Method and device for producing hydrogen through biomass gasification by using single fluidized bed and two-step method

Abstract

The invention belongs to the field of energy. Biomass is used as a raw material, and is added with catalyst calcium carbonate / magnesium carbonate of a carbonate system to react in a fluidized bed; a biomass gasification process is divided into two processes, namely a biomass burning process and a biomass pyrolysis and gasification process, and the two processes work alternately in turn, wherein the burning process comprises that catalyst calcium carbonate / magnesium carbonate granules are added into the fluidized bed, simultaneously air is supplied to the fluidized bed, the air supply to the furnace is stopped when the temperature of the bed layer is raised to a predetermined temperature, and the burning process is finished; then the biomass burning process turns to the gasification process, namely vapor and biomass are supplied to the fluidized bed to obtain hydrogen-rich gas with extremely low tar content; and after the hydrogen-rich gas is washed and purified by coal gas, the hydrogen-rich gas is converted into H2 and CO2 in a CO conversion device, then the gas is desulfurized and compressed, and the H2 is extracted from the gas in a variable pressure adsorption device. The method achieves that the gasification and burning two processes and the cyclic regeneration of a catalyst are finished in the same fluidized bed gasification furnace, the investment is saved, and the running cost is low.

Description

technical field [0001] The invention belongs to the field of energy, and relates to a method and a device for producing hydrogen by single-fluidized-bed two-step biomass gasification. Background technique [0002] Energy is the material basis for the survival and development of human society. Excessive consumption of fossil resources has caused oil shortages and climate warming, which have become major issues affecting the sustainable development of human society. Finding oil substitutes has become a global consensus. Biomass energy is environmentally friendly and renewable, and will play an important role in meeting future social energy demand, especially transportation fuel demand. Hydrogen is recognized as an ideal future clean energy carrier, and seeking large-scale, clean and cheap biomass hydrogen production technology is an important direction for petroleum fuel replacement. Biomass hydrogen production mainly includes thermochemical processes and biological processes...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the quantity and temperature of the heat carrier, the temperature of the general pyrolysis gasification bed cannot be very high, so the gasification efficiency is low. Susceptible to bed temperature variations and instability, which limit the practicality of twin-bed gasification

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