Combined air preheater

Abstract

The utility model relates to the technical field of preheating devices, and discloses a combined air preheater which comprises a high-temperature-section air preheater and a low-temperature-section air preheater located below the high-temperature-section air preheater, turnups are arranged on the peripheral side walls of the connecting positions of the high-temperature-section air preheater and the low-temperature-section air preheater, the upper turnup and the lower turnup are jointly sleeved with a sealing jacket, and the upper turnup and the lower turnup are both provided with an air inlet and an air outlet. The sealing jacket comprises two long jackets parallel to the length direction of the flange, two wide jackets parallel to the width direction of the flange and an arc-shaped jacket hinged between the long jackets and the wide jackets, the size of the arc-shaped jacket is matched with that of the corner of the flange, and a locking piece is arranged between the end parts, connected end to end, of the sealing jacket. The mounting structure has the effect of improving the mounting efficiency of the combined air preheater.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of preheating devices, in particular to a combined air preheater. BACKGROUND

[0002] An air preheater is a preheating device that improves the heat exchange performance of a boiler and reduces heat loss. The air preheater functions to transfer the heat carried by flue gas discharged from the tail of the boiler to the air entering the boiler through heat dissipation fins, so as to preheat the air to a certain temperature, thereby strengthening the combustion process in the furnace and improving the combustion efficiency.

[0003] A layered combined air preheater combines multiple separate preheater units together to form heat exchange regions of different temperature levels. Through heat transfer between different levels, heat energy can be more effectively utilized, and overall heat exchange efficiency can be improved.

[0004] In the prior art, the combined air preheater adopts a flange and bolt connection mode to realize the installation and fixation between the upper and lower two groups of air preheaters. However, after long-term use, the bolts used for connection will age, causing the connection between the combined air preheaters to loosen. This not only leads to heat loss but also causes flue leakage, thereby increasing the risk of low-temperature corrosion of the combined air preheater.

[0005] A combined air preheater is disclosed in Chinese Patent No. CN228379477U, which includes an air preheater one and an air preheater two. Threaded rods are installed on the inner surfaces of the upper ends of the air preheater one and the air preheater two. Vertical clamping plates are clamped to the inner surfaces of the upper ends of the air preheater one and the air preheater two. A connecting turn plate is arranged on the right inner surface of the air preheater two, and a horizontal clamping plate is arranged on the right inner surface of the connecting turn plate.

[0006] The above-mentioned combined air preheater enhances the firmness and tightness of the connection between the two air preheaters by comprehensively arranging multiple connection means at the connection between the two air preheaters. However, when the combined air preheater fails, maintenance personnel need to remove the multiple connecting pieces between the adjacent two air heat exchangers before installation in order to troubleshoot and replace the faulty part, which greatly affects the work efficiency of the maintenance personnel. Practical new type content

[0007] In order to improve the installation efficiency of the combined air preheater, the application provides a combined air preheater.

[0008] The combined air preheater provided by the application adopts the following technical scheme:

[0009] The utility model provides a combined air preheater, including high temperature section air preheater and low temperature section air preheater below high temperature section air preheater, and the outer peripheral side wall of the junction of high temperature section air preheater and low temperature section air preheater is provided with the turn -ups, and the common sleeve of two turn -ups on the upper and lower is provided with sealing jacket, and sealing jacket includes two parallel to the length direction of turn -up long jacket, two parallel to the width direction of turn -up wide jacket and the arc -shaped jacket articulated between long jacket and wide jacket, the corner of arc -shaped jacket and turn -up size matches, and the end between the head and tail of sealing jacket is provided with locking piece.

[0010] By adopting the above technical scheme, the installer will align the turn-ups of the high-temperature section air preheater and the low-temperature section air preheater, then sequentially sleeve the long jacket, the arc-shaped jacket, and the wide jacket on the sealing jacket to the two turn-ups, and then lock the head and tail ends of the sealing jacket with the locking piece, thereby improving the reliability of the combined air preheater connection, improving the stability of the combined air preheater during use, and preventing heat leakage. Compared with using multiple connecting pieces to connect the high-temperature section air preheater and the low-temperature section air preheater, the installation efficiency of this combined air preheater is higher.

[0011] Optionally, a sealing strip is arranged on the inner wall of the sealing jacket, and the sealing strip abuts against the side walls on the same side of the two turn-ups and covers the gap between the two turn-ups.

[0012] By adopting the above technical scheme, the sealing strip further enhances the sealing between the high-temperature section air preheater and the low-temperature section air preheater, thereby improving the heat exchange efficiency of the combined air preheater.

[0013] Optionally, a ring-shaped insertion groove is formed in the bottom wall of the high-temperature section air preheater, and an insertion ring plate is inserted into the insertion groove, and the insertion ring plate is arranged on the top wall of the low-temperature section air preheater.

[0014] By adopting the above technical scheme, the insertion and cooperation between the insertion ring strip and the insertion groove enable the high-temperature section air preheater and the low-temperature section air preheater to be initially docked, which facilitates the alignment of the turn-ups to be sealed and clamped, thereby improving the installation efficiency of the installer in sealing and fixing the high-temperature section air preheater and the low-temperature section air preheater.

[0015] Optionally, a sealing gasket is arranged on the inner bottom wall of the insertion groove.

[0016] By adopting the above technical scheme, the sealing gasket further improves the sealing degree when connecting the high-temperature section air preheater and the low-temperature section air preheater.

[0017] Optionally, a cover plate is hinged to the side wall of the low-temperature section air preheater, a placement groove is formed in the side wall of the low-temperature section air preheater towards the cover plate, and a heat preservation piece with a size adapted to the placement groove is inserted into the placement groove.

[0018] By adopting the technical scheme, the heat preservation piece can preserve the heat of the flue gas in the low-temperature section air preheater, reduce the possibility of heat loss, improve the heat exchange efficiency of the combined air preheater, and reduce the possibility of low-temperature corrosion of the heating surface in the low-temperature section air preheater.

[0019] Optionally, the side of the cover plate away from the hinge is provided with a positioning block facing the low-temperature section air preheater, a groove is formed in the side wall of the low-temperature section air preheater corresponding to the positioning block, and an elastic clamping piece for clamping the positioning block is arranged in the groove.

[0020] By adopting the technical scheme, the positioning block is clamped and fixed by the elastic clamping piece, which can prevent the cover plate from shaking during the operation of the combined device, and make the heat preservation piece adhere to the side wall of the low-temperature section air preheater, thereby improving the heat preservation effect of the heat preservation piece on the low-temperature section air preheater and reducing heat loss.

[0021] Optionally, a handle is arranged on the cover plate.

[0022] By adopting the technical scheme, the handle is arranged to facilitate the staff to turn over the cover plate, so that the cover plate can be easily taken when being installed or disassembled.

[0023] Optionally, heat transfer pipes are sleeved on the smoke inlet pipe at the top of the high-temperature section air preheater and the smoke outlet pipe of the low-temperature section air preheater, a cavity is formed in each heat transfer pipe, a ventilation mesh hole is formed in the side wall of each heat transfer pipe and communicates with the cavity, a ventilation pipe is arranged between the two heat transfer pipes and communicates with the ventilation mesh hole, and an exhaust fan is arranged in the ventilation pipe.

[0024] By adopting the technical scheme, the heat transfer pipes and the exhaust fan are arranged, so that the high heat on the wall of the smoke inlet pipe is transferred to the smoke outlet pipe through the heat transfer between the pipe walls and the air flowing in the heat transfer pipes, the temperature of the smoke outlet pipe of the low-temperature section air preheater is improved, the heat loss at the smoke inlet pipe is reduced, the flue gas heat resources are reasonably utilized, and the possibility of low-temperature corrosion is reduced.

[0025] In summary, the present application has at least one of the following beneficial technical effects:

[0026] 1. The installation personnel first align the flanges of the high-temperature section air preheater and the low-temperature section air preheater, then sequentially sleeve the long clamping sleeve, the arc-shaped clamping sleeve, and the wide clamping sleeve on the sealing clamping sleeve and the two flanges, and then lock the first end and the last end of the sealing clamping sleeve by using the locking piece, so as to improve the reliability of the combined air preheater connection, improve the stability of the combined air preheater during use, and prevent heat leakage. Compared with using multiple connecting pieces to connect the high-temperature section air preheater and the low-temperature section air preheater, the installation efficiency of this combined air preheater is higher.

[0027] 2. The sealing strip further enhances the sealing between the high-temperature section air preheater and the low-temperature section air preheater, thereby improving the heat exchange efficiency of the combined air preheater;

[0028] 3. The plug-in cooperation between the plug-in ring strip and the plug-in ring groove allows the high-temperature section air preheater and the low-temperature section air preheater to be initially docked, facilitating the alignment of the flange to be sealed and clamped, thereby improving the installation efficiency of the installer in sealing and fixing the high-temperature section air preheater and the low-temperature section air preheater. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0030] Figure 2 is an exploded view of the embodiment of the present application, which embodies the plug-in installation of the high-temperature section air preheater and the low-temperature section air preheater.

[0031] Figure 3 is Figure 2 is an enlarged view of position A in

[0032] Figure 4 is a schematic diagram of the embodiment of the present application, which embodies the sealing jacket.

[0033] Figure 5 is Figure 2 is an enlarged view of position B in

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1. High-temperature section air preheater; 11. Inlet flue gas pipe; 12. Plug-in ring groove; 2. Low-temperature section air preheater; 21. Outlet flue gas pipe; 22. Plug-in ring plate; 221. Sealing gasket; 23. Groove; 3. Flange; 4. Sealing jacket; 41. Long jacket; 42. Wide jacket; 43. Arc-shaped jacket; 44. Sealing strip; 45. Locking member; 451. Latch; 452. Hook; 5. Heat transfer assembly; 51. Heat transfer pipe; 512. Ventilation mesh; 52. Ventilation pipe; 53. Exhaust fan; 6. Heat preservation device; 61. Cover plate; 611. Handle; 612. Placement groove; 62. Heat preservation member; 7. Positioning block; 8. Elastic clamping member. DETAILED DESCRIPTION

[0036] The following will be described in detail in combination with the accompanying Figures 1-5 The present application will be further described in detail.

[0037] The embodiment of the present application discloses a combined air preheater.

[0038] Reference will be made to Figure 1 and Figure 2The utility model provides a combined air preheater, which comprises a high-temperature section air preheater 1 and a low-temperature section air preheater 2, the high-temperature section air preheater 1 is located above the low-temperature section air preheater 2, flanges 3 are integrally formed on the outer circumferential sidewalls of the connection parts of the high-temperature section air preheater 1 and the low-temperature section air preheater 2, a sealing jacket 4 is sleeved on the two flanges 3, a heat transfer assembly 5 is arranged between the smoke inlet pipe 11 of the high-temperature section air preheater 1 and the smoke outlet pipe 21 of the low-temperature section air preheater 2, and a heat preservation device 6 is arranged on the low-temperature section air preheater 2.

[0039] With reference to Figure 1 and Figure 2 , the installer aligns the flanges 3 of the high-temperature section air preheater 1 and the low-temperature section air preheater 2, and then clamps the two flanges 3 by using the sealing jacket 4 to improve the stability of the connection sealing between the high-temperature section air preheater 1 and the low-temperature section air preheater 2. During use of the combined device, the heat preservation device 6 reduces the possibility of heat loss of the low-temperature section air preheater 2, and the heat transfer assembly 5 transfers heat at the low-temperature section air preheater 2 and the smoke outlet pipe 21 thereof to reduce the possibility of low-temperature corrosion.

[0040] With reference to Figure 2 and Figure 3 , in order to improve the work efficiency of aligning the flanges 3 of the high-temperature section air preheater 1 and the low-temperature section air preheater 2, a ring-shaped insertion groove 12 is formed in the bottom wall of the high-temperature section air preheater 1, a ring-shaped insertion plate 22 is fixedly arranged on the top wall of the low-temperature section air preheater 2 and corresponds to the insertion groove 12, a sealing gasket 221 is fixedly arranged on the top of the insertion plate 22, and the insertion plate 22 is insertedly matched with the insertion groove 12.

[0041] With reference to Figure 4 , the sealing jacket 4 comprises two long clamps 41, two wide clamps 42 and four arc-shaped clamps 43, the long clamps 41, the arc-shaped clamps 43, the wide clamps 42 and the arc-shaped clamps 43 match the size of the outer circumferences of the flanges 3, are sequentially hinged together by hinge rods, and sealing strips 44 are fixedly arranged on the inner walls of the sealing jacket 4. When the sealing jacket 4 is sleeved on the two flanges 3, the sealing strips 44 abut against the sidewalls on the same side of the two flanges 3 and cover the gap between the two flanges 3. Locking members 45 are arranged between the front end and the tail end of the sealing jacket 4. In the embodiment, the locking members 45 are buckles, the buckle comprises a clasp 451 and a hook 452, the clasp 451 is fixedly arranged on the arc-shaped clamp 43, the hook 452 is fixedly arranged on the long clamp 41, and the hook 452 is tightly buckled on the clasp 451.

[0042] With reference to Figure 1 , Figure 2 and Figure 5The heat preservation device 6 is provided on the side wall of the low-temperature section air preheater 2, each heat preservation device 6 comprises a cover plate 61 and a heat preservation piece 62, the top side wall of the cover plate 61 is hinged to the side wall of the low-temperature section air preheater 2, a handle 611 is fixedly arranged on the side wall of the cover plate 61 away from the low-temperature section air preheater 2, and a placing groove 612 is formed in the side wall of the cover plate 61 towards the low-temperature section air preheater 2, and the heat preservation piece 62 in the embodiment is a rock wool board which is matched in size with the placing groove 612 and is inserted into the placing groove 612.

[0043] With reference to Figure 5 A positioning block 7 is fixedly arranged on the side wall of the cover plate 61 away from the hinged side towards the low-temperature section air preheater 2, and the end of the positioning block 7 towards the low-temperature section air preheater 2 is provided in a spherical shape, and a groove 23 is formed in the side wall of the low-temperature section air preheater 2 corresponding to the positioning block 7, and an elastic clamping piece 8 is arranged in the groove 23, and the elastic clamping piece 8 in the embodiment is two arc-shaped elastic sheets fixedly arranged on the opposite side walls in the groove 23, and the centers of curvature of the two arc-shaped elastic sheets are located on the opposite sides of the two arc-shaped elastic sheets.

[0044] With reference to Figure 5 When the rock wool board is placed in the placing groove 612 by the operator, the cover plate 61 is turned over through the handle 611 to make the spherical top of the positioning block 7 extruded into the groove 23 from the opposite sides of the two arc-shaped elastic sheets and be limited in the groove 23 by the two arc-shaped elastic sheets, so that the rock wool board is attached to the side wall of the low-temperature section air preheater 2.

[0045] With reference to Figure 1 The heat transfer assembly 5 comprises heat transfer pipes 51, a ventilation pipe 52 and an exhaust fan 53, one heat transfer pipe 51 is installed and sleeved on the inlet flue 11 at the top of the high-temperature section air preheater 1 and the outlet flue 21 of the low-temperature section air preheater 2, a cavity is formed in the inside of each heat transfer pipe 51, and ventilation mesh holes 512 are formed in the side wall of each heat transfer pipe 51 and communicated with the cavity. The ventilation pipe 52 is a multi-section pipe and can be adjusted in length according to requirements, the ventilation pipe 52 is communicated with the two heat transfer pipes 51, and the exhaust fan 53 is fixedly and serially arranged in one section of the ventilation pipe 52, the air inlet of the exhaust fan 53 is towards the heat transfer pipe 51 at the inlet flue 11, and the air outlet is towards the heat transfer pipe 51 at the outlet flue 21.

[0046] The implementation principle of the combined air preheater in the embodiment is that the installer arranges the flanges 3 of the high-temperature section air preheater 1 and the low-temperature section air preheater 2, the sealing clamping sleeve 4 is used to clamp the two flanges 3 to improve the sealing performance of the connection between the high-temperature section air preheater 1 and the low-temperature section air preheater 2, and the sealing clamping sleeve 4 is locked by the snap fastener.

[0047] The combination device, before use, places the rock wool board in the placing groove 612, then turns the handle 611 to overturn the cover plate 61, so that the spherical top of the positioning block 7 is extruded into the groove 23 from the opposite sides of the two arc-shaped elastic sheets, and is limited in the groove 23 by the two arc-shaped elastic sheets, so that the rock wool board is attached to the sidewall of the low-temperature section air preheater 2, and the low-temperature section air preheater 2 is provided with the heat preservation effect.

[0048] Meanwhile, the exhaust fan 53 is started, and when the combination device is used, the high heat at the wall of the smoke inlet pipe 11 is transmitted to the air flowing in the heat transfer pipe 51 through the heat transfer between the pipe walls, and is sent to the smoke outlet pipe 21, so as to increase the temperature at the smoke outlet pipe 21 of the low-temperature section air preheater 2.

[0049] The above are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore, equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A combined air preheater, comprising a high-temperature section air preheater (1) and a low-temperature section air preheater (2) located below the high-temperature section air preheater (1), characterized in that, The outer peripheral sidewalls of the connection between the high-temperature section air preheater (1) and the low-temperature section air preheater (2) are provided with flanges (3). A sealing sleeve (4) is fitted on both the upper and lower flanges (3). The sealing sleeve (4) includes two long sleeves (41) parallel to the length direction of the flanges (3), two wide sleeves (42) parallel to the width direction of the flanges (3), and an arc-shaped sleeve (43) hinged between the long sleeves (41) and the wide sleeves (42). The arc-shaped sleeve (43) matches the corner size of the flanges (3). A locking member (45) is provided between the ends of the sealing sleeve (4) that are connected end to end.

2. A combined air preheater according to claim 1, characterized in that, A sealing strip (44) is provided on the inner wall of the sealing jacket (4). The sealing strip (44) abuts against the side wall on the same side of the two flanges (3) and covers the gap between the two flanges (3).

3. A combined air preheater according to claim 1, characterized in that, A ring groove (12) is formed on the bottom wall of the high-temperature air preheater (1), and a ring plate (22) is inserted into the ring groove (12). The ring plate (22) is set on the top wall of the low-temperature air preheater (2).

4. A combined air preheater according to claim 3, characterized in that, A sealing gasket (221) is provided on the top of the plug ring plate (22).

5. A combined air preheater according to claim 1, characterized in that, A cover plate (61) is hinged to the side wall of the low-temperature air preheater (2). The cover plate (61) has a placement groove (612) facing the side wall of the low-temperature air preheater (2), and a heat insulation component (62) of suitable size is inserted into the placement groove (612).

6. A combined air preheater according to claim 5, characterized in that, The cover plate (61) is provided with a positioning block (7) on the side away from the hinge and facing the low temperature section air preheater (2). A groove (23) is provided on the side wall of the low temperature section air preheater (2) corresponding to the positioning block (7), and an elastic clamping member (8) for clamping the positioning block (7) is provided in the groove (23).

7. A combined air preheater according to claim 5, characterized in that, A handle (611) is provided on the cover plate (61).

8. A combined air preheater according to claim 1, characterized in that, Heat transfer tubes (51) are fitted on the flue gas inlet pipe (11) at the top of the high-temperature section air preheater (1) and the flue gas outlet pipe (21) of the low-temperature section air preheater (2). Each heat transfer tube (51) has a cavity inside, and ventilation mesh (512) is also provided on the side wall of each heat transfer tube (51) in connection with the cavity. A ventilation pipe (52) is connected between two heat transfer tubes (51), and an exhaust fan (53) is connected in the ventilation pipe (52).

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