摘要
分解炉是新型干法水泥生产线上预分解技术的核心设备和关键技术装备之一,其性能优劣直接影响到系统能耗、环保排放以及整个系统的生产效率。将数值模拟方法应用于分解炉的复杂燃烧过程研究,以强化悬浮式分解炉为研究对象,结合气固二相流理论,对煤粉的燃烧模拟采用非预混燃烧模型,对挥发份的燃烧采用概率密度函数模型,焦碳的燃烧采用表面反应PDF模型,挥发份的析出模型选用两步竞争反应模型,燃烧的辐射传热采用P-1模型进行模拟。数值计算采用二阶迎风差分和SIMPLE算法,求解方程采用TDMA逐面迭代和低松弛因子。对分解炉内煤粉的燃烧过程进行的数值模拟揭示分解炉内煤粉的燃烧机理,为煤粉内优化燃烧提供理论依据和有利的信息。
The performance of precalciner in the dry-process precalciner kiln technology, has great effect on energy consumption, pollutants discharge and producing efficiency of the system. In this paper, CFD numerical simulations of three-dimensional turbulent flow in 2500 t/d Reinforced Suspension Precalciner were studied. Non-premixed combustion model is adopted in simulating coal combustion; volatiles combustion is expressed with the probability density function model; char combustion is expressed with the surface reaction model; released rate of the volatiles is expressed with the two competing rates model. In the calculating process, second order upwind difference and SIMPLE arithmetic is adopted. The results of simulation disclose and predict the combustion mechanism of pulverized coal in precalciner, which can provide theoretical reference and useful information for the optimization of combustion of coal in RSP precalciner.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2007年第7期903-906,共4页
Computers and Applied Chemistry
基金
湖北省科技攻关资助项目(20061AA101C29)
关键词
分解炉数值模拟
燃烧机理
PDF模型
precalciner, numerical simulation, combustion mechanism, PDF model
