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Compressor and Method for Compressing Gaseous Fuel

a gaseous fuel and compressor technology, applied in the direction of liquid fuel engines, machines/engines, lighting and heating apparatus, etc., can solve the problems of increasing difficulty, pipelines may not have sufficient fuel pressure, and pressures will stay fixed for a considerable period, so as to reduce the volume of the chamber

Inactive Publication Date: 2011-02-24
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides an improved method for compressing gaseous fuel by ingesting gaseous fuel and air into a chamber, mixing them, and partially combusting the resulting mixture in a confined space to increase the pressure of the fuel. This method uses a compressor with a rotor and vanes to create a series of chambers with increasing and decreasing volumes. The air is injected into the chamber with a higher pressure than the fuel, and the volume of the chamber can be decreased for discharging the compressed fuel. The compressor can also include an igniter and a seal to minimize leakage and maximize evacuation. The compressor can have a cooling device for controlling pre-ignition. The technical effects of this invention include improved fuel compression, reduced energy loss, and improved engine performance."

Problems solved by technology

However, gas supply networks and pipelines have been designed for a fixed pressure and the huge infrastructure costs mean that these pressures will stay fixed for a considerable period.
It is observed that at extreme operating conditions the pipeline may not have sufficient fuel pressure to supply the gas turbine.
This difficulty may be increasingly encountered in the further evolution of gas turbine technology.
Up to now at off-design conditions either the power output of the engine can be limited, which may cause customer dissatisfaction, or a motor-driven fuel gas compressor can be used, which may add costs and erode efficiency because of the power drain.

Method used

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  • Compressor and Method for Compressing Gaseous Fuel

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first embodiment

[0035]the invention will now be described with reference to FIGS. 1 and 2. FIG. 1 schematically shows an inventive compressor 1 in a sectional view. FIG. 2 schematically shows an inventive compressor, as it is shown in FIG. 1, with a cooling device and a pressure compensation pipe. The compressor 1 in FIGS. 1 and 2 comprises a casing 2 and a rotor 3. The rotor comprises a rotor body 4, three slots 5 and three vanes 6. The angle between two neighbouring vanes 6 has a value of 120°. The rotor body 4 has a circular cross section. Generally, the rotor body 4 and / or the inner surface 27 of the casing 2 can have an oval, elliptic, circular or another appropriate cross section.

[0036]The rotor 3 is eccentrically placed inside the casing 2. Each vane 6 is at least partially located inside a slot 5 and protrudes radially outwards from the rotor body 4. Each vane 6 comprises a portion 28, which is adapted to move in and out of the slot 5 such that the vane 6 is in sliding contact with the inne...

third embodiment

[0056]Now the present invention will be described with reference to FIGS. 4 to 6. Elements corresponding to elements of the previous embodiments will be designated with the same reference numerals and will not be described again.

[0057]FIG. 4 shows an alternative inventive compressor 201 with twelve chambers in a sectional view. The casing 2 and the rotor body 4 of the compressor 201 in FIG. 4 have the same shape as in the compressor 101, which is described in the second embodiment. In contrast to the second embodiment, the rotor 3 in the FIGS. 4 to 6 comprises twelve vanes 6 which form twelve chambers 29A, 29B, 30A, 30B, 31A, 31B, 32A, 32B, 33A, 33B, 34A, 34B. The angle between two adjacent vanes 6 has a value of 30°. Two similar chambers 29A, 29B, 30A, 30B, 31A, 31B, 32A, 32B, 33A, 33B, 34A, 34B are located opposite to each other relating to the rotation axis of the rotor 3. In the direction of rotation 13 chamber 29A is followed by chamber 30A, which is followed by chambers 31A, 3...

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PUM

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Abstract

A method for compressing gaseous fuel is disclosed. The method includes, ingesting gaseous fuel into a chamber, ingesting air into the chamber and mixing the gaseous fuel with the air, igniting and partially combusting the resulting mixture of gaseous fuel and air in a confined space such that a predominant fraction of the gaseous fuel is not combusted, causing an increased temperature and therefore an increased pressure of the fraction of the gaseous fuel which is not combusted, and discharging the resulting compressed gaseous fuel. Moreover, a compressor is provided including a casing, a rotor with at least three vanes, an inlet for gaseous fuel, an outlet for gaseous fuel, an air inlet and an igniter. The rotor is placed in the casing such that at least three variable-volume chambers part-bounded by the vanes are formed during a rotor revolution.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2009 / 050998, filed Jan. 29, 2009 and claims the benefit thereof. The International Application claims the benefits of European Patent Office application No. 08004162.7 EP filed Mar. 6, 2008. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The present invention relates to a method for compressing gaseous fuel, to a compressor and to a gas turbine.BACKGROUND OF INVENTION[0003]Modern gas turbines are evolving towards higher peak cycle pressures in order to increase fuel efficiency. Since the fuel, which is induced at a peak pressure, must be supplied with sufficient overpressure to account for valve losses, ingestion speeds and other flow issues, the fuel supply pressure must also rise. However, gas supply networks and pipelines have been designed for a fixed pressure and the huge infrastructure costs mean t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F23C99/00F23L17/00
CPCF01C1/3442F04C25/00F04C18/3442F01C11/008
Inventor KAY, PETERNILSSON, ULFSENIOR, PETER
Owner SIEMENS AG