JP5009027B2 - Rotary kiln sealing device - Google Patents

Description

  The present invention relates to a rotary kiln sealing device, and more specifically, a rotary drum that performs heat treatment while rotating an object that constitutes an indirect heating type rotary kiln, and a heating medium that circulates around the outer periphery of the rotary drum. The present invention relates to a rotary kiln sealing device that seals between a heating chamber that transfers heat to the rotating drum and heats it.

  The indirect heating type rotary kiln has a rotating drum that performs heat treatment while rotating an object to be processed, and an outer cylinder provided on the outer periphery of the rotating drum, and is provided between the outer surface of the rotating drum and the inner surface of the outer cylinder. A heating medium is introduced into a heating chamber to be formed, and is caused to flow along the outer periphery of the rotating drum, whereby heat is transferred to the rotating drum and heated. Such indirect heating kilns conventionally include, for example, carbonized furnaces and waste to be treated such as heating combustible solids containing volatile components such as biomass and fixed carbon to obtain carbides containing a large amount of fixed carbon. It is used in various applications such as a gasification melting furnace that is heated in an inert atmosphere and decomposed into pyrolysis gas and pyrolysis residue, or a dryer.

  In such an indirect heating type rotary kiln, it is necessary to seal between the rotating drum that is the rotating part and the heating chamber that is the fixed part to prevent outflow of the heating medium from the heating chamber and inflow of outside air to the heating chamber. is there.

  Conventionally, a seal between a rotating drum and a heating chamber slides with a sealing member provided on a fixed ring that protrudes from the heating chamber in the direction of the rotating drum rotation axis and is arranged around the rotating drum, and is mounted around the rotating drum. A ring-shaped seal plate is provided, the seal plate is fixed with a wire from the outside, and the seal plate is pressed in the radial direction of the rotating drum so as to follow the vibration in the radial direction of the rotating drum. In order to prevent the seal plate from moving in the circumferential direction and the seal plate from being displaced in the rotation axis direction and leaving the seal member, the seal plate is pressed by a leaf spring (Prior Art 1). .

  Further, in Patent Document 1, a roller chain with tension means wound around a rotary drum, an attachment member attached to the roller chain, and one side attached to a heating chamber in a sealed state, and the other side is the rotary drum There is disclosed a seal device having a ring-shaped elastic member seal that is slidably contacted with the outer peripheral surface and whose intermediate portion is fixed to the mounting member.

Japanese Patent Laid-Open No. 9-079756

  However, in the method of the prior art 1, since a uniform force is applied by the wire over the entire circumference of the seal ring, the force with which the seal ring is pressed against the rotary drum is increased due to gravity at the upper part of the rotary drum. At the lower part of the rotating drum, the force with which the seal ring is pressed against the rotating drum is reduced. For this reason, the seal ring is pressed against the rotating drum with more force than necessary at the upper part of the rotating drum, so that the seal ring wears quickly, and at the lower part of the rotating drum, the seal ring may not follow the vibration of the rotating drum and may cause a seal failure. is there. Further, the rotational frictional force in the circumferential direction of the seal plate may exceed the holding force of the leaf spring, and the seal plate may move in the circumferential direction.

  In the sealing device disclosed in Patent Document 1, as in the prior art 1, the roller chain wears quickly at the upper part of the rotating drum, and the roller chain cannot follow the vibration of the rotating drum at the lower part of the rotating drum, resulting in a poor seal. There is a possibility of waking up.

  Accordingly, in the present invention, in view of the problems of the prior art, the seal ring is pressed against the outer surface of the rotating drum with a uniform force over the entire circumference. It is an object of the present invention to provide a rotary kiln sealing device that does not cause a sealing failure in order to reliably follow the vibrations of the rotary kiln.

  In order to solve the above-mentioned problems, in the present invention, a rotating drum that performs heat treatment while rotating a workpiece constituting an indirect heating type rotary kiln, and the rotating drum that surrounds the outer periphery of the rotating drum and allows a heating medium to flow therethrough. In a rotary kiln sealing device that seals between a heating chamber that transfers heat to a heating chamber, a fixing ring that protrudes from the heating chamber in the rotating drum rotating shaft direction and is arranged around the rotating drum, and one side of the fixing ring is the fixing ring. The seal member includes a ring-shaped seal plate that slides on the outer surface of the rotary drum while sliding with the seal member provided, and the seal plate is a combination of a plurality of seal plate divided bodies in the circumferential direction. A biasing plate that biases each of the plurality of divided seal plate members independently in the radial direction of the rotating drum. Provided with a stage, the biasing force of the biasing means for biasing the anti-gravity direction, characterized in that a larger than the biasing force of the biasing means for biasing in the direction of gravity.

  The seal plate is configured by combining a plurality of seal plate divided bodies divided in the circumferential direction, and provided with a biasing means for biasing each of the plurality of seal plate divided bodies independently in the radial direction of the rotating drum. Each seal plate divided body can be independently urged in the radial direction of the rotating drum, and the urging force of the urging means for urging in the antigravity direction is more than the urging force of the urging means for urging in the gravitational direction. By making it large, the force by which the seal plate is pressed against the outer surface of the rotating drum can be made uniform.

  And a ring-shaped ring plate having pins attached at equal intervals, the ring plate being disposed on the side opposite to the seal plate of the seal plate and the sliding surface of the fixed ring, and the ring being attached to the seal plate A long groove into which the pin whose radial direction is the longitudinal direction of the rotary drum can be inserted is provided at a position corresponding to the pin attached to the plate, the pin provided on the ring plate is inserted into the long groove provided on the seal ring, The ring plate is fixed to the fixing ring by a ring plate pressing member, thereby preventing the seal ring from rotating in the circumferential direction.

A ring-shaped ring plate with pins mounted at equal intervals is placed on the opposite side of the seal plate from the sliding surface of the seal plate and the fixing ring, the pin is inserted into the groove provided in the seal plate, and the ring plate is further attached to the ring By fixing to the fixing ring by the plate pressing member, the ring plate can prevent the seal ring from moving in the circumferential direction. In addition, the groove provided in the seal plate is a long groove whose longitudinal direction is the radial direction of the rotating drum, so that the seal plate does not interfere with the radial displacement of the rotating drum and moves in the circumferential direction of the seal ring. The movement to can be prevented.
Furthermore, by disposing the ring plate on the surface of the seal plate opposite to the sliding surface between the seal plate and the fixed ring, the seal plate is prevented from moving in the direction of the rotation axis of the rotary drum and causing a seal failure. be able to.

  Furthermore, it has a lifting means capable of lifting the ring plate, and the ring plate is lifted by the lifting means to prevent the ring plate from being applied to the seal ring.

As a result, the ring plate can be prevented from being loaded on the seal ring, and therefore the force in the gravitational direction is not applied to the seal ring by the ring plate. It can be made uniform.
Furthermore, when the lifting means is a spring, the entire rotating drum is thermally deformed by the heat in the rotating drum, and the height change follows even when the height of the portion where the seal plate of the rotating drum is attached changes. The ring plate can be moved.

Further, an interval setting means for maintaining a constant interval between the seal plate and the ring plate is provided, and the interval is maintained constant.
As a result, it is possible to prevent the seal plate from being sandwiched between the seal member provided in the fixing ring and the ring plate and causing a malfunction of the seal plate to cause a seal failure.

  As described above, according to the present invention, the seal ring is pressed against the outer surface of the rotary drum with a uniform force over the entire circumference of the seal ring. Therefore, it is possible to provide a rotary kiln sealing device that does not cause a sealing failure.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

  FIG. 1 is a schematic front view of an indirect heating rotary kiln provided with the sealing device of the first embodiment. The rotating drum 1 is provided with an outer cylinder 4 on the outer periphery of portions other than both end portions 2 and 3, and a heating chamber 5 is formed between the outer peripheral surface of the rotating drum 1 and the inner peripheral surface of the outer cylinder 4. Further, the inside of the rotating drum 1 is heated by passing a heating medium such as combustion gas through the heating chamber 5 and transferring the heat to the rotating drum 1. On the other hand, the workpiece is supplied into the rotary drum 1 from the supply port 6. When the rotary drum 1 rotates, the object to be processed supplied into the rotary drum 1 from the supply port 6 is transferred from the supply port 6 side to the discharge port 7 side with stirring and heated by indirect heating. .

  In such an indirect heating type rotary kiln, there is a gap between the rotary drum 2 and the outer cylinder 4 forming the heating chamber 5, and leakage of the heating medium flowing through the heating chamber 5 from the gap and the inside of the heating chamber 5. Therefore, it is necessary to prevent the outside air from flowing in, so that the sealing device 10 is provided.

  2 is a side view of the ring plate and a member attached to the ring plate, FIG. 3 is a cross-sectional view as seen from the AA direction in FIG. 2, and FIG. 4 is a cross-sectional view as seen from the CC direction in FIG. 5 is a cross-sectional view seen from the DD direction in FIG. 2, and FIG. 6 is a cross-sectional view seen from the EE direction in FIG. Hereinafter, the sealing device 10 will be described with reference to FIGS.

A ring-shaped fixing ring 11 is disposed outside the outer cylinder 4 forming the heating chamber 5 so as to protrude in the direction of the rotation axis of the rotary drum 2. In such a configuration, there is a slight gap between the outer cylinder 4 and the fixing ring 11 that are the fixing members and the rotating drum 1 that is the rotating member.
A seal member 12 is fixed to the fixing ring 11 on the surface opposite to the outer cylinder 4. Reference numeral 13 denotes a ring-shaped seal plate, one side of which slides on the seal member 12 and is arranged around the rotary drum 2. Further, the seal plate 13 is configured by combining a plurality of seal plate divided bodies divided in the circumferential direction (in the present embodiment, 16 divisions).

  As shown in FIGS. 2 and 3, the seal plate 13 is provided with a spring 15 that is a means for urging the rotary drum 1 in the radial direction. By energizing in the circumferential direction, the seal plate 13 slides following the deflection of the rotating drum 1 in the circumferential direction, and seals between the rotating drum 1 and the outer cylinder 4.

  Furthermore, the springs 15 are provided in all of the plurality of seal plate divided bodies divided in the circumferential direction, and this allows each of the seal plate divided bodies to be given an urging force in the circumferential direction of the rotating drum 1 independently. It is possible. Further, the biasing force of the spring biased in the anti-gravity direction, that is, the spring positioned below the rotating drum is set larger than the biasing force of the spring biased in the gravity direction, that is, the spring positioned above the rotating drum. The pressing force in the circumferential direction of the rotary drum of the seal plate divided body, which is a combination of the urging force and the gravity applied to the seal plate divided bodies, is constant for all the seal plate divided bodies. As a result, all the seal plate divided bodies are pressed against the rotating drum with the same force, so that only a specific seal plate divided body is pressed against the rotating drum with an excessive force to prevent the seal ring from being worn quickly. be able to. Further, since each seal plate divided body slides on the rotating drum independently, the followability to the outer peripheral surface of the rotating drum is improved and the sealing performance of the sealing device is improved as compared with the case where the seal plate is not divided.

Reference numeral 14 denotes a ring-shaped ring plate, and pins 140 are attached at equal intervals. As shown in FIG. 3, the radial direction of the rotary drum provided with the pins 140 on the seal plate 13 is the longitudinal direction. It is inserted into a long groove 130. Further, by fixing the ring plate 14 to the ring plate presser 16 attached to the fixing ring 11 as shown in FIGS. 2 and 5, the ring plate 14 is prevented from moving in the circumferential direction of the rotary drum 1. Yes.
By providing the ring plate 14 in which the rotation of the rotating drum 1 in the circumferential direction is thus provided, the seal plate 13 can be prevented from moving in the circumferential direction of the rotating drum 1. Further, by inserting the pin 140 attached to the ring plate 14 into the long groove 130 whose longitudinal direction is the radial direction of the seal plate, the seal plate 13 moves in the circumferential direction of the rotary drum 1 and the swing of the rotary drum 1 is swung. The ring plate 14 does not prevent the following.

Further, as shown in FIG. 2, the ring plate is provided with a spring hanger 17 capable of lifting the ring plate. The spring hanger 17 lifts the ring plate 16 to prevent the ring plate 14 from being applied to the seal ring 13. Therefore, the ring plate 14 does not apply a force in the direction of gravity to the seal ring 13, so that the seal plate 13 rotates. The weight of the ring plate 14 does not affect the force pressed against the outer surface of the drum 1. Therefore, it is possible to prevent only the seal ring divided body positioned at the upper part from being pressed against the rotating drum with an excessive force, and the wear of the seal ring from being accelerated.
Furthermore, since the inside of the rotating drum is usually used at a high temperature, the entire rotating drum may be thermally deformed due to the heat in the rotating drum, and the height of the portion of the rotating drum attached with the seal plate may change. The ring plate can be moved using the spring hanger 17 following the change in height.

2 and 6, a ring plate jack 18 capable of adjusting the distance between the plate 20 attached to the ring plate 14 with a bolt 19 and the fixing ring 11 is provided, and the plate 20 and the fixing ring 11 are provided. The distance between the seal plate 13 and the ring plate 14 is kept constant by keeping the distance between the seal plate 13 and the ring plate 14 constant.
As a result, the seal plate 13 is sandwiched between the seal member 12 and the ring plate to prevent the seal plate from moving and causing a seal failure.

The upper and lower portions of the ring plate 14 are fixed via a ring plate holding rod 21 as shown in FIGS. The ring plate holding rod 21 is provided with rod end seals 21 a and 21 b at both ends, and is attached to the member 22 and the ring plate 14 fixed to the fixing ring 11, respectively. The rod end seal 21 b attached to the ring plate 14 is positioned in front of the rotating drum 1 in the rotational direction with respect to the rod end seal 21 a attached to the member 22 fixed to the fixing ring 11.
By providing the ring plate pressing rod 21 in this manner, movement in the circumferential direction can be suppressed without hindering movement of the ring plate 14 in the vertical direction.

  Furthermore, a grease supply means (not shown) capable of supplying grease is provided between the outer surface of the rotating drum 1 and the seal plate 13, thereby reducing the frictional force between the outer surface of the rotating drum 1 and the seal plate 13. The life of the seal plate 13 is reduced by reducing the wear.

  Since it is pressed against the outer surface of the rotating drum with a uniform force over the entire circumference of the seal ring, the seal ring reliably follows the swing of the rotating drum without causing early wear of a part of the seal ring, which may cause a seal failure. Not available as a rotary kiln sealing device.

It is a schematic front view of the indirect heating type rotary kiln provided with the sealing device of the first embodiment. It is a side view of the member attached to the ring plate and the ring plate. It is sectional drawing seen from the AA direction in FIG. It is sectional drawing seen from the CC direction in FIG. It is sectional drawing seen from the DD direction in FIG. It is sectional drawing seen from the EE direction in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating drum 4 Outer cylinder 5 Heating chamber 10 Sealing device 11 Fixing ring 12 Sealing member 13 Seal plate 14 Ring plate 15 Spring 16 Ring plate presser 17 Spring hanger 18 Ring plate jack 21 Ring plate presser rod 130 Long groove 140 Pin

Claims (4)

Between a rotating drum that heats while rotating a workpiece that constitutes an indirect heating type rotary kiln, and a heating chamber that surrounds the outer periphery of the rotating drum and allows a heating medium to flow to transfer heat to the rotating drum and heat it. In the rotary kiln sealing device that seals
A fixing ring that protrudes from the heating chamber in the direction of the rotating drum rotation axis and is arranged around the rotating drum;
One side slides with a seal member provided in the fixed ring, and the other side has a ring-shaped seal plate that slides with the outer surface of the rotating drum,
The seal plate is a seal plate formed by combining a plurality of seal plate divided bodies divided in the circumferential direction,
The urging means for urging the urging means for urging in the anti-gravity direction and the urging means for urging the anti-gravity direction in the gravity direction are provided in each of the plurality of seal plate divided bodies independently. A rotary kiln sealing device characterized in that it is larger than the urging force of. It has a ring-shaped ring plate with pins attached at regular intervals,
The ring plate is disposed on the side opposite to the sliding surface of the seal plate and the fixing ring of the seal plate,
The seal plate is provided with a long groove into which the pin whose radial direction is the longitudinal direction can be inserted at a position corresponding to the pin attached to the ring plate,
Insert the pin provided on the ring plate into the long groove provided on the seal ring,
The rotary kiln sealing device according to claim 1, wherein the ring ring is fixed to the fixing ring by a ring plate pressing member to prevent the seal ring from rotating in the circumferential direction. A lifting means capable of lifting the ring plate;
3. The rotary kiln seal device according to claim 2, wherein the ring plate is lifted by the lifting means to prevent the ring plate from being loaded on the seal ring.   4. The rotary kiln sealing device according to claim 2, further comprising an interval setting means for maintaining a constant interval between the seal plate and the ring plate, and maintaining the interval constant.

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