An air preheater

Abstract

The application discloses an air preheater which can be directly connected at the position of the air inlet pipe of a boiler, can finely divide the incoming air and improve the heat exchange efficiency, and is characterized in that a main pipe body is divided into upper and lower parts, the upper part of the main pipe body is a straight square pipe, the lower part of the main pipe body is a square pipe, the cross-sectional area of the lower part of the main pipe body gradually increases from top to bottom, a limiting ring is arranged on the inner wall of the lower part of the main pipe body, a fan holder is arranged in the main pipe body, the fan holder is divided into upper, middle and lower sections, the cross-sectional areas of the outer walls of the three sections gradually increase from top to bottom, a plurality of heating rings are equidistantly arranged on the middle section of the fan holder in a circumferential direction, a plurality of partition plates are arranged on the fan holder in a circumferential direction, and the partition plates are correspondingly attached to the inner wall of the main pipe body.

Description

Technical Field

[0001] This invention relates to an air preheater, a device for preheating air introduced into an industrial boiler, belonging to the field of industrial boilers. Specifically, it relates to a device that can be directly connected to the boiler's air inlet pipe and can refine and distribute the incoming air to improve heat exchange efficiency. Background Technology

[0002] Currently, in industrial boilers, preheating is required to raise the temperature of the atmosphere inside the boiler, reducing the high energy consumption and other problems caused by rapid temperature changes associated with direct heating. Existing preheaters are used for preheating the air inside the furnace. The basic structure of a preheater is to use the temperature of the flue gas generated by combustion to act in the furnace, accelerating the rise of the atmosphere inside the furnace. However, the external air enters the furnace by being drawn in by a fan, and the airflow cannot be dispersed, so it cannot fully exchange heat with the flue gas. It is only a single flue gas heat exchange. In order to achieve sufficient heat exchange, the pipe length needs to be extended to increase the heat exchange stroke. This results in poor stability, a complex overall structure, and an inability to achieve effective air preheating.

[0003] Publication number CN210921478U discloses an environmentally friendly and efficient rotary air preheater, including: a support bearing, the support bearing supporting a central cylinder, a rotor fixed outside the central cylinder, the support bearing being fixed to a cold end central truss, the rotor being a circular structure formed by 48 rotor compartments, a partition being provided inside the rotor compartment to divide the cavity outside the rotor compartment into two symmetrical parts, and the cold end central truss being a variable cross-section fish-belly beam structure composed of an upper wing plate, two side wing plates and a lower wing plate. This device has a complex structure and a large volume, and cannot be directly adapted to existing pipe structures, especially boiler air inlet pipes. Summary of the Invention

[0004] To improve the above situation, the present invention provides an air preheater that can be directly connected to the inlet of a boiler and can refine and divert the incoming air to improve heat exchange efficiency.

[0005] The air preheater of the present invention is implemented as follows: The air preheater of the present invention consists of a main body, a fan holder, partitions, heating rings, a fan, and a limiting ring. The main body is divided into upper and lower parts. The upper part of the main body is a rectangular tube, and the lower part of the main body is a square tube, with the cross-sectional area gradually increasing from top to bottom. The limiting ring is placed on the inner wall of the lower part of the main body. The fan holder is placed inside the main body. The fan holder is divided into upper, middle, and lower sections, with the cross-sectional area of ​​the outer wall of the three sections increasing sequentially from top to bottom. Multiple heating rings are circumferentially and equidistantly placed on the middle section of the fan holder. Multiple partitions are circumferentially placed on the fan holder. The partitions and the inner wall of the main body are correspondingly fitted. The partitions are made of aluminum alloy. The fan is placed inside the lower section of the fan holder.

[0006] Beneficial effects.

[0007] 1. It can be directly connected to the boiler air inlet.

[0008] Second, it can refine and divert the incoming air, thereby improving heat exchange efficiency.

[0009] Third, it has a built-in preheating structure to compensate for the instability of flue gas heating. Attached Figure Description

[0010] Figure 1 A three-dimensional structural diagram of an air preheater according to the present invention;

[0011] Figure 2 A three-dimensional structural diagram of a fan holder for an air preheater according to the present invention;

[0012] Figure 3 A top view of an air preheater according to the present invention;

[0013] Figure 4 A schematic diagram of the structure of an air preheater according to the present invention.

[0014] In the attached diagram

[0015] The components are: main body (1), fan retainer (2), partition (3), heating ring (4), fan (5), and limit ring (6). Detailed implementation method:

[0016] The air preheater of the present invention is implemented as follows: The air preheater of the present invention consists of a main body (1), a fan (5), a retainer (2), a partition (3), a heating ring (4), a fan (5), and a limiting ring (6). The main body (1) is divided into upper and lower parts. The upper part of the main body (1) is a rectangular tube, and the lower part of the main body (1) is a square tube, with the cross-sectional area gradually increasing from top to bottom. The limiting ring (6) is placed on the inner wall of the lower part of the main body (1). The fan (5) retains... The holder (2) is placed inside the main tube. The fan (5) holder (2) is divided into three sections: upper, middle and lower. The cross-sectional area of ​​the outer wall of the three sections increases from top to bottom. Multiple heating rings (4) are circumferentially and equidistantly placed on the middle section of the fan (5) holder (2). Multiple partitions (3) are circumferentially placed on the fan (5) holder (2). The partitions (3) and the inner wall of the main tube (1) are correspondingly attached. The partitions (3) are made of aluminum alloy. The fan (5) is placed in the lower section of the fan (5) holder (2).

[0017] When in use, connect the imported structure to the existing boiler air inlet, start the fan (5), the fan (5) draws the outside air into the main body (1), multiple baffles (3) cut and refine the airflow into multiple groups, at the same time the heating ring (4) is connected to the external power supply to generate heat, the baffles (3) conduct the heat of the heating ring (4) to heat multiple groups of airflow, the heat exchange efficiency is high, and the heated airflow enters the boiler from the main body (1) to complete the preheating of the boiler air;

[0018] The lower part of the main tube (1) is a square tube, and the cross-sectional area gradually increases from top to bottom. This design can guide and concentrate the air entering from the outside, increase the airflow velocity, avoid backflow, and has a good air introduction effect.

[0019] The fan (5) retainer (2) is divided into three sections: upper, middle and lower. The cross-sectional area of ​​the outer wall of the three sections increases from top to bottom. This design can match the shape of the main body (1) and ensure a uniform and stable connection of the partition (3).

[0020] The partition (3) is made of aluminum alloy, which has a small structural mass and good thermal conductivity, thus improving heat exchange efficiency.

[0021] The design of multiple baffles (3) circumferentially placed on the fan (5) holder (2) can cut and refine the airflow, thereby improving the heat exchange efficiency;

[0022] The design of the heating ring (4) in conjunction with the partition (3) can preheat the incoming airflow and make up for the instability of flue gas heating;

[0023] The design of the partition (3) to conduct heat from the heating ring (4) enables heating of multiple airflows with high heat exchange efficiency. The heated airflow enters the boiler from the main body (1) to preheat the boiler air.

[0024] The goal is to achieve a direct connection to the boiler's air inlet, and to refine and divert the incoming air to improve heat exchange efficiency.

[0025] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any person skilled in the art can make some modifications without departing from the scope of the present invention; that is, all equivalent modifications made in accordance with the present invention should be covered by the scope of the present invention.

[0026] It should be further noted that, in order to keep the description simple and clear, the above specific embodiments only describe the differences between them and other embodiments. However, those skilled in the art should know that the above specific embodiments are also independent technical solutions.

Claims

1. An air preheater, characterized in that: The main body is divided into upper and lower parts. The upper part of the main body is a rectangular tube, and the lower part of the main body is a square tube, with the cross-sectional area gradually increasing from top to bottom. A limiting ring is placed on the inner wall of the lower part of the main body. A fan retainer is placed inside the main body. The fan retainer is divided into upper, middle and lower sections, with the outer wall cross-sectional area of ​​the three sections increasing sequentially from top to bottom. Multiple heating rings are circumferentially and equidistantly placed on the middle section of the fan retainer. Multiple partitions are circumferentially placed on the fan retainer. The partitions are correspondingly fitted to the inner wall of the main body. The fan is placed inside the lower section of the fan retainer. In use, it is connected to the existing boiler air inlet.

2. An air preheater according to claim 1, characterized in that... The lower part of the main body is a square tube with a cross-sectional area that gradually increases from top to bottom. This design can guide and concentrate incoming air and increase airflow velocity, preventing backflow.

3. An air preheater according to claim 1, characterized in that... The fan retainer is divided into three sections: upper, middle, and lower. The cross-sectional area of ​​the outer wall of the three sections increases sequentially from top to bottom. This design can match the shape of the main body and ensure a uniform and stable connection of the partition.

4. An air preheater according to claim 1, characterized in that... The design of multiple baffles circumferentially placed on the fan retainer can cut, refine and split the airflow.

5. An air preheater according to claim 1, characterized in that... The design of the heating ring in conjunction with the baffle plate can preheat the incoming airflow and compensate for the instability of flue gas heating.

6. An air preheater according to claim 1, characterized in that... The baffle conducts heat from the heating ring, enabling the heating of multiple airflows. The heated airflow then enters the boiler from the main pipe to preheat the boiler air.

7. An air preheater according to claim 1, characterized in that... The partition is made of aluminum alloy.

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