Ventilation property test method and device for hypergolic coal waste pile isolating layer

Abstract

The invention relates to a method and a device for testing the gas permeability of an isolating layer of a self inflammable coal refuse heap, which belongs to the technical field of treatment and utilization of environmental, ecological and solid waste. The method comprises the following steps: the device is hermetically connected by a gas injection chamber, a test chamber and an exhaust chamber in turn along the direction of the gas paths, so as to form an enclosed gas chamber; the gas paths of the upstream section and the downstream section are isolated by an isolating layer sample in the test chamber; constant-pressure air flow is injected on the upstream section; a downstream instrument is communicated with the atmosphere; and the gas permeability of the isolating layer sample is determined after the positive pressure difference on both sides of the sample is stabilized. The test method is simple and convenient; the dimension of the sample is large; the test process well simulates the objective reality; and the method can detect the gas permeability of the isolating layer for treating the self inflammable coal refuse heap, and guarantee that the configuration of the isolating layer has the function of air barrier, thereby preventing spontaneous combustion of the coal refuse heap, reducing the hazard of the coal refuse heap on the environment, and improving the ecological environment of mining areas.

Description

technical field [0001] The invention belongs to the technical field of environment, ecology and solid waste disposal and utilization, and in particular relates to a technical method for treating spontaneously combusted coal gangue hills. Background technique [0002] Coal gangue is an inevitable product of coal mining and processing. This waste contains a large amount of S, C, heavy metals and other harmful substances, and is the main source of pollution in mines. Generally speaking, coal gangue accounts for 10-30% of raw coal production. According to incomplete statistics, the cumulative amount of coal gangue in my country has reached more than 3.5 billion tons, and the utilization rate is still less than 30%. Coal gangue contains pyrite, sulfur, coal powder, etc., and it is easy to spontaneously ignite when stacked in the open air, thereby releasing a large amount of pollutants such as dust and toxic and harmful gases such as SO 2 , CO, H 2 S, etc. The leached acidic wat...

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Problems solved by technology

[0008] Most of the air permeability testers (gas permeation meters) available on the market are suitable for air permeability and barrier test of polymer materials such as plastic sheets, films, coatings and related products. They are instruments for testing the barrier properties of packaging materials. Instruments for measuring the permeability of soil or rock, mostly use water as the medium for testing, or measure the gas permeability of small samples (the size of the test piece includes diameter and thickness generally ranging from several to tens of millimeters), and cannot be used for coal Test of Air Permeability of Soil Samples in Isolation Layer of Gangue Dump and Its Barrier Simulation Experiment

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