JP2000327259A - Heating tube panel block hoisting method for exhaust heat recovery boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate hoisting of a heating tube panel block and to drastically reduce a work period, by hanging a cordage body about a number of inverse U-shaped tube parts placed in the upper end of the heating tube panel block and locking this cordage body to a hoisting beam. SOLUTION: When a heating tube panel block 4 is hoisted and taken into a casing in an exhaust heat recovery boiler, a cordage body 15 is hung about a number of inverse-U-shaped tube 14 parts placed in the upper end of the heating tube panel block 4. This cordage body 15 is locked to a hoisting beam 8, and the heating tube panel block 4 is hoisted through the hoisting beam 8 using an overhead crane 6. A substantially central part of the cordage body 15 having ring portions 16 at its both ends is hung on the inverse U-shaped tubes 14, a shackle 17 is inserted into the ring portions 16 of the cordage body 15, and in a state where a frame plate portion 18 of the hoisting beam 8 is positioned between both ends of the shackle 17, the cordage body 15 is locked to the hoisting beam 8 using a bolt 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suspending a heat transfer tube panel block of an exhaust heat recovery boiler.

[0002]

2. Description of the Related Art Generally, an exhaust heat recovery boiler includes a superheater, a high-pressure evaporator, a denitration device, and a high-pressure economizer each formed of a heat transfer tube panel block in a rectangular cylindrical casing into which exhaust gas is introduced. , A low-pressure evaporator, a low-pressure economizer, and the like are sequentially arranged in the gas flow direction. However, when the exhaust heat recovery boiler is manufactured, as shown in FIG. At the width end, the side casing 2 is attached so as to stand up, and before the ceiling casing (not shown) is attached to the upper end of the side casing 2 before being assembled, the casing 3 having the upper surface opened is placed in the casing 3. A plurality of heat transfer tube panel blocks 4 divided in the width direction are sequentially installed.

When the heat transfer tube panel block 4 is installed, as shown in FIGS. 6 to 8, a suspension beam 8 is suspended via a wire rope 7 by an overhead crane 6 disposed in a building 5. The lower end of the hanging rod 9 hung from four places around the hanging beam 8 is connected to a hanging piece 11 formed integrally with a gantry 10 below the heat transfer tube panel block 4, and the heat transfer tube panel block 4 is hung. It is moved to a required position in the casing 3.

The length of the heat transfer tube panel block 4 in the gas flow direction and the width in the direction perpendicular thereto are slightly different depending on the type of the superheater, the evaporator, the economizer, and the like. Although the positions are also different, as shown in FIG. 7, the length of the suspension beam 8 in the gas flow direction and the width in the direction perpendicular thereto can be adjusted by changing the tightening positions of the bolts 12 and 13. Thereby, a plurality of types of heat transfer tube panel blocks 4 can be suspended by one suspension beam 8.

[0005]

However, as described above, the suspension beam 8 is suspended by the overhead crane 6 via the wire rope 7, and the lower end of the suspension rod 9 suspended from four places around the suspension beam 8 is attached. In order to suspend the heat transfer tube panel block 4 by connecting it to the hanging piece 11 formed integrally with the gantry 10 below the heat transfer tube panel block 4, the length of the suspension beam 8 in the gas flow direction and the width in the direction perpendicular thereto are reduced. While adjusting according to the type of heat transfer tube panel block 4,
It is necessary to finely adjust the length of the hanging rod 9 hung from four places around the hanging beam 8, which has a drawback that the operation takes a lot of labor and time.

Also, a wire rope 7 by an overhead crane 6
And the hanging point of the gantry 10 below the heat transfer tube panel block 4 by the hanging rod 9 exists at the lower portion, so that the support of the heat transfer tube panel block 4 becomes unstable,
There is also a problem that the sway of the heat transfer tube panel block 4 becomes large.

Further, as shown in FIG. 9, the heat transfer tube panel block 4 is sequentially installed in the width direction orthogonal to the gas flow direction, and after the installation of the last heat transfer tube panel block 4 at that position is completed. Unless at least one of the hanging rods 9 arranged on the upstream side or the downstream side in the gas flowing direction is removed from the hanging beam 8, the overhead crane 6 is moved in the gas flowing direction and other Since the operation cannot be shifted to the operation of installing the next heat transfer tube panel block 4 at the position, the operation efficiency has been deteriorated.

In view of such circumstances, the present invention can obviate the need to adjust the size of the suspension beam in accordance with the type of the heat transfer tube panel block, can greatly reduce the working time, and can reduce the heat transfer tube panel. Stabilize the support of the block,
The heat transfer tube panel block can be restrained from swaying, and the transition to the installation of the next heat transfer tube panel block with respect to another position can be smoothly performed. An object of the present invention is to provide a method of suspending a heat transfer tube panel block.

[0009]

SUMMARY OF THE INVENTION According to the present invention, there is provided an exhaust heat recovery apparatus for suspending a heat transfer tube panel block of an exhaust heat recovery boiler via a suspension beam by a ceiling crane disposed in a building and installing the panel block in a casing. In the method of suspending a heat transfer tube panel block of a recovery boiler, a cable is hung around a number of inverted U-shaped tubes provided at the upper end of the heat transfer tube panel block, and the cable is locked to a suspension beam. Accordingly, the heat transfer tube panel block of the exhaust heat recovery boiler is characterized in that the heat transfer tube panel block is hung from the suspension beam.

In the method for suspending a heat transfer tube panel block of the exhaust heat recovery boiler, it is preferable that the cord is a nylon sleeve wire obtained by covering a wire with a nylon sleeve.

According to the above means, the following effects can be obtained.

[0012] A cable is hung around a number of inverted U-shaped tubes provided at the upper end of the heat transfer tube panel block, and the cable is transferred from the suspension beam by engaging the cable with the suspension beam. At first glance, if the heat tube panel block is suspended, it seems that it takes a long time to hang a rope on a number of inverted U-shaped pipes and lock the rope with the suspension beam. Adjust the length of the hanging beam in the gas flow direction and the width in the direction perpendicular to it in accordance with the type of heat transfer tube panel block, and fine-tune the length of the hanging rod suspended from four places around the hanging beam In practice, it is not necessary to perform this operation, so that the working time can be significantly reduced.

Further, since only the hanging point of the wire rope by the overhead crane exists at the upper part, and the hanging point of the gantry below the heat transfer tube panel block by the hanging rod does not exist at the lower part as in the conventional case, the heat transfer tube is not provided. The support of the panel block is stabilized, and the swing of the heat transfer tube panel block does not increase.

Furthermore, in the conventional case, the heat transfer tube panel blocks are sequentially installed in the width direction orthogonal to the gas flow direction, and after the installation of the last heat transfer tube panel block at that position is completed, the upstream side in the gas flow direction. Unless at least one of the hanging bars arranged on the side or the downstream side is removed from the hanging beam, the overhead crane is moved in the gas flow direction to move the next heat transfer tube panel block to another position. Although it is not possible to shift to the installation work, in the case of the present invention, there is no large-scale component such as a hanging bar, and each cord-like body locked to the hanging beam is removed, and a large number of inverted U-shaped pipes are respectively attached. Since the operation can be shifted to the operation of installing the next heat transfer tube panel block simply by removing the hung rope, the work efficiency is high.

In the method of suspending a heat transfer tube panel block of the exhaust heat recovery boiler, if the cord is made of a nylon sleeve wire in which a wire is covered with a nylon sleeve, the inverted U-shaped tube of the heat transfer tube panel block may be damaged. Absent.

[0016]

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

FIGS. 1 to 4 show an example of an embodiment of the present invention. In the drawings, the portions denoted by the same reference numerals as those in FIGS. 5 to 9 represent the same components. This embodiment is similar to the conventional one shown in FIGS. 5 to 9, but is characterized by a large number of heat transfer tube panel blocks 4 arranged at the upper end as shown in FIGS. 1 to 4. A rope 15 is wrapped around the inverted U-shaped pipe 14 and the rope 15 is suspended
In that the heat transfer tube panel block 4 is suspended from the suspension beam 8.

As shown in FIG. 4, each of the inverted U-shaped pipes 14 is wound around a substantially central portion of a cord 15 having ring portions 16 formed at both ends thereof. Through the shackle 17, between the two ends of the shackle 17,
In a state where the frame plate portion 18 of the suspension beam 8 is located,
A hole 20 formed at both ends of the shackle 17 for inserting a bolt 19 and a hole 2 formed in the frame plate portion 18 of the suspension beam 8.
1 and the bolt 19 is inserted through the suspension beam 8.
The cord 15 is locked with respect to.

As the cord 15, a nylon sleeve wire obtained by coating a wire with a nylon sleeve is used.

Next, the operation of the illustrated example will be described.

At the time of installing the heat transfer tube panel block 4 in the casing 3, the cable-like members 15 are wound around the many inverted U-shaped tubes 14 provided at the upper end of the heat transfer tube panel block 4. A shackle 17 is passed through the ring portion 16 of the cord 15, and
In a state where the frame plate portion 18 of the suspension beam 8 is located,
A hole 20 formed at both ends of the shackle 17 for inserting a bolt 19 and a hole 2 formed in the frame plate portion 18 of the suspension beam 8.
1, and the cord 15 is locked to the suspension beam 8. Thereafter, the overhead crane 6 is lifted, and the heat transfer tube panel block 4 is suspended from the suspension beam 8, and the inside of the casing 3 is removed. To the required position.

As described above, the rope 15 is wrapped around the multiple inverted U-shaped pipes 14 provided at the upper end of the heat transfer tube panel block 4, and the rope 15 is engaged with the suspension beam 8. When the heat transfer tube panel block 4 is suspended from the suspension beam 8 by stopping, the rope 15 is wrapped around a large number of inverted U-shaped tubes 14 at first glance, and the rope 15 is attached to the suspension beam. Although it is likely that it will take a long time to perform the operation of locking the suspension beam 8, the length of the suspension beam 8 in the gas flow direction and the width in the direction perpendicular thereto are adjusted according to the type of the heat transfer tube panel block 4, as in the related art. Since it is not necessary to finely adjust the length of the hanging rod 9 hung from four places around the hanging beam 8, the working time can be greatly reduced in practice.

The wire rope 7 by the overhead crane 6
There is only a hanging point at the top, as before,
Since the hanging point of the gantry 10 below the heat transfer tube panel block 4 by the hanging rod 9 does not exist below, the heat transfer tube panel block 4
Of the heat transfer tube panel block 4 does not become large.

Further, in the conventional case, as shown in FIG. 9, the heat transfer tube panel blocks 4 are sequentially installed in the width direction orthogonal to the gas flow direction, and the last heat transfer tube panel block 4 is installed at that position. After the completion, the overhead traveling crane 6 is moved in the gas flow direction unless at least one of the two suspension rods 9 provided on the upstream side or the downstream side in the gas flow direction is removed from the suspension beam 8. Although the operation cannot be shifted to the operation of installing the next heat transfer tube panel block 4 to another position, in the case of the illustrated example, there is no large-scale component such as the hanging rod 9 and each shackle 1
7 is removed, and the ring portion 16 of the cord 15 is removed.
Is removed from the shackle 17 and the rope-shaped members 15 respectively hung around the many inverted U-shaped tubes 14 can be removed, so that the operation can be shifted to the operation of installing the next heat transfer tube panel block 4, so that the work efficiency is good.

On the other hand, since a nylon sleeve wire obtained by covering the wire with a nylon sleeve is used as the cord 15, there is no risk of damaging the inverted U-tube 14 of the heat transfer tube panel block 4.

In this way, it is not necessary to adjust the size of the suspension beam 8 in accordance with the type of the heat transfer tube panel block 4, so that the working time can be greatly reduced and the support of the heat transfer tube panel block 4 can be stabilized. The heat transfer tube panel block 4 can be restrained from swaying, and the transition to the installation of the next heat transfer tube panel block 4 to another position can be smoothly performed, thereby improving work efficiency. obtain.

The method of suspending the heat transfer tube panel block of the exhaust heat recovery boiler of the present invention is not limited to the above-described example, and various changes can be made without departing from the gist of the present invention. Of course.

[0028]

As described above, according to the method for suspending a heat transfer tube panel block of an exhaust heat recovery boiler of the present invention, the size of a suspension beam is adjusted according to the type of a heat transfer tube panel block. It can be unnecessary, can greatly reduce the working time, stabilize the support of the heat transfer tube panel block, can suppress the swing of the heat transfer tube panel block, and further, the next heat transfer tube panel block with respect to another position Can be smoothly performed, and an excellent effect of improving work efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view of an example of an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is a perspective view showing how to hang an inverted U-shaped tube in an example of an embodiment of the present invention.

FIG. 5 is a schematic perspective view showing a heat transfer tube panel block installed in a casing of the heat recovery steam generator.

FIG. 6 is a side view showing an example of a conventional method for suspending a heat transfer tube panel block of an exhaust heat recovery boiler.

FIG. 7 is a view taken along the line VII-VII in FIG. 6;

8 is a view taken in the direction of arrows VIII-VIII in FIG. 6;

FIG. 9 is a schematic plan view showing a heat transfer tube panel block installed in a casing of the heat recovery steam generator.

[Explanation of symbols]

 Reference Signs List 3 casing 4 heat transfer tube panel block 5 building 6 overhead crane 8 suspension beam 14 inverted U-shaped tube 15 cord

Claims (2)

[Claims] 1. A heat transfer pipe panel block of an exhaust heat recovery boiler for suspending a heat transfer pipe panel block of an exhaust heat recovery boiler via a suspension beam and installing the heat transfer pipe panel block in a casing by an overhead crane disposed in a building. In the construction method, a number of inverted U provided at the upper end of the heat transfer tube panel block
A heat recovery steam generator is characterized in that a heat transfer pipe panel block is suspended from a suspension beam by hanging a rope on a portion of a pipe and locking the rope on a suspension beam. Heat transfer tube panel block suspension method. 2. The method for suspending a heat transfer tube panel block of an exhaust heat recovery boiler according to claim 1, wherein the cord is a nylon sleeve wire obtained by covering the wire with a nylon sleeve.