Organic Rankine cycle power generation system with liquid ejection device

Abstract

The invention discloses an organic Rankine cycle power generation system with a liquid ejection device. The organic Rankine's cycle power generation system is mainly characterized in that: a liquid ejector and a working medium pump are additionally arranged between an expander and a condenser in a Rankine cycle system; the working fluid inlet of the liquid ejector is connected with a secondary working medium pump; the inlet of a fluid ejected by the liquid ejector is connected with the outlet of the expander; the mixed fluid outlet of the liquid ejector is connected with the inlet on the working medium side of the condenser; the working medium side outlet is connected with the primary working medium pump and the secondary working medium pump respectively; and the primary working medium pump is connected in series with an evaporator, the expander, the inlet of fluid ejected by the liquid ejector and the condenser sequentially to form a closed loop. The exhausted gas of the expander is used as the ejected fluid, the back pressure of the expander can be reduced, the working pressure difference is increased, and the working capacity of the Rankine cycle system can be improved. Meanwhile, the non-steam liquid ejection is adopted, and heat input of the ejector is prevented, so that the output work of the Rankine cycle system is increased, and the thermal efficiency is obviously improved under the condition of inputting the same amount of heat.

Description

technical field [0001] The invention belongs to thermal power generation technology, in particular to a Rankine cycle power generation device which adopts an ejector to improve the output work of an expander. Background technique [0002] Although the Organic Rankine Cycle (ORC) using organic working fluid instead of water vapor can expand the range of utilization of medium and low temperature heat sources, due to the small difference between the temperature of medium and low temperature heat sources and the ambient temperature, the working pressure difference in the expansion process is small , so the work ability is low, and the energy conversion efficiency is low, which limits the popularization and application of medium and low temperature heat source ORC power generation. At present, the improvement strategies for this technology at home and abroad are: screening of working fluid; optimization of system components (such as optimal design of expander), using transcritica...

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Problems solved by technology

[0002] Although the Organic Rankine Cycle (ORC) using organic working fluid instead of water vapor can expand the utilization range of medium and low temperature heat sources, because the difference between the temperature of medium and low temperature heat sources and the ambient temperature is small, the working pressure difference in the expansion process is small , so the work ability is low and the energy conversion efficiency is low, which limits the popularization and application of medium and low temperature heat source ORC power generation

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