JPH0221116A - Combustion noise reduction device - Google Patents

Abstract

PURPOSE:To reduce the generation of noise during combustion by installing a secondary air tuner so that its upper end may be located at a position lower than a flame port on the upper part of a line-shaped burner. CONSTITUTION:Line-shaped burners 2 installed inside a combustion shell 2 are laid out in a row with a ventilation clearance for a secondary air between them. A secondary air tuner 8 is installed above between the line-shaped burners 3 so that its upper end may located at a position lower than a flame port side 2a. This tuner 8 prevents the secondary air from spreading to the flame port side as much as possible and stops the generation of secondary air current which makes it possible to hold down the shaking of flames and reduce combustion noise.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is particularly applicable to the low frequency range (100 to 50
This invention relates to a combustion noise reduction device that reduces the noise of 01(z).

(Prior Art) Conventionally, a combustion apparatus of a type in which a plurality of line-shaped burners a are arranged side by side with a secondary air ventilation gap provided between them in a combustion shell to which combustion air is forcibly supplied is known. It will be done. However, as shown in Fig. 4, the secondary air flowing through the ventilation gap flows along the sides of each linear burner a, and is pushed by the secondary air flowing through the center of the ventilation gap into the linear shape. The secondary air tends to flow toward the burner face near the burner face, and the flow is not constant and constantly changes, causing the flame to oscillate and generate noise in the low frequency range.

Conventionally, this kind of noise has been reduced by attaching sound-absorbing materials to the exhaust pipe or intake port.

(Problem to be Solved by the Invention) However, with this sound absorbing material, it was difficult to absorb particularly low frequency noise.

An object of the present invention is to provide a device that reduces low frequency noise generated during combustion.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a plurality of linear burners in a combustion barrel to which combustion air is forcibly supplied, and a secondary air ventilation gap between them. In the case where the burners are arranged side by side, a secondary air conditioner is provided at a position above the line-shaped burners and below the flame opening surface of the line-shaped burners, and whose upper end faces out.

(Function) With the device having the above configuration, it is possible to suppress the flow of secondary air flowing through the center of the ventilation gap, thereby making it possible to prevent the secondary air from moving toward the flame opening. This makes it possible to prevent the flame flow from being swayed by the secondary air flow, which is free to flow in any direction without being regulated, and to prevent combustion noise from being generated as much as possible.

(Example) An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawing, 1 is the combustor main body, 2 is the combustion shell installed in this, and 3 is the combustor main body.
shows a plurality of line-shaped burners provided in the combustion shell 2, the line-shaped burners 3 are arranged in parallel with a secondary air ventilation gap between them, and each line-shaped burner 3 has a The fuel gas is supplied to each burner 3 through a manifold pipe 4 equipped with a gas nozzle 4a facing each burner 3. Reference numeral 5 indicates a blower connected to the lower part of the combustion shell 2 for forcibly supplying combustion air, 6 indicates a water heat exchanger provided at the upper part of the combustion shell 2, and 7 indicates an exhaust passage connected to the upper part.

In such a device, the present invention provides the linear burner (2)
(2) is provided with a secondary air tuner 8 whose upper end faces a position below the burner port surface 2a of the linear burner 2, which is located above the burner 2; As the tuning body 8, a round bar with a diameter of about 3 was provided along the length direction of each linear burner 3 at a position about 511I11 lower than the burner mouth surface 2a.

In this case, the round rod can be used to suppress the flow of secondary air flowing through the center of the ventilation gap, which allows the secondary air to flow toward the flame outlet as shown by solid line A in Figure 4. It was possible to suppress this as much as possible, and also to suppress the generation of secondary air flow with no fixed direction as shown by the chain line B, thereby suppressing the fluctuation of the flame, thereby reducing the combustion noise. According to experiments, it was possible to reduce the number of horns from the 53rd to the 54th horns to 50 or less when the tuning body 8 was not provided.

In the case shown in Fig. m3, a metal plate was provided as a tuner 8 in the ventilation gap II, extending from the lower end of the line burner to a position about 6 degrees below the flame opening surface 2a. When hiding,
The metal plate was able to suppress the flow of secondary air flowing through the center of the ventilation gap, and this also made it possible to prevent the flame from swinging due to the flow of secondary air toward the flame opening.

(Effects of the Invention) As described above, according to the present invention, by providing a secondary air tuner whose upper end faces a position below the burner opening surface of the linear burner, which is located above the linear burner, the secondary air conditioner is provided. Next, the air flows toward the flame port side, preventing the flame from swinging as much as possible, thereby making it possible to minimize the noise generated during combustion.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view showing one example of implementing the present invention, Fig. 2 is an enlarged view of the main part thereof, Fig. 3 is an enlarged side view of the main part showing another embodiment, and Fig. 4 is a conventional example. FIG. 1... Combustor main body 3... Line burner 8.
・・Synchronous body patent application Hito Rinnai Co., Ltd. Il-Kin Kitamura-i, ＼ Figure 3

Claims (1)

[Claims] In a combustion cylinder to which combustion air is forcibly supplied, a plurality of line-shaped burners are arranged side by side with a secondary air ventilation gap between them, and the upper part between the line-shaped burners is A combustion noise reduction device comprising a secondary air tuner having an upper end facing below the flame opening surface of the linear burner.