The expander is the main source of cooling capacity to supplement the cooling capacity loss of the cold box, so its regulation is of great significance to the operation of the air separation unit. There are many ways to regulate it. The simple one is the inlet throttling regulation. The inlet pipe of the expander is equipped with a regulating valve to adjust the inlet pressure through the change of opening, and the enthalpy drop and isentropic efficiency of the expander are changed at the same time, so as to achieve the purpose of regulating the cooling capacity.
The R&D team of DEAR Air Separation uses MUSE: plate-fin heat exchanger calculation software, TASC: shell-and-tube heat exchanger calculation software, NREC: compressor simulation software, SW6: pressure vessel calculation software, LANSYS: pressure vessel calculation software, SULPAK: structured packing tower hydrodynamics calculation, PACKCOL: bulk packing tower hydrodynamics calculation, KOSOCV: control valve selection calculation. At the same time, we independently developed: sieve tray tower structure design, distillation calculation of tower equipment, hydrodynamics calculation of packed tower, factory keeper and factory management system, etc.
