JPH0412325Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a boiler formed of a water tube wall, and when a burner device having an annular air nozzle around a fuel injection nozzle is installed in the boiler, the water in the burner section is Regarding improvement of pipe wall structure.

First, the conventional burner water tube wall structure in this type of boiler will be explained.

FIG. 1 is a perspective view of the conventional structure of a burner device installation part in a boiler, viewed from the combustion chamber side.
FIG. 2 is a cross-sectional view taken along the - line in FIG. 1. In these figures, A indicates a boiler and B indicates a burner device.

Boiler A has a pipe 15 in which boiler water flows.
(15a to 15l...) by directly joining a large number of them, or
Alternatively, spacer plates 16 (16a to 16l) are installed between the tubes 15.
It is composed of water pipe walls that are formed by joining each other via...). An insertion path C for arranging the burner device B is formed in this water pipe wall.

The burner device B is composed of an air duct 1, an air nozzle 2 connected to the air duct 1, a burner cylinder 3 disposed in the center of the air nozzle 2, a fuel oil pipe 5 inserted through the burner cylinder 3, etc. has been done. 6 is a fuel injection nozzle provided at the tip of the fuel oil pipe 5, and an air nozzle 2 is arranged around this nozzle.
are arranged in a ring. Further, 7 is a flame holder.

The water tube walls of boiler A are fluid-tightly fixed to each other with spacers 16a to 16l interposed between the tubes 15a to 15l, respectively, and are surrounded by the combustion chamber 18. is formed. Note that some of the pipes 15a to 15g forming the water pipe wall and the spacer plate 16
In the case of the insertion path C of the burner device B, a to 16g are bent so as to form the insertion path C and to form a wall surface surrounding the air nozzle 2 of the burner device B.

Note that the air nozzle 2 is attached to the air duct 1 via a pin 4, and there is a gap 1 in this attachment part.
7, a part of the combustion air passes through this gap 17 and flows to the outside of the air nozzle 2, that is, through the insertion path C to the combustion chamber 18 side. Further, the tip of the air duct 1 is fixed to a plate 13 with a fixing fitting 12 with a seal plate 14 in between, and the plate 13 is fixed to a pipe 15a. An air chamber 8 is formed around the joint between the air duct 1 and the air nozzle 2 by a cover 9. Furthermore, the outside of the water pipe wall formed by the pipes 15 and the spacer plates 16, including the cover 9 of these air chambers 8, is surrounded by a heat insulating material 10, and the outside thereof is covered with an outer plate 11. There is.

Next, the effect will be explained.

As indicated by the arrow in FIG. 2, combustion air is supplied through the air duct 1 from the left side of the figure;
This air flows out to the combustion chamber 18 side through the air nozzle 2 and the burner cylinder 3 located therein. on the other hand,
Fuel oil is supplied through the fuel oil pipe 5, sprayed into the combustion chamber 18 through the fuel spray nozzle 6, mixed with combustion air, and combusted. Boiler water flowing inside the tube 15 is heated by the flame in the combustion chamber 18.

By the way, a gap 17 is formed at the joint between the air duct 1 and the air nozzle 2.
A portion of the combustion air flows from the combustion chamber 18 to the combustion chamber 18. Since the air flowing here flows along the wall surface of the water tube wall of the insertion path C formed by the tubes 15a to 15g and the spacer plates 16a to 16g, it is combusted with the boiler water flowing inside the tubes 15a to 15g. Since the temperature of the combustion air is lower than the temperature of the boiler water flowing through the pipes 15a to 15g, heat exchange is performed between the combustion air and the combustion air.
The boiler water flowing within a~15g will be cooled by the combustion air.

Therefore, the boiler water flowing through the tubes 15a to 15g located in the insertion path C of the burner device B and the boiler water flowing through the other tubes 15h to 15l... have a disadvantage that the water temperature at the outlet of each tube is different. It was hot.

The present invention has been made for the purpose of eliminating such conventional drawbacks and providing a water tube wall structure of a burner section of a boiler that can balance the outlet temperature of boiler water.

In order to achieve this objective, the present invention provides a heat insulating material for the root side of the burner device on the wall surface of the water pipe wall, which is the burner device insertion path facing the outer surface of the air nozzle of the burner device. Each side portion is coated with a fireproof material to prevent the water pipe in this portion from being cooled by the combustion air passing around the outer periphery of the air nozzle, thereby alleviating the imbalance in the outlet temperature of the boiler water. At the same time, the fireproofing material is used to prevent the part near the combustion chamber from coming into contact with flames and burning out.

An embodiment of the present invention will be described in detail below with reference to FIG. 3. In FIG. 3, the same parts as in FIG. .

FIG. 3 shows an embodiment of the burner section water tube wall structure of a boiler according to the present invention, and is a cross-sectional view of a portion corresponding to FIG. 2 shown as a conventional example.

According to this embodiment, among the water pipe walls forming the burner device insertion path C with respect to the outer surface of the air nozzle 2 of the burner device B, the pipes 15a to 15d and the spacer plates 16a to
The surface of the water tube wall consisting of 16c is covered with a heat insulating material 19. Then, the surface of the insulation material is covered with a cover plate 20.
The cover plate 20 has one end fixed to the plate 13 and the other end fixed to the spacer plate 16d. This cover plate 2
The spacer plate 16d to which the air nozzle 2 is fixed is located at the rear of the tip of the air nozzle 2 on the combustion chamber 18 side, that is, on the side far from the combustion chamber 18, and the pipe 15a is located on the side further away from the combustion chamber 18.

On the other hand, the remaining tubes 15e to 15g forming the insertion path C of the burner device B, a part of the tube 15h, a part of the spacer plate 16d, and the spacer plates 16e to 16g are covered with the refractory material 21. There is. This refractory material 21 is supported by a plurality of refractory material support rods 22e to 22h fixed to the pipes 15e to 15h.

Note that although no code is given in Fig. 3, the tube 15
A heat insulating material 19 and a refractory material 21 are similarly provided in the opposing portions of the pipes a to 15h.

The present invention has the above-described configuration, and the combustion air flowing out from the gap 17 at the joint between the air duct 1 and the air nozzle 2 flows toward the combustion chamber 18 along the surfaces of the cover plate 20 and the refractory material 21. It turns out. Therefore, although the cover plate 20 is exposed to the combustion air and is cooled, since the heat insulating material 19 is interposed between the cover plate 20 and the pipes 15a to 15d, the cover plate 20 is exposed to the combustion air. The transfer of heat becomes extremely small. Therefore, tube 15
The temperature drop of the boiler water flowing in a to 15d is also reduced.

Further, although the refractory material 21 receives radiant heat from the flame in the combustion chamber 18 and its temperature rises, it is not damaged because of its excellent heat resistance. The surface of the refractory material 21 that receives heat from the flame becomes high temperature;
Since the inside of the refractory material 21 has thermal resistance, the temperature decreases as it moves away from the surface, so the surface of the cover plate 20 that is in contact with the refractory material 21 does not reach a high temperature, so there is no risk of the cover plate 20 burning out.

Needless to say, the tubes 15e to 15g covered with the refractory material 21 are also free from the risk of the temperature of the boiler water being lowered by the combustion air.

As described in detail above, according to the present invention, the air nozzle 2 is located on the wall surface of the water tube wall forming the burner device insertion path C facing the outer surface of the air nozzle 2 of the burner device B.
By covering the root side with the heat insulating material 19 and thereby covering the tip side with the refractory material 21, it is possible to alleviate the imbalance in the outlet temperature of the boiler water from each pipe. In addition, since this refractory material 21 is provided on the side of the water tube wall that is the burner device insertion path C that is opposite to the outer surface of the air nozzle 2 of the burner device B and is closer to the combustion chamber 18, this part is exposed to the flame. The heat insulating material 19 is provided at a position where a part of the radiant heat from the flame in the combustion chamber 18 is blocked by the air nozzle 2, so that the heat insulating material 19 and the cover plate 20 It also prevents burnout.

[Brief explanation of drawings]

Fig. 1 is a perspective view from the combustion chamber side showing the conventional structure of the burner device installation part in a boiler, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a diagram according to the present invention. FIG. 3 is a cross-sectional view corresponding to FIG. 2 and showing an example of the water tube wall structure of the burner section of the boiler. 1... Air duct, 2... Air nozzle, 3...
Burner tube, 5...Fuel oil pipe, 6...Fuel injection nozzle, 15...Pipe, 16...Spacer plate, 17...Gap, 18...Combustion chamber, 19...Insulation material, 21...
Refractory material, A...boiler, B...burner device, C...
...burner device insertion path.

Claims (1)

[Scope of utility model registration request] In order to install a burner device equipped with an annular air nozzle around a fuel injection nozzle in a boiler formed by a water tube wall, the burner device is inserted into the water tube wall of the boiler so as to be surrounded by the water tube wall. In the case where the water tube wall is the burner insertion path facing the outer surface of the air nozzle of the burner device, the base side of the burner device is made of heat insulating material, and the tip side from this is made of fireproof material. A water pipe wall structure in the burner section of a boiler, characterized in that each wall is covered with a material.