JP2572398Y2 - Fluidized bed furnace - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fluidized bed furnace having a gas dispersion plate and a fluidized bed in each of a plurality of stages. The present invention relates to a fluidized bed furnace equipped with a gas dispersion plate suitable for burning a gas containing a combustible substance in an upper fluidized bed.

[0002]

2. Description of the Related Art In order to burn combustible substances in a fluidized bed, it is necessary to supply air from below the fluidized bed. In this case, since the fluidized bed temperature is generally as high as 700 to 900 ° C., the air supply pipe has to be made of a material excellent in high-temperature corrosion resistance, for example, an expensive material such as stainless steel or heat-resistant steel. . For this purpose, for example, Japanese Utility Model 3-249
As described in Japanese Patent Publication No. 70, a plurality of gas dispersion plates are provided vertically, so that a plurality of fluidized beds are formed separately, and a secondary air pipe is attached to the upper gas dispersion plate. A fluidized-bed boiler has been proposed which is provided side by side with a water-cooled tube (heat transfer tube) so that a secondary air pipe can be cooled by the water-cooled tube and can be made of a material having low high-temperature corrosion resistance.

As shown in FIG. 6, an upper gas dispersion plate in a fluidized-bed boiler described in Japanese Utility Model Publication No. 3-24970 discloses a large number of water cooling tubes (heat transfer tubes) 10 and these water cooling tubes 10 are hermetically sealed. An air pipe 14 is provided so as to be in contact with a lower part of the water cooling pipe 10. Reference numeral 16 denotes a gas nozzle provided on the plate member.

[0004]

[Problems to be Solved by the Invention] In the structure shown in FIG.
Since the air pipe 14 and the water cooling pipe 10 are only in line contact only at the portion A and have a small heat transfer area, there is a problem that the cooling effect of the air pipe 14 in the water cooling pipe 10 can hardly be exhibited. The present invention has been made in view of the above points, and an object of the present invention is to provide an air supply pipe (air pipe), a water cooling pipe (heat transfer pipe) and
Water cooling tube with integrated structure with plate members arranged in the same plane
(Heat transfer tube) and air supply tube (air tube) via a plate-like member
By making surface contact, the heat transfer area can be increased and the cooling effect of the air supply tube by the water cooling tube (heat transfer tube) can be sufficiently exhibited, and the air supply tube can be made of an inexpensive material with low corrosion resistance. It is an object of the present invention to provide a fluidized-bed furnace having a gas dispersion plate having a compact and simple structure.

[0005]

In order to achieve the above object, the fluidized bed furnace of the present invention has a plurality of gas dispersion plates, on each of which a fluidized bed is formed. in a fluidized bed furnace, the gas distribution plate of the upper fluidized bed, the heat transfer tube and air tube the tubes with the plate-like member to be connected hermetically,
The center axis of the air tube, the center axis of the heat transfer tube, and the plate
To be arranged on the surface, and to the axial direction of the air pipe .
Sides are in contact with the axial side surface of the heat transfer tube through the plate-shaped member.
The air pipe and the heat transfer pipe are regularly arranged so as to touch, a gas nozzle through which gas from below passes is provided integrally with this plate-shaped member, and an air nozzle for jetting air into the air pipe is provided. (See Figs. 1, 3, 4, and 5)
See) . The air nozzle may blow air toward the upper fluidized bed (see FIG. 3) , or blow air toward the lower freeboard (see FIG. 4) , or the upper fluidized bed and the lower freeboard. The air pipe is provided so as to blow air toward the air pipe (see FIG. 5) .

As described above, a heat transfer tube (water cooling tube) and an air tube
(Air supply pipe) and a plate-like member such as a steel plate are placed on the same plane.
And by an integral structure by welding the air pipe and the heat transfer tubes (cooling water pipe) and (air supply pipe) through the <br/> plate-like member, on both sides of the air tubes through the plate-like member Den The heat pipe comes into surface contact with a large area in the axial direction of the pipe, and the air pipe is sufficiently cooled by the heat transfer pipe. Further, by forming the gas distribution plate by integrally forming the air pipe (air supply pipe), the heat transfer pipe (water cooling pipe), and the gas nozzle, the configuration is simplified, and the economic effect is large. The ratio of the number of air pipes and the number of gas nozzles provided with air nozzles can be changed as necessary. For example, the number of gas nozzles can be set to two for the number of air pipes, or the number of gas nozzles can be set to one for two air pipes. Both sides of the air pipe (air supply pipe) are plate-shaped
Heat transfer tube (water-cooled tube) and a large area in the axial direction of the tube through the member
In order to increase the cooling effect by making the surfaces contact with each other, FIG.
-As shown in Fig. 5, the air pipe is every two heat transfer pipes (water cooling pipes)
Or regularly arranged in the air pipe
Are arranged regularly and alternately with heat transfer tubes (water cooling tubes),
Air tubes are regularly arranged every three heat transfer tubes (water cooling tubes)
It can be a configuration or the like.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. However, the materials, shapes, relative arrangements, and the like of the constituent members described in this embodiment are not intended to limit the scope of the present invention only to them, unless otherwise specified. This is just an example. FIG. 1 shows an embodiment of the fluidized bed furnace of the present invention, and FIG.
FIG. 3 shows the periphery of the upper gas dispersion plate in FIG.
2 shows an enlarged cross section of the gas distribution plate in FIGS. 1 and 2.

Reference numeral 20 denotes a fluidized bed furnace according to the present invention, which has a lower gas dispersion plate 22 and an upper gas dispersion plate 24, on which a lower fluidized bed 26 and an upper fluidized bed 28 are formed, respectively. Is done. Reference numeral 30 denotes a wind box, and 32 denotes a primary air supply pipe connected to the wind box 30. A secondary air supply pipe 34 is connected to the air pipe 36 of the upper gas dispersion plate 24. 38 is a lower free board, 40 is an upper free board, and 42 is a secondary air inlet pipe.

[0009] In the upper gas distribution plate 24, as shown in FIGS. 2 and 3, the heat transfer tube (the cooling water pipe) 10 and an air pipe 36 and the plate-like member 12 such as a steel plate that connects the tubes hermetically air tube
The central axis of the heat transfer tube (water cooling tube) 10 as viewed from the cross section of 36 is
The same plane in the plate member 12 as the central axis viewed from the cross section
It is configured integrally so as to be placed on top . In addition, FIG.
As shown in FIG. 3 and FIG. 3, the air pipe 36 is a heat transfer pipe (water cooling pipe) 1.
0 are regularly arranged every two lines, and both sides of the air pipe 36 are
Heat transfer tube (water-cooled tube) 10 and the axial direction of the tube
It is configured to increase the cooling effect by making surface contact with a large area
Have been. In addition, the air tube alternates with the heat transfer tube (water cooling tube).
Regularly arranged structure and air tube is heat transfer tube (water cooling tube)
Of course, it is also possible to adopt a configuration that is arranged regularly every three
It is possible. The plate member 12 is provided with a gas nozzle 16 through which gas from below passes upward,
Is provided with an air nozzle 44 for ejecting air toward the upper fluidized bed 28. 46 is an air header and 48 is a heat transfer tube header.

FIG. 3 shows an air nozzle 4 for ejecting secondary air.
4 is provided above the air pipe 36, but as shown in FIG.
The air pipe 36 is provided with a downward air nozzle 50 so as to blow out toward the air pipe 8, or as shown in FIG.
6 has an upward air nozzle 44 and a downward air nozzle 5
In some cases, 0 may be provided. Although not shown, one air pipe may be provided with an upward air nozzle and a downward air nozzle. The heat of the air pipe 36 is transmitted to the heat transfer pipe (water cooling pipe) 10 via the plate members 12 on both sides, and the air pipe 36 is efficiently cooled.

[0011]

[Effects of the Invention] The present invention is configured as described above, and has the following effects. (1) Air pipe, heat transfer pipe (water-cooled pipe), and plate-shaped member are the same
The air tube and the heat transfer tube (water-cooled tube) are integrated so that the air tube and the heat transfer tube (water-cooled tube) are in planar contact with the heat transfer tube (water-cooled tube) through a plate-shaped member. ) And rules
Since the heat transfer area is increased and the air transfer pipe is sufficiently cooled by the heat transfer pipe (water cooling pipe), it is not necessary to use expensive materials such as stainless steel and heat-resistant steel. (2) Arrange the air tube on the same plane as the water cooling tube (heat transfer tube).
The gas dispersion plate is
Configuration. ( 3 ) Since the air pipe, the heat transfer pipe (water cooling pipe), and the gas nozzle can be integrally formed to form a gas dispersion plate,
The structure is simple and the economic effect is great.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a fluidized bed furnace of the present invention.

FIG. 2 is a perspective view showing the periphery of an upper gas dispersion plate in FIG.

FIG. 3 is an enlarged cross-sectional view of an upper gas dispersion plate in FIG.

FIG. 4 is a cross-sectional view showing another example of the upper gas dispersion plate in the present invention.

FIG. 5 is a cross-sectional view illustrating still another example of the upper gas dispersion plate according to the present invention.

FIG. 6 is a sectional view showing an example of a conventional upper gas dispersion plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heat transfer tube (water-cooled tube) 12 Plate-shaped members, such as a steel plate, 14 Air tube 16 Gas nozzle 20 Fluidized bed furnace 22 Lower gas dispersion plate 24 Upper gas dispersion plate 26 Lower fluidized bed 28 Upper fluidized bed 36 Air tube 38 Lower free board 44 Upward Air nozzle 50 Downward air nozzle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23G 5/027 F23G 5/30 F23C 11/02

Claims (4)

(57) [Scope of request for utility model registration] In a fluidized-bed furnace having a plurality of gas dispersion plates and a fluidized bed formed on each of the gas dispersion plates, the gas dispersion plates of the upper fluidized bed are formed by heat transfer tubes, air tubes, and these tubes. in the plate-shaped member for connecting airtightly the central axis of the air tube, Den
The central axis of the heat tube and the plate-like member are arranged on the same plane.
Uni integrally constructed, the air pipe so that the axis direction of both sides of the air tube is in contact axial sides and surface of the heat transfer tubes through the plate-like member
And a heat transfer tube are regularly arranged , a gas nozzle through which gas from below is integrally provided in the plate-shaped member, and an air nozzle for jetting air to the air tube is provided. . 2. The fluidized bed furnace according to claim 1, wherein an air nozzle for jetting air toward the upper fluidized bed is provided in the air pipe. 3. The fluidized bed furnace according to claim 1, wherein an air nozzle for jetting air toward the lower free board is provided in the air pipe. 4. The fluidized bed furnace according to claim 1, wherein the air pipe is provided with an air nozzle for blowing air toward the upper fluidized bed and the lower freeboard.