阅读说明：本技术 一种空气预热器用密封装置 (Sealing device for air preheater ) 是由 马强 于 2021-09-02 设计创作，主要内容包括：本发明涉及一种空气预热器用密封装置,属于预热器技术领域,包括转子隔舱板；密封板,通过多个软固定机构与所述转子隔舱板相连,当密封板受力超过阈值时相对转子隔舱板滑动。本发明密封板在负荷不变即热变形不变的情况下,密封板不发生相对滑动动作,只有在负荷变化热变形变化的情况下,密封板才会在导向装置的驱动下调整密封位置；密封与基准之间长期保持预设间隙,不存在接触现象即不存在摩擦损耗及摩擦能耗；可提高锅炉效率、降低一二次风机出力能耗,有很重要的节能意义,可大大降低空预器内部结构风蚀危害,可提高空预器内部结构的使用寿命。(The invention relates to a sealing device for an air preheater, which belongs to the technical field of preheaters and comprises a rotor compartment plate; and the sealing plate is connected with the rotor compartment plate through a plurality of soft fixing mechanisms and slides relative to the rotor compartment plate when the stress of the sealing plate exceeds a threshold value. The sealing plate does not slide relatively under the condition that the load, namely the thermal deformation, is not changed, and only under the condition that the thermal deformation is changed due to the change of the load, the sealing position of the sealing plate can be adjusted under the driving of the guide device; a preset gap is kept between the seal and the reference for a long time, and no contact phenomenon exists, namely no friction loss and friction energy consumption exist; the efficiency of the boiler can be improved, the output energy consumption of the primary and secondary fans can be reduced, the energy-saving significance is very important, the wind erosion harm of the internal structure of the air preheater can be greatly reduced, and the service life of the internal structure of the air preheater can be prolonged.)

1. A sealing device for an air preheater, comprising:

a rotor bay plate;

and the sealing plate is connected with the rotor compartment plate through a plurality of soft fixing mechanisms and slides relative to the rotor compartment plate when the stress of the sealing plate exceeds a threshold value.

2. The sealing device for an air preheater according to claim 1, wherein the soft fixing mechanism includes:

one end of the pre-tightening bolt penetrates through the sealing plate and the rotor compartment plate;

the pre-tightening nut is sleeved outside the pre-tightening bolt, is in threaded connection with the pre-tightening bolt, and is used for being matched with the pre-tightening bolt to connect the sealing plate and the rotor compartment plate;

and the pre-tightening spring is sleeved outside the pre-tightening bolt and is arranged at one end of the pre-tightening bolt, which is far away from the pre-tightening nut.

3. The sealing device for an air preheater according to claim 2, wherein the soft fixing mechanism further includes:

and the protective sleeve is sleeved outside the pre-tightening bolt and the pre-tightening spring, and one end of the protective sleeve is arranged between the pre-tightening spring and the sealing plate.

4. The sealing device for an air preheater according to claim 3, wherein said protective sleeve is made of a heat-resistant material.

5. The sealing device for an air preheater according to claim 3, wherein the soft fixing mechanism further includes:

and the backing plate is sleeved outside the pre-tightening bolt and is arranged between the rotor compartment plate and the pre-tightening nut.

6. The sealing device for an air preheater according to claim 5, wherein said pad is made of a heat-resistant material.

Technical Field

The invention relates to the technical field of preheaters, in particular to a sealing device for an air preheater.

Background

The air preheater is a heating surface for preheating air before entering the boiler to a certain temperature by smoke in a flue at the tail part of the boiler through internal radiating fins, and is equipment for improving the heat exchange performance of the boiler and reducing energy consumption. Air preheaters are generally classified into plate type, rotary type and tubular type.

The relative rotation position of air heater is many, and all are the sound sealed and operating mode environment than harsh, and the main area that leaks out has following several parts. The air leakage in the radial direction between the hot primary air and the flue gas side, the air leakage in the diameter direction between the hot secondary air and the flue gas, the air leakage in the diameter direction between the cold primary air and the flue gas side, the air leakage in the diameter direction between the cold secondary air and the flue gas, the air leakage in the diameter direction between the cold end and the hot end between the primary air and the flue gas, the air leakage in the height direction between the secondary air and the flue gas side, the air leakage in front of the rotor and an air preheater shell ring plate, the air leakage between a central rotating structure and a fixed structure and the like.

The existing fan-shaped plate adjusting device is only suitable for the air leakage between the hot end primary and secondary air with the most serious air leakage and the flue gas and the primary and secondary air, the system is complicated, and the accuracy and the service life of feedback information from a feedback device are seriously tested in a severe working condition environment; in addition, the shape of the rotor deformed by heat is complex, which is called mushroom shape in the industry, so that the gap between the sealing piece and the sector plate is difficult to be uniform and controllable by adjusting the sector plate. The clearance self-compensation technology is only suitable for the air leakage between the hot end secondary air with the most serious air leakage and the flue gas and the secondary air; the compensation device can compensate in place under the full load condition of the boiler in theoretical design, and the installation reserved gap between the sector plate and the sealing plate cannot be met under the non-full load condition. The contact seal is used between a secondary air chamber at the cold end and the hot end, and the secondary air and the smoke side are radially sealed; because the sealing slide block and the sector plate are in a contact sliding state under the action of the return spring, and the contact sliding friction force is different under the condition of the load change of the boiler; the fan-shaped plate or the sealing slide block can be continuously worn and consumed after long-time running; the resetting mechanism is always in the reciprocating operation of compression resetting, and the mechanism has the risk of damage failure.

Disclosure of Invention

The present invention is directed to a sealing device for an air preheater to solve the above problems.

In order to achieve the purpose, the invention provides the following technical scheme:

a sealing device for an air preheater comprising:

a rotor bay plate;

and the sealing plate is connected with the rotor compartment plate through a plurality of soft fixing mechanisms and slides relative to the rotor compartment plate when the stress of the sealing plate exceeds a threshold value.

As a further technical solution of the present invention, the soft fixing mechanism includes:

one end of the pre-tightening bolt penetrates through the sealing plate and the rotor compartment plate;

the pre-tightening nut is sleeved outside the pre-tightening bolt, is in threaded connection with the pre-tightening bolt, and is used for being matched with the pre-tightening bolt to connect the sealing plate and the rotor compartment plate;

and the pre-tightening spring is sleeved outside the pre-tightening bolt and is arranged at one end of the pre-tightening bolt, which is far away from the pre-tightening nut.

As a further technical solution of the present invention, the soft fixing mechanism further includes:

and the protective sleeve is sleeved outside the pre-tightening bolt and the pre-tightening spring, and one end of the protective sleeve is arranged between the pre-tightening spring and the sealing plate.

As a still further aspect of the present invention, the protective sheath is made of a heat-resistant material.

As a further technical solution of the present invention, the soft fixing mechanism further includes:

and the backing plate is sleeved outside the pre-tightening bolt and is arranged between the rotor compartment plate and the pre-tightening nut.

As a still further aspect of the present invention, the pad is made of a heat-resistant material.

Compared with the prior art, the invention has the beneficial effects that:

1. the sealing plate does not slide relatively under the condition that the load, namely the thermal deformation, of the sealing plate is not changed, and only under the condition that the thermal deformation is changed due to the change of the load, the sealing position of the sealing plate can be adjusted under the driving of the guide device;

2. a preset gap is kept between the seal and the reference for a long time, and no contact phenomenon exists, namely no friction loss and friction energy consumption exist;

3. the efficiency of the boiler can be improved, the output energy consumption of the primary and secondary fans can be reduced, the significance of energy conservation is very important, the wind erosion harm of the internal structure of the air preheater can be greatly reduced, and the service life of the internal structure of the air preheater can be prolonged;

4. the application range is expanded, the air leakage control between the cold end, the hot end and the axial primary and secondary air and between the smoke and the primary and secondary air is realized, the control points are increased, and the control effect is improved to some extent.

Drawings

FIG. 1 is a front view of a sealing device for an air preheater before it is heated;

FIG. 2 is a cross-sectional view taken at A-A of FIG. 1;

fig. 3 is a front view of a sealing device for an air preheater after being heated.

In the figure: 1-rotor compartment plate, 2-sealing plate, 3-soft fixing mechanism, 31-pre-tightening bolt, 32-protective sleeve, 33-pre-tightening spring, 34-pre-tightening nut and 35-backing plate.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The embodiment of the present invention is realized as follows, and the sealing device for an air preheater shown in fig. 1 and 3 comprises:

a rotor compartment plate 1;

and the sealing plate 2 is connected with the rotor compartment plate 1 through a plurality of soft fixing mechanisms 3 and slides relative to the rotor compartment plate 1 when the stress of the sealing plate 2 exceeds a threshold value.

In practical application, the sealing plate 2 and the rotor compartment plate 1 are connected and fixed through the soft fixing mechanism 3, as shown in fig. 1, in practical operation, the rotor compartment plate 1 is deformed after being heated, as shown in fig. 3, as the sealing plate 2 can slide relative to the rotor compartment plate 1 when receiving external force, the sealing plate is matched with a guide device before a rotor compartment enters a sector plate and an arc door, so that sliding adjustment of the sealing plate 2 is realized, and in order to avoid self-locking of the sealing plate 2 and the rotor compartment plate 1, the guide angle of the guide device is far smaller than the relative sliding self-locking angle of the sealing plate 2 and the compartment plate; the sealing plate 2 is under the unchangeable condition of load, that is, thermal deformation is unchangeable, relative sliding action does not take place for the sealing plate 2, only under the condition that load change thermal deformation changes, just the sealing position can be adjusted under guider's drive to the sealing plate 2 makes the air preheater leak out and reduces, can improve boiler efficiency, reduce the air preheater energy consumption of exerting oneself, have very important energy-conserving meaning, but greatly reduced air preheater inner structure wind erosion harm, can improve air preheater inner structure's life.

As shown in fig. 2, as a preferred embodiment of the present invention, the soft fixing mechanism 3 includes:

one end of a pre-tightening bolt 31 penetrates through the sealing plate 2 and the rotor compartment plate 1;

the pre-tightening nut 34 is sleeved outside the pre-tightening bolt 31, is in threaded connection with the pre-tightening bolt 31, and is used for being matched with the pre-tightening bolt 31 to connect the sealing plate 2 with the rotor compartment plate 1;

the pre-tightening spring 33 is sleeved outside the pre-tightening bolt 31, and the pre-tightening spring 33 is arranged at one end, far away from the pre-tightening nut 34, of the pre-tightening bolt 31.

In one case of this embodiment, under the action of the pre-tightening force of the pre-tightening spring 33, the friction force between the sealing plate 2 and the rotor compartment plate 1 can overcome the self-gravity of the sealing plate 2 and some external forces in the operation process, and meanwhile, after the friction force exceeding the pre-tightening force is applied, the sealing plate 2 and the rotor compartment plate 1 can slide relatively, and in addition, in order to ensure the stability of the sliding, a sliding hole matched with the pre-tightening bolt 31, i.e., a sliding hole sliding up and down as shown in fig. 2, is formed in the sealing plate 2, so that the sealing plate 2 can stably slide relative to the rotor compartment plate 1; and a preset gap is kept between the seal and the reference for a long time, and the contact phenomenon, namely the friction loss and the friction energy consumption do not exist.

As shown in fig. 2, as another preferred embodiment of the present invention, the soft fixing mechanism 3 further includes:

and the protective sleeve 32 is sleeved outside the pre-tightening bolt 31 and the pre-tightening spring 33, and one end of the protective sleeve 32 is arranged between the pre-tightening spring 33 and the sealing plate 2.

In a case of this embodiment, can not advance through setting up protective sheath 32 and can protect pretension bolt 31, avoided pretension spring 33 and closing plate 2 direct contact moreover, do not advance and improved the pretension effect, improved closing plate 2's sliding stability moreover, it is preferred, for guaranteeing that protective sheath 32 can be in the stable work of back of being heated, protective sheath 32 is made by heat-resisting material.

As shown in fig. 2, as another preferred embodiment of the present invention, the soft fixing mechanism 3 further includes:

and the backing plate 35 is sleeved outside the pre-tightening bolt 31, and the backing plate 35 is arranged between the rotor compartment plate 1 and the pre-tightening nut 34.

In one aspect of the present embodiment, the fixing stability of the rotor bulkhead 1 is improved by providing a backing plate 35 in cooperation with the pre-tightening nut 34, and preferably, in order to ensure the working stability of the backing plate 35, the backing plate 35 is made of a heat-resistant material; in this embodiment, the pre-tightening nut 34 is disposed on the right side of the rotor compartment plate 1, the protection sleeve 32 is disposed on the left side of the sealing plate 2, or the pre-tightening nut 34 may be disposed on the left side of the sealing plate 2, and the protection sleeve 32 is disposed on the right side of the rotor compartment plate 1, specifically taking actual use requirements as the standard, and no specific limitation is made herein; the air leakage control device has the advantages that the application range is expanded, the air leakage control device is suitable for air leakage control between the cold end, the hot end and the axial primary and secondary air and between the smoke and the primary and secondary air, the control points are increased, and the control effect is improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.