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A high-value utilization method of carbon dioxide in biogas

A biogas, high-value technology, applied in the field of utilization of carbon dioxide in biogas, can solve problems such as the failure to achieve CO2 recycling

Inactive Publication Date: 2011-12-28
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] It can be seen that the CO in the biogas in the above method 2 The removal of CO is mainly based on adsorption, but not CO 2 recycling

Method used

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  • A high-value utilization method of carbon dioxide in biogas
  • A high-value utilization method of carbon dioxide in biogas

Examples

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Embodiment 1

[0035] Example 1: Anaerobic fermentation and CO with energy grass as raw material2 High Value Utilization System

[0036] (1) Pretreatment of energy grass: the energy grass after mowing is crushed with a crusher so that the length of the raw material is between 1-2 cm, and the crushed raw material is treated with 2% concentration of alkali at 50°C for 6 hours, and the alkali method It can neutralize the acid produced in the acid production stage, adjust the pH of the raw material solution to about 7.0, and avoid acid inhibition caused by excessive acid accumulation to a certain extent.

[0037] (2) Anaerobic fermentation: the pretreated raw materials are fed into the reactor through a screw feeding method, and the anaerobic fermentation is carried out by adopting the method of medium temperature continuous feeding and continuous discharging, and the temperature of the anaerobic fermentation is 35-55°C. Ammonium bicarbonate is added as a pH buffer, the pH is controlled at 7.0-7...

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Abstract

The invention provides a high-value utilization method of CO2 in biogas. After the pretreated raw material is anaerobically fermented, a mixed gas with CO2 and CH4 as the main components is produced, and the mixed gas is transported to the photobioreactor, and the algae in the photobioreactor use the CO2 in the mixed gas as the fuel needed for growth. Carbon source and energy, while the algae attached to the bioanode in the autotrophic microbial fuel device output the electrons generated by respiratory metabolism to the air cathode through an external circuit, and react under the action of a catalyst to generate current, which can be used for Lighting system power required for photobioreactors. Algae can be further utilized as raw materials for anaerobic fermentation or for extracting high value-added substances. The utilization of biogas through photobioreactor and microbial fuel cell reduces the CO2 content and increases the CH4 content. The invention improves the energy conversion efficiency of the whole system.

Description

technical field [0001] The invention relates to the utilization of carbon dioxide in biogas, especially the algae absorption and utilization of carbon dioxide and the resource circulation and energy transformation fields of self-supporting biofuel cell electricity production. technical background [0002] The methane content in the biogas composition is 55%-70%, and the carbon dioxide content is 28%-44%. By removing CO 2 Can increase the energy value per unit volume of gas, in addition, remove CO 2 It can also improve the quality of biogas and be used as methane vehicle fuel. Currently, CO removal from biogas 2 There are 4 different processes commonly used in industry to make biogas meet the standard of automobile fuel or meet the quality standard for input into natural gas grid. [0003] (1) Washing process [0004] Because CO 2 and H 2 The solubility of S in water is greater than that of methane, so washing with water can not only remove CO 2 can also remove H 2 S...

Claims

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Application Information

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IPC IPC(8): C10L3/10H01M8/16C12P1/00C12P5/02
CPCY02E50/343Y02E60/527Y02E50/30Y02E60/50Y02P70/50
Inventor 李连华孙永明李东孔晓英袁振宏王忠铭杨改秀
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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