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1. An ORC power generation system with a regenerator for utilization of LNG cold energy and industrial waste heat, comprising an LNG regasification circuit, an ORC circuit, and an industrial waste heat circuit; wherein, the ORC circuit utilizes the LNG cold energy released by the LNG regasification circuit via a three-fluid heat exchanger and the regenerator, and the ORC circuit utilizes the industrial waste heat of the industrial waste heat circuit via an evaporator; the ORC circuit comprises an expander, an electric generator, a gas-liquid separator, the regenerator, the three-fluid heat exchanger, a working medium circulation pump, a liquid reservoir and the evaporator, which are connected successively in that order and form a closed cycle; a temperature sensor and a pressure sensor are both installed at an inlet and an outlet of the expander; an exhaust steam of the expander enters the regenerator for precooling and then enters the three-fluid heat exchanger for primary condensation; a working medium that has been primarily condensed is pressurized by the working medium circulation pump and then enters the liquid reservoir; the working medium in turn enters the three-fluid heat exchanger, the regenerator and the evaporator and becomes high-temperature and high-pressure steam, which pushes the expander to drive the generator and thus converting mechanical energy into electricity; a bypass pipe parallel to the expander is set up in the ORC circuit for controlling the mass flow rate of the working medium.
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