Configurations and methods of high pressure acid gas removal
First Claim
1. A method of regenerating a CO2-depleted physical solvent from a CO2-rich physical solvent that is formed in a CO2 absorber by absorption of CO2 from a gas having a CO2 content of at least 10 mol % and a pressure of at least 1000 psig, comprising a step of heating the CO2-rich solvent to a temperature of at least 100°
- F. using heat from flash-regenerated lean solvent and heat recovered from at least one of a feed gas, and a compressor discharge, wherein the heated CO2-rich solvent is flashed to so form the CO2-depleted physical solvent.
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Accused Products
Abstract
Acid gas is removed from a feed gas using a physical solvent that is regenerated using successive flashing stages after heating of the rich solvent using low-level waste heat that is preferably produced or available within the acid gas removal plant. Especially preferred waste heat sources include compressor discharges of the refrigeration system and/or recompression system for CO2, and/or (low level) heat content from the feed gas.
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Citations
20 Claims
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1. A method of regenerating a CO2-depleted physical solvent from a CO2-rich physical solvent that is formed in a CO2 absorber by absorption of CO2 from a gas having a CO2 content of at least 10 mol % and a pressure of at least 1000 psig, comprising a step of heating the CO2-rich solvent to a temperature of at least 100°
- F. using heat from flash-regenerated lean solvent and heat recovered from at least one of a feed gas, and a compressor discharge, wherein the heated CO2-rich solvent is flashed to so form the CO2-depleted physical solvent.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of removing CO2 from a feed gas, comprising:
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absorbing in a CO2 absorber CO2 from the feed gas using a lean physical solvent to produce a treated gas depleted in CO2 and a CO2-rich solvent; heating the CO2-rich solvent to a temperature of at least 100°
F. in a plurality of heat exchangers using waste heat that is produced in the process of removing CO2 from the feed gas;separating a first CO2-rich stream from the heated CO2-rich solvent at a pressure of at least 300 psig, and separating a second CO2-rich stream from the heated CO2-rich solvent at a pressure of at least 100 psig to so form a flashed solvent, wherein first and second CO2-rich streams comprise at least 70% of total CO2 of the CO2-rich solvent; and cooling the flashed solvent using refrigeration generated by partial expansion of the CO2-rich solvent. - View Dependent Claims (11, 12, 13, 14)
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15. An acid gas removal plant, comprising:
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a source of a feed gas that is configured to provide a feed gas having a pressure of at least 1000 psi and a CO2 content of at least 10 mol %; a CO2 absorber fluidly coupled to the source and configured to allow absorption of CO2 from the feed gas using a lean physical solvent to thereby produce a lean gas stream and a CO2-rich solvent; a plurality of heat exchangers configured to heat the CO2-rich solvent to a temperature of at least 100°
F. using waste heat to thereby form a heated CO2-rich solvent;a plurality of pressure reduction devices and flash vessels arranged such as to allow sequential flashing of the heated CO2-rich solvent such that a first CO2-rich stream is formed from heated the CO2-rich solvent at a pressure of at least 300 psig, and such that a second CO2-rich stream is formed from the heated CO2-rich solvent at a pressure of at least 100 psig; wherein first and second CO2-rich streams comprise at least 70% of total CO2 of the CO2-rich solvent. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification