JP2018096588A - Boiler, boiler assembling method, and flow regulating member installation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boiler, a boiler assembling method and a flow regulating member installation method in which a worn-out state of a heat transfer pipe and a heat transfer pipe supporting member caused by steam or the like injected from a soot blower is restricted.SOLUTION: A boiler comprises a heat transfer pipe 11 extending in a substantial horizontal direction while being installed in a flue where combustion gas flows; a supporting member 12 having a supporting part 22 supporting the heat transfer pipe 11 against the flue; a soot blower for injecting steam against the surface of the heat transfer pipe 11 to remove deposit accumulated at the surface of the heat transfer pipe 11; a flow regulating plate 14 having a slant surface for use in flow regulating the steam injected from the soot blower. The flow regulating plate 14 is arranged between the supporting part 22 and the soot blower. The slant surface of the flow regulating plate 14 is slanted substantially in a horizontal direction and the lower end of said slant surface is slanted in such a way that it is far from the supporting part 22.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a boiler having a suit blower for removing ash accumulated on the surface of a heat transfer tube, a method for assembling the boiler, and a method for installing a rectifying member provided in the boiler.

Of the heat transfer tubes used in heat exchangers such as superheaters, reheaters and economizers (conserving economizers) installed in boilers, the horizontal type is supported by a support member so that it extends horizontally in the flue and burns Some perform heat recovery by contact with gas. In pulverized coal-fired boilers that use carbon-containing fuel as fuel, when heat recovery is performed in a horizontal heat exchanger, ash in the combustion gas accumulates on the surface of the heat transfer tube, and heat from the heat transfer tube There is a problem that the recovery efficiency is lowered. In order to solve this problem, a pulverized coal-fired boiler is provided with a suit blower in a flue through which combustion gas flows, and a fluid such as steam is sprayed onto the surface of the heat transfer tube by the suit blower to the heat transfer tube. Remove accumulated ash, etc.
On the other hand, since various members such as a plurality of heat exchangers and metal fittings supporting the heat exchanger are provided in the flue, the flow of the combustion gas or the like is not uniform, and the drift of the combustion gas or the like is generated and accumulated. An uneven situation occurs in the ash content. The members near the location where the drift of the combustion gas or the like has occurred may be locally worn due to the ash contained in the combustion gas. Further, a suit blower that removes unevenly deposited ash or the like may need to eject a fluid over a relatively wide range.

  As a configuration for preventing wear of the heat transfer tube due to the drift of the combustion gas, there is, for example, one disclosed in Patent Document 1. Patent Document 1 discloses a furnace having a loop tube formed by bending a plurality of heat transfer tubes into a required shape and arranged in parallel, and a plurality of straight heat transfer tubes arranged in parallel in the same direction as the flow direction of the combustion gas. In order to prevent the combustion gas from flowing into the gap formed by the wall tube, a configuration is disclosed in which a baffle is disposed on the furnace wall tube at a required angle.

Japanese Utility Model Publication No. 61-192106

  However, Patent Document 1 is intended to prevent wear of the heat transfer tube due to the drift of the combustion gas, and supports the heat transfer tube and the heat transfer tube that support the heat transfer tube caused by steam or the like injected from the suit blower. It is not intended to suppress the wear of the member.

  In a boiler equipped with a suit blower, when removing ash deposited on the surface of the heat transfer tube by a fluid such as steam jetted from the suit blower, a relatively wide range is used to remove ash deposited unevenly. In order to eject the fluid, the fluid is also ejected to the support portion between the heat transfer tube and the support member that supports the heat transfer tube. A gap is inevitably generated in the support portion between the heat transfer tube and the support member, but when fluid is injected into the support portion, the fluid entrains the ash contained in the combustion gas or the accumulated ash in the gap. In some cases, it would flow in. In this gap, the flow passage cross-sectional area becomes narrow, so the flow velocity of the fluid containing ash increases, and the fluid containing ash collides with the surface of the heat transfer tube and the support member forming the gap at a high flow velocity. As a result, erosion may occur at this collision location. Thereby, the subject that abrasion generate | occur | produces locally also generate | occur | produced also in the heat exchanger tube and support member in which the clearance gap was formed.

  In addition, for example, in order to protect the support member from the combustion gas, there is a structure provided with a protector as shown in FIG. 5 (note that FIG. 5 will be described later). In the vicinity of the suit blower 101, the protector 103 has ash and deposits contained in the combustion gas in the gap formed between the lower end of the protector 103 and the upper portion of the heat transfer tube 102. As a result, the heat transfer tube 102 and the protector 103 may be locally worn.

  The present invention has been made in view of such circumstances, and a boiler that suppresses wear of a heat transfer tube and a heat transfer tube support member that supports the heat transfer tube due to a fluid such as steam injected from a suit blower, It aims at providing the assembly method of a boiler, and the installation method of a baffle member.

In order to solve the above problems, the boiler, the method for assembling the boiler, and the method for installing the rectifying member of the present invention employ the following means.
A boiler according to an aspect of the present invention includes a heat transfer pipe disposed in a flue through which combustion gas flows and extending in a substantially horizontal direction, and a support member having a support portion that supports the heat transfer pipe with respect to the flue, A fluid ejecting means for ejecting fluid onto the surface of the heat transfer tube to remove deposits deposited on the surface of the heat transfer tube; and a rectifying member having an inclined surface for rectifying the fluid; The inclined surface of the rectifying member is disposed between a support portion and the fluid ejecting means, is inclined with respect to a substantially horizontal direction, and the lower end of the inclined surface is inclined away from the support portion. Yes.

  In the above configuration, the fluid such as the steam ejected from the fluid ejecting means toward the support portion collides with the inclined surface of the rectifying member and flows along the inclined surface. Since the inclined surface is inclined with respect to the substantially horizontal direction and the lower end of the inclined surface is inclined away from the support portion, the fluid flowing along the inclined surface flows away from the support member. Thus, since the flow of the fluid is rectified by the rectifying member, the fluid ejected from the fluid ejecting means does not reach the support portion directly. Therefore, foreign matter (ash content, etc.) contained in the combustion gas and foreign matter such as blown up deposits are prevented from colliding with the support part in the fluid ejected from the fluid ejecting means. It can suppress that the support member and heat exchanger tube near a location wear locally. A typical example of the fluid ejecting means is a suit blower. The deposit typically includes ash and soot.

  In addition, typically, a plate-like rectifying member can be used as the rectifying member having an inclined surface. The inclined surface may be an inclined surface that uniformly inclines from the upper end to the lower end.

  In such a configuration, the fluid ejected from the fluid ejecting means is rectified more effectively, and rectified according to the direction of the steam ejected from the suit blower toward the heat transfer tube support and the strength of the ejected flow. The effect is optimized, the fluid ejected from the fluid ejecting means including foreign matter such as deposits is prevented from colliding with the support part, and the support member and the heat transfer tube near the support part are locally worn. This can be suppressed.

  A boiler according to an aspect of the present invention includes a protective member that protects the support member from the combustion gas, and the inclined surface of the rectifying member is fixed to the protective member so as to face the fluid ejecting unit. May be.

  In the above configuration, since the protection member that protects the support member from the combustion gas is provided, the rectification member can be simply fixed by fixing the rectification member to the protection member.

  Further, for example, even if a gap is formed between the protective member and the heat transfer tube, in the above configuration, since the rectifying member is provided so as to cover the surface of the protective member on the suit blower side, the jet is injected from the suit blower. The fluid directed to the protective member is rectified by the rectifying member, and the fluid ejected from the fluid ejecting means including foreign matter such as deposits is less likely to flow into the gap between the protective member and the heat transfer tube. It is possible to suppress the local support member and the heat transfer tube from being locally worn. In addition, since the fluid injected from the fluid injection means containing foreign substances, such as a deposit, hardly reaches the side which is not facing a suit blower, it is not necessary to provide a rectifying member.

  In the boiler according to one aspect of the present invention, the inclined surface of the rectifying member may be a plurality of inclined surfaces having different angles with respect to a substantially horizontal direction. In the boiler according to an aspect of the present invention, the inclined surface of the rectifying member may be a curved surface.

  In the above configuration, the fluid ejected from the fluid ejecting means is more effectively rectified, and the rectifying effect is adjusted in accordance with the direction of the steam ejected from the suit blower toward the support portion of the heat transfer tube and the strength of the ejected flow. Optimized to prevent the fluid ejected from the fluid ejecting means containing foreign matter such as deposits from colliding with the support part, and to locally wear the support member and the heat transfer tube near the support part. Can be suppressed.

  In the boiler according to an aspect of the present invention, a plurality of the rectifying members may be provided, and the plurality of rectifying members may be arranged side by side so that the inclined surfaces of the respective rectifying members face substantially the same direction. .

  In the said structure, since the several rectification | straightening member is arrange | positioned side by side, the length of each rectification | straightening member becomes short. Therefore, since the amount of deformation when each rectifying member is thermally deformed is reduced, the load generated at the mounting portion of the rectifying member can be reduced, and large deformation or breakage of the rectifying member can be prevented.

  Note that the inclination angles of the inclined surfaces of the plurality of rectifying members with respect to the substantially horizontal direction need not all be the same. The inclination angle of the inclined surfaces of some of the rectifying members may be changed from the inclination angle of the inclined surfaces of the other rectifying members. Moreover, you may change the inclination-angle of an inclined surface according to the generation | occurrence | production state of abrasion of a supporting member and a heat exchanger tube. For example, you may make the inclination angle of the inclined surface of the baffle member provided in the wall surface vicinity of a flue smaller than the inclination angle of another baffle member. In this case, the ash in the combustion gas collides with the support portion together with the fluid ejected from the fluid ejecting means even in the vicinity of the wall of the flue where the flow velocity of the fluid ejected from the fluid ejecting means and the combustion gas increases. Can be reliably prevented, and wear of the support member and the heat transfer tube in the vicinity of the support portion can be suppressed.

  In the boiler according to one aspect of the present invention, each of the plurality of rectifying members may be disposed apart from the adjacent rectifying member.

  In the above configuration, since the plurality of rectifying members are arranged apart from the adjacent rectifying members, it is possible to prevent each rectifying member from being thermally deformed and interfering with the adjacent rectifying members.

  In the boiler according to an aspect of the present invention, the rectifying member includes a slit extending from the other end on the opposite side to the one end fixed to the protective member to the longitudinal direction of the rectifying member and extending in the direction of the one end. It may be formed.

  In the said structure, the slit is formed in the rectification | straightening member. Thereby, when the rectifying member is thermally deformed, the deformation is absorbed by the slit, and the deformation of the entire rectifying member is suppressed. Moreover, since the slit extends in a direction intersecting with the longitudinal direction of the rectifying member, thermal deformation in the longitudinal direction of the rectifying member having a large amount of deformation can be suitably absorbed. Therefore, damage to the rectifying member can be prevented.

  A method for assembling a boiler according to an aspect of the present invention includes a step of installing a heat transfer tube extending in a substantially horizontal direction in a flue through which combustion gas flows, and a support portion that supports the heat transfer tube with respect to the flue. A step of installing a support member, a step of installing a fluid ejecting means for ejecting fluid from above the heat transfer tube to remove deposits deposited on the surface of the heat transfer tube, and a jetting toward the support unit A rectifying member having an inclined surface for rectifying the fluid, the inclined surface is inclined with respect to a substantially horizontal direction between the support portion and the fluid ejecting means, and a lower end of the inclined surface is supported by the supporting member. And an installation step so as to be inclined away from the section.

  A method of installing a rectifying member according to an aspect of the present invention includes a heat transfer pipe disposed in a flue through which combustion gas flows and extending in a substantially horizontal direction, and a support portion that supports the heat transfer pipe with respect to the flue. A boiler having a support member and fluid ejecting means for ejecting fluid onto the surface of the heat transfer tube to remove deposits deposited on the surface of the heat transfer tube; and an inclined surface that rectifies the fluid. The rectifying member is installed between the support portion and the fluid ejecting means so that the inclined surface is inclined with respect to a substantially horizontal direction and the lower end of the inclined surface is inclined away from the support portion. To do.

  In the said structure, the rectification | straightening member is installed with respect to the boiler. Therefore, for example, by adding a rectifying member to an existing boiler that cannot rectify the fluid ejected from the fluid ejecting means, the fluid ejected from the fluid ejecting means can be a rectified boiler. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, local abrasion of the heat exchanger tube and the heat exchanger tube support member etc. which support a heat exchanger tube can be suppressed.

It is the side view which showed typically the inside of the flue of the boiler which concerns on embodiment of this invention. It is the side view which showed typically the heat exchanger which concerns on embodiment of this invention. It is an enlarged view of the broken-line circle part of FIG. It is a perspective view of the baffle member concerning the embodiment of the present invention. It is a perspective view which shows the case where the baffle member which concerns on this invention is not provided.

Below, one embodiment of boiler 1 concerning the present invention is described with reference to drawings.
The boiler 1 according to the present embodiment uses a carbon-containing fuel as a fuel and coal pulverized coal or the like as a fuel, and recovers combustion heat generated by burning the fuel with a combustion burner (not shown) in a heat exchanger. Is a boiler 1 capable of

  As shown in FIG. 1, a boiler 1 according to this embodiment includes a furnace 2 that burns fuel to generate combustion gas, and a flue that circulates the combustion gas generated in the furnace 2 as indicated by arrows in FIG. 1. 3. A flue 3 is connected to the vertical upper end of the furnace 2. The flue 3 has a horizontal portion 3a that allows the combustion gas generated in the furnace 2 to flow in the horizontal direction, and a vertical portion 3b that continues to the downstream end of the horizontal portion 3a and flows the combustion gas downward in the vertical direction. Yes. And in this flue 3, the superheater, the reheater, and the economizer are arrange | positioned as a heat exchanger for collect | recovering the heat | fever of combustion gas. In this embodiment, the 1st superheater 5 and the 1st reheater 6 are provided in the horizontal part 3a in the flue 3, and the 2nd superheater 7, the 2nd reheater 8, and the economizer in the vertical part 3b. 9 is provided. In these heat exchangers, heat exchange is performed between the combustion gas generated in the furnace 2 and water or steam flowing through the heat transfer tubes 11 of the heat exchanger. In this embodiment, the 1st superheater 5 and the 1st reheater 6 which are arrange | positioned at the horizontal part 3a are set as the vertical installation type | mold installed so that the heat exchanger tube 11 may be extended in a vertical up-down direction, The 2nd superheater 7, the 2nd reheater 8, and the economizer 9 which are arrange | positioned are set as the horizontal installation type installed so that the heat exchanger tube 11 may extend in a horizontal direction.

Next, the configuration of the horizontal heat exchanger according to the present embodiment will be described with reference to FIGS.
As shown in FIGS. 2 to 4, the second superheater 7, the second reheater 8, and the economizer 9, which are horizontal heat exchangers according to the present embodiment, respectively, A heat transfer tube 11 extending in the orthogonal horizontal direction, a support member 12 that supports the heat transfer tube 11 with respect to the flue 3, a protector (protection member) 13 that protects the support member 12 from combustion gas, and a protector 13 are fixed. And a rectifying plate (rectifying member) 14 for rectifying steam (fluid) ejected from a suit blower (fluid ejecting means) 15 described later.
Further, in the flue 3, a suit blower 15 that removes ash (deposits) deposited on the surface of the heat transfer tube 11 by injecting steam toward the heat transfer tube 11 from obliquely above the support member 12 and the protector 13 in the vertical direction. Also arranged.

  The heat transfer tube 11 extends over substantially the entire horizontal direction in the flue 3, and has a structure in which the heat transfer tube 11 is folded in a substantially vertical direction in the vicinity of the vertical wall portion 3 c of the flue 3 a plurality of times. Water or steam circulates inside the heat transfer tube 11, the lower end of the heat transfer tube 11 communicates with the inlet header tubes 7b, 8b, 9b, and the upper end communicates with the outlet header tubes 7a, 8a, 9a. The heat transfer tube 11 is connected to various devices such as a steam drum and a steam turbine (not shown) via the inlet header tubes 7b, 8b and 9b and the outlet header tubes 7a, 8a and 9a. The heat exchanger of this embodiment has a plurality of heat transfer tubes 11. The plurality of heat transfer tubes 11 are arranged side by side over substantially the entire area in the flue 3 in a direction orthogonal to the extending direction A1 of the heat transfer tubes 11.

  The support member 12 includes a first support member 21 extending in a substantially vertical direction and a second support member (support portion) 22 that is fixed to the lower end of the first support member 21 and supports the heat transfer tube 11. A plurality of support holes (not shown) penetrating in the extending direction A1 are formed on the side surface of the second support member 22 perpendicular to the extending direction A1 of the heat transfer tube 11, and the heat transfer tubes 11 are inserted into the plurality of support holes. The plurality of heat transfer tubes 11 are supported by being inserted.

  As shown in FIG. 2, a suit blower 15 is arranged on one side of the support member 12 in the horizontal direction, and steam is injected from the diagonally upward direction of the support member 12 and the rectifying plate 14 toward the heat transfer tube 11 to transfer heat. The ash (deposit) deposited on the surface of the heat tube 11 is removed. As shown in FIGS. 3 and 4, the protector 13 includes a plate-like horizontal surface portion 25 extending in a direction orthogonal to the extending direction A <b> 1 of the heat transfer tube 11, and an end on the side where the suit blower 15 of the horizontal surface portion 25 is disposed. A plate-like first vertical surface portion 26 extending substantially vertically downward from the portion, and a plate-like second vertical surface portion 27 extending substantially vertically downward from an end portion of the horizontal surface portion 25 where the suit blower 15 is not disposed. . Lower ends of the first vertical surface portion 26 and the second vertical surface portion 27 are close to the surface of the heat transfer tube 11. A lower portion of the first support member 21 and an upper portion of the second support member 22 are disposed between the first vertical surface portion 26 and the second vertical surface portion 27. A through hole 25a penetrating in the vertical vertical direction is formed in the horizontal surface portion 25, and the first support member 21 is inserted through the through hole 25a. That is, the horizontal surface portion 25, the first vertical surface portion 26, and the second vertical surface portion 27 are provided so as to surround the lower part of the first support member 21 and the upper part and both sides of the upper part of the second support member 22. Further, as shown in FIG. 4, the protector 13 includes a first plate portion 28 provided so as to be laminated on the upper surface of the horizontal surface portion 25, and a first plate near the place where the first support member 21 passes through the horizontal surface portion 25. It further has a second plate portion 29 extending obliquely upward in the direction of the first support member 21 from the end portion of the plate portion 28 on the side where the suit blower 15 is disposed.

  As shown in FIG. 4, a plurality of rectifying plates 14 are provided. The plurality of rectifying plates 14 are arranged side by side in the extending direction of the protector 13, and the adjacent rectifying plates 14 are installed with a gap therebetween. The length L2 of the gap between the adjacent rectifying plates 14 is 2 mm so as to suppress interference due to the difference in thermal expansion of each member and to prevent most of the steam ejected from the suit blower 15 from flowing from the gap length L2. Is set to -10 mm, more preferably 5 mm to 6 mm.

  Each rectifying plate 14 is formed of a highly wear-resistant material (for example, SUS304), and as shown in FIGS. 2 and 3, is inclined from the upper end of the first vertical surface portion 26 with respect to the extending direction A1 of the heat transfer tube 11. By inclining so as to have an angle θ, an inclined surface facing the suit blower 15 is formed. The inclination angle θ is preferably 30 ° to 80 °, more preferably 45 ° to 60 °. The rectifying plate 14 and the protector 13 are fixed by welding or spot welding, and the lower end of the rectifying plate 14 and the surface of the heat transfer tube 11 are separated from each other. The separation distance L1 is preferably 30 mm to 200 mm, more preferably 50 mm to 150 mm, depending on the state of the steam ejected from the suit blower 15. By appropriately selecting the separation distance L1, it is possible to prevent interference between the rectifying plate 14 and the heat transfer tube 11 while maintaining the rectifying effect, and prevent most of the steam ejected from the suit blower 15 from flowing in. it can. FIG. 2 is a diagram schematically showing the positional relationship between the members, and the longitudinal section of the rectifying plate 14 is shown in a triangular shape for the purpose of illustration.

  The length L3 of each rectifying plate 14 in the longitudinal direction (the direction orthogonal to the extending direction A1 of the heat transfer tube 11) is set to 300 mm to 1000 mm, more preferably 400 mm to 1000 mm, depending on the installation interval of the support members 12. Set to 700 mm. Moreover, the plate | board thickness of each baffle plate 14 is set to t3 mm-t10 mm from the self-weight deformation and thermal-stress deformation | transformation suppression, More preferably, it sets to t5 mm-t6 mm. By setting the plate thickness to 10 mm or less, the temperature difference between the front and back sides is reduced, and the warpage of the rectifying plate 14 can be suppressed. Each rectifying plate 14 is formed with a plurality of slits 31 extending from the lower end, which is an unfixed end, to the upper end direction by a predetermined length. The plurality of slits 31 are formed in the longitudinal direction of the rectifying plate 14 such that the slit interval L5 is shorter than the length L3 and is set to 100 mm to 500 mm, and more preferably 100 mm to 300 mm. Further, the width L4 of the slit 31 is set to 2 mm to 10 mm, more preferably 5 mm to 6 mm, similarly to the length L2 of the gap.

  As shown in FIG. 2, the suit blower 15 is disposed obliquely upward in the vertical direction on one side of the rectifying plate 14 in the horizontal direction. The suit blower 15 has a cylindrical shape extending in a direction orthogonal to the extending direction A1 of the heat transfer tube 11 (that is, the extending direction of the rectifying plate 14), and has an injection hole (not shown) for injecting steam onto the curved surface. Is formed. The suit blower 15 is configured to inject steam over the entire heat transfer tube 11 by injecting steam while rotating about the longitudinal axis. The fluid ejected from the suit blower 15 is not limited to steam. Air or an inert gas such as nitrogen may be used.

According to this embodiment, there exist the following effects.
In the present embodiment, the steam injected from the suit blower 15 toward the protector 13 collides with the rectifying plate 14 and flows along the surface of the rectifying plate 14 (an arrow shown in FIG. 2 and an arrow shown in FIG. 3). reference). Since the rectifying plate 14 is inclined with respect to the horizontal direction (extending direction A1 of the heat transfer tube 11) and the lower end of the rectifying plate 14 is inclined away from the protector 13, the rectifying plate 14 is along the surface of the rectifying plate 14. The flowing steam flows away from the support member 12 and the protector 13. Thus, since the flow of steam is rectified by the rectifying plate 14, most of the fluid ejected from the suit blower 15 does not reach the protector 13, the support member 12 near the protector 13, and the heat transfer tube 11 near the protector 13.

  If the rectifying plate 14 is not provided, as shown in FIG. 5, the steam G <b> 1 injected from the suit blower 101 near the suit blower 101 side of the protector 103 is the first support member 104 and the second support member 104. When it collides with the protector 103 fixed to the support member 105 or the heat transfer tube 102, an entrained airflow G2 is generated. Since a gap is formed between the protector 103 and the heat transfer tube 102 in consideration of thermal deformation or the like, the entrained airflow G2 flows into the gap while containing ash or accumulated ash in the combustion gas. . When the entrained airflow G2 flows into the gap, the cross-sectional area of the flow path becomes narrower in the gap, so that the flow velocity increases, and the ash contained in the entrained airflow G2 locally forms the lower surface of the protector 103 and the surface of the heat transfer tube 102 that form the gap. Will wear out.

  In this embodiment, since the steam from the suit blower 15 is rectified by the rectifying plate 14 as described above, the entrained airflow G2 is not generated, and ash is contained in the gap between the protector 13 and the heat transfer tube 11. Steam does not flow in. Therefore, local abrasion of the lower surface of the protector 13 and the surface of the heat transfer tube 11 can be suppressed.

  Moreover, in this embodiment, since the baffle plate 14 is being fixed to the protector 13 which is a comparatively simple shape, the baffle plate 14 can be provided simply. Moreover, in this embodiment, since the baffle plate 14 is not provided in the side surface of the protector 13 by which the suit blower 15 is not provided, a cost increase can be suppressed as a simple structure.

  Moreover, in this embodiment, since the several baffle plate 14 is arrange | positioned along with it, the length of the longitudinal direction of each baffle plate 14 becomes short. Therefore, since the amount of deformation in the longitudinal direction when each rectifying plate 14 is thermally deformed due to the difference in thermal expansion is small, deformation of the rectifying plate 14 itself and a load generated at a fixed portion between the rectifying plate 14 and the protector 13 are caused. It is possible to reduce and prevent large deformation and breakage of the current plate 14.

  Further, in the present embodiment, since the plurality of rectifying plates 14 are arranged apart from the adjacent rectifying plates 14, it is possible to prevent each rectifying plate 14 from being thermally deformed and interfering with the adjacent rectifying plates 14. . In this embodiment, the length L2 of the gap between the adjacent rectifying plates 14 is set to 2 mm to 10 mm, and more preferably 5 mm to 6 mm. However, when the length L2 of the gap exceeds 10 mm, the rectification is performed. Since the inflow amount of steam or combustion gas into the gap between the plates 14 increases and the effect of suppressing wear of the heat transfer tube 11 and the protector 13 is reduced, it is set to 10 mm or less.

  In the present embodiment, the rectifying plate 14 has an end that is not fixed at the lower end opposite to the upper end fixed to the protector 13, and intersects the longitudinal direction of the rectifying plate 14 from the lower end of the rectifying plate 14. A slit 31 extending in the upper end direction is formed. Thereby, when the rectifying plate 14 is thermally deformed due to the temperature distribution, the thermal stress is cut off by the slit 31, so that the deformation is absorbed and the deformation of the entire rectifying plate 14 is suppressed. Further, since the slit 31 extends in a direction intersecting the longitudinal direction of the rectifying plate 14, thermal deformation in the longitudinal direction of the rectifying plate 14 having a large amount of deformation due to thermal expansion can be suitably absorbed. Therefore, damage to the rectifying plate 14 can be prevented.

  The rectifying plate 14 does not need to have the same plate thickness, inclination angle, formation interval of the slits 31 and the like depending on the installation position, and may be changed. For example, the rectifying plate 14 disposed in a region where the flow velocity of the steam and the combustion gas injected from the suit blower 15 is increased, such as in the vicinity of the vertical wall portion 3c of the flue 3, is exposed to a gas having a high flow velocity. And the meat loss increases. The plate thickness of the rectifying plate 14 arranged in such a region may be thicker than the plate thicknesses of the other rectifying plates 14, and the plate thickness may be, for example, 6 mm to 10 mm. If the thickness exceeds t10 mm, the plate thickness is set to 10 mm or less, and the slit interval L5 is further shortened in the longitudinal direction of the rectifying plate 14 to be 100 mm to 300 mm, thereby increasing the front-back temperature difference and suppressing thermal warpage deformation. By adopting such a configuration, it is possible to use the rectifying plate 14 disposed in a region where the flow velocity is high for a long period of time. Further, in the vicinity of the vertical wall portion 3c of the flue 3, the surface temperature distribution of the rectifying plate 14 to be arranged also increases, but the interval between the slits 31 provided in such a rectifying plate 14 may be narrowed. By setting it as such a structure, the thermal curvature of the baffle plate 14 is suppressed, and the baffle plate 14 can be used for a long period of time.

  Further, the rectifying plate 14 may change the mounting angle based on the occurrence of local wear of the heat transfer tube 11 in the vicinity of the position where the rectifying plate 14 is installed. When the wear region of the nearby heat transfer tube 11 is wide, the inclination angle θ is reduced, and when the wear region of the nearby heat transfer tube 11 is narrow, the inclination angle θ is preferably increased to suppress local wear of the heat transfer tube 11 suitably. be able to. For example, the inclination angle θ of the rectifying plate 14 provided in the vicinity of the vertical wall portion 3c of the flue 3 may be set to 30 ° to 50 °, and may be smaller than the inclination angle θ of the other rectifying plates 14. In this case, ash and accumulated ash in the combustion gas were injected from the suit blower 15 even in the vicinity of the vertical wall portion 3c of the flue where the flow velocity of the steam and combustion gas injected from the suit blower 15 increases. It can be prevented that it is contained in the steam and flows into the gap between the protector 13 and the heat transfer tube 11.

Note that the present invention is not limited to the invention according to each of the above embodiments, and can be appropriately modified without departing from the gist thereof. For example, in the said embodiment, although the member which rectifies | straightens the vapor | steam injected from the suit blower 15 is made into the plate-shaped rectification | straightening plate 14, the member which rectifies | steams steam does not need to be plate-shaped. It is only necessary to have an inclined surface similar to the inclined surface formed by the rectifying plate 14 of the present embodiment, and the inclined surface may be an inclined surface uniformly inclined from the upper end to the lower end in the vertical direction. It may be an inclined surface or a curved surface (curved surface). By making the inclined surface formed by the rectifying plate 14 into a plurality of inclined surfaces or curved surfaces, the direction of the steam injected from the suit blower 15 toward the second support member 22 of the heat transfer tube 11 and the strength of the injection flow are matched. By optimizing the rectifying effect, the steam blown from the suit blower 15 and containing the ash content can be more effectively prevented from flowing into the gap between the protector 13 and the heat transfer tube 11, thereby suppressing wear. it can.
Further, a part of the protector 13 may be inclined and combined with the current plate 14. For example, the vapor | steam injected from the suit blower 15 may be rectified by providing the 1st vertical surface part 26 of the said embodiment so that it may incline with respect to the heat exchanger tube 11. FIG. Moreover, in this embodiment, although the baffle plate 14 was formed with material with high abrasion resistance (for example, SUS304), the raw material which forms the baffle plate 14 is not limited to this. However, as the Cr content increases, Cr oxide is formed in the innermost layer and the amount of erosion damage is reduced. Therefore, if a raw material having a high Cr content is used, the rectifying plate 14 can be used for a long time. . Further, a ceramic plate with high wear resistance may be attached to the surface of the rectifying plate 14, or a ceramic material may be formed of a sprayed film.

  In addition, installation of the baffle plate 14 which concerns on this invention is not implemented only with respect to the boiler in the middle of an assembly, You may implement additionally with the existing boiler already assembled.

1 boiler 2 furnace 3 flue 11 heat transfer tube 12 support member 13 protector (protective member)
14 Current plate (rectifier member)
15 Suit blower (fluid injection means)
21 1st support member 22 2nd support member (support part)
25 Horizontal surface portion 26 First vertical surface portion 27 Second vertical surface portion 31 Slit A1 Extension direction θ of heat transfer tube Inclination angle

Claims (9)

A heat transfer tube disposed in a flue through which combustion gas flows and extending in a substantially horizontal direction;
A support member having a support portion for supporting the heat transfer tube with respect to the flue;
Fluid ejecting means for ejecting fluid onto the surface of the heat transfer tube to remove deposits deposited on the surface of the heat transfer tube;
A rectifying member having an inclined surface for rectifying the fluid,
The rectifying member is disposed between the support portion and the fluid ejecting means,
The boiler in which the inclined surface of the rectifying member is inclined with respect to a substantially horizontal direction, and the lower end of the inclined surface is inclined away from the support portion. A protection member for protecting the support member from the combustion gas;
The boiler according to claim 1, wherein the inclined surface of the rectifying member is fixed to the protective member so as to face the fluid ejecting means.   The boiler according to claim 1, wherein the inclined surface of the rectifying member is a plurality of inclined surfaces having different angles with respect to a substantially horizontal direction.   The boiler according to any one of claims 1 to 3, wherein the inclined surface of the rectifying member is a curved surface. A plurality of the rectifying members are provided,
The boiler according to any one of claims 1 to 4, wherein the plurality of rectifying members are arranged side by side so that the inclined surfaces of the rectifying members face in substantially the same direction.   The boiler according to claim 5, wherein each of the plurality of rectifying members is disposed separately from the adjacent rectifying members.   The slit which extends in the direction of the said one end crossing the longitudinal direction of the said rectifying member from the other end part on the opposite side to the one end fixed to the said protection member is formed in the said rectifying member. The boiler in any one of 6. Installing a heat transfer tube extending in a substantially horizontal direction in the flue through which the combustion gas flows;
Installing a support member having a support portion for supporting the heat transfer tube with respect to the flue;
Installing fluid ejecting means for ejecting fluid onto the surface of the heat transfer tube to remove deposits deposited on the surface of the heat transfer tube;
A rectifying member having an inclined surface for rectifying the fluid, the inclined surface is inclined with respect to a substantially horizontal direction between the support portion and the fluid ejecting means, and a lower end of the inclined surface is supported by the supporting member. And a method of assembling the boiler including a step of installing the apparatus so as to be inclined away from the section. A heat transfer tube disposed in a flue through which combustion gas flows and extending in a substantially horizontal direction;
A support member having a support portion for supporting the heat transfer tube with respect to the flue;
Fluid ejecting means for ejecting fluid onto the surface of the heat transfer tube to remove deposits deposited on the surface of the heat transfer tube;
For boilers with
A rectifying member having an inclined surface for rectifying the fluid, wherein the inclined surface is inclined with respect to a substantially horizontal direction between the support portion and the fluid ejecting means, and a lower end of the inclined surface is the support portion. The installation method of the baffle member installed so that it may incline so that it may distance from.

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