CASCADED ORGANIC RANKINE CYCLE (ORC) SYSTEM USING WASTE HEAT FROM A RECIPROCATING ENGINE
First Claim
1. A method of operating a cascaded organic Rankine cycle (ORC) system, the method comprising:
- vaporizing a first organic working fluid in a first ORC system using a high temperature heat source from a positive-displacement engine;
heating a second organic working fluid in a second ORC system using a low temperature heat source from the positive-displacement engine; and
vaporizing the second organic working fluid using heat from the first organic working fluid, wherein the first organic working fluid has a higher critical temperature than the second organic working fluid.
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Abstract
A method and system for operating a cascaded organic Rankine cycle (ORC) system (100) utilizes two waste heat sources from a positive-displacement engine (106), resulting in increased efficiency of the engine (106) and the cascaded ORC system (100). A high temperature waste heat source from the positive-displacement engine (106) is used in a first ORC system (102) to vaporize a first working fluid (118). A low temperature waste heat source from the positive-displacement engine (106) is used in a second ORC system (104) to heat a second working fluid (130) to a temperature less than the vaporization temperature. The second working fluid (130) is then vaporized using heat from the first working fluid (118). In an exemplary embodiment, the positive-displacement engine (106) is a reciprocating engine. The high temperature waste heat source may be exhaust gas and the low temperature waste heat source may be jacket cooling water.
170 Citations
22 Claims
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1. A method of operating a cascaded organic Rankine cycle (ORC) system, the method comprising:
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vaporizing a first organic working fluid in a first ORC system using a high temperature heat source from a positive-displacement engine; heating a second organic working fluid in a second ORC system using a low temperature heat source from the positive-displacement engine; and vaporizing the second organic working fluid using heat from the first organic working fluid, wherein the first organic working fluid has a higher critical temperature than the second organic working fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. (canceled)
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11. A waste heat recovery system comprising:
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a first organic Rankine cycle (ORC) system configured to vaporize a first organic working fluid using a high temperature waste heat source from a reciprocating engine, and to generate power using the first organic working fluid; a second organic Rankine cycle (ORC) system configured to receive heat from the first organic working fluid to vaporize a second organic working fluid, and to generate power using the second organic working fluid; and a heat exchanger configured to increase a temperature of the second organic working fluid using a low temperature waste heat source from the reciprocating engine and prior to vaporizing the second organic working fluid, wherein a critical temperature of the first organic working fluid is greater than a critical temperature of the second organic working fluid. - View Dependent Claims (12, 13, 14, 15, 17)
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16. (canceled)
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18. A method of operating a cascaded organic Rankine cycle (ORC) system having a first ORC system configured to circulate a first working fluid and a second ORC system configured to circulate a second working fluid, the method comprising:
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vaporizing the first working fluid in an evaporator of the first ORC system using exhaust gas from a reciprocating engine; heating the second working fluid upstream of an evaporator of the second ORC system using cooling water from the reciprocating engine; and vaporizing the second working fluid in the evaporator of the second ORC system using heat from the first working fluid of the first ORC system, wherein a critical temperature of the first working fluid is greater than a critical temperature of the second working fluid. - View Dependent Claims (19, 20, 21, 22)
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Specification