除尘器内烟草粉尘爆炸规律的数值研究

Numerical Investigation on the Explosion Law of Tobacco Dust in Filter

在工业生产中,除尘器内经常发生爆炸灾害事故,给安全生产带来了严重的挑战。为探究除尘器内发生爆炸时爆炸超压演化及爆炸火焰传播的规律,基于球形爆炸装置对烟草粉尘的实验数据,构建了大规模爆炸仿真软件FLACS的烟草粉尘爆炸模块,进而实现了对带管道除尘器内爆炸及传播过程的数值仿真。模拟结果表明:除尘器内部发生爆炸时,内部的粉尘质量浓度、点火位置、管道形状均对爆炸过程有一定影响。在500~1000 g/m^3范围内,除尘器内粉尘质量浓度越大,爆炸超压越大,火焰传播速度越快;点火位置离管道入口越远,爆炸超压越大,火焰传播速度越快;管道若设置有折弯结构,火焰经过该部分后,可以一定程度上减弱爆炸超压和火焰传播的速度。

In industrial production,explosion disasters often occur in filter,which brings serious challenges to safety production.To explore the explosion overpressure evolution and the propagation law of explosion flames happened in the interior of filter,the tobacco dust explosion module of large-scale explosion simulation software FLACS was constructed,and then the numerical simulation of the explosion and propagation process of the filter with pipeline was realized.The simulation results show that,when an explosion occurs inside the filter,the internal dust concentration,ignition position,and pipe shape all have an impact on the explosion process.In the concentration range of 500 g/m 3 to 1 000 g/m 3,the greater the concentration of dust in the filter,the greater the explosion overpressure,the faster the flame propagation speed;the farther the ignition position is from the inlet of the pipeline,the greater the explosion overpressure,the flame propagation speed is faster;if the pipeline is provided with a bending structure,the flame can pass through this part and the explosion pressure and flame propagation speed can be reduced to a certain extent.