The invention relates to an ORC (Organic Rankine Cycle) for the conversion of thermal energy into electric energy, comprising at least one heat exchanger unit for re-superheating the working fluid by means of the thermovector fluid from the hot source, between the discharge of the first expander and
The invention relates to an ORC (Organic Rankine Cycle) for the conversion of thermal energy into electric energy, comprising at least one heat exchanger unit for re-superheating the working fluid by means of the thermovector fluid from the hot source, between the discharge of the first expander and the input of the second expander, and a regenerator unit including a first regenerator and at least one second regenerator for regenerating the working fluid in at least two successive stages, in said first regenerator and at least in said second regenerator respectively, with an additional regenerative heat exchange along the flow line connecting the liquid working fluid output of the second regenerator to the liquid working fluid input of the first regenerator.
대표청구항▼
1. An ORC system (Organic Rankine Cycle) for the conversion of thermal energy into electric energy, comprising: a thermovector fluid,a thermal heating source for heating the thermovector fluid,a primary circuit in which flows a thermovector fluid coming from said thermal source,a working fluid,a rel
1. An ORC system (Organic Rankine Cycle) for the conversion of thermal energy into electric energy, comprising: a thermovector fluid,a thermal heating source for heating the thermovector fluid,a primary circuit in which flows a thermovector fluid coming from said thermal source,a working fluid,a related second fluid circuit wherein the working fluid circulates in the related second fluid circuit,at least one relative pump wherein the working fluid circulates by means of the relative pump,a heat exchange group for the exchange of heat between the thermovector fluid and the working fluid,a first expander having an input and an output, wherein the working fluid from said heat exchange group is fed to the first expander through the input,a first electric generator connected to the first expander,a second expander having an inlet and an outlet, wherein the working fluid from the output of the first expander is fed to the second expander through the inlet,a second electric generator connected to the second expander,a conduit of the working fluid in a gaseous form connected to the outlet of said second expander,a regenerator group disposed along the conduit of the working fluid connected to the outlet of said second expander, anda condenser connected to and located downstream of said regenerator group,wherein at least one heat exchanger unit of the heat exchanger group re-superheats the working fluid with the thermovector fluid coming from the thermal source, wherein the heat exchanger unit is located between the output of the first expander and the inlet of the second expander, andthe regenerator group comprises at least a first regenerator, a second regenerator, a flow line connecting the first and second regenerators, and a heat exchanger disposed between the regenerators and along the flow line, wherein the working fluid flows in the flow line, each of the regenerators regenerates the working fluid, and the heat exchanger exchanges heat between a fraction of gaseous working fluid drawn from at least one of the expanders and a liquid working fluid flowing from the second regenerator toward the first regenerator. 2. An ORC system according to claim 1, wherein said heat exchange unit for the re-superheating of the working fluid comprises an exchanger/superheater disposed upstream of said heat exchanger group and in the primary circuit of the thermovector fluid, and wherein the exchanger/superheater is connected to the output of the first expander and the inlet of the second expander. 3. An ORC system according to claim 1, wherein the first electric generator rotates at a first rotational speed and the second electric generator rotates at a second rotational speed, andthe first rotational speed is greater than the second rotational speed. 4. An ORC system according to claim 1, wherein means are provided for a control of the fraction of gaseous working fluid collected from at least one of said expanders and the liquid working fluid towards the heat exchanger positioned between the first regenerator and the second regenerator. 5. An ORC system according to claim 1, wherein the thermovector fluid is made up of a mixture containing biphenyl and biphenyl oxide and the working fluid is a cyclic hydrocarbon. 6. An ORC system according to claim 1, wherein the thermovector fluid is made up of a mixture containing biphenyl and biphenyl oxide and the working fluid is an aromatic hydrocarbon. 7. An ORC system according to claim 1, wherein the thermovector fluid is made up of a mixture containing biphenyl and biphenyl oxide and the working fluid is toluene. 8. An ORC system according to claim 1, further comprising a collecting conduit and a de-superheating exchanger, wherein the collecting conduit is provided for collecting a fraction of gaseous working fluid at least from the first expander, and the collecting conduit feeds the fraction to said heat exchanger via the de-superheating exchanger. 9. An ORC system according to claim 8, wherein the first expander further includes an intermediate part and said collecting conduit for collecting the fraction of gaseous working fluid is connected to the intermediate part or to the ouput of the first expander. 10. An ORC system according to claim 8, wherein the second expander further includes an intermediate part and said collecting conduit for collecting the fraction of gaseous working fluid is connected to the intermediate part of the second expander. 11. An ORC system according to claim 1, wherein one heat exchanger is provided for a first heating of the working fluid at the expense of the sensible heat of the exiting liquid working fluid in the heat exchanger positioned between the first regenerator and the second regenerator, a second heating of the same working fluid being carried out in the de-superheating exchanger of the gaseous working fluid deriving from one of the expanders. 12. An ORC system according to claim 11, further comprising a container provided with level control means and a throttle valve, wherein the level control means control the throttle valve, and wherein the heat exchanger positioned between the first regenerator and the second regenerator and the heat exchanger for the first heating of the working fluid at the expense of the sensible heat of the liquid working fluid are connected to the container. 13. A method for a conversion of thermal energy into electric energy using an ORC system according to claim 1, comprising: re-superheating the working fluid between the output of the first expander and the inlet of the second expander, through an exchange of heat with the thermovector fluid coming from the thermal heating source, andexchanging heat between the fraction of gaseous working fluid collected from at least one of said expanders and the liquid working fluid flowing from the second regenerator toward the first regenerator. 14. A method according to claim 13, further comprising de-superheating the fraction of gaseous working fluid collected from at least one of said expanders prior to the exchanging heat between said fraction of gaseous working fluid and the liquid working fluid flowing from the second regenerator toward the first regenerator.
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