JPH051813A - Gas burner with high pressure noise reducing device - Google Patents

Abstract

PURPOSE:To suppress and reduce noises and, at the same time, make small the diameter of the piping, valves and devices as a whole and reduce their weights. CONSTITUTION:In a fuel gas transporting pipe 22 (fuel gas introducing pipe 22A and fuel gas branch pipe 22B) that supplies the fuel gas from a high pressure fuel gas supply source to a gas nozzle 21 a plurality of orifice plates 23A and 23B are provided as throttling means. One orifice plate, for example 23A and a perforated plate 24 hold a metal perforated plate 25 between them. These plates 24, 25 constitute a noise reducing device. The end section of the fuel gas branch pipe 22B is formed in a perforated section 22C, and in its vicinity an extension plate 28 which has many small diameter holes 28A is provided to achieve pressure reduction and noise reduction effects.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure silencing gas burner device, and more particularly to a high-pressure silencing gas burner device suitable for application to heating furnaces, melting furnaces, incinerators and the like.

[0002]

2. Description of the Related Art When burning high-calorie, high-pressure gas such as purified gas such as natural gas with a burner,
In order to obtain ignition stability, the gas injection pressure at the burner nozzle is usually designed to generate a rated capacity at 1.5 kg / cm ² G.

As a conventional gas burner device, a structure shown in FIG. 4 is known. That is, in this structure, the spud nozzle 4 having a diverging shape is attached to the tip of the fuel gas branch pipe 3 which is divided into the plurality of gas burners 2 from the fuel gas introduction pipe 1, and the spud nozzle 4
A large number of nozzle holes 5 are provided at the tips of the nozzles, and a gas nozzle 6 is provided around the tips of these nozzle holes 5.

In the gas burner having such a structure, the fuel supply pressure is usually 7 to 8 kg / cm ² at the yard intake point.
G, sometimes several tens of kg / cm ² G, and sometimes fluctuating. Therefore, a pressure reducing valve is installed in the middle of the supply pipe to reduce the pressure after depressurization to 3 k in consideration of flow rate control.
It is set to about g / cm ² G. In this case, the pressure energy is not only destroyed by the pressure reducing valve, but is also a noise source.

FIG. 5 shows the pressure distribution of each part of this system, and the dotted line A shows a conventional general case where the pressure reducing device is not provided in front of the gas burner. All pressure loss fluctuations on the downstream side due to fluctuations in the source pressure and fluctuations in the flow rate must be absorbed by the pressure reducing valve and the flow control valve, and in particular, the control range of the pressure reducing valve is required to cover a considerably large range. To be done.

[0006]

In the above-mentioned conventional gas burner device, the noise generated by the pressure reducing valve is not significantly suppressed, and the piping, valves, and the entire device thereof are remarkably reduced in size. However, there was a problem that the weight was not reduced.

That is, in the past, as a method of depressurizing the fuel gas, a typical structure has been to use a pressure reducing valve, an orifice or the like. In this structure, a noise corresponding to that is generated. .. Particularly, in the case of using an orifice, for example, a differential pressure of 1.
If 5 kg / cm ² G is generated, the noise is about 85d.
It can be suppressed to B (A) or less.

Therefore, as shown in FIG. 5, an orifice is installed immediately in front of the gas burner to design 1.5 kg / c.
Many examples are known in which a differential pressure of about m ² G is provided, but this structure is limited up to that point, and the noise generated above that is a problem.

The present invention has been made in order to solve the problems of the prior art as described above, and it is intended to suppress noise and reduce noise, and to reduce the overall diameter and weight of pipes, valves and devices. An object of the present invention is to provide a high-pressure silencing gas burner device.

[0010]

In order to solve the above-mentioned problems, a high-pressure silencing gas burner device according to the present invention has a plurality of high-pressure fuel gas supply sources provided inside a transportation pipe for supplying fuel gas to a combustion nozzle. A single orifice plate, a perforated plate, and a sound deadening means composed of a porous body sandwiched between the perforated plate and one of the orifice plates, and an expansion plate provided immediately before the combustion nozzle and having a large number of holes. It is equipped with.

[0011]

According to the above means, the orifice plate serves as a throttling mechanism to bring about a pressure reducing effect. Moreover, the porous body of the sound deadening means brings about a pressure reducing effect and an anti-vibration effect in addition to the sound deadening effect by the subdivision of the flow and the dispersion of the pressure energy, and the perforated plate serves not only to hold the porous body but also to rectify and muffle Bring In addition, the expansion plate provides a pressure reduction and a sound deadening suppression effect due to a large number of holes, passage bending, and passage expansion.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a bird's-eye view showing a high pressure silencing gas burner apparatus according to a first embodiment of the present invention, with a part of the cross section shown in section. In this embodiment, a transport pipe 22 for supplying fuel gas to a gas nozzle 21 from a high pressure fuel gas supply source (not shown).
(Fuel gas introduction pipe 22A, fuel gas branch pipe 22B) A plurality of orifice plates 23A, 23B arranged inside
And a silencing means 26 comprising a perforated plate 24 and a perforated metal plate 25 sandwiched between the perforated plate 24 and one of the orifice plates 23A, and a large number of silencers arranged immediately before the spud nozzle 27. And an expansion plate 28 having a small diameter hole 28A.

In this embodiment, for example, 7 kg / cm
^It is assumed that the fuel gas is ² G, and the fuel gas is sent to the fuel gas introducing pipe 22A while maintaining 7 kg / cm ² G, and the fuel gas introducing pipe 22A is provided with a pair of two sheets. The pressure is reduced by 1.5 kg / cm ² G with the orifice plate 23A. After this, the metal porous body 2 provided on the downstream side
The noise is reduced by the muffling means 26 composed of the perforated plate 5 and the perforated plate 24, and the noise is sent to the downstream side. The fuel gas from the fuel gas introduction pipe 22A is then divided into a large number of fuel gas branch pipes 22B and guided to each gas burner.

In the middle of the process, the pressure was reduced by 2.5 kg / cm ² G by a set of ^two orifice plates 23B, the tip of the fuel gas branch pipe 22B was made into a porous portion 22C, and a large number of small diameter holes 28A were provided around it. Expansion plate 28 with decompression function
Then, 1.5kg / cm ² G was guided while being further reduced in pressure,
From the nozzle hole 29 at the tip of the spud nozzle 27, it passes through the gas nozzle 21 and is sent into the furnace and burned.

The above-mentioned orifice plates 23A, 23B
Has two orifice plates, each of which has a constant space, and has one large hole on the upstream side and a plurality of small holes (four holes in the figure) on the downstream side. Therefore, the number of holes and the diameter of each hole can be changed as needed.

The porous body 25, which is the main part of the sound deadening means 26, is made of, for example, a metal porous body, and has a three-dimensional mesh-like skeleton like sponge and all the pores. It is in communication with Ni-Cr material,
It is made of Ni material or the like. And the porosity can be up to 98%. The metallic porous body 25 eliminates vortices generated immediately after the orifice plate 23A and suppresses noise. According to an experiment, 20-25 dB
It has been confirmed that there is also a metal perforated plate having the sound deadening effect of (A).

Further, the spud nozzle 27 is arranged in parallel with the gas flow in order to reduce the pressure effectively and effectively.

The injection pressure of the gas burner 30 is set to about 1.5 kg / cm ² G as in the conventional case.

Further, while the injection pressure in the spud nozzle 27 is set to 1.5 kg / cm ² G as in the conventional case, since a sudden excessive pressure reduction causes dew phenomenon, the pressure is divided into several stages and brought close to the gas burner 30. It is arranged so that it is heated.

When the high-pressure muffling type is used as in this embodiment, the pressure distribution is distributed as shown by the solid line B in FIG. 5, the flow rate adjusting valve also serves as pressure adjustment, and the pressure reducing valve is omitted or reduced. The degree can be remarkably reduced and only the high pressure side safety valve can be provided without providing the low pressure side safety valve.

Next, FIGS. 2 and 3 are views showing high-pressure silencing gas burner devices according to second and third embodiments of the present invention, respectively. Fuel gas introduction pipe 22A and fuel gas branch pipe 22
The configurations of the transport pipe 22 made of B, the gas burner 30 and the like are the same as those in the first embodiment described above.

In addition, in the second embodiment shown in FIG. 2, in addition to the two orifice plates 23A and 23B being provided in both the fuel gas introduction pipe 22A and the fuel gas branch pipe 22B, the fuel No muffling means is arranged in the gas introduction pipe 22A, and a muffling means 26 composed of a metallic porous body 25 and a perforated plate 24 is arranged only in the fuel gas branch pipe 22B.

On the other hand, in the third embodiment shown in FIG.
In addition to the two orifice plates 23A and 23B being provided in both the fuel gas introducing pipe 22A and the fuel gas branching pipe 22B, a muffling means 26 composed of a metallic porous body 25 and a porous plate 24 is used as a fuel. It is configured to be arranged in both the gas introduction pipe 22A and the fuel gas branch pipe 22B.

In each of the embodiments shown in FIGS. 2 and 3, the porous portion 22 located at the tip of the fuel gas branch pipe 22B.
Although not shown in the figure, the sound deadening material composed of the above-mentioned metal porous body 25 is inserted and arranged in C, and the expansion plate 28 of the perforated box structure located around the perforated portion 22C of the fuel gas branch pipe 22B. Although not shown, a sound deadening material made of a metal porous body 25 may be inserted and arranged in the interior of the housing to simultaneously perform depressurization and sound deadening. Such a structure is applied especially when the generated noise is strictly controlled.

[0026]

As described above, according to the present invention, most of pipes, valves, and the entire apparatus thereof can be significantly reduced in diameter and weight. For example, according to the present invention, the injection pressure 1.
Injection pressure 7kg / compared to 5kg / cm ² G gas burner
With a gas burner of cm ² G, the required material can be reduced to about 32% in weight. That is, the weight is about 68.
It can be reduced by about%.

Further, according to the present invention, the pressure reducing valve can be dispensed with, or even if the pressure reducing valve is required, the degree of pressure reducing can be remarkably reduced, so that it does not become a noise source.

Further, according to the present invention, only the high pressure side safety valve needs to be installed, and the low pressure side safety valve having a large diameter and a large number can be dispensed with.

Furthermore, according to the present invention, even if a noise problem occurs, since it is limited to only the gas burner portion at the most downstream end, countermeasures can be concentrated. Therefore, it is possible to significantly reduce both the quantity and cost for noise reduction.

Although the spud nozzle is conventionally made of a complicated casting, it can be made of a simple welded box made of a plate material as a part of the decompressor, so that it can be constructed regardless of the quality of the material.

[Brief description of drawings]

FIG. 1 is a bird's-eye view showing a high-pressure silencing gas burner apparatus according to a first embodiment of the present invention, with a part thereof shown in section.

FIG. 2 is a bird's-eye view showing a high-pressure silencing gas burner device according to a second embodiment of the present invention with a part of the cross-section being shown in section.

FIG. 3 is a bird's-eye view showing a high-pressure silencing gas burner device according to a third embodiment of the present invention, with a part of the device shown in cross section.

FIG. 4 is a bird's eye view showing a part of a conventional gas burner device in section.

FIG. 5 is a diagram showing pressure distributions of the present invention and a conventional example.

[Explanation of symbols]

 21 Gas Nozzle 22 Transport Pipe 23A Orifice Plate 23B Orifice Plate 24 Perforated Plate 25 Porous Body 26 Silencer 28 Expansion Plate 28A Hole 30 Gas Burner

Claims (1)

Claim: What is claimed is: 1. A plurality of orifice plates provided inside a transportation pipe for supplying a fuel gas from a high-pressure fuel gas supply source to a combustion nozzle, a perforated plate, and the perforated plate and one of the aforesaid plates. A high-pressure silencing gas burner device comprising a silencing means made of a porous body sandwiched between an orifice plate and an expansion plate having a large number of holes provided immediately before the combustion nozzle.