JP2012047377A - Dust removing device of heat transfer tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust removing device of heat transfer tubes, capable of reducing driving force.SOLUTION: The dust removing device of the heat transfer tubes includes: a heat transfer tube group having the plurality of heat transfer tubes 3 arranged in parallel at intervals in a lateral direction, the heat transfer tube being formed in a meandering shape by connecting a group of horizontal tubes lined up at intervals in a longitudinal direction by U tube parts with opposite ends directed to one side in the horizontal tube longitudinal direction and piercing a casing; a plurality of tube support members 4a provided corresponding to the respective heat transfer tubes of the heat transfer tube group, connecting the other end sides of the respective heat transfer tubes in the horizontal tube longitudinal direction of the horizontal tube group 3a and supported separably by a support frame 5 fixed in the casing 2; a rotary drive shaft 7; a plurality of cam parts 9 provided on the rotary drive shaft 7; and leverage type lever members 6 supported swingably about a horizontal axis, engaged with the cam parts 9 and the tube support members 4a and shaking vertically the tube support members 4a while being swung by the cam parts 9.

Description

  The present invention relates to an apparatus for removing dust adhering to a waste heat boiler such as a waste incinerator boiler and an industrial waste incinerator boiler that recovers heat from combustion gas containing dust, and a heat exchanger tube of a heat exchanger, In particular, the present invention relates to a dust removing device that removes dust adhering to a heat transfer tube having a configuration in which horizontal tube groups arranged in parallel in a vertical direction are connected in a meandering manner.

  Since dust adhering to the heat transfer tube becomes a heat transfer impediment factor, the boiler or heat exchanger can reduce the heat transfer area by effectively removing the dust adhering to the heat transfer tube, making it more compact. Can be planned.

  Conventionally, in boilers and heat exchangers that recover heat from gas containing dust such as fly ash, dust attached to heat transfer tubes is mainly removed by steam soot blow (Patent Document 1 and the like). Steam soot blow blows away dust adhering to heat transfer tubes by spraying steam at high speed from the nozzle holes formed in the element tubes toward the gap between the heat transfer tubes and the parallel heat transfer tubes. There are known a reciprocating type, a reciprocating type (T-shaped tube), a long insertion / extraction type, and the like.

  8 and 9 show an example of stationary rotation type. 8 is a longitudinal sectional view, and FIG. 9 is a cross-sectional side view taken along the line AA in FIG. The combustion gas G is flowing in the direction of the arrow. The element tube 20 is disposed in a direction orthogonal to the heat transfer tube 3 at at least one position (upstream side in FIGS. 8 and 9) upstream, downstream, and intermediate of the heat transfer tube 3 arranged in the casing 2. The nozzle hole 20a is provided in the element tube 20 at a position corresponding to the interval g (FIG. 9) between the adjacent heat transfer tubes 3, and the element tube 20 is periodically rotated from the nozzle hole 20a while rotating around the axis. Steam is ejected to remove dust adhering to the heat transfer tube. In FIG. 8, reference numerals 4 </ b> A and 4 </ b> B are support hardwares that support the heat transfer tubes 3.

  FIGS. 10 and 11 are reciprocating examples, and at least one place upstream, downstream, and intermediate of the heat transfer tube 3 (only one place on the upstream side in FIGS. 10 and 11) with respect to the heat transfer tube 3. An element tube 20 in an orthogonal direction is installed, and a nozzle hole 20a is provided in the element tube 20 at a position corresponding to the gap g (FIG. 11) of the heat transfer tube 3. As shown in FIG. While moving 20 back and forth in the longitudinal direction of the heat transfer tube 3, steam is ejected from the nozzle holes 20 a to remove dust adhering to the heat transfer tube 3.

  FIGS. 12 and 13 are examples of a long insertion / removal type, and at least one place on the upstream side, the downstream side, and the middle of the heat transfer tube 3 (only one place on the upstream side in FIGS. 12 and 13) with respect to the heat transfer tube 3. The element tube 20 is installed in a direction orthogonal to each other, and several nozzle holes 20a are provided at the tip of the element tube 20, and are pulled out of the casing 2 when stopped, and the element tube 20 is periodically rotated around the axis. While rotating, the heat transfer tube 3 is moved forward and backward in the orthogonal direction, and steam is ejected from the nozzle holes 20a to remove dust adhering to the heat transfer tube.

  However, the steam soot blow has the following problems.

  That is, it is necessary to take measures against erosion of the heat transfer tube by soot blow steam.

  Further, since a large amount of steam is temporarily used during the soot blow operation, the amount of steam sent to the turbine generator and other processes is changed.

  Moreover, since the dust removal effect decreases as the distance from the nozzle hole decreases, the effective range is limited, and uniform removal over the entire length of the heat transfer tube is difficult. For this reason, it may be necessary to install a plurality of element tubes.

  Also, in the stationary rotation type and the reciprocating type, nozzle holes are provided in accordance with the gaps between the heat transfer tubes adjacent in the horizontal direction, so the number of nozzle holes increases, and dust is removed compared to the long insertion / removal type with few nozzle holes. Efficiency and effective range are inferior.

  Moreover, since steam is injected to aim at the gap between the heat transfer tubes, it is difficult to remove the dust D adhering to the back surface of the heat transfer tubes, as shown in FIGS. 9, 11, and 13.

  Furthermore, in the long insertion / removal type, the element tube is pulled out of the casing to stand by at the time of stoppage, so it is usually used in high-temperature areas where it is difficult to ensure the durability of the element tube, but it is necessary to secure the extraction allowance outside the casing. This increases the installation space.

  As a dust removal device for heat transfer tubes, in addition to a steam soot blower, devices for removing dust by forcibly shaking the heat transfer tubes by hammering or a vibrator are known (Patent Documents 2 to 4, etc.) ). This is mainly applied to heat transfer tubes suspended vertically. 14 and 15 show an example of a hammering device (blowing device) 21 of the heat transfer tube 3 (hanging tube) supported on the upper portion. The hammering device 21 includes a shaft 21a inserted through the U-shaped tube portion, a flange 21b fixed to the shaft 21a, and a hammer portion 21c that strikes the shaft 21a. A striking force is applied to the lower part of the suspended heat transfer tube 3 which is a free end by hammering from the lateral direction through the flange portion 21b, and only the U-shaped tube is hit at the free end. Therefore, the heat transfer tube can be shaken with a relatively small striking force, and a dust removal effect can be obtained.

  However, as shown in FIG. 16, the hammering device 21 applies a striking force or vibration from the lateral direction to the heat transfer tube 3 in which the horizontal tubes 3 a arranged in the vertical direction are connected in a meandering manner as shown in FIG. 17. Therefore, if the dust attached to the heat transfer tubes is to be removed, all the heat transfer tubes 3 arranged in the horizontal direction are integrally shaken, and thus a large impact force is required. When the striking force is increased, the heat transfer tube 3 is easily damaged. Further, when the tube support member 4 is placed and supported without being fixed on the support frame 5, the frictional force between the tube support member 4 and the support frame 5 becomes resistance, so that the effect of hammering is achieved. In addition, there is a problem that the heat transfer tube may not be completely returned to its original position after being hit. Therefore, it is not realistic to hit the heat transfer tube group arranged horizontally from the lateral direction. In the case of hammering, there is also a problem that vibration cannot be applied to the heat transfer tube when a gap or the like is generated between the heat transfer tube and the vibration transmission device that applies vibration.

  On the other hand, a dust removing device that applies vibration in the vertical direction to a heat transfer tube having the same horizontal tube group as in FIG. 16 has also been proposed (Patent Document 5). This device is a dust removal device for a heat transfer tube in which a heat transfer tube having a horizontal tube group is provided in a direction intersecting with the gas flow in the high temperature gas passage, and passes through the furnace wall of the high temperature gas passage, and gas on the outside thereof. A vibration generating source that is supported in a sealed state by the seal casing and that applies intermittent vibration to a connection support member that supports one side of the heat transfer tube is provided outside the gas seal casing.

JP-A-5-164319 JP-A-5-196222 Japanese Utility Model Publication No. 61-69695 JP 58-95199 A JP 11-29494 A

  However, in the dust removal device that applies vibration in the vertical direction to the heat transfer tubes provided with the horizontal tube group, when the heat transfer tube provided with the horizontal tube group is vibrated up and down, in order to lift the free end side of the heat transfer tube, It is necessary to bend the heat transfer tubes elastically, and in order to lift all the heat transfer tubes arranged in parallel with a gap in the horizontal direction at the same time, a large amount of power is required and the impact on the support frame etc. when dropped The load also increases.

  In general, when a casing such as a furnace wall such as a boiler has a penetrating portion, it is necessary to seal in order to prevent high temperature gas from being blown out. However, the heat transfer tube disclosed in Japanese Patent Application Laid-Open No. 11-29494 is required. In the dust removal device, all the horizontal pipes penetrate the casing as the furnace wall, and the horizontal pipe penetrating the furnace wall can be sealed by the gas seal casing provided outside the furnace wall. It is difficult to prevent high temperature gas from flowing between the seal casing and the dust removal device itself will not function properly if dust or the like accumulates between the furnace wall and the gas seal casing.

  Furthermore, if the seal at the furnace wall penetration location is an expansion joint such as a sealed bellows, the number of penetration locations is a demerit from the viewpoint of the durability of the expansion joint itself.

  Therefore, the present invention mainly aims to provide a dust removing device that can efficiently remove dust with relatively small power in a dust removing device that vibrates in a vertical direction with respect to a heat transfer tube including a horizontal tube group. To do. Furthermore, another object of the present invention is to provide a dust removing device that can be easily gas-sealed.

  In order to achieve the above object, the present invention provides, as a first means, an apparatus for removing dust adhering to a heat transfer tube arranged in a casing of a boiler or heat exchanger that recovers heat from a gas containing dust. A heat transfer tube which is formed in a meandering manner by connecting horizontal tube groups arranged at intervals in the vertical direction at a U-shaped tube portion, and has both end portions directed to one side in the horizontal tube length direction and penetrating the casing. Are provided in correspondence with each heat transfer tube of the heat transfer tube group and support the other side in the horizontal tube length direction of the horizontal tube group of each heat transfer tube. And a plurality of tube support members that are detachably supported by a support frame fixed in the casing, a driving source disposed outside the casing, and extending horizontally through the casing, the driving Rotation driven by source A rotary drive shaft, a plurality of cam portions provided on the rotary drive shaft in the casing, and a swingable support around a horizontal axis in the casing, and swung by the cam portion to move the tube. And a lever lever member that swings the support member up and down.

  Moreover, the present invention is a device for removing dust adhering to a heat transfer tube disposed in a casing of a boiler or heat exchanger that recovers heat from a gas containing dust, as a second means, in the longitudinal direction A plurality of heat transfer tubes penetrating the casing are formed in a meandering manner by connecting horizontal tube groups arranged at intervals to each other at a U-shaped tube portion and having both end portions directed to one side in the horizontal tube length direction. Heat transfer tube groups arranged in parallel at intervals in the direction, and provided corresponding to each heat transfer tube of the heat transfer tube group, supporting the other side in the horizontal tube length direction of the horizontal tube group of each heat transfer tube, and the casing A plurality of pipe support members supported in a separable manner by a support frame fixed inside, a drive source disposed outside the casing, and extending horizontally in the outside of the casing and driven to rotate by the drive source. Rotation drive And a plurality of cam portions provided on the rotary drive shaft, and supported by the cam portion so as to be swingable around a horizontal axis. And a horizontal lever that swingably supports the lever member is disposed in the opening so as to hermetically close the opening formed in the wall of the casing. A dust removing device is provided.

  In the first means or the second means, the plurality of cam portions are arranged with their positions around the axis of the rotary drive shaft shifted so as to swing the plurality of tube support members at different timings. Is preferred.

  In the first means, the rotary drive shaft passes through the casing via a shaft seal member, and the engagement position between the cam portion and the lever lever member can be adjusted. It is preferable that the shaft sealing member is attached to the casing so that the position thereof can be adjusted.

  The shaft seal member includes: a gland packing arranged in an airtight manner around the rotary drive shaft; a staffin box that accommodates the gland packing; and a packing presser that presses the gland packing into the staffin box. Preferably, the staffin box is fixed to the casing by a fastening member, and one or both fastening member insertion holes of the staffin box and the casing are formed as long holes.

  In the second means, it is preferable that the rotational drive shaft is provided so that an engagement position between the cam portion and the lever lever member can be adjusted.

  According to the present invention, the lever member is operated at the cam portion of the rotary drive shaft, and the heat transfer tube including the horizontal tube group is vibrated up and down using the lever principle of the lever lever. The load can be reduced.

  In addition, by providing a plurality of cam portions with different phases around the axis of the rotary drive shaft, each of the heat transfer tubes arranged in the horizontal direction can be lifted at different timings, and when all the heat transfer tubes are lifted simultaneously In comparison, the driving force of the rotary drive shaft can be reduced, and the impact load applied to the support frame and the like when the heat transfer tube is dropped can be reduced. Furthermore, since the dust is sequentially removed from the plurality of heat transfer tubes, it is possible to prevent the dust discharge portion from being blocked due to the dust falling at a time, and to reduce the load on the dust discharge device.

  Further, the lever-type lever member is accommodated in the casing, and the rotational drive shaft that drives the lever-type lever member passes through the casing, whereby the number of through holes in the casing can be further reduced.

  Further, by disposing the rotation fulcrum of the rotary drive shaft or lever lever member at the through hole position of the casing, the movable range at the through hole portion is minimized, and the through hole and the rotary drive shaft or lever lever member are Since the gap between the two can be reduced, gas sealing is facilitated.

It is a vertical front view which shows 1st Embodiment of the dust removal apparatus which concerns on this invention. It is a vertical side view along the II-II line of FIG. It is the elements on larger scale of FIG. FIG. 4 is an enlarged bottom view taken along line IV-IV in FIG. 1. It is the elements on larger scale of FIG. It is a vertical front view which shows 2nd Embodiment of the dust removal apparatus which concerns on this invention. It is a principal part enlarged view which expands and shows the principal part of FIG. It is a vertical front view which shows the conventional dust removal apparatus. It is a vertical side view along the AA line of the dust removal apparatus of FIG. It is a vertical front view which shows the other conventional dust removal apparatus. It is a vertical side view which follows the BB line of the dust removal apparatus of FIG. It is a vertical front view which shows other conventional dust removal apparatuses. It is a vertical side view along CC line of the dust removal apparatus of FIG. It is a vertical front view which shows other conventional dust removal apparatuses. It is a vertical side view along the DD line of the dust removal apparatus of FIG. It is a vertical front view which shows other conventional dust removal apparatuses assumed. It is a vertical side view along the EE line of the dust removal apparatus of FIG.

  Hereinafter, embodiments of a dust removing apparatus according to the present invention will be described with reference to the drawings. In all the drawings and all the examples, the same or similar components are denoted by the same reference numerals.

  1st Embodiment of the dust removal apparatus which concerns on this invention is described with reference to FIGS. 1 is a vertical front view of the dust removing device, FIG. 2 is a vertical side view of the dust removing device of FIG. 1, FIG. 3 is a partially enlarged view of FIG. 1, and FIG. 4 is an enlarged bottom view taken along line IV-IV of FIG. FIG. 5 is a partially enlarged view of FIG.

  The dust removing device 1 is a device that removes dust attached to a heat transfer tube 3 disposed in a casing 2 of a boiler or heat exchanger that recovers heat from a gas G containing dust. The heat transfer tube 3 is formed in a meandering manner by connecting horizontal tubes 3a arranged at intervals in the vertical direction with a U-shaped tube portion 3b, and both end portions 3e and 3f are disposed on one side in the length direction of the horizontal tube 3a ( The casing 2 is directed toward the left side of FIG. Further, the heat transfer tubes 3 are arranged in parallel in the depth direction of FIG. 1 (left and right direction of FIG. 2) at intervals, thereby forming a heat transfer tube group. 1 and 2 indicate the flow direction of the combustion gas containing dust.

  The horizontal tubes 3a of the heat transfer tubes 3 are supported by tube support members 4a and 4b on both sides in the length direction of the horizontal tubes 3a. The tube support members 4a and 4b are detachably mounted on a support frame 5 fixed horizontally in the casing 2. As shown in FIG. 2, the tube support members 4a and 4b are provided in each of the heat transfer tubes 3 arranged in parallel in the horizontal direction.

  The tube support member 4a can include, for example, a pair of strip plates 4a1, 4a2 (FIG. 2) sandwiching both sides of the heat transfer tube 3, and a bolt / nut 4a3 (FIG. 1) that fastens the pair of strip plates. Although not shown, the tube support member 4b can also have the same configuration.

  A hole at the upper end of the tube support member 4a and a long hole 6a (see FIG. 3) on one end side of the lever lever member 6 are rotatably connected by a shaft 4c.

  The lever lever member 6 of the first embodiment is disposed inside the casing 2 and is swingably attached to a horizontal shaft 6b fixed in the casing 2 as shown in FIG.

  The lever lever member 6 only needs to be able to swing the tube support member 4a up and down as will be described later. Therefore, the lever member 6 is not limited to the structure connected to the tube support member 4a via the shaft 4c. However, a recess may be formed at the tip of the lever lever member 6 and the shaft 4c may be engaged with the recess. Although not shown, a plurality of (for example, two to three) tube support members 4 a may be connected and swinged up and down by one lever lever member 6.

  The cam portion 9 can be engaged with the other end side of the lever lever member 6. The cam portion 9 is fixed to the rotary drive shaft 7, and is engaged with the other end side of the lever lever member 6 by driving the rotary drive shaft 7, and the other end side of the lever lever member 6 swings up and down. By doing so, the heat transfer tube 3 can be swung up and down via the tube support member 4.

  Both ends of the rotary drive shaft 7 protrude from the casing 7, and both protruding ends are supported by bearings 7 a and 7 b disposed outside the casing 7. Therefore, the drive source 8 of the rotary drive shaft 7 is also arranged outside the casing 7.

  The lever lever member 6 uses the principle of lever. In other words, the distance between the axis of the horizontal shaft 6b and the shaft 4c is set to be shorter than the distance between the axis of the horizontal shaft 6b and the engagement point of the cam portion 9, thereby increasing the force applied by the cam portion 9. A force can be applied to the tube support member 4a via the shaft 4c. Therefore, it is possible to reduce the load on the rotary drive shaft 7 and the drive source 8.

  A plurality of cam portions 9 are provided corresponding to each of the plurality of lever lever members 6, and the adjacent cam portions 9 are rotationally driven so that the plurality of tube support members 4 vibrate at different timings. The shaft is fixed to the rotary drive shaft 7 at different phase (angle) positions around the axis of the shaft 7. By shifting the timing of vibration applied to the plurality of tube support members 4, the load applied to the drive source 8 can be reduced, and the rotational drive shaft 7 can be reduced in weight as the load is reduced. Furthermore, if the dust of all the heat transfer tubes is dropped at once, the amount of dust is large, and the fallen dust may be clogged by the hopper or chute part below it, but by shifting the operation timing of each lever type lever member 6 The dust dropped from the heat transfer tube 3 can be dispersed. Further, by dispersing the dust falling from the heat transfer tube group 3, it is possible to suppress load fluctuations applied to the exhaust gas treatment facility on the downstream side due to the dust.

  The cam portion 9 is configured to be opened after the other end side of the lever lever member 6 is pushed down with the rotational drive of the rotational drive shaft 7. The lever lever member 6 having such a configuration causes the pipe support member 4a to drop after being lifted and collide with the support frame 5. At this time, the tube support member 4b is also slightly lifted through the horizontal tube 3a, then falls and collides with the support frame 5. The dust adhering to the heat transfer tube 3 is effectively shaken off by the impact at the time of collision of the tube support member 4a with the support frame 5. The heat transfer tube 3 is generally formed of a metal tube, and elastically deforms when the tube support member 4a is lifted. If the heat transfer tube 3 is suddenly released from the state where the heat transfer tube 3 is lifted through the tube support member 4a, the tube support member 4a is caused by the gravity acting on the tube support member 4a and the heat transfer tube 3 and the elastic restoring force of the heat transfer tube 3. , Accelerated vertically downward and collides with the support frame 5.

  As shown in FIG. 4, the casing 2 has a through-hole 2b of the rotary drive shaft 7 larger than the diameter of the rotary drive shaft 7, and the shaft seal member 7c of the rotary drive shaft 7 is attached so that the position can be adjusted. It has been. As shown in an enlarged view in FIG. 5, the shaft seal member 7 c includes a staffin box 7 c 1, a gland packing 7 c 2 housed in the staffin box 7 c 1, and a packing presser 7 c 3 that presses the gland packing 7 c 2. . The mounting flange 7c4 formed in the staffin box 7c1 is superposed on the flange 2c formed in the casing 2 and fastened with bolts and nuts. A long hole 2 d is formed in the flange 2 c of the casing 2. By using the long hole 2d, the mounting position of the shaft seal member 7c can be changed and fixed to the casing 2, so that the mounting position of the rotary drive shaft 7 to the casing 2 can be adjusted. As a result, the engagement position between the cam portion 9 and the lever lever member 6 can be adjusted. By changing the engagement position (power point position) between the cam portion 9 and the lever lever member 6, the height for lifting the tube support member 4a can be changed, so that the impact force applied to the heat transfer tube 3 can be adjusted. . Although not shown in detail, the drive source 8 and the bearings 7a and 7b are also configured to be position adjustable together with the shaft seal member 7c.

  According to the dust removing device having the above-described configuration, only the rotary drive shaft 7 passes through the casing 2, sealing by an accordion is unnecessary, and sealing is easy.

  FIG. 6 is a longitudinal sectional view showing a second embodiment of the dust removing apparatus according to the present invention. The dust removing device 1 is a device that removes dust attached to a heat transfer tube 3 disposed in a casing 2 of a boiler or heat exchanger that recovers heat from a gas containing dust. In FIG. 6, the combustion gas G containing dust flows in the direction of the arrow in the figure.

  The heat transfer tube 3 is formed in a meandering manner by connecting a group of horizontal tubes 3a arranged at predetermined intervals in the vertical direction by a U-shaped tube portion 3b, and both end portions 3e and 3f are directed to one side in the horizontal tube length direction. It penetrates the casing 2. In the end portions 3e and 3f, the heat exchange medium is introduced from one end portion, and the heat exchange medium exchanged with the combustion gas G is discharged from the other end portion. A plurality of heat transfer tubes 3 formed in a meandering manner are arranged in parallel in the horizontal direction (depth direction in FIG. 6, see FIG. 2) to form a heat transfer tube group 3.

  The horizontal tube group 3a of the heat transfer tubes 3 is supported by tube support members 4a and 4b on both sides in the horizontal tube length direction. The tube support members 4a and 4b are detachably mounted on a support frame 5 fixed horizontally in the casing 2. The tube support members 4a and 4b are provided for each heat transfer tube 3 of the heat transfer tube group, similarly to the first embodiment (FIG. 2).

  A hole at the upper end of the tube support member 4a and a long hole 6a (see FIG. 7) on one end side of the lever lever member 6 are rotatably connected by a shaft 4c. The lever lever member 6 passes through an opening 2 a formed in the casing 2, and the other end side of the lever lever member 6 extends to the outside of the casing 2. The lever lever member 6 is rotatably supported by a horizontal shaft 6e fixed to the casing 2 with a rotation fulcrum disposed at the position of the opening 2a of the casing 2.

  A rotational drive shaft 7 is disposed outside the casing 2. The rotational drive shaft 7 is rotationally driven by a drive source (not shown) such as a motor fixed to the wall surface of the casing 2. The rotary drive shaft 7 can be supported by a bearing (not shown) fixed to the outer wall of the casing 2.

  The rotation drive shaft 7 is provided with a cam portion 9, which acts on the other end side of the lever lever member 6 by driving the rotation drive shaft 7, and the other end side of the lever lever member 6. Is swung up and down to swing the heat transfer tube group 3 up and down via the lever lever member 6 and the tube support member 4.

  The cam portion 9 can swing the other end side of the lever lever member 6 up and down as the rotary drive shaft 7 rotates.

  As a desirable mode, a plurality of cam portions 9 are provided corresponding to each of the plurality of lever lever members 6, and the cam portions 9 are different so that the plurality of tube support members 4 vibrate at different timings. It is fixed to the rotary drive shaft 7 at the phase (angle) position. By shifting the timing of vibration applied to the plurality of tube support members 4, the load applied to the drive source 8 can be reduced, and the rotational drive shaft 7 can be reduced in weight as the load is reduced. Furthermore, if the dust of all the heat transfer tubes is dropped at once, the amount of dust is large, and the fallen dust may be clogged by the hopper or chute part below it, but by shifting the operation timing of each lever type lever member 6 The dust dropped from the heat transfer tube 3 can be dispersed. Further, by dispersing the dust falling from the heat transfer tube group 3, it is possible to suppress load fluctuations applied to the exhaust gas treatment facility on the downstream side due to the dust.

  Furthermore, the cam part 9 is comprised so that it may open | release after pushing down the other end side of the lever-type lever member 6 with the rotational drive of the rotational drive shaft 7 as a desirable form. The lever lever member 6 having such a configuration causes the pipe support member 4a to drop after being lifted and collide with the support frame 5. At this time, the tube support member 4b is also slightly lifted through the horizontal tube group 3a, then falls and collides with the support frame 5. Due to the impact at the time of the collision, the dust adhering to the heat transfer tube 3 is effectively shaken off. The heat transfer tube 3 is generally formed of a metal tube, and elastically deforms when the tube support member 4a is lifted. If the heat transfer tube 3 is suddenly released from the state where the heat transfer tube 3 is lifted through the tube support member 4a, the tube support member 4a is caused by the gravity acting on the tube support member 4a and the heat transfer tube 3 and the elastic restoring force of the heat transfer tube 3. , Accelerated vertically downward and collides with the support frame 5.

  Further, as indicated by an arrow X in FIG. 7, the cam portion 9 is preferably provided so that the force point position with the lever lever member 6 can be adjusted, for example, by being provided so as to be horizontally movable in the front-rear direction. By changing the power point position between the cam portion 9 and the lever lever member 6, the height of the action point, that is, the drop height of the tube support member 4a can be changed, so that the impact force applied to the heat transfer tube 3 is adjusted. can do.

  The tube support members 4 a and 4 b desirably include a cylindrical protection member 10 that grips the peripheral surface of the heat transfer tube 3. The protection member 10 has a certain length dimension along the heat transfer tube 3, and by holding the periphery of the heat transfer tube 3 over a predetermined length in the length direction of the heat transfer tube 3, It is possible to prevent the heat transfer tube 3 from being damaged by dispersing the impact force so that no local force acts on the heat transfer tube 3.

  The lever lever member 6 is integrally formed with a boss portion 6d. A boss 6d is rotatably fitted on a horizontal shaft 6e fixed to the casing 2 and a shaft seal member 6f is disposed so as to close a gap between the boss 6d and the opening 2a. . The shaft sealing member 6f presses the gland packing 6f2 by pressing the side face of the staffin box 6f1 fixed to the opening 2a of the casing 2, the gland packing 6f2 accommodated in the staffin box 6f1, and the gland packing 6f2. A packing presser 6f3 that is in sliding contact with the peripheral surface of the boss 6d. According to such a sealing structure, the sealing member using the bellows is not necessary.

  According to the dust removing device of the second embodiment having the above-described configuration, it is the lever lever members 6 corresponding to the number of the heat transfer tube groups 3 that penetrate the casing 2, and the casing penetration location is set for each horizontal tube 3 a. Since it is not necessary to provide in a casing, a casing penetration location can be decreased. Further, since the rotation fulcrum of the lever lever member 6 is disposed at the position of the opening 2a provided in the casing 2, the driving range of the through portion can be reduced with respect to the vibration amplitude of the heat transfer tube 3, As a result, it can be easily sealed with the shaft seal member.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Dust removal apparatus 2 Casing 2a Opening part 3 Heat exchanger tube 4a Tube support member 5 Support frame 6 Lever type lever member 7 Rotation drive shaft 8 Drive source 9 Cam part 10 Protection member

Claims (6)

An apparatus for removing dust adhering to a heat transfer tube disposed in a casing of a boiler or heat exchanger that recovers heat from a gas containing dust,
A plurality of heat transfer tubes penetrating the casing are formed by connecting horizontal tube groups arranged at intervals in the vertical direction in a meandering manner with U-shaped tube portions and having both end portions directed to one side in the horizontal tube length direction. A group of heat transfer tubes arranged in parallel at intervals in the lateral direction;
Provided corresponding to each heat transfer tube of the heat transfer tube group, supporting the other side in the horizontal tube length direction of the horizontal tube group of each heat transfer tube, and supported in a detachable manner on a support frame fixed in the casing. A plurality of tube support members;
A drive source arranged outside the casing;
A rotary drive shaft that extends horizontally through the casing and is driven to rotate by the drive source;
A plurality of cam portions provided on the rotary drive shaft in the casing;
A lever member that is swingably supported around a horizontal axis in the casing and is swung by the cam portion to swing the tube support member up and down;
A dust removing device comprising: An apparatus for removing dust adhering to a heat transfer tube disposed in a casing of a boiler or heat exchanger that recovers heat from a gas containing dust,
A plurality of heat transfer tubes penetrating the casing are formed by connecting horizontal tube groups arranged at intervals in the vertical direction in a meandering manner with U-shaped tube portions and having both end portions directed to one side in the horizontal tube length direction. A group of heat transfer tubes arranged in parallel at intervals in the lateral direction;
Provided corresponding to each heat transfer tube of the heat transfer tube group, supporting the other side in the horizontal tube length direction of the horizontal tube group of each heat transfer tube, and supported in a detachable manner on a support frame fixed in the casing. A plurality of tube support members;
A drive source arranged outside the casing;
A rotational drive shaft that extends horizontally outside the casing and is rotationally driven by the drive source;
A plurality of cam portions provided on the rotary drive shaft;
A lever-type lever member that penetrates the casing and is supported so as to be swingable about a horizontal axis, and is swung by the cam portion to swing the tube support member up and down;
The dust removing, wherein the horizontal shaft for swingably supporting the lever lever member is disposed in the opening so as to airtightly close the opening formed in the wall of the casing. apparatus. The plurality of cam portions are arranged with the positions around the axis of the rotary drive shaft shifted so as to swing the plurality of tube support members at different timings. Dust removal device. The rotary drive shaft passes through the casing via a shaft seal member;
2. The dust removing device according to claim 1, wherein the shaft sealing member is attached to the casing so that the position of the shaft sealing member can be adjusted so that the engagement position between the cam portion and the lever lever member can be adjusted. . The shaft seal member includes: a gland packing arranged in an airtight manner around the rotary drive shaft; a staffin box that accommodates the gland packing; and a packing presser that presses the gland packing into the staffin box. Prepared,
The dust according to claim 4, wherein the staffin box is fixed to the casing by a fastening member, and one or both fastening member insertion holes of the staffin box and the casing are formed as long holes. Removal device. The dust removing device according to claim 2, wherein the rotation drive shaft is provided so that an engagement position between the cam portion and the lever lever member can be adjusted.

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