An Investigation of Pore Structure of Blended Coal Coke Produced by Pyrolysis of Three Kinds of Coal

Blended coal combustion technology is being applied in many power plants as a clean coal combustion technology. In order to investigate the effects of different factors on the pore structure and fractal properties of the blended coal coke, a low-temperature nitrogen adsorption method and scanning electron microscopy are used to study the coal coke consisting of three types of coal after pyrolysis. The adsorption isotherm analysis indicates that the pore structure in blended coal coke consisted mainly of semi-open pores with semi-cates. Moreover, as the proportion of bituminous coal blending increases, the specific surface area of blended coal coke keeps increasing. Increasing the content of petroleum coke in the blended coal samples inhibits the generation of micropores. The microporosity distribution of blended coal coke with different blending ratios is more concentrated than that of mesopores. In addition, it is found that the trend of D1 is consistent with the trend of the ratio of the microporous specific surface area to the total specific surface area in the blended coal coke. The increase of bituminous coal in the blended coal coke results in a complex indicated structure and the increase of petroleum coke content results in a smooth surface