A feedwater heater (10) for a steam generator communicating feedwater through an external heat exchanger (12), a deaerator (14) that allows the use of carbon steel feedwater tubes, a first heater (16), an evaporator section (18) and steam drum (17) for communicating a portion of the feedwater in the
A feedwater heater (10) for a steam generator communicating feedwater through an external heat exchanger (12), a deaerator (14) that allows the use of carbon steel feedwater tubes, a first heater (16), an evaporator section (18) and steam drum (17) for communicating a portion of the feedwater in the form of steam to the deaerator (14), and a second heater (20).
대표청구항▼
1. A feedwater heater system for a heat recovery steam generator (HRSG) which said HRSG has a casing having an inlet and an outlet and an internal gas exhaust flow path there between, comprising: a water-to-water heat exchanger positioned to be external to the internal gas exhaust flow path of the H
1. A feedwater heater system for a heat recovery steam generator (HRSG) which said HRSG has a casing having an inlet and an outlet and an internal gas exhaust flow path there between, comprising: a water-to-water heat exchanger positioned to be external to the internal gas exhaust flow path of the HRSG, the external water-to-water heat exchanger having a first inlet for receiving feedwater, a second inlet, a first outlet and a second outlet;a deaerator located to be external to the internal gas exhaust flow path of the HRSG, the deaerator having at least one outlet and having a first inlet, and a second inlet;a first conduit path configured for flow connection there through, extending from flow connection with the first outlet of the external water-to-water heat exchanger to flow connection with the first inlet of the deaerator;a second conduit path configured for flow connection there through, extending from the at least one deaerator outlet to flow connection with the second inlet of the external water-to-water heat exchanger;a first feedwater heater located within the internal gas exhaust flow path of the HRSG at a position upstream of the outlet of the HRSG, the first heater having an outlet and having an inlet;a feedwater evaporator comprising coils of heat exchanger tubes which are located within the internal gas exhaust flow path of the HRSG at a position upstream of the first feedwater heater, the feedwater evaporator coils having an outlet;a third conduit path configured for flow connection there through, extending from flow connection with the feedwater evaporator coils outlet to flow connection with the second deaerator inlet for communicating steam to the deaerator;a fourth conduit path configured for flow connection there through, extending from flow connection with the second outlet of the external water-to-water heat exchanger to flow connection with the inlet of the first heater;a second feedwater heater located within the internal gas exhaust flow path of the HRSG at a position upstream of the feedwater evaporator, the second heater having an outlet and having an inlet; anda fifth conduit path configured for flow connection there through, extending from flow connection with the outlet of the first heater to flow connection with the second heater inlet. 2. The feedwater heater system of claim 1, further comprising: a second, low pressure, evaporator positioned within the internal gas exhaust flow path to be upstream of the second feedwater heater and downstream of the inlet of the HRSG, the second low pressure evaporator having an inlet; and a sixth conduit configured for flow connection there through, extending in flow connection with the outlet of the second feedwater heater to flow connection with the inlet of the second, low pressure, evaporator. 3. The feedwater heater system of claim 2, wherein the configuration of the flow paths among the external water-to-water heat exchanger, the first and second feedwater heaters, the feedwater evaporator and the deaerator allow the temperature of the feedwater discharged from the second feedwater heater to be capable of being about the same as the operating temperature of the second, low pressure, evaporator. 4. The feedwater heater system of claim 1, further comprising, the first feedwater heater and the second feedwater heater having tubes of carbon steel. 5. The feedwater heater system of claim 1, the feedwater evaporator further comprising a steam drum located external to the internal gas exhaust flow path of the HRSG, the steam drum being positioned to be in the flow path of the third conduit to be in flow connection with the outlet of the feedwater evaporator coils and flow connection with the second inlet of the deaerator. 6. The feedwater heater system of claim 1 wherein the feedwater evaporator has an inlet for receiving water. 7. The feedwater heater system of claim 1 further comprising wherein the configuration of the external water-to-water heat exchanger, the first and second feedwater heaters and the feedwater evaporator allows the temperature of the feedwater initially entering the first inlet of the external water-to-water heat exchanger to be capable of initially having a temperature below that of the dew point of sulfuric acid in the exhaust gas, and the feedwater from the second flow path of the external water-to-water heat exchanger to the first feedwater heater to be capable of entering the inlet of the first feedwater heater at a temperature at about 140° F. 8. A feedwater heater system for a heat recovery steam generator (HRSG) which said HRSG has a casing having an inlet and an outlet and an internal gas exhaust flow path there between, comprising: a water-to-water heat exchanger positioned to be external to the internal gas exhaust flow path of the HRSG, the external water-to-water heat exchanger having a first inlet for receiving feedwater, a second inlet, a first outlet and a second outlet;a deaerator located to be external to internal gas exhaust flow path of the HRSG, the deaerator having at least one outlet and having a first inlet, and a second inlet;a first conduit path configured for flow connection there through, extending from flow connection with the first outlet of the external water-to-water heat exchanger to flow connection with the first inlet of the deaerator;a second conduit path configured for flow connection there through, extending from the at least one deaerator outlet to flow connection with the second inlet of the external water-to-water heat exchanger;a first feedwater heater comprising coils of heat exchanger tubes which said heat exchanger tubes are located within the internal gas exhaust flow path of the HRSG at a position upstream of the outlet of the HRSG, the first heater having an outlet and having an inlet;a feedwater evaporator comprising coils of heat exchanger tubes which said heat exchanger tubes are located within the internal gas exhaust flow path of the HRSG at a position upstream of the first feedwater heater, the coils of the feedwater evaporator having an outlet, the feedwater evaporator also comprising a steam drum located external to the internal gas exhaust flow path of the HRSG, the steam drum having an inlet in flow connection with the outlet of the coils of the feedwater evaporator tubes, the steam drum having an outlet;a third conduit path configured for flow connection there through, extending from flow connection with the outlet of the coils of the feedwater evaporator tubes through the steam drum inlet and through the steam drum outlet to flow connection with the second deaerator inlet, for communicating steam to the deaerator;a fourth conduit path configured for flow connection there through, extending from flow connection with the second outlet of the external water-to-water heat exchanger to flow connection with the inlet of the first heater;a second feedwater heater comprising coils of heat exchanger tubes which said heat exchanger tubes are located within the internal gas exhaust flow path of the HRSG at a position upstream of the feedwater evaporator, the second heater having an outlet and having an inlet; anda fifth conduit path configured for flow connection there through, extending from flow connection with the outlet of the first feedwater heater to flow connection with the second feedwater heater inlet;a second, low pressure, evaporator comprising coils of heat exchanger tubes which said heat exchanger tubes are positioned within the internal gas exhaust flow path to be upstream of the second feedwater heater and downstream of the inlet of the HRSG, the second low pressure evaporator having an inlet; and a sixth conduit configured for flow connection there through, extending in flow connection with the outlet of the second feedwater heater to flow connection with the inlet of the second, low pressure, evaporator. 9. The feedwater heater system of claim 8, wherein the configuration of the flow paths among the external water-to-water heat exchanger, the first and second feedwater heaters, the feedwater evaporator and the deaerator allow the temperature of the feedwater discharged from the second feedwater heater to be capable of being about the same as the operating temperature of the second, low pressure, evaporator. 10. The feedwater heater system of claim 8, further comprising, the first feedwater heater and the second feedwater heater having tubes of carbon steel. 11. The feedwater heater system of claim 9 wherein the configuration of the external water-to-water heat exchanger, the first and second heaters and the feedwater evaporator allows the temperature of the feedwater to be capable of initially having a temperature below that of the dew point of sulfuric acid in the exhaust gas, and the feedwater from the second flow path of the external water-to-water heat exchanger to the first heater to be capable of entering the inlet of the first heater at a temperature at about 140° F. 12. A process for heating feedwater for a heat recovery steam generator (HRSG) which said HRSG has a casing having an inlet and an outlet and an internal gas exhaust flow path there between, comprising: a water-to-water heat exchanger positioned to be external to the internal gas exhaust flow path of the HRSG, the external water-to-water heat exchanger having a first flow path and a second flow path, a first inlet for receiving feedwater, a second inlet, a first outlet and a second outlet;a deaerator positioned to be external to the internal gas exhaust flow path of the HRSG, the deaerator having at least one outlet and having a first inlet, and a second inlet;a first feedwater heater located within the internal gas exhaust flow path of the HRSG at a position upstream of the outlet of the HRSG, the first feedwater heater having an outlet and having an inlet;a feedwater evaporator comprising coils of heat exchanger tubes which said heat exchanger tubes are located within the internal gas exhaust flow path of the HRSG at a position upstream of the first feedwater heater;a second feedwater heater located within the internal gas exhaust flow path of the HRSG at a position upstream of the feedwater evaporator coils of heat exchanger tubes;a first conduit path configured for flow connection there through, extending from flow connection with the first outlet of the external water-to-water heat exchanger to flow connection with the first inlet of the deaerator;a second conduit path configured for flow connection there through, extending from the at least one deaerator outlet to flow connection with the second inlet of the external water-to-water heat exchanger;another conduit path configured for flow connection there through, extending from flow connection with the second outlet of the external water-to-water heat exchanger to flow connection with the inlet of the first feedwater heater;directing the feedwater into the first flow path of the external water-to-water heat exchanger to elevate the temperature of the incoming feedwater;directing the feedwater from the first flow path of the external water-to-water heat exchanger through the first conduit and through the first deaerator inlet into the deaerator to remove gases from the feedwater;directing steam into the deaerator;directing the feedwater from the at least one deaerator outlet through the second conduit to the second inlet of the external water-to-water heat exchanger to the second flow path of the external water-to-water heat exchanger to elevate the temperature of the feedwater within the first flow path of the external water-to-water heat exchanger;directing the feedwater from the second flow path of the external water-to-water heat exchanger from the second outlet of the external water-to-water heat exchanger through the another conduit to the inlet of the first feedwater heater to elevate the temperature of the feedwater; anddirecting the feedwater from the first feedwater heater to the second feedwater heater to elevate the temperature of the feedwater. 13. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 12, further comprising the steps of: a second, low pressure, evaporator positioned within the internal gas exhaust flow path to be upstream of the second feedwater heater and downstream of the inlet of the HRSG; anddirecting the feedwater from the second feedwater heater to the second, low pressure, evaporator, and passing the feedwater through the second low pressure evaporator to elevate the temperature of the feedwater. 14. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 12, further comprising the feedwater evaporator also comprising a steam drum located external to the internal gas exhaust flow path of the HRSG, the steam drum having an inlet in flow connection with an outlet of the coils of the feedwater evaporator tubes; and directing steam from the steam drum to the deaerator. 15. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 12, wherein the temperature of the feedwater initially entering the first inlet of the external water-to-water heat exchanger initially has a temperature below that of the dew point of sulfuric acid in the exhaust gas, and the feedwater from the second flow path of the external water-to-water heat exchanger to the first feedwater heater enters the inlet of the first feedwater heater at a temperature at about 140 ° F. 16. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 13 wherein the temperature of the feedwater discharged from the second feedwater heater is about the same as the operating temperature of the second, low pressure, evaporator. 17. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 15 further comprising the first feedwater heater and the second feedwater heater having tubes of carbon steel. 18. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 12 further providing the feedwater evaporator with an inlet that is in fluid flow connection with the outlet of the first feedwater heater, and providing a flow path extending from the first feedwater heater to the feedwater evaporator, and directing the feedwater from the first feedwater heater to the feedwater evaporator inlet. 19. A process for heating feedwater for a heat recovery steam generator (HRSG) which said HRSG has a casing having an inlet and an outlet and an internal gas exhaust flow path there between, comprising: a water-to-water heat exchanger positioned to be external to the internal gas exhaust flow path of the HRSG, the external water-to-water heat exchanger having a first flow path and a second flow path, a first inlet for receiving feedwater, a second inlet, a first outlet and a second outlet;a deaerator positioned to be external to the internal gas exhaust flow path of the HRSG, the deaerator having at least one outlet and having a first inlet, and a second inlet;a first feedwater heater located within the internal gas exhaust flow path of the HRSG at a position upstream of the outlet of the HRSG, the first feedwater heater having an inlet and an outlet;a feedwater evaporator comprising coils of heat exchanger tubes which said heat exchanger tubes are located within the internal gas exhaust flow path of the HRSG at a position upstream of the first feedwater heater, the feedwater evaporator tubes having an outlet, the feedwater evaporator also comprising a steam drum located external to the internal gas exhaust flow path of the HRSG, the steam drum having an inlet in flow connection with the outlet of the coils of the feedwater evaporator tubes, the steam drum having an outlet;a second feedwater heater located within the internal gas exhaust flow path of the HRSG at a position upstream of the feedwater evaporator coils of heat exchanger tubes;a first conduit path configured for flow connection there through, extending from flow connection with the first outlet of the external water-to-water heat exchanger to flow connection with the first inlet of the deaerator;a second conduit path configured for flow connection there through, extending from the at least one deaerator outlet to flow connection with the second inlet of the external water-to-water heat exchanger;another conduit path configured for flow connection there through, extending from flow connection with the second outlet of the external water-to-water heat exchanger to flow connection with the inlet of the first feedwater heater;directing the feedwater into the first flow path of the external water-to-water heat exchanger to elevate the temperature of the incoming feedwater;directing the feedwater from the first flow path of the external water-to-water heat exchanger through the first conduit and through the first deaerator inlet into the deaerator to remove gases from the feedwater;directing steam through the steam drum into the deaerator;directing the feedwater from the at least one deaerator outlet through the second conduit to the second inlet of the external water-to-water heat exchanger to the second flow path of the external water-to-water heat exchanger to elevate the temperature of the feedwater within the first flow path of the external water-to-water heat exchanger;directing the feedwater from the second flow path of the external water-to-water heat exchanger from the second outlet of the external water-to-water heat exchanger through the another conduit to the inlet of the first feedwater heater to elevate the temperature of the feedwater;directing the feedwater from the first feedwater heater to the second feedwater heater to elevate the temperature of the feedwater;a second, low pressure, evaporator positioned within the internal gas exhaust flow path to be upstream of the second feedwater heater and downstream of the inlet of the HRSG;directing the feedwater from the second feedwater heater to the second, low pressure, evaporator at a temperature that is about the same as the operating temperature of the second, low pressure, evaporator, and elevating the temperature of the feedwater in the second, low pressure, evaporator; andproviding the feedwater that initially has a temperature that is below that of the dew point of sulfuric acid in the exhaust gas, and wherein the feedwater directed from the second flow path of the external water-to-water heat exchanger to the first feedwater heater enters the inlet of the first feedwater heater at a temperature at about 140° F. 20. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 19 further comprising the first feedwater heater and the second feedwater heater having tubes of carbon steel. 21. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 19 further providing the feedwater evaporator with an inlet that is in fluid flow connection with the outlet of the first feedwater heater, and providing a flow path extending from the first feedwater heater to the feedwater evaporator, and directing the feedwater from the first feedwater heater to the feedwater evaporator inlet. 22. A feedwater heater system for a heat recovery steam generator (HRSG) which said HRSG has a casing having an inlet and an outlet and an internal gas exhaust flow path there between, comprising: a water-to-water heat exchanger positioned to be external to the internal gas exhaust flow path of the HRSG, the external water-to-water heat exchanger having a first inlet for receiving feedwater, a second inlet, a first outlet and a second outlet;a deaerator located to be external to the internal gas exhaust flow path of the HRSG, the deaerator having at least one outlet and having a first inlet, and a second inlet;a first conduit path configured for flow connection there through, extending from flow connection with the first outlet of the external water-to-water heat exchanger to flow connection with the first inlet of the deaerator;a second conduit path configured for flow connection there through, extending from the at least one deaerator outlet to flow connection with the second inlet of the external water-to-water heat exchanger;a feedwater heater located within the internal gas exhaust flow path of the HRSG at a position upstream of the outlet of the HRSG, the feedwater heater having an outlet and having an inlet;a feedwater evaporator comprising coils of heat exchanger tubes which are located within the internal gas exhaust flow path of the HRSG, the feedwater evaporator coils having an outlet;a third conduit path configured for flow connection there through, extending from flow connection with the feedwater evaporator coils outlet to flow connection with the second deaerator inlet for communicating steam to the deaerator; anda fourth conduit path configured for flow connection there through, extending from flow connection with the second outlet of the external water-to-water heat exchanger to flow connection with the inlet of the feedwater heater. 23. The feedwater heater system of claim 22, further comprising: a second, low pressure, evaporator positioned to be upstream of the feedwater heater and downstream of the inlet of the HRSG, the second low pressure evaporator having an inlet; and an additional conduit configured for flow connection there through, extending in flow connection with the outlet of the feedwater heater to flow connection with the inlet of the second, low pressure, evaporator. 24. The feedwater heater system of claim 23, wherein the configuration of the flow paths among the external water-to-water heat exchanger, the feedwater heater, the feedwater evaporator and the deaerator allow the temperature of the feedwater discharged from the feedwater heater to be capable of being about the same as the operating temperature of the second, low pressure, evaporator. 25. The feedwater heater system of claim 22, the feedwater evaporator further comprising a steam drum located external to the internal gas exhaust flow path of the HRSG, the steam drum being positioned to be in the flow path of the third conduit to be in flow connection with the outlet of the feedwater evaporator coils and flow connection with the second inlet of the deaerator. 26. The feedwater heater system of claim 22 wherein the feedwater evaporator has an inlet for receiving water. 27. The feedwater heater system of claim 22, wherein the feedwater evaporator inlet is in fluid flow connection with the outlet of the feedwater heater, and an additional flow conduit extends from the feedwater heater to the feedwater evaporator through the feedwater evaporator inlet. 28. The feedwater heater system of claim 22 further comprising wherein the configuration of the external water-to-water heat exchanger, the feedwater heater and the feedwater evaporator allows the temperature of the feedwater initially entering the first inlet of the external water-to-water heat exchanger to be capable of initially having a temperature below that of the dew point of sulfuric acid in the exhaust gas, and the feedwater from the second flow path of the external water-to-water heat exchanger to the feedwater heater to be capable of entering the inlet of the feedwater heater at a temperature at about 140° F. 29. A process for heating feedwater for a heat recovery steam generator (HRSG) which said HRSG has a casing having an inlet and an outlet and an internal gas exhaust flow path there between, comprising: a water-to-water heat exchanger positioned to be external to the internal gas exhaust flow path of the HRSG, the external water-to-water heat exchanger having a first flow path and a second flow path, a first inlet for receiving feedwater, a second inlet, a first outlet and a second outlet;a deaerator positioned to be external to the internal gas exhaust flow path of the HRSG, the deaerator having at least one outlet and having a first inlet, and a second inlet;a feedwater heater located within the internal gas exhaust flow path of the HRSG at a position upstream of the outlet of the HRSG, the feedwater heater having an outlet and having an inlet;a feedwater evaporator comprising coils of heat exchanger tubes which said heat exchanger tubes are located within the internal gas exhaust flow path of the HRSG at a position upstream of the feedwater heater;a first conduit path configured for flow connection there through, extending from flow connection with the first outlet of the external water-to-water heat exchanger to flow connection with the first inlet of the deaerator;a second conduit path configured for flow connection there through, extending from the at least one deaerator outlet to flow connection with the second inlet of the external water-to-water heat exchanger;another conduit path configured for flow connection there through, extending from flow connection with the second outlet of the external water-to-water heat exchanger to flow connection with the inlet of the feedwater heater;directing the feedwater into the first flow path of the external water-to-water heat exchanger to elevate the temperature of the incoming feedwater;directing the feedwater from the first flow path of the external water-to-water heat exchanger through the first conduit and through the first deaerator inlet into the deaerator to remove gases from the feedwater;directing steam into the deaerator;directing the feedwater from the at least one deaerator outlet through the second conduit to the second inlet of the external water-to-water heat exchanger to the second flow path of the external water-to-water heat exchanger to elevate the temperature of the feedwater within the first flow path of the external water-to-water heat exchanger; anddirecting the feedwater from the second flow path of the external water-to-water heat exchanger from the second outlet of the external water-to-water heat exchanger through the another conduit to the inlet of the feedwater heater to elevate the temperature of the feedwater. 30. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 29, further comprising the steps of: a second, low pressure, evaporator positioned within the internal gas exhaust flow path to be upstream of the feedwater heater and downstream of the inlet of the HRSG; anddirecting the feedwater from the feedwater heater to the second, low pressure, evaporator, and passing the feedwater through the second, low pressure, evaporator to elevate the temperature of the feedwater. 31. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 29, further comprising the feedwater evaporator to also comprise a steam drum located external to the internal gas exhaust flow path of the HRSG, the steam drum with an inlet in flow connection with an outlet of the coils of the feedwater evaporator tubes; and directing the feedwater from the feedwater evaporator coils through the steam drum to the deaerator in the form of steam. 32. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 29, wherein the temperature of the feedwater initially entering the first inlet of the external water-to-water heat exchanger initially has a temperature below that of the dew point of sulfuric acid in the exhaust gas, and the feedwater from the second flow path of the external water-to-water heat exchanger to the feedwater heater enters the inlet of the feedwater heater at a temperature at about 140° F. 33. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 32 wherein the temperature of the feedwater discharged from the feedwater heater is about the same as the operating temperature of the second, low pressure, evaporator. 34. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 29 further comprising the feedwater evaporator with an inlet that is in fluid flow connection with the outlet of the feedwater heater, and a flow path extending from the feedwater heater to the feedwater evaporator, and directing the feedwater from the feedwater heater to the feedwater evaporator inlet. 35. The feedwater heater system of claim 5, wherein a flow conduit extends from the steam drum to the feedwater evaporator to provide fluid flow connection there through from the steam drum into the feedwater evaporator. 36. The process for heating feedwater for the heat recovery steam generator (HRSG) of claim 14, wherein a flow conduit extends from the steam drum to the feedwater evaporator, further comprising the steps of: directing deaerated fluid from the steam drum to the feedwater evaporator, and passing the deaerated fluid through the feedwater evaporator.
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