煤粉性状对残炭颗粒微结构及其燃烧特性的影响

INFLUENCE OF PULVERIZED COAL CHARACTER ON THE MICROSTRUCTURE AND COMBUSTION SPECIALITY OF CHAR PARTICLES

本文研究了不同粒度的烟煤和无烟煤经高温气流燃烧后残炭颗粒的形态及孔隙结构，对其燃烧方式和燃尽特性进行了讨论，并比较了两种煤的差别。结果表明，由镜质组形成的球形残炭表面和内部同时燃烧，容易燃尽；而由惰性组形成的不规则残炭以外部反应为主，较难燃尽。同无烟煤相比，烟煤残炭孔隙多，燃烧剧烈，且孔穴内部燃烧所占比重更大。

Morphology and hole structure of char particles of different size bitu-minous coal and anthracite after combustion at high ternperature air flow were inves-tigated and their combustion mode and speciality were discussed and the difference of the two kinds of coal was compared.The resuIts show that the spherical char partL cles evolved from vitrinite were burned easilv at the same tirne on the surface and in the hole;howerer,irregular char conibustion takes place mainly on the surface but it burned difficuItly. Compared with anthracite,the char of bituminous coal has rnore holes and its combustion is strong with higher proportion in the holes。