JP5442306B2 - How to block boiler flue - Google Patents

Description

  The present invention relates to a boiler flue blocking method for blocking (cutting off) a boiler flue connected to a chimney.

  For example, in a power generation facility in which multiple boilers are connected to a common chimney via a flue, it is necessary to block the flue from a boiler from the chimney due to flue switching or system change (For example, refer to Patent Document 1). Conventionally, as shown in FIG. 5, this blockage removes a heat insulating material (not shown) disposed on the outer periphery of the flue 101 and disassembles and removes the upstream side 101 a of the flue 101. Then, while the closing plate 102 is suspended by the tow truck 103, the closing plate 102 is welded to the opening on the downstream side 101b of the flue 101 to cut off.

Japanese Patent Application Laid-Open No. 05-079604

  By the way, in the conventional interruption | blocking method, since it is necessary to remove a heat insulating material, and also to disassemble and remove a part of flue 101, you must provide the big scaffold for removal work on the outer side of the flue 101. It took a lot of labor, time and money. Further, since the upstream side 101a of the flue 101 is melted and removed from the outside, the downstream side 101b may be damaged or collapsed, and the downstream side 101b may have to be reinforced to prevent damage or collapse. there were.

  Accordingly, an object of the present invention is to provide a boiler flue blocking method that can easily and quickly block a boiler flue.

The invention according to claim 1 in order to achieve the above object, a closing body for closing the cross section perpendicular to the flow direction of the boiler flue, a plurality of cut-off of the loading possible size in the boiler flue Constituted of members, from the hatch or manhole of an existing shutter housing , carrying the blocking member into the blocking location of the boiler flue, welding the blocking member from the inside of the boiler flue to the boiler flue, and The boiler flue blocking method is characterized in that the blocking members are welded to each other, and a cross section of the boiler flue is closed with a plurality of the blocking members.

According to the present invention, the closing body is constituted by a plurality of blocking members, and each blocking member is carried into the blocking location of the boiler flue from the hatch or manhole of the existing shutter housing . And while connecting each interruption | blocking member to a boiler flue from the inner side of a boiler flue, the interruption | blocking members are connected, the cross section of a boiler flue is plugged up, and a boiler flue is interrupted | blocked.

  According to the first aspect of the present invention, the boiler flue is blocked by connecting a plurality of blocking members from the inside of the boiler flue without disassembling and removing a part of the boiler flue. For this reason, it is not necessary to install large scaffolds or heat insulation materials accompanying the dismantling and removal of the boiler flue. Work safety is increased. In addition, there is no need to reinforce the non-removal side associated with the dismantling and removal of the boiler flue. In this way, the boiler flue can be blocked easily and in a short time.

Further, since the blocking member is carried in using the hatch or manhole of the existing shutter housing, it is not necessary to newly provide a carry-in port, and the boiler flue can be blocked more easily and in a short time.

It is a flowchart of the blocking method of the boiler flue which concerns on embodiment of this invention. FIG. 2 is a perspective view showing a state where a blocking plate is carried into a blocking portion in the blocking method of FIG. 1. FIG. 2 is a front view showing a state in which a blocking plate and a vertical beam are assembled in the blocking method of FIG. 1. FIG. 2 is a diagram illustrating a state where a work scaffold is installed in the blocking method of FIG. 1. It is a figure which shows the conventional blocking method of a flue.

  The present invention will be described below based on the illustrated embodiments.

  FIG. 1 is a flowchart of a boiler flue blocking method according to an embodiment of the present invention. This boiler flue blocking method is a method of blocking (separating) the boiler flue connected to the chimney. Here, as shown in FIG. 2, the downstream side 12 of the boiler flue 1 is connected to a chimney (not shown), and the exhaust gas from the boiler side flows into the chimney via the boiler flue 1. ing. Further, the boiler flue 1 is provided with a shutter housing 3 that houses a shutter for shutting off the exhaust gas. In this embodiment, the position where the existing shutter housing 3 is disposed is defined as the blocking location of the boiler flue 1. And

  In this boiler flue blocking method, first, the blocking plates 21 to 24 and the vertical beam 25 are manufactured (step S1). The blocking plates 21 to 24 and the vertical beam 25 constitute a blocking plate (blocking body) 2 for closing the cross section 1a perpendicular to the flow path direction of the boiler flue 1 and can be carried into the blocking portion of the boiler flue 1 This is a large-sized blocking member. Specifically, as shown in FIG. 3, each of the blocking plates 21 to 24 is a substantially pentagonal flat plate, and the vertical beam 25 is a beam (columnar shape) having a substantially rectangular cross section. And it can be carried in into the boiler flue 1 from the hatch 31 of the shutter housing 3 as will be described later, and the blocking plates 21 to 24 and the vertical beam 25 are connected to constitute the closing plate 2 as will be described later. At that time, the size and shape of the boiler flue 1 are set so that the cross section 1a of the boiler flue 1 is closed by the plane. Further, reinforcing members such as angle members are disposed on the respective shielding plates 21 to 24 as necessary, and such shielding plates 21 to 24 and the vertical beam 25 are manufactured.

  Next, the hatch 31 located at the upper part of the shutter housing 3 is opened (step S2), and as shown in FIG. 4, inside the upstream side 11 and the downstream side 12 of the boiler flue 1 with the shutter housing 3 as a boundary, The work scaffold 4 is installed (erected) (step S3). Here, the operations of steps S1 to S3 may be performed simultaneously or the order may be changed. In other words, the work scaffold 4 may be installed simultaneously with the production of the shielding plates 21 to 24, or the shielding plates 21 to 24 may be produced after the work scaffold 4 is installed.

  Subsequently, the existing shutter fixing support and partition plate disposed in the shutter housing 3 are removed (step S4), and then the respective blocking plates 21 to 24 and the vertical beam 25 are blocked from the boiler flue 1. It is carried into the place and assembled (step S5). That is, using the crane, the blocking plates 21 to 24 and the vertical beam 25 are carried into the shutter housing 3 (blocking location) from the hatch 31 of the shutter housing 3 and assembled upstream of the shutter housing 3. Here, assembling of the shielding plates 21 to 24, etc., as shown in FIG. 3, the shielding plates 21 to 24 and the vertical beam 25 are arranged on the same plane, and the plane 1a of the boiler flue 1 is closed by the plane. And assembled so as to be in contact with the upstream wall 32 of the shutter housing 3.

  In this state, from the inside of the boiler flue 1, the blocking plates 21 to 24 and the vertical beams 25 are welded (connected) to form the closing plate 2, and the closing plate 2 is connected to the boiler flue 1 ( Step S6). Here, the connection of the closing plate 2 to the boiler flue 1 is performed by sealing the surface of the upstream side of the closing plate 2 (the side where the cross section 1a of the boiler flue 1 contacts) along the periphery of the cross section 1a of the boiler flue 1 Welding is performed by tack welding (temporary welding) the downstream surface of the closing plate 2 to the upstream wall 32 of the shutter housing 3 along the outer peripheral edge of the closing plate 2. In this way, the cross section 1 a of the boiler flue 1 is closed with the closing plate 2 by welding the closing plate 2 directly to the shutter housing 3.

  Next, the quality determination of welding is performed (step S7). Specifically, with the foaming liquid applied to the upstream side of the welded part, air is blown from the downstream side, and the presence or absence of cracks in the welded part is determined by checking the presence or absence of a change in the shape of the foamed liquid. Perform a shower test. Moreover, in the location where this shower test is difficult, a pass / fail judgment is performed by PT (solvent removal penetration test). If a welding failure is confirmed, the welding failure portion is repaired (step S8), and the quality is determined again (step S7). And after confirming that there is no welding defect, the work scaffold 4 is disassembled and removed (step S9).

  As described above, according to this boiler flue blocking method, the boiler flue 1 is welded from the inside of the boiler flue 1 without disassembling and removing a part of the boiler flue 1, and the boiler smoke. Block road 1. That is, it is not necessary to install a large scaffold outside the boiler flue 1 for dismantling and removal, it is only necessary to install a relatively small working scaffold 4 in the boiler flue 1, and it is necessary to remove the heat insulating material. Nor. For this reason, installation of a scaffold, dismantling work, a tow truck, crane work, etc. are reduced, labor, time, and cost can be reduced, and work safety is enhanced. Moreover, it is not necessary to reinforce the downstream side 12 when the upstream side 11 of the boiler flue 1 is disassembled and removed.

  Furthermore, since the position where the existing shutter housing 3 is disposed is used as a blocking location, and the blocking plates 21 to 24 and the like are loaded using the hatch 31 of the shutter housing 3, it is not necessary to newly provide a loading port. Further, since the closing plate 2 is directly welded to the shutter housing 3, the closing plate 2 can be easily and properly disposed. As a result, the boiler flue 1 can be blocked easily and in a short time.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the blocking plates 21 to 24 and the like are carried in from the hatch 31 of the shutter housing 3, but depending on the blocking location etc., the blocking plate is moved from the manhole provided in the boiler flue 1 or the chimney. 21-24 etc. may be carried in. Further, the closing plate 2 is mainly composed of the blocking plates 21 to 24 and the vertical beam 25, but more blocking members depending on the size of the entrance, the shape and size of the cross section 1a of the boiler flue 1, and the like. Alternatively, it may be configured with a small number of blocking members.

DESCRIPTION OF SYMBOLS 1 Boiler flue 1a Section 11 Upstream side 12 Downstream side 2 Blocking board (blocking body)
21-24 Blocking plate (blocking member)
25 Vertical beam (blocking member)
3 Shutter housing 31 Hatch 32 Upstream wall 4 Working scaffold

Claims (1)

The closing body for closing the cross section perpendicular to the flow direction of the boiler flue, composed of a plurality of blocking members of the loading possible size in the boiler flue,
From the hatch or manhole of the existing shutter housing , carry the blocking member into the blocking location of the boiler flue ,
A boiler characterized in that the blocking member is welded to the boiler flue from the inside of the boiler flue, and the blocking members are welded together to block a cross section of the boiler flue with the plurality of blocking members. How to block the flue.

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