JP3035088B2 - Gas turbine combustor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor for a gas turbine, and more particularly to a pilot torch for a combustor used in a commercial or industrial gas turbine.

[0002]

2. Description of the Related Art As shown in FIG. 3, a gas turbine combustor 1 generally has a pilot torch 2 disposed at the center thereof.
A plurality of main burners 3 are arranged concentrically therearound. In such a gas turbine combustor 1, the main burner 3 can normally perform combustion in a lean state with an extremely high air ratio, and is difficult to self-combust. Conventionally, a diffusion flame torch is used as the pilot torch 2.

[0003]

As described above, in the conventional gas turbine combustor 1, the diffusion flame torch 2 is used as a pilot torch for stable combustion of the lean fuel of the main burner 3. NO in gas turbine exhaust gas
It has been clarified from various experimental data that about 50% of x is generated by the diffusion flame torch 2, and therefore, reduction of NOx in the pilot torch has been an issue.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems of the prior art, and in addition to stable combustion of lean fuel in a main burner, combustion for a gas turbine equipped with a pilot torch capable of realizing low NOx. The purpose is to provide a vessel.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a centrally- located and ejecting ionized gas.
Plasma torch as a pilot torch
Multiple concentrically arranged and ejects premixed gas
And a gas turbine combustor provided with a main burner .

[0006]

[Function] The ions and active species contained in the plasma are highly reactive and promote the combustion reaction, and the plasma generates very little NO irrespective of the extended Zeldbitch mechanism. By using the plasma torch as the pilot torch of the combustor, the combustion stabilization of the gas turbine combustor and the reduction of NOx are simultaneously performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing an example of a gas turbine combustor according to the present invention. 1, a gas turbine combustor 11 has a configuration in which a pilot torch 12 is arranged at the center and a plurality of main burners 13 are arranged concentrically around the pilot torch 12, similarly to the conventional example shown in FIG. I have. According to the present invention, a plasma torch is used as the pilot torch 12.

As shown in FIG. 2, in the plasma torch 12, an electric field is formed between a positive electrode 14 and a negative electrode 15 by a power supply 16, and the electric field is introduced into the plasma torch 12 by the electric field. 17 is ionized and becomes a plasma 17 '(see FIG. 1). On the other hand, as shown in FIG.
Of the premixed gas 20 is supplied.
0 is ignited by the energy of the plasma 17 ', thereby stabilizing the combustion of the gas turbine combustor 11 and reducing NOx at the same time.

That is, the plasma torch is composed of Ar, H ₂ ,
This is a device for ionizing a gas flow such as CO ₂ by an electric field. The plasma contains many ions and active species having higher energy levels than ordinary molecules and atoms. It is known that the ions and active species in these plasmas have higher reactivity than ordinary gases and promote the combustion reaction. Therefore, by using the plasma torch 12 as the pilot torch of the gas turbine combustor 11, the lean fuel gas of the main burner 13 can be stably burned.

In general, the generation of NOx is explained by the following enlarged Zeldbitch mechanism.

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[0012] Since plasma such as Ar, H ₂ , and CO ₂ is not directly related to the extended Zeldovich mechanism, generation of NO is extremely small. Therefore, by using the plasma torch 12 as the pilot torch of the gas turbine combustor 11, in addition to stabilizing the combustion of the gas turbine combustor, low NOx can be realized at the same time. 67 with main burner as shown
%, Pilot torch 50%, total 58%, NOx
Was able to be reduced.

[0013]

[Table 1]

[0014]

As described above, according to the present invention, the pilot torch is arranged at the center, and
In a gas turbine combustor having a main burner disposed therearound, by using a plasma torch for ejecting ionized gas as the pilot torch, the combustion stabilization of the gas turbine combustor and the reduction of NOx can be simultaneously realized. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of a gas turbine combustor according to the present invention.

FIG. 2 is a schematic configuration diagram showing an example of a plasma torch used as a pilot torch according to the present invention.

FIG. 3 is a front view showing a conventional gas turbine combustor.

[Explanation of symbols]

 Reference Signs List 11 Combustor for gas turbine 12 Plasma torch (pilot torch) 13 Main burner 14 Positive electrode 15 Negative electrode 16 Power supply 17 Plasma gas 17 'Plasma 18 Fuel 19 Air 20 Premix gas

Continuation of front page (72) Inventor Yasuhiro Iwamura 1-8-1 Koura, Kanazawa-ku, Yokohama-shi, Kanagawa 1 Mitsubishi Electric Corporation Basic Technology Research Laboratory (56) References JP-A-4-136603 (JP, A) JP-A Sho 62-62116 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23Q 9/00 F23C 11/00 309 F23R 3/18

Claims (1)

(57) [Claims] 1. A centrally located and ejecting ionized gas
Plasma torch as pilot torch and concentrically arranged around it and ejects premixed gas
A gas turbine combustor provided with a plurality of main burners .