JP2014129972A - Heat transfer pipe assembly and heat recovery device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat transfer pipe assembly that prevents self excited vibration of heat transfer pipes and a heat recovery device having the same by securely supporting the heat transfer pipes with a simpler structure.SOLUTION: A group of heat transfer pipes includes a plurality of heat transfer pipes 4 arranged substantially parallel with each other with a predetermined interval, each of which extend in the substantially vertical direction and inside which heat medium flows, a plurality of fins disposed on the outer circumferential part of each heat transfer pipe 4, and penetration parts through which the heat transfer pipes 4 having the fins are inserted formed thereon, and a plurality of perforated plates 1 arranged in a substantially horizontal direction. Groups of heat transfer pipes are arranged substantially parallel to each other with a predetermined interval and the perforated plates 1 of adjacent groups of heat transfer pipes are connected to each other by a connection part 7 that defines a relative position between the heat transfer pipes 4 and the perforated plates 1. The connection part 7 has such a length that the fins and the penetration part are in contact.

Description

  The present invention relates to a heat transfer tube assembly suitable for use in, for example, an exhaust heat recovery device of an exhaust gas boiler, and a heat recovery device including the heat transfer tube assembly.

  Conventionally, a combined plant combining a prime mover and an exhaust heat recovery boiler is known for the purpose of heat recovery of high-temperature exhaust gas discharged from a prime mover such as a gas turbine or a diesel engine. Among this type of complex plant, a large number of recently planned and built are exhaust heat recovery combined cycle plants that combine a gas turbine using LNG as a fuel, an exhaust heat recovery boiler, and a steam turbine. . In such a complex plant, high-temperature exhaust gas discharged from a gas turbine or the like is guided to a heat recovery steam generator (HRSG).

  In recent years, an increase in the amount of exhaust gas accompanying an increase in the efficiency of a gas turbine in a combined cycle plant and an increase in exhaust gas temperature require an increase in capacity of the exhaust heat recovery boiler. As the gas turbine becomes larger, the HRSG also becomes larger, so that the conventional vertical HRSG has a limit in the height direction, so the horizontal HRSG has become mainstream.

  The horizontal type HRSG is a suspension type in which the heat transfer tube is suspended from above the duct through which the exhaust gas flows in the horizontal direction. Therefore, the heat transfer tube may vibrate when it receives a gas flow rate faster than a predetermined value. there were. As a document disclosing such a measure, there is the following Patent Document 1.

  In Patent Document 1, a tubular support member in a flat state is inserted into a mutual gap between heat transfer tubes arranged at intervals inside a heat exchanger shell, and the support member is expanded to expand the support member. A support structure for a heat exchanger heat transfer tube is shown in which the surface is pressed against the heat transfer tube to restrain the vibration of the heat transfer tube.

Japanese Utility Model Publication No. 5-96778

  However, in the heat exchanger heat transfer tube support structure disclosed in Patent Document 1, vibration is suppressed by attaching an elastic body between the support structure and the plurality of heat transfer tubes, so that the structure becomes complicated. There was a problem.

  In addition, in the vertical HRSG, the heat transfer tube is inserted laterally like a cantilever from the side wall, so that it can be held in contact with the support point by utilizing the deformation of the heat transfer tube due to its own weight. It was. However, in the horizontal type HRSG, the heat transfer tube is suspended from the upper side to the lower side, and therefore, it cannot be used so that the deformation due to the weight of the heat transfer tube is brought into contact with the support point. For this reason, the horizontal HRSG has a problem that the contact between the heat transfer tube and the porous plate supporting the heat transfer tube becomes unstable.

  As shown in FIG. 8, when the heat transfer tube 101 is not supported by the porous plate 104, a gap 105 is formed between the heat transfer tube 101 and the through portion 103 provided in the porous plate 104 through which the heat transfer tube 101 is inserted. The When this gap 105 is formed, there is a problem that the heat transfer tube 101 vibrates (self-excited vibration) due to poor contact with the porous plate 104. Further, there is a problem that the fin 102 provided on the heat transfer tube 101 is worn like the wear portion 102a by contacting with the through-hole 103 of the perforated plate 104 through which the heat transfer tube 101 is inserted during vibration.

  In order to prevent the self-excited vibration of the heat transfer tube, it is necessary to provide support points that support the heat transfer tube at a predetermined interval, but in order to function as a support point, the fin and the porous plate are loaded with a load higher than a predetermined value. There was the problem of having to keep in touch.

  When the perforated plate does not function as a support point for the heat transfer tube, the natural vibration of the heat transfer tube may change. Moreover, since the frequency changes when calculating the natural frequency of the heat transfer tube, the period of vibration changes. As a result, the natural frequency becomes small, and there is a problem that self-excited vibration of the heat transfer tube is likely to occur even at a low flow rate of the exhaust gas.

  The present invention has been made in view of such circumstances, and includes a heat transfer tube assembly that prevents self-excited vibration of a heat transfer tube by reliably supporting the heat transfer tube with a simpler structure and the heat transfer tube assembly. An object is to provide a heat recovery device.

In order to solve the above problems, the heat transfer tube assembly of the present invention and the heat recovery apparatus including the heat transfer tube assembly employ the following means.
The heat transfer tube assembly of the present invention is arranged substantially in parallel with a predetermined interval, each extending in a substantially vertical direction, and a plurality of heat transfer tubes through which a heat medium flows, and each of the heat transfer tubes A heat transfer tube group including a plurality of fins provided on an outer peripheral portion, and a plurality of perforated plates formed in a substantially horizontal direction and having a through portion through which the heat transfer tube including the fins is inserted. The heat transfer tube groups are arranged substantially parallel to each other with a predetermined interval, and the porous plates of the adjacent heat transfer tube groups define a relative position between the heat transfer tube and the porous plate. The connecting part has a length dimension in which the fin and the penetrating part come into contact with each other.

  The heat transfer tube assemblies are arranged substantially in parallel with predetermined intervals, each extending in a substantially vertical direction, and provided with a plurality of heat transfer tubes in which a heat medium (for example, steam) flows. It has multiple groups. A plurality of fins are provided on the outer periphery of each heat transfer tube. The plurality of heat transfer tube groups are arranged substantially in parallel with each other at a predetermined interval. Moreover, the perforated plates of adjacent heat transfer tube groups are connected by a connecting portion that defines the relative positions of the heat transfer tubes and the perforated plates. The connecting part has a length dimension in which the fin and the penetrating part come into contact with each other. A heat exchanger tube can be supported by the penetration part provided in the perforated panel because a fin and a penetration part contact by a connecting part. Therefore, generation | occurrence | production of the self-excited vibration of a heat exchanger tube can be prevented.

  Further, in the heat transfer tube assembly according to the present invention, the one connecting portion is set to a length dimension in which the connected porous plates approach each other, and is adjacent to the one connecting portion in a substantially vertical direction. The other connecting portion is set to have a length dimension in which the connected porous plates are separated from each other.

  One connecting portion is set to a length dimension that the connected porous plates approach each other, and the other connecting portions adjacent to each other in the substantially vertical direction of the connecting portion are separated from each other of the connected porous plates. The length dimension is set. Compared to the case where the length of one connecting part and the other connecting part are separated from each other by the perforated plates, by setting the one connecting part to a length dimension that allows the perforated plates to approach each other, the force can be reduced. The penetration part provided in the perforated plate and the fin provided in the heat transfer tube can be brought into contact with each other. Thereby, a fin and a penetration part can be made to contact with little load.

  Furthermore, the heat transfer tube assembly according to the present invention is characterized in that an end portion of the connecting portion is fitted and fixed in a mold provided in each of the perforated plates.

  Both ends of the connecting portion are fitted and welded to a mold provided on the perforated plate. Thereby, installation of a connection part can be made easy.

  Furthermore, the heat transfer tube assembly according to the present invention is characterized in that the connecting portion includes a turnbuckle.

  The connecting portion is provided as a turnbuckle. Thereby, it can be adjusted to the target tension by adjusting the turnbuckle while monitoring the load. By adjusting the load while monitoring it, it is possible to prevent rework from occurring. Moreover, you may provide a strain gauge in a turnbuckle.

  A heat recovery apparatus according to the present invention includes the above heat transfer tube assembly.

  By providing the heat transfer tube assembly in a heat recovery device (for example, an exhaust heat recovery device (HRSG) that recovers exhaust heat of the gas turbine and generates steam), poor contact between the heat transfer tube and the porous plate can be prevented. . Therefore, it can be set as the heat recovery apparatus which can prevent the self-excited vibration of a heat exchanger tube.

  According to the present invention, the perforated plates of the adjacent heat transfer tube groups are connected by the connecting portion that defines the relative position between the heat transfer tube and the perforated plate. The connecting part has a length dimension in which the fin and the penetrating part come into contact with each other. A heat exchanger tube can be supported by the penetration part provided in the perforated panel because a fin and a penetration part contact by a connecting part. Therefore, generation | occurrence | production of the self-excited vibration of a heat exchanger tube can be prevented.

It is the perspective view which showed schematic structure of the heat recovery apparatus with which the heat exchanger tube assembly of this invention is applied. It is the side view which showed the heat recovery apparatus with which the heat exchanger tube assembly of this invention is applied. It is the partial detail figure which showed the heat exchanger tube assembly of this invention. It is the side view which showed 1st Embodiment of the heat exchanger tube assembly which concerns on this invention. It is the top view which showed 2nd Embodiment of the heat exchanger tube assembly which concerns on this invention. It is the top view which showed 3rd Embodiment of the heat exchanger tube assembly which concerns on this invention. It is the top view which showed 4th Embodiment of the heat exchanger tube assembly which concerns on this invention. It is the partial detail figure which showed the reference example of the heat exchanger tube assembly which concerns on this invention.

  Hereinafter, an embodiment of a heat transfer tube assembly and a heat recovery apparatus including the heat transfer tube assembly according to the present invention will be described with reference to FIGS.

[First Embodiment]
FIG. 1 has a configuration common to the respective embodiments. In addition, the first embodiment is taken in, and the other embodiments are the same. As shown in FIG. 1, the heat recovery apparatus 10 according to the first embodiment of the present invention is applied to a horizontal HRSG (hereinafter simply referred to as “HRSG”) not shown. In the HRSG, exhaust gas discharged from a gas turbine (not shown) is caused to flow in a horizontal direction (in the direction of arrow a) in a duct, and steam is generated by the heat transfer tubes 4 arranged vertically. The HRSG that constitutes the combined cycle power plant (not shown) is a facility that generates steam using the exhaust heat of the gas turbine and supplies the steam to the steam turbine (not shown).

  The HRSG is arranged in a group in which a plurality of heat transfer tubes 4 are bundled with a metal band or the like inside a casing 2 supported by a steel structure support. Steam or hot water is conducted from a group of heat transfer tubes 4 through a header 5 between a steam drum or a steam turbine (not shown). A plurality of heat transfer tubes 4 are suspended in the casing 2.

  The plurality of heat transfer tubes 4 extend in a substantially vertical direction in the casing 2 and are arranged substantially in parallel with a predetermined interval. A heat medium (for example, steam) is circulated inside the heat transfer tube 4, and a plurality of fins 3 (see FIG. 3) are joined to the outer peripheral portion of the heat transfer tube 4 by welding.

  Similarly, a plurality of perforated plates 1 extending in the horizontal direction with the casing 2 are provided in the casing 2. As shown in FIG. 2, the perforated plate 1 (not shown) has a through portion 6 through which the heat transfer tube 4 including the fins 3 is inserted. The fins 3 provided on the outer peripheral portion of the heat transfer tube 4 are for promoting heat transfer of the heat transfer tube 4. Further, the heat transfer tubes 4 are supported by the fins 3 coming into contact with the through portions 6 of the perforated plate 1.

  As shown in FIG. 3, a group of heat transfer tubes 4 composed of a plurality of heat transfer tubes 4 are arranged substantially in parallel with each other at a predetermined interval, and the porous plates 1 of the group of adjacent heat transfer tubes 4 are connected to each other. The heat transfer tube 4 and the porous plate 1 are connected by a connecting portion 7 that defines the relative position. Moreover, the connection part 7 is made into the length dimension which the fin 3 and the penetration part 6 contact. Moreover, the connection part 7a located in the lower stage of the connection part 7 is set to the length dimension which the mutually connected perforated plates 1 approach, and the connection part 7a adjacent to the substantially perpendicular direction of the connection part 7 connected. The length dimension is set such that the porous plates 1 are separated from each other. The length dimension of the connection part 7 is made shorter than the connection part 7a, for example. Further, the perforated plate 1 is sandwiched and provided by the connecting portion 7. In addition, when installing the connection part 7 in the porous plate 1, the space | interval of the porous plate 1 is adjusted using a jack. The adjustment of the interval is determined according to the relative position between the heat transfer tube 4 and the porous plate 1. For example, when the clearance between the heat transfer tube 4 and the through portion 6 of the porous plate 1 is 4 mm, the connecting portion 7 is fixed in a state where the porous plates 1 are shifted by 4 mm in the approaching direction.

  When the interval between the two porous plates 1 when the porous plates 1 of the group of adjacent heat transfer tubes 4 are not connected by the connecting portion is x [mm], the length of the connecting portion 7 is, for example, x-20 [mm] to x-40 [mm], and the length of the connecting portion 7a is, for example, x + 20 [mm] to x + 40 [mm].

  Further, as shown in FIG. 4, when the length dimension of the connecting portion 7 is shorter than the connecting portion 7 a located at the lower stage, the connecting portion 7 causes the perforated plates 1 to approach each other. It is connected. Moreover, the connection part 7a is provided in the length dimension which spaces apart the porous plates 1 from each other.

Next, the operation of the heat transfer tube assembly configured as described above will be described.
As shown in FIG. 1, the exhaust gas discharged from the gas turbine is caused to flow in the horizontal direction (in the direction of arrow “a”) and comes into contact with the group of heat transfer tubes 4. The heat transfer tube 4 generates steam by utilizing exhaust heat from the exhaust gas. The plurality of perforated plates 1 that support the heat transfer tubes 4 are connected by a connecting portion 7. Since the connecting portion 7 has a length dimension that allows the porous plates 1 to approach each other, as shown in FIG. 4, the porous plates 1 approach each other by pulling the porous plates 1 in the direction of arrow a. Moreover, the force with which the heat exchanger tube 4 is pulled in the direction in which the connection part 7 is installed acts.

  The connecting portion 7a located at the lower stage of the connecting portion 7 is set to a length dimension in which the connected porous plates 1 are separated from each other, and the porous plate 1 is separated in the direction of the arrow b. The connecting portion 7 pulls the perforated plates 1 in the horizontal direction, and the connecting portion 7a acts to compress the perforated plates 1 in the horizontal direction.

According to this embodiment, there exist the following effects.
The perforated plates 1 of the group of adjacent heat transfer tubes 4 are connected by a connecting portion 7 that defines the relative positions of the heat transfer tubes 4 and the perforated plate 1. The connecting portion 7 has a length dimension in which the fin 3 provided in the heat transfer tube 4 and the penetrating portion 6 come into contact with each other. Thereby, the heat transfer tube 4 can be supported by the penetration part 6 provided in the perforated plate 1 by the fin 3 and the penetration part 6 contacting by the connection part 7. Therefore, generation | occurrence | production of the self-excited vibration of the heat exchanger tube 4 can be prevented.

  Compared with the case where the connecting portion 7 and the connecting portion 7a have a length dimension that separates the porous plates 1 from each other, the connecting portion 7 is set to a length that allows the porous plates 1 to approach each other. The penetration part 6 provided in the board 1 and the fin 3 provided in the heat exchanger tube 4 can be made to contact. Thereby, the fin 3 and the penetration part 6 can be contacted with a small load.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a top view showing the heat transfer tube assembly according to the present embodiment. The heat transfer tube assembly shown in this figure has the same overall configuration as the heat transfer tube assembly shown in the first embodiment. Therefore, in the following, the configuration different from the first embodiment will be mainly described. The components common to those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
As shown in FIG. 5, the exhaust gas discharged from the gas turbine flows in the direction of arrow a and contacts the heat transfer tube 4. For example, a solid round bar is used for the connecting portion 7 and the connecting portion 8 of the porous plate 1. Further, a through portion (not shown) through which the connecting portion 7 and the connecting portion 8 provided in the porous plate 1 penetrate is provided. After the connecting portion 8 is connected to the penetrating portion, the connecting portion 8 is welded to the connecting portion 7. Since the perforated plate 1 is not fixed to the connection portion 8 by welding, the porous plate 1 can be slightly moved around the central axis of the connection portion 8, that is, in the direction of the arrow b.

  According to this embodiment, a solid round bar is used for the connecting portion 7 and the connecting portion 8 of the perforated plate 1. Thereby, the connection of the connection part 7 and the porous plate 1 can be made easy. Therefore, the trouble at the time of construction can be reduced. Further, the displacement in the gas flow direction can be allowed by connecting the connecting device and the perforated plate using a solid rod.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a top view showing the heat transfer tube assembly according to the present embodiment. The heat transfer tube assembly shown in this figure has most of the overall configuration in common with the heat transfer tube assembly shown in the above-described other embodiments. Therefore, in the following, the configuration different from the other embodiments will be mainly described. The components common to the other embodiments are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 6, the end of the connecting portion 7 is provided by being fitted into a mold 7 c provided in each porous plate 1 and fixed. After the end portion of the connecting portion 7 is fitted into the mold 7c provided on the porous plate 1, it is welded and fixed. Moreover, since the connection part 7 is welded and fixed to the porous plate 1, the porous plate 1 is also fixed. A mold 7c into which the connecting portion 7 is fitted is provided in the porous plate 1 in advance.

  According to the present embodiment, both ends of the connecting portion 7 are fitted and welded to the mold 7 c provided on the perforated plate 1. Thereby, installation of the connection part 7 can be made easy. Therefore, the trouble at the time of construction can be reduced. Further, the perforated plate 1 is fixed by being fitted into the mold 7c. Since the perforated plate 1 is fixed so as not to move in the front-rear direction, the perforated plate 1 can be stably provided at a predetermined position.

[Fourth Embodiment]
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 7 is a top view showing the heat transfer tube assembly according to the present embodiment. The heat transfer tube assembly shown in this figure has most of the overall configuration in common with the heat transfer tube assembly shown in the above-described other embodiments. Therefore, in the following, the configuration different from the other embodiments will be mainly described. The components common to the other embodiments are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 7, the connecting portion 7b is provided with a turnbuckle (not shown). Further, a strain gauge (not shown) is provided in the connecting portion 7b. The tension of the connecting portion 7b is adjusted by a turnbuckle provided on the connecting portion 7b. In the turnbuckle, for example, screw grooves are formed at both ends of a metal rod-like body. One is a right-hand thread and the other is a left-hand thread (reverse thread). By rotating this cylinder, bolts attached to both ends are tightened (or loosened), and the tension of the connecting portion 7b is adjusted.

  According to this embodiment, the connection part 7b can be adjusted to the target tension by adjusting the turnbuckle provided in the connection part 7b while monitoring the load. By adjusting the load while monitoring it, it is possible to prevent rework from occurring. Moreover, you may provide a strain gauge in a turnbuckle. By providing a strain gauge in the turnbuckle, the turnbuckle can be attached while measuring the load applied to the turnbuckle.

DESCRIPTION OF SYMBOLS 1 Perforated plate 2 Casing 3 Fin 4 Heat transfer tube 5 Header 6 Through part 7 Connection part 7a Connection part 7b Connection part 7c Formwork 8 Connection part 10 Heat recovery apparatus

Claims (5)

A plurality of heat transfer tubes that are arranged substantially in parallel with a predetermined interval, each extending in a substantially vertical direction, and in which a heat medium flows, and
A plurality of fins provided on the outer periphery of each of the heat transfer tubes;
A plurality of perforated plates formed in a substantially horizontal direction with a penetrating portion through which the heat transfer tube including the fins is inserted;
A heat transfer tube group with
The heat transfer tube groups are arranged substantially parallel to each other at a predetermined interval;
The porous plates of the adjacent heat transfer tube groups are connected by a connecting portion that defines a relative position between the heat transfer tube and the porous plate,
The connecting portion has a length dimension in which the fin and the penetrating portion are in contact with each other. The one connecting portion is set to a length dimension that the connected porous plates approach each other,
The said other connection part adjacent to the substantially perpendicular direction of the said one said connection part is set to the length dimension in which the mutually connected said perforated plates are spaced apart from each other. Heat transfer tube assembly.   3. The heat transfer tube assembly according to claim 1, wherein an end portion of the connection portion is fitted and fixed to a mold provided on each of the perforated plates.   The heat transfer tube assembly according to claim 1, wherein the connecting portion includes a turnbuckle.   A heat recovery apparatus comprising the heat transfer tube assembly according to any one of claims 1 to 4.

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