摘要
总结了中国首台投入商业运行的300MW循环流化床机组仿真机开发中的建模经验,着重分析了仿真机中流动、传热和燃烧建模3个方面的关键模型。结果表明:裤衩腿结构炉膛的物料不平衡现象和炉膛上部的物料横向流动是导致翻床的根本原因。仿真计算中使用的传热模型应该兼顾反映机理和运算速度。根据各种反应的速率快慢应该对煤燃烧过程实行计算解耦,可以在保证计算精度条件下提高计算速度。给出了翻床和外置床调温过程的仿真实例。
The model characteristics of the first commercialized 300 MW circulating fluidized bed boiler simulator in China were analyzed, with emphasis on the models for the gas-solid two phase flow, heat transfer and combustion. The mass imbalance in the pant-legs and the horizontal flow of solid particles in the upper furnace are the key cause of bed inventory overturn. The heat transfer model is not only physically realistic, but also very efficient. The analysis of the combustion process can be simplified according to the differences in the reaction rates to increase the calculational speed without additional error. Example simulations are given to illustrate the system.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第11期1813-1817,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家“十一五”科技项目(2006BAA03B00)
关键词
循环流化床锅炉
仿真
两相流动
传热
煤燃烧
circulating fluidized bed boiler
simulation
gas-solid two phase flow
heat transfer
coal combustion
