Gas treatment process and system
First Claim
1. A process for cleaning a gas stream containing carbon dioxide and sulfur dioxide, including removal of carbon dioxide from the gas stream in a carbon dioxide removal stage;
- the process comprisinga) removing, in a sulfur removal stage, sulfur dioxide from the gas stream by bringing the gas stream into direct contact with a liquid comprising ammonia, to absorb into the liquid sulfur dioxide from the gas stream such that the gas stream is depleted in sulfur dioxide;
b) cooling, in a gas cooling stage, the gas stream such that a cooled gas stream is formed;
c) removing, in the carbon dioxide removal stage, carbon dioxide from the cooled gas stream depleted in sulfur dioxide by bringing the gas stream into contact with ammoniated liquid to absorb into the liquid carbon dioxide from the gas stream such that the gas stream is depleted in carbon dioxide and enriched in ammonia;
d) removing, in an ammonia removal stage, ammonia from the gas stream depleted in carbon dioxide by bringing the gas stream into direct contact with an acidic liquid, to absorb into the acidic liquid ammonia from the gas stream such that the gas stream is depleted in ammonia; and
e) heating, in a gas heating stage, the gas stream depleted in ammonia such that a heated gas stream is formed;
wherein at least a portion of the used liquid from stage a) is withdrawn and directed for reuse in stage a), and at least a portion of the used liquid from stage d) is withdrawn and directed for reuse in stage d).
2 Assignments
0 Petitions
Accused Products
Abstract
A gas stream containing carbon dioxide and sulfur dioxide is cleaned by removing, in a sulfur removal stage, sulfur dioxide from the gas stream. Sulfur dioxide is removed from the gas stream by bringing the gas stream into direct contact with ammonia. The used ammonia may be recycled.
In a carbon dioxide removal stage, carbon dioxide is removed from the gas stream depleted in sulfur dioxide by bringing the gas stream into contact with an ammoniated liquid. Following sulfur dioxide and carbon dioxide removal, in an ammonia removal stage, ammonia from the gas stream is removed. Ammonia is removed from the gas stream by bringing the gas stream into direct contact with an acidic liquid to absorb into the acidic liquid, ammonia from the gas stream. The used acidic liquid may be recycled.
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Citations
21 Claims
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1. A process for cleaning a gas stream containing carbon dioxide and sulfur dioxide, including removal of carbon dioxide from the gas stream in a carbon dioxide removal stage;
- the process comprising
a) removing, in a sulfur removal stage, sulfur dioxide from the gas stream by bringing the gas stream into direct contact with a liquid comprising ammonia, to absorb into the liquid sulfur dioxide from the gas stream such that the gas stream is depleted in sulfur dioxide; b) cooling, in a gas cooling stage, the gas stream such that a cooled gas stream is formed; c) removing, in the carbon dioxide removal stage, carbon dioxide from the cooled gas stream depleted in sulfur dioxide by bringing the gas stream into contact with ammoniated liquid to absorb into the liquid carbon dioxide from the gas stream such that the gas stream is depleted in carbon dioxide and enriched in ammonia; d) removing, in an ammonia removal stage, ammonia from the gas stream depleted in carbon dioxide by bringing the gas stream into direct contact with an acidic liquid, to absorb into the acidic liquid ammonia from the gas stream such that the gas stream is depleted in ammonia; and e) heating, in a gas heating stage, the gas stream depleted in ammonia such that a heated gas stream is formed; wherein at least a portion of the used liquid from stage a) is withdrawn and directed for reuse in stage a), and at least a portion of the used liquid from stage d) is withdrawn and directed for reuse in stage d). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- the process comprising
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13. A gas cleaning system for cleaning a gas stream containing carbon dioxide and sulfur dioxide, including a carbon dioxide removal arrangement, the system comprising
a sulfur removal device arranged upstream of the carbon dioxide removal arrangement, with respect to the flow direction of the gas stream, configured to receive and to bring the gas stream into contact with a liquid comprising ammonia, to form and to discharge a gas stream depleted in sulfur dioxide; -
a gas cooling arrangement arranged upstream of the carbon dioxide removal arrangement, with respect to the flow direction of the gas stream, configured to receive and to cool the gas stream, and to discharge a cooled gas stream; a carbon dioxide removal arrangement comprising at least one carbon dioxide absorber configured to receive the cooled gas stream depleted in sulfur dioxide and to bring the gas stream into contact with ammoniated liquid, to form and to discharge a gas stream depleted in carbon dioxide and enriched in ammonia; an ammonia removal device arranged downstream of the carbon dioxide removal arrangement, with respect to the flow direction of the gas stream, configured to receive the gas stream from the carbon dioxide removal arrangement and to bring the gas stream into contact with an acidic liquid to form and to discharge a gas stream depleted in ammonia; and a gas heating arrangement arranged downstream of the carbon dioxide removal arrangement, with respect to the flow direction of the gas stream, configured to receive the gas stream depleted in ammonia, to heat the gas stream and to discharge a heated gas stream; wherein the sulfur removal device is configured to receive and reuse at least a portion of the used liquid discharged from the sulfur removal device, and the ammonia removal device is configured to receive and reuse at least a portion of the used liquid discharged from the ammonia removal device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification