Process for simultaneous removal of carbon dioxide and sulfur oxides from flue gas
OwnerLubo Zhou, Dennis J. Bellville +1inventors
InventorsLubo Zhou, Dennis J. Bellville, Edward P. Zbacnik
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Abstract
A process is provided for the simultaneous removal of carbon dioxide and sulfur oxides from a flue gas stream by a potassium carbonate solvent. As a part of the regeneration of the contaminated stream, a portion of that stream is removed and cooled to allow for filtration of potassium sulfate, the reaction product of the solvent and the sulfur oxides.
Claims6
A process of simultaneously reducing carbon dioxide (CO2) and sulfur oxide (SOx) emissions from flue gases produced by combustion of carbon-containing matter, said method comprising the steps of:
- a) sending said flue gas to an absorber unit to be contacted with a potassium carbonate solution to remove CO2 and SOx to produce a treated gas and a rich stream of potassium carbonate solvent containing said CO2 and SOx and K2SO4 produced by reaction of said potassium carbonate solution and said SOx;
- b) sending said rich stream to a stripper to remove said CO2 from said rich stream of potassium carbonate solvent and to produce a partially rich solvent stream containing K2SO4;
- c) removing a portion of said partially rich solvent stream;
- d) removing said K2SO4 from said partially rich solvent stream by cooling said partially rich solvent stream to a temperature at which said K2SO4 will precipitate from said portion of said rich solvent stream to produce a lean solvent stream;
- and
- e) returning said lean solvent stream to said potassium carbonate solution.
In a process for recovering CO2 from a flue gas containing CO2 and SOx wherein the flue gas is contacted with a potassium carbonate solution, the CO2 and SOx components absorbed therein to form a rich solvent stream containing KHCO3 and K2SO4, and the CO2 removed from the said rich solvent stream to produce a partially rich solvent stream, the improvement which comprises:
- a) removing a portion of said partially rich solvent stream;
- b) removing said K2SO4 from said partially rich solvent stream by cooling said partially rich solvent stream to a temperature at which said K2SO4 will precipitate from said portion of said partially rich solvent stream to produce a lean solvent stream;
- and
- c) returning said lean solvent stream to said potassium carbonate solution.
Dependencies are inferred from the claim text.