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a co 2 A method of synergistic gasification of sludge with sub/supercritical water

A technology of supercritical water and synergistic effect, applied in the field of resources and environment, can solve the problems of low pyrolysis gasification rate, lower gasification gas calorific value, and lower gasification gas calorific value, so as to improve gasification efficiency, Efficient recovery and yield improvement effects

Active Publication Date: 2020-07-24
SHENZHEN UNIV
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Problems solved by technology

[0013] However, because sludge is a kind of biomass with high water content, the pyrolysis gasification process requires high water content of sludge, and the dehydration of sludge needs to consume a lot of energy, and the pyrolysis gasification rate is not high , will also produce a large amount of tar (30%-40%) and carbon residue
In the process of gasifying sludge with air, a large amount of nitrogen enters the reaction system, which dilutes the concentration of combustible gas, reduces the calorific value of gasification gas, and reduces the gas output of methane in the gas, and the calorific value of methane is large. The calorific value of the gas is reduced, so the gasification efficiency is reduced

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  • a co <sub>2</sub> A method of synergistic gasification of sludge with sub/supercritical water
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  • a co <sub>2</sub> A method of synergistic gasification of sludge with sub/supercritical water

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[0034] The preferred embodiments of the present invention will be further described in detail below.

[0035] a CO 2 A method for synergistically gasifying sludge with sub / supercritical water, comprising the following steps:

[0036] Step S1, put the remaining sludge produced by the urban sewage plant into the reaction kettle, and purge it with carbon dioxide for 5 minutes to remove impurity gases; then pass it into a carbon dioxide environment of 0-8MPa and keep the pressure for 5-15 minutes;

[0037] Step S2, heating the reactor until the target temperature is 350°C-460°C, the pressure reaches 8MPa-26MPa, and the sludge is gasified in the carbon dioxide-supercritical water system.

[0038] In step S2, CO in the reaction device 2 The ratio of the amount of substance to water is 1:3-20.

[0039] Sludge with different water content was used for CO 2 Co-processing with sub / supercritical water and using N 2 Replace CO 2 Corresponding experiments were carried out to obtain the...

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Abstract

The invention provides a method for gasifying sludge through a synergistic effect of CO2 and sub / super-critical water. The method comprises the following steps that S1, the sludge is placed in a reaction device, the CO2 is introduced into the reaction device, so that the inside of the reaction device is a carbon dioxide environment, and pressure maintaining is conducted at the pressure of 0-8 MPa; S2, the reaction device is heated, so that the temperature in the reaction device is higher than or equal to 350 DEG C, and the pressure is 8 MPa or above, so that the sludge is gasified in a carbon dioxide-super-critical water system. By adopting the technical scheme, greenhouse gas carbon dioxide is recycled while the harmful solid waste sludge is treated, a large amount of available biogas and bio-oil are generated, the gasification rate of the sludge and yield of synthesis gas are increased, the gasification efficiency is improved, and sludge biomass resources are efficiently recycled.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a CO 2 A method for synergistic gasification of sludge with sub / supercritical water. Background technique [0002] Municipal sludge is a by-product produced in the process of sewage treatment. As the domestic sewage treatment volume in my country increases year by year, the amount of residual sludge also increases rapidly. Sludge contains a large amount of organic matter, with a dry weight organic matter content of 30-70%. Traditional disposal methods such as landfill, composting, and incineration not only have a low utilization rate of organic matter, but also produce secondary pollution. Therefore, the gasification technology with high organic matter utilization rate and low secondary pollution has attracted much attention. According to the classification of biomass gasification agents, the existing gasification technologies mainly include pyrolys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/00C02F11/10
CPCC02F11/10C10J3/00C10J2300/0923C10J2300/0969C10J2300/0973Y02P20/54
Inventor 马睿孙世昌方琳胡亚平林俊豪李桐廖钦雄
Owner SHENZHEN UNIV
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