糖粉最大爆炸压力和爆炸下限试验研究

Experimental study on maximum explosion pressure and lower explosion limit of sugar powder

为了研究糖粉最大爆炸压力和爆炸下限与喷粉压力及点火延迟时间之间的影响关系,使用20L球形特殊条件下气体/粉尘爆炸参数试验装置进行糖粉爆炸试验,结果表明:①通过计算机输出的容器内爆炸压力时间曲线可以将糖粉爆炸过程归纳为5个阶段。②糖粉最大爆炸压力受点火延迟时间、喷粉压力共同作用影响。设定喷粉压力为1.5 MPa,糖粉最大爆炸压力先随着点火延迟时间的增加而缓慢增加,当点火延迟时间为90 ms时最大爆炸压力达到波峰值0.300 MPa;然后最大爆炸压力随点火延迟时间增加而减小。设定点火延迟时间为90 ms,糖粉最大爆炸压力随着喷粉压力的增加,呈现增加缓慢减小减小增加的变化过程,当喷粉压力为1.1 MPa时达到波峰值0.321 MPa。③喷粉压力及点火延迟时间共同影响糖粉爆炸下限浓度,试验得到糖粉爆炸下限浓度最小值为90 g/m^(3)~100 g/m^(3),喷粉压力为2 MPa,点火延迟时间为60 ms。本次试验可为糖粉生产企业避免粉尘爆炸事故提供参考。

In order to study the relationship between the maximum explosive pressure and the lower explosive limit of sugar powder and the spraying pressure and ignition delay time,a 20 L spherical gas/dust explosion parameter test device was used to the explosive test.The results show that:①the explosion process of sugar powder can be divided into five stages by analyzing the pressure-time curve of explosion test from computer system.②The ignition delay time and spraying pressure affect the maximum explosion pressure of sugar powder collectively.When spraying pressure was set at 1.5 MPa,the maximum explosion pressure of sugar powder increased slowly with the ignition delay time increasing firstly.When the ignition delay time was 90 ms,the maximum explosion pressure reached the peak value of 0.300 mpa.Then the explosion pressure decreased with the ignition delay time increasing.When the ignition delay time was set at 90 ms,the maximum explosion pressure of sugar powder showed a process of increase-slowly decrease-reduce-increase with the increase of the spraying pressure.When the spraying pressure was 1.1 MPa,the peak value of the wave reached 0.321 MPa.③The spraying pressure and ignition delay time jointly affect the lower explosion limit of sugar powder,and the test results show that the minimum lower explosion limit of sugar powder was 90 g/m^(3)~100 g/m^(3),when the spraying pressure was 2MPa and the ignition delay time was 60ms.This test can provide reference for sugar powder production enterprises to avoid dust explosion accidents.