相变凝聚器内可溶颗粒生长及脱除过程  

Growth and removal of soluble particles in phase-change agglomerator

作　　者：彭小成 金平 王家瑞[1] 王斯民[1] PENG Xiaocheng;JIN Ping;WANG Jiarui;WANG Simin(School of Chemical Engineering and Technology,Xi′an Jiaotong University,Xi′an 710049,Shaanxi Province,China;SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Co.,Ltd.,Dalian 116045,Liaoning Province,China)

机构地区：[1]西安交通大学化学工程与技术学院,陕西西安710049 [2]中石化(大连)石油化工研究院有限公司,辽宁大连116045

出　　处：《化学工程》2023年第7期45-49,60,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(22108216)。

摘　　要：针对湿法脱硫过程形成的大量可溶性细微颗粒,加装相变凝聚器对烟气进行降温,利用蒸汽凝结促使可溶颗粒物长大,并在惯性作用下与换热管壁面碰撞从而被捕集脱除。基于凝结生长理论构建可溶颗粒在相变凝聚器内凝结生长的数值模型,分析气固两相的相互作用和流动特性。结果表明:可溶颗粒凝结生长后,最大粒径超过40μm,平均粒径从入口处的1μm增大至出口处的9.16μm,水汽凝结释放大量热量提高了气相主体温度。在此基础上,分析进口气速、颗粒质量浓度以及水蒸气质量分数对颗粒脱除效率的影响,当速度达到5 m/s左右时,脱除效率达到最高为48.8%;颗粒质量浓度增加,脱除效率下降,但下降速度逐渐减小;随进口烟气水蒸气质量分数的增加,脱除效率呈线性增大。For a large number of soluble fine particles formed in the wet desulfurization process,the flue gas was cooled by adding a phase-change agglomerator,and the heterogeneous condensation was used to promote the growth of soluble particles,which would collide with the wall of the heat exchange tube bundle under the inertial action.Based on the condensation growth theory of soluble particles,a numerical model of the condensation growth of soluble particles in the phase-change agglomerator was built.The results show that after the soluble fine particles condense and grow up in the phase-change agglomerator,the maximum particle size exceeds 40μm,the average particle size increases from 1μm at the inlet to 9.16μm at the outlet.The large amount of heat released by water vapor condensation increases the temperature of the gas phase.On this basis,the effects of inlet gas velocity,particle mass concentration and water vapor mass fraction on particle removal efficiency were analyzed.When the velocity reaches about 5 m/s,the maximum removal efficiency is 48.8%.With the increase of particle mass concentration,the removal efficiency decreases,but the decreasing speed gradually reduces.The removal efficiency increases linearly with the increase of water vapor mass fraction of inlet flue gas.

关 键 词：可溶颗粒 凝结生长 相变凝聚器 数值模拟 

分 类 号：TK121[动力工程及工程热物理—工程热物理]