Purification of carbon dioxide

Abstract

Carbon dioxide is separated from a feed gas, preferably derived from flue gas from an oxyfuel combustion process, in a membrane separation system to produce separated carbon dioxide gas which is fed to the oxyfuel combustion process to improve the performance of the process.

Description

Purification of carbon dioxide Background of the invention The present invention relates to a method and an apparatus for the aerobic combustion of fuels selected from carbonaceous fuels, hydrocarbonaceous fuels and mixtures thereof. The present invention includes a membrane separation system for separating carbon dioxide from a feed gas and using the separated carbon dioxide to enhance the combustion performance of an aerobic combustion process. There is an urgent need to develop a new method to generate electricity from fossil fuels, carbonaceous fuels, or hydrocarbonaceous fuels while capturing carbon dioxide. This new method should ideally be more efficient and cost-effective than existing methods. The combustion process of oxyfuels is considered here. In the oxyfuel combustion process, the fuel is burned in pure oxygen, optionally with recirculation of cooled flue gas, steam or water to control the proper flame temperature. Cooled and water condensed clean flue gas ...

AI Technical Summary

Problems solved by technology

The aim is to get liquid CO2 for sale rather than recovering as much CO2 as possible from the combustion process, so CO2 recovery from feedstock is very low, about 70%

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