一种封闭罩内顺流多旋臂气液分离器的分离特性研究  

Study on the separation characteristics of a downstream gas-liquid vortex separator in a closed hood

作　　者：高金明 郭玉娇 鄂承林[1] 卢春喜[1] GAO Jinming;GUO Yujiao;E Chenglin;LU Chunxi(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《化工学报》2023年第7期2957-2966,共10页CIESC Journal

基　　金：国家自然科学基金委创新群体项目(22021004)。

摘　　要：为了解决多旋臂气液旋流分离器(GLVS)中旋臂上方存在的小液滴夹带逃逸现象,设计了一种封闭罩内顺流多旋臂气液分离器(D-GLVS)。通过大型冷模实验,从压降和分离效率角度考察了其分离性能,实验结果表明,D-GLVS通过增加封闭罩,分隔了分离空间和排气空间,使排气压降占比较大,约为总压降的60%,但其阻力系数仍在常规旋风分离器的范围内;且其分离效率随气速增大,表现为先升高后降低的变化趋势,并在14.69 m/s附近达到最大值,同时发现偶数个喷嘴数对应进液质量的分离效率明显比奇数个喷嘴更高,这一结果在逆流式多旋臂气液分离器(B-GLVS)中同样得以证实。进一步对比了D-GLVS和B-GLVS间分离性能差异,结果表明封闭罩的引入可以极大地改善B-GLVS中小液滴被气流夹带逃逸的现象,使气液分离效率有明显提升,同时使D-GLVS分离效率随气速的变化规律与常规旋风分离器更为相似。在低气速下,二者的总压降几乎相同,当旋臂喷出口气速较大时,D-GLVS的总压降略大于B-GLVS,增幅均值约为5.04%。To solve the escape phenomenon of small droplets entrained above the swirling arm in the gas-liquid vortex separator(GLVS),a downstream gas-liquid vortex separator in a closed hood(D-GLVS)was designed.The pressure drop characteristics and separation efficiency of D-GLVS were investigated in a large-scale cold separator model.The experimental results show that D-GLVS separates the separation space and exhaust space by adding a closed hood,resulting in a relatively large proportion of the exhaust pressure drop,about 60%of the total pressure drop.However,its resistance coefficient is still within the range of common cyclone separators.The separation efficiency increases first and then decreases with the increase of swirl arm velocity,and reaches the maximum near the swirl arm velocity of 14.69 m/s.The separation efficiency corresponding to the inlet mass of even nozzles is obviously higher than that of odd nozzles,which is also confirmed in the backward gas-liquid vortex separator(BGLVS).The separation performance differences between D-GLVS and B-GLVS are further compared.The results show that the closed hood can optimize the internal airflow direction and greatly improve the escape of droplets from B-GLVS entrained by the airflow,leading to a significant increase in gas-liquid separation efficiency.The separation efficiency of D-GLVS is more similar to that of a common cyclone separator.At low gas velocity,the total pressure drop of the two is almost the same.When the gas velocity at the jet outlet of the spiral arm is higher,the total pressure drop of D-GLVS is slightly larger than that of B-GLVS,with an average increase of about 5.04%.

关 键 词：离心分离 气液两相流 压降 分离效率 气液顺流 

分 类 号：TQ028.4[化学工程]