JPH07158815A - Catalyst combustion device - Google Patents

Abstract

PURPOSE:To make a gas combustion temperature uniform at a catalyst member and to enable gas catalyst combustion to be carried out with high efficiency by a method wherein a fuel gas injection nozzle is arranged at a proper position. CONSTITUTION:As fuel gas enters a manihold 20 through a feeding pipe 21, the fuel gas is entirely method by a gas supplying flow passage 19 due to the fact that the manihold 20, a gas supplying flow passage 19 and fuel gas injection nozzles (total number) 14 have fuel gas passing sectional areas arranged in this sequence in their sizes, resulting in that the gas is flowed in a substantially similar manner and finally the gas is injected substantially uniform through the nozzles 14. In addition, a gas supplying plate 15 is piled up from its front side on a catalyst 1, a ceramics wool 2' and a net spacer 3' and further piled up at their rear surfaces to hold their edges between the holding frame 13 and a heat-resistant packing 17, resulting in that a surface pressure applied to each of fuel gas injection nozzles 14 of the gas supplying plate 15 and then a uniform injection of the fuel gas is carried out. In addition, a backing plate 18 is arranged at a rear part of the flat gas supplying plate 15 so as to form the gas supplying passage 19 and the manihold 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic combustion device,
In particular, it relates to the fuel gas supply structure.

[0002]

2. Description of the Related Art Generally, a conventional catalytic combustion apparatus is constructed by laminating a catalyst body 1 for combustion reaction as shown in FIG. 7, a stone fiber 2 for preventing flashback and adiabatic action, and a porous plate or a mesh body 3. The nozzle tube 4 for fuel gas injection for supplying the fuel gas to the catalyst body 1 is disposed on the side of the porous body or the mesh body 3, and the heat sink 5
In many cases, the fuel gas main conduit 6 is connected to the nozzle tube 4 by covering the rear side thereof and penetrating the heat dissipation plate 5. Prior art documents include, for example, "Fuel Association Magazine" Vol. 58, No. 626 (1979). By the way, the fuel gas injection nozzle pipe 4 of this catalytic combustion apparatus is formed by bending two long pipes, which are divided into left and right, into a U-shape, and the nozzles 4 are arranged at regular intervals.
Since a is bored, the amount of fuel gas injected between the nozzle 4a near the fuel gas introduction port of the nozzle tube 4 and the nozzle 4a at the tip end of the nozzle pipe 4 is different, and the combustion in the catalytic body 1 is entirely over. It became non-uniform and the combustion temperature varied. For this reason, in the catalytic combustion apparatus, as shown in FIGS. 8 and 9, the fuel gas injection nozzle tube 8 having the nozzles 7 for supplying the fuel gas to the catalyst body 1 formed at regular intervals is fixed in the left-right direction. Multiple horizontal manifolds 9 with a space between them
The fuel gas supply header 11 is constructed by providing a gas introduction pipe 10 connected to the fuel gas supply pipe on one end face of the manifold 9 so as to communicate with the upper surface of the manifold 9, and the fuel gas supply header 11 is shown in FIG. As described above, the catalyst body 1, the ceramic wool 2 ', and the mesh spacer 3'are laminated and laminated behind the laminated body held in the outer frame 12 to form the catalyst body 1
We are trying to make the combustion in the entire area uniform. However, the fuel gas supply header 11 varies in the amount of fuel gas supplied to each nozzle pipe 8 due to variation in the shape of the connecting portion that occurs when the nozzle pipe 8 and the manifold 9 are connected during manufacturing. It is necessary to connect many with high accuracy,
In reality, a sufficient number of nozzle tubes 8 are not connected due to the labor and cost. Therefore, in the flameless combustion in which the number of nozzles 7 is small, the combustion on the catalyst body 1 is not uniform over the entire surface, and the combustion temperature is within the ignition temperature of the fuel gas,
In particular, it is necessary to control the maximum temperature part of the catalyst body 1 within the ignition temperature. Therefore, if there is a large variation in the combustion temperature, the maximum heat quantity that can be supplied decreases, resulting in a decrease in catalyst combustion efficiency.

[0003]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a fuel gas injection nozzle is provided at an appropriate position to make the gas combustion temperature in the catalyst uniform, thereby enabling highly efficient gas catalytic combustion. It is an object of the present invention to provide an inexpensive catalytic combustion device by eliminating the connection between the nozzle pipe and the manifold and simplifying the structure and facilitating the manufacture.

[0004]

A catalytic combustion apparatus of the present invention for solving the above-mentioned problems includes a catalyst body for causing a combustion reaction from the front side, ceramic wool for preventing flashback and heat insulation, and a mesh spacer. Laminated, gas supply plates on the back side of which a large number of fuel gas injection nozzles for supplying fuel gas to the catalyst are arranged are laminated so as to be capable of thermal expansion in the circumferential direction, and these are held in a frame, A backing plate is arranged behind the gas supply plate to form a vertical flat space gas supply flow path, and a rectangular cylindrical manifold is formed at the lower end of the gas supply flow path and is held and fixed in the frame. A gas introduction pipe connected to the fuel gas supply pipe is provided.

[0005]

In the catalytic combustion apparatus of the present invention constructed as described above, a flat gas supply plate having a large number of fuel gas injection nozzles is used to supply the fuel gas to the catalyst body. Efficient catalytic combustion of any fuel gas by changing the diameter, number, position, etc. of the fuel gas injection nozzles according to the type, properties, supply amount, and specifications of the fuel gas. You can Also, this gas supply plate, from the front side, the catalyst body, ceramics wool,
Since they are held in the frame by being laminated so that they can be thermally expanded in the circumferential direction on the back side where they are laminated with the net-like spacers,
A uniform surface pressure is applied to each fuel gas injection nozzle to enable uniform injection of fuel gas, and a backing plate is placed behind the gas supply plate to form a vertical flat space gas supply flow path. In addition, since a rectangular tubular manifold is formed at the lower end of the manifold, the cross-sectional area of passage of fuel gas is
The relationship of gas supply flow path> fuel injection nozzles (total number) is satisfied, and the fuel gas that has entered the manifold is narrowed down throughout the gas supply flow path and flows almost uniformly, and finally the fuel gas with the highest pressure loss. Fuel gas is injected from the injection nozzle substantially uniformly. Therefore, the combustion temperature in the catalytic body is made uniform, and highly efficient gas catalytic combustion becomes possible. Further, the catalytic combustion apparatus of the present invention has a gas supply flow in a vertical flat space by arranging a backing plate behind a flat gas supply plate without connecting a nozzle pipe and a manifold as in the conventional case. Since the passage and the manifold in the shape of a square cylinder are formed,
Manufacturing of the fuel gas supply header is simplified to save labor and cost.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the catalytic combustion apparatus of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 is a catalyst body for front side combustion reaction, and 2'is arranged on the back surface of the catalyst body 1. Further, ceramic wool 3'for preventing flashback and heat insulation is a mesh spacer arranged on the back surface of the ceramic wool 2 ', which are stacked and held in the holding frame 13. A gas supply plate 15 having a plurality of fuel gas injection nozzles 14 for supplying a fuel gas to the catalyst body 1 in a zigzag arrangement is laminated on the back side of the mesh spacer 3 ', and the peripheral edge thereof is the holding frame 13'. It is sandwiched between the heat-resistant packing 17 and the heat-resistant packing 17 held by the packing retainer 16 so that it can be thermally expanded. Then, the backing plate 18 is arranged behind the gas supply plate 15 to form a gas supply flow path 19 having a vertical flat space, and
A rectangular tubular manifold 20 is formed at the lower end thereof,
It is fitted on the packing retainer 16. The manifold 20 is provided with a fuel gas introduction pipe 21 connected to a fuel gas supply pipe (not shown). The periphery of the backing plate 18, the rear part of the packing presser 16, the rear part of the inner frame 22 fitted to the outer periphery of the packing presser 16, and the rear outer frame 23 fitted to the rear part of the inner frame 22 are welded and integrated. A holding frame 13 in which the catalyst body 1, the ceramic wool 2 ', and the mesh spacer 3'are stacked and held is fitted inside the front portion of the inner frame 22, and the peripheral edge of the catalyst body 1 is pressed against the front outer surface of the inner frame 22. Front outer frame 2
4 is mounted and fastened to the rear outer frame 23 with bolts and nuts 25.

In the catalytic combustion apparatus of the embodiment thus constructed, when the fuel gas supplied through the fuel gas supply pipe (not shown) enters the manifold 20 through the introduction pipe 21,
As a result, the cross-sectional area of passage of the above fuel gas is reduced to the manifold 2
0> Gas supply flow path 19> Fuel gas injection nozzles (total number)
Since the relationship is 14, the fuel gas is narrowed down in the entire gas supply flow path 19 and flows substantially uniformly, and finally is injected substantially uniformly from the fuel gas injection nozzle 14 having the highest pressure loss. Further, the gas supply plate 15 is laminated from the front side to the catalyst body 1, the ceramic wool 2 ', and the back side thereof laminated with the mesh spacer 3', and the peripheral edge is sandwiched between the holding frame 13 and the heat-resistant packing 17. Since it is held, the surface pressure applied to each fuel gas injection nozzle 14 of the gas supply plate 15 becomes uniform, and uniform injection of fuel gas is performed. Therefore, the fuel gas uniformly permeates through the entire surface of the mesh spacer 3'and the ceramic wool 2 ', reaches the catalyst body 1 and burns uniformly over the entire surface, the combustion temperature becomes uniform, and highly efficient gas catalytic combustion is performed. Be seen. Further, in this gas-catalyzed combustion, even if the gas supply plate 15 thermally expands, it does not fluff like a drum, and since the peripheral edge is sandwiched between the holding frame 13 and the heat-resistant packing 17, it becomes free. Thermal expansion in the circumferential direction prevents surface pressure from being applied to the mesh spacer 3 ', the ceramic wool 2'and the catalyst 1. Further, in the catalytic combustion apparatus of the embodiment, by arranging the backing plate 18 behind the flat gas supply plate 15, the gas supply flow path 19 in the vertical flat space and the manifold 20 in the shape of a rectangular cylinder are formed. ,
Manufacturing of the fuel gas supply header is simplified to save labor and cost. In the catalytic combustion apparatus of the above embodiment, the periphery of the gas supply plate 15 is sandwiched between the holding frame 13 and the heat-resistant packing 17 so that the surroundings are free to absorb the thermal expansion during gas catalytic combustion. However, the present invention is not limited to this, and a corrugated heat-resistant diaphragm may be attached to the upper, lower, left, and right sides of the gas supply plate 15, and the heat-resistant diaphragm may be connected and held to the inner frame 22. By doing so, the gas supply plate 1 at the time of gas catalytic combustion
The thermal expansion of No. 5 can be absorbed by the heat resistant diaphragm.

Further, in the catalytic combustion apparatus of the above-mentioned embodiment, the fuel gas injection nozzles 14 of the gas supply plate 15 are arranged in a zigzag arrangement, but the pressure loss gradient is due to the specific gravity and physical properties of the fuel gas. Therefore, it is desirable to change the diameter, number, and position of the fuel gas injection nozzles 14 according to this pressure loss gradient. For example, for fuel gas having a low specific gravity, as shown in FIG. It is desirable to increase the pitch of the nozzles 14 as it goes upward, or to gradually reduce the diameter of the nozzles 14 as shown in FIG. 4. For fuel gas having a large specific gravity, as shown in FIG. It is desirable to decrease the pitch of the nozzles 14 from the bottom to the top, or to gradually increase the diameter of the nozzles 14 as shown in FIG. However, the pressure loss gradient due to the physical properties of the fuel gas also has an effect, so it is advisable to consider this when designing. Thus, the gas supply plate 13
In accordance with the type, properties, supply amount, and specifications of the fuel gas,
By properly selecting the diameter, number, position, etc. of the nozzles 14, it is possible to efficiently carry out gas catalytic combustion with any fuel gas. Further, the fuel gas injection nozzle 14 of the gas supply plate 15 shown in FIG. 1 may be appropriately burned without replacing the gas supply plate 15 of FIGS. It may be closed with a heat-resistant putty before use.

[0009]

As described above, according to the catalytic combustion apparatus of the present invention, the fuel gas can be injected substantially uniformly from the nozzles provided in the gas supply plate in a large number of arrangements, and the gas supply plate is the catalyst body, the ceramic wool, Since the periphery of the mesh spacer is laminated on the back side of the mesh spacer and is held freely, the surface pressure applied to each nozzle becomes uniform, and the fuel gas is further uniformly injected. Therefore, gas catalytic combustion is performed on the entire surface of the catalyst body, the combustion temperature is made uniform, and highly efficient gas catalytic combustion is performed. Moreover, in this gas catalytic combustion, the gas supply plate thermally expands in the circumferential direction, so that it does not fluff like a drum and no surface pressure is applied to the catalyst body side. Also, by using a gas supply plate with the nozzle diameter, number, position, etc., selected appropriately according to the type, properties, supply amount, and specifications of the fuel gas, catalytic combustion can be performed efficiently with any fuel gas. It can be carried out. Further, in the catalytic combustion device of the present invention, by arranging the backing plate behind the flat gas supply plate, the gas supply flow path of the vertical flat space and the manifold of the rectangular cylinder are formed, so that the fuel gas supply The manufacturing of the header is simplified to save labor and cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a catalytic combustion apparatus of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a diagram showing another example of a gas supply plate in the catalytic combustion apparatus of the present invention.

FIG. 4 is a diagram showing another example of the gas supply plate.

FIG. 5 is a view showing another example of the gas supply plate.

FIG. 6 is a view showing another example of the gas supply plate.

FIG. 7 is an exploded perspective view showing a conventional catalytic combustion device.

FIG. 8 is a front view showing a fuel supply header in another conventional catalytic combustion device.

9 is a side view of FIG.

10 is a vertical cross-sectional view of another conventional catalytic combustion device including the fuel supply header of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 catalyst body 2'ceramics wool 3'mesh spacer 13 holding frame 14 fuel gas injection nozzle 15 gas supply plate 18 backing plate 19 gas supply flow path 20 manifold 21 fuel gas introduction pipe 22 inner frame 23 rear outer frame 24 front part Outer frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuto Senoo 2-5-13 Sanno, Ota-ku, Tokyo Within Benkan Co., Ltd. (72) Inventor Akira Kosuge 2-5-13 Sanno, Ota-ku, Tokyo Stocks Within Benkan (72) Inventor Kazuo Ohashi 2-5-13 Sanno, Ota-ku, Tokyo Benkan Stock Company (72) Inventor Manabu Ito 2-5-13 Sanno, Ota-ku Tokyo (72) Inventor Fumiaki Aono 2-5-13 Sanno, Ota-ku, Tokyo Within Benkan Co., Ltd.

Claims (1)

[Claims] 1. A fuel gas injection for supplying a fuel gas to the catalyst body on the back side of which a catalyst body for combustion reaction from the front side, ceramic wool for preventing flashback and heat insulation, and a mesh spacer are laminated. Gas supply plates with a large number of nozzles arranged for thermal expansion are laminated in the circumferential direction so that they can be held in the frame, and a backing plate is placed behind the gas supply plates to create a gas in a vertical flat space. A catalytic combustion apparatus in which a supply flow path is formed, a rectangular tubular manifold is formed at a lower end portion thereof, is held and fixed in the frame, and the manifold is provided with a gas introduction pipe connected to a fuel gas supply pipe. .