Feasibility investigation of utilizing spontaneous combustion energy of abandoned coal gangue by constructing a novel artificial heat reservoir

Developing kilometers-long gravity heat pipe for geothermal energy exploitation

“…For large-scale commercial deployment, we may first consider the geothermal energy exploitation from numerous abandoned oil/gas wells to save the well-drilling cost, which can be the largest initial investment in the SLGHP geothermal systems. 49,50 The SLGHP is essentially a highly efficient heat transport device, which can be also used in industrial scenarios, other than geothermal energy production, for instance, underground coal fire control 51 and heavy oil mining. 52,53…”

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

“…The state and the government have long been clearly required to improve the comprehensive utilization rate of coal gangue, but at present, they still mainly rely on the ground piling up or landfills. The problem of coal gangue disposal has gradually become a constraint on China's efficient development of mineral resources [9][10][11], and an ecological environmental protection strategy is one of the obstacles [12][13][14][15]. How to efficiently, greenly, scientifically, and safely dispose of solid wastes such as coal gangue will inevitably become the key to the realization of an ecological environment and the economic and social development of high quality in the field of coal [16][17][18][19][20][21][22][23][24][25][26].…”