大型循环流化床锅炉炉膛内床压摆动的机理  

Wobble Mechanism of Pressure Drop in Furnace of a Large Scale CFB Boiler

作　　者：李金晶[1] 吕俊复[2] 龚鹏[1] 米子德[1] 张清峰[1] 

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]清华大学热能工程系,热科学与动力工程教育部重点实验室,北京100084

出　　处：《动力工程学报》2013年第4期245-249,共5页Journal of Chinese Society of Power Engineering

基　　金：国家重点基础研究规划(973)资助项目(2012CB214900)

摘　　要：针对单炉膛多分离器并联结构的大型循环流化床(CFB)锅炉在特定运行工况下出现的炉膛内床压摆动现象,通过建立多分离器并联的CFB锅炉主循环回路物料平衡模型,结合工业试验数据,定性分析了床压摆动过程中固体物料横向质量流量方向和数值的变化.结果表明:由炉膛两侧流动不平衡导致的固体物料横向流动是炉膛两侧存料量变化的主导因素;炉膛与返料器之间的物料交换对床压摆动具有一定的迟滞作用.To study the mechanism of pressure drop wobble occurring under specific working conditions in furnace of a large scale CFB boiler that adopts the design of single riser and parallel cyclones, a mass bal ance model was built up for the main loop of CFB boiler. Based on the data collected from industrial tests, the rates and directions of lateral mass flow in the CFB riser were analyzed qualitatively. Results show that the wobble of bed inventory is mainly due to lateral mass transfer caused by the unbalance of gas-solid flow at both sides of the furnace. The mass transfer between furnace and loopseal delays the process of pressure drop wobble.

关 键 词：循环流化床锅炉 床压 横向物料流动 数学模型 

分 类 号：TK222[动力工程及工程热物理—动力机械及工程]