Process for fully dehydrating coal under hydraulic coal mining well

Abstract

The invention discloses a process for fully dehydrating coal under a hydraulic coal mining well, belongs to the technical field of hydraulic coal mining production methods, and is used for realizing full dehydration and dry conveying and dry hoisting under the hydraulic coal mining well. The technical scheme is that: coal slurry from a hydraulic mining face enters a scraper and pit sizing-desliming screen firstly, block coal (more than 0.5-1.0mm) on the screen is dehydrated by a scraper conveyer provided with a sieve plate and then enters a coal bunker, and products under the screen overflow to a concentration bin; base flow in the concentration bin is pumped to a vibration curve screen and a high-frequency screen for dehydration, coarse slime (0.2 to 1.0mm) on the screens enters the coal bunker, and water under the screens flows back to the concentration bin; and the overflow in the concentration bin is mixed with a flocculating agent and then enters an inclined pipe settling bin, and the base flow fine slime (less than 0.2mm) in the inclined pipe settling bin is pumped to a pressure filter for dehydration and recovery. The invention adopts a three-stage dehydration process, full dehydration and dry conveying and dry hoisting under the hydraulic coal mining well are completely realized, a coal and water hoisting system and a ground dehydrating system are eliminated, and the process has the advantages of low investment cost and low total power of running equipment.

Description

technical field [0001] The invention relates to an all-coal underground dehydration process in hydraulic coal mining production, and belongs to the technical field of hydraulic coal mining production methods. Background technique [0002] In the hydraulic coal mining production process, there are two kinds of processes: the full hydraulic process in which all the coal is dehydrated on the ground, and the staged lifting process in which most of the coal is dehydrated underground. Among them, the full hydraulic lifting process is to crush all the raw coal underground to a certain particle size, and use a large-size coal-water pump to lift it to the ground for dehydration treatment through pipelines. The service life is short, the maintenance cost is high, and the system is prone to pipe plugging accidents, which affect mine production. Most of the underground coal dehydration classification lifting process is implemented to overcome the shortcomings of the full hydraulic proc...

AI Technical Summary

Problems solved by technology

Among them, the full hydraulic lifting process is to crush all the raw coal underground to a certain particle size, and use a large-size coal-water pump to lift it to the ground for dehydration treatment through pipelines. Short service life, high maintenance costs, and the system is prone to pipe plugging accidents, which affect mine production

Most of the underground coal dehydration classification lifting process is implemented to overcome the shortcomings of the full hydraulic process. This process divides the coal into two parts underground. Coal with a particle size is lifted by a coal water pump through the pipeline to the ground for dehydration treatment. The water-to-coal ratio of this method is 1:15-20, and the production water is circulated up and down the well. The waste of water and electricity is serious, and the full-hydraulic process has not been completely solved. existing problems

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