JPH09243080A - Method for combustion using catalytic combustor and catalytic combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize a catalyst layer in strength and heat resistance and maintain the stability of a main combustion by burning an unburnt part remaining in a catalytic combustion pilot flame with a diffusion pilot flame, maintaining the catalytic combustion pilot flame and using it as a pilot flame for a premix combustion. SOLUTION: A diffusion flame pilot burner 101 is disposed at the center of a combustion device 104. A catalyst layer 102 is arranged on the outer periphery of the diffusion flame pilot burner 101. A premix nozzle 103 is provided outside the catalyst layer 102. A pilot flame formed by the diffusion flame pilot burner 101 ignites the unburnt part of partial combustion gas produced from a partial combustion in the catalyst layer 102 to burn the partial combustion gas so that the obtained flame is maintained as a catalytic combustion pilot flame and assuredly held. Premix fuel-air mixture for a main combustion supplied from the premix nozzle 103 is burnt by using the catalytic combustion pilot flame as a fire and the stability of the main combustion is maintained.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a catalytic combustor applied to a gas turbine or the like.

[0002]

2. Description of the Related Art An example of a conventional catalytic combustor will be described with reference to FIG. The air flowing into the combustor 204 through the air holes 201 forms a premixture with the fuel supplied in the Venturi section 202. Then, this premixed gas burns in the catalyst layer 203 provided immediately downstream.

[0003]

In the above-mentioned conventional one, since the catalyst layer 203 has a large shape, there is a problem in reliability due to its strength.

Further, since the premixed gas is burned in the catalyst layer 203, the temperature of the catalyst layer 203 becomes equal to or higher than the gas temperature, and the catalyst layer 2
The heat resistance of 03 itself becomes a problem.

An object of the present invention is to solve these problems in the conventional ones and to obtain a new one having excellent practicality and excellent strength and heat resistance.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, in which unburned components remaining in the catalytic combustion pilot flame formed around the diffusion pilot flame formed in the center of the combustor are removed. Providing a combustion method using a catalytic combustor that burns to secure a catalytic combustion pilot flame and uses this as a pilot flame for premixed combustion. Complete combustion of the remaining catalytic combustion gas to ensure a pilot flame here, and make the catalyst combustion small to burn the premixed gas stably while maintaining the reliability of the catalyst layer. It is a thing.

Further, according to the present invention, a diffusion flame pilot burner for forming a diffusion pilot flame is arranged at the center of the combustor,
A catalyst combustor is provided around the diffusion flame pilot burner to form a catalytic combustion pilot flame, and a premixing nozzle for supplying a premixed gas is provided outside the catalyst combustor. By arranging the diffusion flame pilot burner, the catalyst layer, and the premixing nozzle in this direction, the small diffusion pilot flame is transferred to the catalytic combustion pilot flame to ensure the ignition source and to achieve stable combustion of the premixture. It is the one that connects.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG.

A diffusion flame pilot burner 101 is arranged in the center of the combustor 104. 102 is a catalyst layer,
The fuel supplied from the premixed gas nozzle 106, which is arranged on the outer periphery of the diffusion flame pilot burner 101,
The premixed air mixed with air supplied separately is used for the catalyst layer 10
By passing 2 through it, catalytic combustion is performed here.

Reference numeral 103 denotes a premixing nozzle, which is the catalyst layer 10 described above.
It is provided outside of 2. Reference numeral 105 denotes a premixed mixture forming fuel nozzle, which is provided so as to project into the premixed nozzle 103. The fuel supplied from the premixed mixture forming fuel nozzle 105 and the air separately supplied are The premixture for main combustion is formed in the mixing nozzle 103.

The supply amount of the fuel and the air supplied to each of the above-mentioned parts is controlled by a normal means by a control device (not shown). That is, regarding the diffusion flame pilot burner 101, the fuel supply is limited to 3% or less of the total fuel, and regarding the catalyst layer 102, the fuel supply is limited to about 10% of the total fuel. In addition, in the catalyst layer 102, the amounts and ratios of the supplied fuel and air are controlled so that the premixed gas is only partially burned and the unburned fuel remains.

In this embodiment having such a configuration, the pilot flame formed by the diffusion flame pilot burner 101 ignites the unburned components in the partial combustion gas that has come out after partial combustion in the catalyst layer 102. The partial combustion gas of the lever is burned, the flame is secured as a pilot flame for catalytic combustion, and the flame is reliably retained. Then, using this catalytic combustion pilot flame as the ignition source, the main combustion premixed gas supplied from the premixing nozzle 103 is burned.

As described above, according to the present embodiment, in the catalytic combustion, the partial combustion, which is a small-scale combustion, is stopped to suppress the temperature rise of the catalyst layer, and the unburned component remaining in the partial combustion gas is reduced. In order to secure a stable ignition source by burning in the downstream, and to suppress the above-mentioned catalytic combustion to a small scale, the structure of the catalyst layer itself is miniaturized, so that the catalyst layer is strong, heat-resistant and safe. In addition, the stability of the main combustion can be ensured.

Although the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to such an embodiment.
It goes without saying that various modifications may be made to the specific structure within the scope of the present invention.

[0015]

As described above, according to the present invention, since the catalytic combustion gas is used only as a pilot flame for premixed combustion, a catalyst layer having a small shape is sufficient. Therefore, the structural strength of the catalyst layer is secured and the reliability can be improved.

Further, since a small amount of the diffusion flame pilot ignites and burns the unburned matter in the combustion gas partially burned in the catalyst layer, a pilot flame for premixed combustion of the main combustion is stably secured. In addition to that, by keeping the combustion rate in the catalyst layer low, the temperature of the catalyst layer does not rise and there is no need to worry about the heat resistance of the catalyst layer.

Furthermore, according to the second aspect of the present invention, by arranging the catalyst layer surrounding the diffusion flame pilot burner, the combustion of the catalyst layer is small, and even if it is partial combustion, the diffusion flame pilot burner In addition, in other words, by supplementing the diffusion flame pilot burner, catalytic combustion can be made small, so that a small catalyst layer ensures structural strength while also having sufficient heat resistance, and a fire source It was possible to obtain one that was reliably held and stably burned.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a catalytic combustor according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional catalytic combustor.

[Explanation of symbols]

 101 Diffusion Flame Pilot Burner 102 Catalyst Layer 103 Premixing Nozzle 104 Combustor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Kouzuki, 3-3-22 Nakanoshima, Kita-ku, Osaka City, Kansai Electric Power Co., Inc. (72) Yoshimasa Tanaka 3--22, Nakanoshima, Kita-ku, Osaka Kansai Denryoku Co., Ltd. (72) Inventor Shigemi Bandai 1-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Tetsuo Gora 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture No. 1 Mitsubishi Heavy Industries, Ltd. Takasago Research Laboratory (72) Inventor Kuniaki Aoyama 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries Ltd. Takasago Works

Claims (2)

[Claims] 1. A catalyst pilot pilot flame is ensured by burning unburned components remaining in the catalyst combustion pilot flame formed around the diffusion pilot flame formed in the center of the combustor to secure a pilot flame for premix combustion. A combustion method using a catalytic combustor characterized by being used as a flame. 2. A diffusion flame pilot burner that forms a diffusion pilot flame is arranged in the center of the combustor, and a catalyst layer that forms a catalytic combustion pilot flame is arranged around the diffusion flame pilot burner, and a premixture is provided. A catalytic combustor characterized in that a premixing nozzle for supplying is disposed outside thereof.