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Method and device for sludge filter cake aerobic air drying

An air-drying device and sludge technology, applied in the directions of sludge drying, sludge treatment, sludge treatment, etc., can solve the problems of difficult sludge drying tail gas treatment, poor equipment operation stability, and high energy consumption of sludge drying. Resource utilization, low drying energy consumption, and the effect of reducing drying energy consumption

Active Publication Date: 2010-03-17
SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this treatment method has the following five problems: first, high energy consumption for sludge drying; second, difficult treatment of sludge drying tail gas; third, large investment in equipment; fourth, poor stability of equipment operation; fifth, the possibility of dust explosion

Method used

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  • Method and device for sludge filter cake aerobic air drying
  • Method and device for sludge filter cake aerobic air drying
  • Method and device for sludge filter cake aerobic air drying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of sludge filter cake aerobic air-drying method, it comprises the following steps:

[0038] (1) The sludge filter cake with a moisture content of 70-50% is broken into sludge particles and then dropped to the conveyor belt to disperse into a sludge particle layer. The sludge filter cake can be broken by the corresponding sludge filter cake crushing device. accomplish.

[0039] (2) Dry air at a certain temperature is positively pressured into the sludge particle layer on the slow-moving conveyor belt; the dry air is formed by condensing and separating moisture in the cold exchanger and heating up in the heat exchanger. ; The temperature of the dry air can be between 0 and 90°C. The dry air is transported through the air duct to the dry air inlet between the upper and lower steel meshes of the conveyor belts of each layer. When passing through the bottom and surface sludge particles, it provides oxygen for the aerobic reaction of the sludge and absorbs the sludge ...

Embodiment 2

[0051] The sludge filter cake with a moisture content of 70% enters the sludge filter cake crushing and dispersing device 2 from the feed port, and the crushed sludge particles fall onto the conveyor belt 12 of the sludge aerobic air-drying mechanism. The linear speed of the conveyor belt 12 is 1.5mm / s, the sludge thickness on the conveyor belt 12 is about 50mm. When the sludge is transported to the end of the conveyor belt 12, the sludge will automatically fall on the next layer of conveyor belt 12 moving in the opposite direction, and the sludge will be sterilized by ultraviolet light 19 during the sludge stirring process, and so forth. The temperature of the dry air is 62°C, and it is transported through the air duct to the dry air inlet 11 between the upper and lower steel meshes of each steel mesh conveyor belt to provide drying air to the sludge particles on the upper and lower mesh belts. The dried sludge falls on the discharge crushing mechanism 16 placed at the bottom...

Embodiment 3

[0053] The sludge filter cake with a moisture content of 62% enters the sludge filter cake crushing and dispersing device 2 from the feed port 1, and the crushed sludge particles fall to the conveyor belt 12 of the sludge aerobic air-drying mechanism. The linear speed of the conveyor belt 12 is 3mm / s, and the sludge thickness on the conveyor belt 12 is about 80mm. When the sludge is transported to the end of the conveyor belt 12, the sludge will automatically fall on the next layer of conveyor belt 12 moving in the opposite direction, and the sludge will be sterilized by ultraviolet light 19 during the sludge stirring process, and so forth. The temperature of the drying air is 55°C, and it is transported through the air duct to the drying air outlet 11 between the upper and lower mesh belts of each conveyor belt 12 to provide dry air to the sludge particles on the upper and lower mesh belts. The dried sludge falls on the discharge crushing mechanism 16 placed at the lower part...

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Abstract

The invention discloses a method and device for sludge filter cake aerobic air drying. The method mainly includes that: sludge filter cake is dispersed into granular layers and dry air at certain temperature is fed into slowly moving or overturning sludge granular layers at positive pressure; physical or chemical sterilization treatment is carried out on slowly moving or overturning sludge granules; tail gas containing sludge moisture is exhausted at negative pressure outside the sludge granular layer and is discharged after washing; and the dried sludge granules are further smashed in conveying process by a screw conveyor, thus meeting the requirement of reclamation utilization. The invention has the following advantages: firstly, heat transfer mass transfer efficiency in drying is high and drying energy consumption is low; secondly, drying is speeded up and deodorization effect is realized on the sludge; thirdly, the sludge granules are stable and safe in production in drying process; fourthly, the dried tail gas can be discharged by environmental protection standard after washing; and fifthly, the discharged sludge granules are loose, thus being convenient for reclamation utilization.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and specifically relates to a method and a device for aerobic air-drying of a sludge filter cake, which are dried by combining external energy and the thermal energy of the sludge itself during the sludge drying process. Background technique [0002] A large amount of sludge will be produced in the process of sewage treatment. In order to realize the resource utilization of sludge, it is generally necessary to perform further drying treatment after mechanical dehydration into sludge filter cake. [0003] At present, the commonly used sludge filter cake drying method is mainly to use hot air drying, which directly or indirectly increases the temperature of the sludge itself with medium-high temperature hot air, so that the water in the sludge evaporates quickly. However, this treatment method has the following five problems: first, high energy consumption for sludge drying; second, diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12A61L2/10A61L2/20A61L2/18A61L101/10A61L101/06A61L101/22
CPCC02F1/78F26B17/08C02F11/12C02F1/32F26B2200/18C02F2209/02F26B1/005F26B3/00C02F11/18C02F11/13C02F11/02Y02W10/20C02F1/04C02F11/00C02F1/72C02F2303/04C02F2303/26
Inventor 钟环声吴学伟吴嘉聪孙志民杨海英
Owner SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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