Coal dehydration technology under hole for coal mine

Abstract

The invention discloses a water coal underground dewatering technology for a coal mine, wherein a multi-layered vibration-classifying dewatering sieve is arranged on an unloading position of a first water coal conveying unit; materials on the sieve are conveyed to a coal milling hole through the conveying unit, and slime water below the sieve flows into a sedimentation tank; a slime cleaning pump is utilized for pumping slime at the bottom of the sedimentation tank into a slime centrifuge for dewatering treatment; centrifugate returns to the sedimentation tank for concentration; the dewatered slime is conveyed to the coal milling hole through the conveying unit; and overflow water in the sedimentation tank flows into an underground drain sump, so as to prevent industrial accidents in the steps of belt transportation, lifting, storage and so on caused by water coal. The water coal underground dewatering technology for the coal mine has the characteristics of low labor intensity of workers, good dewatering effect and so on.

Description

Technical field: [0001] The invention relates to an underground coal mine dehydration system. Background technique: [0002] Underground coal mining often causes a large amount of water to enter the coal flow due to water gushing at the working face. When the water content of the raw coal is >20%, the coal-water mixture presents a viscous two-phase fluid, commonly known as "water flow". The emergence of water coal has brought a series of problems to follow-up operations such as transportation, lifting, and storage, resulting in production accidents such as belt slippage, tail silting, thin coal slime, etc., which greatly increased the labor intensity of employees and caused Seriously affected the safe production of the mine. Affected by water and coal, frequent belt accidents occurred in the upper warehouse. During the transportation process, the water and coal on the belt piled up to the tail of the belt conveyor under the action of its own weight. The number of people ...

AI Technical Summary

Problems solved by technology

However, due to the complex and changeable working conditions in the underground, none of the above methods can prevent the formation of water coal, and most production mines have to carry, lift and store as usual after water coal appears, which brings many troubles to the follow-up process and often causes mine discontinued

[0003] Referring to the vibration screening and dehydration method of clean coal in coal preparation plants, Peigou Coal Mine of Zhengzhou Coal Group and Jiulishan Mine of Jiaozuo Coal Industry Group Company have used vibration screening to dehydrate water coal. Although they have achieved certain results, there are still problems Poor dehydration effect of vibrating screen, large amount of maintenance and loss of a large amount of coal slime, poor adaptability to changes in mine production conditions

This is due to the harsh underground working conditions, large amount of water and coal, and a considerable number of large pieces with a particle size of more than 400mm, which cause damage to the screen surface and blockage of the screen holes. The dewatering screen often appears "" due to excessive material accumulation on the screen surface. The phenomenon of "running water" greatly affects the dehydration effect

At the same time, because the screened water was not further treated, it was allowed to enter the underground water tank, causing a large amount of fine-grained coal slime in the screened water to deposit in the water tank and the water tank along the way, which directly affected the safe production of the mine and increased the number of water tanks. and water tank slime cleaning workload

The vibrating screening system cannot be conveniently and quickly added to or withdrawn from the main coal flow line according to the mine production situation, which affects the continuity of mine production

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