In situ change of fractal structure in coal with coking capability during high-temperature carbonisation

ABSTRACT

Coal is an important energy and chemical raw material. Carbonization is an effective way for comprehensive utilization of coal, especially for coal with coking capability. The complex pore structure of raw coal and its carbonization solid products can be well characterized by a fractal description. Owing to a lack of in situ studies, the change in the fractal structure of coal with coking capability during carbonization remains unclear. Here we report briefly on an in situ study on high-temperature (1000°C) carbonization of four kinds of Chinese typical bituminous coal with coking capability, namely gas coal, fat coal, coking coal and lean coal, by synchrotron radiation small-angle X-ray scattering (SAXS). The change of fractal structure of the coal is analyzed in terms of corresponding mechanisms.

KEYWORDS:

• Coking coal
• high-temperature carbonization
• fractals
• small-angle X-ray scattering (SAXS)

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number U1910206], [grant number U1910201], the Foundation of State Key Laboratory of Coal Conversion [grant number J21-22-604], [grant number J19-20-604] and the National Key R&D Program of China [grant number 2017YFA0403000].