Configurations and methods for carbon dioxide and hydrogen production from gasification streams

Abstract

A syngas treatment plant is configured to remove sulfurous compounds and carbon dioxide from shifted or un-shifted syngas in a configuration having a decarbonization section and a desulfurization section. Most preferably, the solvent in the decarbonization section is regenerated and cooled by flashing, while the solvent is regenerated in the desulfurization section via stripping using external heat, and it is still further preferred that carbonylsulfide is removed in the desulfurization section via hydrolysis, and that the so produced hydrogen sulfide is removed in a downstream absorber.

Description

[0001] This application claims priority to the applicant's co-pending US Provisional Application 60 / 891133, filed February 22, 2007. technical field [0002] The technical field is the production of hydrogen and carbon dioxide from syngas streams, particularly arrangements and methods in which sulfur scavengers and solvents are used to reduce carbon and sulfur emissions. Background technique [0003] The gasification of coal, residual oil and other refinery waste is often combined with a combined cycle power plant (IGCC) to generate additional electricity. Syngas from gasification mainly includes H 2 , CO 2 , CO, H 2 S and COS are therefore often treated to remove sulfur where the syngas is used as fuel gas for power plants. While such IGCC plants are quite efficient at upgrading low-grade carbonaceous products to generate electricity, they often generate significant carbon and sulfur emissions, particularly from gas turbine exhaust (e.g., sulfur oxides, CO 2 Wait). [...

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Problems solved by technology

Unfortunately, such a configuration also produces enriched CO 2 acid gas, which is problematic for downstream sulfur plants

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