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Sludge drying method

A sludge and dryer technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of long process operation time, complicated equipment and process, low sludge moisture content, etc., achieving significant environmental benefits and improving Service life, effect of improving heat exchange capacity

Active Publication Date: 2010-11-24
ZHEJIANG FANGYUAN BUILDING MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can reduce the water content of the sludge, the process operation time is too long, the equipment and process used are too complicated, the cost is high, and the water content of the sludge after drying is too low to be directly used for the production of ceramsite.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 Shown: First use two shaftless screw conveyors (model: WLSS40) to transport the sludge with a water content of 85% in the sludge tank to the belt conveyor (model: B600X158m) for 2 minutes, and then use the belt conveyor (Model: B600X158m) After conveying the sludge for 4 minutes to a twin-shaft mixer ((Model: JLSS40) for 2 minutes, then extruding it through an extruder (Model: JLSS40, output 10t / h), the extrusion time for 2 minutes.

[0031]First use the zipper conveyor (model: GSS250, output 5t / h) to transport the extruded sludge particles to the shaftless screw conveyor (model: LSS250) for 2 minutes, and then use the shaftless screw conveyor to transport the sludge After conveying for 4 minutes, the inclined plate made of 2520 heat-resistant stainless steel plate slides the material into the cylinder space at the feed end along the inclined surface. The rotary drum dryer (model: Φ2.2×30m; 0.6 ~5r / min) for 50 minutes, the inlet temperature of the dry...

Embodiment 2

[0034] First use two shaftless screw conveyors (model: WLSS40) to transport the sludge with a water content of 80% in the sludge tank to the belt conveyor (model: B600X158m) for 1 minute, and then use the belt conveyor (model: : B600X158m) transport the sludge for 5 minutes to a twin-shaft mixer ((model: JLSS40) for 3 minutes and then extrude it through an extruder (model: JLSS40, output 10t / h), and the extrusion time is 1 minute .

[0035] First use the zipper conveyor (model: GSS250, output 5t / h) to transport the extruded sludge particles to the shaftless screw conveyor (model: LSS250) for 1 minute, and then use the shaftless screw conveyor to transport the sludge After being transported for 5 minutes, the inclined plate made of 2520 heat-resistant stainless steel plate slides the material into the cylinder space at the feed end along the inclined surface. The rotary drum dryer (model: Φ2.2×30m; 0.6 ~5r / min) for 60 minutes, the inlet temperature of the dryer is 600°C, and t...

Embodiment 3

[0038] First use two shaftless screw conveyors (model: WLSS40) to transport the sludge with a water content of 90% in the sludge tank to the belt conveyor (model: B600X158m) for 3 minutes, and then use the belt conveyor (model: : B600X158m) transport the sludge for 2 minutes to the twin-shaft mixer ((model: JLSS40) for 1 minute and then extrude it through the extruder (model: JLSS40, output 10t / h), the extrusion time is 3 minutes .

[0039] First use the zipper conveyor (model: GSS250, output 5t / h) to transport the extruded sludge particles to the shaftless screw conveyor (model: LSS250) for 3 minutes, and then use the shaftless screw conveyor to transport the sludge After being transported for 2 minutes, the inclined plate made of 2520 heat-resistant stainless steel plate slides the material into the cylinder space at the feed end along the inclined surface. The rotary drum dryer (model: Φ2.2×30m; 0.6 ~5r / min) for 40 minutes, the inlet temperature of the dryer is 800°C, and ...

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Abstract

The invention provides a sludge drying method, which solves the problems of long process operation time, complex flow, high cost and extremely low water content in treated sludge in a conventional sludge treatment method. The sludge drying method comprises the following steps of: A, stirring and extruding, namely, conveying sludge with the water content of 75 to 90 percent to a stirrer through a conveyer, stirring the sludge for 1 to 3 minutes and then extruding the sludge for 1 to 3 minutes; B, drying, namely, conveying the extruded sludge particles to a drier through the conveyer and drying the sludge particles for 30 to 80 minutes, wherein the entrance temperature of the drier is 500 to 1,000 DEG C and the exit temperature is 50 to 120 DEG C; and C, post-treatment, namely, conveying the dried sludge particles to a storehouse through the conveyer, wherein the water content of the sludge particles is 30 to 60 percent, and the tail gas is subjected to desulfurization and dust removal and then is exhausted without peculiar smell. The sludge drying method has the advantages of obvious environment benefit, low cost, recycle and simple technological process.

Description

technical field [0001] The invention relates to a sludge treatment method, in particular to a sludge drying method. Background technique [0002] Sludge refers to the terminal waste of sewage treatment plants and various industries, namely domestic sludge and industrial sludge. These sludges contain a large number of microorganisms, pathogens, emit foul odors, and some also contain heavy metals. The hazards of sludge to the environment mainly include deteriorating water quality, polluting soil and crops, etc.; with the improvement of people's living standards and the scale of production The harmfulness of sludge, a polluting substance, is becoming more and more obvious. Appropriate sludge treatment technology should reduce, stabilize and harmless the sludge. If it is allowed to flood, the consequences will be disastrous. The policy for sludge treatment and disposal in the prior art is "reduction, safety, and recycling". The traditional sludge treatment process is: sludge→...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 杨晓华田生春崔清泉童丽美杨飞
Owner ZHEJIANG FANGYUAN BUILDING MATERIALS TECH
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