This project we use nitrogen booster cycle in the design process of oxygen compression fast variable load process. The process in small air separation unit before the air leaves the molecular sieve is the same as the conventional process, and the air after leaving the molecular sieve purification unit is cooled in the main heat exchanger and then enters the pressure tower. The flow of the nitrogen booster cycle is as follows: pure nitrogen gas drawn from the top of the pressure tower is reheated in the main heat exchanger, compressed by a nitrogen cycle compressor and cooled in the compressor cooler before entering the main heat exchanger for cooling. The compressed nitrogen is cooled in the main heat exchanger and then divided into two streams. One strand is cooled by the inner compressed liquid oxygen and sent to the top of the pressure tower by throttling, and the other strand is pumped out from the middle section, expanded by the high pressure expander and then enters the gas-liquid separator, where the gas nitrogen is merged with the nitrogen from the pressure tower and returned to the main heat exchanger together, and the liquid nitrogen enters the liquid nitrogen kettle at the top of the low pressure tower. The pure nitrogen from the top of the low pressure tower is reheated in the main heat exchanger of the subcooler and then divided into two streams, one into the make-up gas compressor, compressed into the nitrogen cycle compressor, and the other into the water cooling tower.
Dear Air's small air separation unit and large air separation unit and liquid in small air separation plant are designed to meet our customers' nitrogen requirements.
