Air preheater sealing device with running-in sheets easy to replace and mounting structure of air preheater sealing device

Abstract

The utility model discloses an air preheater sealing device with a running-in piece easy to replace and an installation structure of the air preheater sealing device. The sealing device comprises a metal base material piece, a metal clamping piece, the running-in piece and a clamping pressing plate. The metal base material sheet is in a long strip shape, and the metal clamping sheet is connected to one face of the metal base material sheet in the length direction. The clamping pressing plate is detachably connected to the face, opposite to the metal base material piece, of the metal clamping piece in the length direction, namely the metal clamping piece is located between the metal base material piece and the clamping pressing plate. The top of the metal clamping piece is lower than the top of the metal base material piece and the top of the clamping pressing plate at the same time. The bottom of the running-in piece is detachably connected to the top of the metal clamping piece in the length direction, and the top of the running-in piece exceeds the top of the metal base material piece and the top of the clamping pressing plate at the same time. The running-in sheet is made of soft metal or non-metal materials. According to the device, the metal sealing face is not prone to being abraded, the rotor blocking accident is not prone to being caused, the running-in piece is convenient to replace, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the sealing technical field of Ljungstrom air preheater, and relates to an air preheater sealing device and an installation structure thereof, which are easy to replace the running-in sheet. BACKGROUND

[0002] The Ljungstrom air preheater (hereinafter referred to as an air preheater) is a heat exchange device for a large power station boiler, which uses the heat of boiler flue gas to heat the air required for combustion. The air preheater rotor is composed of a large number of heat storage elements. When the rotor rotates slowly, the flue gas and the air flow through the rotor in reverse alternation, the heat storage elements absorb heat on the flue gas side and release heat on the air side, thereby achieving the preheating effect of reducing the flue gas temperature and increasing the hot air temperature, and improving the economic efficiency of the power plant.

[0003] The air preheater rotor is actually a huge cylinder. Due to the temperature difference between the upper and lower end faces and the weakening of the rigidity of the steel material after being heated, the "mushroom-shaped" deformation is generated. Therefore, when installed in the cold state, a gap needs to be reserved between the air preheater rotor and the stator. The size of the reserved gap depends on the deformation amount of each component of the air preheater, especially the deformation amount of the air preheater rotor. In principle, it is necessary to ensure that the rotor and the stator do not collide and grind under any working condition, so as to prevent the rotor from being stuck and causing safety accidents.

[0004] Since the air side pressure of the air preheater is higher than the flue gas side pressure, a sealing device is needed to reduce the leakage of air to the flue gas side to reduce energy loss. The conventional method in engineering is to install a sealing sheet on the rotor baffle. The sealing sheet and the rotor baffle are connected by bolts. The rotor baffle is generally long, and the shorter sealing sheet is connected end to end to form a complete seal. The traditional sealing sheet is a straight sheet type. A larger sealing gap and a smaller sealing sheet thickness need to be reserved during installation to ensure the safe and stable operation of the air preheater.

[0005] In order to adapt to the high temperature and high dust operating environment of the air preheater, the existing sealing sheet is made of hard metal such as carbon steel or stainless steel. Once the sealing sheet collides with the sealing surface, the sealing surface is easily permanently damaged and the rotor is easily stuck. The sealing sheet also needs to be replaced as a whole, and the operation and maintenance cost is high. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide an air preheater sealing device and an installation structure thereof, which are easy to replace the running-in sheet. Once the running-in sheet collides with the sealing surface, the soft metal or non-metal material running-in sheet contacts the sealing surface, which almost does not cause wear to the metal sealing surface and is not easy to cause the rotor to be stuck. When the local running-in sheet is damaged or difficult to meet the sealing requirements, it can be replaced locally, and only the running-in sheet needs to be replaced, without the need for overall replacement.

[0007] To solve the above technical problems, the technical scheme of the utility model is

[0008] An air preheater sealing device easy to replace the running-in piece, comprising a metal base piece, a metal clamping piece, a running-in piece and a clamping pressure plate;

[0009] One end of the metal base piece, the metal clamping piece, the running-in piece and the clamping pressure plate in the width direction is defined as the top, and the other end is defined as the bottom;

[0010] The metal base piece is in the shape of a long strip, and the metal clamping piece is connected to one side of the metal base piece along the length direction; the clamping pressure plate is detachably connected to the side of the metal clamping piece opposite to the metal base piece along the length direction (one side of the metal clamping piece faces the metal base piece and is connected together, and the other side is opposite to the metal base piece), that is, the metal clamping piece is located between the metal base piece and the clamping pressure plate; and the top of the metal clamping piece is lower than the top of the metal base piece and the top of the clamping pressure plate at the same time.

[0011] The bottom of the running-in piece is detachably connected to the top of the metal clamping piece along the length direction, and the top of the running-in piece exceeds the top of the metal base piece and the top of the clamping pressure plate at the same time; the material of the running-in piece is soft metal or non-metal material.

[0012] The top of the running-in piece exceeds the top of the metal base piece and the top of the clamping pressure plate at the same time, and when in use, once colliding with the sealing surface, the running-in piece made of soft metal or non-metal material contacts the sealing surface, which almost does not cause wear to the metal sealing surface and is not easy to cause the accident of rotor jamming; when the local running-in piece is damaged or difficult to meet the sealing requirement, the corresponding clamping pressure plate is removed, and the local replacement can be carried out, and only the running-in piece needs to be replaced, without the need of overall replacement. The device has simple structure and stable operation.

[0013] In order to facilitate disassembly and assembly, and at the same time ensure the stability of operation, the bottom of the running-in piece and the top of the metal clamping piece are detachably embedded together through the dovetail groove structure matched with each other.

[0014] In order to further improve the stability of device operation, and at the same time facilitate preparation, the thickness of the running-in piece and the metal clamping piece is equal, and the metal base piece and the clamping pressure plate are respectively and simultaneously in close contact with the metal clamping piece and the running-in piece. That is, the metal base piece is in close contact with the metal clamping piece and the running-in piece at the same time, and the clamping pressure plate is also in close contact with the metal clamping piece and the running-in piece at the same time. In this way, the metal base piece and the clamping pressure plate can stably clamp the metal clamping piece and the running-in piece, and ensure the stability of operation. Of course, the part of the top of the running-in piece exceeding the top of the metal base piece and the top of the clamping pressure plate is not in close contact with the metal base piece and the clamping pressure plate. The aforementioned close contact refers to the mutual extrusion and close contact of the adjacent surfaces.

[0015] The soft metal can be copper or aluminum or alloy thereof, etc.

[0016] The non-metal material can be polytetrafluoroethylene, polyimide or carbon fiber reinforced polyether ether ketone, and the like, and can be used in high-temperature and high-dust environments and can operate stably and durably.

[0017] In order to further improve the stability of the device, the metal base plate and the metal clamping plate are connected by welding.

[0018] The bottom of the metal base plate, the metal clamping plate and the clamping plate is flush.

[0019] The clamping plate is detachably connected to the metal clamping plate by bolts.

[0020] The air preheater sealing device is installed on the rotor radial baffle by sequentially passing through the installation bolts of the rotor radial baffle, the metal base plate, the metal clamping plate and the clamping plate, and is fixed by nuts.

[0021] The clamping plate is movably pressed on the metal clamping plate and the wear plate.

[0022] The technical features not mentioned in the utility model are prior art.

[0023] The air preheater sealing device of the utility model is simple in structure, stable in operation, convenient to disassemble and assemble, and easy to implement. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The utility model discloses an air preheater sealing device of easy replacement wear plate structure diagram for the utility model;

[0025] Figure 2 for Figure 1 Exploded view (bolts and nuts omitted);

[0026] In the diagram, 1 is a metal substrate sheet, 2 is a metal clamping plate, 3 is a break-in plate, 4 is a clamping pressure plate, 5 is a rotor radial partition, 6 is a mounting bolt, and 7 is a nut. Detailed Implementation

[0027] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0028] The directional terms used in this application, such as up and down, left and right, horizontal, vertical, top and bottom, are all based on the relative orientations or positional relationships shown in the attached drawings and should not be construed as absolute limitations on this application.

[0029] Example 1

[0030] like Figure 1 and 2 As shown, an air preheater sealing device with easily replaceable running-in plates includes a metal substrate plate 1, a metal clamping plate 2, a running-in plate 3, and a clamping pressure plate 4.

[0031] One end of the metal substrate sheet 1, the metal clamping sheet 2, the grinding sheet 3, and the clamping pressure plate 4 in the width direction is defined as the top, and the other end is defined as the bottom;

[0032] The metal substrate sheet 1 is long and narrow, and the metal clip 2 is connected to one side of the metal substrate sheet 1 along its length. The clamping plate 4 is detachably connected to the side of the metal clip 2 opposite to the metal substrate sheet 1 along its length (one side of the metal clip faces the metal substrate sheet and is connected to it, while the other side faces away from it). That is, the metal clip 2 is located between the metal substrate sheet 1 and the clamping plate 4. The top of the metal clip 2 is lower than both the top of the metal substrate sheet 1 and the top of the clamping plate 4.

[0033] The bottom of the running plate 3 is detachably connected to the top of the metal clamping plate 2 along the length direction, and the top of the running plate 3 extends beyond the top of the metal substrate 1 and the top of the clamping pressure plate 4; the material used for the running plate 3 is soft metal or non-metal.

[0034] The top of the aforementioned running plate 3 extends beyond both the top of the metal substrate plate 1 and the top of the clamping plate 4. During use, when it comes into contact with the sealing surface, the soft metal or non-metallic running plate will hardly cause wear to the metal sealing surface, and is unlikely to cause rotor jamming. When a local running plate is damaged or fails to meet sealing requirements, the corresponding clamping plate can be removed for partial replacement; only the running plate needs to be replaced, without the need for complete replacement. The device has a simple structure and stable operation.

[0035] Example 2

[0036] On the basis of Example 1, the following improvements are made: in order to facilitate disassembly and at the same time ensure the stability of operation, the bottom of the running-in sheet 3 and the top of the metal clamping sheet 2 are detachably embedded together through the matching dovetail groove structure.

[0037] Example 3

[0038] On the basis of Example 2, the following improvements are made: in order to further improve the stability of the device in operation and at the same time facilitate preparation, the thickness of the running-in sheet 3 and the metal clamping sheet 2 is equal, and the metal base sheet 1 and the clamping pressing plate 4 are respectively in close contact with the metal clamping sheet 2 and the running-in sheet 3. In this way, the metal base sheet 1 and the clamping pressing plate 4 can form stable clamping on the metal clamping sheet 2 and the running-in sheet 3, ensuring the stability of operation. Of course, the part of the top of the running-in sheet 3 that exceeds the top of the metal base sheet 1 and the top of the clamping pressing plate 4 is not in close contact with the metal base sheet 1 and the clamping pressing plate 4.

[0039] Example 4

[0040] On the basis of Example 3, the following improvements are made: in order to further improve the stability of the device in operation, the metal base sheet 1 and the metal clamping sheet 2 are connected by welding. The bottom of the metal base sheet 1, the metal clamping sheet 2 and the clamping pressing plate 4 is flush. In this example, the soft metal is copper (through experiments, it can also be aluminum or copper-aluminum alloy and other soft metals); the non-metal material is polytetrafluoroethylene with a temperature resistance of not less than 260°C (through experiments, it can also be polyimide or carbon fiber reinforced polyether ether ketone and other materials).

[0041] As shown in Figure 1 the air preheater sealing device with easy-to-replace running-in sheet is installed on the rotor radial partition plate by passing through the installation bolts of the rotor radial partition plate, the metal base sheet 1, the metal clamping sheet 2 and the clamping pressing plate 4 in turn, and is fixed by nuts; the air preheater sealing device with easy-to-replace running-in sheet is connected head to tail and covers the length direction of the rotor radial partition plate. When the local running-in sheet is worn or damaged, the corresponding nut is unscrewed, the corresponding clamping pressing plate 4 is removed, the worn or damaged running-in sheet is replaced, and then the corresponding clamping pressing plate is installed back and fixed with nuts.

[0042] The clamping pressing plate 4 is movably pressed on the metal clamping sheet 2 and the running-in sheet 3. That is, no separate bolts are provided between the clamping pressing plate 4 and the metal clamping sheet 2 and the running-in sheet 3. The clamping pressing plate is pressed on the metal clamping sheet and the running-in sheet under the action of the installation bolts and nuts.

[0043] The air preheater sealing device with the easily replaceable rubbing-in piece has simple structure, stable operation, convenient disassembly and assembly, and easy implementation; once rubbing with the sealing surface, the soft metal or non-metal material rubbing-in piece contacts the sealing surface, and almost no damage to the metal sealing surface is caused, and the rotor is not easily stuck; when the local rubbing-in piece is worn or damaged, the corresponding clamping pressure plate is disassembled, the worn or damaged rubbing-in piece is replaced, and then the corresponding clamping pressure plate is assembled, so that the whole is not replaced, the operation is simple, and the cost is low.

[0044] The above examples do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. An air preheater seal assembly that is easy to replace the wearing piece, characterized in that: The air preheater sealing device comprises a metal base sheet (1), a metal clamp sheet (2), a running-in sheet (3) and a clamping plate (4). One end of the metal base sheet (1), the metal clamp sheet (2), the running-in sheet (3) and the clamping plate (4) in the width direction is defined as the top, and the other end is defined as the bottom. The metal base sheet (1) is in a strip shape, the metal clamp sheet (2) is connected to one side of the metal base sheet (1) along the length direction, the clamping plate (4) is detachably connected to the side of the metal clamp sheet (2) opposite to the metal base sheet (1) along the length direction, that is, the metal clamp sheet (2) is located between the metal base sheet (1) and the clamping plate (4), and the top of the metal clamp sheet (2) is lower than the top of the metal base sheet (1) and the top of the clamping plate (4). The bottom of the running-in sheet (3) is detachably connected to the top of the metal clamp sheet (2) along the length direction, and the top of the running-in sheet (3) is higher than the top of the metal base sheet (1) and the top of the clamping plate (4), and the material of the running-in sheet (3) is soft metal or non-metal material.

2. The air preheater seal assembly with easy-to-replace running-in piece according to claim 1, characterized in that: The bottom of the running-in sheet (3) and the top of the metal clamp sheet (2) are detachably embedded together through the dovetail groove structure matched with each other.

3. The air preheater seal arrangement with easy-to-change running-in piece according to claim 1 or 2, characterized in that The thickness of the running-in sheet (3) and the metal clamp sheet (2) is equal, and the metal base sheet (1) and the clamping plate (4) are respectively and simultaneously close to the metal clamp sheet (2) and the running-in sheet (3).

4. The air preheater seal arrangement with easy-to-change running-in piece according to claim 1 or 2, characterized in that: The soft metal is copper or aluminum or its alloy.

5. The air preheater seal assembly with easy-to-replace running-in piece according to claim 1 or 2, characterized in that: The non-metal material is polytetrafluoroethylene, polyimide or carbon fiber reinforced polyether ether ketone.

6. The air preheater seal assembly with easy-to-replace running-in piece according to claim 1 or 2, characterized in that: The metal base sheet (1) and the metal clamp sheet (2) are connected by welding.

7. The air preheater seal assembly with easy-to-replace running-in piece according to claim 1 or 2, characterized in that: The bottom of the metal base sheet (1), the metal clamp sheet (2) and the clamping plate (4) is flush.

8. The air preheater seal assembly with easy-to-replace running-in piece according to claim 1 or 2, characterized in that: The clamping plate (4) is detachably connected to the metal clamp sheet (2) through bolts.

9. An installation structure of the sealing device of the air preheater with easily replaceable wearing plate according to any one of claims 1 to 8, characterized in that: The installation bolt is installed on the rotor radial partition plate (5) by sequentially penetrating the rotor radial partition plate (5), the metal base sheet (1), the metal clamp sheet (2) and the clamping plate (4), and is fixed by a nut.

10. The mounting structure according to claim 9, characterized by: The clamping plate (4) is movably pressed on the metal clamp sheet (2) and the running-in sheet (3).

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