Low-grade thermally-driven Rankine power generation device with ejector

Abstract

The invention discloses a low-grade thermally-driven Rankine power generation device with an ejector, which comprises a generator, an expansion machine, a power generator, an ejector, an absorber, a circulating pump and a solution heat exchanger. The circulating pump transports the working fluid required to complete an absorption process in the absorber to the generator through the low-temperature side of the solution heat exchanger; an absorbent solution on the high-temperature side of the solution heat exchanger is cooled and then fed into the ejector; the working fluid in the generator is heated by an input heating source so as to generate high-pressure working steam; the high-pressure working steam is fed into the expansion machine for doing work through expanding; the working steam subjected to expansion is fed into the ejector, and is injected by the working fluid in the ejector; and finally, the working steam is fed into the absorber to complete the absorption process. According to the invention, the expansion machine can do more mechanical work in the process of expansion, so that the heat conversion efficiency is higher; and the mechanical work consumed in the process of transporting the solution subjected to absorption to the generator by the circulating pump is obviously reduced, therefore, the net power generation efficiency of the whole device is greatly improved.

Description

technical field [0001] The invention relates to a low-grade heat-driven power generation device, in particular to a low-grade heat-driven Rankine power generation device with an injector. Background technique [0002] In the process of industrial production, it is often accompanied by a large amount of waste heat and waste heat discharge. Low-grade heat with a temperature below 230°C exists widely and in large quantities, such as gas turbines, metallurgical industries, cement industries, petrochemical industries, and food processing industries. A large amount of low-grade waste heat is discharged . For these waste heat, the traditional technology is difficult to use and the economy is extremely poor. Therefore, it is often discharged directly to the environment, which leads to low energy utilization and thermal pollution to the environment. [0003] Converting low-grade heat into electricity is a promising application. At present, some researchers have studied the applicat...

AI Technical Summary

Problems solved by technology

This is of great significance for overcoming the shortcomings of low-grade thermal power generation efficiency and poor economy in the current Rankine plant

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