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

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...

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 is also a highly oxidizing flammable and explosive material; (3) use oxidizing agents Inhibition of spontaneous combustion of coal is to oxidize the active groups to lose their oxidative properties before the coal surface active groups react with oxygen, so as to achieve the purpose of chemical inhibition. Different oxidants are selected according to the type and nature of the group, and the passivation of the active group is not very specific.