连通设备粉尘爆炸泄压面积确定方法

Determination Method of Pressure Relief Area for Dust Explosion of Connected Equipment

国内外相关标准提供了单体设备的泄压面积计算方法,但连通设备的准则尚属空白.通过FLACS数值模拟,以玉米淀粉为爆炸介质,探究了连通设备内的泄爆压力和压力上升速率.结果表明:当管道长度一定时,传爆容器内最大泄爆压力随泄压面积增加而降低;在设置相同泄压面积时,传爆容器内的最大泄爆压力随管道长度的增长而增大,且达到最大泄爆压力的时间也随之延后;传爆容器所需最小安全泄压面积大于同等大小单体设备的泄压面积,说明现有单体设备的泄压面积计算方法对于连通设备不适用.通过数值拟合,对标准中单体设备的泄压面积计算公式进行修正,使其满足连通设备安全泄压要求.研究结果为连通系统的防爆设计提供参考和依据.

The relevant standards at home and abroad offer the calculation method for explosion venting area(EVA)of individual equipment,but there is a notable absence of guidelines for interconnected equipment.By means of FLACS numerical simulation,taking corn starch as the explosion medium,the reduced explosion pressure(REP)and rate of pressure rise in the connected equipment are simulated and explored.The results show that when the length of the pipe is fixed,the maximum REP in the booster vessel decreases with the increasement of the EVA.When the same EVA is set,the maximum REP in the booster vessel increases with the increase of the pipe length,and the time to reach the maximum REP value also delays.The minimum safe EVA required for the booster vessel is larger than that of the single equipment with same size,indicating that the calculation formula of the EVA of the single equipment is unreliable for the connected equipment.Through numerical fitting,the EVA calculation formula for single equipment in the standard was modified to meet the requirement of connected equipment.The research results provide reference for explosion-proof design for connected system.