Valves for gas-turbines and multipressure gas-turbines, and gas-turbines therewith

a gas turbine and multi-pressure technology, applied in the field of gas turbines, can solve the problems of not being able to meet sudden increase power demand, less efficient at part load, and not well known gas turbine applications in the field of work-producing motors, and achieve the effect of reducing the oxygen content of the combustible mixture and reducing the amount of nox produced

Inactive Publication Date: 2011-10-27
ETV ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0037]b) during inverse Brayton cycle operation of the gas-turbine, directing fluid from the compressor to the heat-exchanger cold-stream inlet through the conduit so that a portion of the fluid entering the heat-exchanger cold-stream inlet is from the com...

Problems solved by technology

However, in spite of their potential, gas-turbines are currently not well known in applications requiring work-producing motors—for example ground vehicles such as cars and trucks—for several reasons.
One reason is that a given gas-turbine may generate a certain power at high efficiency for a prescribed load, but is less efficient at part load, particularly if turbine speed is maintained.
Thus, if turbine speed is reduced when power demand is low, a sudden increased power demand can be met only after a noticeable time lag.
A third reason is that the life...

Method used

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  • Valves for gas-turbines and multipressure gas-turbines, and gas-turbines therewith
  • Valves for gas-turbines and multipressure gas-turbines, and gas-turbines therewith
  • Valves for gas-turbines and multipressure gas-turbines, and gas-turbines therewith

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Embodiment Construction

[0068]Some embodiments of the invention relate to multiport valves that allow switching between high-pressure operation (Brayton cycle) and low-pressure operation (inverse Brayton cycle) modes of a gas-turbine.

[0069]Some embodiments of the invention relate to multiport valves that allow operation of a gas-turbine in high-pressure, low-pressure and intermediate pressure modes.

[0070]Some embodiments of the invention relate to multiport valves that allow operation of a gas-turbine at a variable power output in high-pressure modes and / or low-pressure modes at relatively high efficiency by varying the mass flow through the gas-turbine. Some embodiments of the invention relate to valves that allow simple and efficient varying of the pressure, mass flow and power output of a gas-turbine, that in some embodiments is substantially continuous.

[0071]Some embodiments of the invention relate to gas-turbines operating in a low-pressure mode (inverse Brayton mode) having reduced NOx emissions as w...

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Abstract

A multiport valve suitable for use with a gas-turbine allowing switching of a mode of gas-turbine operation between a Brayton cycle and an inverse Brayton cycle, and a gas-turbine configured to switch between a high-pressure operation mode according to a Brayton cycle and a low-pressure operation mode according to an inverse Brayton cycle employing the valve are provided. Also provided are a method and apparatus for operating a gas-turbine according to an inverse Brayton cycle.

Description

RELATED APPLICATION[0001]The present application gains priority from U.S. Provisional Patent Application No. 61 / 116,394 filed 20 Nov. 2008 which is included by reference as if fully set forth herein.FIELD AND BACKGROUND OF THE INVENTION[0002]The present invention, in some embodiments, relates to the field of gas-turbines, and more particularly, but not exclusively, to gas-turbines operable in both high-pressure (Brayton cycle) and low-pressure (inverse Brayton cycle) modes. The present invention, in some embodiments, relates to the field of gas-turbines, and more particularly, but not exclusively, to gas-turbines operable in low-pressure mode (inverse Brayton cycle).[0003]Gas-turbines are known for being lightweight, reliable and requiring little maintenance compared to alternative work-producing motors, e.g. an internal combustion engine (ICE). Above all, gas-turbines are known for efficiently converting chemical energy stored in a combustible fuel to mechanical energy when working...

Claims

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Application Information

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IPC IPC(8): F01D5/08
CPCF01D17/10F02C1/08F02C9/18F02C7/08F02C6/006
Inventor LIOR, DAVID
Owner ETV ENERGY LTD
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