为了认识内构件煤热解技术生成的主要副产物煤焦的性质，尤其是高温热解的煤焦，采用内构件热解反应器以榆林烟煤为原料于1 000~1 500 ℃真空条件下制备了煤焦，考察了煤焦孔结构、组成、热值、碳结构等理化性质随热解温度的变化规律，采用微型流化床反应分析仪研究了不同煤焦等温燃烧反应特性及动力学参数。结果表明，随着热解温度的增加，煤焦碳含量增加，氢和氧含量降低，C/H摩尔比升高，热值小幅度增加；煤焦比表面积和孔容先降低，但热解温度高于1 300 ℃后基本保持不变，石墨化程度与之变化趋势一致。煤焦燃烧过程可用三维扩散模型G（x）＝［1 -（1 - x）^1/2］²描述，活化能和指前因子随热解温度的增加而升高，分别在30.49 ~ 90.17 kJ/mol和0.69 ~ 352.25 s^-1范围内变化，热解温度高于1 400 ℃后煤焦反应性大幅降低主要源于C/H的急剧增加。

In order to understand the properties of char which is the main byproduct of coal pyrolysis in the reactor with internals, especially the char prepared at high temperatures, the char samples were prepared by pyrolysis of Yulin bituminous coal under vacuum condition between 1 000 ℃ and 1 500 ℃ in the fixed-bed reactor with internals. The variations of pore structure, composition, calorific value, and carbon structure of chars with pyrolysis temperature were studied. The isothermal combustion characteristic and kinetics were investigated by MFBRA(micro fluidized bed reaction analyzer). The results show that the increase in pyrolysis temperature leads to a deeper degree of pyrolysis. As the pyrolysis temperature increases, the C content and C/H molar ratio of chars gradually increase, H and O contents of chars gradually decreases, and the calorific value increases slightly. The specific surface area and pore volume of chars firstly decrease with the increase of pyrolysis temperature, and then remain essentially constant after the pyrolysis temperature exceeds 1 300 ℃, which is consistent with the trend of graphitization degree. The three-dimensional diffusion model G(x) = [1 - (1-x)^1/2]² can well describe the combustion process of chars. The activation energy and pre-exponential factor increase with the increase of pyrolysis temperature, and vary in the range of 30.49 ~ 90.17 kJ/mol and 0.69 ~ 352.25 s^-1, respectively. The significant decrease in combustion reactivity of char prepared above 1400 ℃ is mainly due to the sharp increase of C/H.