循环流化床返料装置1维动力学模型  

One-dimensional hydrodynamic model of the recycling valve in a circulating fluidized bed

作　　者：冯蘅[1] 李清海[1] 甘超[1] 蒙爱红[1] 张衍国[1] 

机构地区：[1]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,二氧化碳资源化利用与减排技术北京市重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2014年第2期229-234,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(2011CB201502);国家"十二五"科技支撑计划项目(2010BAC66B03)

摘　　要：为研究物料循环流率和通气量等因素对返料装置立管中料柱高度的影响,该文依据Loop-seal气动阀门和立管内气固流动特性,建立了1维动力学模型。模型的计算值与实验结果基本吻合。在一定范围内,随着物料循环流率的增大,返料装置通过分配进入立管和排料室的通气量,增加料柱高度,实现回路的压力平衡。若物料循环流率超过临界值,返料装置将失去自适应能力,物料会溢出立管并进入分离器,破坏系统的稳定运行。适当增大通气量,可增强返料装置的自适应性,并扩大稳定运行的范围。该模型为立管高度较低的循环流化床返料装置的设计和优化提供了参考。This study focuses on the influence of key factors, such as solids circulation rate and the aeration rate, on the solids height in the standpipe of the recycling valve. A one-dimensional hydrodynamic model is developed based on the hydrodynamics of the gas-solid flow in the loop-seal and the standpipe. The predicted heights agree well with experimental data. Redistribution of the aeration ratio in the standpipe and the discharge chamber increases the solids height in the standpipe to adapt to increasing solids circulation rates and to balance the pressures in the circuit. The results also indicate that if the solids circulation rate is over a critical value, the recycling valve will lose its self-adaptability and the solids will rise out of the standpipe and into the cyclone separator. The self-adaptability can be enhanced and the stable operation range of the recycling valve can be extended by properly increasing the aeration rate. This model is useful for the design and optimization of circulating fluidized bed recycling valves with relatively short standpipes.

关 键 词：循环流化床 返料装置 1维动力学模型 立管料柱高度 

分 类 号：TK222[动力工程及工程热物理—动力机械及工程]