Method for preventing coal waste piles from spontaneous combustion

Abstract

A method for preventing coal waste piles from spontaneous combustion is disclosed. According to the method, construction of drill-hole groups is carried out by a grid arrangement method in temperature anomaly regions of coal waste piles; one-dimensional heat transfer sealed pipes are embedded into each drill hole; by high-efficiency heat transfer performance of the one-dimensional heat transfer sealed pipes, heat inside the coal waste piles is continuously transferred to the outside air such that heat is hard to gather; and by synergistic effect of the multiple one-dimensional heat transfer sealed pipes, grid heat-absorption and cooling regions are formed, and temperature of high temperature anomaly regions decreases continuously. By synergy of the multiple grid heat-absorption and cooling regions, internal heat storage conditions of the coal waste piles are destructed, and temperature decreases continuously. Thus, spontaneous combustion is avoided, and the coal waste piles are prevented from spontaneous combustion. The invention brings forward a coal waste piles spontaneous combustion prevention method which is simple to construct and is safe, reliable, economical and efficient. The method provided by the invention has advantages of remarkable cooling effect, small work amount, recycling, low maintenance cost and the like, and has good popularization and application value.

Description

technical field [0001] The invention relates to the technical field of coal gangue hill treatment in mines, in particular to a method for preventing spontaneous combustion of coal gangue hills. Background technique [0002] Coal gangue is solid waste generated and discharged during coal mining and processing, and its output accounts for about 10% to 15% of coal output. In recent years, with the continuous improvement of coal mining mechanization and the rapid development of the coal sorting and processing industry, the discharge of coal gangue has increased year by year. The accumulation of a large amount of coal gangue has now formed thousands of gangue hills, occupying land and wasting more serious is that under the long-term oxidation of air, spontaneous combustion of gangue dumps will occur, and the spontaneous combustion of coal gangue dumps will not only produce a large amount of SO 2 , CO, H 2 Toxic and harmful gases such as S, pollute the atmospheric environment, e...

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Problems solved by technology

The coal-gangue separation method is to sort and recycle the coal in the gangue as much as possible to reduce the content of saturated coal in the gangue, thereby reducing the sulfur content of the gangue and reducing the spontaneous combustion coefficient, but it cannot effectively remove the easily oxidizable components inside the gangue, and it is harmful to the coal gangue. Spontaneous combustion can only play a certain role in preventing; the deep injection of inert gas method is to inject liquid nitrogen, dry ice (injected after gasification) into the deep part of the gangue hill, reduce the temperature of the reaction zone, and replace the gas in the internal pores of the gangue hill at the same time. The method can keep the coal gangue in a low temperature and oxygen-free state for a long time, but its application is greatly limited due to the high cost; in addition, there are other methods such as pressure injection of resistive materials and water spraying to cool down, but they are all due to high cost. , large amount of engineering or unsatisfactory prevention and control effect, etc., it is difficult to be widely popularized and applied, and the prevention of spontaneous combustion of coal gangue still needs further research and solution

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