Process for recycling tail gas of pressure filtration machine in coal dressing process

Abstract

The invention provides a process for recycling tail gas of a pressure filtration machine in a coal dressing process. According to the process, a pressurization bin, a low-pressure fan, a high-pressure fan, a filter disk, an upper discharging bin, an upper wedge disc, a lower discharging bin, a lower wedge disc, upper filtrate, lower filtrate, a gas and water separator and a flotation machine are used; a gas outlet of a gas and water separator is connected with an air compressor through a pipeline; an outlet of the air compressor is connected with the flotation machine through a pipeline; after flotation clean coal is dehydrated by the pressure filtration machine, the filtrate enters the gas and water separator, water and gas are separated, and tail gas obtained after separation is compressed to a preset value by the air compressor and is introduced into the flotation machine through a pipeline and a gas flow valve on the pipeline. In a flotation inflation link, extremely fine materials in the tail gas are floated by the flotation machine, resource waste and environmental pollution caused by direct exhaust of the tail gas are avoided, recycling of the tail gas of the pressure filtration machine is achieved, the cost of the inflation link of the flotation process is reduced, the consumed power of a system is reduced and production expenses are reduced.

Description

technical field [0001] The invention relates to a coal preparation process, in particular to a process for reusing tail gas from a pressurized filter in the coal preparation process. technical background [0002] Coal dehydration occupies a very important position in the entire coal preparation process. The moisture content of clean coal is an important indicator of the quality of clean coal products. The commonly used dehydration methods are: gravity dehydration, mechanical dehydration and thermal dehydration. For fine-grained products (flotation clean coal, flotation tailings, coal slime dehydration), the pressure difference caused by mechanical force is usually used to separate the solid and liquid to achieve the dehydration effect. The pressure filter has a large effective pressure, high processing capacity, Due to the advantages of low moisture in the product, it has become the most commonly used equipment for dehydration of fine coal, especially flotation clean coal. ...

AI Technical Summary

Problems solved by technology

[0004] However, in the traditional pressurized filter dehydration process, after the dehydration of the material, the tail gas separated from the filtrate by the gas-water separator is directly discharged into the atmosphere. However, it is inevitable to entrain a certain amount of ultra-fine materials, and the direct discharge is not conducive to energy saving and emission reduction, but also causes a waste of resources

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