Boosting turbo expander

Abstract

The invention provides a boosting turbo expander comprising an intermediate shell. A turbine spiral case is arranged at the left end of the intermediate shell, a booster spiral case is arranged at the right end of the intermediate shell, the intermediate shell is internally and rotatably provided with a rotor, and two ends of the rotor are respectively provided with an expansion wheel and a boosting wheel in the turbine spiral case and the booster spiral case; and a left gas bearing and a right gas bearing are sleeved on the rotor, the left gas bearing is used for supporting the expansion wheel, and the right gas bearing is used for supporting the boosting wheel, wherein the left gas bearing and the right gas bearing are graphite gas bearings. The invention has the beneficial effects of stability, low noise, large supercharging ratio, improved rotation speed of the expander, and more environment protection; the refrigerating effect of the boosting turbo expander is improved about 2-3% compared with the refrigerating effect of an original machine; and the boosting turbo expander is not easy to break.

Description

technical field [0001] The invention relates to a booster turbo expander, in particular to a gas bearing turbo expander. Background technique [0002] The supercharged turbo expander is a key part necessary for air separation equipment, natural gas and petroleum gas liquefaction separation equipment and low temperature crushing equipment to obtain cooling capacity, and is the heart to ensure the stable operation of the entire set of air separation equipment. The main principle is to use the gas with a certain pressure to perform adiabatic expansion in the turbo expander to do external work and consume the internal energy of the gas itself, so that the gas itself is strongly cooled to achieve the purpose of refrigeration. The energy output from the turboexpander is recovered by the coaxial compressor or consumed by the braking fan. [0003] The gas bearing is one of the key components of the air separation plant (air separation plant) supporting single unit - the turbo expan...

AI Technical Summary

Problems solved by technology

The radial clearance of each gas bearing is 0.03-0.04 mm, and the axial clearance is 0.05-0.08 mm. During use, due to the high-speed rotation of the gas at the bearing, the temperature is high, and it is easy to cause shape deformation due to different materials. , so that the gap changes and the bearing capacity decreases

According to user feedback, more than 80% of the gas bearings are damaged by the thrust surface, that is, the brass end surface of the bearing rubs against the thrust surface of the rotor. Since the main shaft used by the rotor is made of 3Cr13, after friction, it will generally cause The bearing cannot be used and must be replaced, and the main shaft must generally be repaired. If it is serious, the main shaft must be replaced, which may affect the normal operation of the entire air separation plant and cause greater losses

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