Heat exchange element of an air preheater

Abstract

The utility model is suitable for air preheater technical field provides a kind of heat exchange element of air preheater, including wave-shaped plate and positioning plate of interlaced stacking;Wave-shaped plate and positioning plate form flue gas and air passage between them;Heat exchange element is based on the level of flue gas temperature of the part where it is located, and is divided into hot section, warm section and cold section;The passage of cold section is crimpled part;Warm section is transverse herringbone wave-shaped part, and hot section is HC wave-shaped part, wherein, the passage of crimpled part is narrower than the passage of HC wave-shaped part;Transverse herringbone wave-shaped part has multiple oblique passages, and herringbone-shaped passage is formed between adjacent two oblique passages, and herringbone-shaped passage is used to connect to the opening of the passage of downstream HC wave-shaped part after the airflow of two crimpled parts is converged.The heat exchange element of the utility model effectively eliminates oblique airflow and corner corrosion and dust blocking problem, and optimizes the entire surface performance.

Description

Technical Field

[0001] This utility model belongs to the field of air heat exchanger technology, and in particular relates to a heat exchange element of an air preheater. Background Technology

[0002] As the core component of an air preheater, the heat exchange element directly affects the thermodynamic and aerodynamic performance of the air preheater. The selection of the heat exchange element waveform must take into account factors such as heat transfer efficiency, resistance characteristics, anti-fouling, and cleanability.

[0003] Heat exchange elements are periodically subjected to high-energy impact forces from sootblower cleaning of the heat exchange surface, as well as alternating stresses caused by pressure differentials and airflow pressure fluctuations on the flue gas side of the air preheater. This places higher demands on the mechanical properties of the heat exchange elements. The mechanical properties of heat exchange elements are directly related to different corrugation types, different element box types, and the clamping force used when packing the element boxes.

[0004] Currently, deposits tend to adhere to the surface of heat exchange elements in related technologies, reducing the jet penetration of sootblowers, affecting heat exchange efficiency, and failing to effectively alleviate fatigue damage to heat exchange elements, thus reducing their lifespan. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a heat exchange element for an air preheater, so as to at least solve the technical problem that surface deposits easily adhere to the heat exchange elements of related technologies, reducing the jet penetration of the soot blower and affecting the heat exchange efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] A heat exchange element for an air preheater includes corrugated plates and positioning plates stacked alternately.

[0008] A channel for smoke and air is formed between the corrugated plate and the positioning plate;

[0009] Based on the flue gas temperature level at its location, the heat exchange element is divided into a hot section, a warm section, and a cold section. The cold section has a corrugated channel; the warm section has a transverse herringbone wave section; and the hot section has an HC wave section. The channels in the corrugated section are narrower than those in the HC wave section. The transverse herringbone wave section has multiple oblique channels, and a herringbone channel is formed between two adjacent oblique channels. The herringbone channel is used to merge the airflow from the channels of the two corrugated sections and connect it to the opening of the channel of the downstream HC wave section.

[0010] Preferably, both the corrugated plate and the positioning plate are rolled from thin steel plates.

[0011] Preferably, it also includes a soot blower connected to the outlet of the soot blowing pipe, the soot blower being used to blow soot into the channel formed by the heat exchange element.

[0012] Preferably, the blower is positioned directly opposite the channel of the wrinkled section.

[0013] Preferably, the corrugation amplitude of the positioning plate is smaller than that of the corrugated plate.

[0014] Preferably, the corrugated plates and positioning plates stacked alternately are fixed together by a pre-tightening assembly.

[0015] Preferably, the pretensioning assembly includes a first fixing seat mounted on the upper frame and a second fixing seat mounted on the lower frame; it also includes a tensioning member for connecting and fixing the first fixing seat and the second fixing seat.

[0016] Preferably, the tensioning component is a tensioning screw, wherein one end of the tensioning screw is connected to the first fixed seat, and the other end of the tensioning screw is fixed to the second fixed seat by a nut. By tightening the nut, the preload between the first fixed seat and the second fixed seat is adjusted so that the corrugated plates and positioning plates stacked alternately maintain the required clamping force.

[0017] Preferably, the frame is also provided with lifting holes.

[0018] Compared with the prior art, the beneficial effects of the heat exchange element of the air preheater provided in this embodiment are:

[0019] The soot blowing inlet of the airflow channel is located at the wrinkled part. The use of wrinkled and transverse herringbone waveforms can effectively eliminate the cold corner problem and oblique flow in each corrugation, resulting in stronger permeability. It effectively eliminates oblique airflow, edge corrosion and ash blockage problems, and optimizes the overall surface performance.

[0020] The corrugation amplitude of the positioning plate is smaller than that of the corrugated plate. The corrugated plate has a large corrugation structure, which is a structure with large disturbance and large contact area, and is used for efficient heat exchange. The positioning plate is used for structural stability and plays a role in micro-turbulence and interlayer support. The cooperation between the positioning plate and the corrugated plate prevents the large corrugated plate from deforming and blocking the flow channel when used alone. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention.

[0022] In the attached diagram:

[0023] Figure 1 A structural diagram of a heat exchange element of an air preheater provided in an embodiment of this utility model;

[0024] Figure 2 A front view of the heat exchange element of the air preheater provided in an embodiment of this utility model;

[0025] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0026] The above figures include the following reference numerals:

[0027] 1. Frame; 11. First fixing seat; 12. Second fixing seat; 13. Tensioning screw;

[0028] 2. Corrugated sheet;

[0029] 3. Positioning plate;

[0030] 4. Airflow channel; 41. Wrinkled section; 42. Horizontal herringbone wave section; 43. HC wave section;

[0031] 5. Soot blower; 51. Soot blowing pipe. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0035] Please refer to Figures 1-3 According to one embodiment of the present invention, a heat exchange element for an air preheater is provided to solve the problem of abnormal ash blockage caused by burning high-sulfur and high-ash coal.

[0036] Specifically, the heat exchange element provided in this embodiment includes corrugated plates 2 and positioning plates 3 stacked alternately. A flue gas and air channel is formed between the corrugated plates 2 and the positioning plates 3. When the airflow flows in the channel, it is disturbed, which enhances the convective heat transfer process between the airflow and the heat exchange element.

[0037] In this embodiment, both the corrugated plate 2 and the positioning plate 3 are rolled from thin steel plates;

[0038] The heat exchange element provided in this embodiment is divided into a hot section, a warm section, and a cold section based on the flue gas temperature level at its location.

[0039] In this embodiment, the cold section of the heat exchange element has a corrugated section 41; the warm section has a transverse herringbone waveform section 42; and the hot section has an HC waveform section 43. The channel of the corrugated section 41 is narrower than the channel of the HC waveform section 43.

[0040] like Figure 3 As shown, the dust inlet of the airflow channel 4 is located at the location of the wrinkled section 41. The use of wrinkles and transverse herringbone waveforms can effectively eliminate cold corner problems and oblique flow within each corrugation, optimizing performance and dust removal capability of the entire surface.

[0041] In one implementation of this embodiment, the transverse herringbone waveform section 42 provided in this embodiment has multiple oblique channels, and a herringbone channel is formed between two adjacent oblique channels. The herringbone channel is used to merge the airflow of the two wrinkled sections 41 and connect it to the opening of the channel of the downstream HC waveform section 43.

[0042] The corrugated plate 2 provided in this embodiment has a waveform channel parallel to the air preheater axis. The introduction of a transverse herringbone plate makes the corrugations more regular and the permeability stronger, effectively eliminating oblique airflow, corner corrosion and ash blockage problems, and optimizing the overall surface performance.

[0043] In addition, compared to the traditional DU waveform, where the jet is dispersed across multiple plates, forming a tortuous flow path and easily flowing to the side, further reducing the cleaning effect, the HC heat exchange element channel provided in this embodiment can maintain the jet energy, thereby making the cleaning more effective.

[0044] Furthermore, the heat exchange element provided in this embodiment also includes a soot blower 5, which is connected to the outlet of the soot blowing pipe 51. The soot blower 5 is used to blow soot into the channel formed by the heat exchange element. Specifically, the soot blower 5 is directly facing the channel of the wrinkled part 41 and is used to blow soot into the channel of the wrinkled part 41.

[0045] Please continue to refer to Figure 2 and Figure 3 In this embodiment, the corrugation amplitude of the positioning plate 3 is smaller than that of the corrugated plate 2. The corrugated plate 3 has a large corrugation structure, which is a structure with large disturbance and large contact area, and is used for efficient heat exchange. The positioning plate 2 is used for structural stability and plays the role of micro-turbulence and interlayer support. The cooperation between the positioning plate 2 and the corrugated plate 3 prevents the large corrugated plate from deforming and blocking the flow channel when used alone.

[0046] Please continue to refer to Figure 1 The corrugated plates 2 and positioning plates 3, which are stacked alternately, are fixed together by a pre-tightening assembly;

[0047] In one implementation, the pretensioning assembly includes a first fixing seat 11 mounted on the frame 1, and a second fixing seat 12 mounted on the lower part of the frame 1; it also includes a tensioning member for connecting and fixing the first fixing seat 11 and the second fixing seat 12.

[0048] Preferably, in this embodiment, the tensioning component is a tensioning screw 13, wherein one end of the tensioning screw 13 is connected to the first fixed seat 11, and the other end of the tensioning screw 13 is fixed to the second fixed seat 12 by a nut. By tightening the nut, the preload between the first fixed seat 11 and the second fixed seat 12 is adjusted so that the corrugated plates 2 and the positioning plates 3 stacked alternately maintain the required clamping force.

[0049] In a preferred embodiment, the frame 1 of this embodiment is also provided with a lifting hole, which is very convenient for the installation of heat exchange elements, inspection and replacement during maintenance.

[0050] The above solutions are merely illustrative examples of preferred embodiments, but are not limited thereto. When implementing this invention, appropriate substitutions and / or modifications can be made according to the user's needs.

[0051] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0052] Although embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A heat exchange element for an air preheater, characterized in that, Includes wave plates (2) stacked in alternating phases and positioning plates (3); A flue gas and air passage is formed between the corrugated plate (2) and the positioning plate (3); Based on the flue gas temperature level at which the heat exchange element is located, it is divided into hot section, warm section and cold section; The cold section has a wrinkled section (41); the warm section has a transverse herringbone waveform section (42); and the hot section has an HC waveform section (43). The channel of the wrinkled section (41) is narrower than the channel of the HC waveform section (43). The transverse herringbone waveform section (42) has multiple oblique channels, and a herringbone channel is formed between two adjacent oblique channels. The herringbone channel is used to merge the airflow of the two wrinkled sections (41) and connect it to the opening of the channel of the downstream HC waveform section (43).

2. The heat exchange element of an air preheater according to claim 1, characterized in that, Both the corrugated plate (2) and the positioning plate (3) are rolled from thin steel plates.

3. The heat exchange element of an air preheater according to claim 2, characterized in that, It also includes a soot blower (5), which is connected to the outlet of the soot blowing pipe (51). The soot blower (5) is used to blow soot into the channel formed by the heat exchange element.

4. The heat exchange element of the air preheater according to claim 3, characterized in that, The blower (5) is positioned directly opposite the channel of the wrinkled part (41).

5. The heat exchange element of an air preheater according to any one of claims 2 to 4, characterized in that, The corrugation amplitude of the positioning plate (3) is smaller than that of the corrugated plate (2).

6. The heat exchange element of an air preheater according to claim 5, characterized in that, The corrugated plates (2) and positioning plates (3) are fixed together by a pre-tightening assembly.

7. The heat exchange element of an air preheater according to claim 6, characterized in that, The pretensioning assembly includes a first fixing seat (11) mounted on the frame (1) and a second fixing seat (12) mounted on the lower part of the frame (1); it also includes a tensioning member for connecting and fixing the first fixing seat (11) and the second fixing seat (12).

8. The heat exchange element of an air preheater according to claim 7, characterized in that, The tensioning component is a tensioning screw (13), one end of which is connected to the first fixed seat (11), and the other end of which is fixed to the second fixed seat (12) by a nut. The preload between the first fixed seat (11) and the second fixed seat (12) is adjusted by tightening the nut.

9. The heat exchange element of an air preheater according to claim 8, characterized in that, The frame (1) is also provided with lifting holes.

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