SUPERCRITICAL CO2 POWER GENERATING SYSTEM FOR PREVENTING COLD-END CORROSION
First Claim
1. A power generating system using supercritical CO2 as a working fluid for driving a turbine, the system comprising:
- a plurality of heat exchangers for heating the working fluid using heat supplied from an external heat source, the plurality of heat exchangers including a low-temperature-side heat exchanger;
a pump for compressing the working fluid, the working fluid passing through the pump being branched into a first part of the working fluid and a second part of the working fluid for supplying the low-temperature-side heat exchanger;
at least one recuperator for exchanging heat between the working fluid passing through the turbine and the first part of the working fluid passing through the pump, to cool the working fluid from the turbine and to heat the working fluid from the pump; and
a condenser for cooling the working fluid primarily cooled by the at least one recuperator and supplying the cooled working fluid to the pump,wherein the second part of the working fluid passing through the pump is mixed with an additional part of the working fluid to be supplied to the low-temperature-side heat exchanger.
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Accused Products
Abstract
A supercritical CO2 power generating system prevents cold-end corrosion capable of improving reliability against cold-end corrosion by including a recirculation pump. Part of the working fluid heated in the low-temperature-side external heat exchanger using the recirculation pump is mixed with the low-temperature working fluid at the rear end of the pump, to heat the working fluid above the temperature of the dewpoint of the waste heat gas. The heated working fluid is then supplied to the external heat exchanger. By reducing the cold-end corrosion phenomenon of the low-temperature-side external heat exchanger, the life of the external heat exchanger can be increased and the reliability of the external heat exchanger and the supercritical CO2 power generating system can be improved.
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Citations
20 Claims
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1. A power generating system using supercritical CO2 as a working fluid for driving a turbine, the system comprising:
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a plurality of heat exchangers for heating the working fluid using heat supplied from an external heat source, the plurality of heat exchangers including a low-temperature-side heat exchanger; a pump for compressing the working fluid, the working fluid passing through the pump being branched into a first part of the working fluid and a second part of the working fluid for supplying the low-temperature-side heat exchanger; at least one recuperator for exchanging heat between the working fluid passing through the turbine and the first part of the working fluid passing through the pump, to cool the working fluid from the turbine and to heat the working fluid from the pump; and a condenser for cooling the working fluid primarily cooled by the at least one recuperator and supplying the cooled working fluid to the pump, wherein the second part of the working fluid passing through the pump is mixed with an additional part of the working fluid to be supplied to the low-temperature-side heat exchanger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power generating system using supercritical CO2 as a working fluid for driving a turbine, the system comprising:
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a plurality of heat exchangers for heating the working fluid using heat supplied from an external heat source, the plurality of heat exchangers including a low-temperature-side heat exchanger and at least one of a high-temperature-side heat exchanger and a middle-temperature heat exchanger; a pump for compressing the working fluid, the working fluid passing through the pump being branched into a first part of the working fluid and a second part of the working fluid for supplying the low-temperature-side heat exchanger; at least one recuperator for exchanging heat between the working fluid passing through the turbine and the first part of the working fluid passing through the pump, to cool the working fluid from the turbine and to heat the working fluid from the pump; a condenser for cooling the working fluid primarily cooled by the at least one recuperator and supplying the cooled working fluid to the pump; and a recirculation pump connected to an outlet of the low-temperature-side heat exchanger to recirculate part of the working fluid discharged from the low-temperature-side heat exchanger, wherein the low-temperature-side heat exchanger is supplied with a mixture of the working fluid passing through the recirculation pump and the second part of the working fluid passing through the pump. - View Dependent Claims (16, 17)
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18. A power generating system using supercritical CO2 as a working fluid for driving a turbine, the system comprising:
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a plurality of heat exchangers for heating the working fluid using heat supplied from an external heat source, the plurality of heat exchangers including a low-temperature-side heat exchanger and at least one of a high-temperature-side heat exchanger and a middle-temperature heat exchanger; a pump for compressing the working fluid, the working fluid passing through the pump being branched into a first part of the working fluid and a second part of the working fluid for supplying the low-temperature-side heat exchanger; at least one recuperator for exchanging heat between the working fluid passing through the turbine and the first part of the working fluid passing through the pump, to cool the working fluid from the turbine and to heat the working fluid from the pump; a condenser for cooling the working fluid primarily cooled by the at least one recuperator and supplying the cooled working fluid to the pump; and a recirculation pump connected to an inlet of the condenser to recompress part of the working fluid supplied to the condenser, wherein the low-temperature-side heat exchanger is supplied with a mixture of the working fluid passing through the recirculation pump and the second part of the working fluid passing through the pump. - View Dependent Claims (19, 20)
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Specification