灰熔点调控方式对煤灰矿物质转化过程的影响
发布时间：2018-12-31 11:22
【摘要】：煤炭依旧会是我国未来的支柱能源,煤炭的利用离不开煤灰熔融特性的研究。在电站锅炉中,为减少锅炉结渣,通常要求入炉煤具有较高的灰熔点。而在煤气化领域,采用液态排渣的气流床气化炉为顺利排渣,对煤灰的高温粘度特性有严格的限制,一般都要求较低的灰熔点。为满足不同行业的实际需求,需要采用多种调控手段调节煤灰熔点。 本文选用目前储量较大,应用广泛的准东煤和准格尔煤为研究对象,测试了不同比例的配煤后煤灰的熔融特性变化,灰样熔点随准格尔煤比例的升高呈现先降低后升高的特点。结合X射线衍射技术和FactSage模拟计算,分析煤灰中矿物转化过程,从微观机理上解释了引起一系列煤灰熔点变化的原因。并发现了几组重要的低温共熔体,正是这些低温共熔体的形成与共熔导致了煤灰在升温过程中液相的生成,组成低温共熔体矿物含量的不同会导致这些矿物不同程度的熔融,并对其他的矿物质产生一系列影响。 针对目前普遍存在的基于化学元素组成来指导灰熔点调控的现象,本文通过配煤和加入添加剂合成出几种元素组成相同的煤灰,并研究它们的熔融特点。发现这几种煤灰的灰熔点存在较大的差异,并进一步利用XRD和SEM-EDX结合的方式对不同温度阶段的灰样进行实验分析。结果表明：决定煤灰高温时矿物组成的因素除了煤灰元素组成还有这些元素最初在煤灰中的赋存状态,即单纯的依据元素组成来预测灰熔点指导灰熔点调控是不准确的,并对以后灰熔点预测模型的搭建提出合理的建议。
[Abstract]:Coal will still be the pillar energy of our country in the future. The utilization of coal can not be separated from the study of coal ash fusion characteristics. In order to reduce boiler slagging, high ash melting point is usually required in boiler. In the field of coal gasification, the gas-bed gasifier with liquid slagging is used to discharge slag smoothly, which has strict limits on the viscosity of coal ash at high temperature, and generally requires a lower ash melting point. In order to meet the actual needs of different industries, a variety of control measures are needed to adjust the coal ash melting point. In this paper, the large reserves and widely used Jindong and Zhungeer coals are chosen as the research objects, and the melting characteristics of coal ash after different proportions of coal blending are tested. The melting point of ash samples decreases first and then increases with the increase of Zhungel coal ratio. Combined with X-ray diffraction technique and FactSage simulation calculation, the process of mineral transformation in coal ash is analyzed, and the causes of a series of coal ash melting point changes are explained from the microscopic mechanism. Several important groups of low temperature eutectic have been found. It is the formation and eutectic of these low temperature comelts that lead to the formation of liquid phase during the heating process of coal ash, and the different mineral content of composition low temperature eutectic will lead to different degrees of melting of these minerals. And has a series of effects on other minerals. In view of the phenomenon that chemical element composition is widely used to guide ash melting point control, coal blending and additives are used to synthesize coal ash with the same composition, and their melting characteristics are studied. It is found that there are great differences in ash melting points among the three kinds of coal ash, and the ash samples at different temperatures are further analyzed by XRD and SEM-EDX. The results show that the factors that determine the mineral composition of coal ash at high temperature are not only the composition of coal ash elements, but also the initial occurrence of these elements in the coal ash, that is, it is not accurate to predict the ash melting point to guide the regulation of ash melting point simply according to the composition of the elements. Some reasonable suggestions are put forward for the prediction model of ash melting point in the future.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD849
本文编号：2396499
[Abstract]:Coal will still be the pillar energy of our country in the future. The utilization of coal can not be separated from the study of coal ash fusion characteristics. In order to reduce boiler slagging, high ash melting point is usually required in boiler. In the field of coal gasification, the gas-bed gasifier with liquid slagging is used to discharge slag smoothly, which has strict limits on the viscosity of coal ash at high temperature, and generally requires a lower ash melting point. In order to meet the actual needs of different industries, a variety of control measures are needed to adjust the coal ash melting point. In this paper, the large reserves and widely used Jindong and Zhungeer coals are chosen as the research objects, and the melting characteristics of coal ash after different proportions of coal blending are tested. The melting point of ash samples decreases first and then increases with the increase of Zhungel coal ratio. Combined with X-ray diffraction technique and FactSage simulation calculation, the process of mineral transformation in coal ash is analyzed, and the causes of a series of coal ash melting point changes are explained from the microscopic mechanism. Several important groups of low temperature eutectic have been found. It is the formation and eutectic of these low temperature comelts that lead to the formation of liquid phase during the heating process of coal ash, and the different mineral content of composition low temperature eutectic will lead to different degrees of melting of these minerals. And has a series of effects on other minerals. In view of the phenomenon that chemical element composition is widely used to guide ash melting point control, coal blending and additives are used to synthesize coal ash with the same composition, and their melting characteristics are studied. It is found that there are great differences in ash melting points among the three kinds of coal ash, and the ash samples at different temperatures are further analyzed by XRD and SEM-EDX. The results show that the factors that determine the mineral composition of coal ash at high temperature are not only the composition of coal ash elements, but also the initial occurrence of these elements in the coal ash, that is, it is not accurate to predict the ash melting point to guide the regulation of ash melting point simply according to the composition of the elements. Some reasonable suggestions are put forward for the prediction model of ash melting point in the future.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD849
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