A method and device for producing hydrogen-rich gas by high-temperature steam gasification of biomass

Abstract

The invention discloses a method and device for producing hydrogen-rich fuel gas by high-temperature steam gasification of biomass. It uses pure water vapor as the gasification medium under the condition of no catalyst, and superheats the water vapor to above 900°C. , using a constant flow pump and steam generator to control, adjust and meter the amount of water vapor added to the high-temperature gasification reactor, and carry out high-temperature steam gasification reaction in the fixed-bed gasification reactor at 900-1050 °C. Under appropriate process conditions such as reaction temperature, water vapor flow rate, raw material particle size, and reaction time, hydrogen-rich gas with high calorific value can be produced. The calorific value of the hydrogen-rich gas prepared by this method is 11-14MJ / Nm3, and the hydrogen content is above 45%-51%. It has the advantages of not using any catalyst; obtaining hydrogen-rich gas with high calorific value, improving energy utilization efficiency; converting low-quality biomass energy into high-quality hydrogen energy, etc.

Description

technical field [0001] The invention relates to biomass gasification technology, in particular to a method and device for preparing hydrogen-rich gas by high-temperature steam gasification of biomass. Background technique [0002] Hydrogen combustion products are non-polluting to the environment; high calorific value (143 MJ / kg, about 3 times that of gasoline, 4.5 times that of coke); used as a low-temperature fuel cell will not produce NO X and CO 2 ; It can be economically and effectively stored and transported; it is a safe energy source, and there is no long-term follow-up damage in an unknown range. At present, 96% of hydrogen comes from the high temperature steam reforming reaction of fossil fuels, of which natural gas is the most important raw material accounting for 48%, followed by heavy oil and naphtha accounting for 30%, and coal accounting for 18%. Hydrogen production from fossil fuels not only consumes a large amount of non-renewable resources, but also pollut...

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Problems solved by technology

[0005] In order to solve the problems existing in the prior art when using air, oxygen, etc. as the gasification medium, the gasification process is complex and the equipment investment is large, the present invention provides a method for producing hydrogen-rich gas by high-temperature steam gasification of biomass and With its device, the hydrogen-rich gas produced has high hydrogen content, low tar content, high calorific value and clean

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