几种氯化物对高炉喷吹用煤粉燃烧性能的影响

为了提高高炉喷吹煤粉的燃烧率,分析了Ca Cl2,Mg Cl2,Na Cl和Fe Cl3添加剂对高炉喷吹用煤粉燃烧性能的影响,得到各物质添加量对煤粉燃烧率的影响规律。结果表明,适量的Ca Cl2,Mg Cl2,Na Cl和Fe Cl3均能改善高炉喷吹用煤的燃烧性能。当Ca Cl2和Mg Cl2添加量小于1%、Fe Cl3添加量小于2%时,煤粉燃烧率分别随Ca Cl2,Mg Cl2和Fe Cl3添加量的增加而提高;继续增加各物质的添加量,煤粉燃烧率均下降;煤粉燃烧率随Na Cl添加量的增加而提高。与原煤燃烧后产生的未燃煤粉相比,加入氯化物添加剂后高炉喷吹用煤的未燃煤粉颗粒均变得不规则,且粒度明显减小。综合考虑,高炉喷吹用煤粉中Ca Cl2和Mg Cl2适宜的添加比例均为1%,Fe Cl3适宜的比例为2%,Na Cl的添加比例应小于1%。为改善高炉喷吹用煤粉的燃烧性能,4种氯化物添加剂优的先选用顺序为Fe Cl3,Ca Cl2,Mg Cl2和Na Cl。

Effect of several chlorides on combustion property of pulverized coal injection in blast furnace

In order to inhance the combustion rate of pulverized coal injection in the blast furnace，the combustion properties of pulverized coal injection in blast furnace were analyzed using chlorides (CaCl2，MgCl2，NaCl and FeCl3) as additives，and the influence of four kinds of chloride on coal combustion rate were obtained.The results show that the proper quantities of CaCl2，MgCl2，FeCl3 and NaCl can improve the combustion properties of pulverized coal injection in blast furnace respectively.When the content of CaCl2 and MgCl2 added is less than 1%，and FeCl3 content is less than 2%，the coal combustion rate improves with the increase of CaCl2，MgCl2 and FeCl3 content respectively;while increasing the additive contents continually，the coal combustion rate will all reduce.The coal combustion rate of pulverization coal injection increases when the content of NaCl added is increased.Compared with unburned pulverization coal produced from raw coal，the grains of unburned pulverization coal from coal with chloride additives become irregularity，and the particle size also diminish significantly.Generally speaking，the suitable proportion of CaCl2 and MgCl2 are 1% and FeCl3 2% respectively，and NaCl is less than 1%.FeCl3 should be chosen firstly as chloride additive for improving the combustion property of pulverization coal injection，CaCl2 and MgCl2 are the second choice，and NaCl is the last.