高炉喷吹煤粉混加冶金油泥的燃烧性能

 将冶金油泥与煤粉混合用于高炉喷吹可实现油泥资源化利用,提高煤粉燃烧效率。通过TG-MS研究了高炉喷吹煤粉添加污泥后的燃烧特性与气体释放特征,探究油泥有机组分和无机组分对高炉喷吹煤粉燃烧过程的影响。多种检测手段系统考察了油泥的理化性质,并通过TG-MS研究了高炉喷吹煤粉添加污泥后的燃烧特性与气体释放特征。结果表明,油泥组成主要为润滑油等有机物和以Fe₂O₃为主要成分的无机物,其粒度主要集中在0.7~3 μm,孔隙发达且多为介孔。添加油泥可以降低煤粉的着火温度和最大燃烧速率对应的温度,从而改善反应性,同时提高燃烧过程的放热量,使燃料燃烧更加充分,但当油泥添加量过大时,对煤粉燃烧热量影响较低。动力学研究发现,油泥的添加会降低煤粉燃烧反应的活化能,从而使煤粉燃烧更易进行。

Combustion performance of blast furnace pulverized coal mixed with metallurgical sludge

Mixing metallurgical sludge with pulverized coal for blast furnace injection can realize the utilization of sludge resources and improve the combustion efficiency of pulverized coal. The combustion characteristics and gas release characteristics of blast furnace pulverized coal added with sludge were studied by TG-MS to explore the influence of the organic and inorganic components of sludge on the combustion process of blast furnace injection of pulverized coal. The physical and chemical properties of sludge were systematically examined by various detection methods. The combustion characteristics and gas release characteristics of blast furnace pulverized coal added with sludge were studied by TG-MS. The results showed that the composition of sludge is mainly organic substances such as lubricating oil and inorganic substances with Fe₂O₃ as the main component, which particle size is mainly concentrated in 0.7-3 μm.Its pores are developed and mainly concentrated in mesopores. Adding sludge can reduce the ignition temperature of pulverized coal and the temperature corresponding to the maximum combustion rate to improve the reactivity. In addition, it also can increase the heat generation of the combustion process and make the fuel burn more fully. However, when the amount of sludge added is too large, the effect on the combustion heat of pulverized coal is low. Kinetic studies have found that the addition of sludge could reduce the activation energy of the pulverized coal combustion reaction and make pulverized coal combustion easier.