Boiler using liquid metal as working medium and power generation system comprising same

A boiler, which circulates working media to perform a heat exchange with a heat medium, comprising:

• two or more combustion furnaces, to which the working media heated up to different temperatures are supplied;
• two or more heat exchange parts, which are connected to a corresponding number of combustion furnaces and to which the working media heated at different temperatures in each combustion furnace are supplied;
• a heat medium injection part, in which one side thereof supplies the heat medium to the heat exchange part with the lowest temperature among the heat exchange parts;
• and
• a supply part, which is connected to the other side of the heat medium injection part and supplies the heat medium thereto,
• wherein the heat exchange of the heat medium supplied from an end of the heat medium injection part and the working media is performed in two or more heat exchange parts by direct contact,
• wherein the heat medium gradually reaches high-temperature and high-pressure states at a threshold point or higher by means of the heat exchange, and the working medium is a liquid metal,
• wherein the liquid metal is in the liquid state during contact with the heat medium, and
• wherein the boiling point of the liquid metal is at least 1560 degrees Celsius at atmospheric pressure.