Screw expansion generating device

Abstract

The invention discloses a screw expansion generating device which can be used for organic Rankine cycle. The screw expansion generating device comprises a semi-closed or full-closed shell; the shell comprises an expansion machine cavity and a generator cavity; the expansion machine cavity and the generator cavity are not communicated; the expansion machine cavity is internally provided with a screw expansion machine, and the generator cavity is internally provided with a generator; a rotor of the screw expansion machine is fixedly connected with a rotor of the generator; the generating device drives the generator to generate electricity by rotation of the rotor of the screw expansion machine; the generator cavity is provided with a liquid refrigeration working medium injection port and a refrigeration working medium outlet; and the generator is cooled by evaporation of the liquid refrigeration working medium. The screw expansion generating device is semi-closed or full-closed, the screw expansion machine and the generator are integrally arranged in the shell, the generator can be a synchronous generator and can also be an asynchronous generator, and the condition of refrigeration working medium leakage when the screw expansion generator generates electricity can be avoided.

Description

technical field [0001] The invention belongs to the technical field of power generation equipment, relates to an organic Rankine cycle power generation system, and also relates to a semi-sealed or fully sealed screw expansion power generation device. Background technique [0002] see figure 1 , figure 1 It is a typical Organic Rankin Cycle (ORC), including an expander 1', a generator 2', an evaporator 3', a liquid pump 4', and a condenser 5'. [0003] The liquid refrigerant of low temperature and low pressure is boosted in the liquid pump 4'; then it enters the evaporator 3' to be heated and vaporized until it becomes superheated gas (high temperature and high pressure), and then enters the expander 1' to expand and do work, and drives the generator 2' generate electricity. The low-temperature and low-pressure gas after work enters the condenser 5' to be cooled and condensed into liquid; and then returns to the liquid pump 4' to complete a cycle. [0004] Existing expand...

AI Technical Summary

Problems solved by technology

[0005] At the same time, in a cascade ORC cycle (or other applications), the end-of-expansion temperature may be so high that it becomes impractical to cool the generator with the expanded exhaust

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