Method using pressure swing adsorption to purify hydrogen produced from anaerobic fermentation of kitchen garbage

Abstract

The invention discloses a method using pressure swing adsorption to purify hydrogen produced from anaerobic fermentation of kitchen garbage. The method includes: using a reciprocating type two-stage compressor to increase the pressure of dewatered and desulfurized raw material gas to 3.8-4.0MPa and lower the temperature of the dewatered and desulfurized raw material gas to 5-15 DEG C; using the bottom of an absorption tower to absorb hydrogen in the high-pressure and low-temperature mixed raw material gas, and discharging methane and carbon dioxide; desorbing the hydrogen absorbed in absorbent; subjecting an absorption bed to vacuumizing regeneration, and allowing the absorption bed to enter the next absorption cycle; allowing the hydrogen obtained by the desorption to sequentially pass a vacuum tank and an oil-water separator, and using a water ring vacuum pump to pump the hydrogen into a second buffer tank; using a reciprocating type four-stage compressor to increase the pressure and lower the temperature, and performing molecular sieve deep dewatering to obtain the product hydrogen. The method has the advantages that gases such as methane and carbon dioxide can be recycled, and the purification and enrichment degree of the hydrogen reaches more than 99%; the method is suitable for large-scale continuous production, simple and continuous in equipment structure, convenient to operate and capable of reducing energy consumption.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and in particular relates to a method for producing hydrogen by pressure swing adsorption purification by anaerobic fermentation of kitchen waste. Background technique [0002] From the 20th to the 21st century, the world has entered modernization, and there is a crisis of energy shortage in fossil fuels, especially gasoline refined from petroleum, which is the cause of the global oil crisis. The continuous use of fossil fuels by humans is one of the sources of the emission of the greenhouse gas carbon dioxide. Fossil energy is currently the most important energy consumed in the world. In 2006, fossil energy accounted for as high as 87% of the energy consumed in the world, and the proportion of fossil energy consumption in my country was as high as 93%. That is to say, the status of fossil energy in the short term It is difficult to change in time, but with the exploitation of human bein...

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Problems solved by technology

[0004] At present, hydrogen purification technologies mainly include cryogenic separation, membrane separation and pressure swing adsorption (PSA). Among them, the cryogenic separation process has high energy consumption, complicated operation, and large investment, and is suitable for occasions with large processing capacity and low hydrogen requirements; Membrane separation technology has the advantages of low investment and low energy consumption, but there are still difficulties in the selection of membrane materials

In the hydrogen production process of food waste fermentation, the application of PSA technology in the purification process of food waste anaerobic hydrogen production has not been reported at home and abroad.

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