Heat exchange assembly of air pre-heater

Abstract

The utility model discloses a heat exchange assembly of an air pre-heater, which belongs to the technical field of heat exchange of air pre-heaters and comprises an outer frame, partition plates and heat exchange sheets, the outer frame is a three-dimensional frame, the partition plates are arranged on the side wall of the outer frame, a plurality of heat exchange sheets are stacked in the outer frame, and each heat exchange sheet is a large-channel corrugated plate. The rotary air pre-heater has the advantages that the heat exchange assemblies are arranged at the cold end of the rotary air pre-heater in a combined mode, along with operation of the air pre-heater, under the action of the corrugated plate heat exchange pieces with the large channels, the flue gas circulation cross section is large, the wave form is smooth, impurities such as ammonium bisulfate, dust and coal cinder are not prone to being attached and easy to remove in the operation process of the heat exchanger, and the heat exchange efficiency is improved. And the heat exchange surface is not easy to block, the pressure loss cannot rise after long-term operation, the energy consumption is effectively reduced, and the practicability of the heat exchange assembly is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air preheater heat exchange, and specifically, to an air preheater heat exchange component. Background Art

[0002] An air preheater is a heating surface in the flue gas duct at the tail of a boiler that preheats the air entering the boiler to a certain temperature through internal fins. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption. The blockage of the heat exchange elements of a three-compartment rotary air preheater is a common problem. In an environment with relatively low temperatures, the pressure difference during the operation of the cold end of the air preheater rises rapidly, and the effect of online water flushing is not obvious, seriously affecting the operation economy and safety of the unit.

[0003] In the prior art, the heat exchange components at the cold end of the air preheater are prone to attaching impurities such as ammonium bisulfate and dust, and are not convenient for purging and cleaning, unable to effectively slow down the blockage of the heat exchange elements of the air preheater, affecting the use of the air preheater heat exchange components, and their practicability and durability need to be improved. At the same time, for example, the utility model patent with the publication number of CN210802188U discloses a strengthened heat exchange element and an air preheater, including: a frame, the frame includes narrow-end column metal plates and wide-end column metal plates, the narrow-end column metal plates and the wide-end column metal plates are fixedly connected through corner metal plates, the two narrow-end column metal plates are connected through a narrow-end connecting metal plate, the two wide-end column metal plates are connected through a wide-end connecting metal plate, and a plurality of flat steels are arranged between the narrow-end connecting metal plate and the wide-end connecting metal plate. One end of each of the plurality of flat steels is fixedly connected to the narrow-end connecting metal plate, and the other end is fixedly connected to the wide-end connecting metal plate; a plurality of strengthening heavy-duty plates are spaced and clamped on the plurality of flat steels; a plurality of heat exchange fins are spaced and distributed in the areas of the frame separated by the plurality of strengthening heavy-duty plates, which cannot effectively slow down the blockage of the heat exchange elements of the air preheater, and its practicability and durability need to be improved. Summary of the Utility Model

[0004] To overcome the problems in the prior art that the heat exchange components of the air preheater are prone to attaching impurities such as ammonium bisulfate and dust, and are not convenient for purging and cleaning, unable to effectively slow down the blockage of the heat exchange elements of the air preheater, affecting the use of the air preheater heat exchange components, and their practicability and durability need to be improved, etc., the utility model provides an air preheater heat exchange component, including an outer frame, a partition board and heat exchange fins. The outer frame is a three-dimensional frame, and a partition board is arranged on the side wall of the outer frame. A plurality of heat exchange fins are stacked and arranged inside the outer frame, and each heat exchange fin is a large-channel corrugated plate.

[0005] A number of heat exchange components are combined and arranged at the cold end of a rotary air preheater. The hot end and the medium-temperature end of the air preheater are conventional heat exchange elements. As the air preheater operates, under the action of the corrugated heat exchange fins with large channels, the flue gas flow cross-section can be made large, the waveform is smooth, and impurities such as ammonium bisulfate, dust, and coal cinder are not easily attached during the operation of the heat exchanger and are also easy to remove. Moreover, the heat exchange surface is not easily blocked, and the pressure loss will not increase after long-term operation, effectively reducing energy consumption and greatly improving the practicability of the heat exchange components.

[0006] Preferably, a number of large channels are formed on the surface of the heat exchange fin along the vertical direction, and waveform channels with opposite protruding directions are connected to both sides of each large channel and are interconnected to form corrugations.

[0007] Preferably, the length of the heat exchange fin is 500 mm and the thickness is 0.75 mm.

[0008] Preferably, a strengthening layer is provided on the heat exchange fin, and a protective layer is provided on the outer surface of the heat exchange fin.

[0009] Preferably, the material of the protective layer is an enamel layer.

[0010] By providing the strengthening layer on the surface of the heat exchange fin, its use strength can be improved and it is not easily damaged. By providing the protective layer on the surface of the heat exchange fin, its high-temperature resistance and corrosion resistance can be improved, making it have good durability.

[0011] Preferably, the material of the heat exchange fin is stainless steel.

[0012] Preferably, limit plates that fit the tops and bottoms of a number of the heat exchange fins are respectively provided at the top and bottom of the outer frame. The limit plates are cross-shaped limit plates, and the limit plates are connected to the outer frame by bolts.

[0013] Preferably, partition plates are respectively provided on the front and back of the outer frame, and reinforcing ribs are provided on the partition plates.

[0014] By providing the partition plates on the side walls of the heat exchange components, the heat exchange fins can be limited to avoid side blowing of the air flow. At the same time, by providing the reinforcing ribs on the partition plates, the partition plates can be prevented from deforming and squeezing the heat exchange fins.

[0015] Preferably, high-temperature resistant coatings are provided on the surfaces of the outer frame and the partition plates.

[0016] Preferably, fixing plates are respectively connected to both sides of the outer frame, and a number of fixing holes are formed on the surfaces of the fixing plates.

[0017] Through the fixing holes and the fixing plates, it is convenient to install and fix the entire heat exchange component on the air preheater.

[0018] Beneficial effects:

[0019] The beneficial effects produced by adopting the technical solution of the present utility model are as follows:

[0020] (1) A number of heat exchange components are combined and arranged at the cold end of the rotary air preheater. The hot end and the medium-temperature end of the air preheater are conventional heat exchange elements. As the air preheater operates, under the action of the corrugated heat exchange fins with large channels, the flue gas flow cross-section is large, the waveform is smooth, and impurities such as ammonium bisulfate, dust, and coal cinder are not easily attached during the operation of the heat exchanger, and are also easy to remove. Moreover, the heat exchange surface is not easily blocked, and the pressure loss will not increase after long-term operation, effectively reducing energy consumption and greatly improving the practicability of the heat exchange components.

[0021] (2) By arranging a strengthening layer on the surface of the heat exchange fins, the service strength can be improved and it is not easily damaged. By arranging a protective layer on the surface of the heat exchange fins, the high-temperature and corrosion-resistant performance can be improved, making it have good durability.

[0022] (3) By arranging a partition on the side wall of the heat exchange component, the heat exchange fins can be limited to avoid side blowing of the air flow. At the same time, strengthening ribs are arranged on the partition to avoid deformation of the partition and extrusion of the heat exchange fins. Description of the drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is an overall three-dimensional structure schematic diagram of the air preheater heat exchange component of the present utility model;

[0025] Figure 2 It is a front connection structure schematic diagram of the air preheater heat exchange component of the present utility model;

[0026] Figure 3 It is a plan view of the heat exchange fins on the air preheater heat exchange component of the present utility model;

[0027] Figure 4 It is a top view structure diagram of the air preheater heat exchange component of the present utility model;

[0028] Figure 5 It is a cross-sectional view of the heat exchange fins on the air preheater heat exchange component of the present utility model;

[0029] Figure 6 It is an internal structure diagram of the heat exchange fins on the air preheater heat exchange component of the present utility model.

[0030] In the figure: 1. Outer frame; 2. Partition board; 3. Heat exchange fin; 4. Limit board; 5. Fixed board; 6. Fixed hole; 7. Large channel; 8. Corrugated channel; 9. Reinforcement layer; 10. Protective layer. Specific embodiments

[0031] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] In this embodiment, by combining a plurality of heat exchange components at the cold end of the rotary air preheater, as the air preheater operates, under the action of the corrugated heat exchange fins with large channels, the flue gas flow cross-section can be large, the waveform is smooth, and impurities such as ammonium bisulfate, dust, and coal cinder are not easily attached during the operation of the heat exchanger and are also easy to remove. Moreover, the heat exchange surface is not easily blocked, and the pressure loss will not increase after long-term operation, effectively reducing energy consumption and greatly improving the practicability of the heat exchange components. The specific embodiments are as follows:

[0033] As Figures 1 to 6 shown, a heat exchange component of an air preheater includes an outer frame 1, a partition board 2, and heat exchange fins 3. The outer frame 1 is a three-dimensional frame, and a partition board 2 is provided on the side wall of the outer frame 1. A plurality of heat exchange fins 3 are stacked inside the outer frame 1, and each heat exchange fin 3 is a corrugated plate with a large channel. By combining a plurality of heat exchange components at the cold end of the rotary air preheater, the hot end and the medium-temperature end of the air preheater are conventional heat exchange elements. As the air preheater operates, under the action of the corrugated heat exchange fins 3 with large channels 7, the flue gas flow cross-section can be large, the waveform is smooth, and impurities such as ammonium bisulfate, dust, and coal cinder are not easily attached during the operation of the heat exchanger and are also easy to remove. Moreover, the heat exchange surface is not easily blocked, and the pressure loss will not increase after long-term operation, effectively reducing energy consumption and greatly improving the practicability of the heat exchange components.

[0034] A plurality of large channels 7 are formed on the surface of the heat exchange fin 3 in the vertical direction, and waveform channels 8 with opposite convex directions are connected to both sides of each large channel 7 and are connected to each other to form corrugations. Through the setting of large straight corrugations, the heat exchange fins are easy to clean, anti-blocking, and have low resistance during long-term operation.

[0035] The length of the heat exchange fin 3 is 500 mm and the thickness is 0.75 mm. The length and thickness of the heat exchange fin 3 can be adjusted according to the actual situation of ash fouling.

[0036] A strengthening layer 9 is provided on the heat exchange fin 3, and a protective layer 10 is provided on the outer surface of the heat exchange fin 3. By providing the strengthening layer 9 on the surface of the heat exchange fin, its service strength can be improved and it is not easily damaged. By providing the protective layer 10 on the surface of the heat exchange fin 3, its high temperature resistance and corrosion resistance can be improved, making it have good durability.

[0037] The material of the protective layer 10 is an enamel layer. Enamel is a composite material that solidifies inorganic vitreous materials on the substrate metal by melting and firmly binds with the metal. It can prevent the metal from rusting, prevent the metal from forming an oxide layer on the surface when heated, and can resist the erosion of various liquids, and has excellent properties such as high hardness, high temperature resistance, wear resistance, and insulation.

[0038] The material of the heat exchange fin 3 is stainless steel, which can improve the basic characteristics of the heat exchange fin.

[0039] Limit plates 4 that fit the tops and bottoms of several heat exchange fins 3 are respectively provided at the top and bottom of the outer frame 1. The limit plates 4 are cross-shaped limit plates, and the limit plates 4 are connected to the outer frame 1 by bolts. Through the limit plates 4, the heat exchange fins 3 can be limited vertically. After removal, it is convenient to clean and replace the heat exchange fins 3.

[0040] Partition plates 2 are respectively provided on the front and back of the outer frame 1, and reinforcing ribs are provided on the partition plates 2. By providing the partition plates 2 on the side walls of the heat exchange assembly, the heat exchange fins 3 can be limited to avoid side blowing of the air flow. At the same time, by providing reinforcing ribs on the partition plates 2, the partition plates 2 can be prevented from deforming and squeezing the heat exchange fins 3.

[0041] High temperature resistant coatings are provided on the surfaces of the outer frame 1 and the partition plates 2. By providing the high temperature resistant coatings, the high temperature resistance of the outer frame 1 and the steel plates 2 can be improved, avoiding damage to them due to high temperature during the operation of the air preheater, thereby affecting the use of the heat exchange assembly.

[0042] Fixing plates 5 are respectively connected to both sides of the outer frame 1, and a number of fixing holes 6 are formed on the surfaces of the fixing plates 5. Through the fixing holes 6 and the fixing plates 5, it is convenient to install and fix the entire heat exchange assembly on the air preheater.

[0043] Working principle: A number of heat exchange components are combined and arranged at the cold end of the rotary air preheater. The hot end and the medium-temperature end of the air preheater are conventional heat exchange elements. As the air preheater operates, under the action of the corrugated heat exchange fins with large channels, the flue gas flow cross-section is large and the waveform is smooth. During the operation of the heat exchanger, impurities such as ammonium bisulfate, dust, and coal cinder are not easily attached and are also easy to remove. Moreover, the heat exchange surface is not easily blocked, and the pressure loss will not increase after long-term operation, effectively reducing energy consumption and greatly improving the practicability of the heat exchange components. By providing a reinforcing layer on the surface of the heat exchange fins, the service strength can be improved and it is not easily damaged. By providing a protective layer on the surface of the heat exchange fins, the high-temperature and corrosion-resistant performance can be improved, making it have good durability. By providing a partition on the side wall of the heat exchange component, the heat exchange fins can be limited to avoid side blowing of the air flow. At the same time, reinforcing ribs are provided on the partition to prevent the partition from deforming and squeezing the heat exchange fins.

[0044] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air preheater heat exchange component, characterized in that It includes an outer frame (1), a partition plate (2) and heat exchange fins (3). The outer frame (1) is a three-dimensional frame, and the partition plate (2) is arranged on the side wall of the outer frame (1). A number of heat exchange fins (3) are stacked inside the outer frame (1), and each heat exchange fin (3) is a large-channel corrugated plate.

2. The heat exchange component of the air preheater according to claim 1, characterized in that, A number of large channels (7) are formed on the surface of the heat exchange fin (3) in the vertical direction. Oppositely protruding corrugated channels (8) are connected to both sides of each large channel (7) and are connected to each other to form corrugations.

3. The heat exchange component of the air preheater according to claim 1, characterized in that, The length of the heat exchange fin (3) is 500 mm, and the thickness is 0.75 mm.

4. The heat exchange component of an air preheater according to claim 1, wherein, A strengthening layer (9) is arranged on the heat exchange fin (3), and a protective layer (10) is arranged on the outer surface of the heat exchange fin (3).

5. The heat exchange component of the air preheater according to claim 4, characterized in that, The material of the protective layer (10) is an enamel layer.

6. The heat exchange component of an air preheater according to claim 1, wherein The material of the heat exchange fin (3) is stainless steel.

7. The heat exchange component of an air preheater according to claim 1, wherein Limit plates (4) that fit with the tops and bottoms of a number of the heat exchange fins (3) are respectively arranged at the top and bottom of the outer frame (1). The limit plates (4) are cross-shaped limit plates, and the limit plates (4) are connected to the outer frame (1) by bolts.

8. The heat exchange component of an air preheater according to claim 1, characterized in that Partition plates (2) are respectively arranged on the front and back of the outer frame (1), and reinforcing ribs are arranged on the partition plates (2).

9. The heat exchange component of an air preheater according to claim 1, characterized in that, High-temperature resistant coatings are arranged on the surfaces of the outer frame (1) and the partition plate (2).

10. A heat exchange component of an air preheater according to claim 1, characterized in that, Fixing plates (5) are respectively connected to both sides of the outer frame (1), and a number of fixing holes (6) are formed on the surfaces of the fixing plates (5).

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