JPH06147485A - Gas turbine burner - Google Patents

Abstract

PURPOSE:To obtain a low NOX gas turbine burner in which burning vibration can be suppressed by providing a space and surrounding an inner cylinder of the burner with a porous wall cylinder. CONSTITUTION:An inner cylinder 1 of a low NOX gas turbine burner is surrounded by providing a space 13 with a porous wall cylinder 12 having many pores 11. Accordingly, the cylinder 12 is operated as a resonance box, thereby suppressing a pressure variation to remarkably attenuating energy and amplitude of the vibration. The cylinder 12 is formed, for example, of stainless steel, and fixed to both edges of the cylinder 1 by welding. Thus, a gas turbine burner for lean burning fuel in the inner cylinder of the burner suppresses a burning vibration to become low NOX, thereby preventing damages of the inner cylinder and blades of the turbine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine combustor in which fuel is lean-burned inside a combustor inner cylinder, and more particularly to a structure for suppressing combustion oscillation.

[0002]

2. Description of the Related Art A priority issue as a pollution countermeasure for a gas turbine is a measure for reducing NO _X generated in a gas turbine combustor. As one of the measures currently implemented, a method of performing lean burn is adopted.

FIG. 3 is a cross-sectional view showing a conventional can-type or cannula-type combustor inner cylinder as an example of this low NO _X gas turbine combustor. In FIG. 3, the combustor inner cylinder 1
The primary combustion air 5 coming from the air introduction cylinder 3 and the louver 4 is concentrated in the combustion area 2 at the head of the fuel nozzle 6 by this.
The fuel 7 injected from the fuel tank 2 and the air 9 flowing in through the swirler 8 are made to burn leanly. And flame (combustion) by such lean combustion
The temperature decreases and the generated NO _X decreases.

[0004]

By the way, in such a conventional low NO _X gas turbine combustor, there is a problem that combustion oscillation occurs. That is, if the flame temperature is lowered by performing lean combustion, the acoustic natural frequency of the combustor gas flow path system may generate so-called combustion vibration that is thermally driven by the combustion. This combustion vibration is a low-cycle self-excited vibration in which the acoustic natural vibration of the system is driven by the fluctuation of the heat generation rate, the fluid pressure fluctuates, and when it is severe, fatigue causes the gas turbine combustor and the downstream gas turbine. May have damaged wings.

The present invention has been made in order to solve the problems of the prior art, and an object thereof is to provide a low NO _X gas turbine combustor capable of suppressing combustion oscillation.

[0006]

In order to solve the above problems, the present invention relates to a gas turbine combustor in which fuel is lean-burned inside a combustor inner cylinder, wherein the combustor inner cylinder is formed by a porous wall cylinder. It is surrounded by a space.

[0007]

According to the above-mentioned means, the perforated wall cylinder surrounding the inner cylinder of the gas turbine combustor with a space acting as a resonance box suppresses the pressure fluctuation, and the energy and amplitude of combustion vibration are suppressed. Decrease significantly.

[0008]

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 is a sectional view showing an inner cylinder of a gas turbine combustor according to an embodiment of the present invention, and FIG.
3 is a view taken along the line AA of FIG. 3, and the same parts as those shown in FIG.

As shown in FIGS. 1 and 2, according to the present invention, the inner cylinder 1 of the low NO _X gas turbine combustor has a large number of holes 1.
It is surrounded by a perforated wall cylinder 12 having a space 13 provided therein. Therefore, the perforated wall cylinder 12 acts as a resonance box, whereby the pressure fluctuation is suppressed, and the energy and amplitude of the combustion vibration are significantly attenuated. In addition, the perforated wall cylinder 1
2 is made of, for example, a stainless steel plate, and is fixed to both end edges of the combustor inner cylinder 1 by welding.

[0010]

As described above, according to the present invention, in the gas turbine combustor in which the fuel is lean burned inside the combustor inner cylinder, the combustor inner cylinder is surrounded by the space by the porous wall cylinder. As a result, the combustion vibration of the low NO _X gas turbine combustor is suppressed, damage to the combustor inner cylinder and the gas turbine blade due to the combustion vibration is prevented, and the reliability of the gas turbine is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an inner cylinder of a gas turbine combustor according to an embodiment of the present invention.

FIG. 2 is a view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing an inner cylinder of a conventional gas turbine combustor.

[Explanation of symbols]

 1 Combustor Inner Cylinder 6 Fuel Nozzle 7 Fuel 11 Hole 12 Perforated Wall Cylinder 13 Space

Claims (1)

[Claims] 1. A gas turbine combustor in which a fuel is lean-burned inside a combustor inner cylinder, wherein the combustor inner cylinder is surrounded by a porous wall cylinder so as to be surrounded by a space.