流化床燃煤固硫技术作为一种先进的燃烧技术,在实际应用中受到了一定的限制,主要原因是由于流化床燃煤固硫副产物的固硫渣缺乏成熟且经济的综合利用途径。人们对于流化床燃煤固硫渣的认识程度还比较有限,基础资料十分缺乏,这对于燃煤固硫渣的资源化利用造成了一定影响。本论文系统分析了流化床燃煤固硫渣的特性,并提出了一套新的活性评定方法。通过对燃煤固硫渣活性的影响因素、激发方法和体积膨胀性能进行了较为系统的试验研究,运用XRD、SEM等微观手段研究了燃煤固硫渣的自硬性、活性激发及膨胀机理。最后本论文对燃煤固硫渣的建材资源化利用进行了深入研究。
关键词:流化床、燃煤固硫渣、活性、膨胀、资源化
Abstract
The technology of fluidized bed combustion with sulfur retention on coal is an advanced combustion technology. However, its widespread application is severely restricted due to the lack of mature and economically feasible comprehensive utilization pathways for bottom ashes of circulating fluidized bed. The limited understanding of fluidized bed coal combustion by-products has led to a scarcity of basic data, which has to some extent hindered the resource utilization of bottom ashes. This thesis systematically analyzes the characteristics of bottom ashes from circulating fluidized bed combustion, and proposes a new set of methods for assessing their reactivity based on current standards. Building on this, a comprehensive experimental study was conducted on the factors affecting the reactivity of coal combustion solidified sulfur residues, as well as the methods of excitation and volumetric expansion performance. Using microscale techniques such as XRD and SEM, the autogenous properties, reactivity excitations, and expansion mechanisms of coal combustion solidified sulfur residues were investigated. Finally, a thorough study was conducted on the resource utilization of coal combustion solidified sulfur residues for building materials.
Keywords: Fluidized bed, coal combustion solidified sulfur residue, reactivity, expansion, resource utilization