Powdered activated carbon regeneration system and method for reducing powder pollution

Abstract

The invention discloses a powdered activated carbon regeneration system and method for reducing powder pollution. The system is composed of a carbon pulp dehydration device, a dehydration and granulation integrating device, a powdered activated carbon regeneration multi-section furnace and a grinding device; after powdered activated carbon used for adsorbing sewage is adsorbed to be saturated, thepowdered activated carbon is firstly conveyed into the dehydration device to be dehydrated and the moisture content of carbon pulp is reduced to 50 percent to 60 percent; then the carbon pulp is conveyed into the dehydration and granulation integrating device and is dehydrated again until the moisture content range is 25 percent to 35 percent; the powdered activated carbon in the carbon pulp is granulated and molded under the condition that an adhesive is added and then is discharged in a spherical grain form; then the spherical grain activated carbon is conveyed into the powdered activated carbon regeneration multi-section furnace and powdered activated carbon regeneration is carried out under the action of high temperature of 700 DEG C to 850 DEG C; after being cooled, the spherical grain activated carbon is conveyed into the grinding device; the spherical grain activated carbon is ground into the powdered activated carbon. By adopting the powdered activated carbon regeneration system and the method for reducing the powder pollution, dust raising in regeneration and conveying processes is avoided and the environment pollution is reduced; meanwhile, the loss of the activated carbon is reduced and the regenerated activated carbon can be completely recovered to original adsorption performance.

Description

technical field [0001] The invention belongs to the technical field of activated carbon regeneration, and relates to a powdered activated carbon regeneration system and method for reducing dust pollution, in particular to a combination of granulation and powder milling technology as the auxiliary and multi-stage furnace high-temperature regeneration technology as the main method, A powder activated carbon regeneration system and method for reducing dust pollution. Background technique [0002] Powdered activated carbon has a lot of micropores and a huge specific surface area, so it has a strong physical adsorption capacity and can effectively adsorb organic pollutants in wastewater. It is widely used in advanced treatment units of large-scale sewage treatment projects. [0003] In order to save costs and avoid secondary pollution, it is generally necessary to regenerate the waste powdered activated carbon with saturated adsorption. At present, the commonly used regeneration...

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Problems solved by technology

[0005] (1) The powder of powdered activated carbon is relatively fine, within the explosion limit range, if it encounters a heat source (open flame or temperature), it is easy to cause a dust explosion, which is extremely destructive

[0006] (2) At present, the process and equipment for the regeneration of granular activated carbon are very mature in China, but the regeneration of powdered activated carbon is still in the experimental research stage

The light and fine characteristics of powdered carbon bring great difficulties to its regeneration. If a conventional high-temperature regeneration furnace is used for the regeneration of powdered activated carbon, the loss of carbon powder is much greater than that of granular carbon at high temperature, and the regeneration effect is not good.

[0007] (3) Powdered activated carbon is easy to harden in the presence of water, and once hardened will seriously affect the regeneration effect during the high-temperature regeneration process

[0008] (4) Due to the light weight of powdered activated carbon, the labor intensity of carbon powder during transportation, loading and unloading, etc. is high, which can easily cause dust to fly, resulting in unnecessary loss of raw materials and environmental pollution, and activated carbon dust can cause upper respiratory tract mucous membranes Inflammation and occupational asthma are very harmful to operators

[0009] (5) In the high-temperature regeneration process of powdered activated carbon, supporting dust removal facilities are required, such as bag filter, but the dust removal effect is not good, because the particle size of powdered carbon is relatively small, and it is easy to penetrate the bag

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