SU Pengyi1,2，DONG Pengfei1，WANG Xiaofang1，DENG Chaoyang1,2，ZHU Zhiping1,2
(1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China)
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
收稿日期： 2019-09-29，修回日期：2020-02-11，在线出版时间：2020-04-03 15:30。
文章编号：1008-5548(2020)03-0031-08
DOI:10.13732/j.issn.1008-5548.2020.03.005
中图分类号：TQ545 文献标志码：A
基金项目：国家重点研发计划项目，编号：2017YFB0602302；北京市科技计划资助项目，编号：Z181100005118006。
第一作者简介：苏鹏翼(1994—)，男，硕士研究生，研究方向为循环流化床流动密封阀的返料性能。E-mail：supengyi@iet.cn。
通信作者简介：董鹏飞(1983—)，男，博士，助理研究员，研究方向为煤气化及流态化。E-mail：dongpengfei@iet.cn。
