High-purity oxygen production device taking air as raw material

The utility model discloses a high-purity oxygen production device taking air as a raw material. The high-purity oxygen production device comprises a cold box, a booster expander, a main heat exchanger, a nitrogen tower, an oxygen tower condensation evaporator, a nitrogen tower condensation evaporator and a high-purity oxygen tower, the air expander is connected with the air reboiler through a pipeline via the cooler and the main heat exchanger; the air reboiler is connected with the main heat exchanger through a pipeline; a natural gas raw material with pressure is connected with the LNG reboiler at the bottom of the rectifying tower through a pipeline via the main heat exchanger; the top of the rectifying tower is connected with the bottom of the condensation evaporator; and the top of the condensation evaporator is connected with a gas-liquid separator through a pipeline via a crude helium subcooler. According to the high-purity oxygen production device, air can be used as a raw material, production of hig