Process and system for recycling carbon nano material and hydrogen from urban organic wastes

Abstract

The invention discloses a process for recycling a carbon nano material and hydrogen from urban organic wastes. The process for recycling the carbon nano material and the hydrogen from the urban organic wastes comprises anaerobic fermentation and catalytic cracking. The invention further discloses a system for recycling the carbon nano material and the hydrogen from the urban organic wastes. According to the process for recycling the carbon nano material and the hydrogen from the urban organic wastes, an anaerobic fermentation technology and a methane catalytic cracking technology are organically combined for the first time; biomethane produced by anaerobic fermentation of urban sewage and wastes is adopted; as the treatment of the urban sewage and wastes is non-gratuitous, the use of an additional product (the biomethane) obtained by the treatment of the urban sewage and wastes can greatly reduce the catalytic cracking cost, and low-price raw materials are provided for methane catalytic cracking.

Description

technical field [0001] The invention relates to a process and system for preparing carbon nanomaterials and hydrogen, in particular to a process and system for recovering carbon nanomaterials and hydrogen from urban organic waste. Background technique [0002] The commonly used methane hydrogen production processes are: methane steam reforming and partial oxidation hydrogen production. [0003] The raw material for steam reforming of methane to produce hydrogen is natural gas. Catalytic reforming of methane to hydrogen is economically feasible, and more than 90% of hydrogen in the United States is produced by steam reforming of methane. The ways to produce hydrogen by steam reforming of methane are: steam reforming of methane, water gas replacement reaction and hydrogen purification. The reaction for steam reforming of methane is: [0004] CH 4 +H 2 O→3H 2 +CO [0005] The most suitable reaction conditions are a high temperature of 700-850° C. and a pressure of 0.3-2....

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Problems solved by technology

[0016] (1) Catalytic cracking of methane itself is a new technology. Chemical engineers who specialize in the research of catalytic cracking are not very familiar with the research on the production of methane by anaerobic fermentation process in the field of environmental engineering, and are not clear about the availability of biomethane;

[0017] (2) The anaerobic fermentation process needs to be operated at 35-40 degrees Celsius, so it has high energy consumption requirements. Generally, the biomethane produced by anaerobic fermentation is burned on the spot to meet the energy demand of the anaerobic fermentation process, which cannot be used as catalytic cracking

Therefore, in order to realize the application of the combined process of anaerobic fermentation and catalytic cracking, it is necessary to cultivate a stable community of methanogens in the anaerobic fermenter. may be insufficient

[0019] (4) The biogas produced by anaerobic fermentation not only contains methane, but also contains CO 2 If the gas is directly sent to the catalytic cracker without purification, although it will not affect the production of carbon nanomaterials, it will not be able to produce high-purity hydrogen at the same time, making it difficult to achieve the purpose of hydrogen production

In recent years, the production of hydrogen by methane catalytic cracking technology has received extensive attention and research worldwide. However, this process is still in the research and development stage, and the industrialized simultaneous hydrogen production and carbon nanomaterials of methane catalytic cracking have not been formed. production line

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