【作者】 朱战岭；

【导师】 谢峻林；

【作者基本信息】 武汉理工大学 ， 材料学， 2007， 硕士

【摘要】 水泥工业生产中使用的主要燃料是煤炭，目前，随着优质烟煤的日益稀少，水泥工业正逐渐向利用劣质燃料的方向发展。以高灰分煤为代表的劣质煤，在水泥生产中的频繁使用必然会影响到熟料煅烧、窑系统工况稳定以及能耗高低等。因此，系统的研究高灰分煤的燃烧特性及其对熟料烧成的影响机理，对于有效利用劣质煤资源和稳定熟料质量具有重要意义。本文结合不同品质高灰分煤，进行了煤的燃烧特性、煤中灰分及固定碳组分对熟料烧成影响的研究，分析了相关的作用规律，从而为合理利用高灰分煤资源提供理论指导。本文通过对不同品质高灰分煤进行热重实验分析表明，高灰分煤的着火点和燃烬时间均升高，而着火指数D_i与燃烬指数D_f降低。挥发份含量相近的煤样，其着火与燃烬特性的变化，并未随灰分含量的改变而存在明确的规律。当煤中灰分含量相近时，煤灰中SiO₂／（Al₂O₃+Fe₂O₃）值偏高的，其着火与燃烬特性降低，尤其当煤灰中Fe₂O₃含量特别高时，其燃烧特性会有很明显的下降。由灰分对熟料烧成过程影响的研究结果表明，随生料中掺入灰分的升高，液相初析温度降低，在稳定率值时，液相初析温度降低36℃，当生料成分不变时，液相初析温度降低64℃，当烧成温度高于1250℃时，液相变化温度转而由生料成分起主导作用。实验表明，随着灰分的升高，C₃S的含量均降低，而C₂S的含量增加，在生料成分不变，掺入的灰分含量较高时，C₂S成为了主要矿物。同时，随灰分的升高，熟料中A矿和B矿的分布均匀性更差，熔蚀现象也更多。本文通过在生料中掺加不同燃烬度煤焦及煤粉的实验，得出随着燃烬度的降低，即固定碳含量的升高，物料液相初析温度均降低，但R＞80％时固定碳对液相的作用已经不明显，同时挥发份对液相变化温度的影响较小。随固定碳含量的增多，生料在1250℃时的易烧性有很大改善，尤其当煤灰中Fe₂O₃含量较高时效果更明显，而挥发份的引入则使得易烧性变差。在1450℃时，固定碳的增多将会使C₃S的形成略有增加，同时熟料矿物的形貌和分布都变的不均匀，晶粒尺寸变大，A矿熔蚀现象更严重，长径比减小，当燃烬度R＞80％时，固定碳的作用基本消失。更多还原

【Abstract】 Coal is the main fuel used in the cement industries. With the reduction of highquality coal, the inferior coal is used more and more now. High-ash coal as therepresentative of inferior coal, it will be used frequently in the cement production.However, the change of the coal quality will be certain influence the clinker burning,quality and the stable of the kiln’s condition. Therefore, Systematic research thecombustion characteristics of high-ash coal and the mechanism of sintering ofportland cement clinker, which have great significance for the effective use of inferiorcoal resources and the stable of clinker quality. In this thesis, considering somedifferent high-ash coal quality, the combustion characteristics of different quality ofhigh-ash coal and influence rules of coal ash and combustible components onsintering of portland cement clinker were studied, aiming to provide theoreticalguidance for the rational use of high ash coal resources.The studying results that thermo-gravimetric analysis of different high ash coalshow that the kindling point and the combustion ending-tilne were increased, and theindex D_i and D_f lower. Volatile content similar to the different coal, ignition andcombustion characteristics, not with the ash content of the changes there are clearrules. When ash content of coal similar, SiO₂/（Al₂O₃+Fe₂O₃） of ash increase, itsignition and combustion characteristics lower, especially when content of Fe₂O₃ in theash particularly high, combustion characteristics there are a significant decrease.The studying results that effects of coal ash on the Sintering of Portland CementClinker show that with increaseing ash content of coal, primary the temperature ofliquid phase of cement raw meal lower. When modulus value of clinker is stabilitated,the temperature of liquid phase reduces 36℃, and when the same raw mealingredients, the temperature of liquid phase reduces 64℃, especially when thesintering temperature above 1250℃, the raw meal ingredients are the main factorswhich influence the temperature of liquid phase. Experiments show that withincreaseing ash content of coal, content of C₃S declined while the content of C₂Sincreased. When the raw meal ingredients unchanged, the introduction of high ashcontent, C₂S become a major mineral. Meanwhile, with increaseing ash content of coal, resulting in more uneven distribution of minerals and more corrosionphenomenon in cement clinker.In this thesis, the experimental study on adding different burnout degree of charand pulverized coal show: with increaseing fixed carbon content, reducing burnoutdegree of char, primary the temperature of liquid phase of cement raw meal lower.But when extent of burning char R>80%, carbon to the liquid phase has little effect,meanwhile volatile matter content has little effect on the temperature of liquid phase.With increaseing fixed carbon content, burnability of raw mixes have greatly improvein the 1250℃, especially when content of Fe₂O₃ in the ash particularly high, contraryto the introduction of the volatile matter content makes burnability lower. When thetemperature rise to 1450℃, along with increaseing fixed carbon content, themorphology and distribution of clinker mineral becomes more uneven and grain sizeincrease, A mine etch phenomenon more serious, aspect ratio decrease. But whenR>80%, fixed carbon has little effect on petrographic structure of Portland cementclinker.更多还原