低阶煤低温热解半焦在模拟高炉喷吹条件下的燃烧性能

采用自制固定床热解装置在隔绝空气的条件下制备神木长焰煤热解终温分别为400℃、450℃、500℃及550℃的热解半焦，利用管式沉降炉模拟高炉喷吹条件研究神木长焰煤低温热解半焦的燃烧性能，并考察了热解终温、半焦喷吹粒径以及燃烧反应温度对半焦燃烧性能的影响。研究表明：低温热解半焦的燃烧性能优于实验所选用无烟煤的燃烧性能，半焦的燃烧性能与其燃料比之间存在负相关关系，即燃料比越高，燃烧性能越差；降低热解终温、减小半焦喷吹粒径以及提高燃烧反应温度均能改善半焦的燃烧性能，当热解终温为400℃、喷吹粒径100～200目、燃烧反应温度为1100℃时半焦的燃尽度最佳为96%。本实验半焦制备及燃烧条件与现有低温热解和高炉喷吹工艺相符，且热解半焦各项性能均符合喷吹用煤指标。

Experimental investigation of combustion behavior of low rank coal char under simulated blast furnace conditions

Shenmu long-flame coal chars were prepared at carbonization temperature 400℃，450℃，500℃，550℃ respectively using fixed bed pyrolysis apparatus under isolated condition. Reaction of pulverized coal injection（PCI）in a blast furnace was simulated using a drop tube furnace （DTF） to investigate the burnout behavior of low rank coal char and the influence of final pyrolysis temperature，particle size，combustion reaction temperature on combustion behavior. Char combustion behavior was better than anthracite selected in this test，and there was a negative relationship between char combustion behavior and fuel ratio. The higher the fuel ratio，the worse the combustion behavior. Decreasing final pyrolysis temperature and particle size，increasing combustion reaction temperature could improve char combustion behavior. When final pyrolysis temperature was 400℃，particle size was 100—200 mesh，combustion reaction temperature was 1100℃，burnout of coal char was 96%. Preparation and combustion conditions of coal char were similar to existing low temperature pyrolysis and blast furnace injection process，and performance of char met the requirements of blast furnace injection coal.