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A municipal sludge treatment method and system thereof

A municipal sludge and treatment method technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of high energy consumption and long time consumption, and reduce environmental pollution Effects of pollution, energy saving, and reduction of heavy metal content

Active Publication Date: 2022-07-22
中铁水务集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the related technologies mentioned above, the inventor believes that the current drying method takes a long time and consumes a lot of energy

Method used

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  • A municipal sludge treatment method and system thereof
  • A municipal sludge treatment method and system thereof
  • A municipal sludge treatment method and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] refer to figure 1 and figure 2 , the municipal sludge treatment method includes the following steps:

[0049] S1. Put 0.5t of municipal sludge with a solid content of 20% in a storage bin (not shown in the figure), and then continuously transport the municipal sludge in the storage bin to the thin-layer evaporator 101, and the saturated steam The temperature is 170°C, the sludge is dried in the thin-layer evaporator 101 for 15 minutes, and is indirectly heated by saturated steam to obtain sludge with a solid content of 45%;

[0050] S2. Chop the sludge obtained in step S1 into a columnar body with a diameter of 8 mm to obtain sludge strips, place the sludge strips in the belt dryer 102, and the heat source used by the belt dryer 102 is the step The steam after heat exchange and cooling in S1, the steam temperature in the belt dryer 102 is 110°C, and the sludge bars are directly contacted and dried with the steam to obtain dried sludge with a solid content of 85%;

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Embodiment 2

[0056] A municipal sludge treatment method comprises the following steps:

[0057] The difference from Example 1 is that step S1 also includes a pretreatment step of sludge:

[0058] The municipal sludge with a solid content of 20% in the storage bin is placed in the centrifugal mechanism 9 for centrifugation to obtain a sludge slurry with a solid content of 35%, and then the sludge slurry is placed in the thin-layer evaporator 101 in step S1 , complete the next steps.

Embodiment 3

[0060] A municipal sludge treatment method comprises the following steps:

[0061] The difference from Example 2 is that in step S1, the temperature of the saturated steam in the thin-layer evaporator 101 is 200°C, and the sludge drying time in the thin-layer evaporator 101 is 10 min, to obtain a solid content of 50%. sludge;

[0062] S2. Chop the sludge obtained in step S1 into sludge bars with a diameter of 7 mm, the sludge bars are columnar bodies, and the steam temperature in the belt dryer 102 is 100° C. to obtain a solid content of 90%. drying sludge;

[0063] S3. The dried sludge obtained in step S2 is made into 3mm sludge particles;

[0064] S4. Set the temperature in the gasifier 103 in step S3 to 1100°C;

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Abstract

The present application relates to a municipal sludge treatment method and a system thereof, belonging to the field of municipal sludge treatment methods. The municipal sludge treatment method includes the following steps: S1. put into a thin-layer evaporator to obtain sludge residue; S2. put the sludge residue Chop the sludge sticks, put the sludge sticks into the belt dryer to obtain dried sludge; S3. Make the dried sludge into sludge granules; S4. Put the sludge granules into the gasifier, and the sludge The organic substances in the mud particles are cracked to generate combustible gas, and the inorganic substances in the sludge form residues; S5. Pass the combustible gas obtained in step S4 into the hot blast stove to be fully burned to form high-temperature flue gas; S6. The high temperature flue gas passes through the waste heat boiler to make the water in the waste heat boiler form saturated steam, and the saturated steam is passed into the thin-layer evaporator. Each step of the municipal sludge treatment method in the present application has complementary advantages, improves the drying effect of municipal sludge, and can also effectively save energy.

Description

technical field [0001] The present application relates to the field of municipal sludge treatment methods, and in particular, to a municipal sludge treatment method and a system thereof. Background technique [0002] Sludge is a solid precipitated material produced by the water and sewage treatment process. If the sludge cannot be treated in a standardized way, it will cause "secondary pollution". [0003] The initial sludge treatment methods are mainly landfill and composting, and the disposal methods are backward. With the country's restrictions on the agricultural use of sludge and landfill disposal, sludge incineration can quickly turn waste into treasure. It has become the research direction of the final disposal of sludge. However, due to the high water content of municipal sludge, further dehydration treatment is required before incineration to meet the requirements of self-sustained combustion. The current drying method is generally to set a heating component in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/13C02F11/127C10B53/00
CPCC02F11/13C02F11/127C10B53/00Y02P20/129
Inventor 王文刚王雷余波严寒杨凯任龙刚赵浩赵鹏
Owner 中铁水务集团有限公司