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Lean fuel porous injection combustion system

A combustion system, lean fuel technology, applied in combustion chambers, combustion methods, combustion equipment, etc., can solve the problems of difficult to achieve outward ignition, unreasonable distribution of nozzle equivalence ratio, etc., to achieve convenient layout, convenient ignition, and reduced area. Effect

Active Publication Date: 2015-01-07
CHINA UNITED GAS TURBINE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to solve the problem that the equivalent ratio distribution of nozzles in the existing combustion system is not reasonable enough, and the outward ignition is not easy to realize, resulting in insufficient combustion on the outside and high pollutant concentration

Method used

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Examples

Experimental program
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Embodiment 1

[0034] Such as Figure 5 and Figure 6 As shown, a fuel-lean porous injection combustion system of the present invention includes: a duty nozzle 2 located at the center of the combustion system, a plurality of main nozzles 3 arranged uniformly in a ring outside the duty nozzle 2, and a cover arranged outside the plurality of main nozzles 3 Cap 4, diversion bushing 5 and flame tube; the duty nozzle 2 adopts the diffusion or premixed combustion mode, and the downstream of the duty nozzle 2 is provided with a conical flame-stabilizing plate, which undertakes ignition and main flame-stabilizing functions; multiple main nozzles 3 The inlets and outlets are all fan-shaped, which are compatible with the annular geometric structure of the main nozzle 3 inlet and outlet, and are convenient for layout; multiple main nozzles 3 are provided with fuel injection devices 33, and the fuel injection devices 33 are equipped with There is a fuel injection hole 1; a fuel supply channel 32 is arr...

Embodiment 2

[0048] This embodiment is basically the same as Embodiment 1, the difference is that: the main nozzle 3 includes at least two layers, each layer includes a plurality of annularly distributed main nozzles 3, and the outlets of adjacent two layers of main nozzles 3 are arranged in a staggered manner (such as Figure 8 ). Each layer of main nozzles 3 is provided with a fuel supply channel 32, and one or more fuel nozzles 31 are connected to the fuel supply channel 32. When the overall size of the combustion system is large, this type of layout can be adopted to avoid the main nozzle The size of 3 is too large, which is not conducive to processing and installation.

Embodiment 3

[0050] This embodiment is basically the same as Embodiment 2, except that two adjacent layers of main nozzles 3 are connected to the same fuel supply passage 32 through pipes, and one or more fuel nozzles 31 are connected to the fuel supply passage 32. The layout method can effectively solve the problem of insufficient space between the main nozzles and reduce the structural complexity.

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Abstract

The invention belongs to the field of gas turbines, and discloses a lean fuel porous injection combustion system. The lean fuel porous injection combustion system comprises an on-duty nozzle positioned in the center of the combustion system, a plurality of main nozzles annularly and evenly distributed at the outer side of the on-duty nozzle, and cover caps and guide bushings arranged at the outer sides of the plurality of main nozzles, wherein inlets and outlets of the plurality of main nozzles are all fan-shaped; fuel injection devices are respectively arranged in the plurality of main nozzles, and are all provided with fuel injection holes; fuel supply channels are arranged at the inner sides or the outer sides of the plurality of main nozzles circularly and evenly distributed, and are respectively connected with the plurality of fuel injection devices; and the fuel supply channels are connected with at least one fuel spray pipe. The lean fuel porous injection combustion system effectively solves the difficulties in the aspects of structural layout and cooling design in the prior art, changes the equivalent ratio distribution curve, reduces the range of a flame tube overheat area, and enhances the combustion performance of the main nozzles.

Description

technical field [0001] The invention relates to the technical field of gas turbines, in particular to a lean fuel porous injection combustion system. Background technique [0002] figure 1 It is a typical combustion chamber head structure, the duty nozzle is arranged in the center, and multiple main nozzles are evenly arranged on the outside of the duty nozzle. The on-duty nozzle adopts the diffusion or premixed combustion mode, and a conical flame-stabilizing plate is installed downstream of the on-duty nozzle to enhance the flame-stabilizing performance of the entire combustion chamber head. The on-duty nozzle is responsible for ignition and main flame-stabilizing functions. A plurality of fuel nozzles are led out from the end cover, and respectively go deep into the area corresponding to the central axis of the main nozzle. Radial fuel injection devices and swirlers 34 are arranged on the fuel nozzles to inject fuel and enhance mixing. When the main nozzle adopts this s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23R3/28
Inventor 李珊珊井文明吕煊
Owner CHINA UNITED GAS TURBINE TECH CO LTD