JP5501941B2 - Tube bundle cutting method and tube bundle cutting device for heat exchanger - Google Patents

Description

  The present invention relates to a tube bundle separating method and a tube bundle cutting device for separating a tube bundle from a tube sheet in a heat exchanger.

  Many thermal exchangers such as feed water heaters, condensers, and economizers are installed in thermal power plants, nuclear power plants, chemical plants, and the like. In these heat exchangers, a large number of metal tubes for heat exchange are usually arranged in a cylindrical or rectangular metal casing as a tube bundle, and the ends of the tube bundle are connected to the tube plate and open, Fluid inflow and outflow portions are provided.

  A tube bundle consists of a large number of metal thin tubes arranged in parallel at a predetermined interval. There are two types of thin tubes, straight tube type and U type. In the case of a straight tube type thin tube, both ends thereof are connected to different tube plates. In the case of a U-shaped thin tube, both ends thereof are connected to a common tube plate, and the folded portion in the middle is free. Furthermore, in any case of a straight tube type thin tube or a U type thin tube, usually, a plurality of intermediate portions of the tube bundle are supported by a supporting plate to maintain the posture of each thin tube and the mutual spacing.

  When the heat exchanger has been used for a long time and has reached the end of its life, it is dismantled. In a general dismantling method, in a portable feed water heater or the like, a heat exchanger is first arranged at a predetermined dismantling position, and after removing a casing covering the outside, the tube bundle is cut and separated near the tube plate. Conventionally, a method of separating a tube bundle in a large heat exchanger, for example, a method in which an operator cuts a thin tube one by one using a cutting tool is employed. However, this method is troublesome, time consuming and inefficient, and has a problem in safety during work.

  On the other hand, Patent Document 1 discloses a cutting device for disassembling a small heat exchanger, for example, a heat exchanger in a home air conditioner. The cutting device of Patent Document 1 is configured to place a tube body with a cover removed from an air conditioner on a table, fix it with a clamp, and cut the tube with a rotary cutting blade that moves in the vertical and horizontal directions. However, this cutting device is a device for cutting a tube of a small heat exchanger, and cannot be used in principle as a cutting device for efficiently separating a tube bundle in a large heat exchanger from a tube plate.

  In addition, a method of cutting a tube bundle of a large heat exchanger using a general cutting device having a rotary cutting blade is also conceivable, but in that case, it is necessary to provide a rotary cutting blade having a large diameter exceeding the outer shape of the tube bundle. There is a problem that the entire apparatus becomes large and expensive.

JP-A-7-265986

  It is an object of the present invention to provide a heat exchanger tube bundle separating method and a tube bundle cutting device capable of efficiently cutting and separating a tube bundle of a large heat exchanger near the tube plate by a small rotary cutting device. And

  The tube bundle cutting method of the heat exchanger according to the present invention is a method of separating a tube bundle of a heat exchanger composed of a plurality of thin tubes in the vicinity of the tube plate. Cut at two places in the longitudinal direction from the outside, and form a gap in the place where the cut capillary section separated by cutting is removed, and insert the rotary cutting device into this gap and leave the remaining portion appearing in the gap The above-described cutting operation, formation of a gap, and removal of the cut thin tube portion are repeatedly performed on the thin tubes, and all the thin tubes coupled to the tube plate are cut to separate the tube bundle from the tube plate.

  The tube bundle cutting method for another heat exchanger according to the present invention is characterized in that a portion to be cut at two locations in the longitudinal direction from the outside of the thin tube is cut from the upper portion to the lower portion of the tube bundle.

  The tube bundle cutting method for another heat exchanger according to the present invention is characterized in that a portion cut in two longitudinal directions from the outside of the thin tube is cut from the lower portion to the upper portion of the tube bundle.

  In another heat exchanger tube bundle separating method according to the present invention, the rotary cutting device is moved laterally in the upper part of the tube bundle to cut the thin tube, and the rotary cutting device is lowered to lower again. The upper portion of the tube bundle is moved laterally to cut the thin tube.

  In another heat exchanger tube bundle separating method according to the present invention, the rotary cutting device is moved up the side portion of the tube bundle to cut the thin tube, and the rotary cutting device is moved laterally again. A side portion of the tube bundle is moved upward to cut the thin tube.

  A tube bundle cutting device for a heat exchanger according to the present invention is a device for separating a tube bundle of a heat exchanger near a tube plate, and a pair of rotary cutting devices installed near the tube plate and facing from the outside to the inside of the tube bundle. And a rotary cutting device driving means for driving the rotary cutting device from the outside to the inside of the tube bundle so as to cut the thin tube by rotating the pair of rotary cutting devices.

  In another heat exchanger tube bundle cutting device according to the present invention, one of the pair of rotary cutting devices is installed in a gate shape above a pair of first elevating supports that can be raised and lowered standing on the side of the tube bundle. The other of the pair of rotary cutting devices is mounted in a gate shape on the upper part of a pair of second elevating and lowering supports that are erected on the side of the tube bundle. It is attached to a member so as to be movable, and a rotary drive device is mounted on each of the pair of rotary cutting devices.

  The tube bundle cutting device for another heat exchanger according to the present invention is characterized in that one rotation direction of the pair of rotation cutting devices is reverse to the other rotation direction.

  In another heat exchanger tube bundle cutting device according to the present invention, the pair of rotary cutting devices have a pair of rotary cutting blades attached in parallel to both ends of the rotary drive means, and the rotary drive means is vertical. It is attached to the rail so as to be movable up and down, and further includes a lateral movement means capable of moving the rotation driving means in the horizontal direction.

  The tube bundle cutting device for another heat exchanger according to the present invention is characterized in that a cut piece receiving portion is attached below the pair of rotary cutting blades.

  In another heat exchanger tube bundle cutting device according to the present invention, two of the tube bundle cutting devices are provided such that one tube bundle cutting device is erected on one side of the tube bundle and the other tube bundle cutting device is opposed to the tube bundle. It is characterized by being erected on the opposite side.

  When a tube bundle consisting of a plurality of thin tubes joined to the tube plate of the heat exchanger is cut off from the tube plate, a gap can be formed at the cut portion by cutting and removing the thin tube at two locations near the tube plate. By repeatedly cutting and removing the thin tubes appearing in the gap, it was possible to separate a large tube bundle from the tube plate using a small rotary cutting device.

The schematic diagram for demonstrating the tube bundle cutting method of the heat exchanger of this invention. The front view which shows the state which has arrange | positioned the tube bundle cutting device of the 1st Embodiment of this invention. The side view of FIG. The enlarged view of the raising / lowering support body shown in FIG. The enlarged front view of a pair of rotation cutting unit shown in FIG. The expansion perspective view of one rotary cutting unit shown in FIG. The figure which shows typically operation | movement of the tube bundle cutting method of the 1st Embodiment of this invention. The figure which shows typically operation | movement of the tube bundle cutting method of the 2nd, 3rd embodiment of this invention. The perspective view of the tube bundle cutting device which concerns on the 2nd Embodiment of this invention. The figure for demonstrating operation | movement of the tube bundle cutting device shown in FIG. The figure which shows the outline | summary of the tube bundle cutting device which concerns on the 3rd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram for explaining the concept of the embodiment of the present invention. First, the heat exchanger to be cut will be described. A heat exchanger 11 shown in FIG. 1 is a large heat exchanger installed in, for example, a thermal power plant, and includes a header 14 having a fluid inflow portion 12 and an outflow portion 13, and a flange on the header 14. And an elongated cylindrical casing 15 that is detachably connected to each other, and an elongated tube bundle 16 disposed inside the casing 15.

  The tube bundle 16 is formed by arranging a large number of thin tubes 17 each having an axis formed in a U shape in a three-dimensional and parallel manner at a predetermined interval, and the open ends of each thin tube 17 are tube plates provided on the header 14. 18 is connected by welding or the like. In addition, the heat exchanger 11 shown in FIG. 1 is provided with support plates 19 that support a plurality of positions in the extending direction (four locations in the illustrated example). These support plates 19 are formed in a disc shape having a size adapted to the inner diameter of the casing 15, and the thin tubes 17 are slidably inserted into a plurality of insertion holes arranged three-dimensionally.

  Although details of the embodiment of the present invention such as the cutting mechanism will be described later, FIG. 3 shows the shape of the tube bundle 16 in which the thin tubes 17 to be cut by the heat exchanger 11 are fixed to the tube plate 18. The front view seen from the right side of is shown. That is, the tube bundle 16 is accumulated in a substantially hexagonal shape.

  Now, referring back to FIG. 1, the first embodiment of the present invention will be described. When the tube bundle 16 is cut off, the casing 15 is first removed, and then the uppermost thin tubes 17 constituting the tube bundle 16 by a rotary cutting device are taken as an example at two locations in the longitudinal direction (interval S) indicated by a one-dot chain line in FIG. Cut two rows and remove this piece. The cutting position of the narrow tube 17 at this time is preferably performed at two locations as close as possible to the tube plate 18 and the support plate 19. That is, by cutting at such a position, vibration of the thin tube at the time of cutting can be prevented.

  In FIG. 1 described above, first, the uppermost two rows of the thin tubes 17 are cut at two places. Next, the cut pieces cut at these two places are removed to form a gap at the place where the cut pieces were present. To do. Similarly, the lower tube bundle 16 appearing in the space is maintained at the position of the interval S, and two rows of the thin tubes 17 are cut at two locations to remove the cut pieces. In this manner, with the spacing S maintained, the upper thin tube is cut, and the lower thin tube fixed to the tube plate 18 appears.

  Similarly, this thin tube is also cut, and in this way, the entire tube bundle 16 composed of the thin tubes 17 fixed to the tube plate 18 is cut from the tube plate 18. Thereafter, by pulling the tube bundle 16 in the direction of the arrow 20 in FIG. 1, the thin tubes 17 can be pulled out in the lateral direction while sliding through the insertion holes of the support plates 19, and the tube bundle 16 can be pulled away from the tube plate 18. Note that specific procedures and mechanisms of the cutting and detaching operations will be described later.

  FIG. 2 is a side view showing a state in which a tube bundle cutting device according to an embodiment of the present invention is arranged at a tube bundle cutting portion of the heat exchanger 11, and FIG. 3 is a front view thereof. In these drawings, a first tube bundle cutting device 21 and a second tube bundle cutting device 22 are each provided with a first elevating support 23 and a second elevating support 24 standing on the side of the tube bundle 16. The first elevating support 23 has a horizontal member 25 attached horizontally between the tops of the pair of elevating supports 29a and 29b. Similarly, the second elevating support 24 is composed of a pair of elevating supports 29c. , 29d is attached with a horizontal member 26 that is connected horizontally. In this way, each of the first and second tube bundle cutting devices 21 and 22 has a gate shape on the pair of elevating supports and the lateral members.

  Rotational cutting units 27 and 28 are attached to the horizontal members 25 and 26, respectively. Then, as shown in FIG. 2, the elevating supports 23 and 24 are stably arranged on the floor of the disassembly site so that the interval between the rotary cutting units 27 and 28 matches the cutting interval S of the tube bundle 16. Further, only the first tube bundle cutting device 21 is shown in FIG. 3, but a second tube bundle cutting device 22 (not shown) is installed on the tube plate 18 side.

  Next, the pair of elevating supports 23 and 24 provided in each of the first and second tube bundle cutting devices 21 and 22 will be described using FIG. 4 in addition to FIGS. FIG. 4 shows only one of the pair of lifting supports, but the other is the same. Each of the elevating supports 23 and 24 is formed in a gate shape, and the pair of elevating columns 29a, 29b and 29c, 29d and the tops of the elevating columns 29a, 29b and 29c, 29d are connected horizontally to each other as described above. Horizontal members 25 and 26 are provided. The lifting columns 29a, 29b and 29c, 29d as a pair are provided with hydraulic or electric drive units, and the heights thereof can be adjusted by the lifting adjustment devices 30a, 30b and 30c, 30d.

  Note that, as necessary, the measuring tapes 31a and 31b and 31c and 31d are attached to the lifting column 29 as height (extension / contraction position) measuring instruments. Rotating and cutting units 27 and 28 that are supported so as to be reciprocally movable along the length direction thereof are mounted on the transverse members 25 and 26, respectively. The raising / lowering operation of the raising / lowering supports 23 and 24 can be performed by the raising / lowering adjustment apparatus 30 shown in FIG. The lifting / lowering adjustment device 30 is provided with a manual rotary handle (not shown). By rotating the rotary handle forward and backward, the lifting / lowering support 29 can be driven to adjust its telescopic position (height). .

  FIG. 5 is an enlarged front view of a main part of the pair of rotary cutting units 27 and 28, and FIG. 6 is an enlarged perspective view of one rotary cutting unit 27. FIG. 6A is a diagram showing the overall configuration of the unit, and FIG. 6B is a side view of a main part extracted and shown. In these drawings, the rotary cutting units 27 and 28 include main bodies 32 and 33, pneumatically driven air motors 34 and 35 provided on the main bodies 32 and 33, and rotary cutting blades (rotation driven by the air motors 34 and 35). (Whetstone) 36, 37 and travel rails 38, 39 provided along the upper surfaces of the transverse members 25, 26 and guide bodies 40, 41 engaged with the travel rails 38, 39, although not shown in FIGS. ing. The guide bodies 40 and 41 are connected to the main bodies 30 and 31, and when the guide bodies 40 and 41 are reciprocated, the main bodies 30 and 31 reciprocate along the traveling rails 38 and 39.

  Covers 42 and 43 are provided between the rotary cutting blades and the air motors 34 and 35 for preventing scattering of the cut pieces. As shown in FIG. 6B, the rotary cutting blade 36 is desirably an offset type, and the upper surface end of the cover 42 is outward from the extended surface of the circumferential end of the rotary cutting blade 36. Arranged so as not to protrude.

  As shown in FIG. 6A, a guide chain 44 is stretched along the rail on the inner bottom surface of the traveling rail 38, and a sprocket (not shown) that is joined to the guide chain 44 is formed inside the guide body 40. A lateral traveling handle 45 that is provided and rotationally drives the sprocket is provided above the guide body 40. Instead of the guide chain 44 and the sprocket, a moving mechanism using a linear guide and a ball screw or an air cylinder may be used.

  Furthermore, the main body 32 is provided with an adjustment handle 46 for adjusting the vertical position of the rotary cutting blade 36. By rotating the adjustment handle 46, the relative position between the main body 32 and the bottom of the rotary cutting blade 36 can be adjusted. The air motor 34 is supplied with air from an air supply source (not shown) via an air supply unit 61.

  In the above example, the rotation directions of the rotary cutting blades 36 and 37 are the same, but they can be reversed. By making reverse rotation, vibration during cutting can be suppressed and cutting can be performed efficiently. Note that the mechanism for reversing the rotation of the rotary cutting blades 36 and 37 can be realized by using a method of changing the polarity of electricity, a method using a bevel gear, a method using a reverse rotation air motor, or the like. Is possible.

  Next, a procedure for separating the tube bundle 16 from the tube plate 18 using the first and second tube bundle cutting devices 21 and 22 will be described. First, as shown in FIG. 2 (FIG. 3), the heat exchanger 11 to be disassembled is arranged on the floor of the dismantling site, the casing 15 is removed, and the first and second tube bundle cutting devices 21 and 22 are illustrated. Thus, it arrange | positions in the predetermined position of the vicinity of the tube sheet 18. FIG. Specifically, the pair of elevating supports 23 and 24 are arranged at predetermined intervals so as to straddle the tube bundle 16 near the tube plate 18 from above, and the cutting interval between the rotary cutting units 27 and 28 becomes the tube bundle cutting interval S. Set to.

Next, the expansion / contraction position of each lifting / lowering support column 29 is adjusted by the lifting / lowering adjusting device 30 shown in FIG. 4, and the positions of the rotary cutting blades 36 and 37 are aligned with the upper surface of the thin tubes 17 constituting the tube bundle 16. Next, the driving device including the air motors 34 and 35 is activated to rotationally drive the rotary cutting blades 36 and 37. In this state, one of the lift adjustment devices 30 is first adjusted to gradually lower the rotary cutting blade 36. The downward adjustment is stopped when the number of thin tubes 17 to be cut at one time (for example, two layers) is reached.

  Next, in this state, the horizontal traveling handle 45 shown in FIG. 6 is rotated, the guide body 40 is rotated, the guide body 40 is gently moved along the guide chain 44, and the thin tubes 17 having the set number of layers are rotated and cut. Cut at 36. Further, the other rotary cutting blade 37 is operated in the same manner to cut the other part of the thin tube 17 having the set number of layers. It is also possible to simultaneously cut the two longitudinal positions of the thin tube 17 by operating both the rotary cutting blades 36 and 37 simultaneously.

  Next, the short cut thin tube portion 17a (see FIG. 5) separated by cutting two longitudinal directions of the thin tube 17 is removed, and the first and second tube bundle cutting devices 21, 22 are formed in the gaps formed thereby. The pair of rotary cutting units 27 and 28 constituting the above are inserted (lowered). That is, the lifting / lowering adjusting devices 30 are adjusted again and lowered until the pair of rotary cutting blades 36 and 37 reach the position of the exposed lower narrow tube 17. Thereafter, all the thin tubes 17 (the entire tube bundle 16) are cut by repeating the above-described cutting operation and the removal operation of the thin tube portion 17a. Next, the separated thin tubes 17 are pulled out from the tube plate 18 sequentially or by pulling the entire tube bundle 16 in the left direction as indicated by an arrow 20 in FIG.

  FIG. 7 schematically shows a main part of the cutting operation in the first embodiment according to the present invention. The thin tubes 17 having a width of the predetermined interval S of the tube bundle 16 are cut in the horizontal direction as indicated by an arrow 47, and the cut thin tube portions 17a indicated by hatching are cut off. When the cutting is completed, the rotary cutting blade 36 is moved downward to perform the same cutting. Although the operator cuts off the cut thin tube portion 17a, the cut thin tube portion 17a sometimes dropped downward.

  FIG. 8 schematically shows the main part of the second embodiment of the present invention. That is, in this example, the tube bundle 16 composed of the thin tubes 17 is cut at a predetermined interval S in the vicinity of the tube plate 18 in the same manner as in the first embodiment described above. However, the difference from the first embodiment shown in FIG. As shown in FIG. 8, the rotary cutting blade 36 is moved from the lower part to the upper part of the tube bundle 16 as indicated by an arrow 48 and cuts at a predetermined interval S.

  By doing in this way, since the thin tube 17 is cut from the lowermost part to the upper part of the tube bundle 16, the cut thin tube part 17a indicated by the oblique lines freely falls downward along with the cutting. Even if the cut capillary tube 17a falls freely, there is no uncut capillary tube below it, so there is no need to remove the cut capillary tube 17a, and the subsequent cutting operation can proceed smoothly.

  FIG. 9 is a perspective view of a tube bundle cutting device 49 according to the second embodiment of the present invention, and FIG. 10 is a diagram for explaining the state of cutting progress by operating the tube bundle cutting device 49. .

  In the tube bundle cutting device 49, a vertical rail 51 and a support column 52 that supports the vertical rail 51 are erected on an upper portion of a support member 50. A cutting drive unit 53 is mounted on the vertical rail 51, and a pair of rotary cutting blades 54 a and 54 b are attached to both ends of the cutting drive unit 53. Although the details are omitted, the cutting drive unit 53 includes a lifting drive unit that moves the rotary cutting blades 54a and 54b up and down along the vertical rail 51, and a rotary drive unit that rotates the rotary cutting blades 54a and 54b. I have. The pair of rotary cutting blades 54a and 54b are configured to rotate in synchronism with a common rotation driving unit. Therefore, the thin tubes of the tube bundle are cut and separated by a single operation as cutting thin tube portions having a predetermined interval S. It is.

  In addition, a bottom plate portion 56 on which a pair of travel linear guides 55a and 55b is laid is provided at the lower portion of the tube bundle cutting device 49. The support member 50 has a structure capable of running in the lateral direction along the pair of running linear guides 55a and 55b by rotating a central ball screw. In the cutting drive unit 53, a cutting piece receiving member 57 is installed particularly under the rotary cutting blades 54a and 54b.

  Fixing members 59 a and 59 b each having an outrigger 58 that can be raised and lowered are provided at both ends of the bottom plate portion 56. When starting the cutting operation, the outriggers 59a and 59b are lowered and the tube bundle cutting device 49 is fixed. The fixing members 59a and 59b are provided with wheels 60, and the tube bundle cutting device 49 can be moved when the outrigger 58 is raised.

  Next, the operation of the above-described tube bundle cutting device 49 will be described with reference to FIG. FIG. 10 shows a state in which the tube bundle cutting device 49 is moved from the right to the left while cutting the tube bundle 16, and the left side shows a state in which the tube bundle cutting device 49 is moved at a chain point. FIG. 10 also shows a state in which the pair of rotary cutting blades 54 a (54 b) are lifted while cutting the tube bundle 16 and moved to the upper part of the vertical rail 51.

  The illustrated size of the tube bundle 16 is different from the relationship with the actual tube bundle cutting device 49 for the sake of explanation. A cutting capillary (not shown) cut by the rotary cutting blades 54a and 54b is cut and freely dropped into the cut piece receiving member 57 and stored.

  The tube bundle cutting device 49 according to this embodiment is different from the configuration and operation shown in FIGS. 1 to 7, but basically, as described in FIG. This is common in that the thin tubes appearing in the formed voids are cut and removed at intervals S.

  However, in this example, since it is possible to cut from the lower part to the upper part of the tube bundle as described above, the cut thin tube part can be stored in the cut piece receiving member 57 by free fall, It is possible to omit the work of removing the cut piece. Further, in this example, it is possible to simultaneously drive the pair of rotary cutting blades 54a and 54b along the common vertical rail 51, thereby improving the accuracy and efficiency of the cutting work. It was possible.

  Next, a third embodiment according to the present invention will be described with reference to FIG. 9 and 10 described above, an example is shown in which one tube bundle cutting device 49 is used to cut the tube bundle 16 from the right to the left. The example shown in FIG. 11 is shown in FIG. As shown by the arrows from the left and right of the tube bundle 16 fixed to the tube plate 18 simultaneously from the lower part to the upper part and from the side part to the center part. Both devices can be driven to perform the tube bundle cutting operation.

  Compared with the apparatus of FIG. 9 and FIG. 10, it is necessary to consider different configurations for details such as a moving mechanism on the floor surface of the apparatus, but there are substantially no differences from the previous example. In this way, it is possible to further improve workability by simultaneously driving the two tube bundle cutting devices 61 and 62 from the left and right.

  DESCRIPTION OF SYMBOLS 11 ... Heat exchanger, 12 ... Outflow part, 13 ... Inflow part, 14 ... Header, 15 ... Casing, 16 ... Tube bundle, 17 ... Thin tube, 17a ... Cutting thin tube part, 18 ... Tube plate, 19 ... Support plate, 20, 47, 48 ... arrows, 21 ... first tube bundle cutting device, 22 ... second tube bundle cutting device, 23 ... first lifting support, 23a, 23b ... first lifting support member, 23c, 23d ... second lifting support member, 24 ... 2nd lifting support body, 25, 26 ... Transverse member, 27, 28 ... Rotation cutting unit, 29a, 29b, 29c, 29d ... Lifting column, 30a, 30b, 30c, 30d ... Lifting adjustment device, 31a, 31b, 31c, 31d ... mold tape measure, 32, 33 ... main body, 34, 35 ... air motor, 36, 37, 54a, 54b ... rotary cutting blade, 38, 39 ... traveling rail, 40, 41 ... guide body, 42, 43 ... Cover, 44 ... 45 ... Horizontal running handle, 46 ... Adjusting handle, 49, 62, 63 ... Tube bundle cutting device, 50 ... Support member, 51 ... Vertical rail, 52 ... Post, 53 ... Cutting drive, 55a, 55b ... For running Linear guide, 56 ... bottom plate part, 57 ... cut piece receiving part, 58 ... outrigger, 59a, 59b ... fixing member, 60 ... wheel, 61 ... air supply part.

Claims (11)

In the method of separating the tube bundle of the heat exchanger composed of a plurality of thin tubes near the tube plate,
A part of a plurality of thin tubes in the vicinity of the tube sheet is cut at two places in the longitudinal direction from the outside by a rotary cutting device, and a gap is formed at a place where the cut thin tubes separated by the cutting are removed. Insert the cutting device and repeat the above cutting operation, formation of the gap, and removal of the cut capillary for the remaining narrow tubes appearing in the gap, cutting all the tubes connected to the tube plate. And separating the tube bundle from the tube sheet.   The method of cutting a tube bundle of a heat exchanger according to claim 1, wherein a portion to be cut at two places in the longitudinal direction from the outside of the thin tube is cut from an upper portion to a lower portion of the tube bundle.   The method of cutting a tube bundle of a heat exchanger according to claim 1, wherein the portion cut at two places in the longitudinal direction from the outside of the thin tube is cut from the lower portion to the upper portion of the tube bundle.   The rotary cutting device is moved horizontally in the upper part of the tube bundle to cut the thin tube, and the rotary cutting device is lowered to move the upper part of the tube bundle in the horizontal direction again to cut the thin tube. The tube bundle separating method for a heat exchanger according to claim 2.   The rotary cutting device is moved up the side portion of the tube bundle to cut the capillary tube, and the rotary cutting device is moved laterally to move the side portion of the tube bundle up again to cut the capillary tube. The tube bundle cutting method for a heat exchanger according to claim 3. In the device for separating the tube bundle of the heat exchanger composed of a plurality of thin tubes near the tube plate,
A pair of rotary cutting devices installed in the vicinity of the tube sheet;
A rotary cutting device driving means for driving the rotary cutting device from the outside to the inside of the tube bundle so as to cut the thin tube by rotating the pair of rotary cutting devices from the outside to the inside of the tube bundle; A tube bundle cutting device for a heat exchanger.   One of the pair of rotary cutting devices is movably attached to a lateral member installed in a gate shape on a pair of up and down first elevating support members that are erected on the side of the tube bundle. The other of the rotary cutting devices is movably attached to a lateral member installed in a gate shape on the upper part of a pair of second elevating supports that can be raised and lowered standing on the side of the tube bundle, and the pair of rotary cutting devices 7. The heat exchanger tube bundle cutting device according to claim 6, wherein a rotation drive device is attached to each of the heat exchanger tubes.   The tube bundle cutting device for a heat exchanger according to claim 6 or 7, wherein one rotation direction of the pair of rotation cutting devices is reverse to the other rotation direction.   The pair of rotary cutting devices has a pair of rotary cutting blades attached in parallel to both ends of the rotary drive means, and the rotary drive means is attached to a vertical rail so as to be movable up and down. 7. The tube bundle cutting device for a heat exchanger according to claim 6, further comprising a lateral movement means capable of moving the drive means in the horizontal direction.   The tube bundle cutting device for a heat exchanger according to claim 9, wherein a cut piece receiving portion is attached below the pair of rotary cutting blades.   The two tube bundle cutting devices according to claim 10, wherein one tube bundle cutting device is erected on one side of the tube bundle and the other tube bundle cutting device is erected on the opposite side of the tube bundle. The heat exchanger tube bundle cutting device according to claim 10, wherein the heat exchanger tube bundle cutting device is a heat exchanger tube bundle cutting device.

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