Thermal pressure filtration process for deep dehydration of fine coal suspension liquid and apparatus therefor

Abstract

The invention relates to a hot pressure filtration process and equipment for deep dehydration of fine-grained coal suspension, and relates to the technical field of solid-liquid separation of suspension. This process and equipment integrate mechanical pressure filtration and thermal drying. Mechanical pressure filtration is first performed on multiple sets of diaphragm filter plates—the drying plate unit, and a large amount of filtrate is discharged. The solid material forms a filter cake in the filter chamber, and then the drying plate Heating, pressurizing the diaphragm in the diaphragm filter plate at the same time, making the filter plate stick to the drying plate for hot pressure filtration, evaporating the capillary water into steam, and using the driving force of the steam itself to dehydrate, and at the same time to clean the drainage channel Vacuumize to speed up the dehydration. After a few minutes, the filter cake has been deeply dehydrated, then stop heating, pressurize, vacuumize, and discharge the solid materials. The membrane filter plate of this equipment - the drying plate unit, the drying plate is placed between the two membrane filter plates, so that the pressure filtration and drying are integrated into one equipment, and the equipment adopts the upper feeding or upper multi-channel feeding structure. The invention has the advantages of saving investment, occupying less land, saving energy, high production efficiency and low cost.

Description

Technical field: [0001] The invention relates to a hot pressure filtration process and equipment for deep dehydration of fine-grained coal suspension, and relates to the technical field of suspension liquid pressure filtration drying and solid-liquid separation. technical background: [0002] In the coal washing process, the dehydration recovery technology of fine-grained flotation clean coal, flotation tailings or primary coal slime is traditionally completed by mechanical filtration, but there is a dehydration limit in mechanical filtration, which makes the moisture content of the dehydrated coal slime product relatively high , inconvenient for warehousing, loading and unloading, transportation and use, so that coal slime products become unsalable coal preparation by-products and cannot be fully utilized; and the existing technology often adds a thermal drying and dehydration production system after its mechanical filtration and dehydration production system to solve the ab...

AI Technical Summary

Problems solved by technology

[0004] (2) The cost of dehumidification is composed of the cost of two production operations, filtration and drying, and the cost is increased;

[0005] (3) Since the follow-up drying operation needs to convert all the released moisture into steam for removal, it is an energy-consuming operation, and the production cost remains high

However, how to apply this technical solution to the deep dehydration of fine coal slurry suspension, what process steps to use, what process parameters to use, and what corresponding equipment to use to achieve better results remain to be determined. Personnel in the technical field further create and complete

Moreover, because of the equipment used in the German DE19843028AI patent, its feed channel still passes through the center like the traditional filter press, and the center of the diaphragm is a dead zone without extrusion, so that the effective extrusion The area is reduced, and when it is used in combination with a drying plate, it is easy to crack and damage the feeding hole due to high temperature and fatigue due to back and forth extrusion, which will directly affect the use effect of this technology, and the production efficiency is low, so it must be improved. In order to make the drying plate can be heated evenly and easy to make, it must be well designed.

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