Organic rankine binary cycle power generation system

Abstract

An organic rankine binary cycle power generation system includes: a superheater heating a working fluid by exchanging heat with discharged heat; a turbine receiving the working fluid from the superheater and generating mechanical energy; a power generator connected to a power shaft of the turbine and generating power; a condenser keeping gas-state and liquid-state working fluids having passed through the turbine; a pump pumping the liquid-state working fluid in the condenser; a buffer tank disposed in a working fluid line between the pump and the superheater and keeping the gas-state and liquid-state working fluids; a compressor connected to the power shaft of the turbine, connected to the condenser and the buffer tank through diverging lines, respectively; and an expansion valve disposed in a bypass line connecting the buffer tank and the condenser and forcibly evaporating the working fluid moved by a pressure difference between the buffer tank and the condenser.

1 . An organic rankine binary cycle power generation system comprising:
 a superheater heating a working fluid by exchanging heat with discharged heat;   a turbine receiving the working fluid from the superheater and generating mechanical energy;   a power generator connected to a power shaft of the turbine and generating power;   a condenser keeping gas-state and liquid-state working fluids having passed through the turbine;   a pump pumping the liquid-state working fluid in the condenser;   a buffer tank disposed in a working fluid line between the pump and the superheater and keeping the gas-state and liquid-state working fluids;   a compressor connected to the power shaft of the turbine, connected to the condenser and the buffer tank through diverging lines, respectively, and taking the working fluid inside from the condenser, compressing and heating the working fluid, and sending the working fluid to the buffer tank by using power from the turbine; and   an expansion valve disposed in a bypass line connecting the buffer tank and the condenser and forcibly evaporating the working fluid moved by a pressure difference between the buffer tank and the condenser,   wherein the working fluid is a single working fluid shared by a first cycle line made by a series of the turbine, the condenser, the pump, the buffer tank, and the superheater and a second cycle line made by a series of the compressor, the buffer tank, the expansion valve, and the condenser.   
     
     
         2 . The system of  claim 1 , wherein the turbine is any one of a screw turbine, a displacement turbine, and a turbo turbine. 
     
     
         3 . The system of  claim 1 , wherein the power generator and the compressor are connected to the power shaft of the turbine and operated together. 
     
     
         4 . The system of  claim 1 , wherein a cooling line for cooling the gas-state working fluid through heat exchange is further connected to the condenser. 
     
     
         5 . The system of  claim 1 , wherein the condenser and the buffer tank each have a plurality of separators having a plurality of holes and vertically spaced from each other, and
 the plurality of separators distribute the temperature of the gas-state and liquid-state working fluids in a plurality of layers by delaying convection of the kept working fluid.