摘要
为治理落煤过程中产生的粉尘问题,基于涡旋气流的生成机制及粉尘粒子在涡旋气流场中的运移特性,提出一种控制落煤过程中粉尘扩散的涡旋吹吸式除尘技术;以落煤塔落煤过程为例,利用数值模拟方法分析涡旋吹吸式除尘气流场的变化特征;搭建仿真试验模型,通过仿真试验研究设备最佳涡旋性能参数,对比分析涡旋吹吸式除尘与单一抽吸除尘的除尘性能。结果表明:落煤过程中形成涡旋气流,大部分粉尘粒子被涡旋集聚,呈螺旋状自下而上运动。最佳吹吸比为4.814时,涡旋气流性能最佳;涡旋吹吸除尘性能高于单一抽吸,单位时间集尘质量浓度分别为314.27、191.94 mg/m^(3),除尘效率分别为93.25%和41.19%,粉尘逃散率分别为6.31%和46.60%。
In order to control dust in the process of coal falling,based on generation mechanism of vortex and migration feature of dust particles in vortex airflow field,a vortex blowing-suction dust removal technology was put forward to control dust dispersion during coal falling.Then,with a coal falling tower as an example,numerical simulation was used to analyze variance law of airflow field.Finally,a simulation experiment model was built,optimal vortex performance of devices was studied,and dust removal performance of proposed technology was compared with that of single suction one.The results show that vortex airflow is formed during coal falling process,and most of dust particles are collected by vortex,migrating bottom-up in a spiral pattern.Vortex performance will be the best at an optimal blowing ratio of 4.814.And dust removal performance of vortex blowing-suction dedusting technology is better than that of single one,with dust collection concentration per unit time being 314.27 and 191.94mg/m^(3),dust removal efficiency of 93.25%and 41.19%,and escape rate of 6.31%and 46.60%respectively.
作者
荆德吉
贾鑫
张天
孟祥曦
马明星
王志恒
JING Deji;JIA Xin;ZHANG Tian;MENG Xiangxi;MA Mingxing;WANG Zhiheng(College of Safety Science and Engineering,Liaoning Technical University,Fuxin Liaoning 123000,China;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education(Liaoning Technical University),Fuxin Liaoning 123000,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2021年第6期121-127,共7页
China Safety Science Journal
基金
国家自然科学基金青年基金资助(51704146)
辽宁省自然科学基金资助(2020-MS-304)。
关键词
落煤过程
涡旋吹吸式除尘
落煤塔
数值模拟
除尘技术
coal falling process
vortex blowing and suction dedusting
coal-falling tower
numerical simulation
dust removal technology
