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Directional staged pyrolysis and carbonization method for sludge

A sludge carbon and sludge technology, which is applied in the field of graded directional pyrolysis sludge carbonization, can solve problems such as uneven heating, and achieve the effects of good physical and chemical properties and increased specific surface area.

Inactive Publication Date: 2017-05-31
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for grading and directional pyrolysis sludge carbonization. The present invention uses microwaves to heat the sludge as a whole, which solves the problem that the traditional heating method uses heating to drive heat exchange through temperature differences between materials during the amplification process. , there is a problem of uneven heating in the material

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  • Directional staged pyrolysis and carbonization method for sludge

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Embodiment 1

[0032] A method for grading and directional pyrolysis sludge carbonization, comprising the following steps:

[0033] (1) Dehydration and drying: the sludge is dehydrated to a sludge with a moisture content of 40% to 60%;

[0034] (2) Low-temperature baking: the sludge dehydrated and dried in step (1) is subjected to low-temperature baking treatment at 200° C. for 1 hour;

[0035] (3) Medium-temperature carbonization: the solid product obtained in the step (2) low-temperature baking treatment is heated to 500° C. by microwaves for 0.5 h of medium-temperature carbonization to obtain sludge carbon.

[0036] The dehydration and drying of the sludge in step (1) can be achieved by selecting a sludge dewatering machine or a mechanical dehydration device. Step (3) The liquid and gas products produced by microwave medium-temperature carbonization are burned by a burner to generate high-temperature flue gas, and the high-temperature flue gas passes through a low-temperature baking reac...

Embodiment 2

[0039] A method for grading and directional pyrolysis sludge carbonization, comprising the following steps:

[0040] (1) Dehydration and drying: the sludge is dehydrated to a sludge with a moisture content of 40% to 60%;

[0041] (2) Low-temperature baking: the sludge dehydrated and dried in step (1) is subjected to low-temperature baking treatment at 300° C. for 2 hours;

[0042] (3) Medium-temperature carbonization: the solid product obtained in the step (2) low-temperature baking treatment is heated to 600° C. by microwaves for 0.8 hours of medium-temperature carbonization to obtain sludge carbon.

[0043] The sludge carbon specific surface area produced by this example is 51.36m 2 / g, carbon content 16.75%.

Embodiment 3

[0045] A method for grading and directional pyrolysis sludge carbonization, comprising the following steps:

[0046] (1) Dehydration and drying: the sludge is dehydrated to a sludge with a moisture content of 40% to 60%;

[0047] (2) Low-temperature baking: the sludge dehydrated and dried in step (1) is subjected to low-temperature baking treatment at 350° C. for 3 hours;

[0048] (3) Medium-temperature carbonization: the solid product obtained in the step (2) low-temperature baking treatment is heated to 800° C. by microwave for 1 hour of medium-temperature carbonization to obtain sludge carbon.

[0049] The sludge carbon specific surface area produced by this example is 49.32m 2 / g, carbon content 17.02%.

[0050] Compared with the sludge carbon produced by the classification and directional pyrolysis sludge carbonization method proposed by the present invention and the sludge carbon obtained in the prior art, the sludge carbon obtained by the present invention has an enla...

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Abstract

The invention discloses a directional staged pyrolysis and carbonization method for sludge. The method comprises following steps: (1), dewatering and drying: the sludge is dewatered until water content is 40%-60%; (2), low-temperature baking: the sludge dewatered and dried in the step (1) is subjected to low-temperature baking treatment at the temperature of 200-350 DEG C; (3), medium-temperature carbonization: solid products obtained through low-temperature baking treatment in the step (2) are subjected to microwave heating to reach 500-800 DEG C for medium-temperature carbonization, and sludge carbon is obtained. The sludge is wholly heated with microwaves, so that the problem of uneven heating of materials in an amplification process due to the fact that a heating source drives heat exchange by temperature difference between materials in traditional heating mode is solved.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of waste treatment and resource utilization, and in particular relates to a carbonization method of graded and directed pyrolysis sludge. [0003] Background technique: [0004] With the improvement of sewage treatment capacity, the amount of sludge has also increased significantly. According to the "2013-2017 China Sludge Treatment and Disposal In-depth Research and Investment Strategic Planning Analysis Report", by 2015, my country's annual sludge output will reach about 198 million tons, becoming the world's largest sludge producer. At present, foreign sludge disposal measures are mainly landfill and incineration, among which landfill is gradually abandoned due to site restrictions and potential safety hazards. Incineration has always been relatively high due to problems such as investment, high operating costs, environmental safety and carbon emissions. Big controversy. From the perspective of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C02F11/10C02F11/12C02F11/14
CPCY02W10/40C10B53/00C02F11/10C02F11/12C02F11/14
Inventor 赵增立王小波郑安庆钟惠琼李海滨
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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