低浓度可燃废气处理系统流动特性研究

摘要

The flow characteristics of low concentration combustible waste gas processing system was experimentally studied on a self-built test apparatus.The effects of packing modes,cycle time,gas flow rate and feed gas concentration on gas flow characteristics in hot and cold state were analyzed.The results show that:the resistance loss of gas flow presents obvious periodicity under cold and hot conditions;mixed-packing honeycomb ceramics and catalyst improves the com-bustion stability of the system;with an increase in gas flow rate,the relationship of gas flow re-sistance and velocity gradually transitions from linearity to a parabola;the gas flow resistance un-der hot condition is greater than that under cold condition,and it rises with the increase of cycle time and feed gas concentration.Moreover,on the basis of present experimental data,the gas flow resistance under cold condition is regressed with the form of the Ergun equation,which will be helpful for numerical simulation of the system.%在自建的低浓度可燃废气处理系统上进行了装填方式、循环周期、气体流速和浓度对系统冷、热态气体流动特性影响的研究。结果表明，系统冷、热态气体流动时的阻力损失均表现出明显的周期性；混合装填蓄热体与催化剂更有利于系统的稳定燃烧；随着气体流速的增加，气体流动阻力和流速的关系逐渐从线性关系过渡为近抛物线关系；热态时系统的气体流动阻力大于冷态，并且受循环周期、浓度对系统温度的影响，在1/2周期内呈单调上升趋势。根据试验结果对仅装填蓄热体时系统的冷态流动阻力损失按照Ergun方程的形式进行回归，其结果与试验结果吻合，为后续的数值模拟奠定了基础。