JP2013213654A - Burner for boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner for a boiler capable of further effectively reducing noise at low cost, in a burner for a boiler applied to a furnace of a boiler or the like.SOLUTION: There is provided a burner 1 for a boiler including: a housing 3; a burner body 5 arranged in the housing; a fuel pipe 7 arranged throughout the inside and outside of the housing for supplying fuel to the burner body 5; and a silencer 10 formed of an acoustic material arranged at least on an inner peripheral surface of the fuel pipe 7. The noise of the boiler can be effectively reduced by the silencer 10 formed of the acoustic material.

Description

  The present invention relates to a boiler burner applied to a boiler furnace or the like.

  For example, in a boiler that burns gas fuel such as LNG (liquefied natural gas), the gas fuel is supplied to a burner at each stage through a gas storage tank fuel pipe (for example, see Patent Document 1). In such boilers, the gas supply pressure is reduced to a pressure suitable for burner combustion using a pressure reducing device such as a multistage orifice. Conventionally, this pressure reducing device has been thought to generate high-frequency noise.

  Therefore, a noise absorbing material such as a heat insulating material is pasted around the fuel pipe and the surface thereof is covered with an iron plate or mortar to form a soundproof lagging, thereby reducing noise during combustion (combustion noise).

JP 2002-61835 A

  However, the soundproofing means by the soundproofing lagging has a problem that the effect is limited due to the seam resulting from the restriction of construction and the weight restriction, and the construction cost increases. In some cases, sound absorption performance required by soundproof lagging cannot be achieved.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a boiler burner capable of reducing noise more effectively at low cost.

  In order to solve the above-mentioned problems, the present inventors have investigated in detail the actual machine that caused the noise problem in view of the prior art, and as a result, the noise is not high in the decompression device, and noise is generated in the burner nozzle portion. The present invention has been completed.

  The boiler burner of the present invention that solves the above-described problems includes a housing, a burner body disposed in the housing, a fuel pipe that is disposed over the inside and outside of the housing and supplies fuel to the burner body, and at least the And a silencer made of a sound absorbing material provided on the inner peripheral surface of the fuel pipe.

  According to the above configuration, the noise of the boiler can be effectively reduced by the silencer made of the sound absorbing material. In addition, since soundproof lagging is not required, a soundproof function can be added at a lower cost.

In the boiler burner, it is preferable that the silencer is provided in the fuel pipe outside the casing.
According to the above configuration, since it is not necessary to install a silencer inside the housing, it is easy to introduce into existing boiler equipment, and a soundproof function can be added at a lower cost.

In the boiler burner, the silencer may be provided in the fuel pipe in the burner wind box inside the casing.
According to the said structure, the noise of a burner wind box can further be reduced by arrange | positioning a silencer near the burner which is a sound source.

  The boiler burner has a multistage orifice, and the silencer is provided inside the casing and in front of the multistage orifice in the fuel pipe in the burner wind box and outside the casing. It is preferable.

  According to the said structure, the noise which generate | occur | produces in the whole piping system to a burner main body can be effectively reduced by providing at least three silencers.

  The boiler burner has a multistage orifice, and the silencer is provided inside the casing and outside the burner wind box and before and after the multistage orifice outside the casing. It is good also as a structure.

According to the said structure, the noise which generate | occur | produces in the whole piping system to a burner main body can be effectively reduced by providing at least three silencers.
Also, by placing a silencer outside the burner-style box, the burner-style box can be downsized compared to placing it inside the burner-style box, and the overall boiler size and cost are suppressed. can do.

  In the boiler burner, the silencer is disposed in a fuel pipe diameter-expanded portion having a diameter larger than the other range of the fuel pipe, and in the fuel pipe diameter-expanded section, and is smaller in diameter than the fuel pipe diameter-expanded portion. The cylindrical member is filled between the cylindrical member and the fuel pipe enlarged diameter portion, and extends in the axial direction so as to divide the cylindrical member into two passages inside the cylindrical member. And an existing sound absorbing material.

  According to the above configuration, the diameter of the fuel pipe is increased in the silencer portion, so that noise can be reduced while securing the gas supply amount. In addition, since the sound absorbing material is arranged not only between the tubular member and the fuel pipe but also inside the tubular member so as to divide the gas passage, the sound absorbing area is increased and noise is more effectively proposed. can do.

  In the boiler burner, the tubular member is formed of a punching metal, and has two partition walls extending in parallel with each other along an axial direction of the tubular member inside the tubular member. It is preferable that the material is filled between the partition walls.

  According to the present invention, the noise of the boiler can be effectively reduced by the silencer made of the sound absorbing material. In addition, since soundproof lagging is not required, a soundproof function can be added at a lower cost.

It is a schematic block diagram of the boiler burner which concerns on 1st embodiment of this invention. It is AA sectional drawing of FIG. 1, Comprising: It is sectional drawing of the silencer which concerns on embodiment of this invention. It is a schematic block diagram of the boiler burner which concerns on 2nd embodiment of this invention. It is a schematic block diagram of the boiler burner which concerns on 3rd embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
The boiler burner 1 according to the present embodiment is used for a gas-fired boiler 2, for example. The gas-fired boiler 2 includes a boiler casing 3, a furnace 4 accommodated in the boiler casing 3, a burner body 5 that supplies gas to the furnace 4 to burn, and a gas flow on the upstream side of the burner body 5. The main component includes an air box 6 that adjusts the fuel and a fuel pipe 7 that supplies fuel to the burner body 5. The fuel pipe 7 is connected to a gas storage tank (not shown).

  The fuel pipe 7 is provided with a flow rate adjusting valve 8 for adjusting the gas flow rate and a multistage orifice 9 for depressurizing and restricting the gas flow from the upstream side. Although a plurality of burner bodies 5 are provided, only one is shown in FIG.

A silencer 10 is provided on the fuel pipe 7 and outside the boiler housing. Specifically, the silencer 10 is disposed on the upstream side of the burner body 5 and outside the boiler housing 3 at a position close to the burner body 5.
As shown in FIG. 2, the silencer 10 includes a fuel pipe enlarged diameter portion 11 having a circular cross section formed by enlarging a part of the fuel pipe 7, and a sound absorbing material filled in the fuel pipe enlarged diameter portion 11. 12 and a tubular member 13 having a smaller diameter than the fuel pipe enlarged diameter portion 11.

  The tubular member 13 is a member made of a cylindrical punching metal (porous steel plate) that is disposed inside the fuel pipe enlarged diameter portion 11 and has a smaller diameter than the fuel pipe enlarged diameter portion 11. The sound absorbing material 12 is filled between the tubular member 13 and the fuel pipe enlarged diameter portion 11.

  Further, two partition walls 14 extending in parallel with each other along the axial direction of the fuel pipe 7 are provided in the tubular member 13, and a sound absorbing material is also provided between these partition walls 14 and the partition wall 14. 12 is filled.

  A punching metal is a mesh in which a plurality of holes are regularly formed in a predetermined steel plate. As the sound absorbing material 12, for example, glass wool, stainless wool, rock wool or the like can be employed.

  About each dimension, the cross-sectional area of the gas passage G is adjusted so that it may become substantially the same as the internal diameter of the fuel piping 7. FIG. Specifically, for example, when the diameter of the fuel pipe enlarged diameter portion 11 is 150 mm, the thickness of the sound absorbing material 12, that is, the distance between the partition walls 14 and the distance between the fuel pipe enlarged diameter portion 11 and the tubular member 13 are, for example, It is preferable to set it as 30 mm-50 mm. That is, the thickness of the sound absorbing material 12 is preferably about ¼ of the pipe diameter. By setting it as such thickness, the noise which has a peak in 2 kHz-4 kHz can be suppressed.

  Further, the dimensions of each part are not limited to the above dimensions, but are appropriately determined according to the capacity of the burner body 5 and the required amount of noise reduction. Furthermore, the length of the silencer 10 in the axial direction is also determined according to the required amount of noise reduction.

  The multistage orifice 9 is provided on the downstream side of the flow rate adjusting valve 8 and reduces the gas supply pressure to a pressure suitable for the combustion of the burner body 5.

  According to this embodiment, the noise of the boiler can be effectively reduced by the silencer 10 made of the sound absorbing material 12. In addition, since soundproof lagging is not required, a soundproof function can be added at a lower cost.

Moreover, since it is not necessary to install a silencer inside the boiler housing 3, it is easy to introduce into existing boiler equipment, and a soundproofing function can be added at a lower cost.
Moreover, the noise of the burner wind box 6 can be further reduced by disposing the silencer 10 closer to the burner body 5 as a sound source.

  Furthermore, since the diameter of the fuel pipe 7 is increased in the silencer 10, noise can be reduced while ensuring the gas supply amount. Further, since the sound absorbing material 12 is arranged not only between the tubular member 13 made of punching metal and the fuel pipe enlarged diameter portion 11 but also inside the tubular member 13 so as to divide the gas passage, it is more effective. Noise can be proposed.

(Second embodiment)
Next, the boiler burner 1B according to the second embodiment will be described.
As shown in FIG. 3, a boiler burner 1 </ b> B according to this embodiment is used for a gas-fired boiler 2 </ b> B, and is characterized in that a silencer 10 is disposed inside a burner wind box 6. That is, the silencer 10 of this embodiment is disposed at a position closer to the burner body 5 than the silencer 10 of the first embodiment.

  It is preferable to employ the boiler burner 1B of the present embodiment particularly when a gas-fired boiler 2B is newly designed.

  According to the above embodiment, the silencer 10 is located near the burner body 5 serving as a noise source by installing the silencer 10 inside the burner wind box 6. Can be further reduced.

(Third embodiment)
Next, the boiler burner 1C according to the third embodiment will be described.
As shown in FIG. 4, a boiler burner 1 </ b> C according to the present embodiment is used for a gas-fired boiler 2 </ b> B, and a silencer 10 is outside the burner wind box 6 and is close to the burner body 5. 3 and before and after the multistage orifice 9. That is, the silencer 10 of the present embodiment is arranged in at least three locations in the boiler housing 3, upstream and downstream of the silencer 10.

  The distance L between the multistage orifice 9 and the silencer 10 is (L =) 3D to 5D, where D is the inner diameter of the fuel pipe 7. That is, the silencer 10 is not arranged at the time of the multistage orifice 9, and the multistage orifice 9 and the silencer 10 are arranged apart from each other.

According to the said embodiment, the noise which has generate | occur | produced in the whole piping system to the burner main body 5 can be reduced effectively.
Further, by sufficiently separating the multi-stage orifice 9 and the silencer 10, uneven flow can be eliminated and uneven flow rate can be suppressed.
Further, by arranging the silencer 10 outside the burner-style box 6, the burner-style box 6 can be downsized compared with the case where the silencer 10 is arranged inside the burner-style box 6, and the entire boiler is increased in size and costs. It can be suppressed.

  In the above-described embodiment, the silencer 10 is arranged outside the burner wind box 6. However, the present invention is not limited to this, and the silencer 10 is installed in the burner wind box 6 if there is no problem in increasing the size of the boiler. You may arrange | position inside.

Moreover, the silencer 10 on the most downstream side is not necessarily arranged inside the boiler casing 3, and may be arranged outside the boiler casing 3 as long as the position is close to the burner body 5.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the silencer is not limited to a cylindrical shape, and may be a rectangular tube shape. In addition, the width and quantity of the sound absorbing material that divides the gas passage can be appropriately changed according to the required specifications.

1 Boiler burner 2 Gas-fired boiler 3 Boiler casing (casing)
4 Furnace 5 Burner body 6 Burner wind box 7 Fuel piping 8 Flow rate adjusting valve 9 Multi-stage orifice 10 Silencer 11 Fuel piping enlarged portion 12 Sound absorbing material 13 Cylindrical member 14 Partition wall

Claims (7)

A housing,
A burner body disposed in the housing;
A fuel pipe arranged over the inside and outside of the housing for supplying fuel to the burner body;
A boiler burner comprising: a silencer made of a sound absorbing material provided at least on an inner peripheral surface of the fuel pipe.   The boiler burner according to claim 1, wherein the silencer is provided in the fuel pipe outside the casing.   The boiler burner according to claim 1 or 2, wherein the silencer is provided in the fuel pipe in the burner wind box inside the casing. With multi-stage orifices,
4. The boiler according to claim 3, wherein the silencer is provided inside the casing and before and after the multistage orifice in the fuel pipe in a burner wind box and outside the casing. 5. Burner. With multi-stage orifices,
2. The boiler according to claim 1, wherein the silencer is provided inside the casing and outside the burner wind box, and before and after the multistage orifice outside the casing. Burner. The silencer has a fuel pipe diameter-expanded portion that is larger than the other range of the fuel pipe;
A cylindrical member disposed inside the fuel pipe diameter-enlarged portion, and having a smaller diameter than the fuel pipe diameter-enlarged portion;
A sound absorbing material that is filled between the cylindrical member and the fuel pipe diameter-enlarged portion, and that extends in the axial direction so as to divide the cylindrical member into two passages inside the cylindrical member; The boiler burner according to any one of claims 1 to 5, wherein the boiler burner is provided. The cylindrical member is formed of punching metal,
Two partition walls extending in parallel with each other along the axial direction of the cylindrical member inside the cylindrical member,
The boiler burner according to claim 6, wherein the sound absorbing material is filled between the partition walls.

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