JP3999286B2 - Combustion method using catalytic combustor and catalytic combustor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a catalytic combustor applied to a gas turbine or the like.
[0002]
[Prior art]
An example of a conventional catalytic combustor will be described with reference to FIG.
The air flowing into the combustor 204 from the air hole 201 forms a premixed gas with the fuel supplied by the venturi unit 202.
This premixed gas burns in the catalyst layer 203 provided immediately downstream.
[0003]
[Problems to be solved by the invention]
In the above-described conventional one, since the catalyst layer 203 has a large shape, there is a problem in reliability in strength.
[0004]
Further, since the premixed gas is combusted in the catalyst layer 203, the temperature of the catalyst layer 203 is equal to or higher than the gas temperature, and the heat resistance of the catalyst layer 203 itself becomes a problem.
[0005]
An object of the present invention is to eliminate these problems in the conventional one and to obtain a new highly practical product excellent in strength and heat resistance.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above-mentioned problems, and formed a diffusion pilot flame in the center of the combustor, and formed by stopping the partial combustion that is steady and small-scale combustion around the periphery by the diffusion pilot flame. A combustion method using a catalytic combustor that burns unburned components remaining in the catalytic combustion pilot flame to secure the catalytic combustion pilot flame, and uses the catalytic combustion pilot flame as a pilot flame for premixed combustion, A small amount of diffusion pilot flame formed in the center of the combustor stops the partial combustion that becomes steady and small-scale combustion in the catalyst layer and completely burns the catalyst combustion gas that has left unburned, By ensuring a pilot flame, the premixed gas can be burned stably while maintaining the reliability of the catalyst layer in strength and heat resistance by reducing catalyst combustion on a small scale A.
[0007]
Further, according to the present invention, a diffusion flame pilot burner that forms a diffusion pilot flame is arranged in the center of the combustor, and catalytic combustion is performed around the diffusion flame pilot burner by stopping partial combustion that is steady and small-scale combustion. A catalyst layer for forming a pilot flame is disposed, and a premixing nozzle for supplying a premixed gas is disposed outside the catalyst layer, and an unburned portion remaining in the catalyst combustion pilot flame by the diffusion pilot flame. To ensure a catalytic combustion pilot flame, and to provide a catalytic combustor that uses the catalytic combustion pilot flame as a pilot flame for burning the premixed gas. layer, successively disposed a premixing nozzle, small diffusion pilot flame catalytic combustion pie left stop and unburned the partial combustion of a constant a and small burn the By reliably secure the spark transferred to Tsu bets flame is obtained as linking to a stable combustion of the premixed gas under small catalytic combustion.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG.
[0009]
A diffusion flame pilot burner 101 is disposed in the center of the combustor 104. A catalyst layer 102 is disposed on the outer periphery of the diffusion flame pilot burner 101. A premixed gas obtained by mixing fuel supplied from the premixed gas nozzle 106 with separately supplied air is passed through the catalyst layer 102. Through this, catalytic combustion is performed here.
[0010]
Reference numeral 103 denotes a premixing nozzle, which is provided outside the catalyst layer 102.
A premixed gas forming fuel nozzle 105 is provided so as to enter the premixed nozzle 103, and the fuel supplied from the premixed gas forming fuel nozzle 105 and the separately supplied air are preliminarily provided. A premixed gas for main combustion is formed in the mixing nozzle 103.
[0011]
Note that the amount of fuel and air supplied to each of the above parts is controlled by ordinary means by a control device (not shown).
That is, the diffusion flame pilot burner 101 is limited to supply of 3% or less of the total fuel, and the catalyst layer 102 is supplied with fuel of at most about 10% of the total fuel. In addition, in the catalyst layer 102, the amount and ratio of the supplied fuel and air are controlled so that the premixed gas is only partially combusted and unburned is left.
[0012]
In the present embodiment configured as described above, the pilot flame formed by the diffusion flame pilot burner 101 is ignited by the unburned portion in the partial combustion gas that is generated by partial combustion in the catalyst layer 102 and this part is ignited. Combustion gas is combusted, and this is used as a catalytic combustion pilot flame to secure a flame and securely hold the flame.
Then, the main combustion premixed gas supplied from the premixing nozzle 103 is burned using this catalytic combustion pilot flame as a fire type.
[0013]
Thus, according to the present embodiment, in catalytic combustion, partial combustion that is small-scale combustion is stopped to suppress the temperature rise of the catalyst layer, and the unburned portion remaining in this partial combustion gas is wake In addition to ensuring a stable fire type by burning the catalyst, the catalyst combustion is reduced in size by minimizing the structure of the catalyst layer, thereby making the catalyst layer safe in terms of strength and heat resistance, and The stability of the main combustion can be ensured.
[0014]
Although the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to such an embodiment, and it goes without saying that various modifications may be made to the specific structure within the scope of the present invention. Absent.
[0015]
【The invention's effect】
As described above, according to the present invention, the catalyst combustion gas is only used as a pilot flame for the premixed combustion after the partial combustion which is a steady and small-scale combustion. Become.
Therefore, the structural strength of the catalyst layer is ensured, and the strength reliability can be increased.
[0016]
In addition, the unburned part in the combustion gas left after partial combustion, which is steady and small-scale combustion in the catalyst layer, is ignited and burned by a small amount of diffusion flame pilot. In addition to being able to ensure a stable pilot flame for premixed combustion of the catalyst, by keeping the combustion rate in the catalyst layer low, the temperature of the catalyst layer does not increase and there is no concern about the heat resistance of the catalyst layer Is.
[0017]
Furthermore, according to the invention of claim 2, a catalyst layer is provided which forms a catalytic combustion pilot flame by centering on the diffusion flame pilot burner and stopping the partial combustion which is steady and small-scale combustion surrounding it. Thus, the combustion of the catalyst layer is small, and even in the case of partial combustion, this is supplemented by the diffusion flame pilot burner, in other words, the catalyst combustion can be reduced by the supplement of the diffusion flame pilot burner. Thus, it is possible to obtain a suitable catalytic combustor that ensures the structural strength with a small catalyst layer and has sufficient heat resistance, and that reliably holds the fire type and performs stable combustion.
[Brief description of the 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

Claims (2)

A diffusion pilot flame is formed in the center of the combustor , and the unburned portion remaining in the catalytic combustion pilot flame formed by stopping the partial combustion that becomes steady and small-scale combustion around it is burned by the diffusion pilot flame. A combustion method using a catalytic combustor characterized by securing a catalytic combustion pilot flame and using the catalytic combustion pilot flame as a pilot flame for premixed combustion. A catalyst in which a diffusion flame pilot burner that forms a diffusion pilot flame is arranged in the center of the combustor, and a catalytic combustion pilot flame is formed around the diffusion flame pilot burner by stopping partial combustion that is steady and small-scale combustion. And a premixing nozzle for supplying a premixed gas to the outside, and the diffusion pilot flame burns the unburned portion remaining in the catalytic combustion pilot flame to perform catalytic combustion. A catalytic combustor characterized by securing a pilot flame and using the catalytic combustion pilot flame as a pilot flame for burning the premixed gas.

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