Hot-end radial sealing device suitable for full-load working condition of air preheater

Abstract

The utility model provides a hot end radial sealing device suitable for the full-load working condition of an air preheater, and belongs to the technical field of air preheater sealing. A fixed clamping plate is arranged on the left side of a gap between a fan-shaped bin plate and a cantilever steel plate, and a sealing clamping plate is arranged on the right side; a gap filling sheet is further arranged between the two fixed clamping plates on the outer side of the cantilever steel plate; the outer sides of the upper portions of the fan-shaped bin plates are fixed to the lower sides of the sealing clamping plates through bolts, and the outer sides of the lower portions of the cantilever steel plates are fixed to the upper sides of the sealing clamping plates through limiting bolts. A mechanical structure is adopted, a complex control system and a speed reduction device are omitted, the whole device adopts a bolt and steel plate combination mode, installation, overhaul and disassembly are convenient and fast, extra operation and maintenance work is not needed in unit operation, and the sealing gap of the structure cannot be changed along with unit load adjustment and can be kept constant all the time.

Description

Technical Field

[0001] The utility model relates to the technical field of air preheater seals, and particularly relates to a hot-end radial seal device applicable to the full-load working condition of an air preheater. Background Technique

[0002] As one of the performance assessment indicators, the air leakage rate of the air preheater is of great significance. An excessive air leakage rate will increase the power consumption of the forced draft fan, induced draft fan, and primary air fan, affecting the economic benefits of the unit. In addition, excessive air leakage will also cause insufficient combustion air volume in the furnace, resulting in an increase in the mechanical and chemical incomplete combustion heat losses of the boiler, and even restricting the boiler output.

[0003] At present, the main method for controlling air leakage in the preheater is a combined configuration scheme of an air leakage control system + flexible seals. Most of the flexible seals adopt the spring hinge principle. By compressing / popping up the hinge, a small sealing gap between the compensating sheet and the sealing surface is ensured. The main common problem of the air leakage control system is the low lifting / lowering rate. The adjustment time from full load to half load is usually 10 - 15 minutes, which cannot adapt to the rapid load increase and decrease of the unit. At the same time, this equipment has a large number of electric control devices, resulting in a large amount of daily operation and maintenance work. The flexible seal material is relatively hard, which will cause wear on the sealing surface after long-term operation. At the same time, the preheater is in an environment with high temperature and large ash content. After running for a period of time, problems such as failure and shedding of the spring hinges of the flexible seals occur, losing the sealing effect. In extreme cases, the shedding of the flexible seals causes the unit to shut down. This scheme has problems such as a complex control system, a large amount of operation and maintenance work, and a short service life of the flexible seals. Based on this, a hot-end radial seal device applicable to the full-load working condition of the air preheater has been developed. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a hot-end radial seal device applicable to the full-load working condition of the air preheater, fundamentally solving the problems of slow lifting rate of the air leakage control system and flexible seals, short service life of the flexible seals, and large amount of operation and maintenance work.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A hot-end radial sealing device applicable to the full-load condition of an air preheater. The hot-end radial sealing device applicable to the full-load condition of the air preheater includes a cantilever steel plate, a fixed clamping plate, a gap-filling piece, a sealing clamping plate and a limit bolt. The upper part of the sector bin plate of the air preheater is opposite to the lower part of the cantilever steel plate; a fixed clamping plate is arranged on the left side of the gap between the sector bin plate and the cantilever steel plate, and a sealing clamping plate is arranged on the right side; the outer side of the upper part of the sector bin plate is fixed to the lower side of the fixed clamping plate by bolts, the outer side of the lower part of the cantilever steel plate is fixed to the upper side of the fixed clamping plate by bolts, and a gap-filling piece is also arranged between the two fixed clamping plates on the outer side of the cantilever steel plate; the outer side of the upper part of the sector bin plate is fixed to the lower side of the sealing clamping plate by bolts, and the outer side of the lower part of the cantilever steel plate is fixed to the upper side of the sealing clamping plate by limit bolts.

[0007] In a hot-end radial sealing device of the present utility model applicable to the full-load condition of an air preheater, the thickness of the cantilever steel plate is less than that of the sector bin plate, and the gap between the cantilever steel plate and the two sealing clamping plates is 0-2 mm.

[0008] In a hot-end radial sealing device of the present utility model applicable to the full-load condition of an air preheater, the gap between the cantilever steel plate and the two fixed clamping plates is compensated by the gap-filling piece.

[0009] In a hot-end radial sealing device of the present utility model applicable to the full-load condition of an air preheater, both sides of the sealing clamping plate are bent outwards.

[0010] In a hot-end radial sealing device of the present utility model applicable to the full-load condition of an air preheater, the size of the fixed clamping plate is 1000 mm×150 mm, and the thickness is 10 mm.

[0011] In a hot-end radial sealing device of the present utility model applicable to the full-load condition of an air preheater, the thickness of the sealing clamping plate is 5 mm.

[0012] In a hot-end radial sealing device of the present utility model applicable to the full-load condition of an air preheater, a kidney-shaped hole is arranged at the lower part of the cantilever steel plate and is fixed to the limit hole on the upper side of the sealing clamping plate by a limit bolt.

[0013] In a hot-end radial sealing device of the present utility model applicable to the full-load condition of an air preheater, the materials of both the fixed clamping plate and the sealing clamping plate are carbon steel.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] The utility model relates to a hot-end radial sealing device applicable to the full-load working condition of an air preheater. It adopts a mechanical structure without complex control systems and reduction devices. The whole device adopts a combination of bolts and steel plates, which is convenient for installation, maintenance and disassembly. No additional operation and maintenance work is required during the operation of the unit. The device adopts the design concept of a cantilever steel plate. The cantilever steel plate is fixed to the inner side of the sector bin plate through a fixed splint. There is no temperature difference in the cantilever steel plate itself. During the operation of the unit, the cantilever steel plate can be regarded as a cantilever beam, and it is only affected by its own weight and wind pressure from the fixed end to the floating end, and the deformation amount can be ignored. This structure will not cause changes in the sealing gap with the adjustment of the unit load and can always maintain a constant sealing gap without change; it solves the problem of the low lifting / lowering rate of the air leakage control system; at the same time, this sealing structure does not have a flexible sealing spring hinge and does not need to compensate for the sealing gap through compression deformation, and there are no problems such as failure and shedding during operation. Brief Description of the Drawings

[0016] Figure 1 is the front view of a hot-end radial sealing device applicable to the full-load working condition of an air preheater according to the utility model;

[0017] Figure 2 is the side view of the middle sealing splint part of a hot-end radial sealing device applicable to the full-load working condition of an air preheater according to the utility model.

[0018] Figure 3 is the side view of the middle fixed splint part of a hot-end radial sealing device applicable to the full-load working condition of an air preheater according to the utility model.

[0019] Figure 4 is the theoretical calculation curve of gap compensation for a hot-end radial sealing device applicable to the full-load working condition of an air preheater according to the utility model.

[0020] In the figure: 1 is the sector bin plate; 2 is the cantilever steel plate; 3 is the fixed splint; 4 is the gap compensation piece; 5 is the sealing splint; 6 is the limit bolt. Detailed Embodiment

[0021] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without creative efforts shall fall within the protection scope of the utility model.

[0022] Embodiment 1

[0023] As Figures 1-4As shown in the figure, a hot-end radial sealing device applicable to the full-load condition of an air preheater. The hot-end radial sealing device applicable to the full-load condition of the air preheater includes a cantilever steel plate, a fixed clamping plate, a gap-filling piece, a sealing clamping plate and a limit bolt. The upper part of the sector bin plate of the air preheater is opposite to the lower part of the cantilever steel plate; a fixed clamping plate is arranged on the left side of the gap between the sector bin plate and the cantilever steel plate, and a sealing clamping plate is arranged on the right side; the outer side of the upper part of the sector bin plate is fixed to the lower side of the fixed clamping plate by bolts, the outer side of the lower part of the cantilever steel plate is fixed to the upper side of the fixed clamping plate by bolts, and a gap-filling piece is also arranged between the two fixed clamping plates on the outer side of the cantilever steel plate; the outer side of the upper part of the sector bin plate is fixed to the lower side of the sealing clamping plate by bolts, and the outer side of the lower part of the cantilever steel plate is fixed to the upper side of the sealing clamping plate by limit bolts.

[0024] During use, the cantilever steel plate and the sector bin plate are connected through the fixed clamping plate and the sealing clamping plate. The fixing point of the cantilever steel plate and the sector bin plate through the fixed clamping plate is the fixed end, and the fixing point of the cantilever steel plate and the sector bin plate through the sealing clamping plate is the floating end.

[0025] During the working process, the sector bin plate is in a temperature gradient from high to low, and the bin plate will undergo mushroom-shaped deformation. The hot-end radial sealing device for the full-load condition of this application adopts the design concept of a cantilever steel plate. The cantilever steel plate is fixed to a certain position inside the sector bin plate through the fixed clamping plate. There is no temperature difference in the cantilever steel plate itself. During the operation of the unit, the cantilever steel plate can be regarded as a cantilever beam. The cantilever steel plate is only affected by its own weight and wind pressure from the fixed end to the floating end, and the deformation amount can be ignored. The deformation gap between the sector bin plate and the cantilever steel plate generated by the sector bin plate is compensated by the sealing clamping plate, reducing the air leakage at the hot end of the preheater.

[0026] For a hot-end radial sealing device of the utility model applicable to the full-load condition of an air preheater, the thickness of the cantilever steel plate is less than the thickness of the sector bin plate, and the gap between the cantilever steel plate and the two fixed clamping plates is 0 - 2 mm.

[0027] For a hot-end radial sealing device of the utility model applicable to the full-load condition of an air preheater, the gap between the cantilever steel plate and the two fixed clamping plates is compensated by the gap-filling piece. The distance between the cantilever steel plate and the fixed clamping plate is compensated by the gap-filling piece, so that the thickness of the sector bin plate is the same as the sum of the thickness of the gap-filling piece and the cantilever steel plate.

[0028] For a hot-end radial sealing device of the utility model applicable to the full-load condition of an air preheater, both sides of the sealing clamping plate are bent outward.

[0029] The utility model relates to a hot-end radial sealing device applicable to the full-load condition of an air preheater. The size of the fixed clamping plate is 1000mm×150mm, and the thickness is 10mm. Generally, the length of the fixed clamping plate is 1000mm, and the length of the sealing clamping plate is the length of the cantilever steel plate minus the length of the fixed clamping plate.

[0030] The utility model relates to a hot-end radial sealing device applicable to the full-load condition of an air preheater. The thickness of the sealing clamping plate is 5mm.

[0031] The utility model relates to a hot-end radial sealing device applicable to the full-load condition of an air preheater. A kidney-shaped hole is arranged at the lower part of the cantilever steel plate and is fixed to the limit hole on the upper side of the sealing clamping plate through a limit bolt. When the sector bin plate deforms, the movement track of the deformation of the sector bin plate is restricted through the kidney-shaped hole and the limit bolt.

[0032] The utility model relates to a hot-end radial sealing device applicable to the full-load condition of an air preheater. The materials of the fixed clamping plate and the sealing clamping plate are both carbon steel.

[0033] Embodiment 2

[0034] As Figures 1-4 shown, a hot-end radial sealing device applicable to the full-load condition of an air preheater, in combination with the mushroom-shaped deformation principle generated by the rotor in the hot state, designs a constant sealing structure to make up for the leakage gap after the deformation of the hot-state rotor and achieve the goal of a lower air leakage rate. Through the design of the hot-end radial sealing scheme for the full-load condition of the air preheater, the numerical value of the mushroom-shaped deformation of the rotor compensated by this sealing scheme in the hot state is calculated, and the goal of a lower air leakage rate level at the hot end of the preheater is achieved. As Figure 4 shown, by calculating the numerical value of the mushroom-shaped deformation of the rotor, the minimum widths of the cantilever steel plate and the sealing clamping plate are determined. According to the set length of the cantilever steel plate and considering the extreme working conditions, the specifications of the cantilever steel plate and the sealing steel plate are finally determined.

[0035] The sealing structure adopts the form of a cantilever steel plate and a sealing clamping plate. The sealing clamping plate is fixed to the sector bin plate through bolts. The thickness of the cantilever steel plate is less than that of the sector bin plate. There is a certain gap (0-2mm) between the cantilever steel plate and the two side clamping plates, and the cantilever steel plate can slide freely. To enhance the stiffness of the sealing clamping plate, the sealing clamping plate is designed as a U-shaped structure. At the same time, considering that the cantilever plate will not be dragged and fail in extreme cases, a plurality of limit bolts are arranged at the position of the sealing clamping plate. The limit bolts are fixed on the sealing clamping plate, and the cantilever steel plate is provided with kidney-shaped holes. The limit bolts pass through the kidney-shaped holes for fixation to ensure that the cantilever steel plate will not be dragged and sink when the sector bin deforms.

[0036] The fixed position is clamped by the fixed clamping plate + gap-filling piece method. The fixed clamping plate is fixed to the sector bin plate through bolts. A gap-filling piece is added to one side of the cantilever steel plate and is clamped and fixed to the two side fixed clamping plates through bolts.

[0037] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A hot-end radial seal device applicable to the full-load condition of an air preheater, characterized in that, The hot-end radial seal device applicable to the full-load condition of the air preheater comprises a cantilever steel plate (2), a fixed clamping plate (3), a gap-filling piece (4), a sealing clamping plate (5) and a limit bolt (6). The upper part of the sector bin plate (1) of the air preheater faces the lower part of the cantilever steel plate (2); a fixed clamping plate (3) is arranged on the left side of the gap between the sector bin plate (1) and the cantilever steel plate (2), and a sealing clamping plate (5) is arranged on the right side; the outer side of the upper part of the sector bin plate (1) is fixed to the lower side of the fixed clamping plate (3) by bolts, the outer side of the lower part of the cantilever steel plate (2) is fixed to the upper side of the fixed clamping plate (3) by bolts, and a gap-filling piece (4) is further arranged between the two fixed clamping plates (3) on the outer side of the cantilever steel plate (2); the outer side of the upper part of the sector bin plate (1) is fixed to the lower side of the sealing clamping plate (5) by bolts, and the outer side of the lower part of the cantilever steel plate (2) is fixed to the upper side of the sealing clamping plate (5) by a limit bolt (6).

2. The hot-end radial seal device applicable to the full-load condition of the air preheater according to claim 1, characterized in that The thickness of the cantilever steel plate (2) is less than that of the sector bin plate (1), and the gap between the cantilever steel plate (2) and the two sealing clamping plates (5) is 0-2 mm.

3. The hot-end radial sealing device applicable to the full-load condition of the air preheater according to claim 2, characterized in that, The gap between the cantilever steel plate (2) and the two fixed clamping plates (3) is compensated by the gap-filling piece (4).

4. The hot-end radial seal device applicable to the full-load condition of the air preheater according to claim 1, characterized in that, Both sides of the sealing clamping plate (5) are bent outwards.

5. The hot-end radial sealing device applicable to the full-load condition of an air preheater according to claim 1, characterized in that, The size of the fixed clamping plate (3) is 1000 mm × 150 mm, and the thickness is 10 mm.

6. The hot-end radial sealing device applicable to the full-load condition of an air preheater according to claim 1, characterized in that, The thickness of the sealing clamping plate (5) is 5 mm.

7. The hot-end radial sealing device applicable to the full-load condition of the air preheater according to claim 1, characterized in that, A kidney-shaped hole is arranged at the lower part of the cantilever steel plate (2) and fixed to the limit hole on the upper side of the sealing clamping plate (5) by a limit bolt (6).

8. The hot-end radial seal device applicable to the full-load condition of an air preheater according to claim 1, characterized in that The materials of the fixed clamping plate (3) and the sealing clamping plate (5) are both carbon steel.

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