Method for inhibiting spontaneous combustion of coal gangue pile and extracting heat of coal gangue pile for application

Abstract

The invention belongs to the technical field of coal gangue heat utilization, and particularly relates to a method for inhibiting spontaneous combustion of a coal gangue pile and extracting heat of the coal gangue pile for application. The method comprises the following steps: S100, a site without underground water seepage is selected, and a foundation pit is excavated; S200, multiple sets of coaxial sleeves which are arranged in the transverse and longitudinal direction are put into the foundation pit; S300, coal gangue is filled layer by layer, the coaxial sleeves are kept upright and not inclined during backfilling, backfilling is conducted till the position 0.5 m below the ground surface, then a covering layer is laid on the coaxial sleeves for heat preservation, and heat of the coal gangue pile cannot be dissipated into the atmosphere; S400, two rows of exhaust holes are reserved at the two ends of the covering layer, and the exhaust holes are connected with an earth surface air source heat pump for heating; and S500, each of the coaxial sleeves comprises an outer pipe and an inner pipe which are coaxially arranged, water is injected between the outer pipe and the inner pipe through a water pump, water is pumped from the inner pipe, and the pumped hot water is applied.

Description

technical field [0001] The invention belongs to the technical field of coal gangue heat utilization, in particular to a method for suppressing spontaneous combustion of coal gangue piles and extracting the heat for application. Background technique [0002] Coal gangue is one of the industrial solid wastes with the largest discharge in coal mining and other processes. Under natural accumulation conditions, due to its special physical and chemical properties, most coal gangue is prone to spontaneous combustion, which will cause ecological environment and safety problems in mining areas. Therefore, how to cool down and dissipate heat from the coal gangue pile has important practical significance. [0003] At present, the common coal gangue fire extinguishing methods at home and abroad mainly include covering method, excavation method, grouting method, grouting sealing and foam fire extinguishing method, controlled combustion method, low temperature inert gas method and low te...

AI Technical Summary

Problems solved by technology

These methods have all played a role in inhibiting the large-scale combustion of coal gangue to a certain extent, but they have the following disadvantages: (1) There is no "turning waste into treasure", and the spontaneous combustion temperature of coal gangue can reach thousands of degrees Celsius, but such a high-quality heat source does not have Utilize; (2) Coal gangue piles are mostly in the valleys near the mining area, and the upper part cannot be used for living or building factories after backfilling, which wastes land resources

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