JP3094354B2 - Fiber mat burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface burning type fiber mat burner for burning fuel gas on the surface of a fiber mat. In particular, the present invention relates to a fiber mat burner capable of uniformly diffusing and supplying a fuel gas to each part of a long burner plate.

[0002]

2. Description of the Related Art The present inventors have previously described Japanese Patent Application Laid-Open No. 2-279.
No. 908, a surface burning type burner having a fiber sintered burner plate was developed. This conventional burner will be described with reference to the accompanying drawings.

FIG. 5 is a front view of a burner, and FIG. 6 is a side view. In the figure, reference numeral 110 denotes a burner main body on which a burner plate 101 is mounted, and 112 denotes a fuel gas supply device, which supplies a fuel gas from a gas cylinder 113 to a nozzle 114 provided in the burner main body 101. I have. Propane gas is used as fuel gas. Reference numeral 116 denotes a blower for supplying air.
A premixed gas of fuel gas and air ejected from the nozzle 4 is formed. Reference numeral 120 denotes a spark plug, and 121 denotes a power supply for the spark plug 120 and the fuel gas solenoid valve 115.

[0004] In the burner configured as described above,
The premixed gas of the fuel gas and the air is jetted uniformly from the entire surface of the burner plate 101. Next, when the flame is ignited by the ignition plug 120, the flame propagates over the entire surface of the burner plate 101, starts burning in a state of being attached to the surface, and does not float from the surface. Thus, the surface of the burner plate 101 is uniformly red-heated, generating heat from the high-temperature gas and heat due to high radiation.

This conventional burner plate has a very high porosity, so that it is easy to increase the surface load, and high load combustion can be achieved. Further, the radiation efficiency and the heat efficiency are improved, and even if the burner plate has a large area, there is an effect that uniform combustion can be performed on the surface.

[0006]

The above-mentioned conventional burner, when having a burner plate having substantially the same vertical and horizontal dimensions as shown in FIG. 5, was excellent in uniform combustion properties at each surface portion. However, depending on the shape of the portion to be heated, a burner having a different longitudinal shape may be required for many vertical and horizontal dimensions. At this time, if the burner plate becomes long (for example, the ratio
As described above, it has been difficult for the fuel gas to uniformly spread to every corner of the burner, causing uneven combustion. For this reason, uniform burnability in each part of the burner plate has deteriorated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fiber mat burner which is excellent in diffusibility of fuel gas in a burner and, as a result, is excellent in uniform burning of each part of a long burner plate.

[0008]

In order to solve the above-mentioned problems, a fiber mat burner according to the present invention is connected to a long fiber mat burner plate and a fiber mat burner plate at a peripheral portion of the fiber mat burner plate. Also, the fuel on one side (back side) of the fiber mat
A casing forming a gas diffusion chamber, the Keshinku
Extends in the longitudinal direction of the fiber mat burner plate on the bottom surface
Along the tangent to the bottom
A fuel gas diffusion tube having a large number of fuel gas injection ports ,
The fuel gas diffusion tube comprising a fuel gas supply pipe for supplying the fuel gas, a fuel gas ports of the fuel gas diffusion tube, characterized in that facing the wall of the fuel gas diffusion chamber Things.

Also, a long fiber mat burner is provided.
Plate and the periphery of the fiber mat burner plate.
Fiber mat plate connected to bar mat burner plate
A fuel gas diffusion chamber is formed on one side (back side) of the
And the fiber mat inside the casing.
The fuel gun is disposed so as to extend in the longitudinal direction of the
The opening area density of the fuel gas outlet is
Lower fuel gas in the section than in the center of the pipe
And a fuel gas diffusion tube having a spout, the fuel gas diffusion tube
A fuel gas supply pipe for supplying fuel gas to the
The fuel gas outlet of the fuel gas diffusion tube is
It is characterized by facing the wall of the room.

Further, the fuel gas burner diffusion pipe and the fan
A perforated plate is further provided between the
It is what has been.

[0011]

The fiber mat burner plate is a burner plate made of a perforated plate obtained by sintering metal or ceramic fibers. The burner plate in the fuel gas flows to the front side from the back side (the fuel gas <br/> diffusion chamber in the casing), combustion in the burner plate surface
Gas burns. The fuel gas diffusion chamber, the fuel gas diffusion pipes are provided so as to extend in the longitudinal direction of the fiber mat burner plate. Since the fuel gas injection port fuel gas is opened in the diffusion tube is facing the wall of the fuel gas diffusion chamber, the fuel gas ejected from the ejection port is spread against the wall of a time diffusion chamber.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional side view of a fiber mat burner according to one embodiment of the present invention. FIG. 2 shows FIG.
It is a partial cross-sectional plan view of the fiber mat burner. FIG. 3 is a sectional view showing a III-III section of FIG.

The fiber mat burner of this embodiment comprises a fiber mat 1, a perforated plate 2, a fuel gas diffusion tube 3, a fuel gas
It comprises a gas supply pipe 4, a casing 5, and the like. The fiber mat 1 is mounted on the upper surface of the flange portion 53 at the upper end of the casing 5 by being pressed by the holding flange 51. The fiber mat 1 has an elongated rectangular shape, and is formed by sintering long fibers (average diameter 25 μm, average length 50 mm) of stainless steel (SUS316). The porosity of fiber mat 1 is about 85%
It is.

The casing 5 has a long and narrow shape and is made of a stainless steel welded structure. The inside of the casing 5 is a space called a fuel gas diffusion chamber 59. The diffusion chamber 59 is connected to the end wall plate 5 of the casing 5.
4, a bottom plate 55 and a side wall plate 56 (FIG. 3).

On the bottom plate 55 of the casing 5, a fuel gas diffusion tube 3 extending in the longitudinal direction is provided. This fuel
As shown in FIG. 3, the gas diffusion tube 3 is shaped like a half-rounded round pipe that is folded down. A fuel gas supply pipe 4 is connected to a central portion in the longitudinal direction of the diffusion pipe 3 through the casing bottom plate 55 from below.

On the side wall of the fuel gas diffusion tube 3, a large number of fuel gas pipes extend along the tangent to the casing bottom plate 55.
The nozzle 31 is provided. As shown in FIG. 1, the outlets 31 have the same diameter, but the opening pitch is close at the center in the longitudinal direction and rough at both ends. When gas is introduced into a tube from one direction and this gas is blown out from a hole in the tube wall, generally, the end of the tube (end plate 3) is formed.
It has been experimentally and theoretically confirmed that the gas ejection amount is larger in the (closer to 3) gas. As described above, by making the opening area density of the ejection port lower in the peripheral portion of the diffusion tube than in the central portion, the ejection amount of the fuel gas in the longitudinal direction of the diffusion tube can be adjusted to be uniform. Of course, the diameter of the ejection port 31 at the center may be increased and both ends may be decreased.

As shown in FIG. 3, the jet port 31 of the fuel gas diffusion tube 3 is provided so as to face the side wall plate 56 of the casing 5. Therefore, the fuel gas ejected from the ejection port 31 flows toward the side wall plate 56 and hits the same plate 56. The collision with the side wall panels 56 of such a fuel gas, the fuel gas is uniformly diffused in the diffusion chamber 59.
Of course, it may not be necessary to go until the fuel gas directly hits the side wall plate 56 in some cases.

At the center of the fuel gas diffusion chamber 59, a perforated plate 2 is attached so as to spread in parallel with the fiber mat 1. Specifically, the perforated plate 2 is attached to a rib 57 erected on a casing side wall plate 56 with screws or the like. The perforated plate 2 is made of stainless steel punch metal or the like. The perforated plate 2 is provided from the diffusion tube 3 to the diffusion chamber 59.
This helps to further uniformly diffuse the fuel gas supplied to the fuel cell . In the case of a burner having a large turndown ratio (a value obtained by dividing the maximum flow rate of the fuel gas by the minimum flow rate), or a case where the length scale of the burner plate is remarkable, the perforated plate 2 should be provided for the following reasons. . In other words, the perforated plate 2 allows the fiber mat burner 1 to be more evenly extended to every corner of the back surface.
The fuel gas can be supplied, and the inherent characteristics of the burner using the fiber mat of uniform combustion can be sufficiently exhibited regardless of the burner output.

Since the fiber mat burner can have a large turndown ratio, the change in the amount of injected fuel gas is large. After the upper and lower limits of the burner output are determined, the fuel
Optimally determine the diameter and pitch of the injection port of the source gas diffusion tube. Further, if necessary, the employment of a perforated plate, its hole diameter, pitch and the like can be appropriately selected.

FIG. 4 is a sectional view of a fiber mat burner according to another embodiment of the present invention (corresponding to FIG. 3). The fiber mat burner, rectangular section pipes made of retardant
Source gas diffusion tube 31 '. A fuel gas injection port 33 ′ is opened on the side wall of the diffusion tube 31 ′, also facing the casing side wall plate 56. The fuel gas diffusion tube can have various shapes as described above.

[0021]

As is apparent from the above description, the fiber mat burner of the present invention is excellent in the diffusion of fuel gas in the burner, and as a result, each part of the long burner plate is excellent in uniform combustion.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a fiber mat burner according to one embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of the fiber mat burner of FIG.

FIG. 3 is a sectional view showing a III-III section of FIG. 1;

FIG. 4 is a sectional view of a fiber mat burner according to another embodiment of the present invention. (FIG. 3 equivalent part).

FIG. 5 is a front view of a burner disclosed in Japanese Patent Application Laid-Open No. 2-279908.

FIG. 6 is a side view of the burner of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fiber mat 2 Perforated plate 3 Fuel gas diffusion pipe 4 Fuel gas supply pipe 5 Casing 31 Fuel gas ejection port 33 End plate 51 Holding flange 53 Flange part 54 End wall plate 55 Bottom plate 56 Side wall plate 57 Rib 59 Fuel gas diffusion chamber

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Tamotsu Hayase 3rd Bentencho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Within NKK Total Design Co., Ltd. (72) Inventor Hideyo Tatsuta 3rd Bentencho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor: Koho Taoka, 3rd Bentencho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture NKK Total Design Inc. (56) References JP-A-60-42504 (JP, A) JP-A-62- 114650 (JP, A) Fully open 1986-192128 (JP, U) Fully open 1986-4137 (JP, U) Fully open, 52-131632 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) F23D 14/16

Claims (3)

(57) [Claims] 1. A fiber mat burner plate having a long shape, and a fuel gas diffusion chamber provided on one side (back side) of the fiber mat plate connected to the fiber mat burner plate at a peripheral portion of the fiber mat burner plate. And a fiber mat burner plate on the bottom of the casing.
Longitudinally with it is arranged to extend in the bottom surface of the
With multiple fuel gas injection ports along the tangent to
A material gas diffusion tube, anda fuel gas supply pipe for supplying a fuel gas to the fuel gas diffusion pipes, the fuel gas ports of the fuel gas diffusion pipes, the wall of the fuel gas <br/> diffusion chamber Fiber burner characterized by facing. 2. An elongated fiber mat burner plate, and a fuel gas diffusion chamber on one side (back surface) of the fiber mat plate connected to the fiber mat burner plate at a peripheral portion of the fiber mat burner plate. And a casing formed in the casing so as to extend in a longitudinal direction of the fiber mat burner plate, and an opening area density of the fuel gas outlet is set at a peripheral portion of the fuel gas diffusion pipe.
Anda fuel gas supply pipe for supplying the fuel gas and the fuel gas diffusion pipes, to the fuel gas diffusion tube having a low fuel gas ports than in the central portion of the tube, the fuel gas of the fuel gas diffusion tube A fiber mat burner, wherein an ejection port faces a wall of the fuel gas diffusion chamber. Wherein the between the fuel gas burner diffusion tube and the fiber mat burner plate, fiber mat burner according to claim 1 or 2, wherein a perforated plate is further disposed.