Efficient anti-corrosion gas preheater

Abstract

The efficient anti-corrosion gas preheater comprises an outer shell and a heating assembly, the outer shell is of a cylinder structure with an opening in the bottom end, heat preservation materials are filled between the heating assembly and the outer shell, and the heating assembly comprises a heating pipeline and a fin heater. The heating pipeline is formed by connecting three vertically-arranged U-shaped pipelines, an air inlet is horizontally formed in one end of the heating pipeline, an air outlet is horizontally formed in the other end of the heating pipeline, and the fin heater is vertically inserted into the heating pipeline from bottom to top and fixedly connected with the heating pipeline. According to the utility model, the problem that the pipeline is blocked due to dust deposition can be avoided, and the pipeline can be synchronously prevented from being corroded by acid gas.

Description

Technical Field

[0001] This utility model relates to the field of gas heating technology, and in particular to a high-efficiency corrosion-resistant gas preheater. Background Technology

[0002] Gas heating can be categorized into combustion and electric heating, with electric heaters becoming the mainstream due to increasingly stringent environmental regulations. Electric heaters primarily heat gas by passing electricity through resistance wires, converting electrical energy into heat energy. Most commercially available electric air heaters are box-type structures. For example, patent 202121850395.6 discloses an air heater based on electric heating rods, which heats air by installing multiple electric heating rods inside the outer casing. However, this box-type structure is prone to dust accumulation inside, which is extremely difficult to remove. Prolonged dust accumulation can cause channel blockage, and the dust can also act as insulation between the gas and the pipe wall, lowering the wall temperature. If the heated gas contains corrosive gases such as sulfur dioxide, dew point corrosion can occur, where sulfur-containing gases condense into sulfuric acid or sulfurous acid solutions due to the low wall temperature, causing irreversible corrosion to the inner wall. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-efficiency anti-corrosion gas preheater to solve the problem that existing heaters are prone to dust accumulation and corrosion in the channel, and cannot heat corrosive gases.

[0004] The purpose of this utility model is achieved through the following technical solution: a high-efficiency corrosion-resistant gas preheater, including a shell and a heating component. The shell is a cylindrical structure with an open bottom. The space between the heating component and the shell is filled with insulation material. The heating component includes a heating pipe and a finned heater. The heating pipe is formed by connecting three vertically arranged U-shaped pipes. One end of the heating pipe has a horizontally arranged air inlet, and the other end of the heating pipe has a horizontally arranged exhaust outlet. The finned heater is vertically inserted into the heating pipe from bottom to top and is fixedly connected to the heating pipe.

[0005] Furthermore, the finned heater includes a heating tube with an internal resistance heating element and spiral heat sink fins surrounding the outer surface of the heating tube.

[0006] Furthermore, the maximum radial dimension of the spiral heat sink is equal to the diameter of the inner wall of the heating pipe.

[0007] Furthermore, it also includes a fixing component, which includes an upper support plate, a support column, and a lower support plate. One end of the support column is fixedly connected to the upper support plate, and the lower end of the support column is fixedly connected to the lower support plate. The heating pipe passes through the upper support plate and extends between the upper support plate and the lower support plate.

[0008] Furthermore, a thermocouple placement pipe is provided inside the outer casing, and the thermocouple placement pipe is located between the heating pipes.

[0009] Furthermore, the insulation material is alumina insulation cotton.

[0010] This utility model has the following advantages:

[0011] 1. By setting up an inverted U-shaped heating pipe structure, and by ensuring the connection method and sealing of the pipe, dust can be prevented from accumulating inside the pipe due to gravity, thus avoiding pipe blockage and preventing pipe corrosion. This is one of the reasons why the preheater can heat corrosive gases.

[0012] 2. The heating pipe is equipped with a finned heater with spiral heat dissipation fins. Because the spiral heat dissipation fins greatly increase the heat dissipation area, the finned heater has a higher heating efficiency than the ordinary bare rod heater. The finned heater can also better fill the heating pipe, allowing the heated gas to fully contact the finned heater, further improving the heating efficiency. Sufficient heating and no dust accumulation prevent the pipe from experiencing "dew point corrosion" when heating corrosive gases.

[0013] 3. The arrangement of thermocouples also allows users to better understand the temperature of the heated gas, facilitating timely adjustments by personnel;

[0014] 4. An outer shell is installed around the heating component, and alumina insulation cotton is arranged between the outer shell and the heating pipe. This not only improves the safety performance of the gas heater, but also further reduces heat loss and improves heating efficiency.

[0015] 5. The overall structure is simple, the strength is not easily deformed, it is dustproof and corrosion-resistant, the heating efficiency is high, it is easy to disassemble and install, and it has the excellent feature of real-time temperature measurement and control. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the preheater of this utility model;

[0017] Figure 2 yes Figure 1 A schematic diagram of the structure after removing the outer shell and insulation material;

[0018] Figure 3 yes Figure 2 Another structural diagram of the preheater;

[0019] Figure 4 yes Figure 1 Cross-sectional view of the preheater;

[0020] Figure 5 This is a cross-sectional view of the finned heater in the preheater.

[0021] In the diagram, 1 is the outer casing; 2 is the air inlet; 3 is the heating pipe; 4 is the thermocouple placement pipe; 5 is the connecting pipe; 6 is the exhaust port; 7 is the finned heater; 8 is the upper support plate; 9 is the support column; 10 is the lower support plate; 11 is the spiral heat sink; and 12 is the cover. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] like Figure 1 As shown, a high-efficiency corrosion-resistant gas preheater includes a shell 1, a heating component, and a fixing component. The shell 1 is a cylindrical structure with an open bottom. The heating component is located inside the shell 1. Alumina insulation cotton is filled between the heating component and the shell 1 as insulation material, which can reduce heat loss and is beneficial to energy conservation and environmental protection.

[0026] like Figure 2 , Figure 3As shown, the heating assembly includes a heating pipe 3 and a finned heater 7. The heating pipe 3 consists of two inverted U-shaped tubes and a horizontally arranged connecting pipe 5 that connects the two inverted U-shaped tubes. The heating pipe 3 is vertically arranged, with an air inlet 2 horizontally arranged at one end and an exhaust port 6 horizontally arranged at the other end. Gas enters from the air inlet 2, passes through three connected U-shaped tubes in sequence, and then exits from the exhaust port 6. Both the air inlet 2 and the exhaust port 3 are located at the lower part of the heating pipe 3, which avoids the problem of dust accumulating inside the entire heating pipe 3 due to gravity, thus achieving the purpose of dust prevention.

[0027] like Figure 5 As shown, the finned heater 7 includes a heating tube with an internal resistance heating element and spiral heat dissipation fins 11 surrounding the outer surface of the heating tube. One end of the heating tube is fitted with a cap 12, such as... Figure 4 As shown, four finned heaters 7 are arranged inside the heating pipe 3. The finned heaters 7 are vertically inserted into the heating pipe 3 from bottom to top and are bolted to the heating pipe 3 through the cover 12. The installation of the spiral heat sink 11 on the heating pipe helps to improve the heat exchange efficiency of the gas.

[0028] The maximum radial dimension of the spiral heat sink 11 is equal to the diameter of the inner wall of the heating pipe 3, so that when the heated gas passes through the heating pipe 3, it can only pass through the gap between the spiral heat sink 11 on the finned heater 7 and the inner wall of the heating pipe 3. This allows the gas to fully contact the finned heater 7 and makes the gas heat up evenly.

[0029] To further improve its structural strength, the entire preheater structure is made of stainless steel, and a fixing assembly is installed below the heating pipe 3. The fixing assembly includes an upper support plate 8, a lower support plate 10, and four support columns 9. One end of the support column 9 is fixedly connected to the upper support plate 8, and the lower end of the support column 9 is fixedly connected to the lower support plate 10. The heating pipe 3 passes through the upper support plate 8 and extends between the upper support plate 8 and the lower support plate 10. The support columns 9 are evenly distributed around the heating pipe 3 to prevent the heating pipe from deforming due to prolonged heating.

[0030] Thermocouple placement pipe 4 is installed inside the outer casing 1. Thermocouple placement pipe 4 is located between heating pipes 3. The installation opening of thermocouple placement pipe 4 faces downward. Thermocouple is built into thermocouple placement pipe 4. Thermocouple can be used to measure and control the temperature of the gas inside heating pipe 3, so that the user can keep track of the actual temperature of the heated gas at any time, making it convenient to make adjustments, and also ensuring the safety performance of the entire preheater.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency corrosion-resistant gas preheater, characterized in that: The device includes a shell (1) and a heating assembly. The shell (1) is a cylindrical structure with an open bottom. The space between the heating assembly and the shell (1) is filled with insulation material. The heating assembly includes a heating pipe (3) and a finned heater (7). The heating pipe (3) is formed by connecting three vertically arranged U-shaped pipes. One end of the heating pipe (3) is horizontally provided with an air inlet (2), and the other end of the heating pipe (3) is horizontally provided with an exhaust port (6). The finned heater (7) is vertically inserted into the heating pipe (3) from bottom to top and is fixedly connected to the heating pipe (3).

2. The high-efficiency corrosion-resistant gas preheater according to claim 1, characterized in that: The finned heater (7) includes a heating tube with an internal resistance heating element and a spiral heat sink (11) surrounding the outer surface of the heating tube.

3. The high-efficiency corrosion-resistant gas preheater according to claim 2, characterized in that: The maximum radial dimension of the spiral heat sink (11) is equal to the diameter of the inner wall of the heating pipe (3).

4. The high-efficiency corrosion-resistant gas preheater according to claim 1, characterized in that: It also includes a fixing component, which includes an upper support plate (8), a support column (9), and a lower support plate (10). One end of the support column (9) is fixedly connected to the upper support plate (8), and the lower end of the support column (9) is fixedly connected to the lower support plate (10). The heating pipe (3) passes through the upper support plate (8) and extends between the upper support plate (8) and the lower support plate (10).

5. The high-efficiency corrosion-resistant gas preheater according to claim 1, characterized in that: Thermocouple placement pipe (4) is provided inside the outer shell (1), and the thermocouple placement pipe (4) is located between the heating pipes (3).

6. The high-efficiency corrosion-resistant gas preheater according to claim 1, characterized in that: The insulation material is alumina insulation cotton.

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