Compound closed-loop heat cycle system for recovering waste heat and method thereof
First Claim
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1. A waste heat recovery system, comprising:
- a Brayton cycle system comprising;
a heater configured to circulate carbon dioxide vapor in heat exchange relationship with a hot fluid to heat the carbon dioxide vapor;
a first turbine coupled to the heater and configured to expand the carbon dioxide vapor;
a cooler; and
a compressor configured to compress the carbon dioxide vapor fed through the cooler; and
a Rankine cycle system coupled to the Brayton cycle system;
wherein the Rankine system comprises;
a first heat exchanger, a second heat exchanger, and a third heat exchanger, wherein the carbon dioxide vapor from the first turbine is circulated in heat exchange relationship with a vaporized working fluid sequentially via the first heat exchanger, the second heat exchanger, and the third heat exchanger to heat the working fluid;
wherein the cooler is configured to cool the carbon dioxide vapor fed through the first heat exchanger, the second heat exchanger, and the third heat exchanger;
a fourth heat exchanger configured to circulate the vaporized working fluid in heat exchange relationship with the carbon dioxide vapor fed from the compressor so as to heat the working fluida second turbine configured to expand the vaporized working fluid fed from the fourth heat exchanger via the first heat exchanger; and
a condenser configured to condense the vaporized working fluid fed from the second turbine via the third heat exchanger.
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Abstract
A waste heat recovery system includes a Brayton cycle system having an heater configured to circulate carbon dioxide vapor in heat exchange relationship with a hot fluid to heat carbon dioxide vapor. A Rankine cycle system is coupled to the Brayton cycle system and configured to circulate a working fluid in heat exchange relationship with the carbon dioxide vapor to heat the working fluid.
28 Citations
12 Claims
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1. A waste heat recovery system, comprising:
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a Brayton cycle system comprising; a heater configured to circulate carbon dioxide vapor in heat exchange relationship with a hot fluid to heat the carbon dioxide vapor; a first turbine coupled to the heater and configured to expand the carbon dioxide vapor; a cooler; and a compressor configured to compress the carbon dioxide vapor fed through the cooler; and a Rankine cycle system coupled to the Brayton cycle system;
wherein the Rankine system comprises;a first heat exchanger, a second heat exchanger, and a third heat exchanger, wherein the carbon dioxide vapor from the first turbine is circulated in heat exchange relationship with a vaporized working fluid sequentially via the first heat exchanger, the second heat exchanger, and the third heat exchanger to heat the working fluid;
wherein the cooler is configured to cool the carbon dioxide vapor fed through the first heat exchanger, the second heat exchanger, and the third heat exchanger;a fourth heat exchanger configured to circulate the vaporized working fluid in heat exchange relationship with the carbon dioxide vapor fed from the compressor so as to heat the working fluid a second turbine configured to expand the vaporized working fluid fed from the fourth heat exchanger via the first heat exchanger; and a condenser configured to condense the vaporized working fluid fed from the second turbine via the third heat exchanger. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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circulating carbon dioxide vapor in heat exchange relationship with a hot fluid to heat the carbon dioxide vapor via an heater of a Brayton cycle system; expanding the carbon dioxide vapor via a first turbine coupled to the heater of the Brayton cycle system; circulating the carbon dioxide vapor from the first turbine in heat exchange relationship with a vaporized working fluid sequentially via a first heat exchanger, a second heat exchanger, and a third heat exchanger of the Rankine cycle system to heat the vaporized working fluid; cooling the carbon dioxide vapor fed through the first heat exchanger, the second heat exchanger, and the third heat exchanger via a cooler of the Brayton cycle system; compressing the carbon dioxide vapor fed through the cooler via a compressor of the Brayton cycle system; circulating the vaporized working fluid in heat exchange relationship with the carbon dioxide vapor fed from the compressor so as to heat the vaporized working fluid via a fourth heat exchanger of the Rankine cycle system expanding the vaporized working fluid fed through the fourth heat exchanger, the first heat exchanger via a second turbine of the Rankine cycle system; and condensing the vaporized working fluid fed from the second turbine via the third heat exchanger, using a condenser of the Rankine cycle system. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification