JPH0665769U - Rotary air preheater seal adjuster - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to adjust the gap between the outer side of the sealing frame in the radial direction and the heat exchange element in the middle part to prevent air from leaking to the exhaust gas side, and to provide a rotary air preheater. Increase the heat exchange efficiency. A fixing beam 32 is fixed to an air hood 10 of a rotary air preheater along the sealing frame 3, and one end is rotatably pivoted at an outer end position of the sealing frame 3 and The other end is the fixed beam 3
There is provided an intermediate beam 35 which is pivotally mounted at a required position on the inner side of 2, and which has a connecting member 37 connected to the sealing frame 3 at a required position in the longitudinal direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seal adjusting device for adjusting a seal between an inlet / outlet side air hood and a heat exchange element in a rotary air preheater (for example, a rotemule heat exchanger).

[0002]

[Prior art]

 2 and 3 show an example of a rotemühle heat exchanger. Above the disc-shaped heat exchange element 7, an air compartment is formed in a required angle range centered on the center of the heat exchange element 7. An outlet-side air hood 8 that divides air into the inside and outside by a wall 15 and leads the air out, and an inlet-side fixed exhaust gas hood 9 that surrounds the outlet-side air hood 8 and supplies the high-temperature exhaust gas 20 to the remaining angular range is provided. Set up. Further, on the lower side of the heat exchange element 7, an inlet side air hood 10 having an air partition wall 15 having a shape corresponding to the upper side outlet side air hood 8, and a shape corresponding to the inlet side fixed exhaust gas hood 9. The outlet side fixed exhaust gas hood 11 is provided to rotate either the heat exchange element 7 or the upper and lower air hoods 8 and 10. In the case shown in the figure, the case where the air hoods 8 and 10 are rotated integrally by the motor 12 by the central shaft (not shown) via the gear 12 'is shown.

In addition, the lower inlet air hood 10 is formed in a tubular shape continuously with the air partition wall 15 to partition the exhaust gas into an inner primary exhaust gas 5 and an outer secondary exhaust gas 6. An exhaust gas partition wall 1 is provided so as to lead out.

In the above structure, the primary air 13 is passed through the inside of the air partition wall 15 of the air hoods 10, 8 and the secondary air 14 is passed through the outside of the air hood 10. The exhaust gas 20 introduced from the inlet 9 is divided into a primary exhaust gas 5 guided to the inside of the exhaust gas partition wall 1 of the exhaust gas hood 11 on the lower side after passing through the heat exchange element 7 and a secondary exhaust gas 6 guided to the outside. It is of a twin-flow type configured to lead, and 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, so that the primary exhaust gas 5 on the inside and the secondary exhaust gas on the outside are provided. The heating temperature of the primary air 13 and the secondary air 14 can be adjusted by adjusting the flow rate of No. 6.

A sealing frame 3 is attached to the rotating air hoods 8 and 10 via an expansion joint 2, and a sealing shoe 4 attached to the sealing frame 3 is smaller than upper and lower surfaces of the heat exchange element 7. By moving with a gap S, the exhaust gases 5, 6 and the air 13, 14 are sealed.

The heat exchange element 7 is deformed as shown in FIG. 4 due to the temperature gradient caused by the influence of the high temperature exhaust gas 20. At this time, if the sealing frame 3 and the sealing shoe 4 have a linear shape, a large gap is created between the sealing frame 3 and the sealing shoe 4 and the sealing effect is lowered, or the sealing element 3 contacts the heat exchange element 7. As shown in FIG. 4, the sealing frame 3 is divided into a plurality of parts in the radial direction of the rotary air preheater, and the divided divided frames 3a and 3b are jointed by a joint 21 so as to be bent. is doing.

Further, an outer clearance adjusting device 22 for moving the sealing frame 3 toward and away from the heat exchange element 7 is provided at the outer peripheral side end positions of the air hoods 8 and 10, The gap S between the sealing shoe 4 and the heat exchange element 7 can be adjusted.

FIG. 5 and FIG. 6 show an example thereof, in which an attachment base 23 is fixed to the outer peripheral positions of the air hoods 8 and 10, and one end of the attachment base 23 is connected via a connecting portion 24. And a rod 26 connected to the outer end of the sealing frame 3 and urged toward the heat exchange element 7 by a compression spring 25, and a rod 26 rotatably attached to the mount 23. A cam 28 acting to push down the rod 26 so as to separate it from the heat exchange element 7 via a stopper plate 27 provided at the end (lower end in FIG. 6), and a lever 30 with a roller 29 attached to the cam 28. And a drive unit 31 for adjusting the rotation angle of the cam 28 by pushing and pulling the movable base 31 'from the outside of the rotary air preheater.

When the driving device 31 of the outer gap adjusting device 22 is driven to push and pull the lever 30 to adjust the rotation angle of the cam 28, the rod 26 moves in the axial direction and the heat exchange element 7 and The clearance S between the sealing shoe 4 attached to the sealing frame 3 and the sealing shoe 4 is adjusted. This adjustment can be performed during the operation of the rotary air preheater. Therefore, when the heat exchange element 7 is deformed due to the temperature rise due to the operation of the rotary air preheater, the heat exchange element 7 and the sealing shoe 4 are Adjust so that the gap S between them becomes smaller.

[0010]

[Problems to be solved by the device]

 However, in the above conventional method, the adjustment of the gap S between the heat exchange element 7 and the sealing shoe 4 is performed only at the outer end portion of the sealing frame 3 by the outer gap adjusting device 22, so that the rotary air preheating is performed. The gap S between the heat exchange element 7 and the sealing shoe 4 cannot be adjusted in the longitudinal middle portion of the sealing frame 3 having the required length in the radial direction of the vessel, and therefore, In addition, the sealing performance of the middle part in the radial direction deteriorates, and a large amount of air, which is normally at high pressure, leaks to the exhaust gas side, which significantly reduces the heat exchange efficiency of the rotary air preheater. Had.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to easily adjust the gap between the heat exchange element and the sealing shoe at the outer side and the middle portion of the sealing frame in the radial direction. The purpose is to prevent air from leaking to the exhaust gas side and improve the heat exchange efficiency of the rotary air preheater.

[0012]

[Means for Solving the Problems]

 According to the present invention, a disc-shaped heat exchange element and an inlet-side air hood are sandwiched between the heat exchange element so as to partition and conduct air in the same required angle range centered on the center of the heat exchange element. Side air hood is provided, and the inlet side air hood and outlet side air hood are surrounded, and the inlet side fixed exhaust gas hood and outlet side fixed with a heat exchange element sandwiched so that high temperature exhaust gas is conducted to the remaining angle range. A sealing shoe is attached to the air hood in the rotary heat exchanger in which an exhaust gas hood is provided and either one of the inlet and outlet air hoods provided on both sides of the heat exchange element and the heat exchange element is rotated. Attach the provided sealing frame via expansion joint, and adjust the clearance between the sealing shoe and the heat exchange element at the outer position of the sealing frame. A sealing device for a rotary air preheater having a side gap adjusting device, wherein a fixed beam fixed to the air hood along the sealing frame and one end rotatable to an outer end position of the sealing frame. And the other end is rotatably pivoted to a required position inside the fixed beam, and the required position in the longitudinal direction is connected to the sealing frame via a connecting tool. The present invention relates to a seal adjusting device for a rotary air preheater, which comprises an intermediate beam.

[0013]

[Action]

 According to the present invention, when the outer end of the sealing frame having the sealing shoe is adjusted so as to move toward and away from the heat exchange element by the outer clearance adjusting device, the connecting member attached to the intermediate portion of the intermediate beam is connected to the intermediate portion of the sealing frame. This allows the clearance between the sealing shoe and the heat exchange element to be adjusted simultaneously at the outer peripheral portion and the intermediate portion during operation of the rotary air preheater. In this way, the radially extending sealing frame can be made to follow the deformation of the heat exchange element, so that the gap between the sealing shoe and the heat exchange element is minimized and the air leaks to the exhaust gas side. Can be prevented.

[0014]

【Example】

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

FIG. 1 shows an embodiment of the present invention. In FIG. 1, the same parts as those in FIGS. 2 to 6 are designated by the same reference numerals and detailed description thereof will be omitted. Only explained.

As shown in FIG. 1, a fixed beam 32 is attached to the air hoods 8, 10 so as to extend along the radial direction of the rotary air preheater and along the sealing frame 3 attached to the air hoods 8, 10. Further, one end is rotatably pivoted to the outer end position of the sealing frame 3 via a pin 33, and the other end is pivotable to a required position inside the fixed beam 32 via a pin 34. An intermediate beam 35 pivotally attached to the intermediate beam 35 is provided, and a connecting member 37 is provided at an intermediate portion in the longitudinal direction of the intermediate beam 35 at a predetermined position in the longitudinal direction of the sealing frame 3 via a rod and an adjusting nut 36.

At the outer end position of the sealing frame 3, an outer clearance adjusting device 22 similar to that described above is provided.

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

When the outer end portion of the sealing frame 3 having the sealing shoe 4 is adjusted so as to move closer to and away from the heat exchange element by the outer gap adjusting device 22, the connector 37 causes the middle portion of the sealing frame 3 to move. The clearance S between the sealing shoe 4 of the sealing frame 3 and the heat exchange element 7 is adjusted by pushing and pulling, and at the same time, the clearance S between the outer peripheral portion and the intermediate portion is adjusted during operation of the rotary air preheater. To be done.

Therefore, the radially extending sealing frame 3 of the rotary heat exchanger can be adjusted according to the deformation of the heat exchanging element 7, so that the space between the sealing shoe 4 and the heat exchanging element 7 can be adjusted. The gap S can be minimized to remarkably reduce the leakage of air to the exhaust gas side, and thus the heat exchange efficiency of the rotary air preheater can be significantly increased.

In FIG. 1, when the connecting member 37 is located at the intermediate position in the longitudinal direction of the intermediate beam 35, when the position of the outer end portion of the sealing frame 3 is adjusted, the moving amount is half the moving amount. When the connecting tool 37 moves, and when the connecting tool 37 is installed inside the central portion in the semi-radial direction, the moving amount becomes small, and when it is installed outside in the radial direction, Since the amount of movement becomes large, the gap S can be set small by previously selecting the attachment position of the connector 37 based on the deformation of the heat exchange element 7. Further, by adjusting the adjusting nut 36, the connecting member 37 can adjust the amount of movement of the intermediate beam 35 that pushes and pulls the divided frames 3a and 3b of the sealing frame 3.

It should be noted that 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.

[0023]

[Effect of device]

 According to the seal adjusting device of the rotary air preheater of the present invention, one end of the fixed beam fixed to the air hood and the other end of the ceiling frame are rotatably pivoted and the other end is fixed beam. The inner end of the sealing frame is rotatably pivotally mounted at a required inner position, and the longitudinal position is provided with an intermediate beam connected to the ring frame by a connecting tool. When adjusted to move the heat exchange element closer to or farther from the heat exchange element, the mid-beam coupling moves the radial middle portion of the sealing frame, thus creating a gap between the heat exchange element and the sealing shoe. During operation of the preheater, it will be adjusted simultaneously at two points, the outer peripheral part and the intermediate part.

Therefore, the radially extending sealing frame can be adjusted to follow the deformation of the heat exchange element, minimizing the gap between the sealing shoe and the heat exchange element and allowing air to escape to the exhaust gas side. It is possible to achieve the excellent effect of preventing the above and significantly improving the heat exchange efficiency of the rotary air preheater.

[Brief description of drawings]

FIG. 1 is a cutaway front view showing an embodiment of the present invention.

FIG. 2 is a cut side view showing an example of a rotemule heat exchanger.

3 is an exploded perspective view of the lower half of the apparatus of FIG. 2. FIG.

FIG. 4 is a side view showing a deformed state of a heat exchange element and a configuration of a sealing frame.

FIG. 5 is a cut front view showing an example of a conventional seal adjusting device.

FIG. 6 is a front view showing details of the outer gap adjusting device of FIG.

[Explanation of symbols]

 3 Sealing Frame 4 Sealing Shoe 7 Heat Exchange Element 8 Outlet Air Hood 9 Inlet Fixed Exhaust Gas Hood 10 Inlet Air Hood 11 Outlet Fixed Exhaust Gas Hood 22 Outer Gap Adjuster 32 Fixed Beam 35 Intermediate Beam 37 Coupling S S Gap

Claims (1)

[Scope of utility model registration request] 1. A disk-shaped heat exchange element, and within the same required angle range centered on the center of the heat exchange element,
An inlet side air hood and an outlet side air hood are provided with a heat exchange element sandwiched between them so as to partition and conduct air, and the inlet side air hood and the outlet side air hood are surrounded to generate high temperature exhaust gas in the remaining angular range. The inlet side fixed exhaust gas hood and the outlet side fixed exhaust gas hood are provided so as to sandwich the heat exchange element so as to conduct, and one of the inlet and outlet side air hoods and the heat exchange element provided on both sides of the heat exchange element is rotated. A sealing frame having a sealing shoe is attached to the air hood of the rotary heat exchanger configured as described above through an expansion joint, and a gap between the sealing shoe and the heat exchange element is adjusted at an outer position of the sealing frame. A sealing device for a rotary air preheater comprising an outer clearance adjusting device for performing the air gap adjustment along the sealing frame. Fixed beam and fixed to the hood,
One end is rotatably pivoted to an outer end position of the sealing frame, and the other end is rotatably pivoted to a required inner position of the fixed beam, and a lengthwise required position is A seal adjusting device for a rotary air preheater, comprising: an intermediate beam connected to the sealing frame via a connector.