中文摘要：

本文针对煤粉燃烧SCT模型中的氧气可达比表面积，进行了不同煤种的TG实验和N2/BET比表面积的测试，研究了煤粉燃烧过程中不同温度下比表面积在不同孔径下与燃尽度和燃烧速率的相关性，研究表明：煤粉在燃烧过程中的平均孔径大于3～11 nm时，该孔径以上的累积比表面积与燃尽度有很好的相关性;高阶煤的氧气可达比表面积在反应过程中逐渐增加，而低阶煤的氧气可达比表面积在反应过程中的变化不是很显著;通过大量的实验说明，不是所有的比表面积在反应过程中都发挥作用，而氧气可达比表面积可以很好地反映燃烧速率的变化。

英文摘要：

This paper aimed at oxygen-accessible specific surface area（OASSA） in the kinetic model SCT during pulverized coal char combustion, with TG experiments and N2/BET specific surface area tests, researches on the correspondence of OASSA with burnout degree and combustion rate （CR） with different diameter pores under different temperature during coal combustion. And it shows that： when the average pore diameter of coal greater than 3-11 nm in combustion, the accumulated specific surface area correlate with burnout degree well above the diameter; the OASSA of highly developed coal increases step by step in the reaction, in contrast, for less developed coal, it changes inapparently; a mount of experiments prove that not all specific surface area take effect in the reaction, but OASSA can respect well on the variation of CR.