2/RFG combustion mode (mixture of O2and recycled flue gas as oxidant) with O2concentration range of 21–40%. Calculations were made for two cases, maintaining the same coal feed rate and maintaining the same oxidant volume flow rate. Simulated temperature distribution, pressure distribution and outlet gas concentrations were validated by the experimental data in 30% O2/70% CO2atmosphere.