初始湍流对粉尘爆炸影响的实验研究

采用大型实验装置对管道相连的粉尘操作设备中粉尘爆炸的火焰和压力传播过程及其影响因素进行实验研究。实验装置由两个通过管道连接的不同体积容器构成,爆炸从一个容器中通过管道传播到另一个容器中。在不同的初始湍流度条件下进行粉尘爆炸实验,测试不同位置的火焰和压力信号。结果表明:随着初始湍流度的增大,爆炸的猛烈程度增强,火焰和冲击波的传播速度加快,初始湍流作为影响粉尘爆炸发展过程的重要因素之一,在进行粉尘爆炸的安全防护和设计时必须考虑其作用。

Experimental Investigation on Influence of Pre-ignition Turbulence on Dust Explosion

The propagating process of flame and pressure of dust explosions in interconnected plants handling combustible dust or powder and the influencing factors were investigated by the large scale experimental equipments. The test configuration consists of two vessels with different volume interconnected by a pipe. The explosion transmitted from one vessel into the other vessel through the connecting pipe. Dust explosions tests were conducted under different level of pre-ignition turbulence and signal of flame and pressure were measured at different locations. The experimental results showed that the explosive severity enhanced and the propagating velocity of flame and pressure wave increased with increasing pre-ignition turbulence intensity. It was proven that pre-ignition turbulence was a dominant factor in affecting dust explosions and this influencing factor should be considered in safety protection and design for dust explosions hazard.