Vortex permanent magnet expander and waste heat recovery power generation system using the expander

Abstract

The invention belongs to the technical field of afterheat utilization, and in particular, relates to a vortex permanent magnet expander. The vortex permanent magnet expander comprises a movable vortex disc, a static vortex disc, an eccentric shaft and a generator arranged in a shell; the center of the static vortex disc is communicated with an intake port; high-pressure gas injected from the intake port can outwards expand along a spiral path from the center of the static vortex disc to push rotation of the movable vortex disc; the movable vortex disc drives a main shaft of the generator to rotate through the eccentric shaft; and the shell is provided with an organic working medium liquid spraying port opposite to the generator. The organic working medium liquid spraying port is added on a machine body of a traditional vortex expander; the organic working medium flash evaporation is formed by huge pressure difference between two ends of the liquid spraying port; the generator temperature in the expander is lowered; the production heat caused by iron loss, copper loss and the like in the generator is shifted away; and the working temperature of the generator is kept in a reasonable range, so that the expansion process of an organic working medium achieves a similar effect to isentropic expansion process, and the effective guarantee for improving the performances of the expander is provided.

Description

technical field [0001] The invention belongs to the technical field of waste heat utilization, and in particular relates to a vortex permanent magnet expander and a waste heat recovery power generation system using the expander. Background technique [0002] The use of Organic Rankine Cycle (ORC) for power generation can efficiently and environmentally friendly convert low-grade energy into high-grade electrical energy, and the research on expansion components is the key to ORC research. The scroll expander is a compact and cheap expansion mechanism, and many researchers choose it as the expansion part of the small ORC system due to its potential superior performance. [0003] At present, the development of fully enclosed scroll permanent magnet expanders has the problem of poor power generation efficiency and thermal efficiency. More loss and heat will cause the generator's operating temperature to rise and exceed the normal operating temperature range, and long-term opera...

AI Technical Summary

Problems solved by technology

[0003] At present, the development of fully enclosed scroll permanent magnet expanders has the problem of poor power generation efficiency and thermal efficiency. More loss and heat will cause the operating temperature of the generator to rise and exceed the normal operating temperature range. Long-term operation will also accelerate the demagnetization phenomenon

At the same time, this part of loss and heat will also enter the ORC system with the exhaust gas of the expander, which increases the superheat of the exhaust gas and the load of the condenser, thus affecting the thermal efficiency of the system

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