Heat integration of a cement manufacturing plant with an absorption based carbon dioxide capture process
AssigneeALSTOM Technology Ltd
InventorsNareshkumar B. Handagama, Rasesh R. Kotdawala, Ajay Vajpeyi
Life of this patent
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Abstract
The present invention relates to methods and systems for improving the utilization of energy in a cement manufacturing plant comprising an absorption based contaminant, e.g. CO2, capture process using thermal regeneration of a liquid absorbent. The methods and systems of the present invention are characterized in that the thermal regeneration of the liquid absorbent is at least partially effected using a hot exhaust gas stream generated in the kiln of the cement manufacturing plant.
Claims18
A method of cleaning an exhaust gas stream generated in a cement kiln, the method comprising:
- a) scrubbing in a scrubbing step a contaminant rich exhaust gas stream with a liquid absorbent such that a contaminant rich liquid absorbent is formed;
- b) cleaning the contaminant rich liquid absorbent by heating it to separate contaminant from the liquid absorbent, such that a contaminant lean liquid absorbent is regenerated;
- and
- c) recycling regenerated contaminant lean liquid absorbent for use in the scrubbing step;
- characterized in that the heating of rich liquid absorbent is at least partially effected using a hot exhaust gas stream generated in the cement kiln.
A method of cleaning an exhaust gas stream generated in a cement kiln, the method comprising:
- a) scrubbing in a scrubbing step a CO2 rich exhaust gas stream with a liquid absorbent such that a CO2 rich liquid absorbent is formed;
- b) cleaning the CO2 rich liquid absorbent by heating it to separate CO2 from the liquid absorbent, such that a CO2 lean liquid absorbent is regenerated;
- and
- c) recycling regenerated CO2 lean liquid absorbent for use in the scrubbing step;
- characterized in that the heating of CO2 rich liquid absorbent is at least partially effected using a hot exhaust gas stream generated in the cement kiln.
A method of cleaning an exhaust gas stream generated in a cement kiln, the method comprising:
- a) scrubbing in a scrubbing step an NH3 rich exhaust gas stream with a liquid absorbent such that an NH3 rich liquid absorbent is formed;
- b) cleaning the NH3 rich liquid absorbent by heating it to separate NH3 from the liquid absorbent, such that an NH3 lean liquid absorbent is regenerated;
- and
- c) recycling regenerated NH3 lean liquid absorbent for use in the scrubbing step;
- characterized in that the heating of the NH3 rich exhaust gas stream is at least partially effected using a hot exhaust gas stream generated in the cement kiln.
A cement manufacturing plant comprising a gas cleaning system for removing contaminants from an exhaust gas stream generated in the kiln of the cement manufacturing plant by bringing the exhaust gas stream into contact with a circulating liquid absorbent stream such that contaminants are absorbed in said liquid absorbent, said gas cleaning system comprising:
- a scrubber configured to receive a contaminant rich exhaust gas stream and contact the gas stream with a stream of a liquid absorbent to form a stream of contaminant rich liquid absorbent;
- a regenerator configured to receive a stream of contaminant rich liquid absorbent from the scrubber, and heat the contaminant rich liquid absorbent to separate contaminants from the liquid absorbent to form a stream of contaminant lean liquid absorbent, and to return said stream of contaminant lean liquid absorbent to the scrubber;
- characterized in that the gas cleaning system comprises a heat exchanger configured to receive a hot exhaust gas stream from the kiln of the cement manufacturing plant to effect, at least partially, the heating of the contaminant rich liquid absorbent.
A cement manufacturing plant comprising a gas cleaning system for removing carbon dioxide (CO2) from an exhaust gas stream generated in the kiln of the cement manufacturing plant by bringing the exhaust gas stream into contact with a circulating liquid absorbent stream such that CO2 is absorbed in said liquid absorbent, said gas cleaning system comprising:
- a CO2 scrubber configured to receive a CO2 rich exhaust gas stream and contact the gas stream with a stream of a liquid absorbent to form a stream of CO2 rich liquid absorbent;
- a regenerator configured to receive a stream of CO2 rich liquid absorbent from the CO2 scrubber, and heat the CO2 rich liquid absorbent to separate CO2 from the liquid absorbent to form a stream of CO2 lean liquid absorbent, and to return said stream of CO2 lean liquid absorbent to the CO2 scrubber;
- characterized in that the gas cleaning system comprises a heat exchanger configured to receive a hot exhaust gas stream from the kiln of the cement manufacturing plant to effect, at least partially, the heating of the CO2 rich liquid absorbent.
A cement manufacturing plant comprising a gas cleaning system for removing ammonia (NH3) from an exhaust gas stream generated in the kiln of the cement manufacturing plant by bringing the exhaust gas stream into contact with a circulating liquid absorbent stream such that NH3 is absorbed in said liquid absorbent, said gas cleaning system comprising:
- a NH3 scrubber configured to receive an NH3 rich exhaust gas stream and contact the gas stream with a stream of a liquid absorbent to form a stream of NH3 rich liquid absorbent;
- a regenerator configured to receive a stream of NH3 rich liquid absorbent from the NH3 scrubber, and heat the NH3 rich liquid absorbent to separate NH3 from the liquid absorbent to form a stream of NH3 lean liquid absorbent, and to return said stream of NH3 lean liquid absorbent to the NH3 scrubber;
- characterized in that the gas cleaning system comprises a heat exchanger configured to receive a hot exhaust gas stream from the kiln of the cement manufacturing plant to effect, at least partially, the heating of the NH3 rich liquid absorbent.
Dependencies are inferred from the claim text.