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Identification method of coal spontaneous combustion tendency based on double oxygen uptake

An identification method and coal spontaneous combustion technology, which are applied in the research fields of identification, classification and coal spontaneous combustion process, can solve the problem that it is difficult to accurately evaluate and classify coal spontaneous combustion tendency grades, etc., and achieve simple and reliable methods and testing processes, and uniform classification of grades. , the effect of overcoming the tendency of coal spontaneous combustion

Inactive Publication Date: 2017-05-03
TAIYUAN UNIV OF TECH
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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.

Method used

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  • Identification method of coal spontaneous combustion tendency based on double oxygen uptake
  • Identification method of coal spontaneous combustion tendency based on double oxygen uptake
  • Identification method of coal spontaneous combustion tendency based on double oxygen uptake

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] refer to figure 1 , the present invention adopts figure 2 The device shown is used to identify the spontaneous combustion tendency of coal, and the following steps are implemented:

[0038] (1) Take a fresh coal sample to remove its surface layer, crush it under normal temperature and pressure nitrogen protection gas, screen out a coal sample with a particle size of 0.15-0.28mm, and vacuum dry it. The processed coal sample is used as an experiment coal.

[0039] (2) First open the nitrogen cylinder 1, turn off the air cylinder 2, carry out nitrogen purge to the spiral reactor 4 for 5 minutes, then get about 50g of coal sample and put it into the spiral reactor 4, at the bottom of the reactor there is A 120-mesh sintered plate is used to carry the coal sample. The coal sample was purged with nitrogen for 5 minutes to expel the air in...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/00
Inventor 张玉龙王俊峰邬剑明周春山王涌宇
Owner TAIYUAN UNIV OF TECH
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