Abstract:

Recently, Zhundong coal with gaint reserves has been proved in Zhundong coalfield. The oxy-fuel combustion technology is considered to be one of the most promising CO₂ capture technologies. Therefore, the study of oxy-fuel combustion technology for Zhundong coal has an important significance on the large-scale, highly efficient, clean and safe use of Chinese coal. However, at present the influence of O₂/CO₂ atmosphere on the melting behavior and microscopic physicochemical properties of Zhungdong coal ash was barely reported. Thus, some research were carried out on the Zhundong coal including measuring the ash fusion temperatures with an ash melting point devise in controlled atmosphere, and analyzing the microscopic physicochemical properties using an analytical scanning electron microscope matched with an energy dispersive spectrometer. The experimental results showed that the influence of the change among air atmosphere, CO₂ atmosphere and O₂/CO₂ atmosphere upon the melting temperature of Zhundong coal ash can be negligible, but the change did give definitive effect on the microscopic physicochemical properties to some extent. Oxy-fuel atmosphere mainly affected the distribution of Ba, Na and Ca elements on the surface of ash, while O₂ content was the primary factor of the micro-morphology of Zhundong coal ash.

Key words: CO₂ capture, Zhundong coal, softening temperature, oxy-fuel atmosphere, SEM

摘要：

近年在新疆准东地区探明了储量巨大的准东煤，而O₂/CO₂燃烧技术被认为是最有前景的碳捕集技术之一，因此研究准东煤的O₂/CO₂燃烧技术对中国煤炭的大规模高效清洁安全利用具有重要意义。然而目前鲜有O₂/CO₂气氛对准东煤灰熔融行为和微观理化特性影响的相关研究。因此针对准东煤，利用灰熔点测定仪、SEM-EDS分析开展相关研究。实验结果表明：空气气氛、CO₂气氛及O₂/CO₂气氛的转变对准东煤灰熔融温度的影响可以忽略不计，但会在一定程度上改变煤灰的微观理化特性。O₂/CO₂气氛主要影响到煤灰表面Ba、Na和Ca元素的分布，而O₂浓度是影响准东煤灰表面微观形貌的主要因素。

关键词: 二氧化碳捕集, 准东煤, 软化温度, 富氧气氛, SEM