JP6846007B2 - Heating tube vibration prevention jig - Google Patents

Description

The present invention relates to a jig for fixing the heating tube, and more particularly to a heating tube vibration prevention jig installed to suppress vibration of the heating tube.

The heat pipe type heating pipe used as a heat exchanger of a desulfurization apparatus _{contains sulfur oxides such as SO 2 in} the exhaust gas, so that ammonium sulfate is generated by reacting with water. Since this ammonium sulfate corrodes the metal of the heating tube, the thickness of the heating tube is reduced.

In addition, due to aged deterioration, the gas flow rate increases and the gas flow velocity increases, causing the heating tube to vibrate.
Therefore, metal fatigue due to vibration is added to the fragile heating tube, and the heating tube is damaged.
If the heating pipe is damaged, the power plant will be shut down, repairs will be required, and a large amount of repair costs will be required.

In order to prevent damage to the heating pipe due to such vibration, vibration prevention plates are provided at both ends of the heat radiating portion (heat pipe) and in the middle thereof to alleviate the vibration.
Specifically, a vibration prevention plate is provided above the heat pipe into which a large number of fins are inserted, a partition plate is provided below the heat pipe, and the vibration prevention plate and the partition plate are fixed by bolts and nuts. However, Patent Document 1 discloses an electrically insulated heat pipe type cooler in which a new vibration prevention plate is provided between the vibration prevention plate and the partition plate.

Jikkenhei 7-018453

Here, in the electrically insulated heat pipe type cooler of Patent Document 1, a new vibration prevention plate provided between the vibration prevention plate and the partition plate is provided on the outside of the fin. Therefore, the new vibration prevention plate is formed with a heat pipe insertion hole formed to be larger than the outer peripheral diameter of the fin.
Therefore, in order to maintain the strength of the new vibration prevention plate, it is necessary to secure a considerable width with respect to the radial direction of the heat pipe insertion hole.

However, in a device in which the space between the heat pipes is set very narrow, a new vibration prevention plate is formed larger in the radial direction of the heat pipe insertion hole as described above, so that new vibrations occur. There is a problem that the prevention plate and the heat pipe cannot be provided due to interference.

Further, the vibration prevention plate, the new vibration prevention plate, and the partition plate of Patent Document 1 all have low rigidity in the axial direction of the heat pipe because they are not thick in the axial direction, and vibration generated in this direction. There is also a problem that cannot be suppressed.

The present invention has been made in view of the above circumstances, and even in a device designed with a narrow interval between heating pipes (between heat pipes), at least vibration generated in the axial direction of the heating pipes is suppressed, and metal fatigue of the heating pipes is suppressed. The main issue is to provide a heating pipe vibration prevention jig that prevents damage due to the above.

In order to achieve the above object, the heating tube vibration prevention jig according to the present invention is a jig for preventing the vibration of a plurality of heating tubes, and is attached to the side surface of the heating tubes so as to sandwich the plurality of heating tubes. A pair of fixing plates and a plurality of fixing tools for fixing the pair of fixing plates to the plurality of heating tubes are provided, and the fixing tool is composed of a bolt and a nut screwed onto the bolt. The bolts are fixed to the one fixing plate, and the pair of fixing plates are formed in the shape of a long plate so that the lateral direction is parallel to the axial direction of the heating tube when attached to the heating tube. The other fixing plate is formed with a slit notched from the lower end to the upper side along the axial direction of the heating pipe so that the bolt can be inserted into the other fixing plate. It is characterized by having an extension portion extending along the insertion direction of the bolt.

By fixing the side surfaces of the heating tube with the fixture, the pair of fixing plates can suppress the vibration of the heating tube. Further, by forming a slit notched upward from the lower end in the axial direction of the heating tube, one fixing plate is held in close contact with the side surface of the heating tube, and the other fixing plate is slid from the upper side. The bolt can be easily inserted into the slit simply by moving it downward. Therefore, even in a device designed with a narrow interval between heating tubes, it is possible to easily attach a heating tube vibration prevention jig.

Further, the pair of fixing plates, since have a extending portion which extends along the insertion direction of the bolt, it is possible to increase the rigidity in the direction perpendicular to the axial direction of the heating tube, It is possible to suppress not only the vibration of the heating tube in the axial direction but also the vibration in the vertical direction in this direction.

The pair of fixing plates are attached to each unit composed of a plurality of heating tubes arranged in a row, and the units are arranged in a row at predetermined intervals in a direction perpendicular to the arrangement direction of the heating tubes. The extending portion of the fixing plate may be provided at the lower end edge of the one fixing plate and at the upper end edge of the other fixing plate.
If the extension portion formed on one fixing plate is formed on the upper side in the axial direction of the heating pipe, the other fixing plate is used when the heating pipe vibration prevention jig is attached to the next adjacent unit. When inserting a bolt into the slit of, the extension part formed on this fixing plate and the extension part formed on one plate interfere with each other, and the other fixing plate is placed on the lower side in the axial direction of the heating pipe. The bolt cannot be inserted into the slit even if it is moved so as to slide.
Therefore, by forming the extension portion in this way, it is possible to prevent the extension portion formed on one or the other fixing plate from interfering with the extension portion of the other fixing plate facing each other between the units. it can.

The extending portions facing each other between the adjacent units may be provided so as to be offset in the vertical direction of the heating pipe.
By forming the extension portion in this way, it is possible to prevent the extension portions of the fixing plates facing each other between the adjacent units from interfering with each other.

As described above, according to the heating tube vibration prevention jig of the present invention, the pair of fixing plates fix the side surfaces of the heating tube with a fixture, so that the width between the heating tubes is designed to be narrow. , It is possible to suppress the vibration of the heating tube, and it is possible to prevent the heating tube from being damaged due to metal fatigue. This makes it possible to prevent the power plant from shutting down due to damage to the heating pipe.

FIG. 1 is a perspective view showing the entire heating tube vibration prevention jig according to the first embodiment. FIG. 2 is an enlarged perspective view showing a state in which the heating tube vibration prevention jig according to the first embodiment is attached to the heating tube. FIG. 3 is a front view showing a state in which the heating pipe vibration prevention jig according to the first embodiment is attached to the heating pipe. FIG. 4 is a perspective view showing the entire heating tube vibration prevention jig according to the second embodiment. FIG. 5 is a perspective view showing a state in which the heating tube vibration prevention jig according to the second embodiment is attached to the heating tube.

Hereinafter, the heating tube vibration prevention jig 1 according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the heating tube vibration prevention jig 1 includes a pair of fixing plates 2a and 2b and a pair of fixing plates 2a, which are attached to the side surfaces of the heating tube 4 so as to sandwich the plurality of heating tubes 4. It is configured to include two fixtures 3 for fixing 2b to a plurality of heating tubes 4.

The heating tube 4 is used for a heat exchanger of a flue gas desulfurization apparatus of a boiler. In the heat exchanger, the medium is hot water, and the heat of the exhaust gas is recovered by heat exchange between the exhaust gas of the boiler and the medium. It is a thing.
Further, 3 or 4 heating tubes 4 are arranged in a row to form one unit 5.
A plurality of the units 5 are arranged in a row at intervals of about 50 mm in the direction perpendicular to the arrangement direction of the heating tubes 4.

Each heating tube 4 communicates with both the header 6a arranged on the upper side in the axial direction and the header 6b arranged on the lower side in the axial direction, and fins 7 are provided in the middle thereof. There is.
The distance between the heating tubes 4 in one unit 5 is about 95 mm.

The fixture 3 is composed of a bolt 31 and a nut 32 screwed onto the bolt 31.
The pair of fixing plates 2a and 2b are formed in the shape of a long plate, and when attached to the heating tube 4, the pair of fixing plates 2a and 2b are arranged so that the lateral direction is parallel to the axial direction of the heating tube 4.
Further, the longitudinal direction of the fixing plates 2a and 2b has a length capable of covering the entire heating tube 4 in at least one unit 5.

The bolt 31 of the fixture 3 is fixed to one of the fixing plates 2a by welding.
When the screw portion 33 on which the screw of the bolt 31 is formed is arranged so as to face the pair of fixing plates 2a and 2b, the screw portion 33 is directed from the inside of one fixing plate 2a toward the inside of the other fixing plate 2b. It is formed to face.

The other fixing plate 2b is provided with two slits 21 formed so that the screwed portion 33 of the bolt 31 can be inserted.
The slit 21 is formed by notching upward from the lower end of the heating tube 4 in the axial direction. The width of the slit 21 is formed to be larger than the diameter of the screwed portion 33 of the bolt 31 and narrower than the outer diameter of the nut 32 of the fixture 3.

A method of attaching the heating tube vibration prevention jig 1 described above to the heating tube 4 will be described.
First, the nut 32 is attached to the bolt 31 so that the nut 32 is loosened.
One fixing plate 2a is inserted between the units 5 while tilting so that the bolt 31 does not interfere, and one fixing plate is held so as to be located between the lower header 6b and the fin 7.
The other fixing plate 2b is inserted between the other units 5 so as to sandwich the heating tube 4, and is moved so as to slide downward to insert the bolt 31 into the slit 21.
By tightening the nut 32 with a ratchet, the pair of fixing plates 2a and 2b are fixed to the heating tube 4 with the fixture 3.

In this embodiment, the heating tube vibration prevention jig 1 fixes one unit 5 (3 or 4 heating tubes 4), but two adjacent units 5 (6 or 8 heating tubes). It is also possible to fix 4).

Further, since the vicinity of the connection portion with the lower header 6b is particularly susceptible to vibration, it is attached between the lower header and the fin 7, but further, between the upper header 6a and the fin 7. It can also be attached to.

Further, although the nut 32 is attached to the bolt 31 before the bolt 31 is inserted into the slit 21, the nut 32 may be attached after the bolt 31 is inserted into the slit 21.
Furthermore, two or more slits 21 may be formed, and the number of bolts 31 may be appropriately increased accordingly.

As described above, according to the heating tube vibration prevention jig 1 of the present invention, the pair of fixing plates 2a and 2b fix the side surfaces of the heating tube 4 with the fixture 3 so that the side surface of the heating tube 4 is fixed in the axial direction of the heating tube 4. It is possible to suppress the vibration generated by the heating tube 4 and prevent the heating tube 4 from being damaged due to metal fatigue. This makes it possible to prevent the power plant from stopping due to damage to the heating pipe 4.

Further, since the slit 21 is formed by notching upward from the lower end surface of the heating tube 4 in the axial direction, one fixing plate 2a is held in close contact with the side surface of the heating tube 4, and the other fixing plate 2b is held. The bolt 31 can be easily inserted into the slit 21 even in a place where the width between the heating tubes 4 is designed to be narrow by simply moving the bolt 31 downward so as to slide it from the upper side.

The heating tube vibration prevention jig 1 of the first embodiment suppresses the vibration in the axial direction (flow path direction) of the heating tube 4, but further suppresses the vibration in the direction perpendicular to the axial direction of the heating tube 4. It may be configured as follows. The same configurations as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Specifically, as shown in FIGS. 4 and 5, the pair of fixing plates 2a and 2b face outward with respect to the respective mounting directions and are extended along the insertion direction of the bolt 31. It has a part 22.

The extension portion 22 is formed integrally with the fixing plates 2a and 2b.
The extending portions 22 facing each other between the adjacent units 5 are provided so as to be offset in the vertical direction of the heating pipe 4.
That is, between the units 5, the adjacent extension portions 22 are formed at parallel positions (positions where the two adjacent extension portions 22 between the units 5 overlap each other without interfering with each other).

In this embodiment, one fixing plate 2a has an extension portion 22 at the lower end edge of the heating tube 4 in the axial direction, and the other fixing plate 2b has an extension portion 22 at the upper end edge of the heating tube 4 in the axial direction. It is formed.

In this embodiment, when the heating pipe vibration prevention jig 1 is attached, it is attached from the unit 5 provided at the innermost part on the side where the other fixing plate 2b is arranged.
By performing the mounting work in this way, when the other fixing plate 2b is slid and the bolt 31 is inserted into the slit 21, the extending portion 22 of one fixing plate 2a of the adjacent unit 5 interferes. Can be prevented.

As described above, by forming the extending portion 22 on the pair of fixing plates 2a and 2b, it is possible to increase the rigidity in the direction perpendicular to the axial direction of the heating tube 4, and it is possible to increase the rigidity in the axial direction of the heating tube 4. Not only the vibration but also the vibration in the vertical direction in this direction can be suppressed. Further, since the extension portion 22 is formed at the end portion in the axial direction, it is possible to prevent the extension portions 22 of the adjacent fixing plates 2a and 2b from interfering with each other.
Therefore, even in an apparatus designed so that the intervals between the heating tubes 4 are narrow, vibration in both the axial direction and the vertical direction of the heating tubes 4 can be suppressed.

In this embodiment, the extension portion is formed at the axial end of the heating pipe 4, but the extension portion is not limited to this and is formed at a position parallel to the adjacent extension portion. If it is, the position can be freely set and implemented.

1 Heating pipe vibration prevention jig 2a One fixing plate 2b The other fixing plate 21 Slit 22 Extension 3 Fixing tool 31 Bolt 32 Nut 4 Heating pipe

Claims (3)

A jig that prevents vibration of multiple heating tubes.
A pair of fixing plates attached to the side surfaces of the heating tubes so as to sandwich the plurality of heating tubes, and a plurality of fixtures for fixing the pair of fixing plates to the plurality of heating tubes are provided.
The fixture consists of a bolt and a nut that is screwed onto the bolt.
The bolt is fixed to the one fixing plate and
The pair of fixing plates are formed in the shape of a long plate, and are arranged so that the lateral direction is parallel to the axial direction of the heating tube when attached to the heating tube.
The other fixing plate is formed with a slit notched from the lower end to the upper side along the axial direction of the heating pipe so that the bolt can be inserted .
Further, the pair of fixing plates is a heating tube vibration prevention jig characterized by having an extending portion extending along the insertion direction of the bolt. The pair of fixing plates are attached to each unit composed of a plurality of heating tubes arranged in a row.
A plurality of the units are arranged in a row at predetermined intervals in the direction perpendicular to the arrangement direction of the heating tubes.
The heating tube vibration prevention jig according to claim 1 , wherein the extending portion of the fixing plate is provided at the lower end edge of the one fixing plate and at the upper end edge of the other fixing plate. Ingredients. The heating tube vibration prevention jig according to claim 2 , wherein the extending portions facing each other between the adjacent units are provided so as to be offset in the vertical direction of the heating tube.

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