JP2006292265A - Dust removing device for heat transfer tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust removing device for heat transfer tube, capable of performing high-density charge of a heat transfer tube and efficiently removing dust with a simple structure by solving the problem in a soot blow type dust removing method. <P>SOLUTION: The dust removing device for heat transfer tube is for a heat exchanger 1 comprising a plurality of heat transfer tube panels 2 arranged with each panel surface being in parallel to each other, the heat transfer panel 2 formed in a panel shape on which one heat transfer tube is arranged so that linear parts and U-shaped folded parts are alternately arranged. The device comprises a plurality of support members 4 extending vertically to each panel surface of the plurality of heat transfer tube panels 2 and supporting each heat transfer tube of the plurality of heat transfer tube panels 2 at least at one position. One end 4a of each support member 4 is fixed to a first wall surface 2a of one of two opposed wall surfaces of a casing 3, the other end 4b of each support member 4 is supported on a second wall surface 3b of the other of the two opposed wall surfaces so to be movable back and forth in the extending direction of the support member 4, and a vibration application device 5 for applying a mechanical vibration is fixed to the outer side of the first wall surface 3a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dust removing device for removing dust accumulated on the surface of a heat transfer tube of a heat exchanger such as an economizer, a boiler, or a superheater.

  In order to maintain heat recovery efficiency (heat transfer efficiency) in a heat exchanger such as an economizer, it is necessary to remove dust accumulated on the surface of the heat transfer tubes. Then, as a method of removing the dust deposited on this heat transfer tube, for example, there are removal methods described in Patent Documents 1 to 3 below.

  Patent Document 1 discloses a dust removing method using a soot blow method. In the soot blow system, a steam type soot blower (soot blower) is installed in the vicinity of the heat transfer tube, and the dust deposited on the heat transfer tube is mechanically removed by the steam sprayed from the soot blower.

  In Patent Document 2, a plurality of heat transfer tube panels (tube panels) suspended in a furnace are connected to each other by a panel connecting member, and vibration due to hammering is applied to the end of the panel connecting member to thereby transfer the heat transfer tube. A mechanical vibration type dust removing method is disclosed in which dust accumulated on the surface is removed by mechanical vibration.

  Patent Document 3 discloses a mechanical vibration type dust removing method that applies mechanical vibration to a heat transfer tube to remove dust accumulated on the heat transfer tube. Specifically, the heat transfer tube of the heat transfer tube panel is supported through the furnace wall, the folded portion of the heat transfer tube of the heat transfer tube panel is located outside the furnace wall, and sealed with the gas seal casing. A connection support member that supports one side of the heat transfer tube panel in the casing is provided, a vibration source that applies intermittent vibration to the connection support member is provided outside the gas seal casing, and intermittent vibration from the vibration source is added to the heat transfer tube panel. It has a possible configuration.

JP 05-164319 A JP 59-142399 A JP 11-294994 A

  In the dust removal method by the soot blow system as disclosed in Patent Document 1, it is necessary to secure a space for installing the soot blower between the heat transfer tubes. Also, in economizers, it is customary to use blocks with multiple heat transfer tube panels arranged in parallel and stacked along the flow direction of the hot gas, and it is necessary to secure a space for installing the soot blower for each block. This was a factor that hindered downsizing of the entire system.

  In the soot blow system, dust accumulated on the heat transfer tube by steam spraying is removed, and erosion due to steam with respect to the heat transfer tube near the soot blower has been a problem. Furthermore, when the heat transfer tubes are densely arranged like an economizer, the sprayed steam does not reach the heat transfer tubes far away from the soot blower and the shadowed portion of the heat transfer tubes, and dust is not removed. There was also a problem.

  In the mechanical vibration type dust removal method having the configuration disclosed in Patent Document 2, a part of the heat transfer tube panel is separated from a member that supports the suspension by connecting the heat transfer tube along the panel surface of the heat transfer tube panel. It is necessary to provide a hammering mechanism in the furnace that includes a striking point coupling member that couples the heat transfer tube portion that receives the impact, and a striking member that couples the striking point coupling member, and that strikes the striking member was there. Since the hammering mechanism is required to be provided in the furnace, the structure is complicated, maintenance and inspection are not easy, and many members are required in addition to the members that support a normal heat transfer tube panel.

  In the mechanical vibration type dust removing method having the configuration disclosed in Patent Document 3, a mechanical vibration generation source such as a hammering mechanism is installed outside the furnace. Since the mold folding portion is also exposed to the outside of the furnace, heat recovery efficiency is reduced, and a gas seal casing needs to be provided separately, resulting in a complicated structure.

  The present invention has been made in view of the above-mentioned problems, and its object is to eliminate the problems of the soot blow type dust removal method, enable high-density mounting of heat transfer tubes, and to efficiently collect dust with a simple configuration. The object is to provide a dust removing device for a heat transfer tube that can be removed.

  In order to achieve the above object, a heat transfer tube dust removing device according to the present invention includes a heat transfer tube panel in which one heat transfer tube is formed in a panel shape by alternately arranging straight portions and U-shaped folded portions, A dust removal device for heat transfer tubes in a heat exchanger comprising a plurality of panels parallel to each other, wherein the heat transfer tube dust removal device extends in a direction perpendicular to each panel surface of the plurality of heat transfer tube panels, and A plurality of support members that support each of the heat transfer tubes at at least one location, and one end of each support member is fixed to a first wall surface on one side of two wall surfaces facing each other of the casing of the heat exchanger; A vibration in which the other end of each of the support members is supported on the second wall surface on the other side of the two opposing wall surfaces so as to be able to reciprocate in the extending direction of the support member, and adds mechanical vibration to the first wall surface. The additional device is The first characterized by being fixed to the outside of the wall.

  Furthermore, the dust removal device for a heat transfer tube according to the present invention having the above characteristics is characterized in that the extending direction of the support member is a horizontal direction or a vertical direction.

  Furthermore, in the dust removal device for a heat transfer tube according to the present invention of any one of the above features, the plurality of heat transfer tube panels are entirely accommodated in the casing except for a feed end and a feed end of the heat transfer tube. The third feature is that it is supported only by the support member.

  Furthermore, the dust removal apparatus for a heat transfer tube according to the present invention having any one of the above features is characterized in that the support members support the heat transfer tubes of the plurality of heat transfer tube panels at the straight portions. And

  Furthermore, the dust removing device for a heat transfer tube according to the present invention having any one of the above features has a fifth feature that a plurality of the vibration applying devices are dispersedly arranged on the outside of the first wall surface.

  According to the dust removing device for a heat transfer tube having the above characteristics, mechanical vibrations generated by the vibration applying device are transmitted from the first wall surface to the support member fixed to the first wall surface, and each support member is in its extending direction. The mechanical vibration is further transmitted to each heat transfer tube of the plurality of heat transfer tube panels supported by each support member, and the dust accumulated on the tube surface of each heat transfer tube is shaken off and removed. .

  Further, since each support member is supported on the second wall surface so as to be able to reciprocate in the extending direction of the support member, the mechanical vibration transmitted to the support member can be prevented from being absorbed on the second wall surface, and vibration can be prevented. The mechanical vibration generated in the additional device is efficiently transmitted to each heat transfer tube of the plurality of heat transfer tube panels, and each support member is supported by the first wall surface and the second wall surface facing each other. The whole can be reliably supported with respect to the casing.

  Furthermore, since the installation space for the soot blower required in the soot blow method is not required, a plurality of heat transfer tube panels can be mounted in the casing with high density, and a heat exchanger such as an economizer can be downsized.

  Further, since the entire plurality of heat transfer tube panels can be accommodated in the casing by the support structure, it is not necessary to expose a part of the heat transfer tube panel outside the casing, and efficient heat recovery is possible.

  In addition, since one support member has a structure that supports at least one portion of each of the plurality of heat transfer tube panels, each of the plurality of heat transfer tube panels has a structure that is supported by the entire plurality of support members. Even if there is a problem with the connection between the first wall surface or the second wall surface of one support member, the support of a plurality of heat transfer tube panels or the transmission of mechanical vibration is not significantly impaired. Therefore, support of a plurality of heat transfer tube panels and transmission of mechanical vibrations can be effectively realized with a simple support structure of only a support member.

  In particular, when the extending direction of the support member is horizontal, the plurality of heat transfer tube panels are suspended from the first wall surface and the second wall surface by the plurality of support members by supporting the support member on the casing at both ends. The load on the heat transfer tube panel can be reliably supported. Further, the extending direction of the support member can be a vertical direction.

  Further, each support member supports each heat transfer tube of the plurality of heat transfer tube panels at the straight portion, so that the support position of the heat transfer tube of each support member can be arbitrarily adjusted, and the load on the heat transfer tube panel is adjusted by each support member. Stable support becomes possible.

  Further, since the vibration applying device is fixed to the outside of the first wall surface, maintenance and inspection of the vibration adding device is facilitated.

  In addition, when a plurality of vibration applying devices are distributed outside the first wall surface, the mechanical vibration generated by the vibration applying device is distributed and transmitted to the first wall surface, so that the mechanical vibration becomes more uniform. The dust transmitted to each support member and deposited on the surface of each heat transfer tube can be more effectively removed over the entire heat transfer tube.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a heat transfer tube dust removing device according to the present invention (hereinafter abbreviated as “the present device” as appropriate) will be described below with reference to the drawings. In the following description, an economizer is assumed as an example of a heat exchanger provided with the device of the present invention.

  FIG. 1 is a cross-sectional view of the economizer 1 (an example of a heat exchanger) provided with the apparatus of the present invention as viewed from the front, taken along the line A-A ′ of FIGS. FIG. 2 is a cross-sectional view taken along the B-B ′ cross section of FIG. 1 when the economizer 1 is viewed from the right side. FIG. 3 is a side view of the economizer 1 as viewed from the right side. FIG. 4 is a plan view of the economizer 1 as viewed from above.

  As shown in FIGS. 1 to 4, the economizer 1 includes a plurality of heat transfer tube panels 2, a casing 3 that houses the plurality of heat transfer tube panels 2, a support member 4 that supports the plurality of heat transfer tube panels 2, a plurality of A vibration applying device 5 for applying mechanical vibration to the heat transfer tube panel 2, a heat transfer pipe 6 flowing through the heat transfer tube of the heat transfer tube panel 2, and a heat transfer tube of the heat transfer tube panel 2 are passed through. A heat medium delivery pipe 7 is provided.

  Each of the plurality of heat transfer tube panels 2 has a structure in which the panel surfaces formed in the same meandering shape are arranged in parallel with each other and aligned in the vertical direction, and the surrounding four side surfaces are surrounded by the casing 3 and are opened up and down. The hot gas for heat exchange flows up and down. Therefore, the economizer 1 shown in the present embodiment can be used by being stacked up and down. In the following description, the right wall surface of the casing 3 is referred to as a first wall surface 3a, the left wall surface is referred to as a second wall surface 3b, the front wall surface is referred to as a third wall surface 3c, and the rear wall surface is referred to as a fourth wall surface 3d. In the present embodiment, the panel surface of each heat transfer tube panel 2 is in a positional relationship parallel to the left and right first wall surfaces 3a and second wall surfaces 3b. 1 to 4, each wall surface of the casing 3 is illustrated in a simple flat shape, but a reinforcing steel plate (not shown) is provided at an upper end portion or a lower end portion of each wall surface. It is also preferable.

  Each heat transfer tube panel 2 is formed by forming a single heat transfer tube into a panel shape by alternately arranging straight portions 2a and U-shaped folded portions 2b, and an inlet end 2c of each heat transfer tube panel 2 is formed. The delivery end 2d penetrates the fourth wall surface 3d and communicates with the heat medium feed pipe 6 and the feed pipe 7 fixed to the outside of the fourth wall face 3d. In the present embodiment, each heat transfer tube panel 2 includes 25 U-shaped folded portions 2b and 26 straight portions 2a, and 13 of the 25 U-shaped folded portions 2b are fed. It is located on the far side (the front third wall surface 3c side) from the input end 2c and the delivery end 2d. In each heat transfer tube panel 2, the heat medium fed from the feed pipe 6 via the feed end 2 c passes through the casing 3 in the vertical direction at the plurality of linear portions 2 a and the U-shaped folded portion 2 b. It is heated by exchanging heat with the high-temperature gas, and sent to the delivery pipe 7 via the delivery end 2d.

  The support member 4 is provided with through-holes of the heat transfer tube of the heat transfer tube panel 2 at equal intervals along the longitudinal direction in the steel plate (flat steel in the present embodiment), and one heat transfer tube panel 2 is transferred to each through-hole. The straight portion 2a of the heat tube is inserted. Therefore, the number of through holes in each support member 4 is the same as the number of heat transfer tube panels 2 (22 in this embodiment). Further, the straight portions 2a of the heat transfer tubes at the same position of the plurality of heat transfer tube panels 2 are inserted into the through holes of one support member 4, and the same through holes at the same position of the support members 4 are inserted. Different linear portions 2a of the heat transfer tube panel 2 are inserted. In the present embodiment, the second to 26th straight portions 2 a from the feeding end 2 c side are inserted through the through holes at the same positions of the respective support members 4 and supported by the respective support members 4. Accordingly, 25 support members 4 are used, which is one less than the number of straight portions 2a of each heat transfer tube panel 2. Further, the longitudinal direction (stretching direction) of each support member 4 is perpendicular to the panel surface of each heat transfer tube panel 2.

  Moreover, in this embodiment, the support position in each linear part 2a is changed in the even-numbered linear part 2a and the odd-numbered linear part 2a from the sending-in end 2c side. In other words, the even-numbered straight line portion 2a has a support position at a position closer to the third wall surface 3c in front of the center, and the odd-numbered straight line portion 2a has a support position at a position closer to the fourth wall surface 3d in the rear than the center. It is said. Here, when the first straight portion 2a is supported by the support member 4, mechanical vibration applied to the support member 4 is directly applied to the straight portion 2a in the vicinity of the feeding end 2c joined to the fourth wall surface 3d. In this embodiment, the first straight portion 2a is not supported by the support member 4 because it is added.

  Each support member 4 is supported at its left and right ends by a first wall surface 3a and a second wall surface 3b. As shown in FIG. 5, the right end portion 4a of each support member 4 is fixed to the first wall surface 3a by welding or the like. FIG. 5A is an enlarged plan view of a main part in which the coupling part of the support member 4 and the first wall surface 3a indicated by “A” in FIG. 4 and the periphery thereof are displayed. FIG. 5B is a plan view of FIG. It is principal part sectional drawing which expanded and displayed the coupling | bond part of the supporting member 4 and 1st wall surface 3a instruct | indicated by middle "a", and its periphery.

  The left end 4b of each support member 4 is supported so as to be movable in the vertical direction (longitudinal direction of the support member 4) with respect to the second wall surface 3b. Specifically, as shown in FIG. 6, a long hole 4 c that is long in the longitudinal direction of the support member 4 for inserting a bolt is provided in the left end portion 4 b of each support member 4, and the casing 3 having the bolt insertion hole is provided in the casing 3. The engaging portion 8 projecting toward the second wall surface 3b is fixed to the second wall surface 3b by welding or the like, and the left end portion 4b and the engaging portion 8 are overlapped with the elongated hole 4c of the left end portion 4b and the bolt insertion hole of the engaging portion 8. Is bolted. Since the long hole 4c of the left end 4b is a long hole long in the longitudinal direction of the support member 4, each support member 4 is allowed to reciprocate in the longitudinal direction on the left end 4b side. FIG. 6A is an enlarged plan view of a main part of the engagement portion between the support member 4 and the second wall surface 3b indicated by “I” in FIG. 4 and the periphery thereof, and FIG. FIG. 2 is an enlarged cross-sectional view of a main part in which an engagement portion between a support member 4 and a second wall surface 3b indicated by “I” in FIG.

  The vibration applying device 5 is a mechanical vibration generating source such as an air knocker or a vibration motor, and is installed outside the first wall surface 3a of the casing 3 via a steel plate 9 as shown in FIGS. In the present embodiment, six vibration applying devices 5 are used, and three are along the position where the right end portion 4a of each support member 4 that supports the even-numbered linear portion 2a is supported by the first wall surface 3a. The other three units are installed in a distributed manner along the position where the right end 4a of each support member 4 that supports the even-numbered linear portion 2a is supported by the first wall surface 3a. Yes. The steel plate 9 is provided in order to reinforce the first wall surface 3 a and transmit the mechanical vibration generated by the vibration applying device 5 to each support member 4 evenly.

  The mechanical vibration generated by each of the six vibration applying devices 5 is transmitted to the first wall surface 3a through the mold steel in which the vibration applying devices 5 are installed, and each support member 4 fixed to the first wall surface 3a. The dust transferred to the entire heat transfer tubes of the plurality of heat transfer tube panels 2 supported by the support members 4 and deposited on the tube surfaces of the heat transfer tubes, regardless of the deposition position, It is shaken off and removed by mechanical vibration.

  In the present embodiment, the plurality of support members 4 transmit mechanical vibration from the first wall surface 3a to each heat transfer tube panel 2 and suspend each heat transfer tube panel 2 between the first wall surface 3a and the second wall surface 3b. The function of supporting the load of each heat transfer tube panel 2 is achieved.

  Next, another embodiment of the device of the present invention will be described.

  <1> In the above embodiment, an economizer is assumed as an example of a heat exchanger provided with the device of the present invention, but the heat exchanger may be a boiler, a superheater, or the like.

  <2> In the above embodiment, the heat exchanger provided with the device of the present invention has a structure in which the four sides are surrounded by the casing 3 and the upper and lower sides are opened, and the hot gas for heat exchange flows vertically. However, a structure in which high-temperature gas flows in the lateral direction may be used. For example, the first wall surface 3a and the second wall surface 3b may be arranged vertically, and the third wall surface 3c and the fourth wall surface 3d may be arranged left and right. In this case, the longitudinal direction (stretching direction) of each support member 4 is the vertical direction.

  <3> The structure of the heat transfer tube panel 2, the number of panels, the number of straight portions 2a and the U-shaped folded portion 2b, the number of support members 4 that support the heat transfer tube panel 2, and the support members 4 exemplified in the above embodiment The support position of the heat transfer tube supported by is not limited to the above embodiment, and can be changed as appropriate.

  <4> In the above embodiment, the case where flat steel is used as the support member 4 has been described. However, steel having other cross-sectional shapes such as L steel and H steel may be used.

  <5> In the above-described embodiment, each support member 4 is configured to support a separate heat transfer tube panel 2 in each through-hole. You may make it form in 2 rows instead of 1 row, and may support each heat exchanger tube panel 2 in the support position of two heat exchanger tubes by two through-holes.

  <6> Moreover, in the said embodiment, although the support position of the heat exchanger tube of each support member 4 was made into two places of right and left of the linear part 2a of a heat exchanger tube, you may distribute a support position to three or more places. Further, the fixing method of one end of the support member 4 and the supporting method capable of reciprocating in the longitudinal direction of the other end are not limited to the above embodiment, and can be appropriately changed in accordance with the gist of the present invention.

  The dust removal device for a heat transfer tube according to the present invention can be used to remove dust accumulated on the surface of the heat transfer tube of a heat exchanger such as an economizer, a boiler, or a superheater.

Sectional drawing in the A-A 'section of Drawing 2 and Drawing 3 which looked at the economizer provided with one embodiment of the dust removal device of the heat exchanger tube concerning the present invention from the front Sectional drawing in B-B 'section of Drawing 1 which looked at an economizer provided with one embodiment of a dust removal device of a heat exchanger tube concerning the present invention from the right side The side view which looked at the economizer provided with one Embodiment of the dust removal apparatus of the heat exchanger tube which concerns on this invention from the right side surface The top view which looked at the economizer provided with one Embodiment of the dust removal apparatus of the heat exchanger tube which concerns on this invention from the upper surface (A): A plan view of a main part in which the support member indicated by “A” in FIG. 4 and the connecting portion of the first wall surface and the periphery thereof are enlarged and displayed. (B): Support indicated by “A” in FIG. Main part sectional drawing which expanded and displayed the joint part of a member and the 1st wall surface, and its circumference (A): A plan view of an essential part in which the engagement portion between the support member and the second wall surface designated by “I” in FIG. 4 and the periphery thereof is enlarged and displayed. (B): Indicated by “I” in FIG. Sectional drawing which expanded and displayed the engagement part of the support member and the 2nd wall surface which were left and the circumference | surroundings

Explanation of symbols

1: Economizer (heat exchanger)
2: Heat transfer tube panel 2a: Straight portion 2b: U-shaped folded portion 2c: Inlet end 2d: Outlet end 3: Casing 3a: First wall surface 3b: Second wall surface 3c: Third wall surface 3d: Fourth wall surface 4: Support member 4a: Right end portion of support member 4b: Left end portion of support member 4c: Long hole for bolt insertion 5: Vibration adding device 6: Infeed tube 7: Outlet tube 8: Engaging portion 9: Shape steel

Claims (5)

Heat transfer tube dust in a heat exchanger comprising a plurality of heat transfer tube panels in which a straight heat transfer tube and a U-shaped folded portion are alternately arranged to form a panel. A removal device,
A plurality of support members that extend in a direction perpendicular to the panel surfaces of the plurality of heat transfer tube panels and support the heat transfer tubes of the plurality of heat transfer tube panels at at least one location, respectively;
One end of each supporting member is fixed to a first wall surface on one side of two opposing wall surfaces of the casing of the heat exchanger, and the other end of each supporting member is on the other side of the two opposing wall surfaces. The second wall surface is supported so as to be capable of reciprocating in the extending direction of the support member,
A dust removing device for a heat transfer tube, wherein a vibration applying device for applying mechanical vibration to the first wall surface is fixed to the outside of the first wall surface.   The dust removal device for a heat transfer tube according to claim 1, wherein the extending direction of the support member is a horizontal direction or a vertical direction.   The plurality of heat transfer tube panels are accommodated entirely in the casing and supported only by the support member, except for an inlet end and an outlet end of the heat transfer tube. Dust removal device for heat transfer tubes.   The said each supporting member supports each said heat exchanger tube of these heat exchanger tube panels in the said linear part, The dust removal apparatus of the heat exchanger tube of any one of Claims 1-3 characterized by the above-mentioned. The dust removing device for a heat transfer tube according to any one of claims 1 to 4, wherein a plurality of the vibration applying devices are arranged dispersedly on the outside of the first wall surface.