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1、毕业设计（论文）毕业设计（论文）题 目 MnO2对高炉喷吹无烟煤燃烧特性的影响 摘 要本文主要介绍了高炉喷煤现状、我国煤炭资源概况以及煤粉燃烧特性的相关指标，主要研究分析了 MnO2含量对煤粉燃烧特性的影响。本课题利用热重分析仪综合测定了添加不同比例 MnO2煤粉试样的着火点温度、燃尽温度、燃尽时间、失重率等，根据测出的数据计算出各试样的煤粉和煤焦综合燃烧特性指数。对比分析了各试样的 DTA 曲线，以了解 MnO2含量对煤粉放热性能的影响。以此为依据找出对煤粉具有最佳助燃效果的 MnO2含量。分析结果表明，当 MnO2含量为 3%时，煤粉的综合燃烧特性指数最大，煤粉燃烧放热性能最好；MnO2含
2、量为 3.5%时，能显著降低煤粉的着火点温度，与原煤相比降低了 17.5，此时煤焦的综合燃烧特性指数最大。因此，煤粉中添加的 MnO2含量为3%3.5%时，对煤粉的助燃效果最好。关键词：高炉喷煤 燃烧特性 助燃剂 MnO2ABSTRACTThis paper mainly introduces the present situation of coal powder injection in blast furnace、the coal resources in China and the index relate to combustion characteristic of pulveri
3、zed coal, mainly researched and analysed the effect of the content of MnO2 on the combustion characteristic of pulverized coal. This topic have determined the Fire point、Burning temperature、burning-down period and Weightlessness rate of the samples of pulverized coal that have different proportion o
4、f MnO2 by thermogravimetric analyzer comprehensively. Then calculate every samples comprehensive combustion characteristic index about pulverized coal and coke according to the data that have measured. Analysed every samples DTA curve comparatively, to know the influence of the content of MnO2 in pu
5、lverized coal. At last find out the content of MnO2 to the pulverized coal that have the best burning effect according to the research.As the analysis results show, when the content of MnO2 in the pulverized coal is 3%, that it has the highest comprehensive combustion characteristic index and the Co
6、mbustion heat release performance is the best. When the content of MnO2 in the pulverized coal is 3.5%, it can reduce the fire point temperature of the pulverized coal dramaticlly, that is to say, it has reduced 17.5 compare with the raw coal. And at the same time, the comprehensive combustion chara
7、cteristic index is the highest of the coke. Therefore, when the content of MnO2 in the pulverized coal is 3%3.5%, it has the Best combustion effect.Keywords: spray-blow coal；combustion characteristic；oxidant；MnO2目录摘要.IABSTRACT.II1 绪论.11.1 高炉炼铁及其发展.11.1.1 高炉炼铁的主要燃料.11.1.2 高炉生产中焦炭的作用.11.1.3 煤的焦化.21.1.
8、4 我国炼焦工业出现的问题.21.2 我国煤炭资源概况.21.2.1 我国煤炭资源的储量及其分布.31.2.2 我国煤炭资源的种类.31.2.3 我国煤炭资源的利用现状.31.3 高炉喷煤技术.41.3.1 我国高炉喷煤技术的现状.41.3.2 高炉喷煤技术的发展趋势.51.4 本文的研究内容.52 高炉喷吹煤粉性能的研究现状.62.1 高炉喷煤的常用煤种及要求.62.1.1 喷吹煤粉的密度、堆角及比表面积.62.1.2 煤的可磨性及粒度.62.1.3 煤粉的着火点及灰熔点.62.1.4 煤粉的自燃和爆炸性能.72.2 高炉喷吹煤粉的燃烧过程.82.3 高炉喷煤的传质过程.92.4 高炉煤粉喷吹工艺.93 煤粉的燃烧特性.103.1 热重分析法测定煤粉燃烧特性.
