用于高炉喷吹的低阶煤梯级转化半焦的燃烧性能

 采用固定床热解装置制备神木长焰煤与凤眼莲和冶金工业固体废弃物热解终温分别为450和550 ℃的共热解半焦；利用管式沉降炉模拟高炉喷吹条件研究共热解半焦的燃烧性能，并考察了热解终温和共热解物质对半焦燃烧性能的影响。研究表明：高炉瓦斯泥和冷轧氧化铁红的加入起到催化煤热解的作用，其中高炉瓦斯泥的催化热解效果最优，挥发分析出的增幅为18.4%；煤与冷轧氧化铁红在热解终温550 ℃时共热解半焦的燃烬度最佳为98%，与550 ℃时的原煤半焦的燃烬度相比，提高了22.5%；SEM扫描电镜结果显示，煤与冷轧氧化铁红共热解半焦与原煤半焦相比，半焦表面产生了更多的裂纹；除煤与轧钢氧化铁皮及煤与高炉瓦斯泥共热解半焦外，试验所制备的其他共热解半焦的各项性能均符合中国喷吹用煤指标。

Combustion Behavior of Low Rank Coal Char Application in Blast Furnace Injection

Using fixed bed pyrolysis apparatus preparation of co-pyrolysis coal char of Shenmu long-flame coal and water hyacinth and metallurgical industry wastes at final pyrolysis temperature of 450 and 550 ℃ respectively. Reaction of pulverized coal injection (PCI) in a blast furnace was simulated using a drop tube furnace (DTF) to investigate the burnout behavior of a number of co-pyrolysis coal char and the influence of final pyrolysis temperature and co-pyrolysis material on combustion behavior. The result shows that blast sludge and cold rolling iron oxide could catalytic coal pyrolysis, and blast sludge had the optimal catalytic effect, and the growth of volatile is 18.4%; the optimal burnout of co-pyrolysis coal char was coal and cold rolling iron oxide pyrolysis at final temperature 550 ℃; the burnout degrees increased by 22.5% compared with raw coal char which was prepared at the same final pyrolysis temperature; SEM results show that the coal co-pyrolysis with cold rolling iron oxide produced more crack on char surface; in addition to co-pyrolysis coal char of coal and iron slag of steel rolling and blast sludge, the various performance of co-pyrolysis coal char in this experiment were consistent with the Chinese injection coal indexes.