JPH0735333A - Collar seal device for rotary air preheater - Google Patents

Abstract

PURPOSE:To keep a gap between a segment belt and a rotary cylinder at a minimum proper value and prevent leakage of air toward a discharged gas side by a method wherein in the case that a sealing characteristic is deteriorated and the air leakage toward the discharged gas side occurred, a fastening force of a fastening spring of a tension adjusting device is adjusted at an outside part of a fixed discharged gas hood. CONSTITUTION:In the case that a rotary air preheater is started to operate, a closing lid 48 of a tension adjusting device 49 is removed, an adjusting screw 47 is adjusted to adjust a repelling force of a fastening spring 46, thereby segment belts 29 and 30 are contacted with an outer circumferential surface of a rotary cylinder 24 with a desired press contacting force. Due to operation, there occurs a gap between the rotary cylinder 24 and each of the segment belts 29, 30, an air leakage occurs from air hoods 8 and 10 toward the discharged gas, resulting in that the air leakage is detected by a leakage sensing device. The adjusting screw 47 of the tension adjusting device 49 is rotated until the air leakage detected shows a value less than a predetermined value and then the fastening force of the fastening screw 46 is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention seals a connecting portion between a rotating air hood and a fixed air duct in a rotary air preheater (for example, a Rotemure heat exchanger) so that air in the air hood is exhaust gas. The present invention relates to a color seal device configured to prevent leakage to the side.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of a rotoremure type air preheater, which is a disc-shaped heat exchange element 1.
The upper side of the air hood 8 surrounds the air hood 8 which divides air into the inside and the outside by the partition wall 15 and guides the air hood 8 in the required angle range centered on the center of the heat exchange element 1. The upper fixed exhaust gas hood 9 for supplying the high temperature exhaust gas 20 is provided in the remaining angle range. The lower air hood 1 has a partition wall 15 having a shape corresponding to the upper air hood 8 on the lower side of the heat exchange element 1.
0, and a lower fixed exhaust gas hood 11 having a shape corresponding to the upper fixed exhaust gas hood 9 is provided. In the remaining angular range of the lower air hood 10, the exhaust gas 20 is formed in an annular continuous manner with the partition wall 15, and the exhaust gas 20 is partitioned into an inner primary exhaust gas 5 and an outer secondary exhaust gas 6. The exhaust gas partition wall 7 is provided so as to be led out.

As shown, the lower air hood 1
0 is provided with a gear 12 ′, and the gear 12 ′ is driven by a motor 12 so that the air hoods 8 and 1
I am trying to rotate 0 as one.

In the above structure, the primary air 13 is introduced inside the partition wall 15 of the lower air hood 10 and the secondary air 14 is introduced outside the partition wall 15, and the upper fixed exhaust gas hood 9 is introduced. After passing through the heat exchange element 1, the exhaust gas 20 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. It is of the twin flow type, and is also the primary exhaust gas outlet duct 1
6 and the secondary exhaust gas outlet duct 17 are provided with dampers 18 and 19 respectively on the downstream side to adjust the flow rates of the primary exhaust gas 5 on the inside and the secondary exhaust gas 6 on the outside to control the primary air 13 and the secondary air 14. The heating temperature can be adjusted.

A sealing frame 3 is attached to the rotating air hoods 8 and 10 through an expansion joint 2, and a sealing shoe 4 attached to the sealing frame 3 has a small gap between the upper and lower surfaces of the heat exchange element 1. Exhaust gas 5, 6 and air 1 by rotating with S
A seal between the parts 3 and 14 is made.

The air 13, 14 has a higher pressure than the exhaust gases 5, 6 for pumping, and therefore the air hood 8, 10 is an extension of the air hood 8, 10 in order to pass air through it. Fixed air duct 21 fixed on the line,
It is necessary to perform sealing at the connecting portion 23 with 22. For this reason, the rotary cylinders 24 are integrally formed in the air hoods 8 and 10, respectively, and between the rotary cylinder 24 and the fixed air ducts 21 and 22. In addition, a color seal device 42 as shown in FIGS. 5 to 8 is provided. Further, since 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 also have connection portions 23 ', these connection portions 23' Although the color seal device 42 is also provided, since the connecting portion 23 ′ is a seal between the primary air 13 and the secondary air 14 or between the primary exhaust gas 5 and the secondary exhaust gas 6, Although the strict sealing property is not required, the connection part 23 between the air hoods 8 and 10 and the fixed air ducts 21 and 22 is an important part for partitioning the secondary air 14 and the primary exhaust gas 5, and the sealing property is deteriorated. Then, 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, conventionally, the connecting portion 23 has a structure shown in FIG.
A color seal device 42 as shown in FIG. 8 is provided.

That is, the fixed air ducts 21 and 22 fixedly attached to the outer peripheral surface of the rotary cylinder 24 so as to surround the rotary cylinder 24 with a gap.
Is provided with an annular seal receiver 26 having a U-shaped cross section and an opening facing the center side.
Multiple color segments 27 to surround the entire circumference of 4
The segment bands 29 and 30 having a configuration in which they are closely connected to each other by a connecting plate 28 are fitted and arranged with a required interval. The seal receiver 26 includes a fixed plate 31 and the fixed plate 31.
And a detachable plate 33 which is detachably attached with a fixing bolt 32 at a required interval with respect to the segment bands 29, 30 by detaching the detachable plate 33.
It is possible to exchange the items. The color segments 27 are closely connected to each other with a minimum gap so that they can be slightly rotated.

In the illustrated case, the segment bands 29 and 30 are
It is formed to be slightly longer than the length surrounding the half circumference of the rotary cylinder 24, each of which is composed of six color segments 27, and thin portions 34 (see FIG. 8) formed at both ends are overlapped with each other. Are arranged so as to surround the entire outer circumference of the rotary cylinder 24. One end of one segment band 29 is fixed to the seal receiver 26 by the locking pin 35, and similarly, the end of the other segment band 30 opposite to the fixed side end of the segment band 29 is locked by the locking pin ( It is fixed to the seal receiver 26 by (not shown). In the illustrated case, the two segment bands 29, 30
Although the case where the outer circumference of the rotary cylinder 24 is surrounded by is shown, the segment bands 29 and 30 may be one having a length covering the entire circumference of the rotary cylinder 24.
Further, it may be divided into three or more.

Locking pin 3 of the segment bands 29, 30
The end portions on the opposite side of the fixed side end fixed by 5 are respectively pulled by the end portions to obtain the segment bands 29, 30.
Is connected to the outer peripheral surface of the rotary cylinder 24 by connecting the adjusting rod 36, and the adjusting rod 36 is passed through a spring seat 37 provided in the seal receiver 26 to fix the fixed exhaust gas hoods 9, 11
The tightening spring 38 is arranged outside the spring seat 37 of the adjusting rod 36, and an adjusting screw 39 for compressing the tightening spring 38 is screwed onto the end of the adjusting rod 36. A tension adjusting device 41 is configured by fixing a protective cylinder 40, which hermetically surrounds the outer end of the adjusting rod 36 extending into the fixed exhaust gas hoods 9 and 11, to the seal receiver 26.

The segment bands 29, 30 are formed by the rotary cylinder 2
In consideration of the wear of the color segment 27 due to the contact with 4, the shape is provided with a wear allowance in advance.

At the time of starting the rotary air preheater, by adjusting the adjusting screw 39 of the tension adjusting device 41, the segment bands 29 and 30 are applied to the outer peripheral surface (sliding member 25) of the rotary cylinder 24 with a required pressure contact force. The spring force of the tightening spring 38 is adjusted in advance so that they come into contact with each other. Then, the segment bands 29, 30
Comes into 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 the first and second parts to a minimum.

[0013]

In the above-mentioned conventional method, since the tension adjusting device 41 is provided in the fixed exhaust gas hoods 9 and 11, the clearance between the segment bands 29 and 30 and the rotary cylinder 24 is adjusted. Is only performed by the tension adjusting device 41 during cold before starting the rotary air preheater, and since the fixed exhaust gas hoods 9 and 11 become hot after the rotary air preheater operates, Could not be adjusted.

However, when the rotary air preheater operates,
Since the parts of the apparatus are deformed by the action of the high temperature exhaust gas 20, the tension of the segment bands 29, 30 is adjusted by the color seal device 42 in anticipation of this deformation, and therefore the adjustment work relies on experience. It was very difficult.

Further, for example, when the diameter of the rotary cylinder 24 is greatly increased due to thermal expansion with respect to the segment bands 29 and 30, the tightening force of the segment bands 29 and 30 becomes excessive, and the air hood is increased. It is conceivable that the rotational resistance with respect to 8 and 10 will become large. For this reason, the tightening spring 38 is generally made to have a relatively small elastic force.

For this reason, the segment bands 29, 30 which are in contact with the rotary cylinder 24 due to the long-term operation of the rotary air preheater.
Of the collar segment 27, the tightening spring 38 is reduced in strength over time, the elastic repulsion is reduced, and the seal receiver 26 and the segment bands 29 and 30 are fixed due to rust or dust. , The tightening spring 38 does not act and a gap remains between the rotary cylinder 24 and the segment bands 29, 30 and the sealing performance deteriorates. As a result, the air hoods 8, 10 in FIG. The secondary air 14 may leak to the primary exhaust gas 5 side to deteriorate the performance of the rotary air preheater. However, in the conventional color seal device 42, this problem should be dealt with during operation of the rotary air preheater. I couldn't.

Further, when the above-mentioned air leakage problem occurs, conventionally, the operation of the rotary air preheater is stopped to secure the sealing property, and the worker is placed inside the rotary air preheater. However, there is a problem that such a work is very difficult and takes a long time for the work, and even in such a case, the cold air of the rotary air preheater is cold. Since adjustments are sometimes made, it was difficult to make adjustments so that the rotary air preheater would maintain a good seal when it was in operation.

The present invention has been made by paying attention to the above-mentioned conventional problems. The gap between the rotary cylinder and the segment band formed by the color seal device can be easily adjusted to an appropriate value from the outside of the rotary air preheater. (EN) Provided is a color seal device for a rotary air preheater, which can be adjusted so as to prevent air from leaking to the exhaust gas side and not give unnecessary rotation resistance to an air hood. Is intended.

[0019]

DISCLOSURE OF THE INVENTION According to the present invention, a disc-shaped heat exchange element and a heat exchange element for partitioning and conducting air in the same required angle range centered on the center of the heat exchange element. An upper air hood and a lower air hood are provided with the heat exchange element sandwiched between the two air hoods to surround the two air hoods so that the high temperature exhaust gas is conducted to the remaining angular range. A fixed exhaust gas hood on the lower side is provided, and a rotary cylinder formed in the upper and lower air hoods of the rotary air preheater configured to rotate the upper and lower air hoods, and arranged on the axis of the rotary cylinder. Further, in the color seal device provided in the connection portion with the lower fixed air duct, a seal receiver having a U-shaped cross section formed in the fixed air duct so as to surround the rotary cylinder and the entire circumference of the rotary cylinder. Surrounding As described above, a plurality of color segments are densely connected to each other, are fitted and arranged in the seal receiver, and one end is fixed to the seal receiver, and the other end of the segment band is pulled in a direction in which the outer circumference of the rotary cylinder is tightened. An adjustment rod that is operably connected and that extends through the seal receiver and the fixed exhaust gas hood to the outside, and a protective cylinder that is disposed between the seal receiver and the fixed exhaust gas hood so as to surround the adjustment rod, A collar seal device for a rotary air preheater, comprising: a tension adjusting device having a tightening spring disposed outside the fixed exhaust gas hood of the adjusting rod.

[0020]

In the present invention, when the rotary air preheater is started, the tension adjusting device adjusts the spring force of the tightening spring so that the segment band comes into contact with the outer peripheral surface of the rotary cylinder with a required pressure contact force.

When the rotary air preheater is operated and the sealing property between the rotary cylinder and the segment band is deteriorated and air leaks to the exhaust gas side, the tension adjusting device is installed outside the fixed exhaust gas hood. By adjusting the tightening force of the tightening spring, the gap between the segment band and the rotary cylinder is maintained at an appropriate minimum value, and air leakage to the exhaust gas side is prevented.

[0022]

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

FIGS. 1 and 2 show an embodiment of the present invention. In the drawings, the same parts as those in FIGS. 3 to 8 are designated by the same reference numerals and detailed description thereof will be omitted. Only the characteristic part will be described.

As shown in FIGS. 1 and 2, the upper and lower fixed air ducts 21 and 22 are enclosed in a seal receiver 26 having a U-shaped cross section so as to surround the rotary cylinder 24 as in FIGS. , Segment segments 29 and 30 having a structure in which a plurality of color segments 27 are closely connected to each other by a connecting plate 28 so as to surround the entire circumference of the rotary cylinder 24 are fitted and arranged,
One end of each of the segment bands 29 and 30 is provided with the seal receiver 2
Fix at 6.

An adjusting rod 43 which is connected to one end of each of the segment bands 29 and 30 and pulled so that the segment bands 29 and 30 are brought into pressure contact with the outer peripheral surface of the rotary cylinder 24.
Is extended to the outside of the fixed exhaust gas hoods 9 and 11 by penetrating the seal receiver 26 and the spring seats 44 provided in the fixed exhaust gas hoods 9 and 11, and protecting the adjusting rod 43 inside the fixed exhaust gas hoods 9 and 11. The cylinder 45 is arranged between the seal receiver 26 and the fixed exhaust gas hoods 9 and 11, and the tightening spring 46 is arranged outside the spring seat 44 of the fixed exhaust gas hoods 9 and 11 in the adjusting rod 43, and the adjusting rod is also provided. Adjustment screw 4 for compressing the tightening spring 46 at the end of 43
7 is screwed to the fixed exhaust gas hoods 9 and 11 and a closing lid 48 is attached to the outside of the fixed exhaust hoods 9 and 11 so as to airtightly surround the outer end portion of the adjusting rod 43.
Make up.

The rotary air preheater has a leak detecting device 50 for detecting the leak of air to the exhaust gas side.
Is provided. The leak detection device 50 includes oxygen concentration meters 51 and 52 that detect the oxygen concentration (O ₂ concentration) in the upper and lower fixed exhaust gas hoods 9 and 11, and a carbon dioxide concentration meter that detects the carbon dioxide concentration (CO ₂ concentration). 53, 54, and an oxygen concentration meter 51, 52 and a carbon dioxide concentration meter 53, 5
4 is provided with an arithmetic unit 55 for detecting the leakage of air from the difference between the detection values on the inlet side and the outlet side.

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

At the time of starting the rotary air preheater, by removing the closing lid 48 of the tension adjusting device 49 and adjusting the adjusting screw 47 to adjust the elastic force of the tightening spring 46, the segment bands 29, 30 are separated. The outer peripheral surface of the rotary cylinder 24 is contacted with a required pressure contact force. When the adjustment is completed, the closure cover 4
8 is attached and the protective cylinder 45 is airtightly closed. By the adjustment, the gap between the rotary cylinder 24 and the segment bands 29, 30 can be kept to a minimum, and the upper and lower air hoods 8, 10 and the fixed air ducts 21, 22 can be sealed. .

By the operation of the rotary air preheater, a gap is created between the rotary cylinder 24 and the segment bands 29 and 30,
When air leaks from the air hoods 8 and 10 to the exhaust gas side, the leak detection device 50 detects the air leak. That is, when air leaks, the oxygen concentration in the exhaust gas increases on the outlet side with respect to the inlet side, and the carbon dioxide concentration decreases on the outlet side with respect to the inlet side.
0 detects air leakage to the exhaust gas side based on the difference in oxygen concentration or carbon dioxide concentration between the inlet side and the outlet side.

When a leak of air above a predetermined level is detected, the closing lid 48 of the tension adjusting device 49 is removed, and the air leak detected by the leak detecting device 50 from the outside of the fixed exhaust gas hoods 9 and 11 reaches a predetermined value. The adjusting screw 47 of the tension adjusting device 49 is turned until the tightening force of the tightening spring 46 is adjusted until At this time, the air in the protective cylinder 45 is released to the outside by removing the closing lid 48, but the air is small between the adjusting rod 43 and the spring seat 44 through which the adjusting rod 43 penetrates. There is no problem because it is a small amount that leaks from the gap.

As described above, since the tension adjusting device 49 is provided outside the fixed exhaust gas hoods 9 and 11, even when the rotary air preheater is in operation, the segment band is fed from the outside of the rotary air preheater. 29, 30 and rotary cylinder 24
Can be easily adjusted so that the clearance between the two is at the minimum appropriate value, thus minimizing the leakage of air to the exhaust gas side and keeping the performance of the rotary air preheater high at all times. You can

Further, during the adjustment, the tightening force by the tightening spring 46 is adjusted so that the tightening force is small and the high sealing property is maintained. It is possible to prevent giving resistance.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0034]

According to the color seal device for the rotary air preheater of the present invention, the gap between the rotary cylinder formed in the upper and lower air hoods and the segment band provided in the fixed air duct is
It can be easily adjusted to an appropriate value from the outside of the rotary air preheater, so that the leakage of air to the exhaust gas side can always be suppressed to a minimum, and yet unnecessary rotation resistance is given to the air hood. It is possible to exert an excellent effect of preventing such a situation.

[Brief description of drawings]

FIG. 1 is a partially cut bottom view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a rotary air preheater to which the present invention is applied.

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

FIG. 4 is an exploded perspective view of the upper half of the device of FIG.

FIG. 5 is a partially cutaway bottom view of a conventional color seal device.

FIG. 6 is a partial detailed view of FIG.

FIG. 7 is a partial vertical cross-sectional view of a conventional color seal device.

FIG. 8 is a view on arrow VIII-VIII in FIG.

[Explanation of symbols]

 1 Heat Exchange Element 8 Upper Air Hood 9 Lower 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 24 Rotating Tube 26 Seal Receiving 27 Color segment 29 Segment band 30 Segment band 35 Locking pin 42 Color seal device 43 Adjusting rod 44 Spring seat 45 Protective cylinder 46 Tightening spring 47 Adjusting screw 49 Tension adjusting device

Claims (1)

[Claims] 1. A disk-shaped heat exchange element, and within the same required angle range centered on the center of the heat exchange element,
An upper air hood and a lower air hood are provided with a heat exchange element sandwiched therebetween so as to partition and conduct air, and both air hoods are surrounded so that hot exhaust gas is conducted in the remaining angular range. Rotation formed on the upper and lower air hoods of the rotary air preheater in which an upper fixed exhaust gas hood and a lower fixed exhaust gas hood are provided with a heat exchange element sandwiched between them, and the upper and lower air hoods are rotated. A cylinder,
What is claimed is: 1. A color seal device, which is disposed on the axis of a rotary cylinder and is provided in a connection portion with a lower fixed air duct, the seal receiver having a U-shaped cross section formed in the fixed air duct so as to surround the rotary cylinder. And a segment band in which a plurality of color segments are tightly connected to each other so as to surround the entire circumference of the rotary cylinder, are fitted and arranged in the seal receiver, and one end is fixed to the seal receiver, and the other end of the segment band An adjusting rod that is connected to the outer periphery of the rotary cylinder in such a manner that it can be pulled in the direction of tightening and that extends through the seal receiver and the fixed exhaust gas hood to the outside; A collar for a rotary air preheater, comprising: a protective cylinder arranged between the two, and a tension adjusting device having a tightening spring arranged outside the fixed exhaust gas hood of the adjusting rod. Lumpur apparatus.