JPH1137681A - Collar seal device of rotary air preheater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent air in an air hood from leaking to an exhaust gas side by bringing one end part of an elastic seal member composed by laminating a plurality of thin elastic plates having a large number of slits in such a manner that the slits are shifted from one another in pressure contact with an outer circumference of a rotative cylinder and fixing another end part to a fixed air duct. SOLUTION: An upper end of an elastic seal member 44 comprising a plurality of laminated elastic thin plates 44a, 44b is fixed to an outer circumference of a bottom face of fixed ducts 21, 22 through a channel 43 having an L-shaped cross-section by a fitstening means such as bolts and the like. A bent part 46 is formed at a halfway part in a height direction of the elastic seal member 44 and a large number of slits extending from the halfway part to the bottom end part are provided in each of the elastic thin plates 44a, 44b in such a manner as to be shifted from one another. The bottom end part of the elastic seal member 44 is kept in pressure contact with a sliding member 25 adhering on an outer circumference of the rotative cylinder 24. By such a construction, even if the rotative cylinder makes thermal deformation, the bottom end part of the elastic seal member 44 is kept in pressure contact with an outer circumference of the rotative cylinder 24 so that air tightness is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention seals a connection between a rotating air hood and a fixed air duct in a rotary air preheater (for example, a rote-mühle type heat exchanger) so that air in the air hood is exhausted. The present invention relates to a color seal device that prevents leakage to the side.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of a rote-mühle type air preheater.
On the upper side, an air hood 8 is provided in a required angle range centered on the center of the heat exchange element 1 and the air hood 8 is defined by partitioning the air inward and outward by a partition wall 15 and surrounds the upper air hood 8. An upper fixed exhaust gas hood 9 for supplying a high-temperature exhaust gas 20 to the remaining angle range is provided.

A partition wall 1 having a shape corresponding to the upper air hood 8 is provided below the heat exchange element 1.
5 and a lower fixed exhaust gas hood 11 having a shape corresponding to the upper fixed exhaust gas hood 9. In the remaining angular range of the lower air hood 10, it is formed to be annularly continuous with the partition wall 15, and divides the exhaust gas 20 into an inner primary exhaust gas 5 and an outer secondary exhaust gas 6. An exhaust gas partition wall 7 is provided to be led out.

[0004] The lower air hood 10 has a gear 12 '.
By driving the gear 12 ′ with the motor 12, the air hoods 8 and 10 are integrally rotated via a central shaft (not shown).

In the above construction, the primary air 13 is introduced into the inside of the partition wall 15 of the lower air hood 10 and the secondary air 14 is introduced to the outside thereof. After passing through the heat exchange element 1, the exhaust gas 20 introduced from the reactor is separated into a primary exhaust gas 5 guided inside the exhaust gas partition wall 7 of the lower fixed exhaust gas hood 11 and a secondary exhaust gas 6 guided outside. In addition, dampers 18 and 19 are provided on the downstream side of the primary exhaust gas outlet duct 16 and the secondary exhaust gas outlet duct 17, respectively. The heating temperature of the primary air 13 and the secondary air 14 can be adjusted by adjusting the flow rate of the secondary exhaust gas 6.

[0006] A sealing frame 3 is attached to the rotating air hoods 8 and 10 via an expansion joint 2.
A sealing shoe 4 attached to the sealing frame 3
4 (see FIG. 4) rotates with a small gap S between the upper and lower surfaces of the heat exchange element 1, so that the primary exhaust gas 5,
Sealing between the secondary exhaust gas 6, the primary air 13, and the secondary air 14 is performed.

The primary air 13 and the secondary air 14 have a higher pressure for pumping than the primary exhaust gas 5 and the secondary exhaust gas 6, and therefore, in order to conduct air to the rotating air hoods 8 and 10, It is necessary to seal at a connection 23 between the air hoods 8 and 10 and the fixed air ducts 21 and 22 which are fixed on the extension of the air hoods 8 and 10. For this purpose, a rotary cylinder 24 is integrated with each of the air hoods 8 and 10 respectively. 5 between the rotary cylinder 24 and the fixed air ducts 21 and 22.
8 to a color seal device 42 as shown in FIG.

[0008] Also, since there is a connecting portion 23 'in the partition wall 15 for partitioning the primary air 13 and the secondary air 14 and the exhaust gas partition wall 7 for partitioning the primary exhaust gas 5 and the secondary exhaust gas 6, these connections are provided. The part 23 ′ is also provided with a color seal device 42, but the connection part 23 ′
Sealing between the air hoods 8 and 10 and the fixed air ducts 21 and 22 is not required because the sealing is performed between the air hoods 8 and 10 or the secondary air 14 or between the primary exhaust gas 5 and the secondary exhaust gas 6. The connection 23 with the secondary air 14
And the primary exhaust gas 5 and the secondary exhaust gas 6. When the sealing performance is reduced, air leaks from the air side to the exhaust gas side, and the performance of the rotary air preheater is significantly reduced. .

For this reason, in the prior art, the connecting portion 23 has
A color seal device 42 as shown in FIG. 8 is provided.

That is, the sliding members 25 are attached to the outer peripheral surface of the rotary cylinder 24, and the fixed air ducts 21 and 22 (FIG. 8) which further surround the outer circumference of the rotary cylinder 24 at intervals are provided. An annular seal receiver 26 having a U-shaped cross section and an opening facing the center side is provided, and a plurality of color segments 27 are densely connected to each other by a connecting plate 28 so as to surround the entire circumference of the rotary cylinder 24. The segment strips 29, 30 having a configuration of being connected to each other are fitted and arranged at a required interval.

The seal receiver 26 is composed of a fixed plate 31 and a detachable plate 33 which is detachably attached to the fixed plate 31 with fixing bolts 32 at a required interval. Segment band 2 due to removal of
Exchange of 9, 30, etc. can be performed. The collar segments 27 are tightly connected to each other with a minimum gap so as to be able to rotate slightly.

The segment bands 29 and 30 are
Each of the six color segments 27 is formed to be slightly longer than the length surrounding the half circumference of the rotary cylinder 24, and the thin portions 34 (see FIGS. 6 and 7) formed at both ends are overlapped with each other. The rotation cylinder 24 is disposed so as to surround the entire outer periphery thereof by being combined. One end of one segment band 30 is fixed to the seal receiver 26 by a locking pin 35, and the other end of the other segment band 29 on the opposite side to the fixed side end of the segment band 30 is similarly fixed by a locking pin ( (Not shown) and is fixed to the seal receiver 26. In the case shown, two segment bands 2
The case where the outer circumference of the rotary cylinder 24 is surrounded by 9 and 30 is shown.
30 may be one having a length covering the entire circumference of the rotary cylinder 24, or may be divided into three or more.

Locking pins 3 for the segment bands 29, 30
Each of the ends opposite to the fixed end fixed by 5 is tensioned on each of the segment bands 29, 30
Is connected to an outer peripheral surface of the rotary cylinder 24, and the adjusting rod 36 is passed through a spring seat 37 provided on the seal receiver 26 to fix the exhaust gas hoods 9, 11
(FIG. 5), and a spring seat 37 of the adjusting rod 36 is provided.
And an adjusting screw 39 for pressing the tightening spring 38 into contact with the end of the adjusting rod 36, and extending into the fixed exhaust gas hood 9, 11 of the adjusting rod 36. A protection cylinder 40 that hermetically surrounds the outer end is fixed to the seal receiver 26 to form a tension adjusting device 41.

The segment bands 29 and 30 are
In consideration of the wear of the collar segment 27 due to the contact with the collar 4, the shape is provided in advance with a wear allowance.

When the rotary air preheater is started, by adjusting the adjusting screw 39 of the tension adjusting device 41, the segment bands 29, 30 are brought into contact with the outer peripheral surface (sliding member 25) of the rotary cylinder 24 with a required pressing force. The spring force of the tightening spring 38 is adjusted in advance so as to make contact. Then, the segment bands 29 and 30
Makes contact with the outer peripheral surface of the rotary cylinder 24 with a required pressure contact force set by the tightening spring 38, and the rotary cylinder 24 and the fixed air duct 2
It is possible to keep the gap between 1 and 22 to a minimum.

[0016]

In the above-mentioned conventional color seal device for a rotary air preheater, as shown in FIG. 8, the segment bands 29 and 30 come into contact with the outer peripheral surface of the rotary cylinder 24 with a required pressing force. The color segments 27 constituting the segment bands 29 and 30 are provided with a wear allowance in advance in consideration of wear.
7 needs to be replaced.

When the color segment 27 is replaced, the replacement work is performed by removing the detachable plate 33. However, the rotary air preheater itself is a very large device,
Since the third and color segments 27 are also large and heavy, there is a problem that the replacement operation takes a long time, and further, there is a problem that the price of the color segment 27 becomes expensive.

An object of the present invention is to provide a color seal device for a rotary air preheater which solves such problems, is lightweight, requires only a short replacement time, and is inexpensive.

[0019]

SUMMARY OF THE INVENTION The present invention relates to a heat exchange element having a disc shape and a heat exchange element for dividing and conducting air in the same required angle range around the center of the heat exchange element. An upper air hood and a lower air hood are provided with the upper and lower fixed exhaust gas hoods sandwiching the heat exchange element so as to surround the air hoods and conduct high-temperature exhaust gas to the remaining angle range. A rotary cylinder formed in the upper and lower air hoods of a rotary air preheater provided with a lower fixed exhaust gas hood and configured to rotate the upper and lower air hoods, and disposed on an axis of the rotary cylinder; In addition, in the color seal device provided at the connection portion with the lower fixed air duct, the slits are displaced from each other by an elastic thin plate having a bent portion formed at an intermediate portion and having a number of slits extending from the intermediate portion to one end. A color sealing device for a rotary air preheater, characterized in that one end of a plurality of stacked elastic seal members is pressed against the outer periphery of a rotary cylinder and the other end is fixed to the fixed air duct. It is only necessary to use an elastic seal material in which a plurality of elastic thin plates are stacked.
Since the slits of the plurality of stacked elastic thin plates are shifted from each other, air does not leak from the slit to the exhaust gas side.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an enlarged longitudinal sectional view showing an example of an embodiment in which the present invention is applied to a portion I in FIG. 3, and the lower surface of the fixed air ducts 21 and 22 in FIG.
A channel 43 having a shape is fixed by means such as welding or bolt fixing. The channel 43 is provided with an elastic sealing material 44 composed of a plurality of (two in the illustrated embodiment) stacked elastic thin plates 44a and 44b. The upper end is fixed by fastening means 45 such as bolts and nuts.

The elastic sealing member 44 formed by stacking a plurality of elastic thin plates 44a and 44b is formed in a cylindrical shape, and has an intermediate portion in the height direction having a cross section extending along the entire circumference of the cylindrical shape. A bent portion 46 is formed.

A plurality of elastic thin plates 44a, 44
As shown in FIG. 2, a plurality of slits 47 extending from the intermediate portion to the lower end are provided at predetermined intervals in each of the elastic thin plates 4a and 44b. The slits 47 are shifted from each other.

The lower end of the elastic sealing member 44 is pressed against the sliding member 25 attached to the outer peripheral surface of the rotary cylinder 24 by the elasticity exerted by the bent portion 46 and the followability by the slit 47. Is kept.

Next, the operation of the above embodiment will be described.

When the rotary air preheater is operated, the fixed air ducts 21 and 22 and the rotary cylinder 24 are thermally deformed by the action of the high-temperature exhaust gas 20 (see FIG. 3). Due to the elasticity of the bent portion 46 and the followability of the slit 47, the fixed air ducts 21 and
2. Despite the thermal deformation of the rotary cylinder 24, the elastic sealing material 44
Is constantly in pressure contact with the sliding member 25 on the outer peripheral surface of the rotary cylinder 24. Since the slits 47 provided in the elastic thin plates 44a and 44b are displaced from each other, the airtightness is not hindered by the slits 47, and the elastic sealing member 44 prevents air from leaking to the exhaust gas side. Will be held.

When replacing the elastic seal material 44 due to wear or the like, the elastic seal material 44 can be replaced by removing the fastening means 45, and the elastic thin plates 44a, 4a can be replaced.
Since the elastic sealing member 44 having a configuration in which a plurality of the members 4b are stacked is lightweight, the replacement operation can be easily performed in a short time. Further, the elastic seal member 44 can be manufactured at a low cost with a simple configuration.

In the illustrated embodiment, the elastic sealing member 44 in which the two elastic thin plates 44a and 44b are overlapped is exemplified, but not limited to two, but three or more elastic thin plates may be overlapped.

[0029]

According to the present invention, the lower end of the elastic sealing material always remains on the outer peripheral surface of the rotating cylinder even when the fixed air duct and the rotating cylinder are thermally deformed due to the elasticity of the elastic sealing material by the bent portion and the followability by the slit. Since the airtightness can be maintained by pressing, and the slits of each elastic thin plate are shifted from each other,
It has the effect of not impairing airtightness.

Further, since the elastic sealing material in which a plurality of elastic thin plates are stacked is light in weight, the replacement operation can be easily performed in a short time, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional view showing an example of an embodiment in which the present invention is applied to a portion I in FIG.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 is a vertical sectional side view showing an example of a conventional rotary air preheater.

FIG. 4 is an exploded perspective view showing an upper half of the apparatus of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a partial detailed view of FIG. 5;

FIG. 7 is a view taken along the line VII-VII in FIG. 6;

8 is a diagram corresponding to an enlarged view of a portion VIII in FIG. 3,
FIG. 7 is a sectional view taken along line VIII-VIII of FIG. 6.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange element 8 Upper air hood 9 Upper fixed exhaust gas hood 10 Lower air hood 11 Lower fixed exhaust gas hood 21 Upper fixed air duct 22 Lower fixed air duct 23 Connection part 24 Rotating cylinder 42 Color seal Device 44 Elastic sealing material 44a Elastic thin plate 44b Elastic thin plate 46 Bending part 47 Slit

Claims (1)

[Claims] 1. A disk-shaped heat exchange element and a same angle range around the center of the heat exchange element,
An upper air hood and a lower air hood are provided with a heat exchange element interposed therebetween so as to separate and conduct air, and the high-temperature exhaust gas is passed around the both air hoods and the remaining angular range. Rotation formed on the upper and lower air hoods of a rotary air preheater that is provided with an upper fixed exhaust gas hood and a lower fixed exhaust gas hood with a heat exchange element interposed therebetween, and rotates the upper and lower air hoods. A tube,
A collar sealing device provided on the axis of the rotary cylinder and provided at a connection portion with an upper fixed air duct, wherein a bent portion is formed in an intermediate portion, and a plurality of slits extending from the intermediate portion to one end are provided. A rotary air preheater, characterized in that one end of an elastic seal material in which a plurality of thin plates are overlapped with slits shifted from each other is pressed against the outer periphery of the rotating cylinder and the other end is fixed to the fixed air duct. Color seal device.