Test device for permeability evolution and spontaneous combustion characteristics of pressure-bearing broken coal

Abstract

The invention relates to a device for testing the permeability evolution and spontaneous combustion characteristics of pressure-bearing broken coal. The coal sample chamber includes a coal sample chamber cavity, a piston pressure head and a lower plug. On the support frame of the test device for rate evolution and spontaneous combustion characteristics, the coal sample chamber cavity is a cylindrical hollow structure, the upper part of the coal sample chamber cavity is provided with a piston pressure head, the lower part of the coal sample chamber cavity is provided with a lower plug, The periphery of the cavity is equipped with a heating temperature control device, the inside of the coal sample chamber cavity is respectively equipped with a first sensor and a second sensor, the top of the coal sample chamber cavity is equipped with a pressure control system, and the air inlet built into the piston head is provided with a pipeline connection For the pressure test system, the gas outlet built in the lower plug is provided with a pipeline connected to the gas detection unit. The invention adopts axial loading stress and temperature control to solve the technical situation that existing traditional coal spontaneous combustion test equipment cannot realize stress loading.

Description

technical field [0001] The invention relates to a test device, in particular to a test device for the permeability evolution and spontaneous combustion characteristics of pressure-bearing crushed residual coal. Background technique [0002] my country's coal mine safety situation is still severe, and disasters occur frequently. During the "Twelfth Five-Year Plan" period, among the 759 key coal mines across the country, 54.9% of mines have coal seam spontaneous combustion tendency, and more than 50% of mines have a spontaneous combustion period within 3 months, and nearly 400 fires are caused by spontaneous combustion every year. There are nearly 4,000 fire hazards caused by the natural oxidation of coal. The cumulative amount of coal burned in coalfield fire areas in northern my country alone has reached more than 4.2 billion tons. At present, shallow coal resources are almost exhausted, and many coal mines have begun to enter deep mining, and the mining depth can reach 800 m...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to adopt the method of axial loading stress and temperature control to solve the technical status quo that the existing traditional coal spontaneous combustion test equipment cannot realize stress loading, and to simulate the void ratio of coal left in the goaf under different stress states and surrounding rock temperatures , permeability test device for spontaneous combustion characteristics of pressure-bearing broken coal permeability evolution

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