Steam rotating heat conduction sludge drying device

Abstract

A steam heating type sludge drying device comprises a rotating heat conduction drier, a dried sludge distributor, a dried sludge lifter and the like, wherein dried sludge returns to a variable sludge return opening; the dried sludge distributor is utilized for precisely controlling the sludge moisture at the back of the sludge return opening to be lower than the moisture in a viscous area; a plurality of blades are connected onto a hollow shaft; a blade closure plate, a blade water collecting plate and blade reinforcing ribs are arranged in each blade; specially designed blade steam inlet water discharge pipes penetrate through the hollow shaft between the blade closure plates and the blade water collecting plates, so that blade steam inlet pipes and water discharge openings are all close to the center of the hollow shaft, condensate water in the hollow shaft is prevented from backwards flowing into the blades, and water flowing from the blades is prevented from directly entering blade steam inlets. In the frame structure of the steam heating type sludge drying device, the hollow shaft is high in rigidity and strength; the backward flowing of the condensate water is avoided; the dried sludge return amount is small; the unit area dry sludge amount is large.

Description

technical field [0001] The invention belongs to the field of sludge drying treatment, and relates to a steam indirect heating type drying device, in particular to a steam type rotary heat conduction drying device for treating sludge. Background technique [0002] During the drying process of the sludge, when the moisture content is lower than a certain value (the upper limit of the viscous zone), the viscous phenomenon begins to appear, which is manifested by the increase of the shaft torque, the drying rate is low, and it is not easy to dry, and then drops to another value ( After the lower limit of the viscous zone), the sludge stickiness disappears. In order to avoid the sticky phenomenon, the following two methods are usually used to solve it: (1) Control the moisture content of the dry sludge to be higher than the upper limit of the viscous zone, which is called semi-dry (2) Return the dry sludge to the wet sludge inlet and mix it with the wet sludge so that the moistur...

AI Technical Summary

Problems solved by technology

[0004] In summary, the steam indirect heating sludge drying device has the following technical problems: 1. The condensed water in the hollow shaft will flow back into the blades, which will affect the drying rate; In order to solve this problem, the dry sludge is usually back-mixed to the sludge inlet, so that the moisture content of the sludge entering the dryer is lower than the moisture content in the viscous zone. Because the moisture content of the wet sludge is relatively high, the amount of back-mixing is extremely high. Large, affecting thermal efficiency; 3. The amount of returned material is not easy to control, affecting operation

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