Two-stage cantilever type axial-flow expander

Abstract

The invention discloses a two-stage cantilever type axial-flow expander. The two-stage cantilever type axial-flow expander comprises a primary expander, a secondary expander and a motor, wherein the primary expander comprises a gas inlet housing, a primary spray nozzle ring and a primary rotor impeller; the secondary expander comprises a unit housing, a secondary spray nozzle ring and a secondaryrotor impeller; the motor comprises a motor rotor and a stator winding; the gas inlet housing and the unit housing are oppositely arranged to form a cavity; the motor rotor is arranged in the cavity along the axis of the cavity; an auxiliary pushing bearing shell, a motor housing and a secondary guide housing are sequentially arranged on the outer edge of the motor rotor in a direction from the gas inlet housing to the unit housing; the end surface, close to the gas inlet housing, of the motor rotor is coaxially equipped with a primary input end; and the end surface, close to the unit housing,of the motor rotor is coaxially equipped with a secondary input end. The two-stage cantilever type axial-flow expander disclosed by the invention can effectively reduce rotation speed of the expanders through two-stage axial flow, improves reliability and efficiency of the motor and a frequency converter, and obtains a relatively high energy conversion rate.

Description

technical field [0001] The invention relates to the technical field of expanders in waste pressure and waste heat power generation systems, in particular to a two-stage cantilever type axial flow expander. Background technique [0002] At present, the pressure regulation of my country's natural gas transmission and distribution pipeline network adopts valve pressure relief, and the pressure energy is not utilized, resulting in a large amount of energy waste. my country's annual natural gas consumption is about 200 billion cubic meters, of which more than 130 billion cubic meters are self-produced and more than 60 billion cubic meters are imported. There are different degrees of pressure regulation links from the gas production port to the user. Using an expander instead of a pressure regulating valve to reduce pressure can recover the wasted pressure energy and convert it into mechanical energy for power generation. [0003] Natural gas is a flammable and explosive gas, onc...

AI Technical Summary

Problems solved by technology

[0009] 1. Sealing problem;

[0010] 2. Lubricating oil pollutes the working gas;

[0011] 3. The speed of the unit is high and the reliability is poor;

[0012] 4. The axial thrust of the expander is very large, and the axial thrust that the unit can bear is very limited;

[0013] 5. Short service life, frequent repair and maintenance;

[0014] 6. The system is complicated and the cost is high

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