Completely sealed circulating power generation system and power generation method for low-grade heat energy

Abstract

The invention discloses a completely sealed circulating power generation system for low-grade heat energy. The completely sealed circulating power generation system is characterized in that an evaporating plant, an expander, a condensing plant and a circulating pump are sequentially connected to form a working medium circulating power generation main loop, intermediate media are injected into the working medium circulating power generation main loop, the system further comprises a current-limiting device, a storage tank, a separating device and a reinjection device which are sequentially connected, the current-limiting device is mounted at a power output end of the expander, an output end of the reinjection device is connected with the working medium circulating power generation main loop through a pipeline to form a leaked working medium reinjection loop, and a power generator is connected with the power output end of the expander through a gear case. The invention further discloses a completely sealed circulating power generation method for the low-grade heat energy. As the intermediate media are circulated in the completely sealed loop, the low-grade heat energy is converted into electric energy, and the problems of increase of operating cost, reduction of reliability, environmental pollution and the like due to leakage of the intermediate media can be avoided.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and relates to resource utilization of low-grade thermal energy such as industrial low-temperature waste heat, solar energy, geothermal energy, and ocean temperature difference, and in particular to a completely closed cycle power generation system and a power generation method for low-grade thermal energy. Background technique [0002] Low-grade thermal energy includes industrial low-temperature waste heat, solar energy, geothermal energy, ocean temperature difference energy, etc. Due to the huge amount of low-grade thermal energy resources, even converting a small part of them into electric energy has very important practical significance for solving my country's energy problems and reducing environmental pollution. Taking the industrial field as an example, usually about 30% of the energy consumption in the production process is finally converted into various forms of low-tem...

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Problems solved by technology

[0004] The present invention aims to solve the above-mentioned problems in the prior art, and provides a completely closed-cycle power generation system for low-grade thermal energy and its power generation method, which avoids the increase in operating costs, the reduction in reliability and the environmental impact caused by the leakage of the intermediate medium. pollution and other issues

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