煤焦气化过程中比表面积和孔容积变化规律及其影响因素研究

煤焦的孔隙结构是影响气化反应的重要因素之一，本文通过测定部分气化焦样的比表面积及其孔隙结构，详细地研究了烟煤焦的孔隙结构在气化过程中的变化规律及其影响因素，结果表明，煤焦的孔隙结构在气化过程中的变化不但取决于原煤的性质，而且还取决于气化介质与气化温度；在相同条件下气化至相同气化率时总比表面积和孔体积大小顺序为彬县＞神木＞王封煤焦，总比表面积与微孔比表面积均随温度的升高而降低，在反应的前期CO2与H2O两种气氛下产生的总比表面积与微孔比表面积相当，但在反应后期CO2气氛下能够产生更多的总比表面积与微孔比表面积。

STUDY ON STRUCTURAL PROPERTIES AND THEIR AFFECTING FACTORS DURING GASIFICATION OF CHARS

The structural properties of chars are a key aspect to affect the gasification rate This work attempts to study the development of porosity in chars prepared at different conditions by measuring their N 2 adsorption characteristics It is found that the structural properties are affected not only by original char properties, but also by gasification conditions (reactant gas and temperature) The order of the specific surface area and pore volume is Binxian char>Shenmu char>Wangfeng char at the same carbon conversion High gasification temperature would result in lower specific surface area and micropore area The results obtained also show that carbon dioxide produces micropore during whole gasification process; it produces more micropore than steam during high carbon conversion The specific surface area and micropore area of demineralized chars are larger than those of raw coal chars during initial stage, but opposite results are obtained during high carbon conversion