JP7325955B2 - Heat transfer tube panel manufacturing method and heat transfer tube panel assembly device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a heat transfer tube panel, which is a component of a heat exchanger, and a heat transfer tube panel assembling apparatus used for the method.

2. Description of the Related Art Conventionally, there has been known a heat exchanger that includes a heat transfer tube installed in a flow path of a high temperature gas and exchanges heat between a heat medium flowing inside the heat transfer tube and the high temperature gas. For example, Patent Literature 1 discloses this type of heat exchanger.

As shown in FIG. 14, the boiler described in Patent Document 1 is configured such that hot gas from a combustion chamber 11 flows through a radiant chamber 12 into a flue 13. , a three-stage superheater 16 (heat exchanger) is installed. As shown in FIG. 15 , the superheater 16 includes upper and lower common pipes 28 and a plurality of heat transfer tube modules 26 connected to the common pipes 28 via connecting pipes 27 . The heat transfer tube module 26 includes a header 19 (collection tube) and a plurality of heat transfer tube panels 20 connected to the header 19 . The heat transfer tube panel 20 is composed of a plurality of rows of heat transfer tubes 21 meandering in a plane.

WO2015/186207

A heat transfer tube panel 20 shown in FIG. 15 is formed by combining a plurality of meandering heat transfer tubes 21 (serpentine tubes) in a nested manner and binding them with a binding member. Since the heat transfer pipes 21 are not straight pipes, a crane has been adopted as a means of transportation when combining the heat transfer pipes 21 .

The heat transfer tube 21 is heavy and large, and is easily deformed by twisting or straining. When transporting the heat transfer tubes 21 using a crane, the crane must be clamped at appropriate positions on the heat transfer tubes 21 in order to suspend the heat transfer tubes 21 in a balanced manner. is time-consuming. Furthermore, in order to avoid interference between the heat transfer tubes 21 suspended by the crane and the surroundings, it is necessary to operate the crane with great care. In other words, the work of transporting the heat transfer tubes 21 using a crane is a complicated work. Therefore, if the process of transporting the heat transfer tubes 21 by a crane can be omitted in the process of assembling the heat transfer tube panel 20, work efficiency can be improved.

The present invention has been made in view of the above circumstances, and its object is to propose a heat transfer tube panel manufacturing method with improved working efficiency and a heat transfer tube panel assembling apparatus used therefor.

A heat transfer tube panel assembling apparatus according to one aspect of the present invention is an assembling apparatus for a heat transfer tube panel including a plurality of rows of heat transfer tubes meandering in a plane,
at least two movable conveyors arranged in parallel and movable between a transport position capable of transporting the heat transfer tubes and a retracted position retracted from the transport position so as not to interfere with the heat transfer tubes;
A support provided between the movable conveyors arranged side by side and provided with a plurality of support portions for supporting the heat transfer tube members; an assembly jig having a lifting device that lifts and lowers the support in a range up to a second level in which all the support parts are equal to or higher than the conveying level of the movable conveyor ;
The support body has a plurality of support portions with height differences, and the height levels of the support portions corresponding to the heat transfer tubes are different.

Further, a method for manufacturing a heat transfer tube panel according to an aspect of the present invention is a method for manufacturing a heat transfer tube panel composed of N rows (N is an integer of 2 or more) meandering heat transfer tubes in a plane,
Repeating the following a) to e) from 1 to N,
a) Lowering the support having support portions with different height levels in N steps from the first support portion to the N-th support portion in order from the bottom until it reaches below the conveying level of the movable conveyor;
b) moving the movable conveyor from a retracted position to a transport position;
c) moving the nth row heat transfer tubes onto the movable conveyor at the transfer position;
d) for transferring the n-th heat transfer tube from the movable conveyor to the n-th support portion of the support corresponding to the n-th heat transfer tube, the heat transfer tube already supported by the support is raising the support while remaining below the transport level until the n-th support reaches above the transport level;
e) moving the movable conveyor from the transport position to the retracted position to horizontally retract the movable conveyor from the n-th heat transfer tube;
raising the support until all heat transfer tubes supported by the support are above the transport level;
moving the movable conveyor from the retracted position to the transport position; and
lowering the support to below the transport level to transfer all the heat transfer tubes from the support to the movable conveyor.

According to the heat transfer tube panel assembling apparatus and the heat transfer tube panel manufacturing method, a plurality of heat transfer tubes can be nested together without using a crane. Therefore, compared to the case where a crane is used to combine a plurality of heat transfer tubes, the work time is shortened and the work is less difficult, so that the work efficiency can be improved as a whole.

In the heat transfer tube panel assembling apparatus, the support has a plurality of steps with height differences, the heat transfer tube members in the same row are at the same height level, and the heat transfer tube members in different rows are at the same height level. The plurality of steps may be provided with the support portion so that there is a difference in height between the steps.

Further, in the heat transfer tube panel assembling apparatus, the support portion may be formed with a recess into which the heat transfer tube is fitted.

According to the present invention, it is possible to propose a heat transfer tube panel manufacturing method with improved work efficiency and a heat transfer tube panel assembly apparatus used therefor.

FIG. 1 is a diagram showing an example of a heat transfer tube panel. FIG. 2 is a plan view showing the configuration of a heat transfer tube panel assembling apparatus according to one embodiment of the present invention. FIG. 3 is a view of the assembly jig in FIG. 2 viewed from the Y direction. FIG. 4 is a flow chart showing the flow of the process of combining the heat transfer tubes. FIG. 5 is a partial side view of the heat transfer tube panel assembling apparatus showing how the first row heat transfer tubes are carried onto the movable conveyor. FIG. 6 is a partial side view of the heat transfer tube panel assembling apparatus showing how the first row heat transfer tubes are transferred from the movable conveyor to the support. FIG. 7 is a plan view of the heat-transfer-tube panel assembling apparatus showing a state in which the movable conveyor has moved to the retracted position. FIG. 8 is a partial side view of the heat-transfer-tube panel assembling apparatus showing how the second-row heat-transfer tubes are carried onto the movable conveyor. FIG. 9 is a partial side view of the heat-conducting-tube panel assembling apparatus showing how the second-row heat-conducting tubes are transferred to the support. FIG. 10 is a partial side view of the heat transfer tube panel assembling apparatus showing how the third row heat transfer tubes are carried onto the movable conveyor. FIG. 11 is a plan view of the heat-transfer-tube panel assembling apparatus showing how heat-transfer tubes in all rows are supported by supports. FIG. 12 is a partial side view of the heat-transfer-tube panel assembling apparatus showing how heat-transfer tubes in all rows are supported by supports. FIG. 13 is a partial side view of a heat transfer tube panel assembling apparatus showing how a plurality of combined heat transfer tubes are transferred from a support to a movable conveyor. FIG. 14 is a diagram showing a boiler equipped with a superheater according to background art. 15 is a diagram showing a heat transfer tube module included in the superheater of FIG. 14. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of the heat transfer tube panel 20. As shown in FIG. The heat transfer tube panel 20 shown in FIG. 1 is utilized, for example, as a component of the superheater 16 of the boiler 10 as illustrated in FIG. However, the heat transfer tube panel 20 is not limited to the superheater 16, and can be widely applied to heat exchangers.

The heat transfer tube panel 20 includes a plurality of rows of heat transfer tubes 21 and a binding member 22 that binds the heat transfer tubes 21 . The heat transfer tube 21 is a meandering tube that meanders in a plane. The serpentine tube has at least two parallel straight tube sections and a bend tube section connecting the ends of the straight tube sections. Here, a meandering pipe having three or more parallel straight pipe portions will be described as an example, but the present invention is not limited to this, and a meandering pipe having two parallel straight pipe portions (i.e., U tube) can also be applied. Further, in the present embodiment, the number of rows of the heat transfer tubes 21 constituting the heat transfer tube panel 20 is three, but the number of rows of the heat transfer tubes 21 may be two or more. The three rows of heat transfer tubes 21 are combined in a nested manner. That is, these heat transfer tubes 21 are combined so that the second heat transfer tube 21B is placed inside the first heat transfer tube 21A and the third heat transfer tube 21C is placed inside the second heat transfer tube 21B in order from the outside.

[Heat transfer tube panel assembly device 3]
The heat transfer tube panel assembling apparatus 3 according to this embodiment is used to assemble the heat transfer tube panel 20 configured as described above. FIG. 2 is a plan view showing the configuration of a heat transfer tube panel assembly device 3 according to an embodiment of the present invention, and FIG. 3 is a view of the assembly jig 4 in FIG. 2 viewed from the Y direction.

As shown in FIG. 2 , the heat transfer tube panel assembly device 3 includes a carry-in conveyor 31 , a movable conveyor 32 connected to the end of the carry-in conveyor 31 , and an assembly jig 4 . The heat transfer tube panel assembly device 3 may further include an unloading conveyor 33 connected to the end of the movable conveyor 32 .

The carry-in conveyor 31 includes at least two carry-in conveyors 31 arranged in parallel in the Y direction. The carry-in conveyor 31 is a roller conveyor, and the structure of the roller conveyor is well known, so a detailed description thereof will be omitted. The heat transfer tubes 21 are stretched over the two carry-in conveyors 31 in a posture in which the straight tube portion extends in the Y direction. The heat transfer tubes 21 supported by the carry-in conveyor 31 are movable in the X direction. The X direction is a horizontal direction, and the Y direction is a horizontal direction perpendicular to the Y direction.

The movable conveyors 32 include at least two movable conveyors 32 arranged in parallel in the Y direction. The movable conveyor 32 is movable between a "conveyance position P1" connected to the end of the carry-in conveyor 31 and a "retraction position P2" shifted in the Y direction from the conveyance position P1. For this purpose, the movable conveyor 32 has wheels (not shown) running on rails 35 laid on the floor. The movable conveyor 32 at the retracted position P2 is out of the trajectory of movement of the heat transfer tubes 21 and the heat transfer tube panel 20 so as not to interfere with their movement in the X direction.

As shown in FIG. 3 , the assembly jig 4 has a support 41 and a lifting device 42 for lifting the support 41 . A plurality of supports 41 are arranged side by side in the Y direction as shown in FIG. 2 so as to support the heat transfer tubes 21 in a well-balanced manner.

The support body 41 has a plurality of steps provided with a stepwise difference in height. The number of levels of steps is equal to the number of rows of heat transfer tubes 21 included in the heat transfer tube panel 20 . The number of supports 41 provided in the assembly jig 4 , the number of steps formed in the supports 41 , the arrangement of the support portions 40 , and the like are appropriately adjusted according to the configuration of the heat transfer tube panel 20 .

One heat transfer tube 21 is supported by a support portion 40 provided on the same level step of the support 41 . The support portion 40 may be a semicircular recess formed in a step. As a result, the heat transfer tubes 21 are supported by the support portion 40 in a state where they are fitted in the recesses, so that the heat transfer tubes 21 can be prevented from being displaced on the support 41 as the support 41 moves up and down. can improve the quality of

Since each support 41 shown in FIG. 3 supports three heat transfer tubes 21, there are two steps of three different levels. A step on the first stage from the bottom is provided with a first support portion 40A for supporting the first row heat transfer tubes 21A. The second step from the bottom is provided with a second support portion 40B for supporting the second row heat transfer tubes 21B. The third step from the bottom is provided with a third support portion 40C for supporting the third row heat transfer tubes 21C. The positions of the support portions 40 provided on the support body 41 are nested in plan view in a state in which each heat transfer tube 21 is supported by the corresponding support portion 40 (that is, the heat transfer tube in the heat transfer tube panel 20 21).

These supports 41 are collectively supported by a lifting device 42 . The lifting device 42 moves from a first level L<b>1 (see FIG. 5 ) where the entire support 41 is lower than the conveying level of the movable conveyor 32 , to a position where all the support parts 40 of the support 41 are above the conveying level of the movable conveyor 32 . The support 41 can be raised and lowered within a range up to the second level L2 (see FIG. 6). Although the lifting device 42 of this embodiment is a jack, the lifting device 42 is not limited to this as long as the support body 41 can be moved up and down.

[Manufacturing method of heat transfer tube panel 20]
Next, a method for manufacturing the heat transfer tube panel 20 will be described. The manufacturing process of the heat transfer tube panel 20 includes a process of nesting a plurality of heat transfer tubes 21 and a process of binding the plurality of heat transfer tubes 21 . However, the step of bundling the plurality of heat transfer tubes 21 is not essential.

A heat-conducting-tube panel assembling apparatus 3 is used in the process of combining a plurality of heat-conducting tubes 21 in the manufacturing process of the heat-conducting-tube panel 20 . The process of combining a plurality of heat transfer tubes 21 using the heat transfer tube panel assembly device 3 will be described in detail below. FIG. 4 is a flow chart showing the flow of the process of combining the heat transfer tubes 21. As shown in FIG.

As shown in FIG. 4, the support 41 descends until it reaches below the conveying level of the movable conveyor 32 (step S1). At this time, the entire support 41 is at the first level L<b>1 lower than the conveying level of the movable conveyor 32 . The conveying level of the movable conveyor 32 refers to the height level of the conveying surface of the movable conveyor 32 .

Next, the movable conveyor 32 moves from the retracted position P2 to the transport position P1 (step S2), and the first row heat transfer tubes 21A move onto the movable conveyor 32 that has moved to the transport position P1 (step S3). Here, as shown in FIG. 2, the first row heat transfer tubes 21A on the carry-in conveyor 31 move in the X direction and reach above the movable conveyor 32. As shown in FIG. The heat transfer tubes 21 on the carry-in conveyor 31 and the movable conveyor 32 can be manually moved in the X direction by an operator by rotating the free rollers.

As shown in FIG. 5, the first row heat transfer tubes 21A on the movable conveyor 32 are positioned such that the straight tube portion of the first row heat transfer tubes 21A and the first support portion 40A of the support 41 are aligned vertically.

Subsequently, the support 41 is raised until the first heat transfer tube 21A is transferred from the movable conveyor 32 to the first support 40A of the support 41 (step S4). Here, as shown in FIG. 6, the support 41 rises until the first support portion 40A of the support 41 associated with the first heat transfer tube 21A reaches above the conveying level of the movable conveyor 32. . As the support body 41 rises in this manner, the first row heat transfer tube 21A is lifted from the conveying surface of the movable conveyor 32 and transferred to the support body 41 .

Subsequently, as shown in FIG. 7, the movable conveyor 32 moves from the first row heat transfer tubes 21A to the retracted position P2 in the Y direction (step S5). Here, the movable conveyor 32 at the retracted position P2 is retracted in the Y direction from all the heat transfer tubes 21 supported by the supports 41 .

Next, steps S1 to S5 are performed for the second row heat transfer tubes 21B. Here, as shown in FIG. 8, when the second row heat transfer tubes 21B move onto the movable conveyor 32 in step S3, the support 41 and the first row heat transfer tubes 21A are below the conveying level of the movable conveyor 32. Therefore, the movement of the second row heat transfer tubes 21B in the X direction is not hindered. Further, the second row heat transfer tubes 21B on the movable conveyor 32 are positioned so that the straight tube portions thereof are located above the corresponding second support portions 40B.

Further, as shown in FIG. 9, in step S4, when the support 41 is raised, the first row heat transfer tubes 21A already supported by the support 41 are maintained below the rollers of the movable conveyor 32, The support 41 rises so that only the second support 40B provided above the first support 40A reaches above the conveying level of the movable conveyor 32 . Thereby, interference between the first row heat transfer tubes 21A and the movable conveyor 32 is avoided.

Subsequently, steps S1 to S5 are performed for the third row heat transfer tubes 21C. Here, as shown in FIG. 10, in step S3, when the third heat transfer tube 21C moves onto the movable conveyor 32, the support 41, the first heat transfer tube 21A, and the second heat transfer tube 21B move along the movable conveyor 32. , the movement of the third row heat transfer tubes 21C in the X direction is not hindered. Also, the third row heat transfer tubes 21C on the movable conveyor 32 are positioned so that the straight tube portions thereof are located above the corresponding third support portions 40C.

Further, in step S4, when the support 41 is raised, the first row heat transfer tubes 21A and the second row heat transfer tubes 21B already supported by the support 41 are maintained below the rollers of the movable conveyor 32, The support body 41 rises so that only the third support part 40C provided above the first support part 40A and the second support part 40B reaches above the conveying level of the movable conveyor 32 . This avoids interference between the first heat transfer tube 21A and the second heat transfer tube 21B and the movable conveyor 32 .

After completing step S5 for the third-row heat transfer tubes 21C, the first to third-row heat transfer tubes 21A, 21B, and 21C are supported by the support member 41 as shown in FIG. In the present embodiment, the heat transfer tubes 21 located outside are supported by the supports 41 in order. It is supported by the support 41 .

Subsequently, as shown in FIG. 12, the support 41 is raised until all the heat transfer tubes 21A, 21B, and 21C are above the conveying level of the movable conveyor 32 (step S7). Further, the movable conveyor 32 moves from the retracted position P2 to the transport position P1 (step S8).

Finally, as shown in FIG. 13, the support 41 is lowered until the entire support 41 is below the conveying level of the movable conveyor 32 (step S9). As a result, the first to third row heat transfer tubes 21A, 21B, and 21C are transferred from the support 41 to the movable conveyor 32. As shown in FIG. The first to third row heat transfer tubes 21A, 21B, 21C are nested together. A plurality of combined heat transfer tubes 21A, 21B, 21C are bound and integrated as a heat transfer tube panel 20. As shown in FIG. The heat transfer tube panel 20 may be transferred from the movable conveyor 32 onto the unloading conveyor 33 and unloaded by the unloading conveyor 33, for example.

In the above description, each work of moving the heat transfer tube 21, operating the lifting device 42 for lifting and lowering the support 41, and moving the movable conveyor 32 is performed by an operator. However, these operations may be performed automatically. In this case, an automatic transfer conveyor is adopted as the carry-in conveyor 31 and the movable conveyor 32, a hydraulic or electric cylinder is adopted as the lifting device 42, a motor for driving the wheels is mounted on the movable conveyor 32, and these are controlled by a controller. controlled by

As described above, the method for manufacturing the heat transfer tube panel 20 according to the present embodiment is a method for manufacturing the heat transfer tube panel 20 composed of the heat transfer tubes 21 meandering in a plane of N rows (N is an integer of 2 or more). The following a) to e) are repeated from 1 to N (n is an integer), and all the heat transfer tubes 21 supported by the support 41 reach above the conveying level of the movable conveyor 32. , the movable conveyor 32 moves from the retracted position P2 to the transport position P1, and all the heat transfer tubes 21 are transferred from the support 41 to the movable conveyor 32. 41 is lowered to below the transport level.
a) lowering of the support 41 until it is below the conveying level of the movable conveyor 32;
b) moving the movable conveyor 32 from the retracted position P2 to the transport position P1;
c) moving the n-th heat transfer tube 21 onto the movable conveyor 32 at the transport position P1;
d) the heat transfer tubes 21 already supported by the support 41 to transfer the n-th heat transfer tube 21 from the movable conveyor 32 to the n-th support 40 associated with the n-th heat transfer tube 21 of the support 41; below the transport level, the support 41 rises until the n-th support 40 reaches above the transport level;
e) The movable conveyor 32 moves from the transfer position P1 to the retraction position P2 in order to retract the movable conveyor 32 from the n-th heat transfer tube 21 in the horizontal direction.

Further, the heat transfer tube panel assembly device 3 according to this embodiment includes at least two movable conveyors 32 arranged in parallel and an assembly jig 4 . The movable conveyor 32 is movable between a transport position P1 in which the heat transfer tubes 21 can be transported and a retracted position P2 in which the heat transfer tubes 21 are retracted from the transport position P1 so as not to interfere with the heat transfer tubes 21 . The assembly jig 4 is arranged between the movable conveyors 32 arranged side by side. It has a lifting device 42 that lifts and lowers the support 41 in a range from a first level L<b>1 lower than the level to a second level L<b>2 where all the support parts 40 are above the conveying level of the movable conveyor 32 .

According to the method for manufacturing the heat-conducting tube panel 20 and the heat-conducting tube panel assembling apparatus 3, a plurality of heat-conducting tubes 21 can be nested together without using a crane. Therefore, compared to the case where a crane is used to assemble a plurality of heat transfer tubes 21, the working time is shortened and the difficulty of the work is reduced, so that the working efficiency can be improved as a whole.

The support 41 of the heat transfer tube panel assembling apparatus 3 has a plurality of support parts 40 with different heights, and the height level of the support part 40 corresponding to each heat transfer tube 21 is different.

Since the support portions 40 are provided with a difference in height in this manner, the heat transfer tubes 21 are supported in order from the support portions 40 located below, so that the heat transfer tubes 21 already supported by the supports 41 are A new heat transfer tube 21 can be supported by the support 41 without interfering with the heat transfer tube 21 .

3: heat transfer tube panel assembly device 4: assembly jig 10: boiler 11: combustion chamber 12: radiation chamber 13: flue 16: superheater 19: header 20: heat transfer tube panels 21, 21A, 21B, 21C: heat transfer tube 22 : Bundling member 26 : Heat transfer tube module 27 : Connecting pipe 28 : Common pipe 31 : Carry-in conveyor 32 : Movable conveyor 33 : Carry-out conveyor 35 : Rail 40 : Support part 41 : Support body 42 : Lifting device

Claims (3)

An apparatus for assembling a heat transfer tube panel comprising multiple rows of heat transfer tubes meandering in a plane,
at least two movable conveyors arranged in parallel and movable between a transport position capable of transporting the heat transfer tubes and a retracted position retracted from the transport position so as not to interfere with the heat transfer tubes;
A support provided between the movable conveyors arranged side by side and provided with a plurality of support parts for supporting the heat transfer tubes; an assembly jig having an elevating device for elevating the support in a range up to a second level in which the support part is equal to or higher than the conveying level of the movable conveyor ;
The support body has a plurality of the support parts with height differences, and the height level of the support parts corresponding to each heat transfer tube is different.
Heat transfer tube panel assembly equipment. A recessed portion in which the heat transfer tube is fitted is formed in the support portion,
The heat transfer tube panel assembling apparatus according to claim 1. A method for manufacturing a heat transfer tube panel consisting of N rows (N is an integer of 2 or more) meandering heat transfer tubes in a plane,
Repeating the following a) to e) from 1 to N,
a) Lowering the support having support portions with different height levels in N steps from the first support portion to the N-th support portion in order from the bottom until it reaches below the conveying level of the movable conveyor;
b) moving the movable conveyor from a retracted position to a transport position;
c) moving the nth row heat transfer tubes onto the movable conveyor at the transfer position;
d) for transferring the n-th heat transfer tube from the movable conveyor to the n-th support portion of the support corresponding to the n-th heat transfer tube, the heat transfer tube already supported by the support is raising the support while remaining below the transport level until the n-th support is above the transport level;
e) moving the movable conveyor from the transport position to the retracted position to horizontally retract the movable conveyor from the n-th heat transfer tube;
raising the support until all heat transfer tubes supported by the support are above the transport level;
moving the movable conveyor from the retracted position to the transport position; and
lowering the support to below the conveying level to transfer all the heat transfer tubes from the support to the movable conveyor;
A method for manufacturing a heat transfer tube panel.

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