Method for extracting carbon dioxide from flue gas

A method for extracting carbon dioxide from a flue gas, comprising:

• a preparing process implemented by collecting the flue gas generated by oxygen-enriched combustion of a glass raw material with methane from a glass furnace, wherein the flue gas includes the carbon dioxide, nitrogen, water vapor, oxygen, fluoric acid compounds, and boric acid compounds;
• an acid removing process implemented by performing a first acid removing operation on the flue gas, wherein the first acid removing operation is implemented by using a sodium hydroxide aqueous solution to remove the fluoric acid compounds and the boric acid compounds in the flue gas, wherein, in the acid removing process, a second acid removing operation is further performed on the flue gas, and the second acid removing operation is implemented by using sodium bicarbonate powders to remove the fluoric acid compounds and the boric acid compounds in the flue gas;
• and
• a purifying and liquefying process implemented by using a purifying and liquefying unit to extract the flue gas that already undergoes the acid removing process, so as to obtain liquid carbon dioxide having a purity greater than 99%.