Method and equipment for granulating wet sludge soft particles

Abstract

The invention discloses a method for granulating wet sludge soft particles. Sludge after being pressed and filtered is extruded into sludge strings by a sludge string extrusion machine at the top of a mixing tank, combustible powder is sprayed to the sludge strings for serving as an isolator by adopting a powder spraying machine of a powder spraying gun which is fixedly connected on the side wall of the mixing tank in the process that the sludge strings fall from top to bottom, the sludge strings coated with the combustible powder fall on a turntable granulating machine of which the bottom is laid with the combustible powder, and soft body granulation is carried out under the rotation of the turntable granulating machine to form dispersive wet sludge soft particles. The invention also discloses equipment for realizing the method. The invention simplifies a subsequent sludge drying process; the sprayed combustible powder can be used as the isolator, which is beneficial to sludge granulation and solves the problems of sludge caking and wall sticking effectively; moreover, the sprayed combustible powder can also act as a combustion-supporting function when sludge is incinerated; and the invention has simple equipment, low energy consumption and high benefit, is safe and sanitary, is convenient for popularization and use and can promote the industrialization progress of the drying incineration of the sludge.

Description

technical field [0001] The invention relates to a method for sludge drying pretreatment, in particular to a method for granulating wet sludge soft particles. The invention also relates to equipment for carrying out the granulation method. Background technique [0002] The incineration treatment of sewage plant sludge can make full use of the characteristics of sludge containing a large amount of combustible substances, and the treated sludge can be used as fuel. However, the water content of the sludge produced by the sewage plant is still as high as 70% to 80% after mechanical dehydration, so it cannot be used for direct incineration. Sludge must be effectively dried before it can be used for incineration. [0003] Traditional sludge drying equipment mainly includes direct heating type such as drum, fluidized bed, etc., indirect heating type such as drum, disc, thin layer, disc, etc., heat radiation heating type such as belt type, spiral type, etc. Most of these drying e...

AI Technical Summary

Problems solved by technology

However, the dry material back-mixing process generally needs to add dry sludge particles equivalent to 1 to 2 times the weight of wet sludge, and its actual net flow rate is nearly doubled, which greatly reduces the production capacity of sludge drying equipment

At the same time, when the dry mud re-enters the drying system and heats up together with the drying of the wet materials, it still needs to absorb energy, resulting in a lot of energy waste

In addition, the dry material back-mixing process requires a large number of equipment such as conveying, storage, separation, crushing, screening, lifting, mixing, and feeding before feeding and after solid conveying, which makes the overall drying system complex

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