泄爆导管长度对除尘器泄爆影响的模拟分析

使用FLACS软件DESC模块,对连接不同长度泄爆导管的除尘器泄爆模型进行了模拟,研究泄爆过程中除尘器内部以及泄爆方向上的超压与高温变化规律。研究结果表明,泄爆导管内部要比除尘器内部先达到最大爆炸压力,但压力值却要小于除尘器内的超压;在泄爆方向上,距泄爆口越远,导管内的爆炸压力也越小,且在泄爆导管末端压力下降的趋势明显加快;随着导管长度从1 m增加到6 m,除尘器与泄爆导管内部的最大爆炸压力也逐渐增大,在泄爆导管长6 m时,除尘器内部达到了81.8 kPa的最大爆炸压力;而对于不同长度的导管泄爆模型,泄爆导管内部都达到了2 000 K左右的高温,且导管越长,最大爆炸温度所能持续的时间也越长。

Simulated Analysis of Effect of the Length of Vent Duct on the Vented Explosion of Bag Filter

Using the FLACS software DESC module, the vented explosion model of the bag filter connected with different lengths of the vent duct was simulated. Overpressure and temperature changes in the bag filter and in the direction of pressure relief were studied. Simulation results reveal that the inside of the vent duct reaches the maximum explosion pressure first than the inside of the bag filter, but the pressure value is smaller than the overpressure in the bag filter. In the direction of pressure relief, the farther away from the venting port, the smaller the explosion pressure in the vent duct, and the tendency of the pressure drop at the end of the vent duct is significantly accelerated. As the length of the vent duct increases from 1 m to 6 m, the maximum explosion pressure inside the bag filter and the vent duct is gradually increased. When the vent duct is 6 m long, the inside of the bag filter reaches a maximum explosion pressure of 81.8 kPa. For different lengths of the ducted venting model, the inside of the vent duct has reached a high temperature of about 2 000 K, and the longer the vent duct, the maximum explosion temperature inside the vent duct will last longer.