大型循环流化床锅炉炉膛内床压摆动的机理

摘要

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 balance 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.%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.