Air preheater

Abstract

The utility model discloses an air preheater which comprises a shell, the shell is divided into an inner shell and an outer shell, a supporting plate is arranged between the inner shell and the outer shell, filler is arranged between the inner shell and the outer shell, a smoke inlet is formed in the upper side of the shell, a smoke outlet is formed in the lower side of the shell, and an air heat exchange device is arranged in the shell. A positioning groove matched with the air heat exchange device is formed in one side of the inner shell, a sealing cover plate is arranged on the shell on the other side of the inner shell, and a limiting groove is formed in the sealing cover plate. The beneficial effects are that the supporting plate is arranged, so that the use strength of the shell is improved; the limiting grooves and the positioning grooves are formed, so that the air heat exchange device can be quickly and effectively mounted and positioned; and by arranging the sealing cover plate, the sealing cover plate is convenient to disassemble and assemble, and the internal air heat exchange device is convenient to maintain and replace.

Description

Technical Field

[0001] The utility model relates to the technical field of preheating devices, in particular to an air preheater. Background Art

[0002] When the high-speed burner used in the bell-type furnace is burning, the excess air is mixed with the gas through the air and gas ratio adjustment system. Generally, the oxygen content (volume fraction) in the mixed gas is controlled at 3%-5% to achieve complete combustion. The higher the temperature of the air fed in, the better the combustion efficiency of the gas and the combustion intensity of the burner, and the safer the gas combustion. At present, the air heating method of the bell-type furnace mostly uses the high-temperature flue gas generated by the bell-type furnace during the heating process to heat through heat transfer. This heating method is in line with the industrial policy of building a conservation-oriented society advocated by the country, and at the same time avoids a large amount of high-temperature flue gas in the bell-type furnace being directly discharged into the air, causing greenhouse effect and polluting the environment. Its function is to transfer the heat carried by the flue gas discharged from the flue to the air before entering the boiler through the heat sink, and preheat the air to a certain temperature.

[0003] However, in the process of implementing the utility model technical solution in the embodiment of the present application, the applicant found that the above technology has at least the following technical problems:

[0004] The air preheater needs to keep the internal temperature warm during operation. The outer shell generally adopts a double-layer structure, which is prone to deformation during use. The outer shell strength needs to be improved. During long-term operation, the internal heat exchange device will malfunction and need to be repaired or maintained. Disassembly and assembly are cumbersome and not conducive to quick installation or maintenance. Utility Model Content

[0005] The embodiment of the present application provides an air preheater and sets a support plate to improve the use strength of the shell; by setting a limit groove and a positioning groove, the air heat exchange device can be installed and positioned quickly and effectively; by setting a sealing cover plate, the sealing cover plate is easy to disassemble and assemble, and the internal air heat exchange device is convenient for maintenance and replacement.

[0006] An embodiment of the present application provides an air preheater, comprising: a shell, wherein the shell is divided into an inner shell and an outer shell, a support plate is arranged between the inner shell and the outer shell, a filler is arranged between the inner shell and the outer shell, a smoke inlet is arranged on the upper side of the shell, a smoke outlet is arranged on the lower side, an air heat exchange device is arranged inside, a positioning groove matching with the air heat exchange device is arranged on one side of the inner shell, a sealing cover plate is arranged on the other side of the shell, a limiting groove is arranged on the sealing cover plate, the air heat exchange device comprises a left tube sheet and a right tube sheet, a plurality of heat exchange tubes are connected between the left tube sheet and the right tube sheet, an air inlet and an air outlet are arranged on the right tube sheet, the air inlet is located on the lower side of the air outlet, and the heat exchange tubes are sealedly connected to the left tube sheet and the right tube sheet.

[0007] Furthermore, a filter device is provided in the air inlet, and the filter device is connected and fixed to the air inlet by means of threads.

[0008] Furthermore, the support plates are connected and fixed to the inner shell and the outer shell by welding, triangular welding blocks are provided at the connection of the support plates, and the number of the support plates is several.

[0009] Furthermore, the distances between the inner shell and the outer shell are the same, and the filler is any one of ceramic fiber and silicate fiber.

[0010] Furthermore, the positioning groove is fitted with one side of the air heat exchange device, and the limiting groove is fitted with the other side of the air heat exchange device. The positioning groove and the limiting groove are symmetrical to each other in horizontal position, and the depth of the positioning groove and the limiting groove is 1 / 6 of the thickness of the left tube sheet and the right tube sheet.

[0011] Furthermore, the left tube sheet and the right tube sheet have the same size and thickness, and are hollow inside. A partition is provided between the air inlet and the air outlet on the right tube sheet, and the partition is connected and fixed by welding.

[0012] Furthermore, flanges are provided on the air inlet and the air outlet, the diameter of the air inlet is 1 / 2 of the diameter of the air outlet, and the size of the smoke inlet is 4 times the size of the smoke outlet.

[0013] Furthermore, the internal structure of the sealing cover plate is the same as the shell structure, the sealing cover plate is arranged in the shell by embedding, the outer side of the sealing cover plate is a connecting plate, the outer circle of the connecting plate is evenly distributed with bolt holes, a fixing plate matching the connecting plate is welded on the shell, and the fixing plate and the connecting plate are connected by bolts.

[0014] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0015] By providing fillers, the internal temperature can be effectively maintained and prevented from dissipating; by providing support plates, the use strength of the shell is improved; by providing limit grooves and positioning grooves, the air heat exchange device can be installed and positioned quickly and effectively; by providing a sealing cover plate, the sealing cover plate is easy to disassemble and assemble, making it convenient to repair and replace the internal air heat exchange device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the specific structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the specific structure of the air heat exchange device in the utility model;

[0018] Figure 3 for Figure 1 The enlarged view of point A in the middle;

[0019] Figure 4 for Figure 1 Enlarged view of point B in the middle. DETAILED DESCRIPTION

[0020] The embodiment of the present application provides an air preheater and sets a support plate to improve the use strength of the shell; by setting a limit groove and a positioning groove, the air heat exchange device can be installed and positioned quickly and effectively; by setting a sealing cover plate, the sealing cover plate is easy to disassemble and assemble, and the internal air heat exchange device is convenient for maintenance and replacement.

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Embodiment 1

[0022] An air preheater comprises: a shell, wherein the shell is divided into an inner shell 12 and an outer shell 11, a support plate 13 is arranged between the inner shell 12 and the outer shell 11, a filler 14 is arranged between the inner shell 12 and the outer shell 11, a smoke inlet 1 is arranged on the upper side of the shell, a smoke outlet 7 is arranged on the lower side, an air heat exchange device 3 is arranged inside, a positioning groove matched with the air heat exchange device 3 is arranged on one side of the inner shell 12, a sealing cover plate 6 is arranged on the shell on the other side, and a limiting groove is arranged on the sealing cover plate 6, the air heat exchange device 3 comprises a left tube sheet 8 and a right tube sheet 10, a plurality of heat exchange tubes 9 are connected between the left tube sheet 8 and the right tube sheet, an air inlet 4 and an air outlet 2 are arranged on the right tube sheet 10, the air inlet 4 is located at the lower side of the air outlet 2, and the heat exchange tube 9 is sealedly connected to the left tube sheet 8 and the right tube sheet 10.

[0023] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0024] By setting the filler 14, the internal temperature can be effectively maintained to prevent the internal temperature from dissipating; by setting the support plate 13, the use strength of the shell is improved; by setting the limit groove and the positioning groove, the air heat exchange device 3 can be installed and positioned quickly and effectively; by setting the sealing cover plate 6, the sealing cover plate 6 is easy to disassemble and assemble, and the internal air heat exchange device 3 is convenient for maintenance and replacement. Embodiment 2

[0025] An air preheater, wherein a filter device 5 is provided in the air inlet 4, and the filter device 5 is connected and fixed to the air inlet 4 by means of threads;

[0026] The support plate 13 is connected and fixed to the inner shell 12 and the outer shell 11 by welding. A triangular welding block 13-1 is provided at the connection of the support plate 13. The number of the support plates 13 is several. The spacing between the inner shell 12 and the outer shell 11 is the same. The filler 14 is selected from any one of ceramic fiber or silicate fiber.

[0027] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0028] The filter device 5 can filter the incoming air to prevent debris from entering the interior and clogging the heat exchange tube 9. The filter device 5 is fixed by threads, which is easy to disassemble and replace;

[0029] The support plate 13 supports the inner shell 12 and the outer shell 11 to a certain extent. The support plate 13 can maintain the distance between the inner shell 12 and the outer shell 11 , protect the filler 14 , and enhance the use strength of the outer shell 11 to a certain extent. Embodiment 3

[0030] An air preheater, wherein the positioning groove is fitted with one side of the air heat exchange device 3, and the limiting groove is fitted with the other side of the air heat exchange device 3. The positioning groove and the limiting groove are symmetrical to each other in horizontal position, and the depth of the positioning groove and the limiting groove is 1 / 6 of the thickness of the left tube sheet 8 and the right tube sheet 10.

[0031] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0032] The air heat exchange device 3 can be quickly positioned and installed through the positioning groove, and the air heat exchange device 3 can be limited and installed through the limiting groove. The positioning groove and the limiting groove play a certain supporting, positioning, fixing and limiting role. Embodiment 4

[0033] An air preheater, wherein the left tube sheet 8 and the right tube sheet 10 have the same size and thickness, are hollow inside, and a partition is provided between the air inlet 4 and the air outlet 2 on the right tube sheet 10, and the partition is connected and fixed by welding;

[0034] Flanges are provided on the air inlet 4 and the air outlet 2 . The diameter of the air inlet 4 is 1 / 2 of the diameter of the air outlet 2 . The size of the smoke inlet 1 is 4 times the size of the smoke outlet 7 .

[0035] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0036] The air inlet 4 is smaller than the air outlet 2, so the incoming air can stay in the air heat exchange device 3 longer, thereby absorbing more heat; the smoke inlet 1 is larger than the smoke outlet 7, which can increase the flow rate and flow of the smoke, achieve better heat exchange effect, reduce the residence time of the smoke, and prevent condensation of water vapor in the smoke. Embodiment 5

[0037] An air preheater, wherein the internal structure of the sealing cover plate 6 is the same as the shell structure, the sealing cover plate 6 is arranged in the shell by embedding, the outer side of the sealing cover plate 6 is a connecting plate 6-1, the outer circle of the connecting plate 6-1 is evenly distributed with bolt holes, a fixing plate 6-2 matching with the connecting plate 6-1 is welded on the shell, and the fixing plate 6-2 and the connecting plate 6-1 are connected by bolts.

[0038] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0039] The sealing cover plate 6 is easy to disassemble and assemble, and the air preheating device can be quickly and conveniently disassembled, assembled or maintained by disassembling and assembling the sealing cover plate 6.

[0040] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0041] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An air preheater, comprising: A shell, characterized in that the shell is divided into an inner shell and an outer shell, a support plate is arranged between the inner shell and the outer shell, a filler is arranged between the inner shell and the outer shell, a smoke inlet is arranged on the upper side of the shell, a smoke outlet is arranged on the lower side, an air heat exchange device is arranged inside, a positioning groove matched with the air heat exchange device is arranged on one side of the inner shell, a sealing cover plate is arranged on the shell on the other side, a limiting groove is arranged on the sealing cover plate, the air heat exchange device comprises a left tube sheet and a right tube sheet, a plurality of heat exchange tubes are connected between the left tube sheet and the right tube sheet, an air inlet and an air outlet are arranged on the right tube sheet, the air inlet is located on the lower side of the air outlet, and the heat exchange tubes are sealed to the left tube sheet and the right tube sheet.

2. An air preheater according to claim 1, characterized in that: A filter device is arranged in the air inlet, and the filter device is connected and fixed to the air inlet by means of threads.

3. An air preheater according to claim 1, characterized in that: The support plates are connected and fixed to the inner shell and the outer shell by welding, and triangular welding blocks are arranged at the connection of the support plates. The number of the support plates is several.

4. An air preheater according to claim 1, characterized in that: The distances between the inner shell and the outer shell are the same, and the filler is selected from any one of ceramic fiber and silicate fiber.

5. An air preheater according to claim 1, characterized in that: The positioning groove is fitted with one side of the air heat exchange device, and the limiting groove is fitted with the other side of the air heat exchange device. The positioning groove and the limiting groove are symmetrical to each other in the horizontal position, and the depth of the positioning groove and the limiting groove is 1 / 6 of the thickness of the left tube sheet and the right tube sheet.

6. An air preheater according to claim 1, characterized in that: The left tube sheet and the right tube sheet have the same size and thickness and are hollow inside. A partition is provided between the air inlet and the air outlet on the right tube sheet, and the partition is connected and fixed by welding.

7. An air preheater according to claim 1, characterized in that: Flanges are provided on the air inlet and the air outlet. The diameter of the air inlet is 1 / 2 of the diameter of the air outlet. The size of the smoke inlet is 4 times the size of the smoke outlet.

8. An air preheater according to claim 1, characterized in that: The internal structure of the sealing cover plate is the same as the shell structure. The sealing cover plate is arranged in the shell by embedding. The outer side of the sealing cover plate is a connecting plate. The outer circle of the connecting plate is evenly distributed with bolt holes. A fixing plate matching the connecting plate is welded on the shell, and the fixing plate and the connecting plate are connected by bolts.

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