摘要
通过实验分别考察了满床/空床操作模式对内置颗粒床-旋流耦合分离器分离性能的影响,获得了两种操作模式下的设备压降和捕集效率。通过改变入口粉尘浓度、入口气速和粉尘颗粒种类,发现满床操作条件下的分离效率比空床操作条件下的分离效率高,且前者压降较低。通过对出口粉尘粒径的分析,含有捕集颗粒的内置颗粒床可有效提高5μm以下的粉尘颗粒的捕集效率,弥补了离心分离的短板。引入性能指数对不同操作模式进行定量分析,验证了满床操作条件下的耦合分离设备具有更好的综合分离性能。
A significant proportion of the dust in industrial flue gas is melted particles and these particles can cause problems such as blockages,wear,and corrosion in heat exchangers.Therefore,these melted dust particles must be removed before heat recycling.A separator coupling the cyclone with the built-in granular bed filter has been put forward.By investigating the influences of the full bed/empty bed operation on the coupled separator,the pressure drop and the collection efficiency were obtained under two different operations,respectively.Comparative experiments were carried out in a pilot-scale cold-model experimental apparatus.The inlet dust concentrations varied from 5.95 g/m^(3) to 59.13 g/m^(3) and the inlet velocity varied from 9.06 m/s to 13.59 m/s,respectively.The experimental results indicated that the collection efficiency under the full bed condition was higher than that under the empty bed condition.While the entrainment effect on the trapped dusts and the collector particles was enhanced by high inlet gas velocity,the collection efficiency of the built-in granular bed filter was increased.Besides,the pressure drop was much lower under the full bed operation.As the downward movement of the collector particles,the dust cake formed on the inner screen surface was continuous rubbed so that the cake thickness was retrained.Based on the particle size analysis,the collection efficiency of the dusts below 5μm was improved due to the built-in granular bed filled with the collector particles.It was evident that the collection efficiency was further improved by combining different separation mechanisms in the cyclone.According to parameter,i.e.,the quality factor,the coupled separator with the collector particles was verified to have a better comprehensive performance both on the collection efficiency and the pressure drop.In general,the collection efficiency and the stability were strengthened by the introduction of the built-in granular bed filter in the coupled separator.In addition,these self-cleaning phenomenons should be investigated in the future.
作者
常明
付金壮
李永祺
范怡平
卢春喜
Ming CHANG;Jinzhuang FU;Yongqi LI;Yiping FAN;Chunxi LU(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2022年第5期631-639,共9页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:22021004)
石油化工联合基金资助项目(编号:U1862202)。
关键词
内置颗粒床
旋风分离器
耦合分离器
压降
分离效率
性能指数
built-in granular bed
cyclone
coupled separator
pressure drop
collection efficiency
quality factor
