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该文主要对生物质热解过程中焦炭物化结构的演变特性与转化机理进行分析研究。在固定床反应器上,以棕榈壳为样品,热解终温从300~1000℃下制得焦炭,采用比表面积和孔径分析仪与傅里叶红外光谱仪等用对不同温度下所得焦炭的物化结构进行深入分析。研究发现煤焦的表面孔隙结构的形成和丰富主要集中在400~600℃,随着碳化温度的升高,孔面积先增大后减小,在约600℃有较高的比表面积;棕榈壳焦内的有机官能团(C=O,C—C,C—H,C—O和OH等)的断裂和缩合也主要发生在中低温度段,同时固体焦内,碳的含量逐渐增加,而氢元素的含量逐渐减少。
This paper mainly analyzes the evolution characteristics and transformation mechanism of coke physical structure in biomass pyrolysis process. In the fixed bed reactor, palm shell as a sample, the pyrolysis final temperature from 300 ~ 1000 ℃ coke obtained by the use of surface area and pore size analyzer and Fourier transform infrared spectroscopy with different temperature of the coke obtained materialization Structure in-depth analysis. It was found that the formation and enrichment of surface pore structure of coal char mainly concentrated in the range of 400-600 ℃. With the increase of carbonization temperature, the pore area first increased and then decreased, with a higher specific surface area at about 600 ℃. The rupture and condensation of organic functional groups (C = O, C-C, C-H, C-O and OH etc.) in the coke also mainly occur in the middle and low temperature range, while the content of carbon in the solid coke increases gradually, Hydrogen content gradually decreased.