CN1222229A - Rotor post with floating tensile header - Google Patents

Abstract

A rotary regenerative air preheater having a rotor (14) mounted to a central rotor post (16) for rotation within a surrounding housing. Upper and lower rotor post headers (44, 46) provide means for mounting diaphragms (40). The upper rotor post header (60) includes an interior opening (62) for receiving the rotor (14) and an outer peripheral portion (66) having a plurality of circumferentially spaced slots (64). The upper portion (78) of the inboard end (80) of each diaphragm (76) defines a box-shaped lug (82) which is received in one of the slots (64) to prevent radial movement of the diaphragm (76).

Description

The rotor post of band floating tensile header

The background of invention

The present invention relates to the rotary regenerative air preheater, it adopts rotor post so that the rotation of rotor; Particularly, novel rotor post head, it is used to install the rotor dividing plate.

The rotary regenerative air preheater by the rotor regeneration heat transfer surface of continuous rotation through gas and air stream, is put the combustion air that heat passes to input with the waste gas that leaves boiler.Rotor by the heat transfer surface sealing has rotor post; For most of vertical-flow air preheaters, rotor post is by the lower bearing supporting of air preheater lower end and by being positioned at the bearing assembly guiding on top.Some vertical-flow air preheaters adopt top-supported bearing and lower guide bearing.Rotor is called dividing plate by a plurality of plates that radially extend, and is divided into several chambers.Generally, the lower inside edge bearing of dividing plate is on the flange of lower rotor part pillar head, and the upper spacer joint tongue is fixed in the annular groove of upper rotor part pillar head by pin.

In typical rotary regenerative heat exchanger, the waste gas of heat and combustion air enters rotor case from opposite two ends and along the opposite heat exchange material of direction by being equipped with in the rotor.Therefore, inlet of cold air and refrigerating gas outlet are the ends at heat exchanger, be called cold junction, and the air outlet slit of hot gas import and heating are the opposite ends at heat exchanger, are called the hot junction.As a result, the cooling from the hot junction of rotor to rotor exists axial temperature poor.Because tending to be out of shape and present, this temperature difference, rotor be similar to the shape (claiming under the rotor curved usually) of being inverted dish.This distortion make the dividing plate joint tongue on its steady pin to top offset, thereby for the dividing plate joint tongue, pin and the flange that limits the upper rotor part pillar head of annular groove apply tension.Therefore, upper rotor part pillar head has heavy structure so that the annular groove with enough height is provided and allows the dividing plate joint tongue to move, and provides the flange with adequate thickness to be out of shape the tension that is applied with bear rotor.Such structure manufacturing expense is expensive and rotor bearing applied very heavy weight load.

Summary of the invention

The invention provides a kind of Design of device in air preheater, it is used for the rotor dividing plate is fixed on rotor post.Wherein, erecting device can freely move axially on rotor post.Reduce the tension on the erecting device like this, thereby allowed to reduce the quality of erecting device.

Brief Description Of Drawings

Fig. 1 is the overall perspective view of common rotary regenerative air preheater;

Fig. 2 is the cutaway view of partly cut-away.The rotor post of the prior art of its presentation graphs 1 air preheater and rotor dividing plate;

Fig. 3 is the cutaway view of the partly cut-away of amplification, and it represents rotor post of the present invention, upper and lower rotor post head and rotor dividing plate;

Fig. 4 is the top view that amplifies, the rotor post head part of its presentation graphs 3 and the part of a plurality of rotor dividing plates;

Fig. 5 is the view of partly cut-away of the alternative embodiment of Fig. 3 dividing plate and lower rotor part pillar head.

The explanation of preferred embodiment

Fig. 1 is the stereogram of the partly cut-away of typical dual area air preheater 10.It shows shell 12, and wherein, rotor 14 is installed on power transmission shaft or the pillar 16, rotates so that press arrow 18 indicated directions.The zone plate 20,22 of fluid sealing is divided into exhaust gas side 24 and air side 26 with shell.Bottom at this device also is provided with corresponding zone plate.(not shown) in three regional air preheaters, rotor case is divided into three zones and is comprised exhaust zone by zone plate, first order air zone and second level air zone.Hot waste gas enters air preheater 10 by air inlet pipe 28, flows through the zone of the heating surface that transfers heat to rotor 14, thereafter, discharges through blast pipe 30.When this hot heat transfer surface was rotated through air side 26, heat was delivered to the air that flows through rotor from air inlet pipe connector 32.Heated air stream forms thermal current and leaves air preheater 10 through pipe jointing part 34.Therefore, the inlet of cold air and the gas vent 30 that is cooled define the cold junction of heat exchanger, and hot air intake 28 and heated air outlet define the hot junction of heat exchanger.

Rotor 14 is formed by a plurality of regional 36, and there is cabin, many unit 38 in each zone and each zone is limited by dividing plate 40.The medial extremity 42 of dividing plate 40 is bearing on the upper and lower rotor post head 44,46.When air preheater 10 running, along with preheater proceeds to the duty of heat from cold off working state, the cold junction from the hot junction of rotor 14 to rotor 14 produces the axial temperature difference.This axial temperature difference causes rotor 14 distortion.As a result, the top 48 of the medial extremity 42 of dividing plate 40 is axially to top offset.

As shown in Figure 2, joint tongue 50 stretches into the normal air preheater from top 48 warp-wises of the medial extremity 42 of dividing plate 40.Joint tongue 50 is installed in the annular groove of upper rotor part pillar head 44 and by finger setting.When air preheater 10 when cold state begins to proceed to hot state, the distortion of formation make joint tongue 50 on pin 54 to top offset.Such displacement is stoped by the joint tongue 50 and the friction of selling between 54, thereby for dividing plate joint tongue 50, pin 54 and the flange 56,58 on the upper rotor part pillar head 44 that limits annular groove 52 apply tension.Therefore, upper rotor part pillar head must have enough structure divisions to make annular groove have the height of permission dividing plate joint tongue 50 displacements and flange 56,58 is had is enough to bear because the thickness of the tension that rotor deformation caused.

In the present invention, upper rotor part pillar head 60 comprises the floating tensile ring, and it has endoporus 62 so that rotor post 16 (seeing Fig. 3 and 4) is installed.A plurality of circle spacings and the groove 64 that radially extends are arranged in the neighboring part 66 of upper rotor part pillar head.The outside portion 68 of each groove 64 limits gap 72 in the circumferential surface 73 of head 60.The inside portion 70 of each groove 64 limits a pair of shoulder 74, and wherein, this groove is T-shaped.Box-shaped protuberance 82 is arranged at the top 78 of the medial extremity 80 of each dividing plate 76, in the inside portion of the T-slot 64 that it one of is mounted in it.Determine that with the inside portion 70 of groove 64 shoulder 74 engages by the shoulder 84 that protuberance 82 is determined, to prevent moving radially of dividing plate 76.Each dividing plate 76 has the groove 86 that is provided with below protuberance 82.The height H of groove 86 is the same big or small with the thickness T of upper rotor part pillar head 60 at least.By the neighboring part 66 of upper rotor part pillar head 60 is inserted groove 86, the protuberance 82 of dividing plate 76 is positioned at above the inside portion 70 of groove 64, reduces dividing plate 76, thereby protuberance 82 installations are positioned in the inside portion 70 of groove 64, like this, dividing plate 76 is installed to upper rotor part head 60.

Between on-stream period, rotor deformation moves up upper rotor part pillar head 60 on rotor post 16.The radial load that 76 pairs of upper rotor part pillars of each dividing plate head 60 is acted on is installed in the radial load that one or more dividing plates 76 of upper rotor part pillar head 60 opposition sides are acted on and offsets.Therefore, rotor post 16 remains on the position at the cardinal principle center in the endoporus 62.As example, for the rotor of given size and weight, the thickness T of upper rotor part pillar head is 6 inches.This head has the quality of lacking about 50-60% than the similar quality of head 44 traditionally of the rotor of same size and amount.This head has enough mechanical strengths with the tension of bearing dividing plate 76 and being applied and have less than the diameter of head traditionally.

Lower rotor part pillar head 88 preferably is fixed on the rotor by soldered 90.The bottom 92 of the neighboring part 98 of lower supporting rod head 88 radially extends to outside the top 94 of neighboring part 98 to limit shelf 96.Bottom 100 every the medial extremity 80 of plate 76 is bearing on the shelf 96, thereby dividing plate 76 is supported by lower rotor part pillar head 88.(Fig. 5) in one embodiment, a plurality of T-slots 102 are arranged at the top 94 ' of the neighboring part 98 ' of lower supporting rod head 88 '.The bottom 100 ' of the medial extremity 80 ' of each dividing plate 76 ' limits box-shaped protuberance 104 ', and it is contained in the groove 102 so that dividing plate 76 ' is locked onto on the rotor post 16.The lower surface of each protuberance 104 is bearing on the shelf 96 ' of lower supporting rod head 88 '.

Expand by the hole and the relatively hot between the pillar 16 of allowing floating tensile ring 60, the fixedly connected relatively hot that produces of the traditional design between dividing plate 40 and upper supporting column head 44 expands and is eliminated.By controlling the diameter in the pillar 16 and the hole of ring 60, floating tensile ring 60 is the center with pillar 16, thereby allows the thermal expansion between them and need not consider rotor 14 or single regional 36 actual gross weight.

Almost can be fully design lower support head 88 of the present invention, expand surpassing of being produced and be reduced or eliminate greater than the extra axial load of deadweight because go up fixedly connected relatively hot based on the deadweight of rotor 14.As a result, the extra axial load to head portion 88 reduces about 80-90%.Therefore, for the rotor 14 of given size and weight, lower supporting rod head 88 desired quality of the present invention reduce to surpass 50%.In the present invention, the reaction of the motion of toppling that can be produced according to air pressure drop by heat transfer surface and since air to the radial pressure that pressure reduction caused of gas, design rotor post shell.

Claims (15)

1. the rotor arrangement of rotary regenerative air preheater comprises:

Limit the rotor post of vertical rotating shaft line substantially, this rotor post has bottom and top;

The first rotor head, it is fixed to the bottom of rotor post and radially extends from this bottom;

Second rotor head, its limits axial hole so that the top of rotor post to be installed slidably, and the groove that has outer periphery part, this outer periphery partly to limit a plurality of circle spacings and radially extend; With

A plurality of dividing plates that radially extend and limit rotor region, each dividing plate has last inside part and following inside part, the following inside part of each dividing plate and the first rotor engagement, so that the first rotor head is supported this dividing plate, inside part has protuberance on each dividing plate, each protuberance is installed in one of them the groove and has and the groove engaging portion, with moving radially of restriction dividing plate.

2. by the rotor arrangement of claim 1, wherein, each groove comprises inside part and Outboard Sections, and the inside part of each groove limits a pair of shoulder, so that engage with protuberance.

3. by the rotor arrangement of claim 2, wherein, each protuberance limits a pair of shoulder, and the shoulder of protuberance engages with the shoulder of groove.

4. by the rotor arrangement of claim 1, wherein, each dividing plate also is included in the concave part that protuberance is provided with below, so that this concave part is admitted second rotor head and outer periphery part.

5. by the rotor arrangement of claim 4, wherein, second rotor head has thickness T, and concave part has height H, wherein, and H 〉=T.

6. by the rotor arrangement of claim 1, wherein, the first rotor head is fixed by welding on the rotor post.

7. by the rotor arrangement of claim 1, wherein, the first rotor head comprises outside portion and following outside portion, and following outside portion radially extends to outside the outside portion, to limit the shelf of supporting baffle.

8. press the rotor arrangement of claim 7, wherein, the groove that the last outside portion of the first rotor head limits a plurality of circle spacings and radially extends, there is protuberance the following inside portion of each dividing plate, and each protuberance is mounted in engagement with in the groove of one of them.

9. by the rotor arrangement of claim 8, wherein, each groove comprises inside portion and outside portion, and the inside portion of each groove limits a pair of shoulder.

10. by the rotor arrangement of claim 9, wherein, each protuberance limits a pair of shoulder, and the portion of protuberance engages with the shoulder of groove.

11. the rotor arrangement of rotary regenerative air preheater has the vertical rotor pillar, this rotor post has bottom and top, and this rotor arrangement comprises:

The first rotor head, it is fixed to the bottom of rotor post and last Outboard Sections is arranged and following Outboard Sections, and following Outboard Sections radially extends to outside the Outboard Sections to limit a shelf;

Second rotor head, its limits axial hole so that the top of mounting column slidably, and the T-slot that has outer periphery part, this outer periphery partly to limit a plurality of circle spacings and radially extend; With

A plurality of dividing plates that radially extend and limit rotor region, each dividing plate has last inside part and following inside part, the following inside part of each dividing plate engages with the shelf of the first rotor head, and the last inside part of each dividing plate has protuberance, in the groove that each protuberance one of can be mounted in it with engaging.

12. by the rotor arrangement of claim 11, wherein, each protuberance limits a pair of shoulder, and each groove limits a pair of shoulder, the shoulder of protuberance engages with the shoulder of groove, outwards moves to prevent dividing plate.

13. by the rotor arrangement of claim 11, in being total to, second rotor head has thickness T, each dividing plate also comprises concave part, and this concave part has height H and is arranged on below the protuberance, wherein, and H 〉=T.

14. the rotor arrangement of claim 11, wherein, the groove that the last outside portion of the first rotor head limits a plurality of circle spacings and radially extends, the following inside part of each dividing plate has protuberance, in the groove that each protuberance one of can be mounted in it with engaging.

15. by the rotor arrangement of claim 14, wherein, each protuberance limits a pair of shoulder, the shoulder of protuberance engages with the shoulder of groove.

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