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Fuel injector and gas turbine

a fuel injector and gas turbine technology, applied in the direction of burners, combustion types, combustion processes, etc., can solve the problems of reduced combustion stability, increased parts cost, and reduced combustion oscillation, so as to reduce the amount of nitrogen oxides and suppress combustion oscillations

Inactive Publication Date: 2019-11-28
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a fuel injector and gas turbine that can effectively mix air and fuel gas without needing a longer premix tube. This reduces costs and improves combustion stability. The air and fuel gas are introduced through multiple through-holes, which strengthens the swirling flow of the air. This mixing results in reduced nitrogen oxides and less combustion oscillations. Overall, this patent provides a solution for effectively mixing air and fuel gas while minimizing the length of the premix tube.

Problems solved by technology

When the length of the premix tube is increased, costs of parts may increase or combustion stability may decrease to cause combustion oscillations.

Method used

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  • Fuel injector and gas turbine
  • Fuel injector and gas turbine
  • Fuel injector and gas turbine

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first embodiment

[0032]Next, a fuel injector and a gas turbine in a first embodiment of the present invention will be described on the basis of the drawings.

[0033]FIG. 1 is a configuration view illustrating a schematic configuration of the gas turbine in an embodiment of the present invention.

[0034]As illustrated in FIG. 1, a gas turbine 100 of the present embodiment includes a compressor 51, a plurality of combustors 52, and a turbine 53.

[0035]The compressor 51 compresses outside air Ao and generates compressed air A. The compressor 51 includes a compressor rotor 56, a compressor casing 57, and a plurality of compressor vane rows 58.

[0036]The compressor rotor 56 rotates around a gas turbine axis Ar. The compressor rotor 56 includes a compressor rotor shaft 59 and a plurality of compressor blade rows 60. The compressor rotor shaft 59 extends along the gas turbine axis Ar. The plurality of compressor blade rows 60 are attached to the compressor rotor shaft 59.

[0037]The compressor casing 57 covers the...

second embodiment

[0077]Next, a second embodiment of the present invention will be described on the basis of the drawings. A fuel injector of the second embodiment differs from the fuel injector 1 of the first embodiment described above only in the configuration of the guide part. Therefore, while referencing FIG. 2, parts the same as those in the first embodiment described above are denoted by the same references, and duplicate description thereof will be omitted.

[0078]As in the first embodiment, the fuel injector in the second embodiment includes a fuel supply pipe 8, a plurality of premix tubes 202, an upstream side plate 3, a downstream side plate 4, and an outer wall 5.

[0079]FIG. 5 is a view corresponding to FIG. 4 in the second embodiment of the present invention.

[0080]As illustrated in FIG. 5, the premix tube 202 is formed in a cylindrical shape extending in an axial direction Da (see FIG. 2). The premix tube 202 includes a tube body 21 and a guide part 22. As in the tube body 21 of the first ...

third embodiment

[0091]Next, a third embodiment of the present invention will be described on the basis of the drawings. A fuel injector of the third embodiment differs from the first and second embodiments only in the configuration of the guide part. Therefore, while referencing FIG. 2, parts the same as those in the second embodiment described above are denoted by the same references, and duplicate description thereof will be omitted.

[0092]FIG. 7 is a view corresponding to FIG. 4 in the third embodiment of the present invention.

[0093]As illustrated in FIG. 7, a premix tube 302 of the fuel injector of the third embodiment includes a tube body 21 and a guide part 22.

[0094]The tube body 21 includes a through-hole 23 which allows communication between an internal space S1 and an external space S2 at an end part 2a (see FIG. 2) on an upstream side Da1 thereof.

[0095]The guide part 22 guides air A introduced into the internal space S1 of the tube body 21 via the through-hole 23 in a swirling direction ar...

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Abstract

A fuel injector includes a premix tube, a fuel introduction unit, and a downstream side plate. The premix tube includes a tube body and a guide part. In the tube body, a through-hole which allows communication between an internal space and an external space is formed at an upstream side end part on a side close to the inlet port. The guide part extends from an end part of the through-hole in a circumferential direction centered on an axis of the premix tube to intersect both the circumferential direction and an axial direction in which the axis extends.

Description

BACKGROUND OF THE INVENTIONField of the Invention[0001]The present invention relates to a fuel injector and a gas turbine. Priority is claimed on Japanese Patent Application No. 2018-101761, filed in Japan on May 28, 2018, the content of which is incorporated herein by reference.Description of Related Art[0002]In a fuel injector such as a gas turbine or a boiler, an air-fuel mixture in which compressed air and fuel gas are mixed in advance is supplied to a combustor in many cases.[0003]Patent Document 1 discloses a fuel injector that ejects an air-fuel mixture in which compressed air and fuel gas are mixed from a plurality of ejection holes regularly formed on a circular substrate.PATENT DOCUMENTS[0004][Patent Document 1] Japanese Unexamined Patent Application, First Publication No. 2016-080214SUMMARY OF INVENTION[0005]In the fuel injector as described in Patent Document 1, it is desired to uniformly mix compressed air and fuel gas in order to reduce NOx (nitrogen oxides). Specifica...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F23R3/28
CPCF23R3/286F23R3/38F23D14/62
Inventor TADA, KATSUYOSHI
Owner MITSUBISHI HEAVY IND LTD