煤无烟燃烧锅炉炉内燃烧特性分析  

Analysis of combustion characters in furnace for coal sootless combustion boiler

作　　者：柏静儒[1] 王擎[1] 孙佰仲[1] 刘向莉[1] 孙键[1] 

机构地区：[1]东北电力大学能源与机械工程学院,吉林132012

出　　处：《环境污染治理技术与设备》2006年第8期140-144,共5页Techniques and Equipment for Environmental Pollution Control

基　　金：吉林省杰出青年科学研究计划基金(20031024);国家教育部重点项目(02043)

摘　　要：对一台所设计的DZL1.0-0.7-AⅢ煤无烟燃烧锅炉炉内燃烧特性进行了数值模拟。对床层反应,采用了基于热力学平衡法的“黑箱模型”,而对于床层上方炉膛空间内的气相湍流燃烧则采用了标准k-ε模型、旋涡消散模型和离散坐标模型。采用非结构化四面体网格生成技术处理复杂炉膛几何空间的网格生成。通过数值模拟,得到炉内速度场,温度场,浓度场等参数的分布特性。结果表明:“多孔分层错列撞击流式”二次风的引入对于改变炉内流动和燃烧特性,加强炉内烟气和空气的混合,强化燃烧及实现炉内消烟除尘具有重要的作用。The combustion characters in the furnace of a DZL1.0-0.7-AⅢ coal-sootless combustion boiler were simulated. For coal combustion reactions on the grate, the ＂black box＂ model based on thermal dynamics equilibrium was adopted; standard k-e model, eddy dissipation approach and discrete ordinate method were accepted to deal with gas turbulent combustion over the bed. The unstructured grid generation technique was applied to deal with complex geometrical structure. Through numerical simulation, the distribution characters of velocity field, temperature distribution and species concentration distribution and other physical variances＇ distribution in the furnace were obtained. The simulation results show that ＂the stratified and staggered impinging stream type multiple-nozzle＂ secondary air alters considerably the flow and the combustion characters, strengthens the mixture of the gas and air, makes the combustion very sufficient and reduces the starting concentration of the soot in the furnace.

关 键 词：煤无烟燃烧 二次风 燃烧特性 数值模拟 

分 类 号：TK222[动力工程及工程热物理—动力机械及工程]