Technical parameters of air separation equipment

What is the function of the condenser evaporator in the fractionation tower of the air separation equipment?

LNG Cold Energy Utilisation Air Separation Plant is a liquid air separation plant for the utilization of LNG cold energy with a high utilization rate of cold energy, energy saving and environmental protection, high efficiency and safety factor. Liquid air separation plant for LNG cold energy, including air compression pre-cooling system, purification system, air separation system, nitrogen circulation system. The nitrogen circulation system consists of a high pressure heat exchanger to recover ...