| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for preparing dry ice where high concentration gaseous CO<SB>2</SB>recovered utilizing factory exhaust heat is used for a refrigerant of a CO<SB>2</SB>liquefying cycle, further, by a supercooled supercritical CO<SB>2</SB>cooled by cold utilizing exhaust heat, the increase of function and the increase of efficiency are made possible, and to provide an apparatus therefor. <P>SOLUTION: Utilizing high concentration gaseous CO<SB>2</SB>recovered utilizing factory exhaust heat as a refrigerant, supercooled supercritical CO<SB>2</SB>is formed by a compressor 12, and gaseous CO<SB>2</SB>coolers 26, 27, 28, the supercooled supercritical CO<SB>2</SB>is separated into liquefied CO<SB>2</SB>and gaseous CO<SB>2</SB>by a first gas-liquid separation pressure reduction means 31, the gaseous CO<SB>2</SB>is made to flow back to the compressor 12, so as to form a CO<SB>2</SB>liquefying cycle, from the liquefied CO<SB>2</SB>, the gaseous CO<SB>2</SB>is separated together with the production of dry ice by a second gas-liquid separation pressure reduction means 33, and the gaseous CO<SB>2</SB>is made to flow back to the CO<SB>2</SB>liquefying cycle. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
