Carbon dioxide capturing apparatus using cold heat of liquefied natural gas and power generation system using same

A power generation system using cold heat of liquefied natural gas (LNG), the system comprising:

• an LNG storage facility for storing the LNG;
• a power generation facility for generating power using fuel and discharging flue gas;
• a heat exchange unit in which heat exchange occurs between the LNG supplied from the LNG storage facility and a coolant so that the LNG is regasified into natural gas and the coolant is cooled, the heat exchange unit comprising a heat exchanger in which the coolant is cooled to a first temperature through heat exchange between the coolant and the LNG, and a chiller that discharges a capturing coolant generated through heat exchange between a portion of the coolant discharged from the heat exchanger and the LNG;
• and
• a capturing unit for capturing carbon dioxide contained in the flue gas by causing heat exchange between the discharged flue gas and the coolant, the capturing unit comprising a capturing cooler for separating carbon dioxide contained in the flue gas through heat exchange between the capturing coolant discharged from the chiller and the flue gas, and a gas cooler that preliminarily cools the flue gas using the coolant discharged from the capturing cooler before the flue gas flows into the capturing cooler.