Author

Ji-Jun Tian

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Open access Oct 2026

Effects of CaCO3 and CaO Loading on Pore Structure, Multifractal Evolution, and Product Transformation During CO2 Gasification of Low-Rank Coal

Underground coal gasification (UCG) is an important in situ conversion technology for the clean and efficient recovery of deep and difficult-to-mine coal resources. Reactions between high-temperature char and gasifying agents such as CO2 and H2O in the reduction zone directly control the generation of valuable gases, p...

Yu-Fei Zhang, Ji-Jun Tian, Shu-Guang Yang et al. · Fractal and Fractional · 0 citations

Open access Sep 2026

Multifractal Characteristics of Pore Structure Evolution in Thermally Damaged Coal-Seam Roof Sandstone Under O2 and CO2 Atmospheres: Implications for Underground Coal Gasification

This study investigated how high-temperature reactive atmospheres associated with underground coal gasification (UCG) differentially modify the pore system of roof sandstone. Roof sandstone from the Shanghai Miao mining area, Inner Mongolia, was conditioned to simulate formation-water saturation and heat-treated at 200...

Jia-Qun Zou, Ji-Jun Tian, Da-Xing Wang et al. · Fractal and Fractional · 0 citations