【作者】 张海飞；

【导师】 张薇；

【作者基本信息】 南京工业大学 ， 材料学， 2005， 硕士

【摘要】 随着科学技术的发展和能源消费的剧增，天然化石能源越来越紧缺。煤作为我国主要的一次能源，合理的开发、使用，并降低其对环境的污染，是我们应用基础研究面临的重要任务。 煤是由多种矿物质和有机质组成的混合物，煤的燃烧过程包括挥发份和固定碳的燃烧。挥发份是由多种碳氢化合物组成，由于其燃烧机理复杂，反应时间迅速，所以煤燃烧过程的研究工作大多围绕碳的燃烧进行，对挥发份燃烧机理研究的很少。 本文采用管式反应器，以八种煤粉为基本研究对象，对挥发份燃烧的试验过程进行了初步尝试。重点研究了在600℃～800℃这一温度区间，不同煤种、不同粒径及不同温度下的挥发份燃烧反应动力学规律，通过对不同测试方法的分析比较，选择了用气相色谱分析方法对煤的挥发份燃烧产物进行测试，通过以上试验和对试验数据的处理，得到了比较理想的结果，并结合试验研究结果，对反应机理进行了分析。 由研究可见，在管式反应器的试验条件下，挥发份燃烧时CO₂的生成量远小于CO的生成量，在温度较低时，更为明显。不同煤种挥发份燃烧时产物中CO₂和CO的差异很明显，产物中CO₂浓度高的煤种，相应的CO也高。反应温度对燃烧时产物中CO₂和CO的含量影响很大，对高挥发份的煤，随温度的升高，CO₂的生成量增加，且出峰时间提前，但温度达到750℃以后，CO₂的峰值不再增加，750℃时的峰值甚至降低，但出峰时间明显提前。粒度对燃烧时产物中CO₂和CO的浓度影响也很大，粒度越大，不管是CO₂，还是CO的生成速率，都明显下降。曲线上出峰的时间明显滞后，且随粒度的变大有增大的趋势。在600℃的低温下，挥发份反应的结束点并不能从曲线上反映的很清晰，说明在低温下，反应速度较低，在800℃的曲线上，能够分辨出在这样的管式反应器里，挥发份燃烧时间上大约在几秒到十几秒。此外，不同取样点上CO含量随时间的变化很大，说明CO在随气流流动的过程中仍然继续反应。 本文对挥发份在试验温度下的反应机理进行了分析，认为在较低的温度下，更多还原

【Abstract】 With the science and technology development and energy consumption sharp increase, the natural fossil energy is more and more scarce. As our country main energy resource, rational development and use of coal, and reducing it to the environment pollution, is important task which our basic research for application faces. The coal is the mixture which is composed by the many kinds of mineral substance and the organic matter, the coal combustion process including the volatile and coke combustion. The volatile is composed by the many kinds of hydrocarbons, because of its combustion complex mechanism, reaction time rapid, the coal combustion process research mostly revolves the carbon combustion to carry on. Study of volatile combustion mechanism is very few.In this article, take eight kind of pulverized coal in the tubular reactor as the fundamental research object, as volatile combustion the testing to carry on the preliminary attempt. There are study with emphasis in 600 ℃⁸00℃ this temperature sector, the different coal plants, under the different particle size and the different temperature volatile combustion reaction dynamics rule, through to the different test method analysis comparison, chose has carried on the test with the gas chromatography analysis method to the coal volatile combustion product, through above experiment and to tentative data processing, obtained the quite ideal result, and the union experimental study result, has carried on the analysis to the reaction mechanism.By research obviously, under tubular reactor test condition of volatile combustion, CO₂ production quantity far is smaller than the CO production quantity, it’s more obvious for low temperature. For different coal, CO₂ and CO difference is very obvious in outcomes of volatile combustion. If CO₂ density is high, CO is also high. Reaction temperature influences CO₂ and the CO content in outcome of combustion very much. For the high volatile coal, along with temperature elevating, CO₂ production quantity increases, also peak time advance, but after temperature achieved 750℃, the CO₂ peak value no longer increases, 750 ℃ peak value even reduces, but peak time obviously is ahead of time. Granularity influences product CO₂ and the CO density also very big, Granularity is bigger, CO₂ and CO production speed all obviously drops. The peak time obviously lags in the curve, also the tendency has increases along with the granularity. Under low temperatures as 600 ℃, volatile更多还原