JP2019100690A - Exhaust heat recovery boiler and supporting method - Google Patents

Abstract

To perform a positive supporting of a load of a heat transfer pipe even if exhaust gas temperature shows high temperature while installation or replacement of the heat transfer pipe is being facilitated.SOLUTION: There are provided several heat transfer pipes arranged inside of a duct to cause fluid heat exchanged with exhaust gas to be flowed into inside of the duct; an upper header connected to the several heat transfer pipes and extending in a horizontal direction crossing with a flowing direction of exhaust gas; a cylindrical communication pipe 50 extending from the upper header in a vertical upward direction to pass through the duct and fluid flows inside of it; and a supporting mechanism 60 for supporting the communication pipe 50 at vertical upper part of the duct. The communication pipe 50 has ribs 51 at predetermined vertical upper positions of the duct that protrude outwardly from an outer peripheral surface. The supporting mechanism 60 provides an exhaust heat recovery boiler comprising clamp members 61, 62 for holding an outer peripheral surface of the communication pipe 50 at a vertical lower part of the predetermined position and at the same time extending in an X direction at a horizontal plane; and a pair of supporting beams 63, 64 for supporting lower surfaces of both ends of the clamp members 61, 62 in their X directions.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an exhaust heat recovery boiler including a plurality of heat transfer tubes and a support method for supporting loads of the plurality of heat transfer tubes.

In an exhaust heat recovery boiler (HRSG), exhaust gas discharged from a gas turbine or the like passes through a duct, and heat is exchanged between the exhaust gas and water or steam in a heat transfer pipe to generate steam. Inside the duct of the exhaust heat recovery boiler, a large number of heat transfer pipes through which water and steam flow are disposed (see, for example, Patent Document 1).
Patent Document 1 discloses that both ends of a heat transfer tube are penetrated through a boiler ceiling wall and fixed to a crown suspended from a support beam.

Japanese Patent Application Laid-Open No. 10-89610

However, according to Patent Document 1, both ends of the heat transfer tube need to be penetrated through the boiler ceiling wall to connect them, and complicated work is required for installation and replacement of the heat transfer tube.
Also, conventionally, a heat transfer tube may be supported using a metal (for example, stainless steel) suspension rod from a support beam located vertically above the boiler ceiling wall, but the heat transfer tube is circulated to the inlet of the heat recovery steam generator. Exhaust gas temperature increases (for example, 650 ° C or higher), the strength of the suspension rod supporting the heat transfer tube near the inlet of the waste heat recovery boiler may decrease, which may make it difficult to support the heat transfer tube. is there.

  The present invention has been made in view of such circumstances, and it is possible to reliably support the load of the heat transfer tube even when the temperature of the exhaust gas becomes high while facilitating the installation and replacement of the heat transfer tube. An object is to provide a recovery boiler and a support method.

In order to solve the above-mentioned subject, the present invention adopts the following means.
A waste heat recovery boiler according to one aspect of the present invention includes: a duct into which exhaust gas is introduced; a plurality of heat transfer pipes disposed inside the duct for circulating a fluid which exchanges heat with the exhaust gas; and the plurality of heat transfer pipes A vertically extending header connected to the plurality of heat transfer pipes vertically above and extending in the horizontal direction intersecting the flow direction of the exhaust gas; and connected to the header and extending vertically upward from the header to penetrate the duct and the fluid flowing inside And a support mechanism for supporting the communication pipe vertically above the duct, wherein the communication pipe has a projection projecting outward from the outer peripheral surface at a predetermined position vertically above the duct The support mechanism clamps the outer peripheral surface of the connection pipe vertically below the predetermined position and extends in a first direction of a horizontal surface, and lower surfaces of both ends of the pair of clamp units in the first direction. Support And a support portion of the pair.

  According to the waste heat recovery boiler of one aspect of the present invention, the connecting pipe extends vertically upward from the header connected to the plurality of heat transfer pipes and penetrates the duct, and the predetermined position vertically above the duct of the connecting pipe The projection projects outward from the outer peripheral surface. A holding portion holding the outer peripheral surface is attached vertically below the predetermined position of the connection pipe, and the load of the plurality of heat transfer pipes is transmitted to the holding portion through the projection of the connection pipe. The loads of the plurality of heat transfer tubes transmitted to the sandwiching portion are transmitted to the pair of support portions from the lower surfaces of both end portions in the first direction of the horizontal plane in which the sandwiching portion extends. Since the connecting tube cooled by the fluid flowing inside is used instead of the conventional hanging rod, the reduction in strength can be suppressed to support the load of the plurality of heat transfer tubes. Since the plurality of heat transfer tubes are disposed inside the duct without penetrating the duct, the heat transfer tubes can be easily installed and replaced. In addition, since the load of the plurality of heat transfer tubes is supported by the support mechanism vertically above the duct where the exhaust gas does not flow, the load of the heat transfer tube can be reliably supported even if the exhaust gas temperature becomes high.

In the exhaust heat recovery boiler according to one aspect of the present invention, the support mechanism restricts movement of one end of the sandwiching portion in a second direction relative to a horizontal plane orthogonal to the first direction; It is good also as composition provided with a pair of 2nd control members which control movement to the 2nd direction of the other end of the pinching part.
According to this configuration, the movement of the one end and the other end of the holding portion in the second direction of the horizontal surface can be restricted.

In the exhaust heat recovery boiler of the above configuration, the header is a metal member formed in a cylindrical shape extending in the second direction, and the header is provided with a pair of the connection pipes at an interval in the second direction. The pair of first restriction members are arranged at a predetermined interval in the second direction, and the pair of second restriction members are arranged at the predetermined interval in the second direction. It may be in the form.
Since the header is a tubular member formed in a cylindrical shape extending in the second direction, when high temperature exhaust gas is introduced into the duct, the length in the second direction of the header becomes longer due to heat expansion and is connected to the header The arrangement interval of the pair of connecting pipes in the second direction is increased. Since the pair of first restricting members and the pair of second restricting members are disposed at a predetermined interval in the second direction, the heat expansion of the header does not cause stress at the connection position of the pair of connection pipes and the header .

In the exhaust heat recovery boiler of the above aspect, the support mechanism is a pair of metal materials disposed between the sandwiching portion and the pair of support portions and having a surface roughness smaller than the upper surface of the pair of support portions. A plate-like member may be provided.
By doing so, when the sandwiching part is moved in the second direction by an external force such as heat extension of the header or an earthquake, the movement of the pair of sandwiching parts is smoothly performed.

In the exhaust heat recovery boiler having the above configuration, the support mechanism may include a pair of third regulating members that regulate movement in the first direction at one end and the other end of the sandwiching portion.
In this way, when external force in the first direction is applied to the plurality of heat transfer pipes due to an earthquake or the like, the sandwiching portion can be appropriately prevented from moving in the first direction.

  A supporting method according to an aspect of the present invention is a supporting method for supporting a load of a plurality of heat transfer pipes provided in a waste heat recovery boiler, wherein the waste heat recovery boiler includes: a duct into which exhaust gas is introduced; A plurality of heat transfer tubes disposed internally for circulating a fluid that exchanges heat with exhaust gas, and a header extending vertically connected to the plurality of heat transfer pipes vertically above the plurality of heat transfer pipes and intersecting the flow direction of the exhaust gas And a cylindrical connecting pipe connected to the header, extending vertically upward from the header and penetrating the duct and circulating the fluid therein, and at a predetermined position vertically above the duct, the connecting pipe A step of joining the projection projecting outward to the outer peripheral surface, a step of attaching the holding portion extending in the first direction of the horizontal plane vertically below the predetermined position, and holding the outer peripheral surface of the connection pipe; Said And a step for supporting the lower surface of the opposite end portions a pair of support portions, the.

  According to the supporting method according to one aspect of the present invention, the projection projecting outward from the outer peripheral surface is joined at a predetermined position vertically above the duct of the communication pipe, and the outer peripheral surface is clamped vertically below the predetermined position of the communication pipe The load of the plurality of heat transfer tubes is transmitted to the sandwiching portion through the projection. The loads of the plurality of heat transfer tubes transmitted to the sandwiching portion are transmitted to the pair of support portions from the lower surfaces of both end portions in the first direction of the horizontal plane in which the sandwiching portion extends. Since the connecting tube cooled by the fluid flowing inside is used instead of the conventional hanging rod, the reduction in strength can be suppressed to support the load of the plurality of heat transfer tubes. Since the plurality of heat transfer tubes are disposed inside the duct without penetrating the duct, the heat transfer tubes can be easily installed and replaced. In addition, since the load of the plurality of heat transfer tubes is supported by the support mechanism vertically above the duct where the exhaust gas does not flow, the load of the heat transfer tube can be reliably supported even if the exhaust gas temperature becomes high.

  According to the present invention, it is possible to provide a waste heat recovery boiler and a supporting method capable of reliably supporting the load of the heat transfer tube while facilitating the installation and replacement of the heat transfer tube, even if the exhaust gas temperature rises.

It is a longitudinal section showing an exhaust heat recovery boiler concerning a 1st embodiment. It is the elements on larger scale which show I part of FIG. It is a perspective view which shows the heat exchanger tube of FIG. 2, an upper header, a lower header, and a connection pipe. It is a perspective view which shows the connection pipe and support mechanism of FIG. It is II-II arrow sectional drawing of the connection pipe and support mechanism of FIG. FIG. 5 is a cross-sectional view taken along the line II-II of the connection pipe and the support mechanism of FIG. 4, in which the solid line shows the state before introducing the exhaust gas, and the broken line shows the state after introducing the exhaust gas. It is III-III arrow sectional drawing of the support mechanism shown in FIG. It is a perspective view which shows the connection pipe and support mechanism of the exhaust heat recovery boiler which concern on 2nd Embodiment.

First Embodiment
Hereinafter, a waste heat recovery boiler according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, in the exhaust heat recovery boiler of the present embodiment, high temperature (for example, 650 ° C. or higher) combustion exhaust gas (hereinafter referred to as exhaust gas) discharged from a gas turbine (not shown) flows in the horizontal direction. It is a horizontal exhaust heat recovery boiler. In the present embodiment, the exhaust gas flow direction is horizontal, the direction orthogonal to this is the vertical direction, and the longitudinal direction of the heat transfer tube 20 is the vertical direction. FIG. 2 is a partially enlarged view showing a portion I of FIG. FIG. 3 is a perspective view showing the heat transfer tube 20, the upper header 30, the lower header 40, and the connection tube 50 of FIG.
In the embodiment described below, the upper side indicates the upper side in the vertical direction, and the lower side indicates the lower side in the vertical direction.

  As shown in FIGS. 1 and 2, the exhaust heat recovery boiler 100 according to the present embodiment includes a duct 10, a plurality of heat transfer pipes 20, an upper header 30, a lower header 40, a connecting pipe 50, and a support mechanism. 60, a denitration device 70, and a steam drum 80.

  The duct 10 is a cylindrical body extending in the horizontal direction while the exhaust gas is introduced. Exhaust gas discharged from a gas turbine or the like flows in from the inflow port 11 and flows inside the duct 10, and flows out from the outflow port 12 and is led to a chimney (not shown). Inside the duct 10, a plurality of heat transfer pipes 20, an upper header 30, a lower header 40, and a denitration device 70 are accommodated.

The heat transfer pipe 20 is a pipe body which is disposed inside the duct 10 and allows the steam and the feed water (fluid) in heat exchange with the exhaust gas to flow therethrough. As shown in FIGS. 2 and 3, the upper portions of the plurality of heat transfer tubes 20 arranged along the vertical direction are connected to the upper header 30, and the lower portions of the plurality of heat transfer tubes 20 are connected to the lower header 40 There is.
In FIG. 1, the heat transfer tubes 20 collectively represent a plurality of heat transfer tubes 20 and also schematically show the number of the heat transfer tubes 20 installed in FIGS. 2 and 3. There is.

The upper header 30 is connected to the plurality of heat transfer tubes 20 above the plurality of heat transfer tubes 20 and extends in the horizontal direction orthogonal to (crosses with) the flow direction of the exhaust gas and made of metal (for example, high chromium steel or stainless steel) It is a state body.
The lower header 40 is connected to the plurality of heat transfer tubes 20 below the plurality of heat transfer tubes 20 and extends in the horizontal direction orthogonal to (crosses with) the flow direction of the exhaust gas. It is a state body.

The communication tube 50 is a cylindrical body connected to the upper header 30 and extending upward from the upper header 30 along the vertical axis Z. The connecting pipe 50 extends upward through the upper portion of the duct 10 and is connected to the steam drum 80 at the upper end.
As shown in FIG. 3, the upper header 30 is connected with a pair of connecting pipes 50 at an interval D1 along the direction in which the upper header 30 extends (Y direction (second direction in FIG. 5 described later)). There is.

  As shown in the perspective view of FIG. 4, the communication pipe 50 includes a plurality of ribs (protrusions) 51 projecting outward from the outer peripheral surface at a position (predetermined position) where the support mechanism 60 above the duct 10 is disposed. . The connection pipe 50 and the rib 51 are made of, for example, high chromium steel or stainless steel.

  The ribs 51 are joined by welding, for example, at a plurality of places (for example, 4 places at 90 degree intervals) at equal intervals in the circumferential direction around the axis Z, for example. Necessary load can be supported according to the weight of the connecting pipe 50, the upper header 30, the lower header 40, and the plurality of heat transfer pipes 20 depending on the number and arrangement of the ribs 51 and the pipe spacing and size (length, width and thickness) It is desirable to set appropriately. By expanding the selection range of the number and the size of the ribs 51, it is possible to easily secure the welding length with the ribs 51 so as to support the load required for the connecting pipe 50.

  The support mechanism 60 is a mechanism for supporting the load of the plurality of heat transfer tubes 20 connected to the connection tube 50, the upper header 30, and the lower header 40 by supporting the connection tube 50 above the duct 10. As shown in FIG. 2, the support mechanism 60 is installed on the upper surface of the frame 90 fixed to the ground surface.

Next, the support mechanism 60 will be described in detail with reference to FIGS. 4 and 5.
4 is a perspective view showing the connection pipe 50 and the support mechanism 60 of FIG. 2, and FIG. 5 is a cross-sectional view of the connection pipe 50 and the support mechanism 60 of FIG.

  As shown in FIG. 4, the support mechanism 60 includes clamp members (sandwich portions) 61 and 62, a pair of support beams (support portions) 63 and 64, a pair of first regulating members 65, and a pair of second restraints. A member 66, a pair of third restricting members 67, and a pair of slide plates (plate-like members) 68 are provided. In the present embodiment, the clamp member 61 and the clamp member 62 are formed by a pair of clamp members 61 and 62 having the same shape, and the parts are shared.

  The pair of clamp members 61 and 62 are members that sandwich the outer peripheral surface of the connection pipe 50 below the position where the rib 51 is joined to the connection pipe 50 and extend in the X direction (first direction) of the horizontal surface. Here, the X direction coincides with the flow direction of the exhaust gas in the duct 10 in the present embodiment. The pair of clamp members 61 and 62 are, for example, bent so as to be able to sandwich the communication tube 50 in a plate-like member, and a rib plate is welded to the bent portion to secure strength. The structure is not limited as long as it holds, and any similar commercial product may be used. For example, the pair of clamp members 61 and 62 do not necessarily have to be sandwiched by the same members having the same shape. For example, even if one of the clamp members 61 or 62 has a shorter length in the X direction than the other, It can be configured. The pair of clamp members 61 and 62 clamps the outer peripheral surface of the communication pipe 50 by fastening the fastener 61 a consisting of a bolt and a nut while sandwiching the communication pipe 50. Loads of the connecting pipe 50, the upper header 30, the lower header 40, and the plurality of heat transfer pipes 20 are transmitted to the upper surfaces of the pair of clamp members 61 and 62 via the ribs 51.

  The pair of clamp members 61 and 62 and the ribs 51 are formed of a metal material (for example, high chromium steel or stainless steel). When the temperature of the exhaust gas introduced into the duct 10 of the present embodiment is 650 ° C. to 700 ° C., the temperature of the steam flowing through the connecting pipe 50 in the vicinity of the support mechanism 60 is approximately 600 ° C. In this case, the pair of clamp members 61 and 62 and the ribs 51 may be formed of a metal material having a heat resistant temperature of 550 ° C. to 600 ° C., and selection from ordinary high temperature metal materials becomes possible. The heat-resistant temperature is sufficiently lower than the temperature of the exhaust gas introduced into the duct 10. That is because the pair of clamp members 61 and 62 and the rib 51 are disposed outside the duct 10 and are cooled by the outside air.

  The support beam 63 is a member for supporting the lower surface of one end of the pair of clamp members 61 and 62 in the X direction, and the support beam 64 is a member for supporting the lower surface of the other end of the pair of clamp members 61 and 62 in the X direction. . The pair of support beams 63 and 64 are attached and fixed to a frame 90 fixed to the ground surface.

The pair of first restriction members 65 is a plate-like member that restricts the movement of one end of the pair of clamp members 61 and 62 in the Y direction (second direction). As shown in FIG. 5, the pair of first regulating members 65 is disposed at an interval D2 in the Y direction.
The pair of second restriction members 66 is a plate-like member that restricts the movement of the other ends of the pair of clamp members 61 and 62 in the Y direction. The pair of second regulating members 66 is disposed at an interval D2 in the Y direction. Here, the Y direction coincides with the horizontal direction orthogonal (cross) to the flow direction of the exhaust gas in the duct 10. Accordingly, one end and the other end of the pair of clamp members 61 and 62 are restricted from moving in the Y direction by the pair of first restricting members 65 and the pair of second restricting members 66 beyond the range of the distance D2.

FIG. 6 is a cross-sectional view of the connection pipe 50 and the support mechanism 60 of FIG. 4 taken along the line II-II. The solid line shows the state before introducing the exhaust gas and the broken line shows the state after introducing the exhaust gas. In FIG. 6, the lower side is a direction toward the center position of the duct 10 in the Y direction, and the upper side is a direction toward the outside of the duct 10.
As shown by the solid line in FIG. 6, since the upper header 30 is not thermally extended before the exhaust gas is introduced into the duct 10, the distance D1 between the pair of connecting pipes 50 is not affected by the thermal extension, and the pair of clamps The members 61 and 62 are disposed on the side of the center position of the duct 10 in the Y direction. On the other hand, as shown by a broken line in FIG. 6, after the exhaust gas is introduced into the duct 10, the temperature of the upper header 30 rises and the heat is extended, so the distance D1 between the pair of connecting pipes 50 becomes long. The members 61 and 62 move to the outside of the duct 10 in the Y direction within the range of the distance D2.

  The pair of third restricting members 67 is a plate-like member that restricts the movement of the pair of clamp members 61 and 62 in the X direction. In addition to the fact that the length in the X direction of the pair of clamp members 61 and 62 is not originally long, the temperature of the pair of clamp members 61 and 62 after exhaust gas is introduced into the duct 10 is disposed Even if there is a rise, the amount of heat spread is small. The pair of third restricting members 67 has a length substantially equal to the length of the pair of clamp members 61 and 62 in the X direction, or a distance between the lengths of the pair of clamp members 61 and 62 in the X direction. It is arranged empty. Therefore, the movement of the position in the X direction of the pair of clamp members 61 and 62 remains restricted.

  7 is a cross-sectional view taken along the line III-III in FIG. The slide plate 68 is a plate-like member disposed between one end of the clamp members 61 and 62 and the support beam 63, as shown in FIG. The slide plate 68 is also disposed between the other ends of the clamp members 61 and 62 and the support beam 64. The slide plate 68 is formed of a metal material (for example, stainless steel such as SUS304). The slide plate 68 is processed so that the surface roughness (for example, arithmetic average roughness Ra, maximum height Rz) becomes smaller than the upper surfaces of the support beams 63 and 64, and the surface property is large due to oxidation or the like. It is further preferred to use materials which do not change.

Next, a supporting method for supporting the loads of the plurality of heat transfer pipes 20 provided in the exhaust heat recovery boiler 100 will be described. In the present embodiment, the load of the plurality of heat transfer tubes 20 is supported by the support mechanism 60 by the following support method.
First, at the position where the support mechanism 60 is disposed, the plurality of ribs 51 protruding outward from the outer peripheral surface are joined by welding to the communication pipe 50 extending upward through the duct 10. At this time, the loads of the connection pipe 50, the upper header 30, the lower header 40, and the heat transfer pipe 20 are temporarily supported by other load support means (not shown). The connection tube 50 may have a plurality of ribs 51 protruding outward from the outer peripheral surface thereof welded in advance at a position where the support mechanism 60 is disposed.

Second, a pair of clamp members 61 and 62 are attached below the position where the plurality of ribs 51 are disposed to fasten the fastener 61a, and the pair of clamp members 61 and 62 sandwich the outer peripheral surface of the communication tube 50 It will be in the state.
Thirdly, temporary support of the load of the communication tube 50, the upper header 30, the lower header 40, and the heat transfer tube 20 by the load supporting means (not shown) is released, and both ends of the pair of clamp members 61 and 62 in the X direction. The lower surface is supported by the pair of support beams 63 and 64.
The load of the plurality of heat transfer tubes 20 is supported by the support mechanism 60 by the first to third steps described above.

An operation and an effect which the exhaust heat recovery boiler 100 of the present embodiment described above exhibits will be described.
According to the exhaust heat recovery boiler 100 of the present embodiment, the connecting pipe 50 extends upward from the upper header 30 connected to the plurality of heat transfer pipes 20 and penetrates the duct 10, and the upper side of the duct 10 of the connecting pipe 50 The rib 51 protrudes outward from the outer peripheral surface at a predetermined position of. A pair of clamp members 61 and 62 for clamping the outer peripheral surface is attached below the predetermined position of the communication tube 50, and the loads of the plurality of heat transfer tubes 20 are transmitted to the pair of clamp members 61 and 62 via the ribs 51. Be done. Loads of the plurality of heat transfer tubes 20 transmitted to the pair of clamp members 61 and 62 are provided from the lower surfaces of both end portions in the X direction (first direction) of the horizontal plane in which the pair of clamp members 61 and 62 extend. It is transmitted to 64.

  Instead of using a conventional hanging rod, using a connecting pipe 50 cooled by feed water or steam flowing inside to suppress a decrease in strength, using a normal high temperature metal material (for example, high chromium steel or stainless steel) The loads of the plurality of heat transfer tubes 20 can be supported. Since the plurality of heat transfer tubes 20 are disposed inside the duct 10 without penetrating the duct 10, the heat transfer tubes 20 can be easily installed and replaced. In addition, since the load of the plurality of heat transfer tubes 20 is supported by the support mechanism 60 above the duct 10 where the exhaust gas does not flow, the load of the heat transfer tubes 20 can be reliably supported even if the exhaust gas temperature rises.

  In the exhaust heat recovery boiler 100 of the present embodiment, the support mechanism 60 includes a pair of first restricting members 65 that restrict movement of one end of the pair of clamp members 61 and 62 in the Y direction to a horizontal plane orthogonal to the X direction; And a pair of second restricting members 66 that restrict the movement of the other ends of the pair of clamp members 61 and 62 in the Y direction. The pair of first restricting members 65 and the pair of second restricting members 66 can restrict movement of one end and the other end of the pair of clamp members 61 and 62 in the Y direction. Therefore, even if high temperature exhaust gas is introduced into the duct 10 and the temperature of the upper header 30 or the like rises and heat is extended, the positions of the upper header 30 and the plurality of heat transfer tubes 20 are arranged within a predetermined range. be able to.

  In the exhaust heat recovery boiler 100 of the present embodiment, the upper header 30 is a metal member formed in a cylindrical shape extending in the Y direction, and the upper header 30 is separated by a distance D1 in the Y direction. Are connected, and the pair of first restricting members 65 are arranged at an interval D2 in the Y direction, and the pair of second restricting members 66 are arranged at an interval D2 in the Y direction.

  Since the upper header 30 is a tubular member formed in a tubular shape extending in the Y direction, when high temperature exhaust gas is introduced into the duct 10, the length of the upper header 30 in the Y direction becomes longer due to heat expansion, and the upper portion The arrangement interval of the pair of communication pipes 50 connected to the header 30 in the Y direction becomes long. Since the pair of first restricting members 65 and the pair of second restricting members 66 are arranged at an interval D2 in the Y direction, the heat of the upper header 30 causes stress at the connection position of the pair of communication pipes 50 and the upper header 30 It does not cause

In the exhaust heat recovery boiler 100 of the present embodiment, the support mechanism 60 is disposed between the pair of clamp members 61 and 62 and the pair of support beams 63 and 64, and has a surface roughness higher than the upper surfaces of the pair of support beams 63 and 64. A pair of slide plates 68 are formed of a small metal material.
By doing this, when the pair of clamp members 61 and 62 move in the Y direction due to an external force such as thermal extension of the upper header 30 or an earthquake, the pair of clamp members 61 and 62 move smoothly. The support mechanism 60 does not generate excessive stress.

In the exhaust heat recovery boiler 100 of the present embodiment, the support mechanism 60 includes a pair of third regulating members 67 that regulate the movement of the pair of clamp members 61 and 62 in the X direction.
By doing this, it is possible to appropriately prevent the pair of clamp members 61 and 62 from moving in the X direction when an external force in the X direction is applied to the plurality of heat transfer pipes 20 due to an earthquake or the like. The positions of the upper header 30 and the plurality of heat transfer tubes 20 can be arranged at predetermined positions.

Second Embodiment
Next, a waste heat recovery boiler according to a second embodiment of the present invention will be described with reference to the drawings.
The present embodiment is a modification of the first embodiment, and is assumed to be the same as the first embodiment except in the case described below.

  In the exhaust heat recovery boiler of the first embodiment, the connecting pipe 50 is provided with a plurality of ribs 51 projecting outward from the outer peripheral surface at a position where the support mechanism 60 above the duct 10 is disposed. On the other hand, in the exhaust heat recovery boiler of the present embodiment, the connecting pipe 50 includes the ring (protrusion) 52 protruding outward from the outer peripheral surface at the position where the support mechanism 60 above the duct 10 is disposed. is there. The welding length with the ring 52 can be secured by welding over the entire circumference of the ring 52 so as to support the load required for the connecting pipe 50.

  FIG. 8 is a perspective view showing the connection pipe 50 and the support mechanism 60 of the exhaust heat recovery boiler 100 according to the present embodiment. As shown in FIG. 8, the connecting pipe 50 includes a ring 52 projecting outward from the outer circumferential surface at a position (predetermined position) where the support mechanism 60 above the duct 10 is disposed. The ring 52 is an annular member extending in the circumferential direction about the axis Z, and is joined to the connecting pipe 50 by welding. The ring 52 is made of, for example, high chromium steel or stainless steel.

The ring 52 is provided on the upper surface of the pair of clamp members 61 and 62 sandwiching the outer peripheral surface of the communication pipe 50 below the position where the rib 51 is joined to the communication pipe 50, the communication pipe 50, the upper header 30, the lower header 40, The loads of the plurality of heat transfer tubes 20 are transmitted.
According to the present embodiment, the loads of the connecting pipe 50, the upper header 30, the lower header 40, and the plurality of heat transfer pipes 20 are circumferentially rotated about the axis Z of the upper surface of the pair of clamp members 61 and 62 via the ring 52. It can be equally transmitted to each position.

Other Embodiments
In the above description, the pair of connecting pipes 50 is connected to the upper header 30 at an interval D1 along the direction in which the upper header 30 extends (Y direction in FIG. 5). It may be.
For example, a single connecting pipe 50 may be connected to the center of the upper header 30 in the Y direction.

  In the above description, when exhaust gas having a high temperature of 650 ° C. or higher is introduced into the duct 10, the support by the support mechanism 60 is effective, but the exhaust gas having a temperature of 600 ° C. or more and less than 650 ° C. is introduced. Even if it is the case, the support mechanism 60 of the first embodiment and the second embodiment is effective.

  For example, when the loads of the connecting pipe 50, the upper header 30, the lower header 40, and the plurality of heat transfer pipes 20 are heavier than the loads employed when exhaust gas having a high temperature of 650 ° C. or higher is introduced into the duct 10. Also, since a decrease in strength is suppressed by using a connecting pipe 50 cooled by feed water or steam flowing inside, a plurality of heat transfer pipes 20 using a normal high temperature metal material (for example, high chromium steel or stainless steel) Can support the load of It is effective to adopt the support mechanism 60 of the first embodiment and the second embodiment. In this case, the heavy-weight connection pipe 50, the upper header 30, the lower header 40, and the plurality of heat transfer pipes 20 can be reliably supported by the support mechanism 60.

DESCRIPTION OF SYMBOLS 10 Duct 11 Inlet 20 Heat-transfer pipe 30 Upper header 40 Lower header 50 Connecting pipe 51 Rib (protrusion)
52 ring (protrusion)
60 Support mechanism 61, 62 Clamp member (sandwich part)
61a Fasteners 63, 64 Support beam (support portion)
65 first regulating member 66 second regulating member 67 third regulating member 68 slide plate (plate-like member)
70 denitration device 80 steam drum 90 frame 100 exhaust heat recovery boiler X first direction Y second direction Z axis

Claims (6)

A duct into which exhaust gas is introduced;
A plurality of heat transfer tubes disposed inside the duct for circulating a fluid in heat exchange with the exhaust gas;
A horizontally extending header connected to the plurality of heat transfer pipes vertically above the plurality of heat transfer pipes and intersecting the flow direction of the exhaust gas;
A tubular communication pipe connected to the header, extending vertically upward from the header, penetrating the duct and having the fluid flow therethrough;
A support mechanism for supporting the communication pipe vertically above the duct;
The connecting pipe has a projection projecting outward from an outer peripheral surface at a predetermined position vertically above the duct,
The support mechanism is
A pinching portion pinching the outer peripheral surface of the communication pipe vertically below the predetermined position and extending in a first direction of a horizontal surface;
A pair of support parts which support the lower surface of the both ends of said 1st direction of said clamping part, Exhaust heat recovery boiler provided. The support mechanism is
A pair of first restricting members that restrict movement of the one end of the sandwiching portion in the second direction of the horizontal surface orthogonal to the first direction;
The exhaust heat recovery boiler according to claim 1, further comprising: a pair of second regulation members that regulate movement of the other end of the sandwiching portion in the second direction. The header is a metal member formed in a tubular shape extending in the second direction,
A pair of the connection pipes are connected to the header at an interval in the second direction,
The pair of first restriction members are disposed at predetermined intervals in the second direction,
The exhaust heat recovery boiler according to claim 2, wherein the pair of second regulation members are disposed at the predetermined interval in the second direction.   The support mechanism includes a pair of plate-like members disposed between the sandwiching portion and the pair of support portions and formed of a metal material having a surface roughness smaller than the upper surfaces of the pair of support portions. Waste heat recovery boiler as described.   5. The heat exhausting device according to claim 2, wherein the support mechanism includes a pair of third restricting members that restrict movement in the first direction at one end and the other end of the sandwiching portion. Recovery boiler. A supporting method for supporting loads of a plurality of heat transfer tubes provided in a waste heat recovery boiler, the method comprising:
The waste heat recovery boiler
A duct into which exhaust gas is introduced;
A plurality of heat transfer tubes disposed inside the duct for circulating a fluid in heat exchange with the exhaust gas;
A horizontally extending header connected to the plurality of heat transfer pipes vertically above the plurality of heat transfer pipes and intersecting the flow direction of the exhaust gas;
And a cylindrical communication pipe connected to the header, extending vertically upward from the header, penetrating through the duct, and having the fluid flowing therethrough.
Bonding a projection projecting outward to the outer peripheral surface of the communication pipe at a predetermined position vertically above the duct;
Attaching a sandwiching portion extending in a first direction of the horizontal plane vertically below the predetermined position to sandwich the outer peripheral surface of the communication pipe;
And supporting the lower surfaces of both end portions in the first direction of the holding portion with a pair of support portions.

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