The invention relates to an
air separation device for large liquid amount preparation and a method. The
air separation device comprises an
air filter, an
air compressor, a purification unit, a
supercharger, a high-low-temperature supercharged
turbine expander and a cryogenic separation cold box unit.
Compressed air directly undergoes heat exchange and then enters a lower
tower partially, and undergoes supercharging by the
supercharger and then is cooled and throttled to enter the lower
tower partially, air pumping is carried out in the
supercharger, the air undergoes double-supercharging double-expansion of the high-low-temperature supercharged
turbine expander and then enters the lower
tower, the product
oxygen and the product
nitrogen adopt a double-pump internal compression process, andan
argon-making
system adopts an
oxygen-enriched
liquid air total-
reflux form. According to the disclosed method of the
air separation device for large liquid amount preparation by cryogenic separation, the step of air pumping in the supercharger and the step of enabling the air to undergo double-supercharging double-expansion of the high-low-temperature supercharged
turbine expander and then toenter the lower tower are adopted, the product
oxygen and the product
nitrogen adopt the double-pump internal compression process, and the
argon-making
system adopts the total-
reflux form, so that therequirement of large liquid amount air separation large
cooling capacity is well met, the circulation of the
material flow is fully utilized, the equipment is reduced, the
energy consumption is reduced, and the extraction rate is improved.