Composite stopping agent preventing coal spontaneous combustion based on low-temperature oxidation mechanism of coal

A chemical inhibitor, coal spontaneous combustion technology, applied in the direction of dust prevention, fire prevention, other chemical processes, etc., can solve problems such as poor targeting of passivation active groups, large fire danger of oxidants, and increased heat of coal reaction. , to achieve the effect of stable properties, changing spontaneous combustion characteristics, and simple use

Inactive Publication Date: 2013-03-13
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of oxidants as inhibitors has some disadvantages: (1) The oxidation reaction process is an exothermic reaction, and if the heat of reaction generated is not removed in time, the heat of reaction of the coal body will increase rapidly; (2) the oxidant It has a greater fire risk, such as potassium permanganate meeting high temperature and contacting with organic matter and acids, it can cause fire and explosion; and urea peroxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Weigh 0.5% of catechin, 0.5% of 4,4-diisofurylidene bisphenol (12-14) carbon alkyl ester and 4% of polyethylene glycol 200 and fully mix with 0.5% of The dialkyl sodium sulfate solution is mixed to form a composite inhibitor solution. Select 500 grams of coal samples whose spontaneous combustion tendency grade is easy to spontaneous combustion, fully mix the prepared composite inhibitor solution with the coal samples, let stand for 12 hours, then dry in a vacuum drying oven at 40°C for 24 hours, and put them in a desiccator for later use .

[0011] (1) Using temperature programming to simulate the spontaneous combustion process of coal, it is measured that the cross point temperature of the coal sample treated with the compound inhibitor solution is 33°C higher than that of the untreated coal sample, while the same mass of the coal sample treated with the same mass is 20% MgCl 2 The solution-treated coal sample had a cross point temperature only 22°C higher...

Embodiment 2

[0023] Embodiment 2: Weigh 1% catechin, 0.5% 4,4-diisofurylidene bisphenol (12-14) carbon alkyl ester, 7% polyethylene glycol 200 and fully mix them with 1% The sodium lauryl sulfate solution is mixed to form a composite inhibitor solution. Select 500 grams of coal samples whose spontaneous combustion tendency grade is easy to spontaneous combustion, fully mix the prepared composite inhibitor solution with the coal samples, let stand for 12 hours, then dry in a vacuum drying oven at 40°C for 24 hours, and put them in a desiccator for later use .

[0024] (1) The coal spontaneous combustion process was simulated by temperature programming, and the cross point temperature of the coal sample treated with the composite inhibitor solution was measured to be 38°C higher than that of the untreated coal sample.

[0025] (2) The resistance rate measured by the method for measuring the resistance rate of CO generation reaches 90%.

[0026] Others are the same as in Example 1.

Embodiment 3

[0027] Embodiment 3: Weigh 0.75% catechin, 0.5% 4,4-diisofurylidene bisphenol (12-14) carbon alkyl ester, 6% polyethylene glycol 200 and fully mix them with 0.75% The sodium lauryl sulfate solution is mixed to form a composite inhibitor solution. Select 500 grams of coal samples whose spontaneous combustion tendency grade is easy to spontaneous combustion, fully mix the prepared composite inhibitor solution with the coal samples, let stand for 12 hours, then dry in a vacuum drying oven at 40°C for 24 hours, and put them in a desiccator for later use .

[0028] (1) The coal spontaneous combustion process was simulated by temperature programming, and the cross point temperature of the coal sample treated with the compound inhibitor solution was measured to be 35°C higher than that of the untreated coal sample.

[0029] (2) Using the method for measuring the resistance rate of CO generation, the resistance rate reaches 86%.

[0030] Others are the same as in Example 1.

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PUM

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Abstract

The invention relates to a composite stopping agent preventing coal spontaneous combustion based on a low-temperature oxidation mechanism of coal, which belongs to the stopping agent preventing coal spontaneous combustion. The composite stopping agent is characterized by comprising the components of catechinic acid, nontoxic phosphite ester, polyethylene glycol 200, lauryl sodium sulfate and solvent-water. The concentration of raw materials in the solvent-water by mass percent is 0.5-1% of catechinic acid, 0.5-1% of nontoxic phosphite ester, 4-7% of polyethylene glycol 200 and 0.5-1% of lauryl sodium sulfate. The stopping agent can not only be in substitution reaction with methyl and methylene in coal to generate stable ether matters, but also be interacted with free radicals of alkyl peroxides generated by oxidization of methyl and methylene in the coal. The free radicals of peroxides are destroyed, so that generation and activity of active groups such as methyl, methylene and the like in coal spontaneous combustion can be inhibited, therefore, the spontaneous combustion character of coal is fundamentally changed and spontaneous combustion of coal is inhibited. Meanwhile, the stopping agent has the physical moisturizing function and can lock water injected in the coal better, so as to prevent coal spontaneous combustion better in the physical inhibition respect.

Description

technical field [0001] The invention relates to an inhibitor for preventing and controlling spontaneous combustion of coal, in particular to a composite inhibitor for preventing and controlling spontaneous combustion of coal based on the low-temperature oxidation mechanism of coal. Background technique [0002] The coal spontaneous combustion disaster is one of the safety problems that need to be solved urgently. At present, the use of chemical inhibitors to prevent coal spontaneous combustion is one of the commonly used fire prevention technologies in coal mines at home and abroad. Inhibitors are chemical agents that prevent coal from oxidizing and spontaneous combustion, also known as oxygen inhibitors. Many chemical substances have been used as coal spontaneous combustion inhibitors, such as: CaCl 2 , MgCl 2 , NaCl and other hygroscopic salts, calcium hydroxide, water glass, etc. However, the inhibitory effect of these substances on coal is achieved by isolating coal-o...

Claims

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Application Information

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IPC IPC(8): E21F5/06C09K3/00
Inventor 王德明窦国兰张祎王咏一曹凯何飞
Owner CHINA UNIV OF MINING & TECH
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