| 摘要 |
The present invention relates to a natural gas constant-pressure facility comprising a carbon dioxide liquefaction system using cold energy in natural gas waste-pressure power generation. The purpose of the present invention is to perform the constant pressure control and waste-pressure power generation of natural gas, and use cold energy naturally generated during a waste-pressure power generation process for carbon dioxide liquefaction or the like without balancing the cold energy via a heating process. Accordingly, liquefaction costs of carbon dioxide are reduced, and heating costs of natural gas are reduced due to an increase in the temperature of natural gas. According to the present invention, the natural gas constant-pressure facility comprising a carbon dioxide liquefaction system using cold energy in natural gas waste-pressure power generation comprises: a constant pressure part (20) receiving natural gas whose temperature was increased by a first heater of a natural gas supply part to perform constant pressure control; a turbo-generation part (30) which is connected to the natural gas supply part in parallel with the constant pressure part, receives the natural gas whose temperature was increased by the first heater, and generates electricity using the waste pressure of the natural gas; a cold energy recovery part (40) recovering heat from the natural gas whose temperature was lowered via the turbo-generation part (30), and supplying the heat for carbon dioxide liquefaction; and a second heater (33) increasing the temperature of the natural gas whose temperature was lowered via the cold energy recovery part (40) to the temperature of the natural gas required to supply the natural gas to a place of usage. |
