Tail gas recovery device for dry ice production

Abstract

The utility model discloses a kind of tail gas recovery devices for preparing dry ice, it is related to tail gas recovery technical field, including box, recycling mechanism, preparation cylinder, connecting cover, telescopic cylinder, gas collection cover, elastic limiting assembly and scraper, the top of connecting cover is communicated with recycling mechanism by telescopic connecting component, the inside of telescopic connecting component is equipped with filter screen, the top of gas collection cover is equipped with knocking filter screen knock piece.The utility model in, set floating type gas collection cover and knock piece, can shake off and block in filter screen mesh and adhere to the dry ice snowflake on the surface of net, dry ice particle is automatically dropped under the action of gravity, solve the problem of filter screen blockage due to dry ice adhesion, guarantee the sustained smooth of tail gas recovery channel, by setting scraper in the bottom of floating type gas collection cover, make it in the process of reciprocating motion up and down to carry out tail gas collection, synchronously complete the scraping of dry ice adhered to the inner wall of preparation cylinder, realize the simultaneous cleaning of cylinder wall and filter screen.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas recovery technology, and in particular to an exhaust gas recovery device for dry ice preparation. Background Technology

[0002] During the dry ice preparation process, the high-pressure liquid carbon dioxide is depressurized to form a gas-solid mixture. The solid part is dry ice, while the gaseous part (carbon dioxide tail gas) will cause waste of raw materials and environmental pollution if it is directly emitted. Therefore, recycling and liquefying the tail gas is the key to improving economic and environmental benefits.

[0003] In the prior art, such as in publication number CN219209344U, a dry ice preparation exhaust gas recovery device is provided. The left wall of the cam cavity has a movable cavity with an opening to the right. While extracting the dry ice exhaust gas in the preparation cavity, the movable rod can be moved up and down to remove the snowflakes attached to the filter plate, thereby improving the recovery efficiency and service life. However, the method of removing snowflakes from the filter plate by moving the movable rod up and down is difficult to remove snowflakes from the holes of the filter plate, and the cleaning effect is limited. Summary of the Invention

[0004] The purpose of this invention is to provide a waste gas recovery device for dry ice preparation in order to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a waste gas recovery device for dry ice preparation, comprising a housing and a recovery and circulation mechanism. The housing contains a preparation cylinder, and the preparation cylinder contains a connecting cover. The top of the preparation cylinder is provided with a telescopic cylinder for driving the connecting cover. The bottom of the connecting cover is provided with a gas collecting cover. The gas collecting cover and the connecting cover are connected by an elastic limiting component. The bottom of the gas collecting cover is connected with a scraper that fits against the inner wall of the preparation cylinder. The top of the connecting cover is connected to the recovery and circulation mechanism through a telescopic connecting component. The telescopic connecting component contains a filter screen, and the top of the gas collecting cover is provided with a striking element for striking the filter screen.

[0006] Preferably, the recycling mechanism includes a compressor and a condenser disposed in the housing, and the preparation cylinder, compressor and condenser are connected in sequence by a circulation pipe to form a loop.

[0007] Preferably, a feed pipe is installed on the outside of the box, the end of the feed pipe extending into the preparation cylinder is inclined downwards, and a nozzle is provided at the end.

[0008] Preferably, the telescopic connection assembly includes a telescopic tube and a detachable connection tube. The detachable connection tube consists of a first connection tube and a second connection tube. The bottom of the first connection tube is provided with a threaded cylinder that is threadedly connected to the second connection tube. The inner walls of the first connection tube and the second connection tube are both fitted with sealing rings, and the filter screen is confined between the two sealing rings.

[0009] Preferably, a telescopic cylinder is connected between the top of the gas collecting hood and the second connecting pipe. The telescopic cylinder is located outside the striking element and is composed of an outer cylinder and an inner cylinder.

[0010] Preferably, the striking element includes a cross-shaped base mounted on the top of the gas collection hood, with a plurality of support rods mounted on the top of the base, and a rubber ball mounted on the top of each support rod.

[0011] Preferably, the elastic limiting component includes a plug rod and a spring. The plug rod is installed on the outside of the gas collection hood, with its upper end passing through the connecting cover. The two ends of the spring abut against the connecting cover and the gas collection hood, respectively.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. In this application, a floating gas collection hood and a striking component are provided. When the telescopic cylinder drives the gas collection hood to descend to the bottom of the preparation cylinder, the gas collection hood is mechanically limited and generates an upward relative displacement, thereby driving the striking component to strike the filter screen, shaking off the dry ice snowflakes that are blocking the filter screen mesh and adhering to the screen surface. The shaken-off dry ice particles automatically fall off under the action of gravity, thereby solving the problem of filter screen clogging caused by dry ice adhesion and ensuring the continuous unobstructed flow of the exhaust gas recovery channel.

[0013] 2. In this application, by setting a scraper at the bottom of the floating gas collection hood, the dry ice adhering to the inner wall of the preparation cylinder is scraped off simultaneously during the process of collecting exhaust gas by reciprocating up and down. This achieves simultaneous cleaning of the cylinder wall and filter screen, simplifies the device structure, reduces equipment manufacturing costs and operating energy consumption, and achieves a balance between high-efficiency recovery and low-cost maintenance. Attached Figure Description

[0014] Figure 1 A schematic diagram of the overall structure according to an embodiment of the present utility model is shown; Figure 2 A cross-sectional view of the overall structure provided according to an embodiment of the present utility model is shown; Figure 3 A cross-sectional view of the internal structure of the preparation cylinder according to an embodiment of the present invention is shown; Figure 4 A cross-sectional view of the internal structure of the connecting cover and the gas collecting cover according to an embodiment of the present invention is shown; Figure 5An enlarged view of the striking element and telescopic cylinder structure provided according to an embodiment of the present invention is shown; Figure 6 The present invention provides an embodiment of the present invention. Figure 4 Enlarged view of the structure at point A in the middle; Figure 7 An enlarged cross-sectional view of the scraper provided according to an embodiment of the present invention is shown.

[0015] Legend: 1. Box body; 101. Recycling mechanism; 2. Preparation cylinder; 201. Cylinder body; 202. Cylinder cover; 203. Connecting component one; 3. Feed pipe; 4. Circulation pipe; 5. Compressor; 6. Condenser; 7. Telescopic cylinder; 8. Connecting cover; 9. Elastic limit component; 901. Insert rod; 902. Spring; 10. Gas collection cover; 11. Scraper; 1101. Mounting part; 1102. Inclined part; 1103. Connecting component two; 12. Telescopic connecting component; 1201. Telescopic pipe; 1202. Detachable connecting pipe; 13. Filter screen; 14. Telescopic cylinder; 1401. Outer cylinder; 1402. Inner cylinder; 15. Striking component; 1501. Base; 1502. Support rod; 1503. Rubber ball; 16. Connecting pipe one; 1601. Threaded cylinder; 17. Connecting pipe two; 18. Sealing ring. Detailed Implementation

[0016] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-3 This utility model provides a technical solution: a tail gas recovery device for dry ice preparation, including a box 1 and a recovery and circulation mechanism 101. The box 1 is provided with a preparation cylinder 2 inside. The recovery and circulation mechanism 101 includes a compressor 5 and a condenser 6 installed in the box 1. The preparation cylinder 2, the compressor 5 and the condenser 6 are connected in sequence by a circulation pipe 4 to form a loop. A feed pipe 3 is installed on the outside of the box 1. One end of the feed pipe 3 extends into the preparation cylinder 2 and is inclined downward, and a nozzle is provided at the end. The preparation cylinder 2 consists of a cylinder body 201 and a cylinder cover 202. The cylinder body 201 and the cylinder cover 202 are connected by a connecting component 203, which enables the subsequent replacement of internal components of the preparation cylinder 2. A conical discharge port is provided at the bottom of the cylinder body 201, which extends out of the bottom of the box 1 to discharge the prepared dry ice. Specifically, such as Figure 3 , Figure 4 and Figure 7 As shown, the preparation cylinder 2 has a connecting cover 8 inside, a telescopic cylinder 7 for driving the connecting cover 8 at the top of the preparation cylinder 2, and a gas collecting cover 10 at the bottom of the connecting cover 8. The gas collecting cover 10 and the connecting cover 8 are connected by an elastic limiting component 9. The elastic limiting component 9 includes a rod 901 and a spring 902. The rod 901 is installed on the outside of the gas collecting cover 10, and its upper end passes through the connecting cover 8. The two ends of the spring 902 abut against the connecting cover 8 and the gas collecting cover 10 respectively. A scraper 11 that fits against the inner wall of the preparation cylinder 2 is connected to the bottom of the gas collecting cover 10. The rod 901 limits the gas collecting cover 10 to slide only vertically, so that the scraper 11 fits against the inner wall of the preparation cylinder 2. The spring 902 makes the gas collecting cover 10 and the connecting cover 8 form an elastic connection. The scraper 11 is integrally composed of a mounting part 1101 and an inclined part 1102. The mounting part 1101 is annular and fits the bottom of the gas collection hood 10, and is connected to the gas collection hood 10 through a connecting component 1103. The inclined part 1102 has a V-shaped cross section. Its inclined surface can generate a component force on the attached dry ice during the scraping process, which guides the dry ice towards the center of the preparation cylinder 2, thereby effectively reducing the residue of dry ice between the scraper 11 and the cylinder wall and ensuring thorough scraping.

[0018] Specifically, such as Figure 4 and Figure 6 As shown, the top of the connecting cover 8 is connected to the recycling mechanism 101 via a telescopic connecting assembly 12. The telescopic connecting assembly 12 has a filter screen 13 inside. The telescopic connecting assembly 12 includes a telescopic tube 1201 and a detachable connecting tube 1202. The detachable connecting tube 1202 is composed of a first connecting tube 16 and a second connecting tube 17. The bottom of the first connecting tube 16 is provided with a threaded cylinder 1601 that is threadedly connected to the second connecting tube 17. The inner walls of the first connecting tube 16 and the second connecting tube 17 are both fitted with sealing rings 18. The filter screen 13 is limited between the two sealing rings 18. The telescopic tube 1201 is made of telescopic tube material and can move up and down with the connecting cover 8 to achieve constant connection with the recycling tube 4. The design of the first connecting tube 16 and the second connecting tube 17 makes it easy to disassemble the filter screen 13 and replace it. In order to avoid gaps between the filter screen 13 and the first connecting tube 16 or the second connecting tube 17 when the filter screen 13 is struck, sealing rings 18 are provided at the gaps to seal them.

[0019] Specifically, such as Figure 4 and Figure 5As shown, the top of the gas collection hood 10 is provided with a striking element 15 for striking the filter screen 13. The striking element 15 includes a cross-shaped base 1501 installed on the top of the gas collection hood 10. Multiple support rods 1502 are installed on the top of the base 1501, and rubber balls 1503 are installed on the top of the support rods 1502. The cross-shaped base 1501 and support rods 1502 provide a mounting position for the rubber balls 1503 while ensuring that gas recovery is not affected. The rubber balls 1503 are made of highly elastic rubber material. Their function is to strike the filter screen 13 upward when the gas collection hood 10 moves to a specific position. The elastic deformation of the rubber balls generates a flexible and impactful force, which effectively shakes off the attached objects and avoids the rigid parts from cutting or permanently damaging the filter screen 13. The spherical rubber material also reduces the frictional resistance with the filter screen 13.

[0020] Specifically, such as Figure 4 and Figure 5 As shown, a telescopic cylinder 14 is connected between the top of the gas collection hood 10 and the connecting pipe 2 17. The telescopic cylinder 14 is located outside the striking member 15. The telescopic cylinder 14 is composed of an outer cylinder 1401 and an inner cylinder 1402. The outer cylinder 1401 and the inner cylinder 1402 serve to ensure that the gas collection hood 10 is always in communication with the connecting pipe 2 17 during the process of the gas collection hood 10 floating up and down under pressure, so that the exhaust gas collected inside the gas collection hood 10 can directly enter the connecting pipe 2 17.

[0021] In summary, the working principle of the dry ice preparation tail gas recovery device provided in this embodiment is as follows: High-pressure liquid carbon dioxide is injected into the preparation cylinder 2 through the nozzle at the end of the inclined feed pipe 3. The liquid carbon dioxide expands rapidly in the preparation cylinder 2 due to the sudden drop in pressure. Part of it solidifies to form dry ice, and the other part is transformed into low-temperature carbon dioxide tail gas. The exhaust gas first enters the telescopic cylinder 14 through the gas collection hood 10, and then passes upward through the telescopic connection assembly 12. During this process, solid impurities such as dry ice microcrystals in the exhaust gas are effectively intercepted by the filter screen 13, and are initially purified. The purified gas flows through the telescopic pipe 1201 and enters the circulation pipe 4. Then it passes through the compressor 5 and the condenser 6 in sequence. In the compressor 5, it is compressed into high temperature and high pressure gas, and then cooled and liquefied by the condenser 6, turning back into liquid carbon dioxide. Finally, this liquid carbon dioxide flows back to the feed pipe 3 through the circulation pipe 4, completing a recycling cycle. During cleaning, the telescopic cylinder 7 is activated, which drives the connecting cover 8 to move downward. Through the connection of the elastic limiting component 9, the gas collecting cover 10 and the scraper 11 at its bottom also move downward. The scraper 11 scrapes off the dry ice layer that is firmly attached to the inner wall of the preparation cylinder 2, achieving preliminary cleaning. When the gas collecting cover 10 moves to the bottom of its stroke, due to the mechanical limiting at the bottom of the cylinder 201, the gas collecting cover 10 will have a slight upward displacement relative to the connecting cover 8, compressing the spring 902. This action directly drives the striking part 15 installed on the top of the gas collecting cover 10 to move upward. The rubber ball 1503 on its top strikes the filter screen 13 with a flexible impact force, causing the dry ice powder blocked in the mesh to loosen and fall off due to the violent vibration, and fall back to the bottom of the preparation cylinder 2 under the action of gravity.

[0022] The above description of the embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for recovering exhaust gas from dry ice production, comprising a housing (1) and a recovery and circulation mechanism (101), characterized in that, The box (1) is equipped with a preparation cylinder (2) inside. The preparation cylinder (2) is equipped with a connecting cover (8) inside. The top of the preparation cylinder (2) is equipped with a telescopic cylinder (7) for driving the connecting cover (8). The bottom of the connecting cover (8) is equipped with a gas collecting cover (10). The gas collecting cover (10) and the connecting cover (8) are connected by an elastic limiting component (9). The bottom of the gas collecting cover (10) is connected with a scraper (11) that fits against the inner wall of the preparation cylinder (2). The top of the connecting cover (8) is connected to the recycling mechanism (101) through a telescopic connecting component (12). The telescopic connecting component (12) is equipped with a filter screen (13) inside. The top of the gas collecting cover (10) is equipped with a striking component (15) for striking the filter screen (13).

2. The tail gas recovery device for dry ice preparation according to claim 1, characterized in that, The recycling mechanism (101) includes a compressor (5) and a condenser (6) installed in the housing (1). The preparation cylinder (2), compressor (5) and condenser (6) are connected in sequence by a circulation pipe (4) to form a loop.

3. The tail gas recovery device for dry ice preparation according to claim 1, characterized in that, The outer side of the box (1) is equipped with a feed pipe (3), the feed pipe (3) extends into the preparation cylinder (2) at one end and is inclined downward, and the end is provided with a nozzle.

4. The tail gas recovery device for dry ice preparation according to claim 1, characterized in that, The telescopic connection assembly (12) includes a telescopic tube (1201) and a detachable connection tube (1202). The detachable connection tube (1202) is composed of a first connection tube (16) and a second connection tube (17). The bottom of the first connection tube (16) is provided with a threaded cylinder (1601) that is threadedly connected to the second connection tube (17). The inner walls of the first connection tube (16) and the second connection tube (17) are both embedded with sealing rings (18). The filter screen (13) is limited between the two sealing rings (18).

5. The tail gas recovery device for dry ice preparation according to claim 4, characterized in that, A telescopic cylinder (14) is connected between the top of the gas collection hood (10) and the connecting pipe two (17). The telescopic cylinder (14) is located outside the striking part (15). The telescopic cylinder (14) is composed of an outer cylinder (1401) and an inner cylinder (1402).

6. The tail gas recovery device for dry ice preparation according to claim 1, characterized in that, The striking element (15) includes a cross-shaped base (1501) mounted on the top of the gas collection hood (10), a plurality of support rods (1502) mounted on the top of the base (1501), and a rubber ball (1503) mounted on the top of the support rods (1502).

7. The tail gas recovery device for dry ice preparation according to claim 1, characterized in that, The elastic limiting component (9) includes a plug (901) and a spring (902). The plug (901) is installed on the outside of the gas collection hood (10), and its upper end passes through the connecting cover (8). The two ends of the spring (902) abut against the connecting cover (8) and the gas collection hood (10) respectively.

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