论文部分内容阅读
选取典型烟煤(PDS)及其分离出的含有机结合态金属较多的中密度(MD)煤样,在沉降炉中进行煤粉热解和燃烧收取颗粒物的试验,研究了热解过程中释放的有机结合态金属对典型烟煤燃烧生成的PM0.1中元素成分的影响.结果表明:1.5μm以下热解颗粒中无机元素成分分布与燃烧生成的PM0.1中元素较接近,显示出有机结合态金属分解对PM0.1的贡献;SEM-EDS分析表明,热解颗粒主要由碳质和挥发性金属组成,粒径略大时,挥发性金属含量降低;PDS原煤与其MD煤样相比,Ca、Fe在其内在矿和外在矿的分布形式和含量的不同导致了其在热解颗粒和PM0.1中含量不同;对于含有机结合态金属较多的MD煤样,在温度较低时,PM0.1多由有机结合态金属分解、气化生成,在温度较高时,难熔元素的气化对PM0.1的贡献有所增加.
In this paper, the typical bituminous coal (PDS) and its medium-density (MD) coal samples containing more organically bound metals were selected to test the pulverized coal pyrolysis and combustion in a settling furnace. Of organic-binding metal on the elemental composition of PM0.1 produced by the combustion of a typical bituminous coal was studied.The results show that the distribution of inorganic elements in the pyrolytic particles below 1.5μm is closer to that of PM0.1 generated by combustion, showing the organic combination The results of SEM-EDS showed that the pyrolytic particles mainly consisted of carbonaceous and volatile metals, and the content of volatile metals decreased when the particle size was slightly larger. Compared with the MD coal samples, The differences of Ca, Fe distribution and contents in the inner and outer mines lead to different contents of pyrolytic particles and PM0.1. For MD coal samples containing more organic metals, PM0.1 was mostly decomposed and gasified by the organic bound metal. At higher temperatures, the contribution of gasification of refractory elements to PM0.1 increased.