大型储煤筒仓进料过程煤尘浓度分布及煤尘爆炸数值模拟  

Numerical simulation of concentration distribution of coal dust during feeding process and coal dust explosion in large coal silo

作　　者：马瑞 魏芸[1] 刘晅亚 陈晔 MA Rui;WEI Yun;LIU Xuan-ya;CHEN Ye(CCCC First Harbor Consultants Co.,Ltd.,Tianjin 300222,China;Tianjin Fire Science and Technology Research Institute of MEM,Tianjin 300381,China)

机构地区：[1]中交第一航务工程勘察设计院有限公司,天津300222 [2]应急管理部天津消防研究所,天津300381

出　　处：《消防科学与技术》2021年第12期1728-1732,共5页Fire Science and Technology

基　　金：天津市交通运输科技发展计划项目(2019-09)。

摘　　要：采用Fluent模拟进料过程中仓内煤尘浓度场分布,在此基础上基于OpenFOAM平台开展煤尘爆炸过程数值模拟,以指导大型储煤筒仓安全设施的布置。结果表明:仓内竖向空间越小,煤尘竖向浓度梯度越明显,空间内平均浓度越高,空仓、半仓条件下筒仓竖向几何中心线上煤尘质量分数分别达到30%、40%以上;仓内竖向空间越小,筒仓内最大爆炸温度越高,但最大爆炸超压越小,空仓、半仓条件下最大爆炸温度分别可达2 000、3 000 K,最大爆炸超压分别为1、0.82 MPa;建议在筒仓顶部及侧壁靠上部位设置煤尘浓度监测及预警装置,并在筒仓顶部设置有效的泄爆装置,以有效防范筒仓爆炸风险、降低筒仓爆炸损失。A numerical simulation of the concentration distribution of coal dust in the silo during the feeding process was carried out in this paper by using Fluent software,and then on this basis,a numerical simulation of the process of coal dust explosion was carried out based on the Open FOAM platform,to guide the layout of related safety facilities in the large coal silo.The results show that the smaller the vertical space in the silo is,the more obvious the vertical concentration gradient of coal dust is,and the greater the average concentration in the space is.The mass fraction of coal dust on the vertical geometric centerline of the silo under the empty and half-full silo conditions reaches above 30% and 40% respectively.The smaller the vertical space in the silo is,the greater the maximum explosion temperature in the silo is,but the smaller the maximum explosion overpressure is.Under the empty and half-full silo conditions,the maximum explosion temperature reaches 2 000 K and 3 000 K respectively,and the maximum explosion overpressure is 1 MPa and 0.82 MPa respectively.It is recommended to install the coal dust concentration monitoring and early warning devices on the top of the silo and the upper part of the side wall,and install effective explosion venting devices on the top of the silo,in order to effectively prevent the risk and reduce the loss of silo explosion.

关 键 词：储煤筒仓 煤尘浓度 煤尘爆炸 数值模拟 

分 类 号：X932[环境科学与工程—安全科学] TU398[建筑科学—结构工程]