考虑金属蓄热情况下超临界循环流化床锅炉水冷壁流动不稳定性数值分析  

Numerical Analysis on Flow Instability of Supercritical CFB Boiler Water Wall Considering Metallic Heat Storage

作　　者：谢贝贝[1] 龙俊[1] 茆凯源 王文毓[1] 杨冬[1] 夏良伟[2] 殷亚宁[2] 

机构地区：[1]西安交通大学能源与动力工程学院多相流国家重点实验室,西安710049 [2]哈尔滨锅炉厂有限责任公司高效清洁燃煤电站锅炉国家重点实验室,哈尔滨150046

出　　处：《动力工程学报》2016年第8期589-593,共5页Journal of Chinese Society of Power Engineering

基　　金："十二五"国家科技支撑计划资助项目(2015BAA03B01-01)

摘　　要：建立了考虑金属蓄热情况下超临界循环流化床(CFB)环形炉膛锅炉流动不稳定性分析的数学模型,采用交错网格对超临界CFB环形炉膛锅炉水冷壁流动不稳定性进行模拟,计算分析了对回路施加热负荷扰动后进、出口质量流量及金属壁温随时间的变化.结果表明:施加1.1倍、1.2倍和1.3倍热负荷扰动后,进、出口质量流量随时间呈反相脉动,最终进、出口质量流量相等且恢复到稳态值,金属壁温随时间波动后也维持在一常数值,表明该工况下水冷壁流动仍是稳定的.A mathematical model was established for analysis on flow instability in annular furnace of a su- percritical CFB boiler considering metallic heat storage, with which the flow instability was simulated using staggered grids, so as to calculate and analyze the variation of inlet and outlet mass flow as well as tube wall temperature along with time under thermal load disturbance on the loop. Results show that once the loop was applied by 1.1, 1.2 and 1.3 times of thermal load disturbance, the inlet and outlet mass flow would fluctuate reversely along with time, both of which would finally get equivalent at the value of steady state; besides, the wall temperature would also fluctuate with time and finally get stable at a constant value, indicating that the flow condition is still stable.

关 键 词：超临界循环流化床锅炉 环形炉膛 金属蓄热 水冷壁 流动不稳定性 数值分析 

分 类 号：TK122[动力工程及工程热物理—工程热物理]