摘要：针对循环流化床煤气化炉的传统流动密封阀在高循环流率工况下存在抗逆压差性能不足的问题,设计了3种具有不同上升段与下降段管径比和插深比的流动密封阀;通过开展冷态实验,研究了上升段结构的不同参数对流动密封阀运行特性的影响规律。研究结果表明:在正常运行工况下,增大上升段与下降段的管径比有利于提高流动密封阀的循环流率与抗逆压差能力;上升段插深比过大时不利于循环回路稳定运行;通过对比3种流动密封阀运行特性发现管径比为1. 4、插深比为1. 0时的流动密封阀具有最佳的返料能力与抗逆压差能力。

关键词：流动密封阀；上升段结构；运行特性；抗逆压差；循环流率

Abstract: In order to solve the problems of insufficient adverse pressure differential performance of traditional loop seal in circulating fluidized bed coal gasifier under high circulating flow rate，three new loop seals with different pipe diameter ratio in ascending and descending sections and insert depth ratio were designed．Through the cold experiment，the influence of different parameters on the operating characteristics of loop seal was studied．The results show that under normal operating conditions，increasing the pipe diameter ratio of the ascending and descending sections is beneficial to improving the circulating flow rate and the ability to withstand the differential pressure of the loop seal．But excessive insert depth ratio threatens the system stability．By comparing the operation characteristics of three loop seals，the loop seal with a pipe diameter ratio of 1．4 and an insert depth ratio of 1．0 possesses the best material-returning capability and adverse pressure difference capacity． 

Keywords: loop seal; ascending structure; operating characteristics; adverse pressure differential; circulating flow rate