Stripper overhead heat integration system for reduction of energy consumption

Abstract

A stripper heat integration system includes a first heat exchanger; a second heat exchanger; and a refrigerant loop comprising a refrigerant and configured for flow of the refrigerant therein. The refrigerant loop is in communication with the first heat exchanger and the second heat exchanger. The stripper heat integration system further includes a compressor located in the refrigeration loop, and configured to compress the refrigerant prior to the refrigerant entering the second heat exchanger. The first heat exchanger and the second heat exchanger are in fluid communication with a stripper, and the stripper heat integration system is configured for use with a carbon capture system, to reduce energy consumption of the carbon capture system.

What is claimed is: 
     
         1 . A stripper heat integration system comprising:
 a first heat exchanger;   a second heat exchanger;   a refrigerant loop comprising a refrigerant and configured for flow of the refrigerant therein, the refrigerant loop in communication with the first heat exchanger and the second heat exchanger; and   a compressor located in the refrigeration loop, configured to compress the refrigerant prior to the refrigerant entering the second heat exchanger;   wherein the first heat exchanger and the second heat exchanger are in fluid communication with a stripper, and the stripper heat integration system is configured for use with a carbon capture system, to reduce energy consumption of the carbon capture system.   
     
     
         2 . The stripper heat integration system of  claim 1 , wherein the first heat exchanger is a condenser and the second heat exchanger is a reboiler. 
     
     
         3 . The stripper heat integration system of  claim 1 , wherein the refrigerant is selected from the group consisting of water, ammonia, hydrocarbons, and a combination thereof. 
     
     
         4 . The stripper heat integration system of  claim 2 , wherein the condenser is configured to receive the refrigerant and reduce temperature. 
     
     
         5 . The stripper heat integration system of  claim 4 , wherein the compressor is configured to receive the reduced temperature refrigerant, compress the refrigerant, and increase pressure of the refrigerant, wherein the refrigerant thereafter condenses in the reboiler. 
     
     
         6 . The stripper heat integration system of  claim 2 , wherein operating temperature of the reboiler is greater than operating temperature of the condenser. 
     
     
         7 . The stripper heat integration system of  claim 1 , further comprising a recirculating slip stream exiting and entering the stripper. 
     
     
         8 . The stripper heat integration system of  claim 1 , wherein the system is part of a chilled ammonia process (CAP) system. 
     
     
         9 . The stripper heat integration system of  claim 7 , wherein the system comprises a third heat exchanger. 
     
     
         10 . A method of recovering heat duty from a stripper comprising:
 contacting in a first heat exchanger a gas stream comprising water, ammonia and CO 2  with a liquid refrigerant of a refrigerant loop, wherein the gas stream is sent to the first heat exchanger from a stripper overhead section of the stripper, and the refrigerant loop comprises the refrigerant and is in communication with the first heat exchanger and a second heat exchanger; and   after the contacting, obtaining from the first heat exchanger a condensed stream comprising, water, ammonia and CO 2  and at a temperature less than the temperature of the gas stream entering the first heat exchanger;   wherein the first heat exchanger and the second heat exchanger are in fluid communication with the stripper.   
     
     
         11 . The method of  claim 10 , wherein the gas stream entering the first heat exchanger is at a temperature between about 60° C. and about 190° C., and the condensed stream exiting the first heat exchanger is at a temperature between about 40° C. and about 130° C. 
     
     
         12 . The method of  claim 10 , wherein the first heat exchanger is a condenser and the second heat exchanger is a reboiler. 
     
     
         13 . The method of  claim 10 , wherein the refrigerant is selected from the group consisting of water, ammonia, hydrocarbons, and a combination thereof. 
     
     
         14 . The method of  claim 12 , wherein the condenser receives the liquid refrigerant and vaporizers the liquid refrigerant to form a vaporized refrigerant. 
     
     
         15 . The method of  claim 14 , comprising compressing the vaporized refrigerant with use of a compressor to increase pressure and compress the vaporized refrigerant. 
     
     
         16 . The method of  claim 11 , comprising recirculating a slip stream into and out of the stripper. 
     
     
         17 . The method of  claim 11 , comprising recovering the stripper heat duty in a chilled ammonia process (CAP).