Air preheater

Abstract

The utility model relates to the field of heat exchangers, in particular to an air preheater which comprises a preheater body, a flue gas inlet cone, a flue gas outlet cone, an air inlet cone and an air outlet cone are arranged on the preheater body, and a mounting frame is detachably mounted between the flue gas inlet cone and the preheater body through a mounting mechanism. And a filter screen is mounted in the mounting frame. Flue gas is filtered through the filter screen before entering the preheater body, solid particles in the flue gas are screened out, the possibility that the solid particles are attached to a pipeline in the preheater body is reduced, the heat exchange efficiency between the flue gas and air is improved, the preheating effect of the air is enhanced, and after the filtering effect of an old filter screen is reduced, the heat exchange efficiency between the flue gas and the air is improved. A new filter screen is mounted through the mounting mechanism, so that the filtering effect of the filter screen is effectively maintained.

Description

Technical Field

[0001] The present application relates to the field of heat exchangers, and in particular to an air preheater. Background Art

[0002] During the process of burning fuel, thermal power plants need to continuously introduce air into the boiler to ensure that there is enough oxygen in the boiler for the dye to burn fully. Before the air is introduced into the boiler, it is often necessary to preheat the air to improve the combustion efficiency in the boiler.

[0003] Traditional air preheaters are usually tube-type and fin-tube-type. The flue gas is blown to the outer surface of the air duct in the air preheater, thereby transferring the heat in the flue gas to the air in the duct to achieve air preheating.

[0004] In the actual preheating process, the flue gas contains a large amount of solid particles. The flue gas is blown toward the pipe in a direction perpendicular to the pipe, which makes the side of the pipe facing the flue gas prone to dust accumulation, thereby reducing the heat exchange efficiency between the flue gas and the air and weakening the air preheating effect. Utility Model Content

[0005] In order to improve the problem of low heat exchange efficiency in the preheater, the present application provides an air preheater. The air preheater provided in the present application adopts the following technical solution:

[0006] An air preheater comprises a preheater body, on which a smoke inlet cone, a smoke outlet cone, an air inlet cone and an air outlet cone are arranged, a mounting frame is detachably mounted between the smoke inlet cone and the preheater body via a mounting mechanism, and a filter is mounted in the mounting frame.

[0007] By adopting the above technical solution, the flue gas is filtered through the filter before entering the preheater body, and the solid particles in the flue gas are screened out, thereby reducing the possibility of solid particles adhering to the pipes in the preheater body, improving the heat exchange efficiency between the flue gas and the air, and enhancing the air preheating effect. After the filtering effect of the old filter is reduced, the new filter is replaced by the installation mechanism, which effectively maintains the filtering effect of the filter.

[0008] Optionally, the mounting mechanism includes a slide rail installed between the flue gas inlet cone and the preheater body, the slide rail is located below the flue gas flow, the top wall of the slide rail is provided with a slide groove along the length direction of the slide rail, the mounting frame is slidably installed in the slide groove, the sliding direction of the mounting frame is perpendicular to the direction of the flue gas flow, and two surfaces of the mounting frame distributed along the thickness direction are respectively fitted with the flue gas inlet cone and the preheater body, and a positioning piece for fixing the position of the mounting frame is provided on the slide rail.

[0009] By adopting the above technical solution, the installation frame together with the filter is removed by sliding. Since the sliding disassembly and assembly method has lower requirements on the gap, the sliding disassembly and assembly method is more suitable for disassembling and assembling the installation frame between the flue gas inlet cone and the preheater body.

[0010] Optionally, the positioning member includes a fixed block, a positioning block and a spring, the fixed block protruding from the bottom wall of the sliding groove, a vertical mounting groove is opened on the bottom wall of the sliding groove at one end away from the fixed block, the spring is placed in the mounting groove, the positioning block is vertically slidably installed in the mounting groove, the bottom end of the positioning block is connected to the spring, and the side walls at both ends of the mounting frame distributed along the length direction of the slide rail are respectively fitted with the fixed block and the positioning block.

[0011] By adopting the above technical solution, during the sliding process of the installation frame, the bottom wall of the installation frame presses the positioning block as a whole into the installation groove. After the installation frame slides along the length direction of the slide rail until it contacts the fixed block, the top of the positioning block protrudes from the bottom wall of the slide groove under the action of the spring and fits with the side wall of the installation frame away from the fixed block, thereby completing the positioning of the installation frame on the slide rail. After sliding to the specified position, the installation frame is automatically positioned and fixed, making the installation of the installation frame more convenient.

[0012] Optionally, a long groove with a vertical length direction is opened on the side wall of the slide rail, the long groove is connected with the installation groove, and the long groove is located below the installation frame. A pressure rod is provided on the side wall of the positioning block, and one end of the pressure rod away from the positioning block passes through the long groove and is located outside the slide rail.

[0013] By adopting the above technical solution, when the installation frame is placed on the slide rail, the positioning block is pressed into the installation groove by the pressure rod, so that when the end of the installation frame close to the fixed block slides through the installation groove, the positioning block is not easy to form an obstacle to the installation frame, and when the positioning block bounces upward, the top wall of the long groove limits the pressure rod, thereby preventing the positioning block from flying out of the installation groove.

[0014] Optionally, the pressure rod is threadedly connected to the positioning block.

[0015] By adopting the above technical solution, the pressure rod will bend after being used for a period of time due to the collision between the pressure rod and the top wall of the long groove. The pressure rod is connected to the positioning block by threads to facilitate replacement of the pressure rod.

[0016] Optionally, a connecting plate parallel to the slide rail is installed on the preheater body above the slide rail, and the side of the connecting plate away from the preheater body is connected to the flue gas inlet cone. A slide groove is provided at the bottom of the connecting plate, and the top of the installation frame slides in cooperation with the slide groove.

[0017] By adopting the above technical solution, the top of the installation frame is slidably installed in the slide groove, and the connecting plate limits the height of the installation frame, making the installation frame more stable during the sliding process, and also improving the stability of the installation frame after installation.

[0018] Optionally, sealing rings for preventing smoke leakage are provided on two surfaces of the installation frame distributed along the thickness direction.

[0019] By adopting the above technical solution, the two sealing rings are respectively in contact with the flue gas inlet cone and the surface of the preheater body, thereby reducing the possibility of flue gas leaking from the gap when passing through the filter.

[0020] Optionally, a handle is provided on an edge of the vertical frame of the installation frame.

[0021] By adopting the above technical solution, when replacing the filter screen, the operator can hold the handle to push, pull and slide the installation frame, which effectively improves the efficiency of disassembling and assembling the installation frame.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. Before the flue gas enters the preheater body, the solid particles are screened out at the filter, and the filter is disassembled by sliding, so that the preheater body maintains a high efficiency in preheating the air;

[0024] 2. The positioning block cooperates with the spring to limit one side of the installation frame, and the spring is initially compressed by the pressure rod, which effectively improves the disassembly and assembly efficiency of the installation frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural schematic diagram of this application.

[0026] Figure 2 It is an exploded view of the three-dimensional structure of the installation frame of the present application.

[0027] Figure 3 It is a top view of the slide rail of the present application.

[0028] Figure 4 It is a three-dimensional structural cross-sectional view of the slide rail of the present application.

[0029] Figure numerals: 1. preheater body; 11. flue gas inlet cone; 12. flue gas outlet cone; 13. air inlet cone; 14. air outlet cone; 2. mounting frame; 3. filter screen; 4. mounting mechanism; 41. first sliding bar; 42. second sliding bar; 43. slide rail; 44. sliding groove; 45. connecting plate; 46. slide groove; 5. positioning member; 51. fixing block; 52. positioning block; 53. spring; 54. mounting groove; 55. long groove; 56. pressure rod; 6. sealing ring; 7. handle. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The present application embodiment discloses an air preheater, referring to Figure 1 The preheater body 1 comprises a flue gas inlet cone 11, a flue gas outlet cone 12, an air inlet cone 13 and an air outlet cone 14. The preheater body 1 is in a cubic shape. The flue gas inlet cone 11, the flue gas outlet cone 12, the air inlet cone 13 and the air outlet cone 14 have the same structural shape, which is a conical bucket structure with a quadrilateral at one end and a gradually transitioned circular conical bucket structure at the other end. The air inlet cone 13 and the air outlet cone 14 are respectively distributed in the preheater body 1 along the vertical direction. The upper and lower sides of the body 1, and one end of the air inlet cone 13 and the air outlet cone 14 in a quadrilateral form a docking with the preheater body 1 and are fixedly installed on the preheater body 1, the smoke outlet cone 12 and the smoke inlet cone 11 are respectively distributed on the left and right sides of the preheater body 1 in the horizontal direction, and one end of the smoke inlet cone 11 and the smoke outlet cone 12 in a quadrilateral form a docking with the preheater body 1, and the smoke outlet cone 12 is fixedly installed on the preheater body 1.

[0032] Reference Figure 2 A slide rail 43 and a connecting plate 45 are fixedly installed between the preheater body 1 and the flue gas inlet cone 11. The slide rail 43 and the connecting plate 45 are parallel to each other and the connecting plate 45 is located above the slide rail 43. The two vertical side surfaces of the slide rail 43 extending along the length direction are respectively fixedly connected to the preheater body 1 and the flue gas inlet cone 11. The length of the slide rail 43 is greater than the horizontal side length of one end of the quadrilateral of the flue gas inlet cone 11. The two vertical side surfaces of the connecting plate 45 extending along the length direction are also respectively fixedly connected to the preheater body 1 and the flue gas inlet cone 11. A sliding groove 44 extending along the length direction of the slide rail 43 is provided at the top of the slide rail 43, and the sliding groove 44 penetrates both ends of the slide rail 43. A sliding groove 46 extending along the length direction of the connecting plate 45 is provided at the bottom of the connecting plate 45, and the sliding groove 46 penetrates both ends of the connecting plate 45.

[0033] Reference Figure 2 A mounting frame 2 is slidably installed between the slide rail 43 and the connecting plate 45, a filter screen 3 is fixedly installed in the mounting frame 2, the mounting frame 2 is rectangular and vertically arranged, a first sliding bar 41 parallel to the mounting frame 2 is protruding from the bottom of the mounting frame 2, a second sliding bar 42 parallel to the mounting frame 2 is protruding from the top of the mounting frame 2, the first sliding bar 41 is slidably installed in the sliding groove 44, the top of the second sliding bar 42 is slidably installed in the sliding groove 46, and a positioning member 5 for fixing the position of the mounting frame 2 is arranged in the sliding groove 44.

[0034] Reference Figure 2 and Figure 3 The positioning member 5 includes a fixed block 51 protruding from the bottom wall of one end of the sliding groove 44, the end wall of the first sliding bar 41 close to the fixed block 51 is in contact with the fixed block 51, and a positioning block 52 is provided at one end of the sliding groove 44 away from the fixed block 51, and the end wall of the first sliding bar 41 away from the fixed block 51 is in contact with the positioning block 52. Under the positioning of the positioning member 5, the side wall of the installation frame 2 close to the flue gas inlet cone 11 is in contact with the side wall of the quadrilateral end of the flue gas inlet cone 11, and the side wall of the installation frame 2 away from the flue gas inlet cone 11 is in contact with the side wall of the preheater body 1, and sealing rings 6 are fixedly installed on both side walls of the installation frame 2, and the two sealing rings 6 are respectively in contact with the flue gas inlet cone 11 and the preheater body 1, which effectively prevents the smoke from leaking from the gap.

[0035] Reference Figure 4 A vertical mounting groove 54 is provided on the bottom wall of the sliding groove 44, a vertical spring 53 is fixedly installed on the bottom wall of the mounting groove 54, the bottom of the positioning block 52 is fixedly connected to the top of the spring 53, the positioning block 52 is vertically slidably installed in the mounting groove 54, and the length of the positioning block 52 is less than the depth of the mounting groove 54. In the working state, the top of the positioning block 52 protrudes from the top of the mounting groove 54.

[0036] Reference Figure 4 A long groove 55 with a vertical length direction is provided on the side wall of the slide rail 43 near the positioning block 52, and the long groove 55 is connected with the mounting groove 54 along the depth direction, and the long groove 55 is located between the bottom wall of the sliding groove 44 and the bottom wall of the mounting groove 54 in terms of vertical height. A pressure rod 56 is threadedly connected to the side wall of the positioning block 52 near the long groove 55, and one end of the pressure rod 56 away from the positioning block 52 passes through the long groove 55 and is located outside the slide rail 43.

[0037] Reference Figure 2 A handle 7 is fixedly installed on the vertical side wall of the installation frame 2 near the positioning block 52. The operator can hold the handle 7 to facilitate the installation frame 2 to be disassembled and installed in a push-pull manner.

[0038] The implementation principle of an air preheater in the embodiment of the present application is as follows: when placing the installation frame 2, one end of the first sliding bar 41 is placed in the sliding groove 44, the operator holds the handle 7 with one hand to support and fix the installation frame 2, and the operator presses the pressure rod 56 downward with the other hand to make the positioning block 52 completely immersed in the installation groove 54, push the installation frame 2, and the second sliding bar 42 slides into the sliding groove 46, the bottom of the first sliding bar 41 covers the notch of the installation groove 54, release the hand pressing the pressure rod 56, and continue to push the installation frame 2, so that the end wall of the first sliding bar 41 fits with the fixing block 51, and the positioning block 52 bounces up and protrudes from the bottom wall of the sliding groove 44 under the action of the spring 53, and fits with the end wall of the first sliding bar 41 away from the fixing block 51, and the installation is completed; when disassembling the installation frame 2, the operator holds the handle 7 with one hand, and the operator presses the pressure rod 56 downward with the other hand, pulls the installation frame 2, and the first sliding bar 41 is separated from the slide rail 43, and the disassembly is completed.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An air preheater, characterized in that: The invention comprises a preheater body (1), wherein the preheater body (1) is provided with a smoke inlet cone (11), a smoke outlet cone (12), an air inlet cone (13) and an air outlet cone (14); a mounting frame (2) is detachably mounted between the smoke inlet cone (11) and the preheater body (1) via a mounting mechanism (4); a filter screen (3) is mounted in the mounting frame (2).

2. An air preheater according to claim 1, characterized in that: The mounting mechanism (4) comprises a slide rail (43) mounted between the flue gas inlet cone (11) and the preheater body (1), the slide rail (43) being located below the flow of flue gas, a slide groove (44) being provided on the top wall of the slide rail (43) along the length direction of the slide rail (43), the mounting frame (2) being slidably mounted in the slide groove (44), the slide direction of the mounting frame (2) being perpendicular to the flow direction of flue gas, and two surfaces of the mounting frame (2) distributed along the thickness direction being respectively fitted with the flue gas inlet cone (11) and the preheater body (1), and a positioning member (5) for fixing the position of the mounting frame (2) is provided on the slide rail (43).

3. An air preheater according to claim 2, characterized in that: The positioning member (5) comprises a fixed block (51), a positioning block (52) and a spring (53); the fixed block (51) is protrudingly arranged on the bottom wall of the sliding groove (44); a vertical mounting groove (54) is provided on the bottom wall of the sliding groove (44) at one end away from the fixed block (51); the spring (53) is placed in the mounting groove (54); the positioning block (52) is vertically slidably installed in the mounting groove (54); the bottom end of the positioning block (52) is connected to the spring (53); and the side walls at both ends of the mounting frame (2) distributed along the length direction of the sliding rail (43) are respectively fitted with the fixed block (51) and the positioning block (52).

4. An air preheater according to claim 3, characterized in that: A long groove (55) with a vertical length direction is provided on the side wall of the slide rail (43), the long groove (55) is connected to the installation groove (54), and the long groove (55) is located below the installation frame (2). A pressure rod (56) is provided on the side wall of the positioning block (52), and one end of the pressure rod (56) away from the positioning block (52) passes through the long groove (55) and is located outside the slide rail (43).

5. An air preheater according to claim 4, characterized in that: The pressure rod (56) is threadedly connected to the positioning block (52).

6. An air preheater according to claim 2, characterized in that: A connecting plate (45) parallel to the sliding rail (43) is installed on the preheater body (1) above the sliding rail (43); the connecting plate (45) is connected to the flue gas inlet cone (11) at a side away from the preheater body (1); a sliding groove (46) is provided at the bottom of the connecting plate (45); and the top of the mounting frame (2) is slidably engaged with the sliding groove (46).

7. An air preheater according to claim 2, characterized in that: Sealing rings (6) for preventing smoke leakage are provided on two surfaces of the installation frame (2) distributed in the thickness direction.

8. An air preheater according to claim 2, characterized in that: A handle (7) is provided on the vertical frame edge of the installation frame (2).

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