A kind of device and method for producing hydrogen-rich gas by biomass graded gasification

Abstract

The invention discloses an apparatus for preparing a hydrogen rich gas through grading gasification of biomasses, and a method thereof. The system apparatus mainly comprises a pyrolysis reactor, an oxidation reactor, a regeneration reactor, a gasification reactor, a cyclone separator, a flue gas cooler and a steam generator, wherein the pyrolysis reactor is directly connected with the oxidation reactor, and the gasification reactor is placed in the regeneration reactor of an oxygen carrier. A biomass pyrolysis process, a pyrolysis gas / tar combustion process and a coke gasification process are separately carried out in the invention. Fixed carbon in the biomasses is fully used to displace hydrogen in water steam, and the obtained hydrogen rich gas mainly contains H2 and CO2 and also contains a small amount of CO, so containment of a low carbon hydrocarbon gas in routinely gasified hydrogen rich gas products is avoided, and subsequent purification and utilization is simple; and catalytic oxidation of tar is carried out by using a composite oxygen carrier to realize complete conversion and utilization of the tar, so carbon formation in the tar conversion process is avoided, downstream device faults induced by condensation of tar in the pyrolysis gas are solved, and CO2 trapping is facilitated.

Description

technical field [0001] The invention relates to a method and a device system for producing hydrogen-rich body through hierarchical gasification of biomass, belonging to the field of utilization of biomass resources. Background technique [0002] Hydrogen energy is a clean secondary energy source. Although there are a large number of hydrogen atoms in nature, hydrogen as an energy carrier must be obtained through primary energy conversion. At present, hydrogen is mainly produced through thermochemical conversion of fossil fuels such as natural gas, coal, and petroleum. However, with the shortage of fossil energy and the increasingly severe ecological environment, renewable biomass is used to seek clean, economical and sustainable development. The new technology of hydrogen production has attracted worldwide attention. [0003] Biomass gasification hydrogen production is one of the important ways of biomass thermochemical conversion and utilization, and it is also a green hyd...

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Problems solved by technology

[0009] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a device and method for producing hydrogen-rich gas by staged biomass gasification, so as to solve the problem of the large number of components in the existing biomass gasification products and the problem of tar In view of the problems of high content and difficult conversion and removal, a biomass gasification device and its method for producing tar-free and easy-to-purify hydrogen-rich gas by thermochemical conversion of biomass are proposed

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