Carbon dioxide purification system

A carbon dioxide purification system for the treatment of a waste gas produced by a generator, comprising:

• a water removal unit which includes at least one drying device for reducing water vapor in the waste gas from the generator, the waste gas passing through the at least one drying device, so as to form a dry gas mixture having carbon dioxide gas, water vapor with a volume concentration of less than 1 ppm, carbon monoxide gas, and organic pollutants potentially harmful to a subject;
• and
• a purification unit which is disposed downstream of the water removal unit and communicates with the water removal unit, and includes a plurality of pressure swing adsorption devices disposed and connected in series with each other, the pressure swing adsorption devices being used to purify carbon dioxide gas from the dry gas mixture, so as to obtain a gas product containing carbon dioxide gas with a purity of more than 99.5%,
• wherein each pressure swing adsorption device is filled with a first adsorbent and a second adsorbent, the first adsorbent having an activated carbon molecular sieve and a first plating layer plated on the surface of the activated carbon molecular sieve, and the second adsorbent having an aluminosilicate molecular sieve and a second plating layer plated on the surface of the aluminosilicate molecular sieve, a volume ratio of the first adsorbent to the second adsorbent in decimal form being 1, each of the first plating layer and the second plating layer being selected from the group consisting of a titanium dioxide plating layer, a nano-gold plating layer, and a nano-silver plating layer.