NH4H2PO4对蔗糖粉尘爆炸的抑制作用试验研究

Experimental research on suppression of NH4H2PO4 on sucrose dust explosion

为研究NH4H2PO4粉尘对蔗糖粉尘爆炸的抑制作用,利用20 L球形爆炸试验装置分析NH4H2PO4-蔗糖混合粉尘的最大爆炸压力pmax和最大压力上升速率(dp/dt)max。结果表明:NH4H2PO4能够降低蔗糖粉尘的pmax和(dp/dt)max,并延迟其到达峰值的时间,从而降低蔗糖粉尘的爆炸强度;质量浓度分别为200、350、500、750 g/m3的蔗糖粉尘中NH4H2PO4的质量分数分别达到8%、14%、14%、13%时,蔗糖粉尘被完全惰化;质量浓度为350 g/m3的蔗糖粉尘在不同粒径(48~74、38~47、25~37μm),NH4H2PO4质量分数分别达到14%、13%、11%时被完全惰化;添加NH4H2PO4能有效减轻蔗糖粉尘的爆炸危害,且在一定粒径范围内,粒径越小,对蔗糖粉尘爆炸的抑爆效果越好。

In order to study suppression effects of NH4H2PO4 on sucrose dust explosion,the maximum explosion pressure pmax and maximum rate of pressure rise(dp/dtmax)of NH4H2PO4-sucrose mixed dust were analyzed through experiment with a 20 L spherical explosion device.The results show that NH4H2PO4 can reduce pmax and(dp/dt)max of sucrose dust and delay the time they take to reach peaks,thus weakening intensity of sucrose dust explosion.For sucrose dust whose mass concentration are 200,350,500 and 750 g/m3,they would be completely inert when mass fraction of NH4H2PO4 is 8%,14%,14%and 13%respectively.That of NH4H2PO4 at different particle sizes(48-74,38-47,25-37μm)which makes 350 g/m3 sucrose dust completely inert is 14%,13%and 11%respectively.Adding NH4H2PO4 can effectively reduce damage of sucrose dust explosion,and within a certain range of particle size,the smaller it is,the better suppression effect there will be.