Device and method for inhibiting spontaneous combustion of open-air coal piles

Abstract

A device for inhibiting spontaneous combustion of open-air coal piles comprises a water tank, not full. The water tank covered with porous or slit cover plates is arranged below an open-air coal pile. A distribution and discharge pipe externally connected with a blower through an air supply pipe is arranged in the water in the water tank. A level meter is further disposed in the water tank. A water supplement pipe connected with a tap water source or other water sources is disposed on one side of the water tank. A drain pipe provided with a filter and connected with a drainage pump is disposed at the bottom of the water tank. The invention further provides a method for inhibiting spontaneous combustion of open-air coal piles. By the use of the device and method, the amount of oxygen absorbed by coal of the coal piles can be reduced, oxidization speed can be decreased, and adsorption heat and reaction exotherm are decreased. The coal piles can be cooled by air flowing in voids, so that spontaneous combustion of the coal piles is inhibited. The device manufactured according to the method has the advantages of simple structure, low energy consumption, convenience in operation, sufficient air source and the like and is conveniently applicable to coal-fired power plants.

Description

technical field [0001] The invention relates to a device for suppressing spontaneous combustion of open coal piles. The invention also relates to a method for suppressing spontaneous combustion of an open coal pile by using the device. Background technique [0002] In large coal-fired power plants, in order to ensure normal production, it is necessary to reserve hundreds of thousands of tons to hundreds of thousands of tons of coal. The storage period can be as long as several months, and generally it can only be stacked in the open air. Spontaneous combustion often occurs in these open-pit coal piles, especially for raw coal with high volatile content, due to the gradual increase in temperature caused by the heat accumulation from slow oxidation. Analysis and statistical data show that the heat loss of gas coal and long-flame coal with a volatile content greater than 35% is 4.9% on average after 6 months of storage, while the heat loss of lean coal with a volatile content ...

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Problems solved by technology

However, the device required by this scheme and method has complex structure, high energy consumption, and inconvenient operation, which is not convenient for application in coal-fired power plants.

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