Heating system and method for quick start of air separation unit

The invention discloses a heating system and method for quick start of an air separation device, and belongs to the technical field of air separation. An inlet of the supercharger is connected with a first heating gas inlet pipeline; the expansion air flow channel is provided with an expansion flow channel gas outlet after penetrating through the main heat exchanger, and the high-pressure air flow channel is provided with a high-pressure flow channel gas outlet after penetrating through the main heat exchanger; the oxygen flow channel is connected with a second heating gas inlet pipeline at an oxygen outlet of the rectifying tower; the oxygen flow channel is provided with an oxygen flow channel gas outlet after penetrating through the main heat exchanger; and the first heating gas inlet pipeline and the second heating gas inlet pipeline are connected with a heating gas source. The heating gas inlet pipeline is additionally arranged at the inlet of the supercharger and the inlet of the liquid oxygen pump, the