Organic Rankine cycle heat engine device based on multiple expansion machines

Abstract

The invention discloses an organic Rankine cycle heat engine device based on multiple expansion machines. The organic Rankine cycle heat engine device based on the multiple expansion machines comprises an expansion mechanism and a circulation circuit. The expansion mechanism comprises the N expansion machines and three-way valves which are connected with the N expansion machines, wherein N is a natural number larger than 1, and an expansion machine series connection operation mode or an expansion machine parallel connection operation mode or a single expansion operation mode is adopted by the expansion mechanism according to an expansion ratio. According to the organic Rankine cycle heat engine device based on the mutiple expansion machines, the number of expansion machines is increased or decreased according to operation conditions, the expansion machine series connection operation mode or the expansion machine parallel connection operation mode or the single expansion operation mode is achieved through control of the three-way valves, requirements of the device for flow are met, the operation problem of the heat engine device caused by the fact that types of the expansion machines can not meet the requirements of work conditions can be effectively solved, energy conservation and emission reduction can be achieved, and operation efficiency of the device is improved.

Description

technical field [0001] The invention relates to an organic Rankine cycle heat engine device using multiple expanders. The device is based on the organic Rankine cycle, including forms with and without reheat expansion, and adopts widely existing low-energy sources such as solar energy, geothermal energy, and industrial waste heat. Grade thermal energy is used as a heat source to generate electricity. Background technique [0002] With the increasing consumption of fossil energy such as coal, oil, and natural gas, as well as the environmental burden (such as carbon dioxide emissions, etc.) brought about by energy consumption, energy and environmental issues have become a major concern of the world. Against this background, the conversion of low-grade heat into electricity using an organic Rankine cycle has attracted increasing attention. The so-called organic Rankine cycle means that in the traditional Rankine cycle, organic working fluid (such as R113, R123, etc.) is used i...

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Problems solved by technology

In terms of increasing the temperature of the heat source, it is often faced with the problem that the temperature is not high enough, resulting in low cycle efficiency

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