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Double pinch criterion for optimization of regenerative rankine cycles

A pinch, post-heating technique applied in the field of double pinch criteria for optimization of regenerative Rankine cycles

Active Publication Date: 2014-12-03
MASSACHUSETTS INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the introduction of steam creates a small loss in turbine output, the preheating of the charge yields a net increase in overall efficiency

Method used

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  • Double pinch criterion for optimization of regenerative rankine cycles
  • Double pinch criterion for optimization of regenerative rankine cycles
  • Double pinch criterion for optimization of regenerative rankine cycles

Examples

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Embodiment Construction

[0050] The present invention discloses a system and method for optimizing a regenerative Rankine cycle including a double pinch criterion. In some embodiments, the efficiency of the Rankine cycle is enhanced by selecting operational variables such as exhaust pressure and exhaust flow rate such that a feedwater heater achieves a double pinch. In particular, the first pinch is taken at the onset of exhaust steam condensation and the second pinch is taken at the exhaust steam outlet of the feedwater heater. The minimum temperature difference at the first pinch point is substantially equal to the minimum temperature difference at the second pinch point. The present invention discloses a system of regenerative Rankine cycles associated with a double pinch criterion, a method of operating the system and a method of optimizing the operation of the system.

[0051] Some exemplary embodiments will now be described to provide an overview of the invention.

[0052] Based on an understa...

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Abstract

Systems and methods are disclosed herein that generally involve a double pinch criterion for optimization of regenerative Rankine cycles. In some embodiments, operating variables such as bleed extraction pressure and bleed flow rate are selected such that a double pinch is obtained in a feedwater heater, thereby improving the efficiency of the Rankine cycle. In particular, a first pinch point is obtained at the onset of condensation of the bleed and a second pinch point is obtained at the exit of the bleed from the feedwater heater. The minimal approach temperature at the first pinch point can be approximately equal to the minimal approach temperature at the second pinch point. Systems that employ regenerative Rankine cycles, methods of operating such systems, and methods of optimizing the operation of such systems are disclosed herein in connection with the double pinch criterion.

Description

technical field [0001] In some embodiments of the invention, the invention relates to a system using a regenerative Rankine cycle, a method of operating the system, and a method of optimizing a method of operating the system. In particular, the present invention relates to a double pinch criterion for optimizing a regenerative Rankine cycle. Background technique [0002] The well-known Rankine cycle and its variants such as the Kalina cycle or the organic Rankine cycle are used to generate about 80% of the world's electricity. The Rankine cycle can be applied to a wide range of energy sources, including fossil fuels, nuclear energy, geothermal energy, solar energy, and biofuels. The demand for electrical energy continues to grow, as does the use of the Rankine cycle. [0003] In a basic Rankine cycle, a working fluid such as water is pumped into a boiler where it is heated by an external heat source to produce steam. High-pressure steam is directed into a turbine, where i...

Claims

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Application Information

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IPC IPC(8): F01K25/08F01K23/10F01K7/16
CPCF01K17/06F01K7/40F22D1/325F01K13/02F01K25/08F01K7/24F01K7/22Y02E20/18F22D1/32G06F30/00F01K7/38F01K19/00F05D2200/34F05D2220/31F05D2260/221F05D2260/606F05D2270/20F05D2270/301F05D2270/303F05D2270/3061F05D2270/66G06F17/10
Inventor 胡萨姆·泽比安米佐斯·亚历山大
Owner MASSACHUSETTS INST OF TECH
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