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采用热重分析及量热仪分析了褐煤与传统喷吹用无烟煤燃烧性及发热值的差异,并采用长管式煤粉爆炸性测定装置研究了粒度对褐煤爆炸性的影响。同时针对混煤中褐煤的适宜配加比例,研究了褐煤添加量与混煤的爆炸性和燃烧性的相关性。结果表明,褐煤粒度小于0.087mm后呈强爆炸性。但褐煤与无烟煤混合能够有效抑制爆炸性,当混合样品中褐煤的质量分数低于40%时混煤没有爆炸性。褐煤的燃烧性好于无烟煤,二者混合后随褐煤比例的增加,混煤的失重曲线出现双特征峰,提高褐煤掺混比能够改善混煤的燃烧性。综合以上研究结果表明,褐煤用于高炉喷吹时的比例控制在40%(质量分数)以下为宜。
The difference of combustion and heating value between lignite and conventional injection anthracite coal was analyzed by thermogravimetric analysis and calorimeter. The effect of particle size on lignite explosive was also studied by long-tube pulverized coal explosive device. In the meantime, according to the suitable ratio of lignite in the mixed coal, the correlation between the amount of lignite and the explosiveness and combustibility of the mixed coal was studied. The results show that the brown coal particle size is less than 0.087mm after a strong explosive. However, the mixture of lignite and anthracite can effectively inhibit the explosiveness. When the mass fraction of lignite in the mixed sample is less than 40%, the mixed coal is not explosive. The combustion of lignite is better than that of anthracite. When the mixture of the two is increased, the proportion of lignite increases, and the two characteristic peaks appear in the weight loss curve of the mixed coal. Improving the blending ratio of lignite can improve the combustibility of the blended coal. Based on the above research results show that the proportion of lignite for blast furnace injection control at 40% (mass fraction) is appropriate.