Gas bearing low-temperature booster expansion turbine

Abstract

The invention discloses a gas bearing low-temperature supercharging turbo expander which comprises a middle shell, the two ends of the middle shell are connected with an expansion end and a supercharging end respectively, a rotor is rotatably arranged in the middle shell, and an expansion wheel and a supercharging wheel are arranged at the two ends of the rotor respectively. The expansion wheel and the pressurization wheel are located in the turbine volute and the supercharger volute respectively, the rotor is sleeved with gas bearings, the gas bearings comprise the first gas bearing and the second gas bearing, the first gas bearing is used for supporting the expansion wheel, the second gas bearing is used for supporting the pressurization wheel, and the expansion end and the pressurization end are both arranged in the cold box. According to the low-temperature supercharging turbo expander for the gas bearing, the expansion end and the supercharging end of the expander are both arranged in the cold box, normal-temperature supercharging is changed into low-temperature supercharging, atmospheric heat is effectively prevented from being conducted into the expander, and meanwhile, the partition plate is arranged in the cold box, so that it is guaranteed that the expander is convenient to assemble and disassemble, high in efficiency and reliable and stable in operation.

Description

technical field [0001] The invention belongs to the field of supercharging turboexpanders, in particular to a gas bearing low temperature supercharging turboexpander. Background technique [0002] Turboexpander is the key equipment necessary for obtaining cold energy such as air separation equipment, natural gas (LPG) liquefaction separation equipment and low-temperature crushing equipment, and is the heart of ensuring the stable operation of the entire set of equipment. As the core equipment of air separation products, turboexpander basically provides all the cooling capacity of air separation equipment, and its performance directly determines the technical level of the whole set of products. The main principle is to use the gas with a certain pressure to perform adiabatic expansion in the turboexpander 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. If you use a gas c...

AI Technical Summary

Problems solved by technology

[0004]Currently, the normal temperature supercharged turboexpander is conventionally used, only a cold box is installed at the expansion end, and the supercharging end is at normal temperature, which cannot completely avoid heat conduction to the expander Among them, if the low-temperature supercharged turboexpander is used instead, the original normal temperature supercharging ratio can be increased by about half, and the pressure difference before and after supercharging can generally increase by more than 0.2MPa, which improves the low-temperature value of the cooling capacity and is more conducive to low-temperature precision. The most important thing is to increase the extraction rate of the product, reduce the unit energy consumption, improve the economical efficiency of the device, achieve the purpose of energy saving and emission reduction, and improve the technical level of the domestic expander and air separation

In addition, when the expander is running, the contact friction between the impeller and the sealing cover will occasionally occur. At this time, the impeller and the sealing cover must be disassembled for repair. In the prior art, there is still an improvement requirement to meet the maintenance convenience

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