Sealing, energy-saving and efficiency-improving device for central cylinder of air preheater

Abstract

The utility model belongs to the technical field of air preheaters, and particularly relates to a sealing, energy-saving and efficiency-improving device for a central cylinder of an air preheater, which is characterized in that an outer ring is mounted on a base arranged on the central cylinder, and an inner ring consisting of arc sections is arranged in a chute on the inner side of the outer ring; and the back surface of each arc section is connected with an elastic piece, so that the inner ring is in sealing contact with the outer wall of the central cylinder, air leakage in the air preheater is reduced, and energy conservation and efficiency improvement are facilitated. In the operation process of the air preheater, when the center cylinder shakes, the corresponding arc sections are ejected outwards in the radial direction, and when the center cylinder does not eject the arc sections outwards any more, under the action of the elastic pieces, the arc sections can continue to be in contact with the inner diameter face of the center cylinder again, and therefore the air preheater is prevented from being damaged. The elastic action type sealing structure does not generate a gap with the central cylinder due to the shaking of the central cylinder, so that the effective sealing service life is longer.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of air preheater, specifically relates to a kind of air preheater center cylinder sealing energy-saving efficiency improving device. BACKGROUND

[0002] Air preheater is the equipment using the flue gas in the tail flue of boiler to pass through the internal heat sink and preheat the air before entering the boiler to certain temperature, since the flue gas heat can be recycled by air preheater, the exhaust gas temperature is reduced, so the boiler efficiency is improved, and since the combustion air temperature is improved, it is beneficial to the ignition and combustion of fuel, reduces the loss of incomplete combustion of fuel, and is used to improve the heat exchange performance of boiler and reduce energy consumption.

[0003] When the flue gas passes through the heat storage element of air preheater, part of dust is accumulated on the heat storage element, and is carried by high-speed secondary air and primary air from bottom to top with the rotation of air preheater, in order to prevent dust leakage and air leakage, sealing device needs to be installed on air preheater. In the traditional air preheater, the sealing of the center cylinder is a flexible sealing structure of packing, which is mostly sealed by graphite packing. This sealing method has the following problems: when the unit is just put into operation, the packing structure can play a certain sealing role, but with the operation of air preheater, the rotating center cylinder will rub with graphite packing, and the shaking of center cylinder rotor will cause the gap between rotor and graphite packing, finally the sealing cavity of center cylinder is not completely closed, which is easy to accumulate dust and sundries, and the sundries can scratch the shaft neck and sealing packing during the operation of equipment, increase the sealing gap, and the hot air carrying dust will leak through the gap, and the leakage of dust further aggravates the wear of sealing structure, causing the center cylinder sealing gap to become larger and larger, and the air leakage and dust leakage gradually increase. The hazards are as follows: first, the electric consumption of air supply fan, induced draft fan and primary air fan matched with air preheater increases, which affects the normal working load of unit; second, it can cause low temperature corrosion and dust accumulation of air preheater, which further increases air leakage; third, air leakage increases the heat loss of exhaust gas, which reduces the thermal efficiency of boiler; fourth, air leakage of air preheater forces the boiler to operate at reduced load, which affects the normal working load of boiler. CONTENT OF UTILITY MODEL

[0004] The utility model aims at providing a kind of air preheater center cylinder sealing energy-saving efficiency improving device, to realize the sealing cooperation with the center cylinder of air preheater by the air preheater center cylinder sealing energy-saving efficiency improving device, so as to seal the center cylinder of air preheater, and improve the service life of effective sealing.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides an air preheater center tube sealing energy -conserving and efficiency -improving device, including the outer ring for installing on the center tube of air preheater, is equipped with at least one chute in the inner side wall of outer ring, the chute is the circumferential ring groove, is equipped with the inner ring in the chute, the inner ring is by a plurality of arc segment, the back of each arc segment of inner ring is connected with the elastic member that tops in the chute respectively, and the elastic member is used to push each arc segment of inner ring can freely yield in the chute, and makes the inner diameter surface of each arc segment of inner ring and the outer wall of center tube of air preheater contact.

[0007] Preferably, the chute is a T-shaped cross-section chute, and each arc segment of the inner ring corresponds to a T-shaped arc segment.

[0008] Preferably, three chutes are provided at intervals, and three groups of inner rings are provided correspondingly.

[0009] Preferably, the elastic member is a leaf spring.

[0010] Preferably, two leaf springs are mounted on each arc segment.

[0011] Preferably, the arc segment is made of amorphous titanium alloy.

[0012] Preferably, the end of the outer ring has comb tooth sealing teeth, and when the outer ring passes through the center tube, the inner side wall of the tooth piece of the comb tooth sealing teeth contacts the outer side wall of the center tube.

[0013] Preferably, an opening is provided on the chute for mounting the arc segment.

[0014] Compared with the prior art, the air preheater center tube sealing energy-conserving and efficiency-improving device has the following beneficial effects: the outer ring is mounted on the base provided on the center tube, the inner ring composed of arc segments is arranged in the chute on the inner side of the outer ring, and the elastic member is connected to the back of each arc segment, so that the inner ring forms a sealing contact with the outer wall of the center tube, reducing the leakage of air in the air preheater and being conducive to energy saving and efficiency improvement. During the operation of the air preheater, when the center tube shakes, the corresponding arc segment will be pushed outward in the radial direction, and when the center tube no longer pushes the arc segment outward, the arc segment can continue to contact the inner diameter surface of the center tube under the action of the elastic member. The elastic sealing structure does not produce a gap between the center tube due to the shaking of the center tube, thereby having a longer effective sealing life. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0016] Figure 1This is a schematic diagram of the installation of the central cylinder of the air preheater central cylinder sealing energy-saving and efficiency-improving device according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the arc segment in one embodiment of the energy-saving and efficiency-enhancing device for sealing the central cylinder of the air preheater according to this utility model.

[0018] Figure 3 for Figure 2 AA sectional view.

[0019] Figure 4 This is a schematic diagram of the inner ring structure in one embodiment of the energy-saving and efficiency-enhancing device for sealing the central cylinder of the air preheater according to this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the inner wall of the outer ring in one embodiment of the air preheater central cylinder sealing energy-saving and efficiency-improving device of this utility model.

[0021] In the diagram, the labels are as follows: outer ring 1, slide groove 11, opening 111, inner ring 2, arc segment 21, elastic element 3, central cylinder 4, base 5, and toothed plate 6. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In one embodiment, an energy-saving and efficiency-enhancing device for sealing the central cylinder of an air preheater is provided, such as... Figures 1-4 As shown, the energy-saving and efficiency-enhancing device for sealing the central cylinder of the air preheater includes an outer ring 1 for installation on the central cylinder 4 of the air preheater. The central cylinder 4 rotates relative to the outer ring 1. A base 5 is provided on the central cylinder 4, and the outer ring 1 is supported on the base 5. A groove 11 is provided on the inner wall of the outer ring 1. The groove 11 is a circumferential annular groove. An inner ring 2 is provided in the groove 11. The inner ring 2 is used to form a seal with the outer wall surface of the central cylinder 4. The inner ring 2 consists of multiple... Figure 2The arc segments 21 shown constitute an annular inner ring 2 matched with the center cylinder 4, and the back of each arc segment 21 of the inner ring 2 is connected with an elastic member 3 that is propped in the sliding groove 11. During the operation of the air preheater, the center cylinder 4 will slightly shake to push the inner ring 2, and the elastic member 3 can make the inner ring 2 freely retreat in the radial direction in the sliding groove 11 when the center cylinder 4 slightly shakes to push the inner ring 2, and make the inner diameter surface of each arc segment 21 of the inner ring 2 contact with the outer wall of the center cylinder 4 of the air preheater with slight contact force, which meets certain sealing performance while avoiding damage to the outer wall of the center cylinder 4. Specifically, when the center cylinder 4 shakes, it will push a certain arc segment 21 outward in the radial direction, at which time the arc segment 21 that is pushed outward will retreat outward in the radial direction and make the elastic member 21 be compressed. When the center cylinder 4 no longer pushes the arc segment 21 outward, the elastic member 3 exerts a radial inward elastic force on the arc segment 21 under the action of the restoring force of the elastic member 3, so that the inner diameter surface of the arc segment 21 restores the contact with the outer wall of the center cylinder 4. Under the action of the elastic member 3, the inner ring 2 has zero clearance with the center cylinder 4, which isolates the internal hot air and dust from the external atmosphere. The sliding groove provided on the inner side of the outer ring 1 is at least one, and the more the number of sliding grooves and the corresponding number of inner ring channels, the better the sealing performance. In the embodiment, three sliding grooves 11 are provided at intervals, and three groups of inner rings 2 are provided correspondingly. The provision of three sliding grooves 11 and three groups of inner rings 2 can guarantee the sealing performance while controlling the processing cost.

[0024] The working principle of the air preheater center cylinder sealing energy-saving and efficiency-improving device is as follows. During the operation of the air preheater, the center cylinder 4 acts as a rotor to drive the heat transfer fins installed thereon to rotate, and the outer ring 1 is used to connect with the non-rotating parts of the air preheater shell and the like to support the non-rotating parts. The outer ring 1 is installed on the base 5 provided on the center cylinder 4, the inner ring 2 composed of arc segments 21 is provided in the sliding groove 11 on the inner side of the outer ring 1, and the elastic member 3 is connected to the back of each arc segment 21, so that the inner ring 2 forms a sealed contact with the outer wall of the center cylinder 4, thereby reducing the air leakage in the air preheater and being conducive to energy saving and efficiency improvement. Since the corresponding arc segment 21 will be pushed outward in the radial direction when the center cylinder 4 shakes during the operation of the air preheater, the arc segment 21 can continue to contact the inner diameter surface of the center cylinder 4 under the action of the elastic member 3 when the center cylinder 4 no longer pushes the arc segment 21 outward. This elastic action type sealing structure will not have a gap between the center cylinder 4 due to the shaking of the center cylinder 4, thereby having a longer effective sealing life.

[0025] Further, in another embodiment, as shown in Figures 1-4 the sliding groove 11 provided on the inner side of the outer ring 1 in the air preheater center cylinder sealing energy-saving and efficiency-improving device is a T-shaped cross-section sliding groove, and each arc segment 21 of the inner ring 2 is correspondingly a T-shaped arc segment. This shape design makes the arc segment 21 of the inner ring 2 be able to be embedded in the sliding groove 11 without falling off, and the arc segment 21 can move in the radial direction in the sliding groove 11.

[0026] Furthermore, in another embodiment, such as Figure 5 As shown, the slide groove 11 of the air preheater center cylinder sealing energy-saving and efficiency-improving device is provided with an opening 111 for inserting the arc segment 21. The opening 111 is an arc-shaped groove segment with the same width as the widest part of the other parts of the slide groove 11 and an arc length equal to or slightly greater than the arc length of an arc segment 21. Compared with the other parts of the T-shaped slide groove 11, the opening 111 has a rectangular cross section, which can accommodate the entire arc segment 21. Then, the arc segment 21 is rotated circumferentially to other positions of the slide groove 11, thus completing the installation of all arc segments 21.

[0027] Furthermore, in another embodiment, such as Figures 1-3 As shown, the elastic element 3 in the central cylinder sealing energy-saving and efficiency-enhancing device of the air preheater is specifically a leaf spring. The leaf spring is arc-shaped, and its two ends are connected to the arc segment 21 by screws. Two elastic elements 3 are installed on the back of each arc segment 21, forming a stable support on the back through the two elastic elements 3. The arc segment 21 is made of amorphous titanium alloy, which has good wear resistance.

[0028] Furthermore, in another embodiment, such as Figure 1 As shown, the outer ring 1 of the air preheater central cylinder sealing energy-saving and efficiency-enhancing device has comb-tooth sealing teeth at its end. The comb-tooth sealing teeth have two toothed plates 6. When the outer ring 1 passes through the central cylinder 4, the inner sidewall of the toothed plate 6 of the comb-tooth sealing teeth contacts the outer sidewall of the central cylinder 4. The two comb-tooth sealing teeth prevent impurities from entering the sealing device. The inner edge of the toothed plate 6 gradually thins, so that when the central cylinder 4 shakes and squeezes the toothed plate 6, the inner edge of the toothed plate 6 can adapt to deformation and recover.

[0029] Based on the above embodiments, it can be seen that the air preheater central cylinder sealing energy-saving and efficiency-improving device installs an outer ring 1 on a base 5 set on the central cylinder 4, and sets an inner ring 2 composed of arc segments 21 in the sliding groove 11 on the inner side of the outer ring 1. Elastic members 3 are connected to the back of each arc segment 21, so that the inner ring 2 can make slight contact with the outer wall of the rotor (central cylinder 4), so that the contact force between the inner ring 2 and the rotor is not too large, avoiding damage to the rotor. This device greatly reduces the leakage of air and ash, thereby reducing the air preheater leakage rate, improving efficiency, and reducing the power consumption of the induced draft fan, primary air fan, and blower, saving factory electricity.

[0030] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0031] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving and efficiency-enhancing device for sealing the central cylinder of an air preheater, comprising an outer ring for installation on the central cylinder of the air preheater, characterized in that: At least one sliding groove is provided on the inner sidewall of the outer ring. The sliding groove is a circumferential annular groove. An inner ring is provided in the sliding groove. The inner ring is composed of multiple arc segments. Each arc segment of the inner ring is connected to an elastic element that is pushed in the sliding groove on its back side. The elastic element is used to push each arc segment of the inner ring to move freely in the sliding groove and to make the inner diameter surface of each arc segment of the inner ring contact with the outer wall of the central cylinder of the air preheater. The groove is a T-shaped cross-section groove, and each arc segment of the inner ring corresponds to an arc segment of the T-shaped cross-section; The elastic element is specifically a leaf spring; The outer ring has comb-shaped sealing teeth at its end, and when the outer ring passes through the central cylinder, the inner sidewall of the comb-shaped sealing teeth contacts the outer sidewall of the central cylinder. The groove is provided with an opening for inserting the arc segment.

2. The air preheater central cylinder sealing energy-saving and efficiency-improving device according to claim 1, characterized in that: The slide groove is provided with three intervals, and the inner ring is provided with three sets accordingly.

3. The air preheater central cylinder sealing energy-saving and efficiency-improving device according to claim 1, characterized in that: Each of the arc segments is equipped with two leaf springs.

4. The air preheater central cylinder sealing energy-saving and efficiency-improving device according to claim 1, characterized in that: The arc segment is made of amorphous titanium alloy.

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