| 摘要 |
PROBLEM TO BE SOLVED: To produce a liquefied nitrogen efficiently by utilizing the temperature of LNG effectively by cooling a combustion exhaust gas by utilizing the temperature of a discharged LNG, producing a dry ice by the solidification of carbon dioxide gas contained in the combustion exhaust gas and separating it, and compressing and cooling a residual exhaust gas further. SOLUTION: LNG 11 coming out from LNG storage 1 is heat exchanged with a compression gas 13 by a heat exchanger 2 and NG 12 is made by the heat exchange with a combustion exhaust gas 10 by a fluidized bed type heat exchanger 3. While, the combustion exhaust gas 10 is cooled to about -40 to -70 deg.C by the heat exchange with NG gas 12 and the minute particle shape powder body of a dry ice is generated in the fluidized bed and this is separated from the residual exhaust gas by a cyclone 21 and stored in a dry ice storage 20. Then, the residual exhaust gas is supplied to a gas compressor 4 through a filter 22 to form a compression gas 13 and cooled by the heat exchange to LNG 11 by the heat exchanger 2 and further, after being heat exchanged to the low temperature gas 17 and cooled by the low temperature air heat exchanger 9, its one part is made to a liquefied nitrogen 14 by a adiabatic expansion device 5 and stored in a storage 6. |
