Experiment device for simulating natural firing in goaf and test method

Abstract

The invention discloses an experiment device for simulating natural firing in a goaf and a test method. The experiment device is characterized in that an experiment furnace body is provided with a coal outlet, an air intake pipe and an air return pipe; a coal bed, a similar material bottom plate, a preset water bag, a to-be-settled similar material bottom plate, a first similar material top plateand a second similar material top plate are arranged in the experiment furnace body; multiple-point thermocouple testing rods and an air intake bundle pipe are arranged above the second similar material top plate; a covering layer is arranged between the multiple-point thermocouple testing rods; a plurality of thermocouples are arranged on the multiple-point thermocouple testing rods; the multiple-point thermocouple testing rods and the air intake bundle pipe are in tight contact with a similar material; both ends of a coal mining work face on the coal bed are provided with an air intake tunnel and an air return tunnel, an arch-shaped hollow protecting pipe is paved among the air intake tunnel, the coal mining work face and the air return tunnel, and a certain passage space is formed on asupport coal body, so as to build an air intake and return system for the goaf and the work face. The experiment device has the beneficial effect that the whole process of coal natural firing in the goaf under the air leakage condition can be accurately and effectively simulated in the laboratory.

Description

technical field [0001] The invention belongs to the technical field of coal, and relates to an experimental device and a test method for simulating spontaneous combustion in goafs. Background technique [0002] Coal spontaneous combustion is one of the common disasters in the process of coal mining, storage and transportation, which causes a great waste of resources and seriously threatens people's lives and properties. Previous studies have shown that the occurrence and development of coal spontaneous combustion is an extremely complex, dynamically changing, and automatically accelerating physical and chemical process. In addition, coal is a heterogeneous body with extremely complex physical structure and chemical mineral composition. The molecular structure model is still inconclusive, and it is difficult to understand the process of spontaneous combustion of coal theoretically. In addition, since coal spontaneous combustion often occurs in goafs hundreds of meters deep u...

AI Technical Summary

Problems solved by technology

[0013] (1) The size of the existing coal spontaneous combustion simulation experiment device in the goaf is small, so it is difficult to more realistically simulate the spontaneous combustion process of the remaining coal in the goaf from a larger spatial scale;

[0014] (2) The existing goaf coal spontaneous combustion simulation experiment device cannot lay similar materials on the roof and floor of the coal seam, or the laying height is limited, so it is impossible to more realistically simulate the occurrence conditions of the roof and floor of the remaining coal in the goaf;

[0015] (3) The existing coal spontaneous combustion simulation experiment device in the goaf cannot simulate the collapse of the goaf coal and the roof collapse process of the goaf, so it cannot simulate the occurrence of the goaf coal and the roof and floor more realistically state, including the loose and broken state of coal residues, the compaction of coal residues in goafs, the fissure channels and air leakage around goafs

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