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High-pressure hydrothermal and circulating fluidized bed pyrolysis-assisted rapid harmless sludge treatment process

A circulating fluidized bed, harmless treatment technology, applied in the field of solid waste resource utilization, can solve the problems of high energy consumption and high energy consumption of pyrolysis, and achieve low energy consumption, comprehensive resource treatment and disposal, and low equipment requirements. Effect

Inactive Publication Date: 2018-06-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to aim at the shortcomings of high energy consumption in the technology of pyrolysis and harmless treatment of sludge, to provide a high-pressure hydrothermal and circulating fluidized bed pyrolysis-assisted sludge rapid and harmless treatment process to overcome the energy consumption of pyrolysis High disadvantages, and achieve complete harmless sludge

Method used

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  • High-pressure hydrothermal and circulating fluidized bed pyrolysis-assisted rapid harmless sludge treatment process
  • High-pressure hydrothermal and circulating fluidized bed pyrolysis-assisted rapid harmless sludge treatment process

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Place 1500g of sludge produced by Beijing Qinghe Sewage Treatment Plant with a moisture content of 80% in a hydrothermal reactor, add 2% Ca(OH) 2 After sealing, nitrogen gas is introduced to ensure the inert atmosphere in the kettle, hydrothermal treatment is carried out at 180°C and autogenous pressure 1.8MPa for 60min, and stirring at 150rpm ensures uniform heat distribution;

[0027] (2) The mixed hydrothermal product obtained in step (1) is mechanically dehydrated and solid-liquid separated, and the moisture content of the solid phase part is 52%. The solid phase product is also called hydrothermal charcoal and dried in an oven at 80 ° C. After drying, The solid sample was crushed to 50-150 mesh with a pulverizer, and the contents of K and Na in the hydrothermal charcoal were reduced by 4% and 30% respectively compared with the original sludge;

[0028] (3) Put the hydrothermal charcoal particles in step (2) in a fluidized bed screw feeder, and carry out pyrolys...

Embodiment 2

[0030] (1) Put 1500g of Qinghe sludge with a moisture content of 80% into a hydrothermal reactor and add 5% Ca(OH) 2 Seal it, feed nitrogen to ensure the inert atmosphere in the kettle, hydrothermally treat at 200°C, self-generated pressure 2.2MPa for 60min, stir at 120rpm to ensure uniform heat distribution;

[0031] (2) The mixed hydrothermal product obtained in step (1) is mechanically dehydrated and solid-liquid separated, and the moisture content of the solid phase part is 42%, and the solid phase product is dried in an oven at 80 ° C, and the dried solid sample is crushed with a pulverizer Grinding to 50-150 mesh, compared with the original sludge, the content of K and Na in the hydrothermal charcoal is reduced by 6% and 33% respectively;

[0032] (3) Place the hydrothermal charcoal particles in step (2) in a fluidized bed screw feeder, and carry out pyrolysis reaction at 500°C, the feed rate is 10g / min, the nitrogen flow rate is 2L / min, and the pyrolysis residue Into t...

Embodiment 3

[0034] (1) Put 1500g of Shandong sludge with a moisture content of 82% into a hydrothermal reactor and add 5% Ca(OH) 2 Seal it, feed nitrogen to ensure the inert atmosphere in the kettle, hydrothermally treat at 220°C, self-generated pressure 2.4MPa for 30min, stir at 150rpm to ensure uniform heat distribution;

[0035] (2) mechanically dehydrating the mixed hydrothermal product obtained in step (1), separating solid and liquid, the moisture content of the solid phase part is 44%, drying the solid phase product at 80°C, and pulverizing it to 50-150 mesh;

[0036](3) Put the hydrothermal charcoal particles in step (2) in the fluidized bed screw feeder, and carry out the pyrolysis reaction at 600°C, the feed rate is 20g / min, the nitrogen flow rate is 3L / min, and the heating rate is At 20°C / min, pyrolytic charcoal enters the collector at the bottom of the fluidized bed, and the tar produced is cooled and collected. The pyrolytic carbon yield was 68%, and the tar yield was 8.5%. ...

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Abstract

The invention relates to a high-pressure hydrothermal and circulating fluidized bed pyrolysis-assisted rapid harmless sludge treatment process. According to the treatment process, Ca(OH)2 is added toenhance the hydrolysis and decarboxylation reactions in a high-pressure hydrothermal sludge pretreatment process, so that the dewatering performance of the sludge is significantly improved, and the cost of sludge pyrolysis pretreatment is lowered; a circulating fluidized bed is high in pyrolysis treatment efficiency and low in energy consumption; the addition of Ca is beneficial to the secondary decomposition of tar during pyrolysis, so that the generation of hazardous waste tar is controlled; furthermore, the pyrolysis process can stabilize the heavy metals in the sludge and effectively decompose the organic pollutants; the pH value of pyrolysis carbon is within a range of 10.6-12.4, so that the pyrolysis carbon can be recovered as an acid contaminated soil improver or adsorbent; the method provided by the invention is energy-saving and efficiency, and realizes the rapid and harmless treatment and resource utilization of the sludge.

Description

technical field [0001] The invention relates to the technical field of harmless treatment and resource utilization of municipal sludge, and belongs to the new technology of solid waste resource utilization in the field of environmental protection and resource comprehensive utilization. technical background [0002] With the rapid advancement of urbanization and the continuous improvement of sewage treatment facilities, the output of urban sludge has continued to increase. In 2015 alone, the output of sludge has reached about 30 million tons. Sewage sludge is enriched with toxic and harmful substances such as organic pollutants, heavy metals, various parasite eggs, pathogenic microorganisms, and radionuclides in sewage. Environmental pollution, damage to ecosystems and potential risks to human health. Traditional sludge treatment methods such as aerobic composting and landfill cannot achieve rapid, safe and harmless sludge treatment due to limitations such as low treatment e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C10B53/00C10B57/00C10B57/10
CPCC10B53/00C10B57/00C10B57/10C02F11/00
Inventor 刘振刚刘婷婷
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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