Multi-stage CO2 removal system and method for processing a flue gas stream
First Claim
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1. A method for removing carbon dioxide from a flue gas stream using a series of absorption stages in which a flue gas stream is contacted with an ionic solution containing ammonia, the series of absorption stages including a first absorption stage and a last absorption stage relative to the flow direction of the flue gas stream, the method comprising:
- controlling a temperature and an ammonia-to-CO2 mole ratio of the ionic solution provided to each stage in the series of absorption stages such that the ionic solution provided to the first absorption stage has a higher temperature and a lower ammonia-to-CO2 mole ratio than the ionic solution provided to the last absorption stage.
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Abstract
An ammonia based CO2 capture system and method is provided in which multiple absorption stages are provided. Each absorption stage delivers an ionic solution at a predetermined temperature and contacts it with a flue gas stream.
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Citations
20 Claims
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1. A method for removing carbon dioxide from a flue gas stream using a series of absorption stages in which a flue gas stream is contacted with an ionic solution containing ammonia, the series of absorption stages including a first absorption stage and a last absorption stage relative to the flow direction of the flue gas stream, the method comprising:
controlling a temperature and an ammonia-to-CO2 mole ratio of the ionic solution provided to each stage in the series of absorption stages such that the ionic solution provided to the first absorption stage has a higher temperature and a lower ammonia-to-CO2 mole ratio than the ionic solution provided to the last absorption stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for removing carbon dioxide from a flue gas stream, the system comprising:
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a series of absorption stages including a first absorption stage and a last absorption stage relative to the flow direction of the flue gas stream, each absorption stage in the series of absorption stages including; a gas-liquid contact mass transfer device; a liquid distribution device; and a solution delivery path configured to deliver a supply of ionic solution to the liquid distribution device, the solution delivery path including a heat exchange device; wherein the solution delivery paths for the first and last absorption stages are configured to provide the first absorption stage with an ionic solution having a lower ammonia-to-CO2 mole ratio than an ammonia-to-CO2 mole ratio of the ionic solution provided to the last absorption stage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification