Carbonation calcination reaction process for CO2 capture using a highly regenerable sorbent

Abstract

A process for the efficient capture of CO2 and sulfur from combustion flue gas streams and gasification based fuel gas mixtures using regenerable and recyclable calcium based sorbents. The regeneration of the calcium sorbent is accomplished by hydrating the sorbent at high temperatures of about 600 DEG C and a pressure higher than 6 bars to lower the parasitic energy consumption.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 61 / 116,172, filed November 19, 2008, the entire contents of which are hereby incorporated by reference. technical field [0003] Exemplary embodiments relate to the removal of pollutants from an exhaust gas stream. More specifically, exemplary embodiments relate to the reactivation of sorbents used to remove pollutants from exhaust gas streams. Background technique [0004] The concept of using lime to capture carbon dioxide has been around for over a century. It was first proposed by DuMotay and Marechal in 1869 for the enhanced gasification of coal using lime, and a century later by CONSOL's CO 2 receiver approach, the concept was tested in a 40 t / day plant. A variant of this method, called the Hypring method, was developed in Japan to produce hydrogen at high pressure. Harrison et al. and Grace et al. also applied the concept to the produc...

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Problems solved by technology

Although this method was found to reduce sintering and reactivate the sorbent, a steady decrease in the reactivity of the sorbent was still observed

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