JP2007107787A - Installation method of boiler facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an installation method of boiler facility, capable of shortening the process for suspending a rear heat transfer part or a horizontal heat recovery device, reducing temporary steel products, and improving safety. <P>SOLUTION: This method comprises steps of lowering a suspending wire 39 from a plurality of jack devices 31 set on support steel frames of a ceiling part 4 to suspend rear heat transfer walls 12 and 13 at a low position by the wires 39; mounting the heat recovery device 32 within the suspended rear heat transfer walls 12 and 13; and driving the jack devices 31 at equal speeds to lift up and fix the rear heat transfer walls 12 and 13 supporting the heat recovery device 32 at a predetermined position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an installation method for boiler equipment, and more particularly to an installation method for a rear heat transfer wall and a heat recovery device.

  FIG. 7 is a schematic configuration diagram of a large boiler facility for commercial thermal power generation. In the case of such a large boiler, the boiler building F is constructed with supporting steel frames such as columns and beams, and the boiler body 1 is suspended by sling bolts 3 with the upper ceiling beam 2 of the boiler building F as a supporting point.

  The boiler body 1 has a ceiling 4 formed of a heat transfer tube wall surrounded by a wall (heat transfer tube wall) in which flat heat transfer parts such as membranes or fins and heat transfer tubes are alternately arranged and integrated by welding. The upper part is closed, and the outside of the heat transfer tube wall is heat-treated as necessary. Reference numeral 6 denotes a penthouse, which is a space formed between the ceiling beam 2 and the ceiling 4.

    The interior of the boiler body 1 is roughly divided into a furnace chamber 7 for burning fuel, a front side wall chamber 8 and a rear heat transfer wall chamber 9, and combustion exhaust gas generated in the furnace chamber 7 is the furnace chamber 7, the front side wall chamber 8, and the rear part. It flows in the order of the heat transfer wall chamber 9.

  Inside the furnace chamber 7 and the front wall chamber 8, a number of suspended heat transfer tube devices 10 are suspended from the ceiling beam 2 by the sling bolts 3 with the respective outlet headers 11 provided in the penthouse 6 as support points. ing. In the case of a large boiler, the uppermost outlet header 11 has a height of 70 m or more from the ground.

  A rear heat transfer chamber 9 surrounded by a front partition wall 12 and a rear partition wall 14 each formed of a heat transfer tube wall is divided into a rear heat transfer wall front chamber 9a and a rear heat transfer wall by a central partition wall 13 formed of a heat transfer tube wall. It is divided into a rear chamber 9b. Reference numeral 15 denotes a hanging pipe.

  A reheater 20a as a heat recovery device is arranged in the rear heat transfer wall front chamber 9a, and a superheater 20b, an evaporator 20c, and a economizer 20d as heat recovery devices are arranged in the rear heat transfer wall rear chamber 9b, respectively. ing. The reheater 20a, the superheater 20b, the evaporator 20c, and the economizer 20d are configured by a horizontal heat recovery device.

  The coils are arranged in 100 to 300 rows in accordance with the pitch of the heat transfer tubes on the heat transfer tube wall, that is, at intervals of about 100 mm in the boiler furnace width direction perpendicular to the paper surface. In the case of the illustrated boiler, the reheaters 20a are arranged in three stages in the height direction.

    Next, a conventional installation method for a horizontal heat recovery apparatus such as the reheater 20a, the superheater 20b, the evaporator 20c, and the economizer 20d will be described.

  The rear heat transfer wall forming the rear heat transfer chamber 9 is configured in a panel shape, and is lifted up to the final installation position for each panel, and the front partition 12, the central partition 13, the rear partition by connecting the panels. 14 is configured.

  After that, a temporary monorail and winch for pulling in the heat transfer tubes are installed inside the furnace on the ceiling wall, the horizontal heat recovery device is pulled up from the ground to the installation level with the winch, and pulled to a predetermined position with the monorail. Then, the end support of the horizontal heat recovery device was temporarily installed by hooking it on the rear heat transfer wall, and then the next horizontal heat recovery device was repeatedly lifted in the same procedure.

  Alternatively, the rear heat transfer wall and the horizontal heat recovery device assembled on the ground outside the boiler building using a temporary base are loaded into the furnace bottom and jacked up using a built-up lifting balance, A hot wall and a horizontal heat recovery device were hung up.

  In addition, about the installation method of boiler equipment, the following patent documents can be mentioned, for example.

JP-A-5-306802

The conventional installation method described above has the following problems to be solved.
(1) It is necessary to install a temporary monorail for pulling in the horizontal heat recovery device at the lower part of the ceiling wall, and a large amount of temporary steel is required.
(2) When using a temporary mount and jacking up an assembly assembled on the ground, a large amount of steel is required for the temporary mount and the temporary suspension balance.
(3) Since each horizontal heat recovery device must be repeatedly lifted from the ground to a height of about 50 m, shortening the process is difficult.

(4) Since each horizontal heat recovery device is installed by being lifted up to a position of about 50 m from the ground, the installation work is a high place work, which is very dangerous.

  The object of the present invention is to solve such problems in the prior art, shorten the suspension process of the rear heat transfer section and the horizontal heat recovery device, reduce temporary steel materials, and improve the safety of boiler equipment. Is to provide.

In order to achieve the above object, the present invention includes a process of lowering a lifting wire from a plurality of jack devices installed on a support steel frame of a ceiling part, and suspending a rear heat transfer wall at a low position on the wire,
Attaching a heat recovery device in the suspended rear heat transfer wall;
A step of driving the plurality of jack devices at a constant speed to pull up and fix a rear heat transfer wall supporting the heat recovery device to a predetermined position.

  The present invention is configured as described above, and can shorten the suspending process of the rear heat transfer section and the heat recovery apparatus, reduce temporary steel materials, and improve safety.

  Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 are schematic configuration diagrams for explaining a hanging method according to an embodiment of the present invention, FIG. 5 is a partially enlarged perspective view of a horizontal heat recovery apparatus, and FIG. 6 is a horizontal view with respect to a rear heat transfer wall. It is a partially expanded perspective view for demonstrating the support structure of a standing heat recovery apparatus.

  For example, as shown in FIG. 1 and the like, a plurality of jack devices 31 are installed on a steel frame corresponding to the rear heat transfer portion of the ceiling beam 2, and the jack device 31 is configured to have a rear heat transfer wall or a horizontal installation. Used to suspend the heat recovery device 32 and support the rear heat transfer wall header.

  As shown in FIG. 5, there are a plurality of coils 33 (usually 4-6) of the horizontal heat recovery device 32 (corresponding to the reheater 20a, superheater 20b, evaporator 20c, economizer 20d, etc. in FIG. 7). This pipe is bent and shaped into a spiral shape by welding to form one coil 33, which is vertically supported by a band 35. Spacers 34 are interposed between the coils 33, respectively. The upper end of each band 35 is supported by a rear heat transfer wall inlet header 37 via a support rod 36.

  Further, as shown in FIG. 6, end supports 38 are welded and fixed to the outermost peripheral side ends (both corners) of each coil 33, and although not shown, an engagement hole or the like is provided on the lower surface of the end support 38. The engaging portion is provided.

  Each horizontal heat recovery device 32, the front partition 12, the central partition 13, the economizer casing 41, and the like are preliminarily assembled on the ground in advance.

  Next, the installation method of the rear heat transfer wall and the horizontal heat recovery apparatus will be described with reference to FIGS. First, as shown in FIG. 1, the sling wires 39a and 39b are lowered from the jack devices 31 and 31, respectively, and the upper end portion of the front partition 12 formed in a panel shape is connected to one sling wire 39a using the rough terrain crane 40. The upper end of the central partition 13 is connected to the other sling wire 39b. Then, the front partition wall 12 and the central partition wall 13 are lifted to the same level at a low position slightly higher than the height of the economizer casing 41.

  Next, using the rough terrain crane 40, the upper end of the front economizer casing 41a formed in a panel shape is connected to the lower end of the front partition 12 while the upper end of the rear economizer casing 41b is connected. Is connected to the lower end of the central partition 13 (see FIG. 2).

  Next, in the rough terrain crane 40, the horizontal heat recovery device 32a functioning as a economizer is lifted and placed between the front economizer casing 41a and the rear economizer casing 41b, and the horizontal heat recovery device 32a. The front and rear are attached to the economizer casing 41. Subsequently, the horizontal heat recovery device 32b functioning as an evaporator is lifted by the rough terrain crane 40, and is inserted between the front partition wall 12 and the central partition wall 13, and the front partition wall 12 and the central partition wall are placed before and after the horizontal heat recovery device 32b. Attach to 13.

  Because of the use of the rough terrain crane 40, the plurality of horizontal heat recovery devices 32a to 32c are sequentially incorporated from the lower side.

  As shown in FIG. 6, a support lug 43 having a substantially U-shaped planar shape is welded and fixed at a position facing the transverse heat recovery device 32 on the outer peripheral surface of the heat transfer tube 42 constituting the rear heat transfer wall. ing. On the upper surface of the support lug 43, an engagement protrusion 44 is provided so as to protrude upward.

  When each of the horizontal heat recovery devices 32 is installed on the rear heat transfer wall, the end supports 43 are disposed on both sides of the support lug 43 as shown in FIG. The horizontal heat recovery devices 32 are positioned by being inserted into the 43 engaging portions (engagement holes) and supported by the rear heat transfer wall.

  As shown in FIG. 3, when each horizontal heat recovery device 32 is still in a low position, butt welding of the horizontal heat recovery devices 32 is performed.

  Thereafter, the jack devices 31 and 31 are driven at a constant speed, the rear heat transfer wall and each heat recovery device 32 are jacked up to a predetermined position together, fixed at that position, and fixed to the rear heat transfer wall and each heat. The installation of the collecting device 32 is finished. FIG. 4 shows this state.

  After the installation is completed in this way, the jack devices 31, 31 function as a support device for the rear heat transfer wall header.

  It is more efficient to prepare each rear heat transfer wall in advance according to the furnace width and lift it up to a predetermined position at one time. The rear heat transfer wall may be configured by lifting up to a predetermined position in panel units and welding in that state.

It is a schematic block diagram for demonstrating the installation method of the rear part heat-transfer wall which concerns on embodiment of this invention, and each heat recovery apparatus. It is a schematic block diagram for demonstrating the installation method of the rear part heat-transfer wall which concerns on embodiment of this invention, and each heat recovery apparatus. It is a schematic block diagram for demonstrating the installation method of the rear part heat-transfer wall which concerns on embodiment of this invention, and each heat recovery apparatus. It is a schematic block diagram for demonstrating the installation method of the rear part heat-transfer wall which concerns on embodiment of this invention, and each heat recovery apparatus. It is a partially expanded perspective view of the horizontal heat recovery apparatus according to the embodiment of the present invention. It is a partially expanded perspective view for demonstrating the support structure of the horizontal heat recovery apparatus with respect to the rear part heat-transfer wall which concerns on embodiment of this invention. It is a schematic block diagram of the large boiler equipment for business thermal power generation.

Explanation of symbols

    1: Boiler body, 2: ceiling beam, 3: sling bolt, 4: ceiling, 6: penthouse, 7: furnace room, 8: front side wall room, 9: rear heat transfer wall room, 10: suspended heat transfer tube device, 11: outlet header, 12: front partition, 13: central partition, 14: rear partition, 15: suspension tube, 20a: reheater, 20b: superheater, 20c: evaporator, 20d: economizer, 31 : Jack device, 32: Horizontal heat recovery device, 33: Coil, 34: Spacer, 35: Band, 36: Support rod, 37: Rear heat transfer wall inlet header, 38: End support, 39: Sling wire, 40 : Rough terrain crane, 41: economizer casing, 42: heat transfer tube, 43: support lug, 44: engagement protrusion.

Claims (1)

A process of lowering a lifting wire from a plurality of jack devices installed on a support steel frame of the ceiling, and suspending a rear heat transfer wall at a low position on the wire;
Attaching a heat recovery device in the suspended rear heat transfer wall;
And a step of driving the plurality of jack devices at a constant speed and pulling up and fixing a rear heat transfer wall supporting the heat recovery device to a predetermined position.

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