Method for preparing biochar and hydrogen by utilizing anaerobic fermentation by-products

A technology of anaerobic fermentation and anaerobic fermentation tank, which is applied in the field of preparing biochar and hydrogen by the by-products of anaerobic fermentation, which can solve the problems of difficult industrial production and application, high requirements for process conditions, and high production costs, and achieve a well-developed pore structure, Enhance the mass transfer and heat transfer process, improve the effect of performance

Active Publication Date: 2022-05-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steam reforming hydrogen production technology in this method first vaporizes the biogas slurry at high temperature and normal pressure (500-700°C) and then reforms it to produce hydrogen, and it is accompanied by side reactions that are prone to occur at high temperatures
This method requires high process conditions, and the operation is relatively complicated. The reaction product contains a small amount of harmful gas, and the production cost is high, so it is difficult to apply in industrial production.

Method used

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  • Method for preparing biochar and hydrogen by utilizing anaerobic fermentation by-products
  • Method for preparing biochar and hydrogen by utilizing anaerobic fermentation by-products
  • Method for preparing biochar and hydrogen by utilizing anaerobic fermentation by-products

Examples

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Effect test

Embodiment 1

[0088] A method for preparing biochar and hydrogen by using anaerobic fermentation by-products, using such as figure 1 The process flow shown.

[0089] 1) Coarse crushing of straw: take 500g of natural air-dried corn stalks for coarse crushing, and take straws with a length of about 2cm for use;

[0090] 2) Anaerobic fermentation treatment: take 15kg of inoculation mud (the mass ratio of inoculation mud to straw is 30:1) and mix it with coarsely crushed straw and pour it into the fermenter, pour 10kg of distilled water (the mass ratio of distilled water to straw is 20:1), Stir the mixed materials evenly, submerge the nitrogen pipe into the bottom of the fermenter, and purge for 3 minutes to ensure an anaerobic environment. Leave a biogas outlet on the top of the fermenter, and submerge the gas outlet pipe into the water to prevent air from entering the fermenter. Place the fermenter in an environment of 25°C for 14 days, and stir the fermentation material every 12 hours to pr...

Embodiment 2

[0099] The same raw material and method of the used embodiment 1 of present embodiment, but biogas slurry hydrogen production nickel-based catalyst carrier is CeO 2 . The test data of the specific surface area of ​​the biochar by-product of anaerobic fermentation biogas residues are shown in Table 1, and the components and contents of hydrogen production gas products from biogas slurry are shown in Table 2.

Embodiment 3

[0101] The same raw materials and methods as in Example 1 are used in this example, but the dosage of biogas slurry hydrogen production catalyst is 0.5g, and the temperature of the reactor is raised to 200°C. See Table 1 for the specific surface area test data of biochar by-product biogas residue from anaerobic fermentation, and see Table 2 for the components and contents of hydrogen production gas products from biogas slurry.

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Abstract

A method for preparing biochar and hydrogen by using anaerobic fermentation by-products and biochar produced from biogas residues, the method comprises anaerobic fermentation after mixing straw 1, inoculation mud, and distilled water to obtain a fermented mixed product; from the mixed Separating the fermented straw from the product to obtain straw 2; separating and recovering the biogas slurry from the mixed product; carbonizing the obtained straw 2 to obtain the biochar; pressurizing the obtained biogas to catalyze the reaction and collecting gas, which is the obtained biochar. the hydrogen. The invention has the advantages of simple operation, low cost and environmental friendliness, provides a new path for resource recycling and disposal of by-products of anaerobic fermentation, and provides technical reference for the preparation of high specific surface area biochar from biomass and hydrogen production from biogas slurry. The produced biochar can be used in fields such as improving soil fertility, increasing carbon sinks, reducing emissions, and remediating environmental pollution, with great potential. The hydrogen produced can be used for heating or power generation on site.

Description

technical field [0001] The present invention relates to the field of by-product recycling, energy utilization and environment in the energy conversion process, and more specifically, relates to a method for preparing biochar and hydrogen by using anaerobic fermentation by-products. Background technique [0002] The by-products of anaerobic fermentation are rich in nutrient nitrogen, and are currently used as bio-organic fertilizers to replace some chemical fertilizers, but there is a risk of soil nitrogen exceeding the standard. In addition, the use of anaerobic fermentation by-product fertilizers also has risks such as pathogenic bacteria and heavy metal pollution, odor pollution, dioxin and polychlorinated biphenyl pollution. The anaerobic fermentation project using straw as the substrate only converts part of the cellulose and most of the hemicellulose, leaving a large amount of biogas residue. Biogas slurry is the residual liquid after anaerobic fermentation, and is cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B3/32C01B3/40B01J23/755B01J23/83
CPCC01B32/05C01B3/326C01B3/40B01J23/755B01J23/83C01B2203/0233C01B2203/1252C01B2203/1211C01B2203/06C01B2203/1082C01B2203/1058Y02P20/52Y02E50/30
Inventor 陈冠益郭祥毛雨柔颜蓓蓓张言斌陶俊宇李婉晴程占军马文超
Owner TIANJIN UNIV
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