JP7144314B2 - Rotating structures and incinerators - Google Patents

Description

The present disclosure relates to rotating structures and incinerators using the same.

2. Description of the Related Art Conventionally, there is an industrial apparatus provided with a rotating structure that agitates an object by rotating a rotating body containing the object. Among them, as a particularly large industrial apparatus, Patent Literature 1 discloses a rotary incinerator in which waste such as municipal waste is supplied to a rotating cylindrical furnace body and incinerated.

A furnace body used in a rotary incinerator is a cylindrical body in which a plurality of axially extending water tubes are arranged at regular intervals in the circumferential direction. The water pipe circulates cooling water for cooling the furnace body. Cooling water flows through one of the water pipes in the direction from one opening side of the cylindrical body to the other opening side, and then returns by flowing in the other water pipe in the opposite direction. , circulating through each water pipe. These water pipes are connected to a rotary joint via a double connecting pipe, and introduce and discharge cooling water to and from the outside. The rotary joint is a bearing mechanism that rotatably supports the double connecting pipe according to the circumferential rotation of the furnace body.

Further, in the rotary incinerator, the posture of the furnace body is inclined so that the inlet side to which the waste is supplied is higher and the outlet side to which the incinerated ash and the like is discharged is lower. The double connecting pipe is installed on the lower side of the furnace body. That is, the double connecting pipe is installed outside the secondary combustion chamber from the furnace body side through the secondary combustion chamber for processing unburned gas installed downstream of the furnace body. It extends to the rotary joint. For this reason, the rotary joint is often supported by a stand separate from the stand that supports the furnace body.

JP-A-2005-114213

For example, it is assumed that the first frame that supports the furnace body and the second frame that supports the rotary joint are separately installed on the ground surface separately from each other as described above. In this case, when an earthquake occurs, the first frame and the second frame sway with mutually different vibration periods and amplitudes, causing a large relative displacement between the first frame and the second frame. At this time, the relative displacement is input as a forced displacement to the double connecting pipe, one end of which is connected to the furnace body on the first frame side and the other end of which is connected to the rotary joint on the second frame side, causing excessive displacement. Deformation and stress may occur. If the double communication pipe is damaged due to such deformation or the like, repair or replacement of the double communication pipe may be required.

Therefore, an object of the present disclosure is to provide a rotating structure and an incinerator that are advantageous in suppressing damage caused by an earthquake.

A rotating structure according to an aspect of the present disclosure includes a rotatable cylindrical body in which a pipe for circulating a fluid is arranged, a supply channel for supplying the fluid to the pipe, and a recovery channel for recovering the fluid from the pipe. A rotary joint that is connected to a coaxially laminated double connecting pipe and the opposite side of the double connecting pipe from the side that is connected to the pipe, and supports the double connecting pipe so that it can rotate according to the rotation of the cylindrical body. and a displacement mechanism including a first member and a second member movable in a direction perpendicular to the direction of connection with the first member, the first member being connected to the ground-side pedestal. , the second member is connected to the rotary joint.

In the rotating structure described above, the displacement mechanism may be a seismic isolation mechanism using sliding bearings. Alternatively, the displacement mechanism may be a seismic isolation mechanism using rolling bearings. Further, the rotating structure may include a shear pin having one end connected to the first member side and the other end connected to the second member side.

Further, an incinerator according to an aspect of the present disclosure is a rotary incinerator having a rotatable cylindrical body as a furnace body, comprising a rotating structure that includes the cylindrical body and rotates the cylindrical body, The object may be a rotating structure as described above.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a rotating structure and an incinerator that are advantageous in suppressing damage caused by an earthquake.

1 is a diagram showing the configuration of an incinerator according to an embodiment of the present disclosure; FIG. FIG. 2 is a side view of a supporting arrangement for a rotating structure according to an embodiment of the present disclosure; It is a figure explaining an example of the state of the rotating structure which concerns on one Embodiment after an earthquake occurrence. FIG. 4 is a side view of a supporting arrangement for a rotating structure according to another embodiment of the present disclosure;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Here, the dimensions, materials, and other specific numerical values shown in the embodiment are merely examples, and do not limit the present disclosure unless otherwise specified. Elements having substantially the same function and configuration are denoted by the same reference numerals to omit redundant description, and elements that are not directly related to the present disclosure are omitted from the drawings.

Further, in the embodiments shown below, the rotating structure of the present disclosure is provided in a rotary incinerator as an industrial apparatus for incinerating waste, and a rotatable cylindrical furnace body is used as a cylindrical body. shall include The rotary incinerator is also called rotary stoker type incinerator.

FIG. 1 is a schematic cross-sectional view showing the configuration of a rotary incinerator 100 according to one embodiment. The incinerator 100 includes a rotating structure 10, a waste input unit 20, a wind box 30, a secondary combustion chamber 40, and a post-combustion device 50 according to this embodiment.

The rotating structure 10 includes a cylindrical body 11, a rotary joint 12, a turning roller 13, a driving device 14, and a thrust roller (not shown). The rotating structure 10 is arranged within a cover casing 16 .

The cylindrical body 11 is a furnace body configured by arranging a plurality of water pipes 11a (see FIG. 2) extending along the axial direction at regular intervals in the circumferential direction as pipes for circulating fluid. Incidentally, in the rotary incinerator 100, the cylindrical body 11 is sometimes called a stoker furnace. Adjacent water pipes 11a are connected to each other through fins (not shown) having a plurality of air holes formed at predetermined intervals along the axial direction of the cylindrical body 11 . In addition, the cylindrical body 11 has an inlet-side header pipe 11b which is annularly arranged to match the inlet-side opening to which the waste material W is supplied, and an annularly-arranged shape to match the outlet-side opening through which the incineration ash or the like is discharged. and outlet side header pipe 11c. One ends of the plurality of water pipes 11a communicate with the inlet-side header pipe 11b. The other ends of the plurality of water pipes 11a communicate with the outlet side header pipe 11c. The cooling water flowing from the outlet side header pipe 11c side to the inlet side header pipe 11b side through one of the water pipes 11a can return from the inlet side header pipe 11b side to the outlet side header pipe 11c side through the other water pipes 11a. can. The outlet side header pipe 11 c is connected via a double connecting pipe 17 to a rotary joint 12 installed outside the secondary combustion chamber 40 . In the double communication pipe 17, a supply channel for supplying cooling water to the water pipe 11a and a recovery channel for collecting cooling water from the water pipe 11a are coaxially stacked.

The rotary joint 12 is a bearing mechanism that rotatably supports the double connecting pipe 17 . The rotary joint 12 circulates cooling water for cooling the furnace body in each water pipe 11a through the double connecting pipe 17. As shown in FIG. The arrangement and support structure of the rotary joint 12 in this embodiment will be described in detail below.

The cylindrical body 11 also includes a plurality of annular members 19 coaxially attached to the outer peripheral wall. For example, the cylindrical body 11 may be provided with annular members 19 at two locations, one in the vicinity of the entrance side opening to which the waste material W is supplied and the other in the vicinity of the exit side opening from which the incineration ash or the like is discharged. In addition, in the rotary incinerator 100, the annular member 19 may be called a tire.

The turning roller 13 rotatably supports the annular member 19 . In this embodiment, since there are two annular members 19 , the turning roller 13 is present every two annular members 19 .

The driving device 14 rotates the cylindrical body 11 by rotating the turning roller 13 on the inlet side to which the waste material W of the cylindrical body 11 is supplied. The driving device 14 is not limited to such a configuration. For example, an annular pin gear is coaxially attached to the outer peripheral wall of the cylindrical body 11, and the rotating gear engaged with the pin via is rotated to rotate the cylindrical body 11. It may be rotated.

Also, the turning roller 13 is supported on the first mount 60 . Here, the turning rollers 13 support the cylindrical body 11 so that the cylindrical body 11 assumes an inclined posture in which the inlet side to which the waste material W is supplied is higher and the outlet side to which incinerated ash and the like are discharged is lower. That is, the turning roller 13 is installed on the first mount 60 so that the cylindrical body 11 can rotate in a posture in which the central axis AX is inclined at an angle θ with respect to the horizontal plane (see FIG. 2). In this embodiment, as an example, the surface of the first mount 60 is assumed to be inclined according to the inclined attitude of the cylindrical body 11 .

For example, the thrust roller contacts the annular member 19 in the vicinity of the opening of the cylindrical body 11 on the inlet side to which the waste material W is supplied, thereby moving the cylindrical body 11 in the axial direction along with the inclination of the cylindrical body 11. to regulate. Like the turning roller 13, the thrust roller is also supported on the first frame 60. As shown in FIG.

The waste input section 20 includes an input hopper 21 and a dust feeder 22 . The input hopper 21 receives the waste W, which is an object to be treated, and guides the input waste W to the dust feeder 22 . The dust feeder 22 supplies the waste W sent from the input hopper 21 to the inside of the cylindrical body 11 .

The wind box 30 is installed below the cylindrical body 11 and supplies combustion air 31 toward the cylindrical body 11 . Combustion air 31 supplied from an air box 30 is introduced into the furnace through a plurality of air holes formed in the cylindrical body 11 . The wind box 30 has a divided flow path 30a that is divided into three along the axial direction of the cylindrical body 11 . Each of the three divided flow paths 30a includes a damper 32. As shown in FIG. The damper 32 adjusts the supply amount of the combustion air 31 . Although not shown, each of the three divided flow paths 30a may be further divided into a plurality of sections in the circumferential direction, and the dampers 32 may be provided in each divided section. These divisions may adjust the amount of air supplied according to the amount of waste W stagnating at the bottom of the cylindrical body 11 in the circumferential direction.

The secondary combustion chamber 40 is installed on the upper downstream side of the cylindrical body 11 and processes unburned gas. The post-combustion device 50 is installed at the lower downstream side of the cylindrical body 11 and treats unburned components in the ash.

With such a configuration, the incinerator 100 sequentially transfers the waste W supplied to the cylindrical body 11 to the downstream side while agitating it with the rotation of the cylindrical body 11, and the combustion air 31 supplied from the wind box 30. It can be incinerated through the processes of drying, thermal decomposition, and combustion.

Next, the structure for supporting the rotating structure 10 will be specifically described.

FIG. 2 is a side view showing the support structure of the rotating structure 10. As shown in FIG. 2, illustration of the driving device 14 and the like is omitted.

The cylindrical body 11 and the rotary joint 12 are connected via the double connecting pipe 17 as described above. The double connecting pipe 17 extends from the rotary joint 12 installed outside the secondary combustion chamber 40 through the through hole 40b provided in the wall portion 40a of the secondary combustion chamber 40 and into the cylindrical body 11. extending towards.

The double connecting pipe 17 extends coaxially with the central axis AX of the cylindrical body 11 . That is, the attitude of the double connecting pipe 17 and the rotary joint 12 that rotates the double connecting pipe 17 about the central axis AX is the same as the attitude of the cylindrical body 11, and the central axis AX is at an angle with respect to the horizontal plane. It is tilted at θ. The double communication pipe 17 communicates with an annular outlet-side header pipe 11c installed in the cylindrical body 11 via a plurality of branch pipes 11d radially branched from the central axis AX. In the present embodiment, as an example, there are a total of four tributary pipes 11d branched radially from the central axis AX. Hereinafter, as shown in FIG. 2, the extending direction of the central axis AX is defined as the X direction. In addition, the direction perpendicular to the X direction on the horizontal plane is defined as the Y direction. Also, the direction perpendicular to the XY plane is defined as the Z direction.

The cylindrical body 11 is supported on a ground-side first mount 60 . On the other hand, the rotary joint 12 is supported on a ground-side second base 61 outside the secondary combustion chamber 40 . In this embodiment, as an example, it is assumed that the first mount 60 and the second mount 61 are erected on the ground independently of each other. Further, in this embodiment, the rotary joint 12 is supported by the second mount 61 via the displacement mechanism 70 .

The displacement mechanism 70 includes a first member 71 and a second member 72 that are connected to each other. The first member 71 and the second member 72 are each plate bodies, for example. The second member 72 is movable in a direction perpendicular to the connecting direction with the first member 71 . In this case, the first member 71 is connected to the second mount 61 . The second member 72 is connected to the rotary joint 12 . According to this configuration, the rotary joint 12 is movable with respect to the second mount 61 within a plane parallel to the XY plane. As the displacement mechanism 70, for example, a seismic isolation mechanism using a slide bearing, a seismic isolation mechanism using a rolling bearing, or the like can be applied.

The rotary structure 10 also includes a shear pin 75 having one end connected to the first member 71 side and the other end connected to the second member 72 side. The shear pin 75 is a member that maintains its shape until a predetermined withstand load is applied and breaks when a load exceeding the withstand load is applied. In this embodiment, the load bearing capacity of the shear pin 75 may be determined from the degree of shaking during an earthquake that is assumed to damage the elements forming the rotating structure 10 . Here, the component of the rotating structure 10 assumed to be damaged is, for example, the double connecting pipe 17 . In addition, the installation position, installation number, etc. of the shear pin 75 are not specifically limited.

Next, the operation of the rotating structure 10 according to the present embodiment, especially when an earthquake occurs, will be described.

FIG. 3 is a diagram illustrating an example of the state of the rotating structure 10 after the occurrence of an earthquake with respect to the state of the rotating structure 10 before the occurrence of the earthquake shown in FIG.

First, the shear pin 75 does not break during normal operation without an earthquake, or when an earthquake occurs that does not cause shaking that exceeds the withstand load of the shear pin 75 . Therefore, the rotary joint 12 is supported while being fixed to the second mount 61 .

On the other hand, as shown in FIG. 3, in the event of a large earthquake causing shaking that exceeds the withstand load of the shear pin 75, the shear pin 75 breaks. Then, due to an earthquake, both the first frame 60 that supports the cylindrical body 11 and the second frame 61 that supports the rotary joint 12 shake greatly. At this time, for example, the first mount 60 and the second mount 61 have different vibration periods and amplitudes. However, in the present embodiment, the rotary joint 12 becomes freely movable with respect to the second mount 61 by breaking the shear pin 75 . Therefore, although the rotary joint 12 is on the second mount 61 , it will sway following the sway of the cylindrical body 11 connected via the double connecting pipe 17 . In other words, forced displacement due to the difference in the vibration period between the first base 60 and the second base 61 is less likely to be input to the double connecting pipe 17, so damage is less likely to occur.

Next, the effects of the rotating structure 10 and the incinerator 100 according to this embodiment will be described.

First, the rotating structure 10 according to the present embodiment includes a rotatable cylindrical body 11 in which a pipe for circulating a fluid is arranged, a supply channel for supplying the fluid to the pipe, and a recovery channel for recovering the fluid from the pipe. and a double connecting pipe 17 coaxially laminated. Here, the piping for circulating the fluid corresponds to the water pipe 11a for circulating the cooling water referred to in the above example. The rotating structure 10 is connected to the side of the double connecting pipe 17 opposite to the side connected to the piping, and the rotary joint 12 rotatably supports the double connecting pipe 17 as the cylindrical body 11 rotates. Prepare. Further, the rotating structure 10 includes a displacement mechanism 70 including a first member 71 and a second member 72 movable in a direction perpendicular to the direction of connection with the first member 71 . The first member 71 is connected to the second base 61 on the ground side, and the second member 72 is connected to the rotary joint 12 .

Here, conventionally, the rotary joint 12 is firmly fixed to the second mount 61 . Therefore, when a large earthquake occurs, the first frame 60 and the second frame 61 that support the cylindrical body 11 shake with mutually different vibration periods and amplitudes, and a large amount of vibration occurs between the first frame 60 and the second frame 61 . A relative displacement occurs. Then, relative displacement may be input to the double connecting pipe 17 as forced displacement, causing damage.

On the other hand, according to the rotating structure 10, since the rotary joint 12 is movable with respect to the second frame 61, it can be connected via the double connecting pipe 17 in the event of a large earthquake. It sways following the sway of the cylindrical body 11. Therefore, forced displacement caused by the difference in vibration cycle between the first mount 60 and the second mount 61 is less likely to be input to the double connecting pipe 17, and damage is less likely to occur. In particular, according to the displacement mechanism 70, the rotary joint 12 can move not only along a specific direction such as the X direction, but also along the Y direction. It can be more advantageous to make damage less likely.

Thus, according to this embodiment, it is possible to provide the rotating structure 10 that is advantageous in suppressing the occurrence of damage caused by an earthquake.

Moreover, in the rotating structure 10 according to the present embodiment, the displacement mechanism 70 may be a seismic isolation mechanism using a slide bearing. Alternatively, the displacement mechanism 70 may be a seismic isolation mechanism using rolling bearings.

According to such a rotating structure 10, the displacement mechanism 70 can be adjusted, for example, to the degree of seismic isolation required in consideration of the strength of the double connecting pipe 17, the structure of the second mount 61, or the ease of manufacture. can be selected as appropriate based on the cost and the like.

Further, the rotating structure 10 according to this embodiment may include a shear pin 75 having one end connected to the first member 71 side and the other end connected to the second member 72 side.

According to such a rotating structure 10, if the shear pin 75 having a desired load capacity is selected in advance, the shear pin 75 can be broken in the event of a large earthquake that causes shaking that exceeds the load capacity. , the rotary joint 12 can be suitably movable. On the other hand, during normal operation without an earthquake, or when an earthquake occurs that does not cause shaking that exceeds the withstand load, the shear pin 75 does not break, and the rotary joint 12 does not move to the second frame 61. supported in a fixed state. Therefore, for example, it is possible to prevent problems such as loss of concentricity of the double connecting pipe 17 due to movement of the rotary joint 12 .

Furthermore, the rotary incinerator 100 having the rotatable cylindrical body 11 as the furnace body according to the present embodiment may include the rotating structure 10 that includes the cylindrical body 11 and rotates the cylindrical body 11. .

According to this embodiment, since the above-described rotating structure 10 is provided, the incinerator 100 is provided that is advantageous in suppressing the occurrence of damage due to an earthquake, similar to the effects of the above-described rotating structure 10. can do.

In the above description, the rotary structure 10 is provided in a rotary incinerator 100 as an industrial apparatus for incinerating waste W, and includes a rotatable cylindrical furnace body as the cylindrical body 11. I assumed. However, the rotating structure of the present disclosure is not limited to being applied to the incinerator 100, and can also be employed in other industrial devices with rotatable cylinders, such as rotary kilns.

Further, in the above description, it is assumed that the first mount 60 and the second mount 61 are erected on the ground independently of each other. However, the rotating structure 10 of the present disclosure is not limited to this. In particular, the rotating structure 10 used in the incinerator 100 is large, and in this case, the pedestal itself is also large. Insufficient internal rigidity may cause relative displacement. Therefore, even if the first cradle 60 and the second cradle 61 are integrated, the rotating structure 10 of the present disclosure can be useful.

Furthermore, in the above description, when a large earthquake occurs, the relative displacement between the cylindrical body 11 on the side of the first frame 60 and the rotary joint 12 on the side of the second frame 61 is prevented from being input to the double connecting pipe 17. Therefore, the displacement mechanism 70 is used. On the other hand, it is conceivable that the rotating structure 10 uses, for example, instead of the displacement mechanism 70, an attenuation device that directly connects the first pedestal 60 and the second pedestal 61. FIG.

FIG. 4 is a diagram showing the configuration of the rotary structure 10 provided with a damping device 80 instead of the displacement mechanism 70. As shown in FIG. The damping device 80 is a device capable of exerting a damping force by relative displacement generated between the attached parts. The damping device 80 may be, for example, a buckling restraint brace, a hydraulic damper, or the like. For example, by connecting one end of the damping device 80 to the first pedestal 60 and the other end to the second pedestal 61, the damping device 80 reduces the overall vibration response of the first pedestal 60 and the second pedestal 61. be able to. In particular, when the damping device 80 is employed in the rotating structure 10, the damping device 80 not only avoids damage to the double connecting pipe 17 due to relative displacement, but also prevents the first mount 60 or the second mount 60 from It is also possible to reduce the stress of the steel frame parts themselves, such as columns and beams that constitute the frame 61 .

Although preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist thereof.

10 rotating structure 11 cylindrical body 11a water pipe 12 rotary joint 17 double connecting pipe 61 second mount 70 displacement mechanism 71 first member 72 second member 75 shear pin 100 incinerator

Claims (5)

a rotatable cylindrical body in which a pipe for circulating a fluid is arranged;
a double connecting pipe in which a supply channel for supplying the fluid to the pipe and a recovery channel for recovering the fluid from the pipe are coaxially stacked;
a rotary joint connected to the side of the double communication pipe opposite to the side connected to the pipe, and rotatably supporting the double communication pipe in accordance with the rotation of the cylindrical body;
a displacement mechanism including a first member and a second member movable in a direction perpendicular to the direction of connection with the first member;
with
The first member is connected to a ground-side pedestal,
The rotating structure, wherein the second member is connected to the rotary joint. The rotating structure according to claim 1, wherein the displacement mechanism is a seismic isolation mechanism using sliding bearings. The rotating structure according to claim 1, wherein the displacement mechanism is a seismic isolation mechanism using rolling bearings. The rotating structure according to any one of claims 1 to 3, comprising a shear pin having one end connected to the first member side and the other end connected to the second member side. A rotary incinerator having a rotatable cylindrical body as a furnace body,
A rotating structure that includes the cylindrical body and rotates the cylindrical body,
An incinerator, wherein the rotating structure is the rotating structure according to any one of claims 1 to 4.

Images