风量对烧结烟气成分影响的实验研究

Experimental study of the ventilation volume's influence on the composition of sintering flue gas

通过对工业冶金烧结过程进行简化,建立了小型固定型的热态烧结试验台,考察了风量对烧结烟气中可燃稀薄气体组分(CO、H2和CH4)体积分数变化的影响。研究结果表明:CO和H2体积分数随风量与时间的变化趋势相似,呈现刚开始快速增加后平稳再急速下降的变化,CO与H2体积分数总体变化为随着风量的增大而减小;燃烧比φCO/(φCO+φCO2)在风量为100m3/(m2·min)左右时较低,说明此时碳的化学能利用较高,但考虑风量提高伴随风机电耗的提高和漏风量的增加,烧结风量为90m3/(m2·min)是实验中得出的较优风量;CH4体积分数在各个风量下都呈现先快速增加再平稳到接近烧结终点后体积分数剧烈减小,且在烧结风量为70m3/(m2·min)时最大,最高接近2%(体积分数)。此实验结果为烧结实际生产的风量选择和烟气回收等节能减排项目提供了一定的参考。

To simplify the sintering process,a small scale fixed test bed for thermal sintering was built and the influence of ventilation volume on the contents variation of combustible rarefied gases(CO,H2 and CH4)was investigated.As a result,the CO and H2 content decreased with the augment of ventilation volume as a whole,and the variation trends of both content with ventilation volume and time were alike,which increased rapidly at first and turned to steady then dropped sharply;the relatively lower combustion ratio[φCO/(φCO+φCO2)]at a 100m3/(m2·min)ventilation volume indicated an enhanced efficient utilization of carbon chemical energy.Considering the increase of power consumption and air leakage with the increase of ventilation volume,the optimal ventilation volume in the experiment was 90m3/(m2·min).The CH4 content showed the same trend with various ventilation volume that it increased rapidly and maintained before dropped quickly when close to the burn-through point.The CH4 content reached to the max,approximately 2%,at the 70m3/(m2·min)ventilation volume.The experiment results could provide some reference for energy saving projects such as the choice of ventilation volume in sintering and the recycle of sintering flue gas.