JPS6016807Y2 - Furnace with wall tubes arranged in a spiral pattern - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of the tube bending structure of a burner section of a furnace in which wall tubes are arranged in a spiral manner.

In a conventional furnace, the furnace wall tube 2 is arranged vertically, as shown in a front view and a cross-sectional view in FIGS. 1 and 2, respectively, and from a burner nozzle 102 and an auxiliary air nozzle 103 as shown in FIG. Several burner wind boxes 101 are integrated into one upper and lower sides, and burner tube bending openings 100 are provided above and below the furnace, as shown in the perspective view in FIG. 4, so that each burner nozzle in the wind box faces the furnace. It is designed so that it can be inserted.

Therefore, this tube bending structure is relatively simple.

However, in recent years, with the development of nuclear power generation, thermal power generation has been operated under intermediate load conditions, and there is a demand for power generation plants that are excellent in load change characteristics, start-stop characteristics, and are highly efficient at low loads.

A large-capacity supercritical pressure variable pressure operation boiler has been developed as a boiler that meets these demands, but this furnace is equipped with a spirally wound furnace wall tube 2, as shown in a perspective view in Fig. 5. It is configured.

In such a spiral furnace, an independent burner 101
If a is used, each tube is individually arranged, so the tube bending shape is relatively simple as shown in FIG. 6, for example.

However, it has become necessary to attach an integrated upper and lower wind box to spiral furnaces as well.

In response to this demand, the present invention aims to improve the tube bending structure of the burner section.

When adopting a burner type in which burner wind boxes are integrated in the upper and lower sides of a furnace consisting of spirally wound furnace wall tubes, the tube bending structure allows the burner nozzle, auxiliary air nozzle, etc. to be placed inside the furnace. having an opening for insertion;
Consideration has been given to an arrangement that facilitates gas sealing of the furnace wall tube group and allows complete draining of the drain inside the furnace wall tubes.

That is, in the present invention, in a furnace in which wall tubes are arranged in a spiral shape, the tubes constituting the furnace are bent toward the outside of the furnace at or near a corner of the furnace to form a tube bending block for installing a burner. A plurality of tubes are taken out and bent out of the furnace, arranged horizontally and vertically to form the left side section, then bent horizontally to form the front partition wall, and then bent vertically and horizontally again to form the right side section. Finally, the pipes are bent back to the furnace wall surface again, and the ceiling and bottom surfaces form an eave-like surface formed by a group of tubes from the left side section, and then the right side section is returned to the furnace wall surface. By forming a block, openings are provided vertically in the front part, and partition walls made of the furnace wall tubes themselves are provided at intervals, so that the furnace wall tubes are closely aligned and are always bent in the upward direction. It is characterized by being arranged.

The furnace has wall tubes arranged in a spiral pattern.

Hereinafter, a preferred embodiment of the present invention illustrated in FIG. 7a of the accompanying drawings will be described in detail.

The burner tube bending structure according to the present invention is shown in Fig. 7-a, which is a perspective view showing the left side part, front part, and frame mounting parts, and Fig. 7b, which is a perspective view showing the front part and right side part. Furnace wall tubes 2 containing fluid 1 are arranged in a spiral manner to form a furnace 3, and bent tube blocks 4 are installed at each corner of the furnace to incorporate burners.

The bent pipe block has a left side part 5 and a front part 6 when viewed from outside the furnace.
, a right side surface portion 7, a ceiling portion 8, and a bottom portion 9.

Since the bottom part 9 is vertically symmetrical with the ceiling part 8, it is omitted in the drawing.

A mounting frame 10 is welded to the bent pipe block 4, and a vertically integrated burner wind box 12 is mounted thereto.

Combustion parts 11 such as a burner nozzle and a burner gun are attached to the inside of the burner box and inserted into the opening of the front part 6.

The general part of the tube bending block 4 is the burner section furnace wall tubes 15 to 28.
These are bent outward from the furnace wall surface at the bending start point 13, arranged horizontally and vertically to form the left side section 5, and further bent horizontally to form the partition wall of the front section 6. Thereafter, it is bent vertically and horizontally again to form the right side part 7, and at the bending end point 14, it is returned to the furnace wall surface and connected to the furnace wall surface.

The ceiling part 8 is made into an eave-like surface with a group of tubes from the left side part consisting of the burner part furnace wall tubes 29 to 55, and then after forming the right side part, it is returned to the furnace wall surface to form the general part 15 to 55 as shown in the drawing. The tube bending block 28 is arranged so as to completely fill the space on the left side and the ceiling of the tube bending block.

The bottom portion 9 also has the same configuration as the ceiling portion.

As shown in the diagram, the number of tubes in the furnace wall of the burner section is 1 for the general section.
The number is 5 to 28, but an appropriate number can be selected depending on the width of the front section 6 (width of the burner opening).

In addition, there are 27 pieces numbered 29 to 55 on the ceiling.
Similarly, by appropriately selecting the width of the front section 6 and the angle of the ceiling surface, an appropriate number can be obtained.

By adopting the pipe bending structure according to the present invention, the eighth
As shown in the perspective view in Fig. a, the burner furnace wall tubes 2 are closely connected to each other and are arranged on the left side, front side, right side,
Since it forms a box shape with the ceiling and bottom, it is easy to seal gas and air.

That is, by connecting the pipes with a seal fin and a seal rod 105 as shown in FIG. 8b, or by providing a fin 106 and a casing 107 as shown in FIG. 8c, sealing can be easily and completely performed. can.

Furthermore, all the burner furnace wall tubes are arranged in the upward direction, so that the flow inside the tubes is smooth and the drain inside the tubes can be easily removed.

In addition, in the front part 6, the tube group is arranged horizontally and assembled so as to form an opening.
As shown in the cross-sectional view along the line -IX, it is possible to easily connect the vertically integrated burner wind box to the partition plate 108 provided to separate each burner stage. At the same time, burner accessories such as the burner nozzle 102 and burner gun can be inserted toward the furnace.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional burner tube bending structure, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a front view of a structure with an integrated burner wind box. Figure 4 is a perspective view of a conventional furnace, Figure 5 is a perspective view of a spiral furnace, Figure 6 is a perspective view showing a tube bending structure when a single burner is installed in a spiral furnace, and Figure 7a is a perspective view of a spiral furnace. Perspective view showing the left side part, front part, and burner parts of the burner tube bending structure, No. 7
Figure b is a perspective view showing the right side and front part, Figure 8a is a perspective view showing details of the tube bending structure, Figures 8b and 8c.
The figure is a perspective view showing a method of sealing the tube bending structure, and FIG. 9 is a sectional view taken along line IX-IX in FIG. 8a. 2... Furnace wall tube, 3... Furnace, 4...
...Pipe bending block, 5... Left side part, 6.
...Front part, 7...Right side part, butt part...
...Ceiling part, 9...Bottom part, 10...Mounting frame, 11...Combustion parts, 12...
Burner style box, 13... Bending start point, 14...
...Bending end point.

Claims (1)

[Scope of utility model registration request] In a furnace in which wall tubes are arranged in a spiral, the tubes constituting the furnace are bent toward the outside of the furnace at or near a corner of the furnace to form a tube bending block for installing a burner. At this time, a plurality of tubes are taken out. They are then bent outwards from the furnace, arranged horizontally and vertically to form the left side section, then horizontally bent to form the front partition wall, then bent vertically and horizontally again to form the right side section, and finally By forming the tube bending block in such a manner that it is returned to the furnace wall surface of the furnace again, and the ceiling and bottom portions are made into eaves-like surfaces with a group of tubes from the left side surface portion, and then the right side portion is formed and then returned to the furnace wall surface. The furnace wall tubes are characterized by having openings extending vertically in the front part, partition walls formed by the furnace wall tubes themselves at intervals, and the furnace wall tubes being closely aligned and always bent and arranged in an upward direction. A furnace with wall tubes arranged in a spiral.