Hydrochloric acid tail gas absorption device

Abstract

The utility model provides a hydrochloric acid tail gas absorption device which comprises a tank body used for containing absorption liquid, a siphon buffer cover and a pressing plate, the pressing plate is located between the tank body and the siphon buffer cover, the tank body, the siphon buffer cover and the pressing plate are connected in a sealed mode, a hydrochloric acid tail gas inlet is formed in the top of the siphon buffer cover, and a liquid outlet is formed in the bottom of the tank body. A gas outlet and a liquid adding opening are formed in the positions, close to the upper end, of the tank body, a gas guide pipe is arranged in the tank body and used for guiding hydrochloric acid tail gas into absorption liquid in the tank body, and an opening in the upper end of the gas guide pipe is fixedly formed in the pressing plate and communicated with the siphon buffer cover. During use, hydrochloric acid tail gas firstly enters the siphon buffer cover and then is guided into the absorption liquid through the gas guide pipe, so that siphonage caused by pressure change in the process that the hydrochloric acid tail gas is absorbed by the absorption liquid is avoided. The hydrochloric acid tail gas absorption device is simple in structure, low in manufacturing cost, low in use cost and good in hydrochloric acid tail gas absorption effect.

Description

Technical Field

[0001] The utility model relates to a hydrochloric acid tail gas absorption device. Background Art

[0002] Chemical production, especially the production and storage of acid reagents, often produces hydrochloric acid offgas (i.e., offgas containing hydrogen chloride gas). This offgas can cause acid rain, polluting the environment and harming human health. Therefore, national regulations require that hydrochloric acid offgas be treated and released only after it meets emission standards. Traditionally, hydrochloric acid offgas is treated by a fan, which propels the offgas into a spray tower. There, it comes into contact with an alkaline solution, absorbing the hydrogen chloride gas in the offgas.

[0003] To ensure efficient hydrochloric acid tail gas absorption, conventional hydrochloric acid tail gas absorption devices typically require a motor to atomize the absorption liquid, which is then stirred by a motor to ensure a thorough reaction between the absorption liquid and the hydrochloric acid tail gas. For example, prior art CN216024072U discloses a hydrochloric acid tail gas absorption device employing this method. Such a device is inherently complex in structure, resulting in high manufacturing costs. Furthermore, the motor must operate continuously during the hydrochloric acid tail gas absorption process, consuming a significant amount of energy.

[0004] In addition, the existing hydrochloric acid tail gas absorption device generally introduces the hydrochloric acid tail gas directly into the absorption part of the absorption device through the air inlet pipe. During the absorption process of the tail gas containing hydrochloric acid, the air inlet pipe is prone to form a negative pressure, thereby causing a siphon phenomenon. The siphon phenomenon can easily cause the absorption liquid to flow back into the reactor and contaminate the reactants.

[0005] Therefore, the art needs a low-cost, low-energy-consumption, and siphon-free hydrochloric acid tail gas absorption device to reduce the cost of the absorption device and ensure the safety of chemical product production. Utility Model Content

[0006] In response to the problems existing in existing hydrochloric acid tail gas absorption devices and their use, the purpose of this utility model is to provide a novel hydrochloric acid tail gas absorption device, which has a simple structure, low manufacturing cost, low energy consumption during use, no siphoning phenomenon, and is safe to use. To achieve the purpose of this utility model, the following technical solutions are adopted:

[0007] A hydrochloric acid tail gas absorption device comprises a tank body for containing absorption liquid, a siphon buffer cover and a pressure plate.

[0008] The pressing plate is provided with a central hole,

[0009] The pressure plate is located between the tank body and the siphon buffer cover, and the three are sealed and connected.

[0010] The top of the siphon buffer cover is provided with an air inlet for hydrochloric acid tail gas.

[0011] The bottom of the tank is provided with a drain port.

[0012] The tank body is also provided with an air outlet and a liquid filling port.

[0013] An air guide pipe is provided inside the tank body for introducing hydrochloric acid tail gas into the absorption liquid in the tank body. The upper end opening of the air guide pipe is fixedly installed in the central hole and is connected to the siphon buffer cover.

[0014] In another preferred embodiment, the siphon buffer cover is composed of an upper cover and a cylindrical body of the siphon buffer cover, and the upper cover and the cylindrical body of the siphon buffer cover can be integrally formed or sealed together to form the siphon buffer cover.

[0015] In another preferred embodiment, the volume of the siphon buffer cover is 1 / 4 to 2 / 3 of the volume of the tank body.

[0016] In another preferred embodiment, the tank body is composed of a pot-shaped bottom and a cylindrical main body of the tank body, and the two can be integrally formed or sealed together to form the tank body, and the air outlet and liquid filling port are arranged at the upper end of the cylindrical main body of the tank body.

[0017] In another preferred example, an upper deflector plate and a lower deflector plate are further provided inside the tank body, one end of the upper deflector plate is fixedly mounted on the outer wall of the air guide tube, and the other end is a free end, and the free end (the free end of the upper deflector plate) is spaced a distance from the inner wall of the tank body, and one end of the lower deflector plate is fixedly mounted on the inner wall of the cylindrical main body of the tank body, and the other end is a free end, and the free end (the free end of the lower deflector plate) is spaced a distance from the outer wall of the air guide tube.

[0018] In another preferred example, the distance between the upper deflector plate and the liquid filling port is 1 / 3 to 1 / 2 of the height of the cylindrical main body of the tank body, and the distance between the upper deflector plate and the lower deflector plate is 1 / 3 to 1 / 5 of the height of the cylindrical main body of the tank body.

[0019] In another preferred example, the distance between the free end of the upper deflector plate and the inner wall of the cylindrical main body of the tank body is 1 / 3 to 1 / 6 of the radius of the cylindrical main body of the tank body, and the distance between the free end of the lower deflector plate and the outer wall of the air guide tube is 1 / 3 to 1 / 6 of the radius of the cylindrical main body of the tank body.

[0020] In another preferred embodiment, the tank body is further provided with a first liquid level gauge port and a second liquid level gauge port, which are used to install the upper port and the lower port of the liquid level gauge respectively, so that the liquid level gauge is communicated with the interior (fluid) of the tank body.

[0021] In another preferred embodiment, a gas distributor is installed at the lower end of the air guide tube, and the gas distributor allows the gas in the air guide tube to be evenly dispersed into the absorption liquid.

[0022] In another preferred example, the upper end opening of the cylindrical main body of the tank body is provided with an outwardly protruding edge, the lower end opening of the cylindrical main body of the siphon buffer cover is provided with an outwardly protruding edge, the pressure plate is provided with an outwardly extending edge, and the tank body, the siphon buffer cover and the pressure plate are fixedly connected together by their edges.

[0023] Compared with the prior art, the simple hydrochloric acid tail gas absorption device of the utility model has the following advantages:

[0024] Beneficial effects:

[0025] 1. The hydrochloric acid tail gas absorption device of the present invention is provided with a siphon buffer cover, which effectively solves the siphon phenomenon caused by pressure changes during the absorption of hydrogen chloride gas by the absorption liquid, and is safe to use.

[0026] 2. The hydrochloric acid tail gas absorption device of the present invention has a simple structure and does not require a motor to stir the reaction liquid. The hydrogen chloride gas in the hydrochloric acid tail gas can be fully absorbed only by the upper and lower flow-removing plates provided in the tank body 1 containing the reaction liquid. Such an absorption device has low manufacturing cost and low energy consumption during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0028] Figure 1 A front view of a hydrochloric acid tail gas absorption device according to a specific embodiment of the present invention is shown;

[0029] Figure 2 Shows Figure 1 A cross-sectional view of the hydrochloric acid tail gas absorption device along its central axis;

[0030] Figure 3 A top view of the platen is shown.

[0031] Figure 1-3In the middle, 1 is the tank body, 2 is the siphon buffer cover, 3 is the pressure plate, 11 is the pot-shaped bottom, 12 is the cylindrical body of the tank body, 11a is the liquid discharge port, 12a is the air outlet, 12b is the liquid filling port, 12c is the first liquid level gauge port, 12d is the second liquid level gauge port, 121 is the liquid level gauge, 13 is the air guide pipe, 14 is the upper flow-disconnecting plate, 15 is the lower flow-disconnecting plate, 16 is the gas distributor, 21 is the upper cover of the siphon buffer cover, 22 is the cylindrical body of the siphon buffer cover, 2a is the air inlet, 31 is the center hole, and AA' is the center axis of the tank body. DETAILED DESCRIPTION

[0032] In the description of this utility model, directional words such as "upper" and "lower" are understood in accordance with the conventional way in the field.

[0033] In order to facilitate the understanding of the present invention, the present invention will be described in more comprehensive and detailed manner below in conjunction with the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.

[0034] like Figure 1 The hydrochloric acid tail gas absorption device of a specific embodiment of the present invention shown includes a tank body 1 and a siphon buffer cover 2. The tank body 1 is used to hold the absorption liquid, and the siphon buffer cover 2 is placed above the tank body 1. A pressure plate 3 is disposed between the tank body 1 and the siphon buffer cover 2. The pressure plate 3 is sealed to the tank body 1 and the siphon buffer cover 2. For example, sealing rings are provided between the pressure plate 3 and the tank body 1, and between the pressure plate 3 and the siphon buffer cover 2, respectively, to maintain a sealed connection between them.

[0035] The siphon buffer cover 2 consists of an upper cover 21 and a cylindrical main body 22. These two components can be integrally formed or sealed together to form the siphon buffer cover 2. The volume of the siphon buffer cover 2 is 1 / 4 to 2 / 3 the volume of the tank body 1. An inlet 2a for the hydrochloric acid tail gas is located at the top of the upper cover 21.

[0036] The tank body 1 consists of a pot-shaped bottom 11 and a cylindrical main body 12. These can be formed integrally or separately. During use, the two parts are sealed together to form the tank body 1. A drain port 11a is provided at the bottom of the pot-shaped portion 11 for discharging waste absorption liquid. Near the top of the cylindrical main body 12 are an air outlet 12a (for exhausting exhaust gas from removing hydrogen chloride gas) and a liquid inlet 12b (for adding and replenishing absorption liquid).

[0037] A central hole 31 for mounting the air guide tube 13 is provided at the center of the pressing plate 3 .

[0038] like Figure 2As shown, the air duct 13 is arranged inside the tank body 1, and is used to guide the hydrochloric acid tail gas into the absorption liquid in the tank body 1. The air duct 13 is located at the central axis of the hydrochloric acid tail gas absorption device, and its upper end is fixedly mounted in the central hole 31 of the pressure plate 3, and is connected to the siphon buffer cover 2. A gas distributor 16 is installed at the lower end of the air duct 13. After the hydrochloric acid tail gas is dispersed by the gas distributor 16, it contacts the absorption liquid in the tank body 1 and is then absorbed. The gas distributor 16 is a gas distributor commonly used in the art, and is provided with evenly distributed small holes, which are used to make the hydrochloric acid tail gas in the air duct 13 evenly dispersed and contact the absorption liquid. The gas distributor 16 is preferably located at the horizontal plane where the cylindrical main body 12 of the tank body is connected to the pot-shaped bottom 11.

[0039] An upper splitter plate 14 and a lower splitter plate 15 are further provided inside the tank body 1. The upper splitter plate 14 is located above the lower splitter plate 15, and the distance between the upper splitter plate 14 and the liquid filling port 12b is 1 / 3 to 1 / 2 of the height of the cylindrical main body of the tank body 1, and the distance between the upper splitter plate 14 and the lower splitter plate 15 is 1 / 3 to 1 / 5 of the height of the cylindrical main body of the tank body 1.

[0040] One end of the upper deflector plate 14 is fixedly mounted on the outer wall of the air duct 13, and the other end is free. The free end is spaced a distance from the inner wall of the cylindrical body of the tank 1. For example, the distance between the free end of the upper deflector plate 14 and the inner wall of the cylindrical body of the tank is 1 / 3 to 1 / 6 of the radius of the cylindrical body. Rising bubbles can continue to rise through the gap between the free end of the upper deflector plate 14 and the inner wall of the cylindrical body. One end of the lower deflector plate 15 is fixedly mounted on the inner wall of the cylindrical body of the tank 1, and the other end is free and spaced a distance from the outer wall of the air duct 13. For example, the distance between the free end of the lower deflector plate 15 and the outer wall of the air duct 13 is 1 / 3 to 1 / 6 of the radius of the cylindrical body of the tank 1. Rising bubbles can continue to rise through the gap between the free end of the lower deflector plate 15 and the outer wall of the air duct 13.

[0041] The cylindrical main body 12 of the tank body 1 is also provided with a first liquid level gauge port 12c and a second liquid level gauge port 12d, which are respectively used to place the upper port and the lower port of the liquid level gauge 121, so that the liquid level gauge 121 is connected to the interior of the tank body 1. The liquid level gauge 121 is made of a transparent material and is used to display the liquid level height in the tank body 1. The user determines the amount of absorption liquid in the tank body 1 by observing the condition of the absorption liquid. The liquid level gauge 121 is arranged parallel to the central axis A-A1' of the hydrochloric acid tail gas absorption device so that the height of the liquid level displayed by it is more accurate. The upper port of the liquid level gauge (121) is located at the upper end of the cylindrical main body 12, below the liquid filling port 12b, and the lower port of the liquid level gauge 121 is located at the lower end of the cylindrical main body 12.

[0042] When using the hydrochloric acid tail gas absorption device of the present invention to absorb hydrochloric acid tail gas, absorption liquid is added to the tank body 1 through the liquid addition port 12b. After the absorption liquid in the tank body 1 reaches a predetermined liquid level as observed by the liquid level gauge 121, the addition of liquid is stopped. The hydrochloric acid tail gas is then passed through the air inlet 21a at the top of the siphon buffer cover 2. The gas passes through the air duct 13 and is dispersed by the gas distributor 16 before evenly entering the absorption liquid (e.g., an alkaline solution) in the tank body 1. The hydrogen chloride gas therein is absorbed by the absorption liquid, and the gas that does not contain hydrogen chloride eventually overflows from the surface of the absorption liquid and is discharged from the gas outlet 12a of the tank body 1. After long-term use, when the absorption liquid no longer has the ability to absorb hydrogen chloride gas, it is discharged through the bottom drain port 11a of the tank body 1.

[0043] After the hydrochloric acid tail gas is discharged from the gas distributor 16 and enters the absorption liquid, most of the hydrogen chloride gas is quickly absorbed by the absorption liquid, and the unabsorbed hydrogen chloride-containing gas rises in the form of bubbles. After the above process, the bubbles are first blocked by the lower deflector plate 15. After the bubbles burst, the hydrogen chloride gas in them is absorbed by the absorption liquid. Newly formed bubbles or unbroken bubbles bypass the lower deflector plate 15 and continue to rise through the gap between the free end of the lower deflector plate 15 and the outer wall of the air guide tube 13. During the rising process, the bubbles are again blocked by the upper deflector plate 14. After the bubbles burst, the hydrogen chloride gas in them is absorbed by the absorption liquid. Newly formed bubbles or unbroken bubbles bypass the upper deflector plate 14 and continue to rise through the gap between the free end of the upper deflector plate 14 and the inner wall of the cylindrical body. In this way, after two rounds of blocking and bursting by the lower deflector plate 15 and the upper deflector plate 14, the residual hydrogen chloride gas in the bubbles generated after the initial absorption of the hydrochloric acid tail gas can be fully absorbed by the absorption liquid, and the gas that ultimately overflows from the absorption liquid is substantially free of hydrogen chloride gas. If it meets national emission standards, it can be discharged directly into the atmosphere or reused through other means.

[0044] Because the siphon buffer cover 2 is relatively large, the gas it contains can be used to balance the negative pressure within the tank 1 generated by the reaction between the hydrogen chloride in the hydrochloric acid offgas and the solution, thereby preventing siphoning. Even if the reaction between the hydrogen chloride and the absorption liquid generates a significant negative pressure, causing the absorption liquid to rise along the air guide 13 into the siphon buffer cover 2, the large volume of the siphon buffer cover 2 will confine the absorption liquid to the siphon buffer cover 2 and make it difficult for it to enter the reaction device generating the hydrochloric acid offgas.

[0045] Although specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications shall fall within the scope of protection of the present invention.

Claims

1. A hydrochloric acid tail gas absorption device, characterized in that: The hydrochloric acid tail gas absorption device comprises a tank body (1) for containing absorption liquid, a siphon buffer cover (2) and a pressing plate (3). The pressing plate (3) is provided with a central hole (31), The pressure plate (3) is located between the tank body (1) and the siphon buffer cover (2), and the three are sealed and connected. The top of the siphon buffer cover (2) is provided with an air inlet (2a) for hydrochloric acid tail gas. The bottom of the tank body (1) is provided with a liquid discharge port (11a). The tank body (1) is also provided with an air outlet (12a) and a liquid filling port (12b). An air guide tube (13) is provided inside the tank body (1) for introducing hydrochloric acid tail gas into the absorption liquid in the tank body (1); the upper end opening of the air guide tube (13) is fixedly mounted in the central hole (31) and communicated with the siphon buffer cover (2).

2. The hydrochloric acid tail gas absorption device according to claim 1, characterized in that: The siphon buffer cover (2) is composed of an upper cover (21) and a cylindrical main body (22) of the siphon buffer cover, and the two are integrally formed or sealed together to form the siphon buffer cover (2).

3. The hydrochloric acid tail gas absorption device according to claim 1 or 2, characterized in that: The volume of the siphon buffer cover (2) is 1 / 4 to 2 / 3 of the volume of the tank body (1).

4. The hydrochloric acid tail gas absorption device according to claim 1 or 2, characterized in that: The tank body (1) is composed of a pot-shaped bottom (11) and a cylindrical tank body (12), and the two are integrally formed or sealed together to form the tank body (1). The air outlet (12a) and the liquid filling port (12b) are arranged at the upper end of the cylindrical main body (12) of the tank.

5. The hydrochloric acid tail gas absorption device according to claim 1 or 2, characterized in that: The tank body (1) is further provided with an upper deflector plate (14) and a lower deflector plate (15). One end of the upper deflector plate (14) is fixedly mounted on the outer wall of the air guide tube (13), and the other end is a free end, and the free end is spaced a distance from the inner wall of the cylindrical main body of the tank body (1). One end of the lower deflector plate (15) is fixedly mounted on the inner wall of the cylindrical main body of the tank (1), and the other end is a free end, which is spaced a distance from the outer wall of the air guide pipe (13).

6. The hydrochloric acid tail gas absorption device according to claim 5, characterized in that: The upper deflector plate (14) is located above the lower deflector plate (15), and the distance between the upper deflector plate (14) and the liquid filling port (12b) is 1 / 3 to 1 / 2 of the height of the cylindrical main body of the tank body (1); and The distance between the upper deflector plate (14) and the lower deflector plate (15) is 1 / 3 to 1 / 5 of the height of the cylindrical main body of the tank body (1).

7. The hydrochloric acid tail gas absorption device according to claim 5, characterized in that: The distance between the free end of the upper splitter plate (14) and the inner wall of the cylindrical main body of the tank body (1) is 1 / 3 to 1 / 6 of the radius of the cylindrical main body of the tank body (1), and The distance between the free end of the lower deflector plate (15) and the outer wall of the air guide pipe (13) is 1 / 3 to 1 / 6 of the radius of the cylindrical main body of the tank body (1).

8. The hydrochloric acid tail gas absorption device according to claim 1 or 2, characterized in that: The tank body (1) is further provided with a first liquid level gauge port (12c) and a second liquid level gauge port (12d), which are respectively used to install the upper port and the lower port of the liquid level gauge (121), so that the liquid level gauge (121) is communicated with the interior of the tank body (1).

9. The hydrochloric acid tail gas absorption device according to claim 1 or 2, characterized in that: A gas distributor (16) is installed at the lower end of the gas guide pipe (13), and the gas distributor (16) allows the gas in the gas guide pipe (13) to enter the absorption liquid in a uniform and dispersed manner.

10. The hydrochloric acid tail gas absorption device according to claim 1 or 2, characterized in that: The upper end opening of the cylindrical main body of the tank (1) is provided with an outwardly protruding edge. The lower end opening of the cylindrical main body of the siphon buffer cover (2) is provided with an outwardly protruding edge. The pressing plate (3) is provided with an edge extending outwards, The tank body (1), the siphon buffer cover (2) and the pressing plate (3) are fixedly connected together via their edges.

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