谷物粉尘爆炸特性试验研究  

Experimental study on explosive characteristics of grain dust in beer enterprise

作　　者：王玉娇[1] 赵江平[1] WANG Yujiao ZHAO Jiangping(College of Material Science and Mineral Information, Xi＇an University of Architecture ＆ Technology,Xi＇an Shaanxi 710055,China)

机构地区：[1]西安建筑科技大学材料与矿资学院,陕西西安710055

出　　处：《中国安全科学学报》2017年第4期77-81,共5页China Safety Science Journal

摘　　要：为了解国内某啤酒企业平筛工艺过程除尘系统新鲜谷物粉尘爆炸特性,采用1.2 L哈特曼管式粉尘爆炸试验装置进行试验,以研究其粉尘粒径、质量浓度、含水率因素对谷物粉尘爆炸压力(P)及爆炸压力上升速率(d P/dt)的影响。结果表明,该谷物粉尘爆炸下限(LEL)质量浓度为125~166.67 g/m^3,质量浓度为291.67g/m^3时存在最大爆炸压力P_(max)和最大爆炸压力上升速率(d P/dt)max,分别为1.81 MPa和10 MPa/s;d P/dt与P变化具有相似性。谷物粉尘粒径由98~105μm增加至180~1 250μm,其LEL质量浓度由50~58.33 g/m^3增加至141.67~150 g/m^3,且P由0.90 MPa降低至0.72 MPa;含水率由6.39%降低至0(绝对干燥)时,P由1.3 MPa增加至2.1 MPa。In order to learn explosion characteristics of the grain dust collected from the dust removal sys- tem for bolting procedure in beer enterprise in China, experiments were carried out by means of an 1.2 L Hartman dust explosion test facility. Influences of particle size, mass concentration, moisture content and on the explosion pressure （P） and the rate of pressure rise （dP/dt） were studied.The results show that grain dust LEL is between 125-166.67 g/m^3, that the Pmax is 1.81 MPa and （dP/dt）max is 10 MPa/s when the concentration is 291.67 g/m^3 ,that the change in P and dP/dt are similar, that the increase of the particle size from 98-105 μm to 180-1 250 μm makes the LEL increase from 50-58.33 g/m^3 to 141.67-150 g/m^3 and the explosion pressure drop from 0.9 MPa to 0.72 MPa, and that the decrease of moisture content from 6.39% to 0% （ absolute dry condition） makes explosion pressure increase from 1.3 MPa to 2.1 MPa.

关 键 词：谷物粉尘 爆炸下限(LEL) 爆炸压力 爆炸压力上升速率 粉尘粒径 

分 类 号：X932[环境科学与工程—安全科学]