高炉喷吹煤配加供料系统除尘灰可行性分析

除尘灰的合理利用一直是钢铁厂面临的问题之一,近年来国内重点钢铁企业都在将干熄焦除尘灰配入喷吹煤中进行高炉喷吹,实现了除尘灰的资源化利用。为了明悉不同除尘灰进行高炉喷吹时工艺性能的区别,提升高炉消纳除尘灰的能力,对首钢京唐公司所产干熄焦除尘灰CC9、供料系统除尘灰C8和CCJ1及其与煤粉混合喷吹的可行性进行分析,并根据研究结果在首钢京唐3号高炉进行工业试验。研究结果表明,3种除尘灰均具有高固定碳含量和低的挥发分,燃烧性能比高炉喷吹煤粉差,在配加比例不超过5%情况下,干熄焦除尘灰CC9混煤与供料系统除尘灰C8以及CCJ1混煤燃烧曲线接近,供料系统除尘灰可以配加到煤粉中进行高炉喷吹。从工业试验结果来看,配加5%供料系统除尘灰对高炉喷吹煤粒度、除尘灰成分以及高炉炉况和燃料消耗均不会造成较大影响,可以替代干熄焦除尘灰,弥补除尘灰高炉喷吹资源缺口。

Feasibility analysis on adding bag dust of material feeding system to coal injected into blast furnace

The rational use of bag dust has always been one of the problems faced by iron and steel plants. Metallurgical companies in China mix coke dry quenching(CDQ) dust into injection coal for blast furnace in recent years, realizing the resourceful use of bag dust. In order to clarify the difference of technological performance for different bag dust in blast furnace injection and improve the absorbing ability of bag dust in blast furnace, the feasibility for blast furnace injection of CDQ dust CC9 and bag dust of material feeding system C8 and CCJ1, which were produced by Shougang Jingtang Company, and their mixed samples with blast furnace pulverized coal were analyzed, and industrial tests in Shougang Jingtang No.3 blast furnace were carried out according to the research results. The results show that the three kinds of bag dust all have high fixed carbon content and low volatile matter, and the combustion performance is worse than that of blast furnace pulverized coal injection. When the mixing ratio does not exceed 5%, the combustion curves of CC9, C8 and CCJ1 bag dust are approaching, the bag dust of material feeding system can be added to the pulverized coal for blast furnace injection production. From the results of industrial tests, the addition of 5% material feeding system bag dust will not have great impact on the blast furnace injection coal particle size, bag dust composition, blast furnace conditions and fuel consumption. It can replace the CDQ dust and make up the blast furnace blown resource gap of bag dust.