Device and method for preparing hydrogen through coal/biomass chemical-looping gasification

Abstract

The invention discloses a device and a method for preparing hydrogen through coal / biomass chemical-looping gasification. According to the method, coal / biomass particles enter from the upper portion ofa moving bed gasification furnace, and are mixed with a circulating bed material containing calcium oxide and ferric oxide, water vapor is introduced into the gasification furnace, and pyrolysis andgasification reaction are performed to generate synthesis gas; the water vapor as an ejection gas flow enters a steam reactor along with the gasified coke and the bed material particles, and hydrogenis generated through a joint reaction with the water vapor in the steam reactor; the bed material enters an air reactor and is oxidized or decomposed, and the oxidized material or decomposed materialenters the gasification furnace again; hydrogen, carbon dioxide and nitrogen can be obtained from gas separated out of two cyclone separators; and the bed material particles continuously participate in an oxidation reduction or carbonization decomposition reaction and are recycled. The device is simple in structure, convenient to operate, scientific in process raw material, easy in raw material obtaining, low in cost, high in carbon utilization efficiency, less in pollutant and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by coal / biomass gasification, in particular to a device and method for preparing hydrogen by coal / biomass chemical chain gasification. Background technique [0002] Hydrogen is considered to be one of the best clean energy sources in the 21st century, and it is also a good substitute for the existing carbon-containing energy systems such as coal, oil and natural gas. It not only has the advantages of high calorific value during combustion, but the water produced after combustion is also harmless to the environment, making it an ideal clean energy source in the future. However, the characteristics of my country's fossil energy reserves are "rich in coal, poor in oil, and low in gas", and my country's primary energy consumption will be dominated by coal for a long time to come. Therefore, how to efficiently and cleanly produce hydrogen on a large scale and actively develop solid fuel co...

AI Technical Summary

Problems solved by technology

However, the realization of chemical chain technology requires the design of corresponding reaction flow devices. Circulating fluidized bed is the most common reaction device (CN106220461, CN106244241, CN 105222129, CN102425788), but it is not suitable for the direct hydrogen production process of coal / biomass conversion

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