JPS59112103A - Boiler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a once-through type, forced circulation type, natural circulation type boiler having an auxiliary flue, and more particularly to an arrangement structure of furnace wall tubes of the boiler. .

In conventional boilers with suspended contact heat transfer surfaces, as shown in Figure 1, there is a sub-flue (1) between the furnace (1) and the rear flue (2).
3) to effectively arrange the suspended heat transfer surface. The bottom (4) of the normal side flue (3) is configured downstream of the furnace rear wall pipe (5), and the side surface (6) is a water-cooled wall pipe that is separate from the furnace rear wall pipe (5). or consists of steam cooling pipes. Since the bottom surface (4) and side surface (6) of the sub-flue (3) are each formed of separate furnace wall tubes, the following drawbacks occur.

(1) As shown in Figure 2, the furnace wall tube joint between the bottom (4) and side (6) of the auxiliary flue is fillet welded between a scalloped bar (7) and a fin (8). Slightly inferior in sex.

(2) When the furnace wall tube that makes up the bottom of the auxiliary flue becomes the auxiliary flue rear hanger tube (9) shown in Figure 1 and reaches the top of the boiler ceiling, the ceiling pipe as shown in Figure 3 αO) and the hanger pipe (9) or the sleeve CL of the hanger pipe (9)
Full circumference welding is required.

(3) Since the furnace wall tubes constituting the bottom of the auxiliary flue and the furnace wall tubes constituting the sides are of different systems, each has its own outlet header α2, as shown in FIG. α3 is required.

The present invention is an attempt to improve the arrangement structure of the furnace wall tubes in response to the requirement that the furnace wall tubes be constructed on the bottom and side surfaces of the auxiliary flue.

That is, the present invention improves airtightness by reducing the number of defective seal welds on the peripheral wall and ceiling, which are a cause of boiler gas leaks, reduces costs by reducing the number of headers, and improves the boiler furnace wall tube system. The purpose is to improve reliability by simplifying.

The above purpose is to extend the tubes forming the furnace rear wall in a boiler in which the furnace wall and flue wall are composed of a large number of tubes, and a sub-flue is arranged between the furnace and the rear flue. The extension part is achieved by forming a bottom surface and a side surface of the sub-flue, and bending the bottom surface of the sub-flue in the boiler width direction, and then bending the bottom surface in the boiler height direction at both end portions. By configuring the upstream and downstream pipes on the bottom and side surfaces of the auxiliary flue, the number of seal welding points required for boiler airtightness on the boiler peripheral wall and ceiling can be reduced, and the auxiliary flue can be configured as follows: It is possible to reduce the number of outlet headers of furnace wall tubes.

Next, the present invention will be specifically explained based on the embodiments shown in FIGS. 4 to 8. In the above figures, members having the same reference numerals as those shown in FIGS. 1 to 3 indicate substantially the same members as those shown in FIGS. 1 to 3.

In FIGS. 4 and 5, the furnace rear wall tube (5) constitutes the auxiliary flue bottom (4) after passing through the deflection arch opening. As shown in the arrow view (4) in Fig. 5, the pipe oval is initially arranged parallel to the boiler depth direction at the bottom of the auxiliary flue (4), but then as shown in the arrow view (B) in the figure Then, the bottom surface (4) is bent in the boiler width direction to form a parallel tube device, and then, as shown in Fig. 4C), the bottom surface (4) is bent in the vertical direction, which is the boiler height direction, at both ends of the bottom surface. Aspect (6) Construct. For both the bottom surface (4) and the side surface (6), the fins (8) are welded together as shown in Figure 6, and the fins (8) are welded together as shown in Figure 7. There is a method of filling the refractory material 09 and stretching a skin casing (c) to ensure airtightness.
Either method is adopted.

Number of pipes αΦ on the bottom of the sub-flue (4) and required pipes α on the side
If the numbers do not match, use an appropriate number of forked pipes C17) as shown in FIG. 8 during this time so that the numbers of both can be adjusted.

Note that the pipe a< constituting the side surface of the sub-flue reaches one sub-flue outlet header αa on the left and right sides arranged at the upper part of the side surface (6).

By configuring the present invention as described above, the following effects are achieved.

(1) The bottom and side surfaces of the auxiliary flue are constructed from the upstream and downstream sides of the same pipe, so compared to the conventional auxiliary flue rear hanger pipe (
9) does not exist, and the entire circumference welding of the nozzle tube or sleeve αυ becomes unnecessary.

In addition, the seal welding of the joint between the bottom and side surfaces of the sub-flue can be done by highly reliable butt welding, making it possible to manufacture a boiler with excellent airtightness.

(2) Since the pipes forming the bottom and side surfaces of the sub-flue are the same and the system is simple, the reliability of the circulation of fluid within the pipe is high.

(3) Since the number of outlet headers of the pipes constituting the sub-flue can be reduced, the number of supporting devices can be reduced and the arrangement of the supporting parts can be simplified.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of a boiler with a conventional suspended contact heat transfer surface, Fig. 2 is an enlarged view of the main parts showing the welded part between the bottom and side surfaces of the boiler, and Fig. 3 is a ceiling pipe and a welded part. The welded part with the tube?
4 is a schematic side view of the auxiliary flue of the boiler of the present invention, FIG. 5 is a plan view taken from the I=I arrow in FIG. 4, and FIG. 6 is a welded part of the furnace wall tube. FIG. 7 is a cross-sectional view of another embodiment of FIG. 6, and FIG. 8 is a perspective view of a main part of the bifurcated pipe. 4. Bottom of auxiliary flue, 5. Rear wall tube of furnace, 6. Side, 8
...Fin, 12...Deflection arch, 13...
Pipe header, 14... Furnace wall tube, 15... It fire material, 16...
Skin casing, 17...-forked tube. Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Tue)〈 Fig. 7 □ No. 91:2 )' =13-〉 Evening] /ri

Claims (1)

[Claims] In a boiler in which the furnace wall and the flue wall are composed of a large number of tubes, and a sub-flue is arranged between the furnace and the rear flue, the tube forming the rear wall of the furnace is extended to form the sub-flue. The extension portion is bent in the width direction of the boiler at the bottom of the auxiliary flue, and then bent in the height direction of the boiler at both end portions of the bottom. Characteristic boiler.