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A kind of sludge secondary vapor compression drying method

A technology of secondary steam and drying method, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of low secondary steam cleanliness, poor sludge fluidity, high dust content, and achieve clean secondary steam and exhaust gas. , The effect of low sludge weight and secondary steam cleaning

Inactive Publication Date: 2011-12-14
HANGZHOU DIANZI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that for sludge drying, due to the poor fluidity and easy bonding of sludge, if the above-mentioned drying method is directly used for sludge drying, the scaling and secondary steam cleanliness of the sludge during the drying process will be significantly reduced. Low, high dust content, low drying efficiency and other problems are difficult to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The dewatered sludge produced in the sewage treatment process and the heavy oil obtained from petroleum refining are evenly mixed into oil sludge according to the weight ratio of 5:1.

[0038] Start the vertical disc dryer, send the sludge into the drying chamber of the vertical disc dryer, and the moisture in the sludge in the drying chamber will naturally evaporate to produce secondary steam. After the secondary steam is led out of the drying chamber of the dryer, the saturated secondary steam is separated by a centrifugal separator, and the primary condensed water and primary tail gas are discharged. Saturated secondary steam is compressed into superheated steam by a centrifugal compressor, and sent to the heating chamber of the dryer as a heat source. After heat exchange, the superheated steam is condensed into secondary condensed water and secondary tail gas, and is discharged from the dryer; during the drying process of sludge in the drying chamber The secondary s...

Embodiment 2

[0042] The dewatered sludge produced in the sewage treatment process and the light oil obtained from petroleum refining are evenly mixed into oil sludge according to the weight ratio of 20:1.

[0043] Start the paddle dryer, send the oil sludge into the drying chamber of the paddle dryer, and the moisture in the oil sludge in the drying chamber will naturally evaporate to produce secondary steam. After the secondary steam is led out of the drying chamber of the paddle dryer, the saturated secondary steam is separated by a gravity separator, and the primary condensed water and primary tail gas are discharged. The saturated secondary steam is compressed into superheated steam by a high-pressure fan, and sent to the heating chamber of the paddle dryer as a heat source. After heat exchange, the superheated steam is condensed into secondary condensed water and secondary exhaust gas, and is discharged from the dryer; the sludge in the drying chamber is dried During the process, the ...

Embodiment 3

[0047] The dewatered sludge produced in the sewage treatment process and waste rubber and plastic pyrolysis oil are evenly mixed into sludge according to the weight ratio of 10:1.

[0048] Start the horizontal disc dryer, send the sludge into the drying chamber of the dryer, and the moisture in the sludge in the drying chamber will naturally evaporate to produce secondary steam. After the secondary steam is led out of the drying chamber of the horizontal disc dryer, the saturated secondary steam is separated by a centrifugal separator, and the primary condensed water and primary tail gas are discharged. The saturated secondary steam is compressed into superheated steam by a turbo compressor, and the superheated steam is sent to the heating chamber of the horizontal disc dryer as a heat source. After heat exchange, the superheated steam is condensed into secondary condensed water and secondary tail gas, and discharged out of the dryer ; During the drying process of the oil slud...

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Abstract

The invention relates to a secondary steam compressed drying method of sludge. Present drying methods have the disadvantages of high energy consumption and low efficiency. The method of the invention comprises the following steps: uniformly mixing dewatered sludge generated in the process of sewage treatment with oil according to a weight ratio of 1-20:1 to form oil sludge, drying the oil sludge with secondary steam, carrying out oil and dry sludge separation on the dried oil sludge; reusing separated oil as a raw material of mixed oil sludge, and treating separated dry sludge as a dry finished product of sludge; and separating saturated secondary steam from the secondary steam generated in the process, compressing to superheated steam superheated steam, and sending the superheated steam which is treated as a heat source to a heating chamber of a drier. The method of the invention fully utilizes the heat energy of the secondary steam, so the energy consumption of a drying system is greatly reduced; and no dust is entrained in the drying process, so the cleaning of heat exchange surfaces of a drying device is kept, and the drying efficiency is high.

Description

technical field [0001] The invention relates to a sludge drying method, in particular to a sludge secondary vapor compression drying method, which belongs to the technical field of waste treatment. Background technique [0002] A large amount of sludge is produced in the process of sewage treatment, and the improvement of sewage treatment rate and sewage treatment standard has led to an increase in the amount of sludge produced. Because the water content of the sludge after mechanical dehydration is extremely high (up to about 80%), and the sludge generally contains a large amount of harmful chemicals and heavy metals and other pollutants. Therefore, direct landfill or agricultural use of high-moisture sludge is generally prohibited at home and abroad. Sludge thermochemical treatment methods (such as sludge incineration, pyrolysis, etc.) have the advantages of harmlessness and thorough reduction. It is a very promising sludge resource treatment method, which has been gradua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 张志霄马加德
Owner HANGZHOU DIANZI UNIV
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