Efficient air preheater of through-flow boiler

Abstract

The utility model relates to the technical field of boilers, in particular to a through-flow boiler efficient air preheater which comprises a shell, a smoke inlet is formed in one side of the bottom of the shell, a smoke outlet is formed in the top of the shell, a plurality of heat exchange smoke pipes are vertically installed in the shell, and pipe plates are installed at the positions, close to the upper ends and the lower ends of the heat exchange smoke pipes, in the shell. A cold air inlet is formed in one side of the upper portion of the shell, and a hot air outlet is formed in one side of the lower portion of the shell. According to the efficient air preheater of the through-flow boiler, the remarkable technical effect is achieved by optimizing the structural design and improving the heat exchange efficiency. Specifically, according to the preheater, heat exchange smoke pipes which are vertically arranged are adopted and matched with pipe plates at the upper end and the lower end, and an efficient heat exchange channel is formed. Meanwhile, the heat exchange effect between the flue gas and the air is further enhanced through the arrangement of the air folding plates, and the heat energy utilization rate is increased. In addition, due to the reasonable layout of the cold air inlet and the hot air outlet, sufficient flowing and heat exchange of air in the preheater are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a high-efficiency air preheater for a through-flow boiler. Background Art

[0002] In the field of boiler technology, improving combustion efficiency and thermal energy utilization has always been an important research direction. As a common type of boiler, the operating efficiency of a through-flow boiler is directly affected by the performance of the air preheater.

[0003] Traditional air preheaters suffer from structural design and heat exchange efficiency deficiencies, often leading to inadequate heat exchange between flue gas and air, impacting the boiler's overall thermal efficiency. Furthermore, dust and particulate matter in the flue gas easily accumulate inside the preheater, impairing heat exchange and potentially causing equipment failure and safety hazards. Therefore, developing a cross-flow boiler air preheater that offers efficient heat exchange and is easy to clean and maintain is crucial for improving boiler operating efficiency and extending equipment life. Utility Model Content

[0004] The purpose of the present invention is to provide a high-efficiency air preheater for a through-flow boiler, so as to solve the problem that the traditional air preheater proposed in the above background technology has deficiencies in structural design and heat exchange efficiency, which often leads to insufficient heat exchange between flue gas and air, affecting the overall thermal efficiency of the boiler.

[0005] To achieve the above-mentioned purpose, the present invention provides a high-efficiency air preheater for a through-flow boiler, comprising a shell, a flue gas inlet being provided on one side of the bottom of the shell, a flue gas outlet being provided on the top of the shell, a plurality of heat exchange smoke pipes being vertically installed inside the shell, tube sheets being installed inside the shell near the upper and lower ends of the heat exchange smoke pipes, a cold air inlet being provided on one side of the upper portion of the shell, and a hot air outlet being provided on one side of the lower portion of the shell.

[0006] Preferably, the upper end of the heat exchange smoke pipe passes through the tube plate and is connected to the smoke outlet, and the lower end of the heat exchange smoke pipe passes through the tube plate and is connected to the smoke inlet.

[0007] Preferably, a dust collecting box is installed at the bottom of the shell.

[0008] Preferably, the cold air inlet is located below the upper tube plate of the heat exchange tube, and the hot air outlet is located above the lower tube plate of the heat exchange tube.

[0009] Preferably, a plurality of air folding plates are installed between the upper and lower tube sheets inside the shell, and the air folding plates are staggered up and down to form a serpentine heat exchange channel.

[0010] Preferably, a soot blowing port is provided on one side of the upper portion of the shell, and a soot cleaning port is provided on one side of the lower portion of the shell.

[0011] Preferably, the soot blowing port is located at the upper part of the upper tube plate of the heat exchange flue, and the soot cleaning port is located at the lower part of the lower tube plate of the heat exchange flue.

[0012] Preferably, the heat exchange smoke pipes are evenly arranged inside the shell.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This high-efficiency air preheater for a through-flow boiler achieves significant technical results through optimized structural design and improved heat exchange efficiency. Specifically, the preheater utilizes vertically arranged heat exchange flue tubes, combined with tube sheets at the upper and lower ends, to form a highly efficient heat exchange channel. Furthermore, the provision of air deflectors further enhances the heat exchange between flue gas and air, improving thermal energy utilization. Furthermore, the rational layout of the cold air inlet and hot air outlet ensures sufficient air flow and heat exchange within the preheater, further enhancing its performance.

[0015] More importantly, this utility model also considers the convenience of dust cleaning and maintenance. By providing dust blowing and cleaning ports at the top and bottom of the housing, as well as a dust collection box at the bottom, dust and particulate matter inside the preheater can be easily removed, preventing dust accumulation from affecting heat exchange efficiency and extending the service life of the equipment. In summary, the high-efficiency air preheater for cross-flow boilers of this utility model offers the advantages of efficient heat exchange and easy dust cleaning and maintenance, significantly improving the operating efficiency and thermal energy utilization of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 This is a side structural diagram of the present utility model;

[0018] Figure 3 This is a schematic diagram of the top structure of the utility model;

[0019] Figure 4 This is a schematic structural diagram of the utility model's folded air plate;

[0020] The meaning of each number in the figure is:

[0021] 1. Shell; 11. Flue gas inlet; 12. Flue gas outlet; 13. Soot cleaning port; 14. Soot blowing port; 15. Cold air inlet; 16. Hot air outlet; 2. Heat exchange smoke pipe; 3. Tube sheet; 4. Air deflection plate; 5. Dust collection box. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The utility model provides a high-efficiency air preheater for a through-flow boiler, such as Figures 1-4 As shown, the preheater comprises a shell 1, with a flue gas inlet 11 provided on one side of the bottom of the shell 1, a flue gas outlet 12 provided on the top of the shell 1, and several heat exchange smoke tubes 2 vertically installed inside the shell 1. Tube sheets 3 are installed inside the shell 1 near the upper and lower ends of the heat exchange smoke tubes 2. A cold air inlet 15 is provided on one side of the upper portion of the shell 1, and a hot air outlet 16 is provided on one side of the lower portion of the shell 1. This preheater cleverly arranges several heat exchange smoke tubes 2 vertically inside the shell 1. These smoke tubes form an efficient smoke channel between the smoke inlet 11 and the smoke outlet 12, ensuring smooth flow of smoke and sufficient heat exchange. At the same time, the tube sheets 3 installed at the upper and lower ends of the shell 1 not only provide stable support for the heat exchange smoke tubes 2, but also effectively guide the flow paths of the smoke and air, further improving the heat exchange efficiency.

[0024] In addition, the cold air inlet 15 arranged at the upper part of the shell 1 and the hot air outlet 16 arranged at the lower part form a reasonable air flow channel, so that the cold air can fully enter the interior of the preheater, and after heat exchange with the flue gas in the heat exchange smoke pipe 2, it becomes hot air and is discharged from the hot air outlet 16, thereby achieving efficient preheating of the air.

[0025] In this embodiment, the upper end of the heat exchange flue 2 passes through the tube sheet 3 and communicates with the flue gas outlet 12, while the lower end of the heat exchange flue 2 passes through the tube sheet 3 and communicates with the flue gas inlet 11. This design ensures that flue gas can smoothly enter the heat exchange flue 2 from the flue gas inlet 11 and, after sufficient heat exchange, be discharged from the flue gas outlet 12. This straight-through design reduces flue gas flow resistance, increases flue gas circulation velocity, and thus enhances heat exchange efficiency.

[0026] Specifically, a dust box 5 is mounted at the bottom of the housing 1. This effectively collects dust and particulate matter separated from the flue gas, preventing these impurities from accumulating within the preheater, thereby avoiding blockage of the heat exchange flue duct 2 and a decrease in heat exchange efficiency. Furthermore, the dust box 5 facilitates regular cleaning, maintaining a clean and efficient preheater.

[0027] Furthermore, the cold air inlet 15 is located below the upper tube sheet 3 of the heat exchange flue 2, and the hot air outlet 16 is located above the lower tube sheet 3 of the heat exchange flue 2. The cold air inlet 15 located below the upper tube sheet 3 of the heat exchange flue 2 allows the cold air to be blown directly into the hotter portion of the heat exchange flue 2, improving heat exchange efficiency. The hot air outlet 16 located above the lower tube sheet 3 of the heat exchange flue 2 ensures that the hot air, which has undergone sufficient heat exchange, can be smoothly discharged from the preheater for use in the boiler.

[0028] Furthermore, several deflection plates 4 are installed within the shell 1, between the upper and lower tube sheets 3. These plates are staggered vertically to form a serpentine heat exchange channel. This staggered arrangement creates a complex, serpentine flow path for the flue gas and air within the preheater, increasing the contact time and area between the flue gas and air, thereby improving heat exchange efficiency. Furthermore, the deflection plates 4 guide the airflow, ensuring uniform distribution and stable flow.

[0029] Furthermore, a soot blowing port 14 is provided on one side of the upper portion of the shell 1, and a soot cleaning port 13 is provided on one side of the lower portion of the shell 1. The soot blowing port 14 and the soot cleaning port 13 facilitate regular soot blowing and cleaning operations inside the preheater, keeping the preheater clean and running efficiently.

[0030] Furthermore, the soot blowing port 14 is located above the upper tube sheet 3 of the heat exchange flue 2, and the soot cleaning port 13 is located below the lower tube sheet 3 of the heat exchange flue 2. The soot blowing port 14 is located above the upper tube sheet 3 of the heat exchange flue 2 to facilitate blowing away the soot accumulated thereon; the soot cleaning port 13 is located below the lower tube sheet 3 of the heat exchange flue 2 to facilitate cleaning the soot and debris accumulated thereon.

[0031] Furthermore, the heat exchange tubes 2 are evenly arranged within the housing 1. This uniform arrangement ensures even distribution and sufficient contact between flue gas and air within the preheater, preventing local overheating and insufficient heat exchange. Furthermore, the even arrangement of the heat exchange tubes 2 improves the overall structural strength and stability of the preheater.

[0032] During operation, the high-efficiency through-flow boiler air preheater of this utility model first enters the preheater through the flue gas inlet 11 at the bottom of the housing 1. The flue gas then flows through the vertically arranged heat exchange flue tubes 2 within the housing 1, forming a highly efficient flue gas passage between the flue gas inlet 11 and the flue gas outlet 12. As the flue gas flows through the heat exchange flue tubes 2, it exchanges heat with the cold air entering through the cold air inlet 15, transferring heat to the air. The flue gas, having undergone sufficient heat exchange, is then discharged through the flue gas outlet 12 at the top of the housing 1.

[0033] Cold air enters the preheater through the cold air inlet 15 at the top of the housing 1. Inside the preheater, the cold air exchanges heat with the flue gas in the heat exchange flue duct 2, absorbing the heat from the flue gas and converting it into hot air. The hot air is then discharged through the hot air outlet 16 at the bottom of the housing 1 for use by the boiler.

[0034] As the flue gas flows, some dust and particulate matter is captured by the walls of the heat exchange flue duct 2 and flows down the duct wall into the dust box 5 at the bottom of the housing 1. The dust box 5 effectively collects this dust and particulate matter, preventing it from accumulating inside the preheater. Regular soot blowing and cleaning operations are performed inside the preheater through the soot blowing port 14 at the top and the soot cleaning port 13 at the bottom of the housing 1 to maintain cleanliness and efficient operation.

[0035] The tube sheets 3 mounted at the upper and lower ends of the shell 1 not only provide stable support for the heat exchange smoke pipes 2 but also effectively guide the flow paths of the flue gas and air. The staggered deflector plates 4 installed within the shell 1 form a serpentine heat exchange channel, increasing the contact time and area between the flue gas and air. The deflector plates 4 also guide the airflow, ensuring uniform distribution and stable flow, thereby improving heat exchange efficiency.

[0036] The heat exchange tubes 2 are evenly arranged inside the shell 1, ensuring that the flue gas and air are evenly distributed and fully contacted inside the preheater. The even arrangement of the heat exchange tubes 2 also improves the overall structural strength and stability of the preheater, ensuring long-term stable operation of the preheater.

[0037] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency air preheater for a through-flow boiler, comprising a shell (1), characterized in that: A flue gas inlet (11) is provided on one side of the bottom of the shell (1), a flue gas outlet (12) is provided on the top of the shell (1), a plurality of heat exchange smoke pipes (2) are vertically installed inside the shell (1), tube sheets (3) are installed near the upper and lower ends of the heat exchange smoke pipes (2) inside the shell (1), a cold air inlet (15) is provided on one side of the upper portion of the shell (1), and a hot air outlet (16) is provided on one side of the lower portion of the shell (1); A dust collecting box (5) is installed at the bottom of the housing (1); A plurality of air folding plates (4) are installed between the upper and lower tube sheets (3) inside the shell (1), and the air folding plates (4) are staggered up and down to form a serpentine heat exchange channel; A soot blowing port (14) is provided on one side of the upper portion of the shell (1), and a soot cleaning port (13) is provided on one side of the lower portion of the shell (1).

2. The high-efficiency air preheater for a through-flow boiler according to claim 1, characterized in that: The upper end of the heat exchange smoke pipe (2) passes through the tube plate (3) and is connected to the smoke outlet (12), and the lower end of the heat exchange smoke pipe (2) passes through the tube plate (3) and is connected to the smoke inlet (11).

3. The high-efficiency air preheater for a through-flow boiler according to claim 1, characterized in that: The cold air inlet (15) is located below the upper tube plate (3) of the heat exchange smoke tube (2), and the hot air outlet (16) is located above the lower tube plate (3) of the heat exchange smoke tube (2).

4. The high-efficiency air preheater for a through-flow boiler according to claim 1, characterized in that: The soot blowing port (14) is located at the upper portion of the upper tube plate (3) of the heat exchange flue (2), and the soot cleaning port (13) is located at the lower portion of the lower tube plate (3) of the heat exchange flue (2).

5. The high-efficiency air preheater for a through-flow boiler according to claim 1, characterized in that: The heat exchange smoke tubes (2) are evenly arranged inside the shell (1).

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