Renewable energy (biogas) hydrogen production technology

Source: B&R Working Committee

Applicating Company

Grandblue Environment Co., Ltd.

Technology Name

Technical principle

The essence of the biogas hydrogen production process is hydrogen production by natural gas reforming, desulfurization and decarbonization purification in the front stage, conversion in the middle stage, and pressure swing adsorption purification in the back stage. The hydrogen production process is mature and reliable. 70% of the hydrogen production processes in the world's natural gas hydrogen production use steam reforming to produce hydrogen, and natural gas is used as raw material to produce industrial hydrogen. Both domestic and foreign believe that the steam reforming method is the best Program.

Scope of application

By recycling kitchen waste, producing biogas, producing hydrogen from biogas, and applying hydrogen to the waste recycling and transshipment business of hydrogen fuel cell vehicles, a replicable and recyclable application model is formed. At the same time, the hydrogen produced can also be used in urban transportation (such as buses), industrial production and energy systems, which not only improves the resource utilization of kitchen waste, but also achieves the effect of energy saving and emission reduction.

Process flow and description

The biogas inlet pressure is 1.2kPa, the inlet temperature is ~40℃, the methane content is 60.5%, the carbon dioxide content is 38%, and the H2S content is 0.2%; The raw gas is pressurized by the blower and then enters the wet desulfurization system, where the H2S is removed to below 50ppm. The desulfurized biogas is pressurized to 0.3MPa and enters the PSA-CO2 section of the device. The concentrated CH4-rich gas is obtained by pressure swing adsorption, which is converted into the hydrogen production section. In the reforming section, CH4 and water vapor undergo a reforming reaction to generate hydrogen-rich gas, which enters into pressure swing adsorption after heat exchange, cooling, separation and other sections; The qualified product hydrogen is obtained at the top of the adsorption tower through pressure swing adsorption purification, and the desorbed gas is released at the bottom of the tower, which is converted into the hydrogen production section as fuel after buffering and pressure stabilization. Part of the product hydrogen is pressurized to 20MPa by the compressor to fill the long-tube trailer, and part of it is transported to the hydrogen refueling station customer through the pipeline.

Promotion prospects

Using renewable energy (biogas) hydrogen production technology to break the constraints of incomplete industrial chain on the development of hydrogen energy industry Harmless treatment of by-product biogas - biogas hydrogen production - hydrogen refueling at hydrogen refueling stations - hydrogen for food waste collection and transportation vehicles" cycle, forming a replicable green hydrogen "production-add-use" whole industry based on municipal waste chain mode. Relying on the biogas generated by the anaerobic fermentation of kitchen waste, and adopting the hydrogen production technology of steam reforming after desulfurization and decarbonization, the whole process from the acquisition of biogas raw materials to the hydrogen production does not increase carbon emissions, and the hydrogen production from renewable energy is realized. The hydrogen produced is Green hydrogen. At the same time, the hydrogen production + hydrogen refueling integrated station reduces the cost of hydrogen transportation and has a good demonstration effect in the hydrogen refueling station industry.