JPS6335881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a boiler furnace wall support device, and more particularly to a boiler furnace wall support fitting that does not cause damage to the attachment portion between the furnace wall tube and the support fitting.

In boilers in which the furnace wall is constructed by arranging multiple stages of water tubes around the furnace, the furnace wall must often be supported in some way to provide reinforcement against the load caused by its own weight and the gas pressure within the furnace. Fig. 1 shows a method of supporting a furnace wall in a conventional once-through boiler, etc., in which furnace wall tubes 2 are gently raised around a furnace 1 to form a furnace wall. For support, a support fitting 3 is attached to the outside of the furnace wall, and is supported by a steel frame 5 via hanging bolts 4. FIG. 2 shows the details of the support by this support fitting, in which the support fitting 3 is applied to the furnace wall tubes 2 which are mutually connected by the strip plate 6 and constitute the furnace wall, and the support fitting 3 and the furnace wall tube The contact surfaces of 2 are fixed by welding 7. However, in this method, since the support fitting 3 and the furnace wall tube 2 are only in partial contact, there is a risk that the support strength will be insufficient.
Also, for the same reason, from the furnace wall tube 2 to the support fitting 3.
Heat transfer to the furnace wall tube 2 becomes insufficient.
A large temperature difference occurs between the support metal fitting 3 and the welding part 7, and thermal stress is concentrated on the welding part 7. Therefore, in addition to the lack of support strength mentioned above, the concentration of thermal stress has caused serious problems in terms of strength when supporting by conventional methods.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a support metal fitting that has high support strength and does not cause concentration of thermal stress on the welded portion.

In short, this invention uses a supporting metal fitting with two side plates,
It consists of a central plate for supporting hanging bolts placed in the center of this side plate, and the furnace wall engaging surface of the side plate is formed into a wave shape so as to come into close contact with the furnace wall, or this engaging surface is made into an independent block and substantially This is a continuous weld in the vertical direction.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 3 and 4, 3a is a side plate, and the furnace wall engaging end of this side plate 3a is connected to the furnace wall tubes 2 constituting the furnace wall and the strip plate 6 interposed between these furnace wall tubes. It is formed into a corrugated shape so that it can be tightly engaged. The corrugated shaped part is continuously welded vertically to the furnace wall tube 2 and the strip plate 6 by welding 7, and is connected and fixed over the entire surface. The center plate 8 is placed between the two side plates 3a fixed to the furnace wall in this way, and fixed by welding to the two side plates 3a, 3a. The center plate 8 functions as a connection part for hanging bolts (not shown) for supporting the furnace wall.

FIG. 5 shows another embodiment.

In this embodiment, blocks that closely engage the furnace wall tube 2 and the strip plate 3 are used instead of forming a corrugated engagement portion on the side plate. In the figure, 3c indicates this block, and each block 3c tightly engages with each groove so as to fill the groove formed by the furnace wall tube 2 and the strip plate 6, and is fixed by welding. After the joint surface is made almost flat by the block 3c in this way, the rectangular side plate 3b is welded and fixed to this flat part and connected to the side plate, and the block is made such that the side connected to the furnace wall becomes a corrugated part. Similarly to the above case, the center plate 8 is welded and fixed between the two side plates 3b. In this embodiment, there is no need to perform any molding on the side plates.

According to this invention, since the boiler furnace wall and the support fitting can be closely connected, the support strength can be increased.

In addition, the welding line, which is the main area of heat transfer, is substantially continuous in the vertical direction, which not only increases strength but also improves heat transfer from the furnace wall to the support fittings, so thermal stress does not concentrate in the welded area. Therefore, problems such as a decrease in support strength over time do not occur.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a boiler furnace showing a method of supporting the boiler furnace wall, Fig. 2 is a side view of a conventional support fitting,
FIG. 3 is a side view of the support fitting according to the present invention, and FIG.
This figure is a perspective view of the support metal fitting shown in FIG. 3, and FIG. 5 is a perspective view of the support metal fitting showing another embodiment. 2...Furnace wall tube, 3a, 3b...Side plate, 3c...
Block, 6... Band plate, 7... Welding, 8... Center plate.

Claims (1)

[Scope of Claims] 1. In a furnace wall support made by alternately positioning and connecting furnace wall tubes and strip plates whose tube axes are arranged horizontally, the side connected to the furnace wall is in close contact with the corrugated outer surface of the furnace wall. It is characterized by comprising two side plates which are formed in a straight line and whose close contact portions are continuously welded substantially vertically to the furnace wall tube and the strip plate, and a center plate which connects the two side plates. Boiler furnace wall support fittings. 2. The boiler furnace wall support fitting according to claim 1, wherein the side plate is formed in a corrugated shape on the side that comes into close contact with the furnace wall tube and the strip plate. 3. Claims characterized in that the side of the side plate connected to the furnace wall is connected to a block that is tightly welded and fixed to the groove formed by the furnace wall tube and the band plate to form a corrugated shape. The boiler furnace wall support fitting according to item 1.