Tail gas dust removal system for methyl cyanamide formate production

Abstract

The tail gas dust removal system comprises a connecting pipeline connected with tail gas generated during production of the methyl cyanamide formate, a tail gas treatment box is fixedly arranged on one side of the connecting pipeline, a first filter screen and a second filter screen are arranged in the tail gas treatment box, the first filter screen is close to the connecting pipeline, and the second filter screen is close to the connecting pipeline. Static electricity is generated on the static electricity generation cloth through friction between the static electricity generation cloth rotating and moving in the synchronous block and the rubber rod, small dust particles such as lime nitrogen are adsorbed through the static electricity, and the static electricity is neutralized through the static electricity neutralizer when the static electricity generation cloth circulates. The dust particles losing the electrostatic effect can fall off the inclined surface of the bottom of the synchronous block between the guide plates and finally slide out through the discharge holes to be collected, and during the period, the rubber sealing block and the shell are used for forming a closed space for the electrostatic adsorption area to reduce the influence of external factors on electrostatic adsorption.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas dust removal, in particular to a tail gas dust removal system for the production of methyl cyanamide formate. Background Art

[0002] Methyl cyanamide (CAS number: 21729-98-6) is a colorless liquid with a pungent odor. It is insoluble in water at room temperature but soluble in most organic solvents. It is primarily used in the synthesis of the highly effective, low-toxic pesticide carbendazim. Industrially, methyl cyanamide is produced through the cyanamination reaction of cyanamide (H2N-CN) generated by the hydrolysis of methyl monochloroformate and calcium nitrogen (Ca=N-CN). This reaction is then condensed with o-phenylenediamine [C6H4(NH2)2] in an acidic aqueous solution to produce carbendazim. The exhaust gas generated during the production of methyl cyanamide primarily contains calcium nitrogen particles, volatile organic compounds (VOCs), and hazardous gases. Volatile organic compounds are typically removed chemically. Lime nitrogen particles are a mixture of calcium cyanamide, calcium oxide, and other insoluble impurities. They are inorganic, toxic substances and often contain impurities such as carbon, resulting in a dark gray powder. Lime nitrogen particles decompose in contact with water to produce ammonia, which increases the difficulty and cost of exhaust gas treatment. Therefore, the exhaust gas from methyl cyanamide production is usually first dusted to remove lime nitrogen, carbon, and other particles, and then other volatile substances are removed.

[0003] Traditional dust removal devices, such as bag filters and wet dust collectors, are ineffective in removing dust particles such as lime nitrogen and carbon from exhaust gases. Bag filters, when used to treat methyl cyanamide exhaust, are susceptible to bag clogging and scorching due to the high concentration of volatile organic compounds (VOCs) in the exhaust, compromising dust removal effectiveness. Furthermore, bag filters have limited corrosion resistance, shortening their service life. Wet dust collectors, due to their operating principle, are not suitable for treating methyl cyanamide exhaust gases. Summary of the Invention

[0004] In order to solve the problems mentioned in the above background technology, according to the characteristics of tail gas produced by methyl cyanamide formate, the present invention provides a tail gas dust removal system for the production of methyl cyanamide formate.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A tail gas dust removal system for methyl cyanamide formate production, comprising a connecting pipe connected to tail gas from the methyl cyanamide formate production, a tail gas treatment box fixedly provided on one side of the connecting pipe, a first filter and a second filter provided inside the tail gas treatment box, wherein the first filter is close to the connecting pipe, a synchronization block is sleeved on the outer side of the second filter, an extension frame is provided at both ends of the synchronization block, and the extension frame and the synchronization block are mutually limited by the synchronization block;

[0007] The synchronization block includes a rubber sealing block arranged on the side of the second filter away from the connecting pipe, and a shell is provided on the side of the second filter close to the connecting pipe. Two synchronization rollers are provided inside the shell and static electricity generating cloth is sleeved on the outside of the two synchronization rollers. One side of the static electricity generating cloth is close to the second filter and contacts the surface of the second filter. At least one rubber rod is also provided on the side of the static electricity generating cloth close to the second filter, and the friction between the rubber rod and the static electricity generating cloth generates static electricity on the static electricity generating cloth to achieve the use of static electricity to adsorb fine dust particles on the surface of the second filter. An electrostatic neutralizer is provided at the bottom of the side of the static electricity generating cloth away from the second filter to neutralize the static electricity phenomenon and make the dust particles fall naturally. During this period, the rubber sealing block and the shell are used to form a closed space in the static electricity adsorption area to reduce the influence of external factors on static electricity adsorption.

[0008] Furthermore, the extension frame is fixed to the outside of the sealing box and the outside of the synchronization block is fixedly connected to a connector, a threaded rod is threadedly connected to the connector, one end of the threaded rod is movably connected to the bottom of the extension frame through a bearing, and the other end passes through the extension frame and extends to the top of the extension frame, and the end extending to the top of the extension frame is transmission-connected to motor 2 to realize the rotation of the threaded rod.

[0009] Furthermore, an insulating cloth for isolating the extension frame and the sealing box is fixedly connected to the outside of the synchronization block, the upper and lower ends of the extension frame are fixedly connected to the sealing box and both ends of the insulating cloth extend into the interior of the sealing box, a central axis is movably provided inside the sealing box and both ends of the insulating cloth are wound and connected with the two central axis, and a torsion spring is fixedly provided on one of the central axis for providing force for rewinding the insulating cloth to realize the rewinding and resetting of the insulating cloth.

[0010] Furthermore, two extension racks are also provided on both sides of the filter screen one, and a scraper is provided on the side of the filter screen one close to the connecting pipe. The sliding arrangement between the scraper and the extension rack is consistent with the sliding structure of the synchronization block and the extension rack, and the threaded rods extending from the sealing box on both sides of the filter screen one and the threaded rods on both sides of the filter screen two are driven synchronously with each other through the synchronization component. The extension racks on both sides of the filter screen one are also provided with sealing boxes and isolation cloths for isolating the extension racks and the internal structure of the sealing box. The specific structure is the same as the sealing box and isolation cloth structure provided on both sides of the synchronization block.

[0011] Furthermore, the synchronization component includes a synchronization belt 1 sleeved on the diagonal threaded rod, and a synchronization belt 2 sleeved between the two threaded rods on one side.

[0012] Furthermore, a motor 1 is provided on the synchronization block, and an output shaft of the motor 1 passes through the synchronization block and is transmission-connected to one of the synchronization rollers for driving the synchronization roller to rotate.

[0013] Furthermore, the bottom of the shell is inclined to form an inclined surface, and at least two guide plates are fixedly connected to the bottom of the inclined surface to receive and guide the dust particles generated by the static electricity after the static electricity is neutralized by the static neutralizer, and an exhaust hole connected to an external collection device is opened on the lower side of the shell ground.

[0014] Beneficial effects of the present invention:

[0015] 1. In the technical solution of the present invention, the friction between the static-generating cloth rotating inside the synchronized block and the rubber rod generates static electricity on the static-generating cloth itself, which is then used to absorb dust particles such as lime nitrogen. Furthermore, the static electricity is neutralized by the static neutralizer during the circulation of the static-generating cloth. The dust particles lose the static electricity effect and fall onto the inclined surface at the bottom of the synchronized block between the guide plates, eventually sliding out through the discharge hole for collection. During this process, the rubber sealing block and the outer shell form a closed space in the static-adsorption area to reduce the influence of external factors on static-adsorption. Furthermore, the arrangement between the threaded rod, the connector, and the synchronized block, and the motor 2 at the top of the threaded rod (not shown in the figure) can drive the entire synchronized block up and down to absorb dust particles from all sides of the filter screen 2. The threaded rods on both sides of the filter screen 1 then synchronously drive the scraper to move up and down to remove the dust particles. The entire process has the effect of classifying and treating the dust particles. Larger dust particles are directly scraped off by the scraper, while fine dust particles can be effectively cleaned by static adsorption due to the dense and fine filter screen. The entire process has little impact on the filtering effect of the filter screen 2 and achieves a good cleaning effect.

[0016] 2. In the technical solution of the present invention, the sealing box and the insulating cloth structure are provided to effectively isolate the space between the extension frame and the sealing box, preventing external dust and impurities from entering the electrostatic adsorption area, further ensuring the effect and stability of the electrostatic adsorption. At the same time, the insulating cloth can be automatically rewound and reset through the setting of the central axis and the torsion spring, facilitating the up and down movement of the synchronization block and maintaining the sealing performance of the sealing box. In addition, the same sealing box and insulating cloth structure are also provided on both sides of the filter screen one, and the synchronous drive with the threaded rods on both sides of the filter screen two is achieved through the synchronous assembly, so that the scraper can move up and down synchronously to clean the dust particles such as lime nitrogen on the filter screen one, thereby improving the cleaning efficiency, ensuring the stability and reliability of the entire dust removal system, extending the service life of the filter screen, and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle part;

[0020] Figure 3 It is a three-dimensional schematic diagram of the internal structure of the present invention;

[0021] Figure 4 A schematic diagram of the internal structure of a synchronization block of the present invention;

[0022] Figure 5 For the present invention Figure 4 A partial enlarged view of part B in the middle;

[0023] Figure 6 It is a schematic diagram of the internal structure of the sealing box of the present invention.

[0024] In the figure: 1. Central shaft; 2. Exhaust gas treatment box; 3. Sealing box; 4. Synchronous belt 2; 5. Synchronous belt 1; 6. Connecting pipe; 7. Extension frame; 8. Motor 1; 9. Isolation cloth; 10. Connector; 11. Threaded rod; 12. Synchronous block; 1201. Rubber sealing block; 1202. Housing; 13. Discharge hole; 14. Filter 2; 15. Filter 1; 16. Scraper; 17. Static electricity generating cloth; 18. Guide plate; 19. Inclined surface; 20. Rubber rod; 21. Synchronous roller; 22. Static electricity neutralizer; 23. Torsion spring. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] Example 1

[0027] The present invention provides Figure 1-6A tail gas dust removal system for the production of methyl cyanamide formate shown in the figure comprises a connecting pipe 6 for connecting the tail gas of the methyl cyanamide formate production, a tail gas treatment box 2 is fixedly provided on one side of the connecting pipe 6, a filter screen 15 and a filter screen 2 14 are provided inside the tail gas treatment box 2, and the filter screen 15 is close to the connecting pipe 6, and a synchronization block 12 is sleeved on the outside of the filter screen 2, and an extension frame 7 is provided at both ends of the synchronization block 12, and the extension frame 7 and the synchronization block 12 are mutually limited by the synchronization block 12;

[0028] The synchronization block 12 includes a rubber sealing block 1201 arranged on the side of the filter screen 14 away from the connecting pipe 6, and a shell 1202 is provided on the side of the filter screen 14 close to the connecting pipe 6. Two synchronization rollers 21 are arranged inside the shell 1202, and the outer side of the two synchronization rollers 21 is provided with an electrostatic generating cloth 17. One side of the electrostatic generating cloth 17 is close to the filter screen 14 and contacts the surface of the filter screen 14. At least one rubber rod 20 is also provided on the side of the electrostatic generating cloth 17 close to the filter screen 14, and the friction between the rubber rod 20 and the electrostatic generating cloth 17 generates static electricity on the electrostatic generating cloth 17, so as to utilize static electricity to adsorb dust particles with smaller particle size on the surface of the filter screen 14. A static neutralizer 22 is provided at the bottom of the side of the static generating cloth 17 away from the filter screen 14 for neutralizing the static electricity phenomenon and allowing the dust particles to fall naturally. During this period, the rubber sealing block 1201 and the shell 1202 are used to form a closed space in the electrostatic adsorption area to reduce the influence of external factors on electrostatic adsorption.

[0029] Specifically, the extension frame 7 is fixed to the outside of the sealing box 3 and the outside of the synchronization block 12 is fixedly connected to a connector 10, and a threaded rod 11 is threadedly connected to the connector 10. One end of the threaded rod 11 is movably connected to the bottom of the extension frame 7 through a bearing, and the other end passes through the extension frame 7 and extends to the top of the extension frame 7. The end extending to the top of the extension frame 7 is transmission-connected to a motor 2 (not shown in the figure). An isolation cloth 9 for isolating the extension frame 7 from the sealing box 3 is fixedly connected to the outside of the synchronization block 12. The upper and lower ends of the extension frame 7 are fixedly connected to the sealing box 3 and both ends of the isolation cloth 9 extend to the inside of the sealing box 3. A central shaft 1 is movably provided inside the sealing box 3 and both ends of the isolation cloth 9 are wound around the two central shafts 1. A torsion spring 23 is fixedly provided on the outside of one of the central shafts 1 to realize the rewinding and resetting of the isolation cloth 9.

[0030] Specifically, two extension frames 7 are also provided on both sides of the filter screen 15, and a scraper 16 is provided on the side of the filter screen 15 close to the connecting pipe 6. The sliding setting between the scraper 16 and the extension frame 7 is consistent with the sliding structure of the synchronization block 12 and the extension frame 7, and the threaded rods 11 extending from the sealing box 3 on both sides of the filter screen 15 and the threaded rods 11 on both sides of the filter screen 2 14 are driven synchronously with each other through the synchronization component. The extension frames 7 on both sides of the filter screen 15 are also provided with sealing boxes 3 and isolation cloth 9 for isolating the extension frames 7 from the internal structure of the sealing box 3. The specific structure is the same as the sealing box 3 and isolation cloth 9 structure provided on both sides of the synchronization block 12.

[0031] Specifically, the synchronization component includes a synchronization belt 1 5 sleeved on the diagonal threaded rods 11, and a synchronization belt 2 4 sleeved between the two threaded rods 11 on one side.

[0032] Specifically, a motor 8 is provided on the synchronization block 12 , and an output shaft of the motor 8 passes through the synchronization block 12 and is transmission-connected to one of the synchronization rollers 21 .

[0033] Specifically, the bottom of the shell 1202 is inclined to form an inclined surface 19, and at least two guide plates 18 are fixedly connected to the bottom of the inclined surface 19 to receive and guide the dust particles generated by the static electricity-generating cloth 17 after the static electricity is neutralized by the static electricity neutralizer 22, and an exhaust hole 13 connected to an external collection device is opened on the lower side of the shell 1202.

[0034] Working principle: When using the device of the present invention, the exhaust gas is connected through the connecting pipe 6 to transport the exhaust gas to the inside of the sealed box 3, and then the filter screen 15 is used to block the larger dust particles, and then the filter screen 2 14 is used to filter the fine dust particles. A synchronization block 12 is provided on the filter screen 2 14, and the friction between the static electricity generating cloth 17 rotating and moving inside the synchronization block 12 and the rubber rod 20 is used to generate static electricity on the static electricity generating cloth 17 itself, and static electricity is used to adsorb tiny dust particles, and when the static electricity generating cloth 17 circulates, the static electricity is neutralized by the static electricity neutralizer 22. The dust particles that lose the static electricity effect will fall on the bottom inclined surface 19 of the synchronization block 12 between the guide plates 18 and finally slide out through the discharge hole 13 for collection. During this period, the rubber sealing block 1201 and the shell 1202 are used to form a closed space for the static adsorption area to reduce the influence of external factors on static adsorption. Then the threaded rod 11 and the connector 1 can also be used. The setting between 0 and the synchronous block 12 and the motor 2 at the top of the threaded rod 11 are not shown in the figure, which can drive the overall synchronous block 12 to move up and down to adsorb dust particles on all sides of the filter screen 14, and then use the threaded rods 11 on both sides of the filter screen 15 to synchronously drive the scraper 16 to move up and down to process the dust particles. The whole process has a classification effect on the dust particles. Larger dust particles are directly scraped off by the scraper 16. Fine dust particles can be better cleaned by electrostatic adsorption because the filter screen is also dense and fine. The whole process has little effect on the filtering effect of the filter screen 14, and the cleaning effect is good, which is easy to use. An isolation piece can also be provided in the middle of the static electricity generating cloth 17 to isolate the static electricity generated by the static electricity neutralizer 22 on the static electricity generating cloth 17 near the end of the filter screen 14. The rubber rod 20 can also rotate by the external power system to increase the static electricity generation effect.

[0035] Throughout the specification, references to terms such as "embodiment" or "various embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or preparation example are included in at least one embodiment or preparation example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or preparation example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or preparation examples.

[0036] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A tail gas dust removal system for the production of methyl cyanamide formate, comprising a connecting pipe (6) for connecting the tail gas of the production of methyl cyanamide formate and a tail gas treatment box (2), characterized in that: An exhaust gas treatment box (2) is fixedly arranged on one side of the connecting pipe (6), a filter screen 1 (15) and a filter screen 2 (14) are arranged inside the exhaust gas treatment box (2), and the filter screen 1 (15) is close to the connecting pipe (6), and a synchronization block (12) is sleeved on the outer side of the filter screen 2 (14), and extension frames (7) are arranged at both ends of the synchronization block (12), and the extension frame (7) and the synchronization block (12) are mutually limited by the synchronization block (12); The synchronization block (12) comprises a rubber sealing block (1201) arranged on a side of the second filter screen (14) away from the connecting pipe (6); a shell (1202) is arranged on the side of the second filter screen (14) close to the connecting pipe (6); two synchronization rollers (21) are arranged inside the shell (1202); and static electricity generating cloth (17) is sleeved on the outer sides of the two synchronization rollers (21); one side of the static electricity generating cloth (17) is close to the second filter screen (14) and contacts the surface of the second filter screen (14); at least one rubber rod (20) is also arranged on the side of the static electricity generating cloth (17) close to the second filter screen (14); and the static electricity generating cloth (17) generates static electricity through friction between the rubber rod (20) and the static electricity generating cloth (17), so as to utilize static electricity to absorb dust particles on the surface of the second filter screen (14); and a static electricity neutralizer (22) is arranged at the bottom of the side of the static electricity generating cloth (17) away from the second filter screen (14).

2. A tail gas dust removal system for the production of methyl cyanamide formate according to claim 1, characterized in that: The extension frame (7) is fixed on the outside of the sealing box (3) and the outside of the synchronization block (12) is fixedly connected with a connecting body (10), a threaded rod (11) is threadedly connected to the connecting body (10), one end of the threaded rod (11) is movably connected to the bottom of the extension frame (7) through a bearing, and the other end passes through the extension frame (7) and extends to the top of the extension frame (7), and the end extending to the top of the extension frame (7) is transmission-connected to a second motor.

3. A tail gas dust removal system for the production of methyl cyanamide formate according to claim 2, characterized in that: An insulating cloth (9) for isolating the extension frame (7) and the sealing box (3) is fixedly connected to the outside of the synchronization block (12); the upper and lower ends of the extension frame (7) are fixedly connected to the sealing box (3) and both ends of the insulating cloth (9) extend into the inside of the sealing box (3); a central shaft (1) is movably arranged inside the sealing box (3) and both ends of the insulating cloth (9) are wound around and connected to the two central shafts (1); a torsion spring (23) is fixedly arranged on the outside of one of the central shafts (1) to realize the rewinding and resetting of the insulating cloth (9).

4. A tail gas dust removal system for the production of methyl cyanamide formate according to claim 1, characterized in that: Two extension frames (7) are also arranged on both sides of the filter screen one (15), and a scraper (16) is arranged on one side of the filter screen one (15) close to the connecting pipe (6). The sliding arrangement between the scraper (16) and the extension frame (7) is consistent with the sliding structure between the synchronization block (12) and the extension frame (7), and the threaded rods (11) extending from the sealing box (3) arranged on both sides of the filter screen one (15) and the threaded rods (11) on both sides of the filter screen two (14) are synchronously driven by each other through the synchronization component. The extension frames (7) on both sides of the filter screen one (15) are also provided with sealing boxes (3) and insulating cloth (9) for isolating the extension frames (7) from the internal parts of the sealing boxes (3). The specific structure is the same as the sealing boxes (3) and insulating cloth (9) arranged on both sides of the synchronization block (12).

5. A tail gas dust removal system for the production of methyl cyanamide formate according to claim 1, characterized in that: The synchronization component comprises a synchronization belt 1 (5) sleeved on the diagonal threaded rod (11), and a synchronization belt 2 (4) sleeved between two threaded rods (11) on one side.

6. A tail gas dust removal system for the production of methyl cyanamide formate according to claim 1, characterized in that: The synchronization block (12) is provided with a motor 1 (8), and the output shaft of the motor 1 (8) passes through the synchronization block (12) and is transmission-connected to one of the synchronization rollers (21).

7. A tail gas dust removal system for the production of methyl cyanamide formate according to claim 1, characterized in that: The bottom of the housing (1202) is inclined to form an inclined surface (19), and at least two guide plates (18) are fixedly connected to the bottom of the inclined surface (19) to receive and guide dust particles generated by static electricity in the static electricity generating cloth (17) after the static electricity is neutralized by the static electricity neutralizer (22), and a discharge hole (13) connected to an external collection device is provided on the side of the housing (1202) lower than the ground.

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