Process for preparing hydrogen from deoiled asphalt employing combustion gasification and CO2 in-situ adsorption-enhanced water-gas shift reaction in in-furnace calcium-spraying circulating fluidized bed

Abstract

The invention discloses a process for preparing hydrogen from deoiled asphalt employing combustion gasification and CO2 in-situ adsorption-enhanced water-gas shift reaction in an in-furnace calcium-spraying circulating fluidized bed. The process comprises the following steps: gradually expanding a conical circulating fluidized bed of a hearth, carrying out partial air combustion on the deoiled asphalt on the lower part of the circulating fluidized bed, releasing heat for water vapor gasification on most of deoiled asphalt material; spraying a limestone desulfurization agent into a furnace, and carrying out desulfurization in a circulating fluidized bed furnace; feeding a synthesis gas generated by the circulating fluidized bed into a moving bed reactor; carrying out CO2 in-situ adsorption-enhanced water-gas shift reaction to prepare hydrogen; setting a water-gas shift moving bed reactor and a regenerator through the adsorption-enhanced water-gas shift reaction, so that successive and simultaneous movement, reaction and regeneration of an NiO / Al2O3 catalyst and an CaO adsorbent of adsorbing CO2 are carried out. By virtue of coupling of successive catalytic water-gas shifting and CO2 in-situ adsorption separation processes and enhanced water-gas shifting for heat and mass transfer, a high-purity hydrogen product can be continuously prepared by the synthesis gas from the circulating fluidized bed at 450-600 DEG C.

Description

technical field [0001] The invention relates to a kind of calcium spraying circulating fluidized bed combustion gasification CO in a heavy oil residue furnace 2 In-situ adsorption enhanced water-vapor shift hydrogen production process, more specifically, is a special use of heavy oil residue as raw material, partial combustion of circulating fluidized bed, gasification, calcium spraying and desulfurization in the furnace to generate synthesis gas, and the synthesis gas is coupled CO 2 In-situ adsorption strengthens the water-vapor shift reaction and continuously produces high-purity hydrogen at normal pressure and (450-600) °C temperature range. Background technique [0002] The heavy oil residue comes from the catalytic oil gas production unit. It is a light and heavy mixed residual oil obtained after catalytic cracking of heavy oil. The main element is carbon, and the rest are hydrogen, oxygen, nitrogen, sulfur and other impurity elements. Heavy oil residue gasification ...

AI Technical Summary

Problems solved by technology

Our many years of research have shown that: due to the water vapor shift reaction of CO 2 Adsorption enhancement effect, CO disproportionation or further oxidation to CO 2 The conversion rate will be very low, CO 2 It can only be derived from hydrogen production products. We disclosed the hydrogen production process of glycerol adsorption enhanced reforming in patent ZL201010248222.7, but it is only applicable to gas-liquid raw materials, and the purpose of hydrogen production cannot be achieved for solid raw materials.

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