燃用宽筛分煤循环流化床锅炉燃烧模拟计算

Numerical Simulation of the Combustion in a Large Mesh Size Coal Fired Circulating Fluidized Bed Boiler

建立了循环流化床锅炉炉膛颗粒燃烧和脱硫反应模型。该模型考虑了炉膛下部为高颗粒浓度的密相区和上部为低颗粒浓度的稀相区的特征。模拟计算给出了烟气温度、热流密度和各气体成分（Ｏ２、Ｃ２Ｏ、ＣＯ、Ｈ２Ｏ和Ｓ２Ｏ）的轴向分布。模拟计算结果的趋势是合理的。

Described in this paper is a mathematical model of large mesh size coal particle combustion and desulfurization reaction in a circulating fluidized bed boiler furnace. The model has taken into account such specific features as a dense phase zone involving high particle size concentration at the furnace lower portion and a dilute phase zone at the furnace upper portion dominated by low particle size concentration. As a result of simulation computations obtained are the flue gas temperature, heat flux and the axial distribution of various gas components (O 2 , C 2O, CO, H 2O and S 2O). The trend as indicated by the results of the simulation calculation is found to be rational.