The cryogenic method of separating air equipment has a number of parts, each part of the realisation of the way and the use of different equipment, composed of different processes.
According to the type of expander is divided into piston type, turbine type and pressurised turbine type. The piston type has a small expansion capacity and low efficiency, and is only used in a part of the old type of small devices. Turbine type is the most widely used due to its high efficiency. For low-pressure air separation device, due to the expansion of air into the upper tower to participate in the distillation, hoping to meet the requirements of the cooling capacity of the expansion as small as possible, in order to improve the distillation separation effect. Booster turbine is to use the output power of the expander to drive the booster to compress the expansion air from the air compressor, further increase the pressure and then for the expander to expand, in order to increase the unit refrigeration capacity and reduce the expansion volume. This is more and more widely used in the new low-pressure air separation process.
According to the expansion gas is divided into air expansion process and nitrogen expansion process. Expansion of air into the upper tower will affect the distillation; nitrogen expansion to reduce the condensation of nitrogen in the main cooling, i.e., into the upper tower of the reflux liquid is reduced, the same distillation of the upper tower has an impact, both have their advantages and disadvantages.
DEAR Air Separation has long-term experience in industry production, design, technology and equipment manufacturing, according to customer needs to design a suitable technical process.
