Experimental device and method for simulating injection of power plant flue gas into goaf to prevent spontaneous combustion of residual coal

Abstract

The invention belongs to the technical field of coal mines, and discloses an experimental device and method for simulating power plant flue gas injection into a goaf to prevent residual coal spontaneous combustion, the experimental device comprises a box body, the top of the box body is provided with a top cover, the side wall and a bottom plate comprise an outer layer steel plate, a polyurethane heat insulation layer and a refractory brick layer which are sequentially arranged from outside to inside, and the side wall of the box body is provided with an air inlet and an air return port; a gas injection port is formed in the top cover, and a second similar material bottom plate, a first similar material bottom plate, a simulated coal seam, a first similar material top plate and a second similar material top plate are sequentially laid in the box body from bottom to top; the bottom of the simulated coal seam is provided with a preset air bag used for supporting residual coal above to construct a goaf, an air inlet roadway, an air return roadway and a coal face are constructed in the simulated coal seam through a steel hollowed-out protection pipe, the goaf is provided with a measuring rod and a heating plate, and the gas injection port pipeline is communicated with the simulated coal seam. The mechanism and effect of preventing residual coal spontaneous combustion by injecting power plant flue gas into the goaf can be researched.

Description

technical field [0001] The invention belongs to the technical field of coal mines, and relates to an experimental device and method for simulating the injection of flue gas from a power plant into a goaf to prevent spontaneous combustion of leftover coal. Background technique [0002] The spontaneous combustion of coal in the goaf often induces chain accidents such as gas, coal dust combustion or explosion, which seriously threatens the safety of mine production and the life safety of workers. In recent years, a large number of pit-head power plants have been formed in the coal-electricity integration construction in my country. The flue gas is a combustion product, and the main component is CO2. If it is directly injected into the well through the pipeline to prevent the spontaneous combustion of coal in the goaf, it can avoid the production of nitrogen. The resulting energy waste saves a lot of money for enterprises, and at the same time realizes the reduction, harmlessness...

AI Technical Summary

Problems solved by technology

The field test investment is too huge and the effect is unknown, so the best method at present is to build a simulated goaf in the laboratory, and give different conditions to promote spontaneous combustion of residual coal, and finally inject power plant flue gas into the goaf to observe and prevent coal residue The effect of spontaneous combustion, in order to provide some guidance for field experiments

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