Coal spontaneous combustion tendency identification method based on double-oxygen uptake

Abstract

The invention discloses a coal spontaneous combustion tendency identification method based on double-oxygen uptake. The coal spontaneous combustion tendency identification method comprises the following steps: putting a broken and filtered coal sample in a spiral reactor, putting the reactor in a set constant temperature furnace, introducing in dry air, determining oxygen concentrations at the outlet of the reactor under the conditions of 30 DEG C and 90 DEG C respectively, converting the physical oxygen consumption and the chemical oxygen consumption in every gram of coal sample in the low-temperature oxidation process respectively according to the change of the oxygen concentrations, and carrying out weight calculation through the two parameters to obtain a coal spontaneous combustion tendency determination index, wherein the larger the value of the index is, the easier the spontaneous combustion is. Through the obtained technical effect, the physical oxygen consumption and the chemical oxygen consumption in the low-temperature oxidation process are effectively combined to identify coal spontaneous combustion tendency, therefore, the disadvantage that the coal spontaneous combustion tendency cannot be comprehensively evaluated by a physical oxygen adsorption method singly depending on coal is effectively overcome. A double-oxygen uptake method can be used for identifying the coal spontaneous combustion tendency more scientifically and reasonably, the implementation method and the test process are easy and feasible, and the standard of classification is unified.

Description

technical field [0001] The invention relates to a method for measuring coal spontaneous combustion tendency, which is suitable for identification and classification of coal spontaneous combustion tendency and research on coal spontaneous combustion process. Background technique [0002] Coal spontaneous combustion is a prominent problem in the field of coal mine safety production in my country. The coal seams with spontaneous combustion tendency in my country account for about 80% of the total number of mined coal seams. Among them, the mines with thick coal seams in key state-owned coal mines basically have different degrees of spontaneous combustion problems. The spontaneous combustion tendency of coal is an inherent property of coal itself and a dynamic performance of low-temperature oxidation of coal. When coal comes into contact with oxygen, the low-temperature oxidation process of coal begins. Different coal mines and different coal seams have different spontaneous co...

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Problems solved by technology

Therefore, the spontaneous combustion tendency of coal has a great relationship with the physical adsorption oxygen and chemical adsorption oxygen of coal. It is difficult to accurately evaluate and classify the spontaneous combustion tendency of coal only by a single physical oxygen absorption or chemical oxygen absorption.

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