高温颗粒引燃转炉煤气的实验研究

为分析转炉煤气显热回收过程中被高温颗粒引燃危险性,自行设计了激光辐射加热氧化铁颗粒引燃转炉煤气实验平台.以转炉煤气/空气混合物压力及温度变化为引燃判据,研究不同初始温度及粒径颗粒引燃混合物的规律.结果表明,转炉煤气/空气混合物存在引燃敏感浓度,当受辐射颗粒粒径相同、初始温度为100℃时混合物敏感浓度比35℃时上升了5%;初始温度为35,100,200℃时,粒径1.5 mm的颗粒引燃温度比0.5 mm的分别下降137.6,145及134.5℃;颗粒粒径为0.5,1.0及1.5 mm时,初始温度为200℃时的引燃温度比35℃时分别下降了19.8,11.6及16.7℃.研究结果对高温转炉煤气进入换热器前设置除尘粒径限制具有参考意义.

Experimental Research of the Ignition of ConVerter Gases by Hot Particles

In order to analyze the explosion risk of converter gases in the process of reclaiming， a set of test devices for converter gas ignition by iron oxide particles heated radiatively was set up. The rules of mixture ignition at varied initial temperatures and with particle diameters were investigated， based on the explosion pressure and temperature changes of converter gases/air mixtures. The results showed that when the particle diameters are constant， the sensitive concentrations of converter gases/air mixtures increase by 5% if the initial temperature changes from 100℃ to 35℃. The ignition temperatures of 1.5mm-diameter particles drop by 137.6， 145 and 134.5℃ compared to the 0.5mm-diamete particles when the initial temperature is 35， 100 and 200℃ respectively. When the particle diameters are 0.5mm， 1.0mm and 1.5mm separately， the ignition temperatures decrease by 19.8， 11.6 and 16.7℃ with the initial temperature changing from 200℃ to 35℃. The research findings can provide a reference for limiting hot particle diameters before high temperature converter gases enter heat exchangers.