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Method for co-producing biogas-oil-carbon by coupling anaerobic fermentation of kitchen waste with straw pyrolysis

A technology for anaerobic fermentation and kitchen waste, applied in fermentation, preparation of liquid hydrocarbon mixture, petroleum industry, etc., can solve the problems of incomplete treatment of organic waste, ineffective utilization, low methane purity, etc. The effect of large-scale promotion and utilization, realization of resource utilization, and improvement of biogas yield and concentration

Pending Publication Date: 2021-12-07
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single anaerobic fermentation technology cannot completely treat organic waste, and the biogas residue obtained will form secondary pollution. The purity of methane in the synthesis gas generated by a single pyrolysis technology is not high, while the organic acids and aldehydes in the pyrolysis Components such as ketones and ketones have not been effectively utilized

Method used

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  • Method for co-producing biogas-oil-carbon by coupling anaerobic fermentation of kitchen waste with straw pyrolysis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Process such as figure 1 shown;

[0041] The food waste is crushed, and then sent to the anaerobic fermentation reactor for anaerobic fermentation reaction to generate biogas, biogas residue and biogas slurry; the solid mass content of the food waste is 28%; the temperature of the anaerobic fermentation reaction is 30~ 40°C for 35 days;

[0042] The biogas residue and biogas slurry are discharged from the anaerobic fermentation reactor, and after solid-liquid separation, the biogas slurry is mixed with the crushed food waste, and enter the anaerobic fermentation reactor together; the biogas slurry and the crushed food waste The mixing ratio is 1:2 by mass ratio;

[0043] Mix biogas residue and straw, crush, dry and remove water, and then put it into a pyrolysis reactor to generate synthesis gas, pyrolysis liquid and biochar through pyrolysis reaction; the mixing ratio of biogas residue and straw is 1:2 by mass ; The temperature of the pyrolysis reaction is 700°C, and...

Embodiment 2

[0050] Method is with embodiment 1, and difference is:

[0051](1) The solid mass content of kitchen waste is 39%; the anaerobic fermentation reaction time is 25 days;

[0052] (2) The mixing ratio of biogas slurry and crushed kitchen waste is 1:3 by mass ratio;

[0053] (3) The mixing ratio of biogas residue and straw is 1:3 by mass; the temperature of pyrolysis reaction is 600°C, and the time is 2h;

[0054] (4) The amount of biochar added is 15g per liter of kitchen waste in the anaerobic fermentation reactor;

[0055] (5) The amount of the small molecule solution added is 2g per liter of kitchen waste in the anaerobic fermentation reactor;

[0056] Biogas yield was 75%.

Embodiment 3

[0058] Method is with embodiment 1, and difference is:

[0059] (1) The solid mass content of kitchen waste is 22%; the anaerobic fermentation reaction time is 40 days;

[0060] (2) The mixing ratio of biogas slurry and crushed kitchen waste is 1:1 by mass ratio;

[0061] (3) The mixing ratio of biogas residue and straw is 1:1 by mass; the temperature of pyrolysis reaction is 800°C, and the time is 1h;

[0062] (4) The amount of biochar added is 20g per liter of kitchen waste in the anaerobic fermentation reactor;

[0063] (5) The amount of the small molecule solution added is 1g per liter of kitchen waste in the anaerobic fermentation reactor;

[0064] The biogas yield is 80%.

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Abstract

The invention provides a method for co-producing biogas-oil-carbon by coupling anaerobic fermentation of kitchen waste with straw pyrolysis. The method comprises the following steps of: (1) crushing the kitchen waste, and performing anaerobic fermentation reaction; (2) discharging biogas residues and biogas slurry, performing solid-liquid separation, and returning the biogas slurry; (3) mixing and crushing the biogas residues and straws, drying, and performing pyrolysis reaction to generate synthesis gas, pyrolysis liquid and biochar; (4) introducing the synthesis gas into an anaerobic fermentation reactor; (5) discharging the pyrolysis liquid and the biochar from a pyrolysis reactor, performing solid-liquid separation, and adding the biochar into the anaerobic fermentation reactor; and (6) performing oil-water separation on the pyrolysis liquid, adding a water phase into the anaerobic fermentation reactor, and collecting an oil phase. The anaerobic fermentation reaction process of the method provided by the invention has the functions of organic matter anaerobic fermentation, biogas in-situ purification and anaerobic biological methanation of the synthesis gas, so that the yield and concentration of biogas are effectively improved, a high value-added gas-oil-carbon product is obtained, and zero waste emission of the system is realized.

Description

technical field [0001] The invention belongs to the technical field of energy utilization of organic solid waste, and in particular relates to a method for anaerobic fermentation of kitchen waste coupled with pyrolysis of straw to co-produce biogas-oil-charcoal. Background technique [0002] With the rapid development of society and human activities, a large amount of organic waste is produced. How to properly dispose of these organic wastes, realize the diversification of energy supply, and at the same time obtain high value-added products, has attracted more and more attention. For some organic wastes with high organic matter content, such as kitchen waste, anaerobic fermentation technology is usually used to produce biogas to promote the reduction, stabilization and harmlessness of organic waste, and realize energy recycling. Synthesis gas, pyrolysis liquid and biochar can be obtained by pyrolysis and gasification of organic waste. The volume energy density of synthesis g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C10G1/00C01B32/05
CPCC12P5/023C10G1/00C01B32/05Y02E50/30
Inventor 张万里刘平邢万丽李润东杨天华
Owner SHENYANG AEROSPACE UNIVERSITY