The principle of supporting expander of air separation plant is: adiabatic expansion of gas and external work is an important method to obtain low temperature. Turbine expander uses compressed gas to enter expander under high pressure and expand to low pressure. From high-pressure and low-speed gas to low-pressure and high-speed gas, there is no heat exchange with the outside world in this process, so the positive process is adiabatic. After the gas passes through the expander, the energy will be reduced, and the reduced energy will be delivered in the form of work, thus reducing the internal energy and temperature of the working medium at the outlet of the expander. Most of the cooling capacity of air separation equipment is taken by expansion mechanism. With the progress of science and technology, the supporting expander of air separation plant for industrial application is put forward higher requirements, which requires higher efficiency, better stability, more safe and reliable system.
