首钢2号高炉混煤喷吹研究

Research of Mixed Coal Injection on Shougang No.2 BF

分析了实验室条件下风温、不同烟煤混合比例、煤粉粒度对混煤燃烧特性的影响,得出喷吹AB混煤的煤粉粒度可控制在粒度小于0.074mm的比例不小于30%,粒度大于0.175mm的比例不大于25%;风温每提高38℃,煤粉燃烧率提高1个百分点;高炉喷吹AB混煤中烟煤(B煤)的比例宜在30%～50%。在2号高炉进行了混煤喷吹的工业试验,试验期间,风温、煤比提高,焦比降低;试验表明:首钢四制粉能够喷吹挥发分小于18%的混煤;最终提出了进一步进行工业试验的方向。

The effect of blast temperature, the coal size on the mixed coal combustion rate in experiment condition was analyzed. And then the conclusion was drawn that the proportion of minus 0074 mm mixed coal powder should be over than 30% and the proportion of 0175 mm mixed coal should be less than 25%; and the coal combustion rate can be increased by 1% with blast temperature increment of 38 ℃. The proportion of bituminous coal in mixed coal for injection is in a range of 30%-50%. The industrial exam of mixed coal injection has been performed with the increase of the blast temperature and PCI rate and decrease of coke rate; it was proved that Shougang forth milling system is able to inject mixed coal with a volatile less than 18%. The future industrial exam is proposed.