Process for producing hydrogen by combining biomass gasification in circulating fluidized bed with H2 adsorption enhanced water vapor transformation

Abstract

The invention provides a process for producing hydrogen by combining biomass combustion gasification and furnace internal calcium spraying in a circulating fluidized bed with H2 in-situ adsorption enhanced water vapor transformation. The process comprises the following steps: gradually enlarging a conical circulating fluidized bed of a hearth, and enabling biomass to carry out partial air combustion at the bottom of the circulating fluidized bed; releasing heat for water vapor gasification of most biomass raw materials; moreover, spraying quicklime into the furnace for catalytic synergism, enabling synergic gas generated by the circulating fluidized bed to enter a moving-bed reactor, and carrying out H2 in-situ adsorption enhanced water vapor transformation reaction to produce hydrogen at the temperature of 250 to 350DEG C; at the same time, adsorbing produced hydrogen and storing the adsorbed hydrogen in a hydrogen absorption material; separating the hydrogen absorption material for regenerating to release pure hydrogen; arranging a water vapor transformation moving bed reactor, a solid separator, a regenerator and a solid mixer for H2 adsorption enhanced water vapor transformation, and enabling a water vapor transformation catalyst and the hydrogen absorption material for adsorbing H2 to continuously and simultaneously move, react and regenerate, so as to obtain pure hydrogen with the content of 100 percent.

Description

technical field [0001] The invention relates to a chemical field, in particular to biomass circulating fluidized bed gasification combined with H 2 Adsorption enhanced water vapor shift hydrogen production. Background technique [0002] The process of producing hydrogen from a large amount of solid fuel includes: raw material gasification, CO water vapor shift, pressure swing adsorption and waste heat recovery, etc. Limited by the thermodynamic equilibrium of the reversible CO water vapor shift reaction, the general conversion rate and selectivity of hydrogen production are not high, and the purity of hydrogen gas is very low. The hydrogen gas with low purity needs to be separated and purified by subsequent products. will product H 2 Purified to more than 99%, but the process is complicated and the technical price is extremely expensive. Cheap hydrogen production is a huge challenge for the development of hydrogen energy. The innovation of suitable raw materials and core ...

AI Technical Summary

Problems solved by technology

CO 2 Although the method of in-situ adsorption enhanced hydrogen production can obtain high-purity hydrogen, due to the adsorption of CO by the adsorbent 2 Due to the limitation of capacity, hydrogen with a purity of more than 99% cannot be obtained, and the separation process of pressure swing adsorption is still required, which does not involve hydrogen compression, storage and other issues

[0010] In addition, the cost of hydrogen production in the traditional way is getting higher and higher in the world, especially the separation and purification, which consumes a lot of energy and cost

Images