Closed loop supercritical carbon dioxide power cycle

Abstract

One embodiment of a closed loop supercritical carbon dioxide power generation process is provided. This process includes Indirectly exchanging heat between a hot gas stream and a warm supercritical carbon dioxide stream, expanding the heated supercritical carbon dioxide stream in a turbine, indirectly exchanging heat from the expanded supercritical carbon dioxide stream in a high temperature recuperator, thereby a cooled, expanded supercritical carbon dioxide steam, splitting the cooled, expanded supercritical carbon dioxide stream into a first stream and a second stream, compressing the first stream in a main compressor, and introducing the compressed first stream into the low temperature recuperator, and compressing the second stream in a recompressor, combining the compressed second stream with the heated first stream, and introducing the combined stream into the high temperature recuperator, wherein it indirectly exchanges heat with expanded supercritical carbon dioxide stream, thereby producing the warm supercritical carbon dioxide stream.

What is claimed is: 
     
         1 . A closed loop supercritical carbon dioxide power generation process, comprising:
 indirectly exchanging heat between a hot gas stream ( 101 ) and a warm supercritical carbon dioxide stream ( 104 ),   expanding the heated supercritical carbon dioxide stream ( 105 ) in a turbine ( 106 )   indirectly exchanging heat ( 108 ,  110 ) from the expanded supercritical carbon dioxide stream ( 107 ) in a high temperature recuperator ( 108 ) and the a temperature recuperator ( 110 ), thereby producing a cooled, expanded supercritical carbon dioxide steam ( 111 ),   splitting the cooled, expanded supercritical carbon dioxide stream ( 111 ) into a first stream ( 112 ) and a second stream ( 113 ),   compressing the first stream ( 112 ) in a main compressor ( 116 ), and introducing the compressed first stream into the low temperature recuperator ( 110 ), and   compressing the second stream ( 113 ) in a recompressor ( 118 ), combining the compressed second stream with the heated first stream, and introducing the combined stream into the high temperature recuperator ( 108 ), wherein it indirectly exchanges heat with expanded supercritical carbon dioxide stream ( 107 ), thereby producing the warm supercritical carbon dioxide stream ( 104 )   
     
     
         2 . The closed loop supercritical carbon dioxide power generation process of  claim 1 , wherein the first stream ( 112 ) comprises between 50% and 70% of cooled, expanded supercritical carbon dioxide stream ( 111 ). 
     
     
         3 . The closed loop supercritical carbon dioxide power generation process of  claim 2 , wherein the first stream ( 112 ) comprises between 55% and 65% of cooled, expanded supercritical carbon dioxide stream ( 111 ). 
     
     
         4 . The closed loop supercritical carbon dioxide power generation process of  claim 3 , wherein the first stream ( 112 ) comprises 60% of cooled, expanded supercritical carbon dioxide stream ( 111 ). 
     
     
         5 . The closed loop supercritical carbon dioxide power generation process of  claim 1 , wherein the temperature of hot gas stream ( 101 ) is between 650 C and 750 C. 
     
     
         6 . The closed loop supercritical carbon dioxide power generation process of  claim 5 , wherein the temperature of hot gas stream ( 101 ) is between 675 C and 725 C. 
     
     
         7 . The closed loop supercritical carbon dioxide power generation process of  claim 6 , wherein the temperature of hot gas stream ( 101 ) is 700 C.