JPH0449443Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wall box for a boiler furnace wall opening.

[Prior Art] A conventional wall box for the opening of a boiler furnace wall is shown in Fig. 7, in which a is a furnace wall tube forming the furnace wall, b is a wall box body, and c is a wall box fixed to the wall box body b. equipment mounting bracket,
The portion of the wall box side plate d forming the wall box body b that comes into contact with the furnace wall tube a is
The wall box main body b is joined to the furnace wall tube a by welding these processed portions to the furnace wall tube a.

[Problems to be solved by the invention] However, in the case of the above wall box,
During boiler operation, a temperature difference occurs between the furnace wall tube a and the wall box body b, and excessive thermal stress is generated at the welded joint between the wall box side plate d and the furnace wall tube a, and as a result, the furnace wall tube a There is a risk of cracks occurring on the surface.

The present invention was developed in view of the above circumstances, with the aim of preventing cracks from forming on the surface of the furnace wall tube.

[Means for solving the problem] The present invention welds a tapered bend plate to the required position of the furnace wall tube around the boiler furnace wall opening so as to be located between adjacent furnace wall tubes, and A flat part is formed by the boiler outer peripheral part of the furnace wall tube, and a collar-shaped plate is welded to the flat part in surface contact so as to surround the furnace wall opening, and the The wall box side plate of the wall box main body is welded to surround the furnace wall opening.

[Operation] During boiler operation, the temperature difference between the furnace wall tube and the plate is relatively small, and the temperature difference between the plate and the wall box side plate is large. For this reason, excessive thermal stress is generated at the welded portion between the plate and the wall box side plate, and there is a risk that a crack will occur in the plate or the wall box, but no crack will occur in the furnace wall tube.

[Example] Hereinafter, an example of the present invention will be described based on the accompanying drawings.

1 to 6 show an embodiment of the present invention.

Furnace wall tubes 1 constituting the furnace wall are bent to a required radius of curvature at the equipment attachment part, and are also bent in a direction that protrudes to the outside of the boiler so as not to interfere with the straight furnace wall tube 1. An opening 2 is formed in the opening 2 to allow installation of equipment without any trouble.

Taper bend plates 3 are disposed, for example, at predetermined positions above and below the opening 2 so as to be located between adjacent furnace wall tubes 1 . As shown in FIGS. 4 to 6, one end of the tapered bend plate 3 is located approximately on the same plane as the outer circumferential end of the furnace wall tube 1 on the outside of the boiler, the midway portion is bent, and the other end is bent. Adjacent furnace wall tubes 1 are connected to fins 1a that connect them, and welds 4 are applied to the abutting portions of the tapered bend plate 3, furnace wall tubes 1, and fins 1a. Thus, a flat portion 5 is formed by the portion of the tapered bend plate 3 located at the outer circumferential end of the furnace wall tube 1 on the outside of the boiler and the outer circumferential end of the furnace wall tube 1 on the outside of the boiler.

A brim-shaped plate 6 is fixed to the flat part 5 by welding 7, and has an opening so that the bent furnace wall tube does not interfere with it and does not interfere with the installation of equipment. , wall box side plates 9 constituting the wall box main body 8 are joined by welding 10. In the figure, reference numeral 11 indicates a device mounting bracket, and reference numeral 12 indicates a castable filled in the wall box main body 8.

Plate 6 is furnace wall tube 1 and taper bend plate 3
Since it is in surface contact with the flat part 5 formed by the boiler, there is a relatively small temperature difference with the furnace wall tube 1 during boiler operation.
Therefore, excessive thermal stress is not generated at the welded portion 7 of the plate 6. On the other hand, a temperature difference is likely to occur between the plate 6 and the wall box side plate 9, and excessive thermal stress acts on the weld 10, which may cause a crack in the plate 6 or the wall box side plate 9. However, even if a crack occurs, it will not damage the furnace wall tube 1 because it will be in the plate 6 or the wall box side plate 9, and therefore will not interfere with operation.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes may be made without departing from the gist of the present invention.

[Effects of the Invention] According to the wall box of the boiler furnace wall opening of the present invention, there is no risk of damaging the furnace wall tube, and the boiler can be operated safely, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is an explanatory perspective view of an embodiment of the present invention, Fig. 2 is an explanatory cross-sectional view of the present invention, Fig. 3 is an explanatory view of a boiler furnace wall opening to which the present invention is applied, and Fig. 4 is a detailed view of the part in Fig. 2, Fig. 5 is a plan view of Fig. 4,
FIG. 6 is a view taken along the - direction arrow in FIG. 4, and FIG. 7 is an explanatory perspective view of the conventional example. In the figure, 1 is a furnace wall tube, 3 is a tapered bend plate, 5 is a plan view, 8 is a wall box body, 9
indicates the wall box side plate.

Claims (1)

[Scope of utility model registration request] A tapered bend plate is welded to the required position of the furnace wall tube around the opening of the boiler furnace wall so as to be located between adjacent furnace wall tubes, and a flat part is formed by the taper bend plate and the outer circumference of the furnace wall tube outside the boiler. A flange-shaped plate is welded to the flat part in surface contact so as to surround the furnace wall opening, and a wall box main body is welded to the surface of the flange-shaped plate so as to surround the furnace wall opening. A wall box for a boiler furnace wall opening characterized by welded wall box side plates.