Multilevel centripetal turbine system

Abstract

The invention discloses a multilevel centripetal turbine system and relates to the turbine technology. The system comprises a turbine expansion system, a reheating system and a driving system, the number of centripetal turbines of the system is even, the number of levels ranges from 2 to 8 and is determined by the expansion ratio, and each level of centripetal turbine comprises one or multiple centripetal turbines. Each two of the centripetal turbines are matched through rotating speed, has the same rotating speed and are arranged in a coaxial back-to-back form to offset axial force of a rotor. The inlet temperature of the multilevel centripetal turbine ranges from 220K to 973K, and the inlet pressure ranges from 3bar to 340bar. Heat sources of the reheating system are low-and-medium temperature (heat value) heat sources and especially are industrial residual heat and waste heat. Shaft work generated by each level of the centripetal turbines, after passing through a gearbox, is output by a main shaft to a motor or to beused as power sources for industrial production. The multilevel centripetal turbine system has the advantages of high efficiency and expansion ratio, simple and compact structure, high operating reliability, recoverability of low-and-medium temperature (heat value) waste heat and the like.

Description

technical field [0001] The invention relates to the technical field of turbines, and relates to a multi-stage centripetal turbine system with reheating. Background technique [0002] The centripetal turbine has the advantages of simple and compact structure, simple manufacturing process, low cost, convenient installation, high efficiency (current single-stage centripetal turbine isentropic efficiency can reach more than 90%), single-stage expansion ratio Flat can replace two or more axial flow turbines) and other characteristics. Widely used in expansion turbines of small and medium gas turbines, turbochargers, refrigeration devices and liquefaction devices. [0003] At present, according to the published information, most of the centrifugal turbines are single-stage, and the maximum single-stage expansion ratio is 15. Due to the particularity of the structure of the centripetal turbine, it is very difficult to realize the multistage centripetal turbine, and the multistage...

AI Technical Summary

Problems solved by technology

Especially when the gas is under high pressure, the volume flow rate of the working medium is small, and the efficiency of other forms of turbo expanders is not high, while the centripetal turbine can still maintain high efficiency under the small volume flow rate, but the single-stage The expansion ratio of centrifugal turbine is limited, so there is an urgent need for an efficient and reliable multi-stage centrifugal turbine system

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