Microstructural changes during anthracite char gasification and its effect on gasification reactivity
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摘要: 在常压、1000℃下，测定了两种不同煤化程度的无烟煤焦和一种脱灰无烟煤焦的水蒸气和CO2的气化反应性。并以N2和CO2为吸附质，测定了原煤焦的孔结构特征;以CO2为吸附质，测定了无烟煤焦在气化过程中微孔结构的变化。考察了矿物质对无烟煤焦孔结构变化的影响。结果表明，水蒸气和CO2对无烟煤焦的气化反应都有微孔的产生和扩展作用。无烟煤焦水蒸气气化反应性与煤焦的微孔比表面积成正比，但无烟煤焦CO2气化反应性与煤焦的微孔比表面积没有依存关系。煤中矿物质对无烟煤焦气化过程中孔结构的变化不产生影响。Abstract: The gasification reactivity of two anthracite chars with different coal rank and one demineralized anthracite char was determined at atmospheric pressure using fixed bed reactor. The microstructural characteristics of the initial anthracite chars were measured using N2 and CO2 as adsorbate. The variations of microstructure during gasification were measured using CO2 as adsorbate. The effect of mineral matter in anthracite on the variation of microstructure was investigated. The results show that both steam and CO2 play a role in opening micropores and enlarging them. The anthracite char steam gasification reactivity is proportional to its microporous surface area. However, there is no correlation exists between anthracite char CO2 gasification reactivity and its microporous surface area. The mineral matter in anthracite has no influence on the variation of microstructure during gasification.
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Key words:
- anthracite char /
- gasification /
- microstructure
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