JPS6339545Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention forms a combustion chamber within an inner wall, and forms a combustion gas outlet of the combustion chamber with a diameter smaller than that of the combustion chamber. A high-speed burner that has a hollow part formed outside of the part for the flow of cooling air, and a nozzle for jetting cooling air from the hollow part, specifically, the arrangement of the nozzle for jetting the cooling air. Regarding improvements.

[Prior art]

Previously, for example, Utility Model Publication No. 53-11869 and Utility Model Publication No. 11869
As shown in Japanese Patent No. 55-162725, a nozzle for jetting cooling air is installed so that the cooling air that has a cooling effect on the inner wall forming the combustion chamber is jetted from the hollow part into the combustion chamber. It was placed.

[Problem that the invention attempts to solve]

However, when the high-pressure and high-temperature combustion gas generated by almost complete combustion in the combustion chamber is ejected from the combustion gas nozzle at high speed, the tip of the burner body located around the combustion gas nozzle becomes hot. Because they come into direct contact with combustion gases, they reach extremely high temperatures, resulting in early thermal damage.

An object of the present invention is to make it possible to sufficiently suppress thermal damage at the tip of the burner body by an extremely simple means that only improves the nozzle arrangement.

[Means to solve the problem]

The characteristic configuration of the present invention is that the nozzle for jetting cooling air is arranged around the entire circumference of the combustion gas nozzle and approximately parallel to the direction in which the combustion gas is jetted from the combustion gas nozzle. The cooling air is disposed in the direction in which the cooling air is blown out, and its effects are as follows.

[Effect]

In other words, since the cooling air from the nozzle is ejected almost parallel to the entire circumference of the combustion gas jet, an air curtain is formed between the tip of the burner body and the combustion gas jet. This suppresses the contact between the burner and the combustion gas and forcibly cools the burner body.

Therefore, even though high-temperature combustion gas is ejected at high speed, thermal damage to the tip portion of the burner body can be effectively suppressed.

[Effect of idea]

As a result, it has become possible to sufficiently improve durability and provide a high-speed burner with a longer lifespan by improving the nozzle arrangement, which is advantageous in terms of manufacturing and cost.

〔Example〕

Next, examples will be shown with reference to drawings.

In the burner body with a double wall structure, the inner wall portion 1
A combustion chamber 2 is formed in the burner body 1A, a combustion gas jet nozzle 1 is formed with a diameter considerably smaller than that of the combustion chamber 2, and is provided at the tip of the burner body, and a spiral combustor 3 is connected to the combustion chamber 1 and It is attached to the rear end of the.

To form a spiral combustor, a large number of fuel gas injection holes 8 and 10 are formed around the periphery of a bottomed cylindrical fuel nozzle 9 connected to the gas port 7, and combustion air connected to the air port 4 is formed. The fuel gas from the ejection holes 8 and 10 is mixed with the combustion air that swirls in the air swirling chamber 6 due to the ejection from the suction port 5, and the air-fuel mixture is swirled in the combustion chamber 2. It is designed so that it burns while it is burning.

A hollow part 12 is formed by the outer wall part 11 on the outside of the inner wall part 11A, and the hollow part 12 is connected to the air port 4 through the air supply port 14, and the inner wall part 11A is burnt out due to the flow of cooling air in the hollow part 12. has been suppressed.

Nozzle 1 that blows out cooling air from hollow part 12
3 over almost the entire circumference of the combustion gas nozzle 1,
The cooling air is jetted out in the same direction as the combustion gas jetting direction, and the air curtain of the cooling air from the nozzle 13 prevents the tip of the burner body from being blown out by the jetting flow of the combustion gas. Burnout in some parts is suppressed.

The inner and outer wall portions 11A, 11 are made of metal or fired refractory (silicon carbide, silicon nitride, alumina, etc.).

The amount of air ejected from the nozzle 13 is preferably 5 to 30% of the theoretical amount of air required for combustion of the fuel gas.

[Another example]

Next, another embodiment will be described.

The nozzle 13 is either divided into a plurality of parts in the circumferential direction of the combustion gas injection port 1 or continuous in an annular shape.

The type of combustor 3 does not matter.

[Brief explanation of drawings]

The drawings are cross-sectional views showing embodiments of the present invention. 1... Combustion gas outlet, 2... Combustion chamber, 11A
...Inner wall part, 12...Hollow part, 13...Nozzle.

Claims (1)

[Scope of utility model registration request] A combustion chamber 2 is formed within the inner wall portion 11A, a combustion gas outlet 1 of the combustion chamber 2 is formed to have a smaller diameter than the combustion chamber 2, and a cooling air flow is provided outside the inner wall portion 11A. A high-speed burner having a hollow part 12 formed therein, and a nozzle 13 for spouting cooling air from the hollow part 12, the nozzle 13 extending over almost the entire circumference of the combustion gas outlet 1, The high-speed burner is arranged in a direction in which cooling air is ejected substantially parallel to the direction in which the combustion gas is ejected from the combustion gas ejection port 1.