Plate-type air pre-heater

Abstract

The invention discloses a plate-type air pre-heater, belongs to the field of air pre-heaters, solves the problem that in the prior art, the replacement and repair cost of a plate-type heat exchanger is too high after a plate sheet is damaged, and mainly adopts the technical scheme that the plate-type air pre-heater comprises a rack, sealing plates are fixed to the left side and the right side of the rack, and a heat exchange plate is fixedly connected between the sealing plates on the two sides; the heat exchange plate is formed by welding two thin plates through a plurality of welding parts, non-welded parts on the two thin plates are far away from each other to form an air cavity used for flowing air, the sealing plate is provided with a through hole connected with the air cavity, partition pieces arranged at intervals up and down are arranged in the air cavity, and the partition pieces extend to the left ends and the right ends of the thin plates in the air flowing direction. The plate type air pre-heater further comprises a blocking piece, and the blocking piece is connected with the through hole of the sealing plate or the air inlet and the air outlet of the flow air cavity in a sealed mode. The heat exchange plate is mainly used for continuously using the heat exchange plate at low cost after the plate sheet is damaged.

Description

Technical Field

[0001] The present application relates to the field of air preheaters, in particular to a plate-type air preheater. Background Art

[0002] The current design of the plate-type air preheater is that the air enters and exits through a certain plate as a channel, and the range of irregular air movement is large. This has the advantage of easy installation, but the disadvantage is that there may be local dead corners for heat exchange, that is, the air circulation in some areas is hindered, resulting in low heat exchange efficiency and possible blockage. When the plate of the traditional plate-type air preheater is damaged, resulting in internal and external leakage, the measures usually taken are to replace the entire plate or use some patches to repair the damaged parts. However, the former will increase the maintenance cost of the entire heat exchanger once the plate is damaged, while the latter will have the risk of continued damage to the plate, and the maintenance process often requires the steps of disassembling the heat exchange plate, welding, and installing the heat exchange plate, resulting in long maintenance time and long machine downtime. Air preheaters where some plates cannot be disassembled will cause huge economic losses due to the damage of one of the plates. Summary of the invention

[0003] In order to overcome the disadvantage of the prior art that the cost of replacing and repairing a plate heat exchanger after a plate is damaged is too high, the present application provides a plate-type air preheater, which can achieve the continued use of the heat exchange plate after part of the channel is blocked after the plate is damaged.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a plate-type air preheater, comprising a frame, sealing plates are fixed on the left and right sides of the frame, and a heat exchange plate is fixedly connected between the sealing plates on both sides. The heat exchange plate is formed by welding two thin plates through a plurality of welding parts, and the unwelded parts on the two thin plates are far away from each other to form an air cavity for flowing air. The sealing plate is provided with a through hole connecting the air cavity, and a partition is provided in the air cavity with an upper and lower interval arrangement. The partition extends along the air flow direction to the left and right ends of the thin plate to divide the air cavity into a plurality of independent air flow cavities. The plate-type air preheater also includes a sealing member, which is sealed and connected to the through hole of the sealing plate or to the air inlet and air outlet of the air flow cavity.

[0005] After adopting the above technical solution, the present application has the following advantages: First, by dividing the air cavity in the heat exchange plate into multiple independent air flow cavities, the traditional situation of irregular large-scale air movement is changed, which effectively reduces the occurrence of heat exchange dead corners, allowing the air to flow more orderly in each independent air flow cavity, thereby improving the heat exchange efficiency and avoiding blockage problems caused by poor air circulation. Secondly, when the plate is damaged, due to the structure of multiple independent air flow cavities, even if the thin plate corresponding to an individual air flow cavity is partially damaged, there is no need to replace the entire plate or use a patch to repair it as in the past, which involves subsequent risks. It is only necessary to use a sealing piece to seal the damaged air flow cavity with the through hole of the sealing plate or with the air inlet and outlet of the air flow cavity so that the air flow cavity can be sealed. Therefore, there is no need to shut down for a long time, and it will not affect the heat exchange efficiency of other air flow cavities, which greatly reduces the maintenance cost of the heat exchange plate after damage.

[0006] Furthermore, the blocking member is sealed and connected to the through hole of the heat exchange plate or to the air inlet and the air outlet of the air flow cavity by welding.

[0007] With the above technical solution, in terms of sealing effect, welding, as a permanent connection method, can form an extremely tight and reliable sealing structure. Compared with other sealing methods such as snaps and sealants, welding can eliminate gaps to the greatest extent and effectively prevent gas leakage at the air inlet or outlet.

[0008] Furthermore, the blocking member is composed of a cross bar and a vertical plate, the cross bar extends into the air inlet or outlet of the air flow cavity and is supported on the lower edge of the air flow cavity, and the vertical plate blocks the air inlet or outlet of the air flow cavity.

[0009] By adopting the above-mentioned technical solution, when the plate is damaged, the air inlet and outlet of the damaged air flow cavity need to be sealed. The cross bar is extended into the air inlet or outlet of the air flow cavity and supported on the lower edge of the air flow cavity, providing a relatively stable fulcrum for the sealing member, effectively avoiding the problem of vertical plate position displacement or difficulty in installation due to lack of support during the sealing process, making the sealing operation more convenient.

[0010] Furthermore, the vertical plate blocks the air inlet or the air outlet by welding.

[0011] With the above technical solution, the sealing structure after welding has strong durability in terms of long-term stability. During the long-term operation of the equipment, it will be affected by many factors such as temperature changes, airflow impact and vibration of the equipment itself, but the connection formed by welding can firmly fix the vertical plate, so that it can continuously and stably block the air inlet or outlet, and there will be no problem of sealing failure due to looseness or displacement.

[0012] Furthermore, the air inlet and the air outlet of the air flow cavity are detachably connected to the blocking member.

[0013] By adopting the above-mentioned technical solution, the blocking member can still be opened and used after the heat exchange plate is repaired through a detachable connection method, thereby ensuring the blocking of the convection air cavity in an emergency situation.

[0014] Furthermore, the air inlet and the air outlet of the air flow cavity are provided with slots for clamping the sealing member.

[0015] By adopting the above technical solution, the plugging piece can be quickly installed on the air inlet and outlet through the setting of the card slot, which is convenient for plugging the air flow cavity. The design of the card slot provides a precise positioning and fixing method for the plugging piece. When the air flow cavity needs to be blocked, the operator only needs to align the plugging piece with the card slot and gently push it in to complete the installation. This convenient installation method greatly shortens the time required for the plugging operation.

[0016] Furthermore, a sealing ring is provided at the slot for sealing the gap between the sealing member and the slot.

[0017] By adopting the above technical solution, a sealing ring is arranged at the card slot, so that the sealing member and the detachable connection between the air inlet and the air outlet are more sealed. The addition of the sealing ring fills the small gap between the sealing member and the card slot to prevent gas leakage from these gaps. Whether in normal operation or in the face of pressure fluctuations, the sealing ring can always maintain close contact with the sealing member and the card slot by virtue of its elastic deformation ability, forming a reliable sealing barrier.

[0018] Furthermore, the through hole is provided with a screw opening, and the blocking member is threadedly connected to the screw opening.

[0019] By adopting the above technical solution, by setting a screw hole at the through hole, the plugging piece can block the gas flow cavity through a threaded connection. The threaded connection structure is relatively simple, and it is convenient to install and disassemble. When the through hole needs to be inspected or repaired, the plugging piece can be quickly screwed out, which improves the efficiency of equipment maintenance. At the same time, the threaded connection itself also has a certain self-locking ability, which can effectively prevent the plugging piece from loosening due to vibration and other reasons during the operation of the equipment, further ensuring the reliability of the seal and ensuring the stable operation of the plate-type air preheater under various working conditions.

[0020] Furthermore, the separator is composed of a welding line formed by connecting a plurality of welding parts.

[0021] By adopting the above-mentioned technical solution, a separator is formed by using a welding line composed of several welding parts, so that the separator does not need to use extra components to divide the air cavity, but uses the welding parts that are needed. By changing the position of the welding parts, the welding parts are connected to each other to form a continuous welding line, so that the air cavity can be divided into multiple independent air flow cavities, thereby saving production materials and reducing production costs.

[0022] Furthermore, the welding line is in a wave shape that rises and falls.

[0023] By adopting the above technical solution, the welding line is designed to be an undulating wave shape, so that the air in the air flow cavity generates turbulence when flowing through the welding line, so that the heat exchange efficiency of the air is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present application will be further described below in conjunction with the accompanying drawings: Figure 1 A schematic diagram of a plate-type air preheater for this application; Figure 2 for Figure 1 The view in the AA direction; Figure 3 for Figure 1 Cross-sectional view in the BB direction; Figure 4 It is a three-dimensional schematic diagram of a plate-type air preheater.

[0025] Description of the drawings: 1. Frame; 2. Sealing plate; 21. Through hole; 3. Heat exchange plate; 4. Thin plate; 41. Welding part; 42. Air cavity; 43. Air flow cavity; 5. Sealing piece; 51. Cross bar; 52. Vertical plate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0027] The terms "first", "second", etc. (if any) in the specification and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish before a certain technical feature, it does not necessarily indicate that it has "first". It should be understood that in this application, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in this application, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0028] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0029] Embodiment 1: like Figures 1 to 4 As shown, the present application provides a plate-type air preheater, comprising a frame 1, wherein sealing plates 2 are fixed on the left and right sides of the frame 1, and heat exchange plates 3 are fixedly connected between the sealing plates 2 on both sides, wherein the heat exchange plates 3 are formed by welding two thin plates 4 through a plurality of welding portions 41, and the unwelded portions of the two thin plates 4 are away from each other to form an air cavity 42 for flowing air, wherein the sealing plate 2 is provided with a through hole 21 connecting the air cavity 42, and a partition is provided in the air cavity 42 with an upper and lower interval arrangement, and the partition extends along the air flow direction to the left and right ends of the thin plate 4 so as to divide the air cavity 42 into a plurality of independent air flow cavities 43, and the plate-type air preheater also comprises a blocking member 5, wherein the blocking member 5 is sealed and connected to the through hole 21 of the sealing plate 2 or to the air inlet and the air outlet of the air flow cavity 43.

[0030] After adopting the above technical solution, the present application has the following advantages: first, by dividing the air cavity 42 in the heat exchange plate 3 into multiple independent air flow cavities 43, the traditional situation of irregular large-scale air movement is changed, which effectively reduces the occurrence of heat exchange dead corners, allowing air to flow more orderly in each independent air flow cavity 43, thereby improving the heat exchange efficiency and avoiding the blockage problem caused by poor air circulation. Secondly, when the plate is damaged, due to the structure of multiple independent air flow cavities 43, even if the thin plate 4 corresponding to an individual air flow cavity 43 is partially damaged, there is no need to replace the entire plate or use a patch to repair it as in the past, which has subsequent risks. It is only necessary to use the sealing member 5 to seal the damaged air flow cavity 43 with the through hole 21 of the sealing plate 2 or with the air inlet and outlet of the air flow cavity 43, so that the air flow cavity 43 is blocked. Therefore, there is no need to shut down for a long time, and it will not affect the heat exchange efficiency of other air flow cavities 43, which greatly reduces the maintenance cost of the heat exchange plate 3 after damage.

[0031] Specifically, the blocking member 5 is similar to a welded plate, and is used to weld and cover the through hole 21 or the air inlet and the air outlet of the air flow cavity 43 .

[0032] Furthermore, the blocking member 5 is sealed and connected to the through hole 21 of the heat exchange plate 3 or to the air inlet and the air outlet of the air flow cavity 43 by welding.

[0033] With the above technical solution, in terms of sealing effect, welding, as a permanent connection method, can form an extremely tight and reliable sealing structure. Compared with other sealing methods such as snaps and sealants, welding can eliminate gaps to the greatest extent and effectively prevent gas leakage at the air inlet or outlet.

[0034] Furthermore, the separator is composed of a welding line formed by connecting a plurality of welding parts 41 .

[0035] By adopting the above-mentioned technical solution, a separator is formed by using a welding line composed of several welding parts 41, so that the separator does not need to use extra components to separate the air cavity 42, but uses the welding parts 41 that are needed. By changing the position of the welding parts 41, the welding parts 41 are connected to each other to form a continuous welding line, so that the air cavity 42 can be divided into multiple independent air flow cavities 43, thereby saving production materials and reducing production costs.

[0036] Furthermore, the welding line is in a wave shape that rises and falls.

[0037] By adopting the above technical solution, the welding line is designed to be an undulating wave shape, so that the air in the air flow cavity 43 generates turbulence when flowing through the welding line, so that the heat exchange efficiency of the air is improved.

[0038] Embodiment 2: The difference from Example 1 is that the sealing member 5 used in the plate-type air preheater is composed of a cross bar 51 and a vertical plate 52, the cross bar 51 extends into the air inlet or outlet of the air flow cavity 43 and is supported on the lower edge of the air flow cavity 43, and the vertical plate 52 blocks the air inlet or outlet of the air flow cavity 43.

[0039] By adopting the above-mentioned technical solution, when the plate is damaged, the air inlet and outlet of the damaged air flow cavity 43 need to be sealed. The cross bar 51 extends into the air inlet or outlet of the air flow cavity 43 and is supported on the lower edge of the air flow cavity 43, providing a relatively stable fulcrum for the sealing member 5, effectively avoiding the problem of the vertical plate 52 being offset or difficult to install in place due to lack of support during the sealing process, making the sealing operation more convenient.

[0040] Specifically, Figure 2 As shown, the blocking member 5 is in a transversely arranged T-shape. By inserting the blocking member 5 into the air flow cavity to be blocked before blocking, subsequent blocking work and operation are smoother.

[0041] Furthermore, the vertical plate 52 blocks the air inlet or the air outlet by welding.

[0042] With the above technical solution, the sealing structure after welding has strong durability in terms of long-term stability. During the long-term operation of the equipment, it will be affected by many factors such as temperature changes, airflow impact and vibration of the equipment itself, but the connection formed by welding can firmly fix the vertical plate 52, so that it can continuously and stably block the air inlet or outlet, and there will be no problem of sealing failure due to looseness or displacement.

[0043] Embodiment 3: The difference from Embodiment 1 is that the blocking member 5 used in the plate-type air preheater is detachably connected to the air inlet and the air outlet of the air flow cavity 43 so that the blocking member 5 blocks the air flow cavity 43 .

[0044] By adopting the above technical solution, the blocking member 5 can still be opened and used after the heat exchange plate 3 is repaired through a detachable connection, thereby ensuring the blocking of the convection air cavity 43 in an emergency.

[0045] Furthermore, the air inlet and the air outlet of the air flow cavity 43 are provided with slots for clamping the blocking member 5 .

[0046] By adopting the above technical solution, the plugging member 5 can be quickly installed at the air inlet and the air outlet through the setting of the card slot, which is convenient for plugging the air flow cavity 43. The design of the card slot provides a precise positioning and fixing method for the plugging member 5. When the air flow cavity 43 needs to be blocked, the operator only needs to align the plugging member 5 with the card slot and gently push it in to complete the installation. This convenient installation method greatly shortens the time required for the plugging operation.

[0047] Furthermore, a sealing ring is provided at the slot for sealing the gap between the sealing member 5 and the slot.

[0048] By adopting the above technical solution, a sealing ring is arranged at the card slot, so that the sealing member 5 and the detachable connection between the air inlet and the air outlet are more sealed, and the addition of the sealing ring fills the small gap between the sealing member 5 and the card slot to prevent gas leakage from these gaps. Whether in normal operation or in the face of pressure fluctuations, the sealing ring can always maintain close contact with the sealing member 5 and the card slot by virtue of its elastic deformation ability, forming a reliable sealing barrier.

[0049] Specifically, the sealing member 5 in this embodiment is similar to an end cover, having a portion extending into the air flow cavity and a portion covering the air inlet and air outlet of the air flow cavity, which can provide a better sealing effect and can press the air inlet of the air flow cavity under the pressure of the air flow to improve the sealing performance.

[0050] Embodiment 4: The difference from Embodiment 1 is that the through hole 21 is provided with a screw hole, and the blocking member 5 is threadedly connected to the screw hole.

[0051] By adopting the above technical solution, by setting a screw hole at the through hole 21, the plugging member 5 can plug the gas flow cavity 43 through a threaded connection. The threaded connection structure is relatively simple, and installation and disassembly are relatively convenient. When the through hole 21 needs to be inspected or repaired, the plugging member 5 can be quickly screwed out, thereby improving the efficiency of equipment maintenance. At the same time, the threaded connection itself also has a certain self-locking ability, which can effectively prevent the plugging member 5 from loosening due to vibration and other reasons during the operation of the equipment, further ensuring the reliability of the seal and ensuring the stable operation of the plate-type air preheater under various working conditions.

[0052] Specifically, the through hole 21 and the blocking member 5 in this embodiment are both circular, so that the blocking member 5 can be smoothly connected through threaded connection.

[0053] In addition to the above-mentioned preferred embodiments, the present application also has other implementation modes. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present application.

Claims

1. A plate-type air preheater, comprising a frame, sealing plates are fixed on the left and right sides of the frame, a heat exchange plate is fixedly connected between the sealing plates on both sides, the heat exchange plate is welded by two thin plates through a plurality of welding parts, the unwelded parts of the two thin plates are separated from each other to form an air cavity for flowing air, the sealing plate is provided with a through hole connected to the air cavity, characterized in that, The air cavity is provided with partitions spaced apart up and down, and the partitions extend to the left and right ends of the thin plate along the air flow direction to divide the air cavity into multiple independent air flow cavities. The plate-type air preheater also includes a sealing member, which is sealed and connected to the through hole of the sealing plate or to the air inlet and outlet of the air flow cavity.

2. A plate type air preheater according to claim 1, characterized in that: The blocking piece is sealed and connected to the through hole of the sealing plate or to the air inlet and the air outlet of the air flow cavity by welding.

3. A plate type air preheater according to claim 1, characterized in that: The blocking member is composed of a crossbar and a vertical plate. The crossbar extends into the air inlet or outlet of the air flow cavity and is supported on the lower edge of the air flow cavity. The vertical plate blocks the air inlet or outlet of the air flow cavity.

4. A plate type air preheater according to claim 3, characterized in that: The vertical plate blocks the air inlet or the air outlet by welding.

5. A plate type air preheater according to claim 1, characterized in that: The air inlet and the air outlet of the air flow cavity are detachably connected to the blocking member.

6. A plate type air preheater according to claim 5, characterized in that: The air inlet and the air outlet of the air flow cavity are provided with clamping grooves for clamping the blocking piece.

7. A plate type air preheater according to claim 6, characterized in that: The slot is provided with a sealing ring for sealing the gap between the sealing member and the slot.

8. The plate type air preheater according to claim 1, characterized in that: The through hole is provided with a screw opening, and the blocking piece is threadedly connected to the screw opening.

9. A plate type air preheater according to claim 1, characterized in that: The separator is composed of a welding line formed by connecting a plurality of welding parts.

10. A plate type air preheater according to claim 9, characterized in that: The welding line is in a wave shape that rises and falls.

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