JP2019090558A - Air nozzle and boiler including the same and air nozzle removal method - Google Patents

Abstract

To provide an air nozzle which enables easy repair or replacement of a nozzle part.SOLUTION: An air nozzle 100 includes: a nozzle part 10 rotatably connected to a horizontal rotary shaft 11 and a vertical rotary shaft 12; a closing plate 20 which closes an opening formed at a casing; a support frame fixed to the closing plate 20 and supporting the horizontal rotary shaft 11 and the vertical rotary shaft 12; a first adjustment rod 40 which adjusts a vertical rotation angle θ1 of the nozzle part 10; a first transmission part 50 which transmits driving force for moving the first adjustment rod 40 forward and rearward to the first adjustment rod 40; a second adjustment rod 60 which adjusts a horizontal rotation angle of the nozzle part 10; a second transmission part 70 which transmits driving force for moving the second adjustment rod 60 forward and rearward to the second adjustment rod 60; and a fixing pin which fixes a position of the first adjustment rod 40 so that an angle made by the axis X relative to a horizontal direction becomes a predetermined angle.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an air nozzle, a boiler equipped with the same, and a method of removing the air nozzle.

BACKGROUND ART Conventionally, there is known an air box nozzle provided with a first beam capable of rotating horizontally and horizontally and a second beam capable of rotating the nozzle vertically and vertically (see, for example, Patent Document 1).
The air box nozzle disclosed in Patent Document 1 horizontally rotates by rotating in a horizontal direction about the first beam, and moves up and down by rotating in a vertical direction about the second beam. Rotate in the direction.

Japanese Utility Model 2-16132

  In the wind box nozzle disclosed in Patent Document 1, the upper and lower ends of the first beam are supported by the fixing portion of the wind box. Therefore, when the air box nozzle is damaged or burned, the air box nozzle can not be removed from the air box for repair or replacement. In addition, when the tilt link connected to the first beam is removed, the air box nozzle is inclined vertically downward by its own weight, and can not be pulled out and removed from the air box side. Therefore, in order to repair or replace the air box nozzle, it is necessary to set up a scaffold inside the furnace of the boiler and allow a worker to remove the air box nozzle using the scaffold. However, it is not easy to repair or replace the wind box nozzle at an appropriate time because the work of installing the scaffold inside the furnace is very complicated and time-consuming.

  This indication is made in view of such a situation, and can repair or replace easily the nozzle part rotatably connected with both a horizontal rotation axis and a vertical rotation axis. It is an object of the present invention to provide an air nozzle, a boiler equipped with the same, and a method of removing the air nozzle.

In order to solve the above-mentioned subject, this indication adopts the following means.
The air nozzle according to one aspect of the present disclosure is formed in a tubular shape along an axis in a direction in which air is blown out, and intersects the axis with a horizontal pivot axis extending horizontally and intersecting the axis. A nozzle portion rotatably connected to a vertical rotation axis extending in the vertical direction; and a closing plate which is detachably attached to a casing for introducing air to the nozzle portion and which closes an opening formed in the casing. A support frame fixed to the closing plate and supporting the horizontal rotation shaft and the vertical rotation shaft, and one end portion connected to the vertical rotation shaft, and a second of the nozzle portion with respect to the horizontal rotation shaft (1) A first adjusting rod for adjusting a rotation angle, and a first transmission portion connected to the other end of the first adjusting rod and transmitting a driving force for advancing and retracting the first adjusting rod to the first adjusting rod When The one end portion is connected to the horizontal rotation axis provided with the rotation axis in the direction orthogonal to the vertical rotation axis, and the second rotation angle of the nozzle portion with respect to the vertical rotation axis is adjusted An adjusting rod, a second transmitting portion connected to the other end of the second adjusting rod and transmitting a driving force for advancing and retracting the second adjusting rod to the second adjusting rod, and the axis is horizontal And a fixing mechanism for fixing the position of the first adjusting rod such that the angle is a predetermined angle.

According to the air nozzle according to the aspect of the present disclosure, the closing plate is detachably attached to the opening of the casing, and supports the horizontal rotation axis and the vertical rotation axis that rotatably connects the nozzle portion. The support rack is fixed to the closing plate. Therefore, when removing the nozzle portion from the casing together with the closing plate and the support stand, it is not necessary to set up a scaffold inside the furnace of the boiler. The first rotation angle of the nozzle portion with respect to the horizontal rotation axis is adjusted by transmitting the driving force from the first transmission portion to the first adjustment rod. During maintenance work of the nozzle unit, etc., when the transmission of the driving force from the first transmission unit to the first adjustment rod is released to remove the air nozzle from the casing, the nozzle unit rotates horizontally downward by its own weight. If the air nozzle can not be removed from the casing, the air nozzle can not be removed from the casing because it is pivoted downward about the axis and contacts or hooks on the casing. Therefore, the position of the first adjustment rod is fixed by the fixing mechanism such that the angle formed by the axis extending the nozzle portion with the horizontal direction is a predetermined angle. Therefore, when removing a nozzle part from a casing with a block board and a support stand, the malfunction which a nozzle part contacts a casing can be prevented.
As described above, according to the air nozzle according to the aspect of the present disclosure, it is possible to easily repair or replace the nozzle portion rotatably connected to both the horizontal rotation axis and the vertical rotation axis.

In the air nozzle according to one aspect of the present disclosure, the first transmission portion may be a first link lever portion whose one end portion is connected to the other end portion of the first adjustment rod, and the other of the first link lever portion. A first drive shaft connected to the end and rotating the first link lever around the other end of the first link lever, and attached to the closing plate and rotatable the first drive shaft And the fixing mechanism may be a mechanism for fixing the first drive shaft so as not to rotate with respect to the bearing.
The fixing mechanism prevents the first drive shaft from rotating with respect to the bearing portion attached to the closing plate, so that the angle between the axis extending the nozzle portion and the horizontal direction becomes a predetermined angle. The position can be fixed.

In the above air nozzle, a lever portion connected to the first drive shaft and having a through hole formed therein, and a scale connected to the bearing portion and measuring a rotation angle of the lever portion are displayed The scale plate may be provided, and the fixing mechanism may be a shaft-like member inserted into both the through hole formed in the lever portion and the insertion hole formed in the scale plate.
By doing this, the fixing mechanism is formed in the insertion hole of the scale plate and the lever portion on which the scale for measuring the rotation angle of the lever portion corresponding to the first rotation angle with respect to the horizontal rotation axis is displayed. The through hole can be used to easily fix the position of the first adjustment rod.

The air nozzle according to an aspect of the present disclosure includes an installation portion attached to the bearing portion and capable of installing a balance weight for balancing the weight of the nozzle portion and the support rack with respect to the blocking plate. It may be
By doing this, the balance weight is placed and adjusted so that the weight on the installation portion side of the closing plate and the weight on the support rack frame are balanced, and the balance weight is placed at the same time and the nozzle of the closing plate The weight on the part side and the weight on the upstream side of the air blowing can be adjusted to be balanced. Therefore, when removing a blocking plate with a nozzle part and a support stand from a casing, conveyance of a blocking plate and a support stand becomes easy.

In the air nozzle according to the aspect of the present disclosure, a pair of first connection shafts whose one end is connected to the vertical rotation shaft and a pair of the other ends of the pair of first connection shafts are connected to both ends The vertical rotation shaft, the pair of first connection shafts, and the second connection shaft form a four-bar rotation chain mechanism, and the horizontal rotation shaft is formed according to the second rotation angle. It is possible to change each of the mounting angle of the first connecting shaft with respect to the first connecting shaft and the mounting angle of the second connecting shaft with respect to the first connecting shaft, and the one end of the first adjusting rod is the second connecting shaft It may be linked to
When the horizontal rotation axis of the nozzle portion rotates in the left and right direction around the vertical rotation axis, the attachment mechanism of the first connection axis with respect to the horizontal rotation axis and the second connection axis with respect to the first connection axis by the link mechanism. It is possible to change the mounting angle of each of the first and second adjusting rods, and appropriately maintain the state in which the driving force is transmitted from the first adjusting rod to the vertical rotation shaft.

In the air nozzle according to one aspect of the present disclosure, an engagement portion engageable with a suspension mechanism is attached to a second surface opposite to the first surface to which the support rack of the blocking plate is attached. Good.
By so doing, it is possible to suspend by the suspension mechanism together with the nozzle portion and the support rack with the closing plate and to carry it by removing it from the casing.

A boiler according to an aspect of the present disclosure includes the air nozzle described in any of the above.
According to the boiler concerning one mode of this indication, repair or exchange of a nozzle part of an air nozzle rotatably connected with both a horizontal rotation axis and a vertical rotation axis can be performed easily.

A method of removing an air nozzle according to an aspect of the present disclosure is a method of removing an air nozzle from a casing, wherein the air nozzle is formed in a tubular shape along an axis in a direction of blowing out air and the axis. And a nozzle portion rotatably connected to a horizontal rotation axis extending in the horizontal direction intersecting the axis and a vertical rotation axis extending in the vertical direction intersecting the axis, and introducing air to the nozzle portion A casing, a closing plate detachably attached to the casing and closing an opening formed in the casing, a support fixed to the closing plate and supporting the horizontal rotation shaft and the vertical rotation shaft A frame, a first adjustment rod having one end connected to the vertical rotation shaft and adjusting a first rotation angle of the nozzle portion with respect to the horizontal rotation shaft, and the first adjustment A first transmission portion connected to the other end of the rod and transmitting a driving force for advancing and retracting the first adjustment rod to the first adjustment rod, and a rotation axis in a direction orthogonal to the vertical rotation axis A second adjustment rod having one end connected to the horizontal rotation axis and adjusting a second rotation angle of the nozzle with respect to the vertical rotation axis; and the other end of the second adjustment rod And a second transmission portion connected to the second adjustment rod and transmitting a driving force for moving the second adjustment rod back and forth, and the first axis is formed so that the angle between the axis and the horizontal direction is a predetermined angle. And fixing the position of the adjusting rod, removing the closing plate from the casing, and pulling out the air nozzle removed from the casing.
By doing this, it is possible to easily repair or replace the nozzle portion rotatably connected to both the horizontal rotation axis and the vertical rotation axis.

  According to the present disclosure, it is possible to provide an air nozzle and a method of removing the same capable of easily repairing or replacing the nozzle portion rotatably connected to both the horizontal rotation axis and the vertical rotation axis. .

It is a longitudinal cross-sectional view which shows the turning combustion boiler of this embodiment. It is a cross-sectional view which shows the auxiliary air injection | throwing-in part of FIG. It is the elements on larger scale of the auxiliary air nozzle shown in FIG. It is the figure which saw the auxiliary air nozzle shown in FIG. 3 from the side. FIG. 5 is a view of the auxiliary air nozzle shown in FIG. 4 as viewed from the outside of the casing. FIG. 6 is a cross-sectional view of the auxiliary air nozzle shown in FIG. It is the elements on larger scale of the auxiliary air nozzle shown in FIG. 2, and is a figure explaining the process of removing an auxiliary air nozzle from a casing. It is the elements on larger scale of the auxiliary air nozzle shown in FIG. 2, and is a figure explaining the process of removing an auxiliary air nozzle from a casing. It is the elements on larger scale of the auxiliary air nozzle shown in FIG. 2, and is a figure explaining the process of removing an auxiliary air nozzle from a casing. It is a figure which shows the state which hung the closing board of the auxiliary | assistant air nozzle by the suspension mechanism. It is the elements on larger scale of the auxiliary air nozzle of 2nd Embodiment. It is II-II arrow sectional drawing of the auxiliary air nozzle shown in FIG. It is the elements on larger scale of the auxiliary air nozzle of 3rd Embodiment. It is a figure which shows the state which rotated the nozzle part of the auxiliary | assistant air nozzle shown in FIG. 13 to the horizontal direction.

First Embodiment
Hereinafter, the auxiliary air nozzle 100 according to the first embodiment of the present disclosure will be described with reference to the drawings.
In the present embodiment, an auxiliary air nozzle 100 applied to a swirl combustion boiler will be described.
In the present embodiment, the upper side indicates the direction of the vertically upper side, and the lower side indicates the direction of the vertically lower side.
In this embodiment, for example, in the swirl combustion boiler 300 as shown in FIG. 1 and FIG. 2, by providing the auxiliary air input portion 330 above the burner portion 320 of the furnace 310, air is injected into the furnace 310 in multiple stages. By doing this, the region from the burner unit 320 to the auxiliary air input unit 330 is made into a reducing atmosphere to reduce NOx of the combustion exhaust gas.

  As shown in FIG. 1, the burner unit 320 is a mixture of pulverized coal (solid fuel such as powdery coal) and primary air for transfer and a plurality of solid fuels for charging secondary air for combustion into the furnace 310. A boil burner 321 is provided. The solid fuel fired burner 321 is connected to a pulverized coal mixture transport pipe 322 for transporting pulverized coal with primary air and an air feed duct 323 for supplying secondary air. The swirl combustion boiler 300 employs a swirl combustion method in which a solid fuel burning burner 321 for charging pulverized coal and air into the furnace 310 is disposed at each corner of each stage, for example.

  As shown in FIG. 1, the auxiliary air charging unit 330 supplies a plurality of auxiliary air nozzles 100 for charging the furnace 310 with auxiliary air that completely burns the unburned pulverized coal flowing from the burner unit 320 to the downstream of the combustion gas. Equipped with An air supply duct 323 for supplying secondary air is connected to the auxiliary air nozzle 100. As shown in FIG. 2, the main flow rate of the secondary air supplied from the air supply duct 323 is supplied to the solid fuel fired burner 321, and the remaining flow rate of the secondary air is supplied from the casing 200 to the auxiliary air nozzle 100. The swirling combustion boiler 300 adopts a swirling combustion method in which the auxiliary air nozzles 100 are disposed at each corner of each stage. In addition, a boiler is not limited to the turning combustion boiler by which a burner part is arrange | positioned at each corner part.

Next, the auxiliary air nozzle 100 of the present embodiment will be described.
As shown in FIGS. 3 and 4, the auxiliary air nozzle 100 according to the present embodiment includes the nozzle portion 10, the closing plate 20, the support rack 30, the first adjustment rod 40, the first transmission portion 50, and A second adjustment rod 60, a second transmission unit 70, and a fixing pin (fixing mechanism) 80 described later are provided.

FIG. 3 is a partially enlarged view of the auxiliary air nozzle 100 shown in FIG. FIG. 3 is a view of the auxiliary air nozzle 100 as viewed from above in the vertical direction. The nozzle portion 10 is formed in a cylindrical shape along an axis X in which the secondary air is blown out, and in FIG. 3, the nozzle portion 10 shown by a phantom line corresponds to the nozzle portion 10 shown by a solid line. The state which rotated only the horizontal rotation angle (2nd rotation angle) (theta) 2 around the vertical rotation axis 12 is shown.
FIG. 4 is a side view of the auxiliary air nozzle shown in FIG. In FIG. 4, the nozzle unit 10 indicated by an imaginary line shows a state in which the vertical rotation angle (first rotation angle) θ1 is rotated around the horizontal rotation axis 11 with respect to the nozzle unit 10 indicated by a solid line. .

  The nozzle portion 10 is a member formed in a tubular shape along the axis X, and is disposed facing the furnace 310. The nozzle portion 10 is rotatably connected to a horizontal rotation shaft 11 extending in the horizontal direction so as to intersect the axis X. The horizontal direction of the nozzle portion 10 is set by a horizontal rotation angle θ2 around the vertical rotation axis 12. Further, the direction of the nozzle portion 10 in the vertical direction is set by a vertical rotation angle θ1 around the horizontal rotation axis 11.

  The casing 200 introduces secondary air to the nozzle unit 10. The closing plate 20 is a plate-like member that closes the opening 201 formed in the casing 200. For example, in the closing plate 20, a fastening bolt (not shown) is inserted into each of a plurality of through holes (not shown) formed in the periphery of the closing plate 20, and a plurality of casings 200 formed in the periphery of the opening 201 A fastening bolt is fastened to a fastening hole (not shown) and attached to the casing 200. The closing plate 20 is removed from the casing 200 by releasing the fastening bolt. Thus, the closing plate 20 is detachably attached to the casing 200.

  The support rack 30 is a member fixed to one surface of the closing plate 20 on the inner side of the casing 200. The support rack 30 rotatably supports the horizontal rotation shaft 11 and the vertical rotation shaft 12. The horizontal rotation shaft 11 and the vertical rotation shaft 12 are not directly fixed to the casing 200, but are supported by the support rack 30. Therefore, the nozzle portion 10 of the auxiliary air nozzle 100 can be removed from the casing 200 by removing the support rack 30 from the casing 200 together with the closing plate 20.

  The first adjustment rod 40 is a shaft-like member that adjusts the vertical rotation angle θ1 with respect to the horizontal rotation shaft 11 whose rotation axis is provided in the direction orthogonal to the vertical rotation shaft 12 of the nozzle portion 10. As shown in FIGS. 3 and 4, one end 40 a of the first adjustment rod 40 is connected to the nozzle unit 10 via the universal joint 41.

The first transmission unit 50 is a mechanism for transmitting a driving force for advancing and retracting the first adjustment rod 40 to the first adjustment rod 40, and is connected to the other end 40 b of the first adjustment rod 40. As shown in FIGS. 3 and 4, the first transmission unit 50 includes a first link lever 51, a first drive shaft 52, and a bearing 53 described later.
One end of the first link lever 51 is connected to the other end 40 b of the first adjustment rod 40, and the other end of the first link lever 51 is connected to the first drive shaft 52.

  The first drive shaft 52 is a shaft-shaped member connected to the other end of the first link lever 51 and rotating the first link lever 51 around the other end of the first link lever 51. The driving force for rotating the first drive shaft 52 is transmitted from the drive source (not shown) to the end of the first drive shaft 52 on the outer side of the casing 200.

  The second adjustment rod 60 is a shaft-like member that adjusts the horizontal rotation angle θ2 with respect to the vertical rotation shaft 12 provided with a rotation axis in the direction orthogonal to the horizontal rotation shaft 11 of the nozzle portion 10. As shown in FIGS. 3 and 4, one end 60 a of the second adjustment rod 60 is connected to the horizontal rotation shaft 11 via the rib 61.

The second transmission unit 70 is a mechanism for transmitting a driving force for moving the second adjustment rod 60 back and forth to the second adjustment rod 60, and is connected to the other end 60 b of the second adjustment rod 60. As shown in FIGS. 3 and 4, the second transmission unit 70 includes a second link lever 71 and a second drive shaft 72.
One end of the second link lever 71 is connected to the other end 60 b of the second adjustment rod 60, and the other end of the second link lever 71 is connected to the second drive shaft 72.

  The second drive shaft 72 is an axial member connected to the other end of the second link lever 71 and rotating the second link lever 71 about the other end of the second link lever 71. The driving force for rotating the second drive shaft 72 is transmitted from the drive source (not shown) to the end of the second drive shaft 72 on the outer side of the casing 200.

Next, the fixing pin 80 provided in the auxiliary air nozzle 100 of the present embodiment will be described.
In the fixing pin 80 shown in FIGS. 5 and 6, the vertical rotation angle .theta.1 which is an angle that the axis X extending in the direction in which the nozzle portion 10 blows off secondary air makes with the horizontal direction is 0 degree (horizontal direction) Is a mechanism for fixing the position of the first adjustment rod 40.
FIG. 5 is a view of the auxiliary air nozzle shown in FIG. 4 as seen from the outside of the casing 200. 6 is a cross-sectional view of the auxiliary air nozzle 100 shown in FIG.

As shown in FIG. 6, the first transmission unit 50 includes a bearing 53 attached to the closing plate 20 and rotatably supporting the first drive shaft 52. Further, as shown in FIGS. 5 and 6, the first transmission unit 50 includes a lever portion 54 and a scale plate 55.
The lever portion 54 is a member connected to the first drive shaft 52 and having a through hole 54a. The scale plate 55 is a plate-like member that is connected to and fixed to the bearing portion 53, displays a scale for measuring the rotation angle of the lever portion 54, and has strength. The scale plate 55 is formed with an insertion hole 55 a into which the fixing pin 80 is inserted.

  As shown in FIG. 6, the fixing pin 80 is an axial member inserted into both the through hole 54 a formed in the lever portion 54 and the insertion hole 55 a formed in the scale plate 55. The lever portion 54 is fixed to the scale plate 55 by inserting the fixing pin 80 into both the through hole 54 a and the insertion hole 55 a. Here, the scale plate 55 is fixed via the bearing portion 53 attached to the closing plate 20, and the lever portion 54 is connected to the first drive shaft 52. Therefore, the fixing pin 80 is inserted into both the through hole 54 a and the insertion hole 55 a to fix the lever portion 54 and the scale plate 55 so that the first drive shaft 52 does not rotate with respect to the bearing portion 53. Mechanism.

  As shown in FIG. 5, the lever portion 54 is connected to the connection bar 57 via the link shaft 56. The connection bar 57 is a shaft-like member that moves in the vertical direction by a driving force transmitted from a driving source (not shown), and is connected to the lever portion of another auxiliary air nozzle. By connecting the lever portions of the plurality of auxiliary air nozzles to the same connection bar 57, the vertical rotation angles θ1 about the horizontal rotation axes of the plurality of auxiliary air nozzles can be made to coincide and rotate.

Next, a method of removing the auxiliary air nozzle 100 of the present embodiment from the casing 200 will be described with reference to FIGS. 5 to 9.
7 to 9 are partial enlarged views of the auxiliary air nozzle shown in FIG. 2 and are diagrams for explaining the process of removing the auxiliary air nozzle from the casing.

In the first step, the worker fixes the position of the first adjustment rod 40 so that the vertical rotation angle θ1 of the nozzle unit 10 becomes 0 degree (horizontal direction). As shown in FIGS. 5 and 6, the operator inserts the through holes 54 a formed in the lever portion 54 and the scale plate 55 so that the first drive shaft 52 does not rotate with respect to the bearing portion 53. Fixing pins 80 are inserted into both of the holes 55a.
Here, the position of the first adjustment rod 40 is fixed so that the vertical rotation angle θ1 is 0 degree (horizontal direction), but may be another predetermined angle other than 0 degree. In this case, the predetermined angle can be set to an arbitrary angle in the range of the angle at which the nozzle unit 10 does not contact the casing 200.

  In the second step, the operator switches the connected state in which the lever portion 54 and the link shaft 56 are connected to a non-connected state in which the lever portion 54 and the link shaft 56 are not connected. Since the position of the first adjustment rod 40 is fixed in the first step, the position of the first adjustment rod 40 is fixed even if the driving force from the drive source is not transmitted to the lever portion 54 in the second step. It is maintained in

  In the third step, the operator does not transmit the driving force to the driving source (not shown) or the second driving shaft 72 of the second transmission unit 70, and the axis X of the nozzle unit 10 is predetermined on the closing plate 20 side. The horizontal rotation angle θ2 around the vertical rotation shaft 12 is manually set so as to be inclined at an angle. The positions of the second drive shaft 72 and the second adjustment rod 60 are not affected by the gravity of the nozzle portion 10, and are in a semi-fixed state where they do not move unless a large external force is applied. The horizontal rotation angle θ2 which is a predetermined angle shown in FIG. 7 is set to, for example, 10 degrees. Here, the horizontal rotation angle θ2 can be set to any angle as long as the auxiliary air nozzle 100 does not contact the inner peripheral surface of the casing 200 when the auxiliary air nozzle 100 is removed.

  In the fourth step, the worker removes the fastening bolt that fastens the closing plate 20 to the casing 200 so that the closing plate 20 can be removed from the casing 200. Then, as shown in FIG. 8, the worker can open the closing plate 20 around the vertical rotation shaft 12 so that the auxiliary air nozzle 100 does not contact the inner circumferential surface of the casing 200. Rotate in the direction away from. As shown in FIG. 8, for example, assuming that the flow direction of auxiliary air from the casing 200 to the furnace 310 is the axis Y, and the axis parallel to the closing plate 20 is the axis Z, an arrow from the axis Y to the axis Z You may rotate along.

In the fifth step, as shown in FIG. 9, the operator confirms that the nozzle portion 10 is not in contact with the casing 200 even if the auxiliary air nozzle 100 is closed and pulled out in the direction of the axis Z parallel to the plate 20. . After confirming that it is not in contact, the auxiliary air nozzle 100 is pulled out in the direction away from the opening 201 of the casing 200 along the axis Z, and the auxiliary air nozzle 100 removed from the casing 200 to a predetermined storage location Transport.
As shown in FIG. 9, when the auxiliary air nozzle 100 is pulled away from the opening 201 of the casing 200 along the axis Z, the auxiliary air nozzle 100 does not contact the furnace wall (not shown) of the furnace 310.

  Although the method of removing the auxiliary air nozzle 100 described above has not been described with reference to the method of holding the auxiliary air nozzle 100 by the operator, if the auxiliary air nozzle 100 is not small and heavy, the casing may not be used. Although a temporary loading platform (not shown) is installed outside of 200 to manually remove it from the casing 200, it may be another mode. For example, the auxiliary air nozzle 100 may be removed in a suspended state by the suspending mechanism 400.

  10, for example, an eye plate (engagement portion) 21 is joined to a plurality of locations of the closing plate 20 by welding or the like, and the suspension mechanism 400 is supported by the eye plate 21 with a boiler mount (not shown) or the like. The wire 410 is engaged and suspended. The operator does not have to support the entire weight of the auxiliary air nozzle 100 when performing an operation of engaging the wire 410 with the eye plate 21 or an operation of pulling out the auxiliary air nozzle 100.

The operation and effects exerted by the auxiliary air nozzle 100 of the present embodiment described above will be described.
According to the auxiliary air nozzle 100 of the present embodiment, the closing plate 20 is detachably attached to the opening portion 201 of the casing 200, and the horizontal rotation shaft 11 and the vertical rotation which connect the nozzle portion 10 rotatably. A support rack 30 supporting the shaft 12 is fixed to the closing plate 20. Therefore, the nozzle plate 10 can be removed from the casing 200 to the outside of the furnace 310 together with the support rack 30 by the closing plate 20, and it is not necessary to set up a scaffold inside the furnace 310.

The vertical rotation angle θ1 of the nozzle unit 10 with respect to the horizontal rotation shaft 11 is adjusted by transmitting the driving force from the first transmission unit 50 to the first adjustment rod 40. When the transmission of the driving force from the first transmission unit 50 to the first adjustment rod 40 is canceled in order to remove the auxiliary air nozzle 100 from the casing 200, the nozzle unit 10 is directed downward by its own weight and downwardly about the horizontal pivot shaft 11. And the casing 200 contacts the casing 200, and the auxiliary air nozzle 100 can not be removed. Therefore, the position of the first adjustment rod 40 is fixedly supported so as not to move so that the angle between the axis X extending in the direction in which the secondary air blows out to the nozzle portion 10 with the horizontal direction by the fixing pin 80 is horizontal. ing. Therefore, when the blocking plate 20 is removed from the casing 200 together with the support rack 30, the nozzle portion 10 can be prevented from coming into contact with the casing 200.
As described above, according to the auxiliary air nozzle 100 of the present embodiment, repair or replacement of the nozzle portion 10 rotatably connected to both the horizontal rotation shaft 11 and the vertical rotation shaft 12 can be easily performed in a short time. It can be carried out.

  The fixing pin 80 of the present embodiment fixes the lever portion 54 and the scale plate 55 so that the first drive shaft 52 does not rotate with respect to the bearing portion 53 attached to the closing plate 20, thereby the nozzle portion 10. The first adjusting rod 40 can be fixedly supported so as not to move the position of the first adjusting rod 40 so that an angle formed by the axis X extending with the horizontal direction with the horizontal direction becomes 0 degree or a predetermined angle. Further, the fixing pin 80 is formed in the insertion hole 55a of the scale plate 55 and the lever portion 54 on which a scale for measuring the rotation angle of the lever portion 54 corresponding to the vertical rotation angle θ1 with respect to the horizontal rotation shaft 11 is displayed. The position of the first adjustment rod 40 can be easily fixed by inserting the through holes 54a into both the through holes 54a.

Second Embodiment
Next, an auxiliary air nozzle according to a second embodiment of the present disclosure will be described with reference to the drawings. The second embodiment is a modification of the first embodiment, and the description thereof will be omitted as it is the same as the first embodiment except in the case where it is particularly described below.
The auxiliary air nozzle 100A of the present embodiment has a setting portion 90 for setting the balance weight 500 for balancing with the weight of the support rack 30 on the outer surface of the casing 200 of the closing plate 20 in the first embodiment. It differs from the auxiliary air nozzle 100.

FIG. 11 is a partially enlarged view of the auxiliary air nozzle 100A of the second embodiment as viewed from above. FIG. 12 is a cross-sectional view of the auxiliary air nozzle 100A shown in FIG. 11, taken along the line II-II.
As shown in FIG. 11, the auxiliary air nozzle 100 </ b> A of the present embodiment includes an installation portion 90 attached to the bearing portion 53 of the first transmission portion 50. The installation portion 90 is disposed on the outside of the casing 200 opposite to the support base 30 with respect to the cover plate 20 in order to balance the weight of the support base 30 attached to the inner surface of the casing 200 of the cover plate 20. Be done. In addition, the balance weight 500 can be placed to adjust the weight on the nozzle side of the closing plate of the auxiliary air nozzle 100A and the weight on the upstream side of the air blowout of the closing plate to be balanced.

The upper surface of the installation unit 90 has a planar shape so that the balance weight 500 can be arranged above. As the balance weight 500, an arbitrary weight can be adopted so as to balance the weight of the support rack 30 and the weight of the nozzle unit 10 and the like supported by the support rack 30.
According to the present embodiment, it is possible to place the balance weight 500 and adjust the weight on the side of the mounting portion 90 of the closing plate 20 and the weight on the side of the support rack 30 to be balanced. Therefore, when the blocking plate 20 is removed from the casing 200 together with the nozzle portion 10 and the support rack 30, the blocking plate 20 can be easily transported together with the nozzle portion 10 and the support rack 30.

Third Embodiment
Next, an auxiliary air nozzle according to a third embodiment of the present disclosure will be described with reference to the drawings. The third embodiment is a modification of the first embodiment, and the description thereof will be omitted as it is the same as the first embodiment except in the case where it is particularly described below.

The auxiliary air nozzle 100 according to the first embodiment connects one end 40 a of the first adjustment rod 40 to the nozzle unit 10 via the universal joint 41. On the other hand, the auxiliary air nozzle 100 </ b> B of the present embodiment connects one end 40 a of the first adjustment rod 40 to the nozzle unit 10 via the link mechanism 42.
FIG. 13 is a partially enlarged view of the auxiliary air nozzle 100B of the present embodiment. FIG. 14 is a view showing a state in which the nozzle portion 10 of the auxiliary air nozzle shown in FIG. 13 is horizontally rotated.

  The link mechanism 42 included in the auxiliary air nozzle 100B of the present embodiment has a pair of first connection shafts 43 whose one end is connected to the vertical rotation shaft 12 and the other ends of the pair of first connection shafts 43 connected to both ends. The nozzle portion 10, the pair of first connection shafts 43 and the second connection shaft 44 form a four-joint rotation chain mechanism. Connecting portions with other members are rotatable at both ends of the first connecting shaft 43 and both ends of the second connecting shaft 44, respectively. As shown in FIGS. 13 and 14, one end 40 a of the first adjusting rod 40 is rotatably connected to the second connecting shaft 44.

  As shown in FIG. 14, in the link mechanism 42 of the present embodiment, the attachment angle α1 of the first connection shaft 43 to the horizontal rotation shaft 11 and the first connection shaft 43 in accordance with the horizontal rotation angle θ2 of the nozzle portion 10. This is a mechanism for changing the attachment angle α2 of the second connecting shaft 44. Therefore, even if the horizontal rotation angle θ2 of the nozzle unit 10 changes, there is no interference with the advance / retraction position of the first adjustment rod 40 by changing the attachment angles α1 and α2 according to the horizontal rotation angle θ2. The driving force is transmitted from the first adjusting rod 40 to the vertical rotation shaft 12, and the state of holding the vertical rotation angle θ1 can be appropriately maintained.

DESCRIPTION OF SYMBOLS 10 nozzle part 11 horizontal rotation axis 12 vertical rotation axis 20 closing plate 21 eye plate (engagement part)
Reference Signs List 30 support frame 40 first adjustment rod 40 a one end 40 b other end 41 universal joint 42 link mechanism 43 first connecting shaft 44 second connecting shaft 50 first transmission unit 51 first link lever 52 52 first drive shaft 53 bearing 54 lever portion 54a through hole 55 scale plate 55a insertion hole 56 link shaft 57 connection bar 60 second adjustment rod 60a one end portion 60b other end portion 61 rib 70 second transmission portion 71 second link lever portion 72 second drive shaft 80 fixed Pin (fixing mechanism)
90 installation part 100, 100A, 100B auxiliary air nozzle 200 casing 300 revolving combustion boiler 310 furnace 320 burner part 321 solid fuel fired burner 322 pulverized coal mixture transport pipe 323 air supply duct 330 auxiliary air input part 400 suspension mechanism 500 balance weight θ1 Vertical rotation angle (first rotation angle)
θ2 horizontal rotation angle (second rotation angle)

Claims (8)

A horizontal rotation axis is formed in a cylindrical shape along an axis that blows air, and extends horizontally in a horizontal direction intersecting the axis and rotating in a vertical rotation axis extending in a vertical direction that intersects the axis. A nozzle part which is connected in a possible manner;
A closing plate which is detachably attached to a casing for introducing air into the nozzle portion and which closes an opening formed in the casing;
A support frame fixed to the closing plate and supporting the horizontal rotation axis and the vertical rotation axis;
A first adjustment rod having one end connected to the vertical rotation axis and adjusting a first rotation angle of the nozzle portion with respect to the horizontal rotation axis;
A first transmission unit connected to the other end of the first adjustment rod and transmitting a driving force for advancing and retracting the first adjustment rod to the first adjustment rod;
The one end portion is connected to the horizontal rotation axis provided with the rotation axis in the direction orthogonal to the vertical rotation axis, and the second rotation angle of the nozzle portion with respect to the vertical rotation axis is adjusted With adjustment rod,
A second transmission unit connected to the other end of the second adjustment rod and transmitting a driving force for advancing and retracting the second adjustment rod to the second adjustment rod;
A fixing mechanism for fixing the position of the first adjusting rod such that the angle between the axis and the horizontal direction is a predetermined angle. The first transmission unit is
A first link lever portion having one end coupled to the other end of the first adjustment rod;
A first drive shaft connected to the other end of the first link lever and rotating the first link lever about the other end of the first link lever;
And a bearing portion attached to the closing plate and rotatably supporting the first drive shaft.
The air nozzle according to claim 1, wherein the fixing mechanism is a mechanism that fixes the first drive shaft so as not to rotate with respect to the bearing portion. A lever portion connected to the first drive shaft and having a through hole formed therein;
And a scale plate connected to the bearing portion and displaying a scale for measuring a rotation angle of the lever portion;
The air nozzle according to claim 2, wherein the fixing mechanism is an axial member inserted into both the through hole formed in the lever portion and the insertion hole formed in the dial plate.   The air nozzle according to claim 2, further comprising: a mounting portion mounted on the bearing portion and capable of mounting a balance weight for balancing the weight of the nozzle portion and the support rack with respect to the blocking plate. The nozzle portion includes a pair of first connection shafts whose one end is connected to the nozzle portion, and a second connection shaft whose other ends of the pair of first connection shafts are connected to both ends, the nozzle portion and the pair of The first connection shaft and the second connection shaft form a four-bar rotation chain mechanism, and the mounting angle of the first connection shaft with respect to the horizontal rotation shaft according to the second rotation angle and the first connection shaft It is possible to change the attachment angle of the second connecting shaft with respect to
The air nozzle according to claim 1, wherein the one end of the first adjustment rod is connected to the second connection shaft.   The engaging part which can be engaged with a suspending mechanism is attached to the 2nd surface opposite to the 1st surface to which the said support racket of the said closing plate is attached. Air nozzle as described in.   A boiler comprising the air nozzle according to any one of claims 1 to 6. A method of removing an air nozzle for removing an air nozzle from a casing, comprising:
The air nozzle is
A horizontal rotation axis is formed in a cylindrical shape along an axis that blows air, and extends horizontally in a horizontal direction intersecting the axis and rotating in a vertical rotation axis extending in a vertical direction that intersects the axis. A nozzle part which is connected in a possible manner;
A closing plate which is detachably attached to a casing for introducing air into the nozzle portion and which closes an opening formed in the casing;
A support frame fixed to the closing plate and supporting the horizontal rotation axis and the vertical rotation axis;
A first adjustment rod having one end connected to the vertical rotation axis and adjusting a first rotation angle of the nozzle portion with respect to the horizontal rotation axis;
A first transmission unit connected to the other end of the first adjustment rod and transmitting a driving force for advancing and retracting the first adjustment rod to the first adjustment rod;
A second adjustment for providing a rotation axis in a direction perpendicular to the vertical rotation axis and connecting one end to the horizontal rotation axis and adjusting a second rotation angle of the nozzle portion with respect to the vertical rotation axis With the rod,
A second transmission unit connected to the other end of the second adjustment rod and transmitting a driving force for advancing and retracting the second adjustment rod to the second adjustment rod;
Fixing the position of the first adjusting rod such that the angle between the axis and the horizontal direction is a predetermined angle;
Removing the closure plate from the casing;
And c. Pulling out the air nozzle removed from the casing.

Images