Small simulation device for testing spontaneous combustion period of coal

Abstract

The invention discloses a small simulation device for testing a spontaneous combustion period of coal. The device comprises a spontaneous combustion reaction furnace, a sand bath device, a temperature acquisition system, a temperature compensation system, a gas supply system and a gas analysis system, wherein the spontaneous combustion reaction furnace is provided with a dual-layer coal oxidation furnace nested structure for the first time, and the problem of heat loss of the existing coal spontaneous combustion simulation device is actually solved; the sand bath device has wider temperature control range and higher temperature control accuracy, realizes uniform heat conduction, is suitable for high-temperature work and avoids potential safety hazards; and as another temperature protection structure outside the dual-layer coal oxidation furnace nested structure, the sand bath device provides good temperature protection to the entire simulation process of spontaneous combustion of coal. The device disclosed by the invention works stably, has high simulation similarity, can perfectly simulate the spontaneous combustion process of coal, and can be used for testing the shortest spontaneous combustion period of coal as well as judging and predicting the condition, place and time of the spontaneous combustion of coal under actual conditions and the like.

Description

technical field [0001] The invention relates to a small-scale simulation device for spontaneous combustion and ignition of loose coal bodies in fully mechanized caving face gobs and roadways, which realizes the experimental simulation of the entire process of coal spontaneous combustion and ignition, and solves the determination of conditions, locations and time of coal spontaneous combustion and ignition under actual conditions and forecasting problems. Background technique [0002] In the prior art, there are two kinds of simulation devices for testing coal spontaneous combustion period, the principle of which is basically the same: the coal sample reaction vessel is supplied with gas by an air supply system composed of an air compressor and an air supply pipe, so that the coal and the oxygen in the air Coal-oxygen recombination reaction occurs, heat is released, and then the temperature gradually rises, and finally spontaneous combustion is achieved. During the experimen...

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Problems solved by technology

The water bath temperature protection system uses water as the temperature protection medium. The biggest disadvantage of this medium is that the maximum temperature of the medium (100°C) is too low to meet the temperature above 300°C required for coal spontaneous combustion; the temperature protection system of the programmed incubator uses air as the temperature protection medium , the disadvantage of this medium is that it will generate heat flow when heated, resulting in uneven heat transfer

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