Pyrolysis gas dehydration system in tetrafluoroethylene production

Abstract

The utility model discloses a pyrolysis gas dehydration system in tetrafluoroethylene production, which belongs to the technical field of tetrafluoroethylene production, and adopts the technical scheme that the pyrolysis gas dehydration system comprises a spraying system and a filtering system, the spraying system is connected with a gas inlet pipeline, a gas outlet pipeline and an acid inlet pipeline, the gas outlet pipeline is communicated with the filtering system, and the acid inlet pipeline is communicated with the filtering system. The filtering system comprises two sulfuric acid demisters, the two sulfuric acid demisters are connected in series through a communicating pipe, the two sulfuric acid demisters are both connected with the acid inlet pipeline, an output pipeline is arranged at the end, away from the spraying system, of the sulfuric acid demister, and filtering pieces are arranged in the two sulfuric acid demisters. The device can be used for completely removing acid mist without shutdown maintenance, so that the demisting effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tetrafluoroethylene production, in particular to a cracking gas dehydration system in tetrafluoroethylene production. Background Art

[0002] In tetrafluoroethylene (PTFE) production, water is a critical safety control parameter. Therefore, to reduce the water content in cracked gas (PTFE) without compromising product quality, 98% concentrated sulfuric acid is used for dehydration. However, since the cracked gas (PTFE) carries acid mist after being sprayed with sulfuric acid, traditional cracked gas (PTFE) filtration uses a wire mesh demister to remove the acid mist. However, this method still allows a small amount of acid mist to enter the downstream system, leading to frequent compressor maintenance and equipment corrosion. Therefore, a cracked gas dehydration system for tetrafluoroethylene production is needed. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of the utility model is to provide a cracking gas dehydration system in tetrafluoroethylene production, which can completely remove acid mist without stopping the machine for maintenance, thereby improving the demisting effect.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions: a cracking gas dehydration system in tetrafluoroethylene production, comprising a spraying system and a filtering system, wherein the spraying system is connected to an air inlet pipe, an air outlet pipe and an acid inlet pipe, the air outlet pipe is communicated with the filtering system, the filtering system comprises two sulfuric acid defoamers, the two sulfuric acid defoamers are connected in series through a connecting pipe, the two sulfuric acid defoamers are both connected to the acid inlet pipe, an output pipe is provided at one end of the sulfuric acid defoamer away from the spraying system, and filter elements are provided inside the two sulfuric acid defoamers.

[0005] In some embodiments, both of the sulfuric acid defoamers further include a top cover and a liquid sealing cup, one side of the top cover is connected to the connecting pipe, and the other side is connected to an air outlet, the liquid sealing cup is filled with sulfuric acid, the filter element is located between the top cover and the liquid sealing cup, and the liquid sealing cup is connected to the acid inlet pipe.

[0006] In some embodiments, a differential pressure gauge is provided on each of the two sulfuric acid defoamers.

[0007] In some embodiments, the filter element includes a filter core, an extension core and a shielding cover. An isolation ring is provided between the filter core and the extension core. The isolation ring and the shielding cover form a closed space. The shielding cover is fixedly connected to the top cover, and the shielding cover is connected to the inner wall of the sulfuric acid defoamer through threads.

[0008] In some embodiments, the shielding cover includes a connecting edge and a covering area, a surface of the connecting edge is provided with threads, and the covering area is in contact with the extended core.

[0009] In some embodiments, the filter element and the extension core are both made of carbon fiber and glass fiber.

[0010] In summary, the present invention has the following beneficial effects:

[0011] The utility model is provided with two sulfuric acid demisters, which not only increase the filtration path and can completely separate the cracking gas and the acid mist, thereby improving the acid mist removal effect, but also can perform maintenance without stopping the machine when inspecting, repairing and replacing the filter element of a single sulfuric acid demister, and the operation is simple and convenient, thereby ensuring the demisting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the sulfuric acid defoamer of the utility model;

[0014] Figure 3 This is a partial structural sectional view of the sulfuric acid defoamer of the utility model;

[0015] Figure 4 This is a schematic diagram of the working structure of the sulfuric acid defoamer of the utility model.

[0016] In the figure: 1. Spray system; 2. Filtration system; 21. Sulfuric acid demister; 22. Top cover; 23. Liquid seal cup; 24. Filter element; 241. Filter element; 242. Extension core; 243. Isolation ring; 244. Shielding cover; 2441. Connecting edge; 2442. Covering area; 25. Air outlet; 3. Connecting pipe; 4. Air inlet pipe; 5. Acid inlet pipe; 6. Output pipe; 7. Air outlet pipe. DETAILED DESCRIPTION

[0017] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0019] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0020] See also Figure 1-4 A cracked gas dehydration system for tetrafluoroethylene production includes a spray system 1 and a filter system 2. The spray system 1 is connected to an air inlet pipe 4, an air outlet pipe 7, and an acid inlet pipe 5. The air outlet pipe 7 is connected to the filter system 2. The filter system 2 includes two sulfuric acid demisters 21, which are connected in series via a connecting pipe 3. Both sulfuric acid demisters 21 are connected to the acid inlet pipe 5. An output pipe 6 is provided at one end of the sulfuric acid demister 21 away from the spray system 1. Filter elements 24 are provided inside both sulfuric acid demisters 21. During use, an operator introduces cracked gas, which is tetrafluoroethylene, into the spray system 1. After the cracked gas passes through the spray system 1 and is sprayed with sulfuric acid, a small amount of acid mist entrained therein enters the filter system 2 through the air outlet pipe 7. The gas is then passed through the two sulfuric acid demisters 21 in sequence, completely separated from the acid mist, and then discharged through the output pipe 6. The acid mist is then collected by the sulfuric acid demisters 21, transported through the acid inlet pipe 5, and then transported to the spray system 1 via an external delivery pump for reuse.

[0021] In some embodiments, both the outlet pipe 7 and the connecting pipe 3 are provided with branch pipes, which are interconnected and connected to the output pipe 6. When maintenance is required on the two sulfuric acid defoamers 21, the operator can control the opening and closing of the outlet pipe 7 and the branch pipes of the connecting pipe 3 through valves on the pipes, thereby achieving the effect of operating a single sulfuric acid defoamer 21 without stopping the machine for maintenance. Controlling the opening and closing of the pipes by valves on the pipes is a prior art and will not be elaborated on here.

[0022] In some embodiments, the two sulfuric acid defoamers 21 also include a top cover 22 and a liquid seal cup 23. One side of the top cover 22 is connected to the connecting pipe 3, and the other side is connected to the air outlet 25. The liquid seal cup 23 is filled with sulfuric acid. The filter element 24 is located between the top cover 22 and the liquid seal cup 23. The liquid seal cup 23 is connected to the acid inlet pipe 5. The filter element 24 includes a filter element 241, an extension core 242 and a shielding cover 244. An isolation ring 243 is provided between the filter element 241 and the extension core 242. The filter element 241 is connected to the isolation ring 243 by bolts, the isolation ring 243 is welded to the sulfuric acid defoamer 21, the isolation ring 243 and the shielding cover 244 form a closed space, the shielding cover 244 is fixedly connected to the top cover 22, the shielding cover 244 is connected to the inner wall of the sulfuric acid defoamer 21 by threads, the shielding cover 244 includes a connecting edge 2441 and a covering area 2442, the surface of the connecting edge 2441 is provided with threads, and the covering area 2442 is in contact with the extended core 242. When the operator needs to extend the filtering path of the sulfuric acid defoamer 21, the operator can rotate the top cover 22, and the top cover 22 drives the shielding cover 244 to rotate, so that the top cover 22 and the shielding cover 244 move upward in the sulfuric acid defoamer 21. During the movement, the shielding cover 244 gradually moves away from the isolation ring 243 and the cracking gas in the sulfuric acid defoamer 21 is blocked by the shielding cover 244 and will not leak out. As the shielding cover 244 moves, the extension core 242 in the shielding area 2442 is exposed, thereby extending the filtering path of the filter element 24 in the sulfuric acid defoamer 21. Finally, after the gas enters the sulfuric acid defoamer 21, it is filtered by the filter elements 241 and the extension core 242 in the two sulfuric acid defoamers 21, and the acid mist is completely removed, thereby improving the acid mist removal effect.

[0023] In some embodiments, a differential pressure gauge is provided on each of the two sulfuric acid defoamers 21. An operator can promptly determine the acid mist removal efficiency of the sulfuric acid defoamers 21 by using the pressure differential of the remote differential pressure gauge. This determination is based on the operator's technical experience and is a routine procedure for those skilled in the art, and will not be elaborated on herein.

[0024] In some embodiments, both the filter element 241 and the extension core 242 are made of a combination of carbon fiber and glass fiber. Carbon fiber is lightweight, high-strength, and rigid, while glass fiber offers the advantage of good toughness. Combining the two maximizes the strength and rigidity of carbon fiber while leveraging the toughness of glass fiber to enhance the overall strength and durability of the filter element 241 and the extension core 242.

[0025] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A cracking gas dehydration system for tetrafluoroethylene production, characterized by: The invention comprises a spraying system (1) and a filtering system (2), wherein the spraying system (1) is connected to an air inlet pipe (4), an air outlet pipe (7) and an acid inlet pipe (5), wherein the air outlet pipe (7) is communicated with the filtering system (2), and the filtering system (2) comprises two sulfuric acid defoamers (21), wherein the two sulfuric acid defoamers (21) are connected in series via a connecting pipe (3), and the two sulfuric acid defoamers (21) are both connected to the acid inlet pipe (5), and an output pipe (6) is provided at one end of the sulfuric acid defoamer (21) away from the spraying system (1), and a filter element (24) is provided inside the two sulfuric acid defoamers (21).

2. The cracked gas dehydration system for tetrafluoroethylene production according to claim 1, characterized in that: The two sulfuric acid defoamers (21) each further include a top cover (22) and a liquid seal cup (23). One side of the top cover (22) is connected to the connecting pipe (3), and the other side is connected to an air outlet (25). Sulfuric acid is contained in the liquid seal cup (23). The filter element (24) is located between the top cover (22) and the liquid seal cup (23). The liquid seal cup (23) is connected to the acid inlet pipe (5).

3. The system for dehydrating cracked gas in tetrafluoroethylene production according to claim 1, characterized in that: The two sulfuric acid defoamers (21) are both provided with a differential pressure gauge.

4. The system for dehydrating cracked gas in tetrafluoroethylene production according to claim 2, characterized in that: The filter element (24) comprises a filter element (241), an extension core (242) and a shielding cover (244); an isolation ring (243) is provided between the filter element (241) and the extension core (242); the isolation ring (243) and the shielding cover (244) form a closed space; the shielding cover (244) is fixedly connected to the top cover (22); and the shielding cover (244) is connected to the inner wall of the sulfuric acid defoamer (21) via a threaded connection.

5. A cracked gas dehydration system for tetrafluoroethylene production according to claim 4, characterized in that: The shielding cover (244) comprises a connecting edge (2441) and a covering area (2442); a surface of the connecting edge (2441) is provided with threads, and the covering area (2442) is in contact with the extended core (242).

6. The system for dehydrating cracked gas in tetrafluoroethylene production according to claim 4, characterized in that: The filter core (241) and the extension core (242) are both made of carbon fiber and glass fiber.

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