秸秆直燃锅炉气相流场数值模拟与停留时间计算  

NUMERICAL SIMULATION ON THE GAS FLOW FIELD AND CALCULATION OF THE RESIDENCE TIME IN THE STRAW-FIRED BOILER

作　　者：周骛[1] 赵长遂[1] 任强强[1] 吴新[1] 刘博[1] 梁财[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《太阳能学报》2011年第9期1344-1348,共5页Acta Energiae Solaris Sinica

基　　金：江苏省科技成果转化专项资金项目(BA2007023)

摘　　要：采用计算流体动力学方法对某电厂75t/h秸秆直燃锅炉建立了实际尺寸的冷态数学模型并用现场数据加以验证。模拟示踪剂脉冲进样,通过监测炉膛出口示踪剂质量流率的变化,计算气体在炉膛内的停留时间。结果显示:随着总风量的减小,气体平均停留时间增加;在所研究的工况内,总风量不变时,二次风比例的增大对平均停留时间的影响不大,但停留时间分布曲线呈现早出峰、低峰值、长拖尾的现象,说明气体混合更均匀。CFD method was employed to establish an actual size cold model for a 75t/h straw-fired boiler, whose experimental data were used for validation. Pulsed sampling of a tracer was simulated and the gas residence time distribution and mean residence time could be derived from the time variation of the tracer＇ s mass flow rate from the furnace outlet. The results showed that the gas mean residence time increases with the decreasing of total air flow. Among the conditions studied, under the same total air flow, the mean residence time does not change much as the fraction of secondary air increased, while the residence time distribution curve displays the characteristics of early appearance of peak, low peak and long tail, indicating more well-mixed gas flow.

关 键 词：秸秆直燃锅炉 流场 计算流体动力学 二次风 气体停留时间 

分 类 号：TK6[动力工程及工程热物理—生物能]