Exhaust gas heat recovery device

Abstract

This utility model relates to the field of heat recovery technology, specifically a tail gas heat recovery device, comprising: a tank, with a vent pipe and an exhaust pipe respectively connected to the top and bottom of the tank; a gas distribution shell and a gas collection shell respectively fixedly connected to the top and bottom of the tank's inner cavity; and multiple corrugated heat exchange tubes distributed at equal angles connecting the gas distribution shell and the gas collection shell; a tail gas conveying pipe connected to the vent pipe via a flange; and a tail gas transfer pipe connected to the exhaust pipe via a flange. This utility model, by increasing the heat exchange area, allows the water to rotate during its downward flow, thereby improving the stability of heat exchange efficiency. Furthermore, the flowing water minimizes the adhesion of soluble substances decomposed after heating to the inside of the heat exchange equipment, preventing scale formation, thus giving the device excellent heat exchange performance.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery technology, specifically to a tail gas heat recovery device. Background Technology

[0002] A sodium sulfide converter is a piece of equipment used to produce sodium sulfide, primarily in the chemical industry. Its working principle involves heating sodium sulfate (its main component is sodium sulfate) at high temperatures to induce a reduction reaction between sodium sulfate and pulverized coal, producing sodium sulfide. However, the exhaust gas from the converter contains a large amount of heat. If this heat is not properly utilized, it leads to a significant waste of thermal resources, which is inconsistent with sustainable development strategies.

[0003] Currently, common equipment for exhaust gas heat recovery uses heat exchange, which typically uses cold water. However, when cold water comes into contact with heat, it easily releases soluble substances such as bicarbonates and sulfates. These substances decompose and adhere to the inside of the heat exchange equipment, forming scale. This scale can severely affect the heat transfer efficiency of the heat exchanger and may even block the pipes, leading to equipment failure. To address this, we propose an exhaust gas heat recovery device. Utility Model Content

[0004] The purpose of this invention is to provide a tail gas heat recovery device with the advantage of good heat exchange effect. It solves the problem that cold water easily precipitates its own soluble substances after contact with heat, and decomposes and adheres to the inside of the heat exchange equipment to form scale after being heated. This scale will seriously affect the heat transfer efficiency of the heat exchanger and may even block the pipeline, leading to the scrapping of the equipment.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tail gas heat recovery device, comprising:

[0006] The tank body has a vent pipe and an exhaust pipe connected to its top and bottom, respectively. The top and bottom of the tank body are fixedly connected to a gas distribution shell and a gas collection shell, respectively. Multiple corrugated heat exchange tubes with equal angles are connected between the gas distribution shell and the gas collection shell.

[0007] An exhaust gas delivery pipe, wherein the exhaust gas delivery pipe is connected to a vent pipe via a flange;

[0008] The exhaust gas transfer pipe is connected to the exhaust pipe via a flange.

[0009] The upper end of the inner cavity of the tank is provided with a water delivery channel extending to the rear of the tank, and the rear side of the water delivery channel is connected to a cold water delivery pipe; the lower end of the inner cavity of the tank is provided with a drainage channel extending to the front of the tank, and the front of the drainage channel is connected to a hot water recovery pipe.

[0010] Preferably, a guide vane is fixedly connected to the upper end of the inner wall of the tank.

[0011] Preferably, the outer surface of the tank is provided with a sealed inspection door.

[0012] Preferably, two tanks are provided, and the two ends of the vent pipe are respectively connected to the two tanks. The middle part of the vent pipe is connected to the exhaust gas delivery pipe via a T-junction. A first valve body is provided on both sides of the vent pipe and the exhaust gas delivery pipe. The middle part of the exhaust pipe is connected to the exhaust gas transfer pipe via a T-junction. A second valve body is provided on both sides of the exhaust pipe and the exhaust gas transfer pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] By increasing the heat exchange area, this invention enables the water to rotate as it flows from top to bottom, thereby improving the stability of heat exchange efficiency. Furthermore, the flowing water minimizes the accumulation of soluble substances that decompose after heating inside the heat exchange equipment, thus forming scale. This gives the device a high-performance heat exchange capability. Attached Figure Description

[0015] Figure 1 This is a first-view structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the second-view structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the third-view cross-sectional structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the cooperative structure of the corrugated heat exchange tube, the gas distribution shell, and the gas collection shell of this utility model.

[0019] In the diagram: 1. Tank body; 101. Water delivery channel; 102. Cold water delivery pipe; 103. Drainage channel; 104. Hot water recovery pipe; 105. Sealed inspection door; 106. Vent pipe; 107. Exhaust pipe; 2. Tail gas delivery pipe; 201. First valve body; 3. Tail gas transfer pipe; 301. Second valve body; 4. Gas distribution shell; 401. Gas collection shell; 402. Corrugated heat exchanger tube; 403. Guide vane. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The components of this application, including the tank body 1, water delivery channel 101, cold water delivery pipe 102, drainage channel 103, hot water recovery pipe 104, sealed inspection door 105, vent pipe 106, exhaust pipe 107, tail gas delivery pipe 2, first valve body 201, tail gas transfer pipe 3, second valve body 301, gas distribution shell 4, gas collection shell 401, corrugated heat exchange pipe 402, and guide vane 403, are all general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0024] Example 1

[0025] Please see Figures 1-4 As shown, this utility model provides a technical solution: a tail gas heat recovery device, comprising:

[0026] Tank 1, with a vent pipe 106 and an exhaust pipe 107 connected to the top and bottom of the tank 1 respectively. A gas distribution shell 4 and a gas collection shell 401 are fixedly connected to the top and bottom of the inner cavity of the tank 1 respectively. Multiple corrugated heat exchange tubes 402 with equal angles are connected between the gas distribution shell 4 and the gas collection shell 401.

[0027] Exhaust gas delivery pipe 2 is connected to vent pipe 106 via a flange.

[0028] The exhaust gas transfer pipe 3 is connected to the exhaust pipe 107 via a flange.

[0029] The upper end of the inner cavity of the tank 1 is provided with a water delivery channel 101 extending to the rear of the tank 1. The rear side of the water delivery channel 101 is connected to a cold water delivery pipe 102. The lower end of the inner cavity of the tank 1 is provided with a drainage channel 103 extending to the front of the tank 1. The front side of the drainage channel 103 is connected to a hot water recovery pipe 104. The upper end of the inner wall of the tank 1 is fixedly connected with a guide plate 403.

[0030] This technical solution: By setting up the exhaust gas delivery pipe 2, the converter exhaust gas can be sent into the gas distribution shell 4 inside the tank 1 with the assistance of the vent pipe 106. Then, the exhaust gas is dispersed into multiple gas streams that enter the corrugated heat exchange tubes 402, thereby increasing the heat exchange area between the gas and the water and improving the heat exchange efficiency. When the external heat exchange cooling water enters the tank 1 through the cooling water delivery pipe 102 and the water delivery channel 101, it can interact with the multiple corrugated heat exchange tubes 402. Heat exchange is achieved through two-way contact. The drain channel 103 and hot water recovery pipe 104 at the lower end of the tank 1 can recover and guide the water after heat exchange, so that the water flows from top to bottom in the tank 1. Cold water is pressurized and enters the water delivery channel 101, and is guided into the interior of the tank 1. The interior of the tank 1 is cylindrical. The water delivery channel 101 and the drain channel 103 are arranged one after the other, and are coordinated with the guide plate 403. This allows the water to rotate inside the cylindrical tank 1 during heat exchange. Combined with the influence of gravity, this causes secondary flow (such as eddies or spiral mixing) in the radial direction (perpendicular to the main flow direction). This disturbance disrupts the laminar boundary layer on the pipe wall or heat exchange surface, making the heat exchange between the core area of ​​the water and the wall more intense. The laminar boundary layer is the main source of thermal resistance; the thinner it is, the higher the heat transfer efficiency. Secondary flow makes the temperature gradient distribution in the water more uniform, reduces local heat retention, and prolongs the water residence time, increasing the contact area. At the same time, the mixing effect of the rotating flow avoids the formation of local high or low temperature areas due to uneven flow velocity, making the overall temperature field more uniform and improving the stability of heat exchange efficiency. In addition, the flowing water can minimize the adhesion of soluble substances decomposed after heating to the inside of the heat exchange equipment and the formation of scale, giving this device a high heat exchange performance.

[0031] Example 2

[0032] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, a sealed inspection door 105 is provided on the outer surface of the tank body 1.

[0033] This technical solution: By setting up a sealed inspection door 105, it facilitates subsequent cleaning work by staff.

[0034] Example 3

[0035] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, there are two tanks 1. The two ends of the vent pipe 106 are connected to the two tanks 1 respectively. The middle part of the vent pipe 106 is connected to the exhaust gas delivery pipe 2 via a T-connector. A first valve body 201 is provided on both sides of the vent pipe 106 and located on both sides of the exhaust gas delivery pipe 2. The middle part of the exhaust pipe 107 is connected to the exhaust gas transfer pipe 3 via a T-connector. A second valve body 301 is provided on both sides of the exhaust pipe 107 and located on both sides of the exhaust gas transfer pipe 3.

[0036] This technical solution allows for the selection of the tank 1 to be used by setting the first valve body 201 and the second valve body 301 (for example, simultaneously opening the left first valve body 201 and the second valve body 301, and closing the right first valve body 201 and the second valve body 301, thus enabling the left tank 1 to be used). When cleaning is required, one of the tanks 1 can be cleaned without stopping the machine, which is convenient for users.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A tail gas heat recovery device, characterized in that, include: Tank (1), the top and bottom of the tank (1) are respectively connected to a vent pipe (106) and an exhaust pipe (107), the top and bottom of the inner cavity of the tank (1) are respectively fixedly connected to a gas distribution shell cover (4) and a gas collection shell cover (401), and a plurality of corrugated heat exchange tubes (402) distributed at equal angles are connected between the gas distribution shell cover (4) and the gas collection shell cover (401); Exhaust gas delivery pipe (2), which is connected to the vent pipe (106) via a flange; The exhaust gas transfer pipe (3) is connected to the exhaust pipe (107) via a flange.

2. The exhaust gas heat recovery device according to claim 1, characterized in that: The upper end of the inner cavity of the tank (1) is provided with a water delivery channel (101) extending to the rear of the tank (1), and the rear side of the water delivery channel (101) is connected to a cold water delivery pipe (102); the lower end of the inner cavity of the tank (1) is provided with a drainage channel (103) extending to the front of the tank (1), and the front side of the drainage channel (103) is connected to a hot water recovery pipe (104).

3. The exhaust gas heat recovery device according to claim 1, characterized in that: A guide vane (403) is fixedly connected to the upper end of the inner wall of the tank (1).

4. The exhaust gas heat recovery device according to claim 1, characterized in that: The outer surface of the tank (1) is provided with a sealed inspection door (105).

5. The exhaust gas heat recovery device according to claim 1, characterized in that: Two tanks (1) are provided. The two ends of the vent pipe (106) are respectively connected to the two tanks (1). The middle part of the vent pipe (106) is connected to the exhaust gas delivery pipe (2) through a T-connector. A first valve body (201) is provided on the vent pipe (106) and on both sides of the exhaust gas delivery pipe (2). The middle part of the exhaust pipe (107) is connected to the exhaust gas transfer pipe (3) through a T-connector. A second valve body (301) is provided on the exhaust pipe (107) and on both sides of the exhaust gas transfer pipe (3).

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