JP3810856B2 - Boiler equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boiler device, and more particularly to a ceiling wall support structure for a boiler device suitable for absorbing a difference in elongation of tubes.
[0002]
[Prior art]
First, a schematic configuration of the boiler device will be described with reference to FIGS. Among them, the outline of the furnace is shown in Fig.4.
[0003]
The boiler device is roughly composed of a furnace 24, a rear heat transfer unit 25, a ceiling wall 26 formed of a plurality of tubes, and a steel frame 27. The ceiling wall 26 is disposed above the furnace 24 and the rear heat transfer section 25, and is located inside a penthouse 34 formed in a box shape with a thin iron plate in order to seal the furnace internal pressure.
[0004]
The furnace 24 includes a wind box 29 in which a plurality of burners 28 are arranged in the lower part, a furnace main body 30 in which inner walls are formed by a plurality of spirally arranged tubes, a furnace upper part 31 in which tubes are arranged vertically to form inner walls, and a plurality of tubes Are composed of a plurality of furnace outlet headers 32 connected together. The ceiling wall 26 is fixed to the steel frame 27 via a plurality of ceiling supports 33.
[0005]
Next, the ceiling wall 26 will be described with reference to FIG. One of the tubes 1 constituting the ceiling wall 26 is connected to a plurality of ceiling wall inlet headers 35 installed on the furnace side, and the other is connected to a ceiling wall outlet header 36 installed on the rear heat transfer unit side. Connected to. Further, a plurality of furnace outlet headers 32 and ceiling wall inlet headers 35 installed in the upper part of the furnace are connected by a plurality of tubes, and FIG.
[0006]
The furnace 24, the rear heat transfer section 25, and the ceiling wall 26 are all formed of a plurality of tubes, and fluid flows through the tubes. This fluid flows from the lower part to the upper part of the furnace, but is heated by combustion in a burner part installed at the lower part of the furnace, rises up the spirally arranged tubes, and is arranged vertically in the upper part 31 of the furnace. Flowing into the tube. Thereafter, the fluid in the tube gathers into a plurality of furnace outlet headers 32 installed in the furnace upper portion 31 every several lines, and further enters into a plurality of ceiling wall inlet headers 35 to form the ceiling wall 26. It flows in the direction of the ceiling wall outlet header 36.
[0007]
By the way, the ceiling support 33 includes a rod 38 and a support bar 39 as schematically shown in FIG. The rod 38 has an upper end fixed to the upper steel frame, the support bar 39 is welded to the tube 1 constituting the ceiling wall 26 as shown in FIG. 9, and the rod 38 and the support bar 39 are pinned as shown in FIGS. 40 is connected.
[0008]
FIG. 5 is a plan view of the ceiling wall 26 portion, and the hatched portion represents the support bar 39 shown in FIGS. As shown in FIG. 5, the support bar 39 is one continuous piece perpendicular to the longitudinal direction of the tube 1 constituting the ceiling wall 26 and over all the tubes, and includes a ceiling wall inlet header 35 and a ceiling wall outlet header. There are several places in between.
[0009]
Each support bar 39 is joined to the penthouse 34 by a steel plate called a tension tie 37 at both ends. FIG. 8 shows a part of one ceiling support 33, and a plurality of rods 38 are installed on one support bar 39. Thus, the ceiling support 33 supports the force in the direction perpendicular to the tube 1 axis of the ceiling wall 26 due to the wind pressure in the penthouse 34 and transmits the weight of the ceiling wall 26 to the upper steel frame 27. The present invention relates to a joint portion between the support bar 39 and the tube 1, and particularly relates to a joint structure suitable for absorbing a difference in elongation of the tube 1.
[0010]
A joint portion between the conventional support bar 39 and the tube 1 constituting the ceiling wall 26 is shown in FIGS. The plurality of tubes 1 are arranged in parallel in the same plane and form a ceiling wall 26. A plurality of support bars 39 are installed at right angles to the axial direction of the tube 1 and at the upper part of the tube 1, and the lower part of the support bar 39 and the contact part of the tube 1 are fixed by welding. The support bar 39 and the tube 1 are welded in a staggered manner as shown in FIG.
[0011]
In boiler apparatus having the configuration described above, if the resulting fluid to a temperature variation in the tube constituting the furnace ceiling wall inlet header 35 the variation of the temperature is intact downstream side, further brought into the ceiling wall 26 Therefore, a temperature difference is generated in each internal fluid of the tube 1 constituting the ceiling wall 26. When a difference in elongation due to thermal expansion occurs in each tube 1 due to this temperature difference, the tube 1 is welded and fixed to the support bar 39 at regular intervals as described above in the conventional structure. Some may be greatly deformed.
[0012]
[Problems to be solved by the invention]
In the above prior art, when a temperature difference occurs in the fluid in the tube 1 constituting the ceiling wall 26 and a difference in elongation due to thermal expansion occurs in the tube 1, the tube 1 is not structured to absorb this. Some may be greatly deformed.
[0013]
An object of the present invention is to provide a boiler device that eliminates the disadvantages of the prior art and has no deformation of the tubes constituting the ceiling wall.
[0014]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a ceiling wall inlet header, a ceiling wall outlet header, and a tube that constitutes a ceiling wall by connecting one to the ceiling wall inlet header and the other to the ceiling wall outlet header. And a steel frame for fixing the ceiling wall, a support bar installed in a direction orthogonal to the axial direction of the tube, and a rod for connecting the support bar and the steel frame,
The support bar is divided into a plurality of portions, and the joint portions of the divided support bars with the tube are welded, and the divided support bars are connected by a connecting member with a gap, and for each of the divided support bars The rod is arranged .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Conventionally, since each individual tube was welded and fixed to one support bar, the difference in elongation was determined by the maximum elongation and the minimum elongation in the tube. However, as shown in the present invention, multiple support bars are used. Since the structure is divided, the difference in elongation is determined by the maximum elongation and the minimum elongation of the tube for each division, so that the elongation can be reduced with respect to the conventional structure. Further, since the support bars are connected to each other with a gap G as shown in FIG. 3, the axial displacement of the tube between the support bars can be absorbed by the gap.
[0016]
Therefore, even if a difference in elongation occurs between the individual tubes welded and fixed to the support bar, there is no problem that a part of the tubes is deformed.
[0017]
Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, this structure is divided into a plurality of support bars 2 to 4, rods 5 to 7 arranged for each of the support bars 2 to 4, and plates 8 to 11 (10, 10) connecting the support bars 2 to 4. 11 is not shown), pins 12 to 15 (14 and 15 are not shown), and stoppers 16 to 23 (20 to 23 are not shown). Here, the support bars 2 to 4 and the tube 1 are joined by welding.
[0018]
The connecting portions of the adjacent support bars will be described by taking support bars 2 and 3 as an example. The plates 8 and 9 are attached to predetermined positions on both surfaces of the joint portions of the support bars 2 and 3, the pins 12 and 13 are inserted into the holes provided in the plates 8 and 9 and the support bars 2 and 3, and both ends of the pins 12 and 13 are inserted. The stoppers 16 to 19 are attached and fixed in a state where a gap is secured between the plates 8 and 9. Here, in the state where the plates 8 and 9 and the support bars 2 and 3 are attached at predetermined positions, the plates 8 and 9 are formed with appropriate holes through which the pins 12 and 13 are inserted with a clearance.
[0019]
Here, although the example which formed the round hole and the long hole in the plate 8 was shown in FIG. 2, both holes may be made into a round hole or may be comprised by a long hole. Similarly, the holes through which the pins 12 and 13 provided in the support bars 2 and 3 are inserted may be round holes or long holes as long as they are formed with a clearance with respect to the pins 12 and 13. Fixing between the support bar and the rod and between the rod and the steel frame has the same structure as that shown in the conventional example. In the above-described embodiment, the support bar is divided into three parts. However, other divisions such as two divisions and four divisions can be similarly implemented. Moreover, although the example which fixes the both ends of the pin of a connection part with a stopper was shown, it can replace with another fixing means.
[0020]
【The invention's effect】
To provide a boiler device that does not deform the tube because the temperature difference between multiple tubes fixed between the support bars can be leveled compared to the conventional method, and the expansion difference in the tube axis direction between the support bars can be absorbed by the connecting part. Can do.
[Brief description of the drawings]
FIG. 1 is a side view of a ceiling wall according to an embodiment of the present invention.
FIG. 2 is an enlarged side view of a plate used for the ceiling wall.
FIG. 3 is a partially enlarged plan view showing the connection of support bars on the ceiling wall.
FIG. 4 is a side view showing a schematic configuration of a furnace.
FIG. 5 is a plan view showing a schematic configuration of a furnace.
FIG. 6 is a development view showing the ceiling wall of the furnace.
FIG. 7 is a schematic diagram for explaining a ceiling support.
FIG. 8 is a side view of a conventional ceiling wall.
FIG. 9 is a plan view showing a connection between a support bar and a tube in a conventional ceiling wall.
[Explanation of symbols]
1 Tube 2-4 Support bar 5-7 Rod 8-11 Plate 12-15 Pin 16-23 Stopper G Gap

Claims (1)

A ceiling wall inlet header, a ceiling wall outlet header, a tube that connects one to the ceiling wall inlet header and the other to the ceiling wall outlet header to form the ceiling wall, and a steel frame that fixes the ceiling wall; A support bar installed in a direction orthogonal to the axial direction of the tube, and a rod connecting the support bar and the steel frame;
The support bar is divided into a plurality of portions, and the joint portions of the divided support bars with the tube are welded, and the divided support bars are connected by a connecting member with a gap, and for each of the divided support bars A boiler device in which the rod is arranged .

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