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Method for determining critical moisture of easy spontaneous combustion of coal

A technology of coal spontaneous combustion and moisture, applied in the direction of material moisture content, etc., can solve problems such as low temperature oxidation, and achieve the effects of improving precision, reliable technology and simple process

Inactive Publication Date: 2019-04-23
CCTEG CHINA COAL RES INST +1
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Problems solved by technology

In recent years, some scholars at home and abroad have also noticed that there is an optimal humidity level that makes coal prone to low-temperature oxidation, but most of the research is only qualitative, and there is a lack of a simple and effective method for determining the critical moisture content of coal that is prone to spontaneous combustion in the prior art. method

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  • Method for determining critical moisture of easy spontaneous combustion of coal
  • Method for determining critical moisture of easy spontaneous combustion of coal
  • Method for determining critical moisture of easy spontaneous combustion of coal

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Embodiment 1

[0054] A method for determining the critical moisture content of coal prone to spontaneous combustion, comprising the steps of:

[0055] Step 1: Establish a CO-based coal critical temperature calculation model, the model is as follows:

[0056]

[0057] According to the formula (1-1), when the gas supply flow rate and the size of the experimental instrument are constant, ln C out with 1 / T i In a certain reaction stage, it is a straight line with a slope of -E / R. The reciprocal 1 / T of the critical temperature of coal spontaneous combustion divides the coal spontaneous combustion process into a low-temperature slow oxidation stage and a high-temperature rapid oxidation stage, and the correlation coefficients are S 1 and S 2 ,Such as figure 1 shown.

[0058] Step 2: Select the cucurbitacin coal mine 2-1 coal seam coal sample, measure the natural moisture content and saturated moisture content of the coal sample to be 5.86% and 14.19% respectively, and the design moisture co...

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Abstract

The invention discloses a method for determining critical moisture of easy spontaneous combustion of coal, and belongs to the technical field of disaster prevention and control of the spontaneous combustion of the coal underground coal mines. The method comprises the following steps that (1) a calculation model of a critical temperature of the spontaneous combustion of the coal based on CO concentration is established; (2) the natural moisture content a and the saturated water content c of the coal are tested by a nitrogen-introducing drying method, and a suitable moisture gradient is designed; (3) a micro-syringe is used for proportionally adding water to prepare experimental coal samples with different water content; (4) the CO concentration of the coal samples with the different water content at 30-180 DEG C is tested by gas chromatograph; (5) lnC<out> to 1 / T curves of the coal samples with the different water content are subjected to two-segment linear fitting, and correlation coefficients of the spontaneous combustion of the coal in different reaction stages are S1 and S2 separately; (6) the critical temperature of the spontaneous combustion of the coal is determined by the maximum value of K=S1S2; and (7) the critical moisture b of the easy spontaneous combustion of the coal is determined by the principle of minimum value. The method can realize quantitative determinationof the critical moisture of the easy spontaneous combustion of the coal.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of coal spontaneous combustion disasters in underground coal mines, and in particular relates to a method for determining the critical moisture content of coal prone to spontaneous combustion, which is mainly used for guiding the technical work of preventing coal spontaneous combustion disasters in coal mines. Background technique [0002] Coal spontaneous combustion is one of the main hazards in mines. In recent years, the mining of coal resources has gradually developed to the west, and the geological structure of the shallow buried coal seam in the west usually leads to a large amount of water in the goaf of the upper coal seam, which makes the remaining coal soaked for a long time, resulting in changes in the coal body; in addition, when mining the lower coal seam In the process of exploring and releasing water, the phenomenon of "water vapor replacement" will appear, which will...

Claims

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Application Information

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IPC IPC(8): G01N25/56
CPCG01N25/56
Inventor 徐长富郭重托姚海飞王雪宁柴佳美孙建贞郑忠亚吴海军张帅孙喜贵王海燕李艳川张思睿赵文超
Owner CCTEG CHINA COAL RES INST
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