Stable carbon dioxide conveying device for urea production

Abstract

The utility model discloses a stable carbon dioxide conveying device for urea production, which comprises a header pipe inlet, a header pipe outlet and a device body, the header pipe inlet is arranged on the right side of the device body, and the header pipe outlet is arranged on the left side of the device body; the device body further comprises a pressure stabilizing mechanism, a filtering mechanism and auxiliary mechanisms, the auxiliary mechanisms are arranged between the main pipe inlet and the main pipe outlet, the filtering mechanism is arranged on the left side of the main pipe inlet, the pressure stabilizing mechanism is arranged on the left side of the filtering mechanism, and the pressure stabilizing mechanism, the filtering mechanism and the auxiliary mechanisms are in telecommunication connection with a production workshop control cabinet. According to the utility model, a stable gas conveying function is provided for a system, and the surge phenomenon caused by pressure fluctuation is reduced; the influence of vibration on bolts of the connecting flange is reduced, and the service life of the system is prolonged; scrap iron brought by carbon dioxide gas is filtered, the scrap iron is prevented from corroding the interior of a pipeline in the gas conveying process, and the service life of a conveying system is prolonged.

Description

A stable carbon dioxide conveying device for urea production Technical Field

[0001] This utility model belongs to the technical field of urea production equipment, and in particular relates to a stable carbon dioxide conveying device for urea production. Background Technology

[0002] Urea, a core product in agricultural fertilizers and chemical raw materials, is synthesized through a catalytic reaction between carbon dioxide and ammonia. Under specific temperature and pressure conditions, these two gases react chemically to produce urea; carbon dioxide can also be used as a protective gas to prevent equipment corrosion.

[0003] Existing technologies, such as the carbon dioxide gas delivery system for casting production disclosed in Chinese Patent (CN203868695U), include a central tank and a gas storage tank. The central tank has an inlet main control valve and a delivery main control valve, with the delivery main control valve connected to a regulating valve assembly. The gas storage tank is connected to the regulating valve assembly via a delivery pipeline. Branch control valves are installed on the delivery pipeline. The gas storage tank has multiple gas output ports, which are connected to gas-using equipment at the production site. The carbon dioxide gas delivery system provided by this utility model offers stable pressure supply, can supply gas to multiple work points simultaneously, reduces labor intensity, and meets the carbon dioxide gas delivery requirements for casting molding production.

[0004] This method has the following drawbacks: First, during the urea production process, the addition amount is unstable due to pressure fluctuations and gas volume limitations in the company's main gas pipeline, leading to pressure fluctuations in the inlet pipe and causing a surge phenomenon due to pressure pulsation during carbon dioxide injection. Second, during carbon dioxide transportation, the transportation pipeline experiences mechanical vibrations caused by pressure pulsation, affecting the connection between the pipeline mounting clips and flanges, accelerating bolt fatigue fracture, and increasing system maintenance costs. Third, during the transportation of carbon dioxide in the pipeline, it easily carries rust and other solid impurities. These impurities, along with the gas, impact the pipe wall, causing erosion and wear, accelerating internal wear, and reducing the service life of the transportation system.

[0005] Therefore, this paper provides a stable carbon dioxide delivery device for urea production. Summary of the Invention

[0006] To address the aforementioned technical problems, this utility model discloses a stable carbon dioxide conveying device for urea production, which provides a stable gas conveying function to the system, reduces surge caused by pressure fluctuations during conveying, reduces the impact of vibration on the bolts of the connecting flange, and increases the service life of the system; filters iron filings brought in by carbon dioxide gas at the inlet of the main pipe, preventing iron filings from re-corroding the inside of the pipeline during gas conveying, and increasing the service life of the conveying system.

[0007] To achieve the above-mentioned technical effects, this utility model provides a stable carbon dioxide delivery device for urea production, including a main pipe inlet, a main pipe outlet, and a device body. The main pipe inlet is located on the right side of the device body, and the main pipe outlet is located on the left side of the device body. The device body also includes a pressure stabilizing mechanism, a filtering mechanism, and an auxiliary mechanism. The auxiliary mechanism, which provides buffering and vibration reduction functions, is located between the main pipe inlet and the main pipe outlet. The filtering mechanism for filtering rust impurities is located on the left side of the main pipe inlet. The pressure stabilizing mechanism, the filtering mechanism, and the auxiliary mechanism are all electrically connected to the production workshop control cabinet.

[0008] Preferably, the pressure stabilizing mechanism further includes an air compressor, a pressure stabilizing cylinder, a compressed air inlet pipe, an electric valve a, an electric valve b, and a pressure sensor a. The air compressor is connected to the rear side of the pressure stabilizing cylinder through the compressed air inlet pipe. The pressure stabilizing cylinder is located on the left side of the main pipe inlet. The electric valve a is located on the right side of the pressure stabilizing cylinder, the electric valve b is located on the left side of the pressure stabilizing cylinder, and the pressure sensor a is located above the pressure stabilizing cylinder.

[0009] Preferably, the pressure stabilizing cylinder is further provided with an inner cylinder, a spring, a valve plate, and a support block on the left side inside. The inner cylinder is located on the left side inside the pressure stabilizing cylinder, the spring is located inside the inner cylinder, the valve plate is located on the right side of the spring, the diameter of the valve plate is larger than the diameter of the right inlet of the inner cylinder and smaller than the inner diameter of the inner cylinder, and the support blocks are respectively located on the outside of the valve plate.

[0010] Preferably, the auxiliary mechanism further includes a pressure sensor b, a compensation pipe a, and a compensation pipe b. The pressure sensor b is located to the left of the electric valve b, the compensation pipe b is located to the left of the pressure sensor b, and the compensation pipe a is located to the right of the filter mechanism.

[0011] Preferably, the filtration mechanism further includes a connecting flange, a housing, an inner liner, and an electromagnet. The connecting flange is respectively disposed on both sides of the housing, and the electromagnet is disposed between the housing and the inner liner made of transparent polymer material. The electromagnet is electrically connected to the control cabinet in the production workshop.

[0012] Preferably, the two ends of the inner liner extend beyond the two sides of the connecting flange.

[0013] Preferably, the inner liner also includes a spiral guide vane and a flow stabilizer cover. The spiral guide vane is disposed on the inner side of the inner liner, and the flow stabilizer cover with holes is disposed on the left and right sides of the inner liner respectively.

[0014] Preferably, the inner side of the flow stabilizer cover is provided with threads, which are connected to the threads on the outer sides of both ends of the inner liner via threads.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The device is equipped with a pressure stabilizing mechanism to ensure a stable gas delivery function when carbon dioxide gas is supplied to the system, reducing surge caused by pressure fluctuations during delivery; it is also equipped with an auxiliary mechanism to dissipate vibrations between pipes, reducing the impact of vibrations on the bolts of connecting flanges and increasing the service life of the system; and it is equipped with a filtration mechanism to filter iron filings brought in by carbon dioxide gas at the inlet of the main pipe, preventing iron filings from re-corroding the inside of the pipes during gas delivery and increasing the service life of the delivery system. Attached Figure Description

[0017] Figure 1 is an isometric view of this utility model;

[0018] Figure 2 is a left view of this utility model;

[0019] Figure 3 is a sectional view of section a in Figure 2;

[0020] Figure 4 is a partial schematic diagram of b in Figure 3;

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Main pipe inlet; 2. Main pipe outlet; 3. Pressure stabilizing cylinder; 4. Compressed gas inlet pipe; 5. Electric valve a; 6. Electric valve b; 7. Pressure sensor a; 8. Inner cylinder; 9. Spring; 10. Valve plate; 11. Support block; 12. Pressure sensor b; 13. Compensating pipe a; 14. Compensating pipe b; 15. Connecting flange; 16. Outer shell; 17. Inner liner; 18. Electromagnet; 19. Spiral guide vane; 20. Flow stabilizer cover. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] The prior art in this embodiment has the following problems: The inventors have found the following defects in the prior art: 1. During the urea production process, the addition amount is unstable due to pressure fluctuations and gas volume limitations in the company's main gas pipeline, resulting in pressure fluctuations in the inlet pipe and causing a surge phenomenon due to pressure pulsation during carbon dioxide injection; 2. During the carbon dioxide transportation process, the transportation pipeline experiences mechanical vibrations caused by pressure pulsation, which affects the connection between the pipeline mounting clips and flanges, accelerating the fatigue fracture of bolts and increasing the system maintenance cost; 3. During the transportation of carbon dioxide in the pipeline, it easily carries rust solid impurities. These impurities, along with the gas, impact the pipe wall, causing erosion and wear, accelerating the wear inside the pipeline, and reducing the service life of the transportation system; Example 1

[0025] As shown in Figures 1 to 4:

[0026] Therefore, the inventor provides a stable carbon dioxide delivery device for urea production, including a main pipe inlet 1, a main pipe outlet 2, and a device body. The main pipe inlet 1 is located on the right side of the device body, and the main pipe outlet 2 is located on the left side of the device body. The device body also includes a pressure stabilizing mechanism, a filtering mechanism, and an auxiliary mechanism. The auxiliary mechanism, which provides buffering and vibration reduction functions, is located between the main pipe inlet 1 and the main pipe outlet 2. The filtering mechanism for filtering rust impurities is located on the left side of the main pipe inlet 1. The pressure stabilizing mechanism, which ensures stable gas delivery in the system, is located on the left side of the filtering mechanism. The pressure stabilizing mechanism, the filtering mechanism, and the auxiliary mechanism are all electrically connected to the production workshop control cabinet (not shown in the figure).

[0027] Using the above scheme, carbon dioxide gas enters the filter device through the main pipe inlet 1. After filtration, it enters the pressure stabilizing mechanism. After the pressure is stabilized in the pressure stabilizing mechanism, it is discharged from the main pipe outlet 2 through the auxiliary mechanism on the left. Example 2

[0028] As shown in Figures 1 to 4:

[0029] Furthermore, the pressure stabilizing mechanism also includes an air compressor, a pressure stabilizing cylinder 3, a compressed air inlet pipe 4, an electric valve a5, an electric valve b6, and a pressure sensor a7. The air compressor (not shown in the figure) is connected to the rear side of the pressure stabilizing cylinder 3 through the compressed air inlet pipe 4. The pressure stabilizing cylinder 3 is located on the left side of the main pipe inlet 1. The electric valve a5 is located on the right side of the pressure stabilizing cylinder 3. The electric valve b6 is located on the left side of the pressure stabilizing cylinder 3. The pressure sensor a7 is located above the pressure stabilizing cylinder 3.

[0030] Furthermore, the inner left side of the pressure stabilizing cylinder 3 is also provided with an inner cylinder 8, a spring 9, a valve plate 10, and a support block 11. The inner cylinder 8 is located on the inner left side of the pressure stabilizing cylinder 3, the spring 9 is located inside the inner cylinder 8, the valve plate 10 is located on the right side of the spring 9, the diameter of the valve plate 10 is larger than the diameter of the right inlet of the inner cylinder 8 and smaller than the inner diameter of the inner cylinder 8, and the support blocks 11 are respectively located on the outer side of the valve plate 10.

[0031] Furthermore, the auxiliary mechanism also includes a pressure sensor b12, a compensation pipe a13, and a compensation pipe b14. The pressure sensor b12 is located to the left of the electric valve b6, the compensation pipe b14 is located to the left of the pressure sensor b12, and the compensation pipe a13 is located to the right of the filter mechanism.

[0032] When the system is stopped, electric valve b6 and electric valve a5 are opened, and carbon dioxide gas is introduced into the pressure stabilizing cylinder 3 from the main pipe inlet 1. The pressure sensor a7 in the pressure stabilizing cylinder 3 detects the gas pressure signal in the pressure stabilizing cylinder 3 and transmits it to the production workshop control cabinet. After the production workshop control cabinet receives the pressure signal, if the pressure at the main pipe outlet 2 is greater than the pressure at the main pipe outlet 2, the gas will flow from the main pipe outlet 2 in the opposite direction from the inner cylinder 8 of the pressure stabilizing cylinder 3 to the main pipe inlet 1. At this time, the valve plate 10 in the inner cylinder 8 is pushed to the right by the elastic force of the spring 9, so that the valve plate 10 blocks the opening on the right side of the inner cylinder 8, preventing gas backflow, and can continuously and stably provide the system with gas at the specified working pressure.

[0033] Afterwards, the production workshop control cabinet controls the air compressor to start outputting compressed gas. The air compressor can be a 37KW magnetic levitation air compressor. The inlet end of the air compressor is connected to the carbon dioxide storage tank (not shown in the figure). The air compressor is equipped with frequency conversion regulation. When delivering carbon dioxide gas, it delivers carbon dioxide gas to the pressure stabilizing cylinder 3 at any time to maintain the pressure of carbon dioxide in the pressure stabilizing cylinder 3. The pressure sensor b12 monitors the carbon dioxide pressure at the main pipe outlet 2 in real time and transmits the pressure signal to the production workshop control cabinet in real time. When the pressure in the pressure stabilizing cylinder 3 reaches the set pressure higher than the main pipe outlet 2 of carbon dioxide, the air pressure in the pressure stabilizing cylinder 3 overcomes the set pressure of the spring 9 and pushes the valve plate 10 open. The valve plate 10 slides inside the inner cylinder 8, so that the gas in the pressure stabilizing cylinder 3 enters the inner cylinder 8 through the opening on the right side of the inner cylinder 8 from between the support blocks 11 and is released to the right through the electric valve b to the main pipe outlet 2. The support blocks 11 provide support for the valve plate 10 when the valve plate 10 moves.

[0034] During the gas delivery process, pressure sensor a7 monitors the pressure in pressure stabilizing cylinder 3, and pressure sensor b12 monitors the pressure at the main pipe outlet 2. The pressure signal is monitored in real time by the production workshop control cabinet. The pressure is regulated by supplying compressed gas to pressure stabilizing cylinder 3 through an air compressor, thereby ensuring a stable gas delivery function to the system when delivering carbon dioxide gas and reducing surge caused by pressure fluctuations during delivery.

[0035] Meanwhile, the pipeline vibration that occurs during gas transportation is eliminated by the compensation and vibration reduction effects of compensating pipes a13 and b14. In actual implementation, compensating pipes a13 and b14 can use corrugated compensators or braided metal hoses to reduce the impact of vibration on the bolts of the connecting flange 15 and increase the service life of the system. Example 3

[0036] As shown in Figures 1 to 4:

[0037] Furthermore, the filtration mechanism also includes a connecting flange 15, a housing 16, an inner liner 17, and an electromagnet 18. The connecting flange 15 is respectively located on both sides of the housing 16, and the electromagnet 18 is located between the housing 16 and the transparent polymer inner liner 17. The electromagnet 18 is electrically connected to the production workshop control cabinet.

[0038] Furthermore, the two ends of the inner liner 17 extend out from both sides of the connecting flange 15;

[0039] Furthermore, the inner liner 17 also includes a spiral guide vane 19 and a flow stabilizer cover 20. The spiral guide vane 19 is disposed on the inner side of the inner liner 17, and the flow stabilizer cover 20 with holes on its surface is disposed on the left and right sides of the inner liner 17 respectively.

[0040] Furthermore, the inner side of the flow stabilizer cover 20 is provided with a thread (not shown in the figure), which is connected to the outer side of both ends of the inner liner 17 by a thread (not shown in the figure).

[0041] Carbon dioxide gas enters the filtration mechanism from the main inlet 1 through the compensation pipe a13. After being diverted by the holes on the flow stabilizer cover 20, it enters the spiral guide vane 19 of the inner liner 17. As the gas rotates and flows along the spiral guide vane 19, rust impurities in the gas are decelerated by centrifugal force and adhere to the inner wall of the inner liner 17. Simultaneously, they are attracted to the inner wall of the inner liner 17 by the electromagnet 18 on the outside of the inner liner 17. The filtered gas is discharged from the flow stabilizer cover 20. After prolonged use, a large amount of iron filings are adsorbed onto the inner wall of the inner liner 17. When cleaning is required, the gas supply from the main inlet 1 is cut off, and the electromagnet 18 is disconnected from the production vehicle. The connection between the control cabinets is removed, and the attraction between the iron filings and the electromagnet 18 is released. The iron filings accumulate between the spiral guide vanes 19. The filter mechanism is removed by unfastening the bolts between the connecting flanges 15. The flow stabilizer covers 20 at both ends of the inner tank 17 are opened to clean out the iron filings accumulated in the inner tank 17. The cleaning status inside the inner tank 17 can be easily observed through the transparent polymer material of the inner tank 17. After that, the flow stabilizer covers 20 are installed, and the filter mechanism is reinstalled on the pipeline. In this way, by setting the filter mechanism to filter the iron filings brought in by the carbon dioxide gas in the main pipe inlet 1, the iron filings are prevented from re-corroding the inside of the pipeline during the gas transportation process, thereby increasing the service life of the transportation system.

[0042] In summary, the device is equipped with a pressure stabilizing mechanism to ensure stable gas delivery to the system when carbon dioxide gas is supplied, reducing surge caused by pressure fluctuations during delivery; it is equipped with an auxiliary mechanism to dissipate vibrations between pipes, reducing the impact of vibrations on the bolts of the connecting flange 15 and increasing the service life of the system; and it is equipped with a filtration mechanism to filter iron filings brought in by carbon dioxide gas at the inlet 1 of the main pipe, preventing iron filings from re-corroding the inside of the pipe during gas delivery and increasing the service life of the delivery system.

[0043] The working principle of this utility model:

[0044] When the system is stopped, electric valve b6 and electric valve a5 are opened, and carbon dioxide gas is introduced into the pressure stabilizing cylinder 3 from the main pipe inlet 1. The pressure sensor a7 in the pressure stabilizing cylinder 3 detects the gas pressure signal in the pressure stabilizing cylinder 3 and transmits it to the production workshop control cabinet. After the production workshop control cabinet receives the pressure signal, if the pressure at the main pipe outlet 2 is greater than the pressure at the main pipe inlet 1, the gas will flow from the main pipe outlet 2 in the opposite direction from the inner cylinder 8 of the pressure stabilizing cylinder 3 to the main pipe inlet 1. At this time, the valve plate 10 in the inner cylinder 8 is pushed to the right by the elastic force of the spring 9, so that the valve plate 10 blocks the opening on the right side of the inner cylinder 8, preventing the gas backflow caused by the pressure at the main pipe outlet 2 being greater than the pressure at the main pipe inlet 1.

[0045] Afterwards, the production workshop control cabinet controls the air compressor to start outputting compressed gas. The air compressor can be a 37KW magnetic levitation air compressor. The inlet end of the air compressor is connected to the carbon dioxide storage tank (not shown in the figure). The air compressor is equipped with frequency conversion regulation. When delivering carbon dioxide gas, it delivers carbon dioxide gas to the pressure stabilizing cylinder 3 at any time to maintain the pressure of carbon dioxide in the pressure stabilizing cylinder 3. The pressure sensor b12 monitors the carbon dioxide pressure at the main pipe outlet 2 in real time and transmits the pressure signal to the production workshop control cabinet in real time. When the pressure in the pressure stabilizing cylinder 3 reaches the set pressure higher than the main pipe outlet 2 of carbon dioxide, the air pressure in the pressure stabilizing cylinder 3 overcomes the set pressure of the spring 9 and pushes the valve plate 10 open. The valve plate 10 slides inside the inner cylinder 8, so that the gas in the pressure stabilizing cylinder 3 enters the inner cylinder 8 through the opening on the right side of the inner cylinder 8 from between the support blocks 11 and is released to the right through the electric valve b to the main pipe outlet 2. The support blocks 11 provide support for the valve plate 10 when the valve plate 10 moves.

[0046] During the gas delivery process, pressure sensor a7 monitors the pressure in pressure stabilizing cylinder 3, and pressure sensor b12 monitors the pressure at the main pipe outlet 2. The pressure signal is monitored in real time by the production workshop control cabinet. The pressure is regulated by supplying compressed gas to pressure stabilizing cylinder 3 through an air compressor, thereby ensuring a stable gas delivery function to the system when delivering carbon dioxide gas and reducing surge caused by pressure fluctuations during delivery.

[0047] Meanwhile, the pipeline vibration that occurs during gas transportation is eliminated by the compensation and vibration reduction effect of compensation pipe a13 and compensation pipe b14, reducing the impact of vibration on the bolts of connecting flange 15 and increasing the service life of the system.

[0048] Carbon dioxide gas enters the filtration mechanism from the main inlet 1 through the compensation pipe a13. After being diverted by the holes on the flow stabilizer cover 20, it enters the spiral guide vane 19 of the inner liner 17. As the gas rotates and flows along the spiral guide vane 19, rust impurities in the gas are decelerated by centrifugal force and adhere to the inner wall of the inner liner 17. Simultaneously, they are attracted to the inner wall of the inner liner 17 by the electromagnet 18 on the outside of the inner liner 17. The filtered gas is discharged from the flow stabilizer cover 20. After prolonged use, a large amount of iron filings are adsorbed onto the inner wall of the inner liner 17. When cleaning is required, the gas supply from the main inlet 1 is cut off, and the electromagnet 18 is disconnected from the production workshop. The connection between the control cabinets is removed, and the attraction between the iron filings and the electromagnet 18 is released. The iron filings accumulate between the spiral guide vanes 19. The filter mechanism is removed by unfastening the bolts between the connecting flanges 15. The flow stabilizing covers 20 at both ends of the inner tank 17 are opened to clean out the iron filings accumulated in the inner tank 17. The cleaning status inside the inner tank 17 can be easily observed through the transparent polymer material of the inner tank 17. After that, the flow stabilizing covers 20 are installed, and the filter mechanism is reinstalled on the pipeline. In this way, by setting the filter mechanism to filter the iron filings brought in by the carbon dioxide gas in the main pipe inlet 1, the iron filings are prevented from re-corroding the inside of the pipeline during the gas transportation process, thereby increasing the service life of the transportation system.

[0049] This concludes the description of the working principle of the device.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stable carbon dioxide conveying device for urea production, comprising a main pipe inlet (1), a main pipe outlet (2), and a device body, wherein the main pipe inlet (1) is located on the right side of the device body, and the main pipe outlet (2) is located on the left side of the device body, characterized in that: The device body also includes a pressure stabilizing mechanism, a filtering mechanism, and an auxiliary mechanism. The auxiliary mechanism, which provides buffering and vibration reduction functions, is respectively located between the main pipe inlet (1) and the main pipe outlet (2). The filtering mechanism for filtering rust impurities is located on the left side of the main pipe inlet (1). The pressure stabilizing mechanism, which ensures stable gas delivery in the system, is located on the left side of the filtering mechanism. The pressure stabilizing mechanism, the filtering mechanism, and the auxiliary mechanism are respectively connected to the production workshop control cabinet.

2. The stable carbon dioxide conveying device for urea production according to claim 1, characterized in that: The pressure stabilizing mechanism also includes an air compressor, a pressure stabilizing cylinder (3), a compressed air inlet pipe (4), an electric valve a (5), an electric valve b (6), and a pressure sensor a (7). The air compressor is connected to the rear side of the pressure stabilizing cylinder (3) through the compressed air inlet pipe (4). The pressure stabilizing cylinder (3) is located on the left side of the main pipe inlet (1). The electric valve a (5) is located on the right side of the pressure stabilizing cylinder (3). The electric valve b (6) is located on the left side of the pressure stabilizing cylinder (3). The pressure sensor a (7) is located above the pressure stabilizing cylinder (3).

3. The stable carbon dioxide conveying device for urea production according to claim 2, characterized in that: The pressure stabilizing cylinder (3) is further provided with an inner cylinder (8), a spring (9), a valve plate (10), and a support block (11) on the left side inside. The inner cylinder (8) is located on the left side inside the pressure stabilizing cylinder (3), the spring (9) is located inside the inner cylinder (8), and the valve plate (10) is located on the right side of the spring (9). The diameter of the valve plate (10) is larger than the diameter of the inlet on the right side of the inner cylinder (8) and smaller than the inner diameter of the inner cylinder (8). The support blocks (11) are respectively located on the outside of the valve plate (10).

4. A stable carbon dioxide conveying device for urea production according to claim 1, characterized in that: The auxiliary mechanism also includes a pressure sensor b (12), a compensation tube a (13), and a compensation tube b (14). The pressure sensor b (12) is located to the left of the electric valve b (6), the compensation tube b (14) is located to the left of the pressure sensor b (12), and the compensation tube a (13) is located to the right of the filter mechanism.

5. A stable carbon dioxide conveying device for urea production according to claim 1, characterized in that: The filter mechanism also includes a connecting flange (15), a housing (16), an inner liner (17), and an electromagnet (18). The connecting flange (15) is respectively located on both sides of the housing (16), and the electromagnet (18) is located between the housing (16) and the transparent polymer material inner liner (17). The electromagnet (18) is electrically connected to the production workshop control cabinet.

6. A stable carbon dioxide conveying device for urea production according to claim 5, characterized in that: The inner liner (17) extends out from both ends of the connecting flange (15).

7. A stable carbon dioxide conveying device for urea production according to claim 5, characterized in that: The inner liner (17) also includes a spiral guide plate (19) and a flow stabilizer cover (20). The spiral guide plate (19) is located on the inner side of the inner liner (17), and the flow stabilizer cover (20) with holes is located on the left and right sides of the inner liner (17).

8. A stable carbon dioxide conveying device for urea production according to claim 7, characterized in that: The inner side of the flow stabilizer cover (20) is provided with threads, which are connected to the threads on the outer sides of both ends of the inner liner (17) by threads.

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