초록 ▼

A waste heat recovery system includes a closed fluid circuit through which an organic motive fluid flows, and a heat exchanger for transferring heat from waste heat gases to the motive fluid. A first flashing unit flashes the motive fluid which exits the heat exchanger into a high pressure flashed v

A waste heat recovery system includes a closed fluid circuit through which an organic motive fluid flows, and a heat exchanger for transferring heat from waste heat gases to the motive fluid. A first flashing unit flashes the motive fluid which exits the heat exchanger into a high pressure flashed vapor portion. Another flashing unit flashes liquid non-flashed motive fluid, producing a low pressure flashed vapor portion. A high pressure turbine module receives the high pressure flashed vapor portion to produce power, and a low pressure turbine module receives a combined flow of motive fluid vapor comprising the low pressure flashed vapor portion and discharge vapor from the high pressure turbine module whereby additional power is produced.

대표청구항 ▼

1. A waste heat recovery system, comprising: a closed fluid circuit through which an organic motive fluid flows,a heat exchanger connected to receive waste heat combustion gases and communicating with said closed fluid circuit for transferring heat from the waste heat combustion gases to an organic

1. A waste heat recovery system, comprising: a closed fluid circuit through which an organic motive fluid flows,a heat exchanger connected to receive waste heat combustion gases and communicating with said closed fluid circuit for transferring heat from the waste heat combustion gases to an organic motive fluid liquid flowing in said heat exchanger in the closed fluid circuit,first organic motive fluid flashing means connected to said closed fluid circuit at a position of the closed fluid circuit for flashing the organic motive fluid liquid which exits said heat exchanger into a high pressure flashed organic motive fluid vapor portion,second organic motive fluid flashing means connected to said closed fluid circuit at a position of the closed fluid circuit for flashing liquid remaining non-flashed organic motive fluid, producing a low pressure flashed organic motive fluid vapor portion,a high pressure organic vapor turbine module connected to said closed fluid circuit at a position of the closed fluid circuit to receive said high pressure flashed organic motive fluid vapor portion directly from the first organic motive fluid flashing means to produce power,a low pressure organic vapor turbine module connected to said closed fluid circuit at a position of the closed fluid circuit to directly receive a combined flow of organic motive fluid vapor comprising said low pressure flashed organic motive fluid vapor portion from the second organic motive fluid flashing means and discharge organic motive fluid vapor from said high pressure organic vapor turbine module, whereby additional power is produced,an organic motive fluid recuperator for receiving high pressure organic vapor discharged from said high pressure organic vapor turbine module,a further organic motive fluid recuperator for receiving low pressure organic vapor discharged from said low pressure organic vapor turbine module,an organic vapor condenser for condensing discharge organic vapor from the low pressure organic vapor turbine module, the organic vapor condenser producing organic motive fluid condensate for supply to said heat exchanger, anda cycle pump for delivering a portion of the organic motive fluid condensate to said organic motive fluid recuperator and for delivering a further portion of the organic motive fluid condensate to said further organic motive fluid recuperator. 2. The system according to claim 1, wherein the first organic motive fluid flashing means comprises a high pressure organic motive fluid flash chamber for receiving the organic motive fluid exiting the heat exchanger and producing the high pressure organic vapor flashed portion supplied to said high pressure organic vapor turbine module, and the second organic motive fluid flashing means comprises a low pressure organic motive fluid flash chamber for receiving a non-flashed organic motive fluid discharge from said high pressure organic motive fluid flash chamber and producing the low pressure organic motive fluid flashed portion supplied to said low pressure organic vapor turbine module. 3. The system according to claim 2, wherein said organic motive fluid recuperator comprises a direct contact organic motive fluid recuperator, and wherein said cycle pump delivers the portion of the organic motive fluid condensate from said organic vapor condenser to said direct contact organic motive fluid recuperator for mixing with the high pressure organic vapor turbine module discharge vapor,whereby a mixed flow produced exiting said direct contact organic motive fluid recuperator is combined with the low pressure organic vapor flashed portion to produce the combined flow supplied to the low pressure organic vapor turbine module. 4. The system according to claim 3, wherein said further organic motive fluid recuperator is provided for heating said further portion of the organic motive fluid condensate from said organic vapor condenser using the low pressure turbine module organic vapor discharge. 5. The system according to claim 4, further comprising an organic motive fluid preheater for preheating the organic motive fluid recuperated condensate by means of a non-flashed organic motive fluid discharge from the low pressure organic motive fluid flash chamber. 6. The system according to claim 5, wherein heat depleted low pressure organic motive fluid flash chamber discharge is combined with the organic motive fluid condensate from the organic motive fluid recuperator. 7. The system according to claim 6, further comprising an organic motive fluid condensate pump for supplying the organic motive fluid condensate to the heat exchanger so as to ensure that the organic motive fluid condensate will remain in a liquid phase. 8. The system according to claim 3, further comprising a first control valve in communication with a fluid line extending from the high pressure organic motive fluid flash chamber to the high pressure organic vapor turbine module, anda second control valve in communication with a fluid line extending from the low pressure organic motive fluid flash chamber and the low pressure organic vapor turbine module. 9. The system according to claim 8 further comprising a third control valve in communication with a fluid line extending from the cycle pump to the direct contact organic motive fluid recuperator. 10. The system according to claim 8, further comprising a first safety valve in communication with a fluid line extending between the heat exchanger and the high pressure organic motive fluid flash chamber, anda second safety valve in communication with a fluid line upstream to the heat exchanger. 11. The system according to claim 10, further comprising a controller for controlling operation of the cycle pump,a first control valve, a second control valve, a first safety valve and a second safety valve in accordance with sensed operating conditions. 12. The system according to claim 9, further comprising a controller for controlling operation of the third control valve. 13. The system according to claim 7, further comprising a controller for controlling operation of the condensate pump, and condensate pump in accordance with sensed operating conditions. 14. The system according to claim 4, wherein the high pressure and low pressure organic vapor turbine modules are separate turbine modules coupled to a common generator. 15. The system according to claim 4, wherein the high pressure and low pressure organic vapor turbine modules are first and second stages, respectively, of a common organic vapor turbine coupled to a generator. 16. A waste heat recovery system, comprising: a closed fluid circuit through which an organic motive fluid flows,a heat exchanger connected to receive waste heat combustion gases and communicating with said closed fluid circuit for transferring heat from the waste heat combustion gases to an organic motive fluid liquid flowing in said heat exchanger in said closed fluid circuit,first organic motive fluid flashing means connected to said closed fluid circuit at a position of the closed fluid circuit for flashing the organic motive fluid liquid which exits said heat exchanger into a high pressure flashed organic motive fluid vapor portion,second organic motive fluid flashing means connected to said closed fluid circuit at a position of the closed fluid circuit for flashing liquid remaining non-flashed organic motive fluid, producing a low pressure flashed organic motive fluid vapor portion,an organic vapor turbine for producing power having a high pressure stage connected to said closed fluid circuit at a position of the closed fluid circuit to receive said high pressure flashed organic motive fluid vapor portion directly from the first organic motive fluid flashing means,a low pressure stage connected to said closed fluid circuit at a position of the closed fluid circuit to directly receive a combined flow of organic motive fluid vapor comprising said low pressure flashed organic motive fluid vapor portion from the second organic motive fluid flashing means and discharge organic motive fluid vapor from said high pressure stage whereby additional power is produced by said turbine,an organic motive fluid recuperator for receiving high pressure organic vapor discharged from said high pressure organic vapor turbine module,a further organic motive fluid recuperator for receiving low pressure organic vapor discharged from said low pressure organic vapor turbine module, andan organic vapor condenser for condensing discharge organic vapor from the low pressure organic vapor turbine module, the organic vapor condenser producing organic motive fluid condensate for supply to said heat exchanger, anda cycle pump for delivering a portion of the organic motive fluid condensate to said organic motive fluid recuperator and for delivering a further portion of the organic motive fluid condensate to said further organic motive fluid recuperator. 17. The system according to claim 1, wherein the heat exchanger communicates with a source of waste heat combustion gases at about 500° C. 18. The system according to claim 16, wherein the heat exchanger communicates with a source of waste heat combustion gases at about 500° C.