Medicament for prolonging coal ignition period of coal-type coal pile capable of quite easily achieving autoignition

Abstract

The invention relates to a medicament for prolonging the coal ignition period of a coal-type coal pile capable of quite easily achieving autoignition. The medicament comprises the following raw materials of a high-molecular material copolymer, an anionic polymer material, a bipolar and complexing high-molecular material, a cross-linking agent, a plasticizer and a silane coupling agent. According to the medicament, the medicament is attached to the surfaces of coal particles by stirring and spraying, and the medicament enters a stabilization period after 3-4 hours at the normal temperature, deposition is formed on the surfaces of the coal particles, the deposition layer can smoothly pass through the water vapor, meanwhile, the contact between oxygen and coal can be blocked, and the oxidation reaction of the coal, the sulfide in the coal and the like is prevented, so that the heating process of the coal is kept at 80 DEG C or below, the water can be continuously evaporated, but the temperature of the coal cannot be continuously increased due to oxidation of the carbon and other compounds, the temperature is reduced as less and less water is evaporated, and the ignition period of thecoal which easily achieves the autoignition is effectively prolonged.

Description

technical field [0001] The invention relates to a chemical inhibitor for prolonging the ignition period of coal, in particular to a medicament for prolonging the ignition period of coal for coal piles of highly prone to spontaneous combustion coals. Background technique [0002] The traditional coal natural prevention technology is generally for the treatment of the whole coal and stop coal mining, and there are few technologies for prolonging the ignition period specifically for the piled coal and scattered coal. [0003] There are generally three main coal pile anti-spontaneous combustion technologies, namely: ① coal pile compaction or earth covering compaction; ② water injection, grouting and spraying of water-retaining inhibitors, nitrogen injection, and inert foam injection; ③ composite concrete is also used in recent years. The gel is combined with fly ash, loess and coal gangue as the main reinforcing agent. The gel has degradable foam material, which makes the agent ...

AI Technical Summary

Problems solved by technology

However, these technologies have certain deficiencies, and they are not yet able to comprehensively solve the problem of the short ignition period of coal: ① Compaction and soil covering cannot effectively reduce the temperature inside the coal, and at the same time cannot perform oxygen isolation well, making the coal The spontaneous combustion of coal has been prolonged, but coal recombustion is frequent; ②, water injection, grouting, and water-retaining inhibitor spraying methods are more practical for the whole coal or coal surface where mining is stopped, but for scattered coal and piled coal due to Adding a large amount of water will cause a serious drop in coal calorific value, affecting coal quality and sales

And this kind of method needs to be sprayed regularly and repeatedly according to the evaporation of water; and it is not adaptable to extreme environments. In the extreme environment of Northwest China, such as: in Hami, Xinjiang, the ambient temperature is above 40°C in summer, and the annual average relative humidity is 30°C. %, resulting in fast evaporation of water, the water retention performance of the inhibitor is greatly affected, and the ability to form a continuous water film on the coal surface is poor, and even the inhibitor will become a chemical assistant, which shortens the ignition period of coal; and the northwestern region Water resources are scarce, such methods are not effective in use, and the cost of water is high

③Three-phase foam prevention and control technology of coal spontaneous combustion using composite gel combined with fly ash, loess and coal gangue as reinforcing agents. The gel has the properties of a degradable foam material. This method is more practical; however, for loose coal and heap coal, if mixed with raw coal, it needs to be added in a large amount, and the cost is also high. At the same time, due to the newly added ash, the calorific value of coal will decrease and affect the quality of coal; If the surface of the pile is sprayed, the treated coal pile cannot be transported and sprinkled. If the surface layer is damaged, its ability to block oxygen will be reduced, resulting in a shortened ignition period, and may spontaneously ignite again during the delivery process.