CN222773851U - A coaxial flue gas air preheater - Google Patents
A coaxial flue gas air preheater Download PDFInfo
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- CN222773851U CN222773851U CN202421645600.9U CN202421645600U CN222773851U CN 222773851 U CN222773851 U CN 222773851U CN 202421645600 U CN202421645600 U CN 202421645600U CN 222773851 U CN222773851 U CN 222773851U
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- air
- flue gas
- flow channel
- coaxial
- heat exchange
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
本实用新型的目的在于公开一种同轴烟气空预器，由不同半径的同轴的不锈钢圆管构成，相邻的不锈钢圆管之间构成烟气流道和空气流道，烟气流道布置有等截面直肋，空气流道布置有圆形针肋，既增强了扰流，提高了换热效率，又起到支撑流道，阻止空预器在压差作用下变形的作用；结构紧凑，可以根据现场换热工况，直接与现场烟气管道进行同轴连接，易于安装与拆卸，不占用额外空间尺寸；烟气与空气呈逆流换热方式，可缩小空预器的端差，进一步降低排烟温度，提高锅炉效率；采用全焊式密封方式，可以实现零漏风，实现本实用新型的目的。
The purpose of the utility model is to disclose a coaxial flue gas air preheater, which is composed of coaxial stainless steel circular tubes with different radii. Adjacent stainless steel circular tubes form flue gas flow channels and air flow channels. The flue gas flow channels are arranged with straight ribs of equal cross-section, and the air flow channels are arranged with circular pin ribs, which not only enhance the turbulence and improve the heat exchange efficiency, but also support the flow channels and prevent the air preheater from deforming under the action of pressure difference. The structure is compact and can be directly coaxially connected to the on-site flue gas pipeline according to the on-site heat exchange conditions. It is easy to install and disassemble and does not occupy additional space. The flue gas and air are in a countercurrent heat exchange mode, which can reduce the end difference of the air preheater, further reduce the exhaust temperature and improve the boiler efficiency. The full-welded sealing method is adopted to achieve zero air leakage and achieve the purpose of the utility model.
Description
Technical Field
The utility model relates to air heat exchanger equipment, in particular to a coaxial smoke air preheater.
Background
In the industrial production of China, besides heavy industrial boilers used in industries such as power generation, chemical industry, metallurgy and the like, a large number of small and medium-sized boilers are also distributed for light industries such as food, tobacco, paper making and the like, the heat loss of the boilers is mainly smoke exhaust loss, and in order to recover smoke waste heat and improve the boiler efficiency, a large number of boilers are all provided with smoke air pre-heaters.
The smoke discharging temperature of the medium-sized and small-sized boiler is lower, the smoke flow is smaller, the space size is generally limited, new requirements are provided for the heat exchanging performance and the size parameter of the smoke air preheater, the corrugated plate type air preheater which is more in application currently is larger in size, the pressure loss is high, and the cross flow heat exchanging mode is adopted, so that the heat exchanging efficiency is reduced.
Therefore, there is a particular need for a coaxial flue gas air preheater to address the above-described existing problems.
Disclosure of utility model
The utility model aims to provide a coaxial flue gas air preheater, which is suitable for waste heat recovery of medium and small boiler flue gas and has the advantages of compact structure, small flow resistance, high heat transfer efficiency and convenient installation.
The technical problems solved by the utility model can be realized by adopting the following technical scheme:
A coaxial flue gas air preheater comprises a coaxial heat exchange core body, wherein the coaxial heat exchange core body is composed of coaxial stainless steel round pipes with different diameters, a flue gas flow channel and an air flow channel are formed between the adjacent stainless steel round pipes, the flue gas flow channel and the air flow channel are arranged in a staggered mode along the radial direction, constant-section straight ribs for supporting the flow channel are arranged on the flue gas flow channel, round needle ribs for supporting the flow channel are arranged on the air flow channel, the heat exchange area is increased, turbulence is enhanced, the heat exchange efficiency of the air preheater is improved, air inlet branch pipe openings and air outlet branch pipe openings which are arranged in an annular mode are arranged at the upper edge and the lower edge of the stainless steel round pipes, annular steel sheets for sealing the air flow channel are welded on the upper plane and the lower plane of the air flow channel, an air inlet joint and the air outlet joint are respectively connected with the upper plane and the lower plane of the coaxial heat exchange core body, and flue gas and air are in a countercurrent heat exchange mode.
In a preferred embodiment of the utility model, the distance between the flue gas flow channel and the air flow channel is 2mm-10mm.
In a preferred embodiment of the utility model, the width of the constant section straight rib is 0.5mm-1mm.
In a preferred embodiment of the utility model, the circular needle rib has a diameter of 0.4mm-1mm.
Compared with the prior art, the coaxial smoke air preheater is composed of coaxial stainless steel circular pipes with different radiuses, a smoke flow channel and an air flow channel are formed between the adjacent stainless steel circular pipes, the smoke flow channel is provided with straight ribs with equal cross sections, the air flow channel is provided with circular needle ribs, so that turbulence is enhanced, heat exchange efficiency is improved, the air preheater also plays a role in supporting the flow channel and preventing deformation of the air preheater under the action of pressure difference, the coaxial smoke air preheater is compact in structure, can be directly and coaxially connected with a field smoke pipeline according to the field heat exchange working condition, is easy to install and detach, does not occupy extra space size, and has a countercurrent heat exchange mode between smoke and air, so that the end difference of the air preheater is reduced, the smoke exhaust temperature is further reduced, the boiler efficiency is improved, and the purpose of zero air leakage can be realized by adopting a full-welding sealing mode.
The features of the present utility model will be apparent from the following detailed description of the preferred embodiments, taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a coaxial flue gas air preheater of the present utility model;
FIG. 2 is a schematic view of the coaxial heat exchange core of the present utility model;
FIG. 3 is a schematic view of an inclined cross section of a coaxial heat exchange core of the present utility model;
fig. 4 is a schematic view of an axial cross-section of a coaxial heat exchange core of the present utility model.
The drawing shows that the heat exchange core body is 1-coaxial, the smoke inlet joint is 2-coaxial, the smoke outlet joint is 3-smoke outlet joint, the air inlet joint is 4-air, the air outlet joint is 5-air, the stainless steel round tube is 11-stainless steel round tube, the opening of the air inlet branch pipe is 12-air, the opening of the air outlet branch pipe is 13-air, the annular steel sheet is 14-, the straight rib with 15-equal section and the circular needle rib is 16-circular.
Detailed Description
The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.
Examples
As shown in fig. 1 to 4, the coaxial flue gas air preheater of the present utility model is composed of a coaxial heat exchange core 1, a flue gas inlet joint 2, a flue gas outlet joint 3, an air inlet joint 4 and an air outlet joint 5.
The coaxial heat exchange core body 1 is composed of coaxial stainless steel round pipes 11 with different diameters, a flue gas flow passage and an air flow passage are formed between the adjacent stainless steel round pipes 11, the flue gas flow passage and the air flow passage are arranged in a staggered mode along the radial direction, wherein the flue gas flow passage is provided with straight ribs 15 with uniform cross sections for supporting the flow passage, the air flow passage is provided with round needle ribs 16 for supporting the flow passage, all rib structures play roles in increasing heat exchange area, enhancing turbulence and improving heat exchange efficiency of the air preheater, air inlet branch pipe openings 12 and air outlet branch pipe openings 13 which are arranged in an annular mode are arranged at the upper edge and the lower edge of the stainless steel round pipes 11, annular steel sheets 14 for sealing the air flow passage are welded on the upper plane and the lower plane of the air flow passage, the air inlet joint 4 and the air outlet joint 5 are respectively connected with the air inlet branch pipe openings 12 and the air outlet branch pipe openings 13, the flue gas inlet joint 2 and the flue gas outlet joint 3 are connected with the upper plane and the lower plane of the coaxial heat exchange core body 1, and the flue gas and air are in a countercurrent heat exchange mode.
Referring to fig. 1 and 2, high-temperature flue gas enters from a flue gas inlet joint 2, the temperature is reduced after heat exchange through a coaxial heat exchange core 1, low-temperature air flows out from a flue gas outlet joint 3, low-temperature air enters from an air inlet joint 4, then enters into the coaxial heat exchange core 1 through an air inlet branch pipe opening 12, the temperature rises after heat exchange through the coaxial heat exchange core 1, flows out from the coaxial heat exchange core 1 through an air outlet branch pipe opening 13, and finally is discharged through an air outlet joint 5, and the existence of an annular steel sheet 14 plays a role in sealing an air flow passage, so that the flue gas is ensured not to enter the air flow passage.
Referring to fig. 3, the constant section straight rib 15 plays a role in supporting the flue gas flow passage, and the circular needle rib 16 plays a role in supporting the air flow passage, so that the existence of the rib ensures that the air preheater cannot deform due to the existence of a pressure difference.
The coaxial smoke air preheater has the advantages of compact structure, cylindrical appearance, direct coaxial connection with a site smoke pipeline according to site heat exchange working conditions, easiness in installation and disassembly, no extra space occupation, adoption of straight ribs with uniform cross sections for smoke flow channels, small smoke flow resistance, adoption of circular needle ribs for air flow channels, great improvement of heat exchange efficiency, general micro negative pressure on the smoke side, positive pressure on the air side, resistance to deformation caused by pressure difference due to the existence of the ribs, and capability of reducing the end difference of the air preheater in a countercurrent heat exchange mode of smoke and air, further reduction of smoke discharge temperature and improvement of boiler efficiency.
The coaxial smoke air preheater provided by the utility model adopts a full-welding type sealing mode, so that zero air leakage can be realized.
The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, which have been described in the foregoing embodiments and description merely illustrates the principles of the utility model, and that various changes and modifications may be effected therein without departing from the spirit and scope of the utility model as defined in the appended claims and their equivalents.
Claims (4)
1. A coaxial smoke air preheater is characterized by comprising a coaxial heat exchange core body, wherein the coaxial heat exchange core body is composed of coaxial stainless steel round pipes with different diameters, a smoke flow channel and an air flow channel are formed between the adjacent stainless steel round pipes, the smoke flow channel and the air flow channel are arranged in a staggered mode along the radial direction, uniform-section straight ribs for supporting the flow channel are arranged on the smoke flow channel, round needle ribs for supporting the flow channel are arranged on the air flow channel, annular air inlet branch pipe openings and air outlet branch pipe openings which are arranged in an annular mode are arranged at the upper edge and the lower edge of the stainless steel round pipes, annular steel sheets for sealing the air flow channel are welded on the upper surface and the lower surface of the air flow channel, an air inlet joint and an air outlet joint are respectively connected with the air inlet branch pipe openings and the air outlet branch pipe openings, and the smoke and the air are in a countercurrent heat exchange mode.
2. The coaxial flue gas air preheater according to claim 1, wherein the spacing between the flue gas flow channel and the air flow channel is 2mm to 10mm.
3. The coaxial flue gas air preheater of claim 1, wherein the constant cross section straight rib has a width of 0.5mm to 1mm.
4. The coaxial flue gas air preheater of claim 1, wherein the circular pin ribs have a diameter of 0.4mm to 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421645600.9U CN222773851U (en) | 2024-07-11 | 2024-07-11 | A coaxial flue gas air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421645600.9U CN222773851U (en) | 2024-07-11 | 2024-07-11 | A coaxial flue gas air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222773851U true CN222773851U (en) | 2025-04-18 |
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ID=95351737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421645600.9U Active CN222773851U (en) | 2024-07-11 | 2024-07-11 | A coaxial flue gas air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222773851U (en) |
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2024
- 2024-07-11 CN CN202421645600.9U patent/CN222773851U/en active Active
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