Automatic slag cleaning device for dichloroethane distillation kettle

Abstract

The utility model discloses a kind of automatic deslagging devices of dichloroethane distillation kettle, including distillation kettle body, the lower end of the distillation kettle body is connected with fixed tube, the lower end of the fixed tube is connected with conical connecting cover, the fixed tube is fixed with connecting ring, one side of the connecting ring is connected with high-pressure gas transmission structure, the bottom of the distillation kettle body is equipped with rotating equipment, the upper end of the rotating equipment extends into conical connecting cover, the upper end of the rotating equipment is connected with scraper structure. The utility model integrates mechanical scraping, high-pressure gas pulse, gas recovery and residue flow guide, effectively solves the problem of low efficiency, serious pollution and high risk of traditional manual deslagging, significantly shortens the deslagging time, improves production continuity and equipment utilization, effectively prevents kettle body corrosion, coking, blockage and other problems, prolongs the service life of equipment, reduces the frequency of maintenance, realizes standard discharge, avoids VOCs exceeding standard and destroys environment.

Description

Technical Field

[0001] This utility model relates to the field of dichloroethane distillation residue removal technology, and in particular to an automatic residue removal device for dichloroethane distillation kettle. Background Technology

[0002] Dichloroethane is an organic compound widely used in chemical processing, as a solvent, and in the synthesis of vinyl chloride monomer. In industrial production, distillation purification of dichloroethane is a crucial step, as its purity directly affects the quality of subsequent products and production efficiency. However, during distillation, due to high temperatures and prolonged operation, impurities, trace amounts of unsaturated hydrocarbons, and residual metal catalysts in dichloroethane undergo polymerization and carbonization reactions, forming viscous, tar-like polymers that adhere to the bottom and sidewalls of the distillation vessel. High molecular weight polymers, especially those with boiling points above 200°C, are difficult to remove using conventional distillation methods.

[0003] Traditional manual slag removal methods have many drawbacks: Long downtime: Each slag removal requires stopping the machine and disassembling the vessel, which seriously affects the continuity of production; High labor intensity: Manual scraping is time-consuming and labor-intensive; High health risks: Operators need to be in direct contact with toxic residues and volatile organic compounds (VOCs), posing safety hazards; Environmental pollution: Opening the reactor during the slag removal process can easily cause VOCs leakage, polluting the air and violating environmental regulations; To address this issue, we propose an automatic slag removal device for dichloroethane distillation kettles. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an automatic slag removal device for dichloroethane distillation kettles.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An automatic slag removal device for a distillation kettle of dichloroethane includes a distillation kettle body. A fixed pipe is connected to the lower end of the distillation kettle body, and a conical connecting cover is connected to the lower end of the fixed pipe. A connecting ring is fixedly fitted around the circumference of the fixed pipe, and a high-pressure gas transmission structure is connected to one side of the connecting ring. A rotating device is provided at the bottom of the distillation kettle body, and the upper end of the rotating device extends into the conical connecting cover. A scraper structure is connected to the upper end of the rotating device. A discharge pipe is connected to one side of the lower end of the conical connecting cover, and a flow guide box is connected to one end of the discharge pipe. A volatile gas conveying pipe is connected to the upper end of the flow guide box, and a residue conveying pipe is connected to one end of the flow guide box.

[0006] Preferably, the high-pressure gas transmission structure includes a gas pump disposed on one side of the lower end of the distillation vessel body, the upper end of the gas pump is connected to a gas transmission pipe, the upper end of the gas transmission pipe is connected to one side of the lower end of a connecting ring, and a plurality of spray holes are provided at equal intervals and inclined on the inner side wall of the connecting ring, the spray holes and the fixed pipe are interconnected.

[0007] Preferably, the rotating device includes a mounting base disposed at the lower end of the distillation vessel body, a drive motor is mounted on the mounting base, a reduction gearbox is connected to the end of the output shaft of the drive motor, and the output shaft of the reduction gearbox passes through the side wall of the conical connecting cover and extends into the conical connecting cover.

[0008] Preferably, the scraper structure includes a fixed head fixed to the end of the gearbox output shaft, and multiple scrapers and arc-shaped stirring blades are fixed at equal intervals around the fixed head, with the scrapers and arc-shaped stirring blades arranged alternately.

[0009] Preferably, a feed pipe is connected to one side of the upper end of the distillation vessel body, an exhaust pipe is connected to the other side of the upper end of the distillation vessel body, and a discharge pipe is connected to one side of the lower end of the distillation vessel body.

[0010] Preferably, support legs are fixed on both sides of the lower end of the conical connecting cover.

[0011] In this utility model: 1. Distillation completion signal triggers slag removal mode: During the distillation process, the pressure sensor inside the vessel monitors the system pressure in real time. When the distillation is completed, the pressure change tends to stabilize (ΔP < 0.01 MPa), and the system automatically identifies and switches to the slag removal mode. 2. The scraper structure is activated to perform mechanical stripping: The drive motor starts and the speed is controlled between 5-10 rpm through the reduction gearbox, which drives the fixed head to rotate. The scraper then scrapes the inner wall and bottom of the conical connecting cover. 3. High-pressure gas transmission structure combined with pulse jet: When the scraper rotates 120°, the system triggers a high-pressure air pump to spray high-pressure gas through the nozzle, which impacts the surface of the residue and shakes off the tiny particles and polymers adhering to the inner wall of the equipment. 4. Centralized slag diversion and gas recovery: The detached residue flows into the guide box through the discharge pipe at the lower end of the conical connecting cover. The volatile gases are sent to the gas purification system for treatment through the volatile gas conveying pipe, while the residue enters the solid-liquid separation device through the residue conveying pipe. 5. The entire process is carried out in a closed system, ensuring environmental protection and safety: The entire slag removal process does not require opening the vessel, and all operations are completed in a closed system, effectively preventing VOCs leakage and protecting the health of operators and environmental safety.

[0012] This utility model has the following advantages: 1. The automatic slag removal device can be started immediately after distillation, eliminating the need for tedious processes such as waiting for cooling, dismantling the vessel, and manual cleaning, thus significantly shortening the slag removal time and improving production continuity and equipment utilization. 2. Regular automatic removal of polymer residue can effectively prevent problems such as corrosion, coking, and blockage of the vessel body, extend the service life of the equipment, and reduce the frequency of maintenance; 3. Through automation and enclosed design, workers do not need to directly contact residues and VOCs, reducing occupational hazards; 4. Volatile gases are introduced into the purification system through a dedicated delivery pipe to achieve emission standards and avoid VOCs exceeding the limit and damaging the environment; In summary, this utility model integrates mechanical scraping, high-pressure gas pulse, gas recovery, and residue diversion, effectively solving the problems of low efficiency, high pollution, and high risk associated with traditional manual slag cleaning. It significantly shortens slag cleaning time, improves production continuity and equipment utilization, effectively prevents problems such as vessel corrosion, coking, and blockage, extends equipment service life, reduces maintenance frequency, achieves compliant emissions, and avoids VOCs exceeding standards and damaging the environment. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the present invention; Figure 2 A structural diagram showing the high-pressure gas transmission structure of this utility model; Figure 3 This is a structural diagram showing the connection between the rotating device and the scraper structure of this utility model.

[0014] In the diagram: 1. Exhaust pipe, 2. Distillation vessel body, 3. Discharge pipe, 4. Gas supply pipe, 5. Air pump, 6. Support leg, 7. Drive motor, 8. Mounting base, 9. Flow guide box, 10. Residue conveying pipe, 11. Feed pipe, 12. Fixed pipe, 13. Connecting ring, 14. Discharge pipe, 15. Volatile gas conveying pipe, 16. Spray hole, 17. Conical connecting cover, 18. Scraper, 19. Fixed head, 20. Arc-shaped stirring blade, 21. Gearbox. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Reference Figure 1-3An automatic slag removal device for a dichloroethane distillation kettle includes a distillation kettle body 2, which is equipped with a feed pipe 11, an exhaust pipe 1, and a discharge pipe 3 for material input, gas discharge, and finished product discharge. The bottom of the distillation kettle body 2 is connected to a conical connecting cover 17 through a fixed pipe 12 to realize the centralized collection and diversion of material residue. The lower end of the distillation vessel body 2 is connected to a fixed pipe 12, and the lower end of the fixed pipe 12 is connected to a conical connecting cover 17. A connecting ring 13 is fixedly fitted around the fixed pipe 12. A high-pressure gas transmission structure is connected to one side of the connecting ring 13. A rotating device is provided at the bottom of the distillation vessel body 2. The driving device consists of a drive motor 7 and a reduction gearbox 21 to achieve low-speed high-torque output and ensure stable operation of the scraper. The upper end of the rotating device extends into the conical connecting cover 17. A scraper structure is connected to the upper end of the rotating device. A discharge pipe 14 is connected to one side of the lower end of the conical connecting cover 17. A guide box 9 is connected to one end of the discharge pipe 14. A volatile gas conveying pipe 15 is connected to the upper end of the guide box 9. The volatile gas conveying pipe 15 introduces the gas into the purification system. A residue conveying pipe 10 is connected to one end of the guide box 9. The residue conveying pipe 10 is used for the subsequent treatment and separation of residue. The discharge pipe 14 introduces the scraped residue into the guide box 9. The high-pressure gas transmission structure includes a gas pump 5 located on one side of the lower end of the distillation vessel body 2. The upper end of the gas pump 5 is connected to a gas transmission pipe 4, and the upper end of the gas transmission pipe 4 is connected to one side of the lower end of the connecting ring 13. Multiple spray holes 16 are provided at equal intervals on the inner side wall of the connecting ring 13. The spray holes 16 and the fixed pipe 12 are interconnected. The gas pump 5 is connected to the connecting ring 13 through the gas transmission pipe 4. Multiple inclined spray holes 16 are provided inside the connecting ring 13, which can realize the directional pulse injection of high-pressure gas to assist in slag removal. The rotating device includes a mounting base 8 located at the lower end of the distillation vessel body 2. A drive motor 7 is mounted on the mounting base 8. The output shaft of the drive motor 7 is connected to a reduction gearbox 21. The output shaft of the reduction gearbox 21 passes through the side wall of the conical connecting cover 17 and extends into the conical connecting cover 17. The mounting base 8 is used to fix the drive motor and the reduction gearbox, which facilitates maintenance and disassembly. The scraper structure includes a fixed head 19 fixed to the end of the output shaft of the gearbox 21. Multiple scrapers 18 and arc-shaped stirring blades 20 are fixed at equal intervals around the fixed head 19. The scrapers 18 and arc-shaped stirring blades 20 are staggered. The arc-shaped stirring blades 20 help to disturb the residue and improve the scraping efficiency. The staggered distribution of the scrapers 18 and arc-shaped stirring blades 20 ensures that the scraping action covers the entire area without dead corners. The scraper material is a ceramic-coated alloy, which has good corrosion resistance and wear resistance and is suitable for corrosive material environments such as dichloroethane. A feed pipe 11 is connected to one side of the upper end of the distillation vessel body 2, an exhaust pipe 1 is connected to the other side of the upper end of the distillation vessel body 2, a discharge pipe 3 is connected to one side of the lower end of the distillation vessel body 2, and support legs 6 are fixed on both sides of the lower end of the conical connecting cover 17. The support legs 6 are fixed to the bottom of the conical connecting cover 17 to ensure the stability of the overall structure. In this utility model: 1. Distillation completion signal triggers slag removal mode: During the distillation process, the pressure sensor inside the vessel monitors the system pressure in real time. When the distillation is completed, the pressure change tends to be stable (ΔP < 0.01MPa). The system automatically identifies and switches to the slag removal mode. A PLC control system is introduced, combined with a PID pressure control algorithm, to achieve higher process control accuracy and automation level. At the same time, the trigger threshold can be dynamically adjusted by comparing historical data to adapt to the distillation characteristics of different materials. 2. The scraper structure is activated to perform mechanical stripping: The drive motor starts and the speed is controlled between 5-10 rpm through the reduction gearbox, which drives the fixed head to rotate. The scraper then scrapes the inner wall and bottom of the conical connecting cover. 3. High-pressure gas transmission structure combined with pulse jet: When the scraper rotates 120°, the system triggers a high-pressure air pump to spray high-pressure gas through the nozzle, which impacts the surface of the residue and shakes off the tiny particles and polymers adhering to the inner wall of the equipment. 4. Centralized slag diversion and gas recovery: The detached residue flows into the guide box 9 through the discharge pipe 14 at the lower end of the conical connecting cover. The volatile gas is sent to the gas purification system for treatment through the volatile gas conveying pipe 15, while the residue enters the solid-liquid separation device through the residue conveying pipe 10. A liquid level sensor and a temperature detection module can be added inside the guide box 9 to monitor the moisture content of the residue and the concentration of volatile gas, so as to further optimize the subsequent processing flow. 5. The entire process is carried out in a closed system, ensuring environmental protection and safety: The entire slag removal process does not require opening the vessel, and all operations are completed in a closed system, effectively preventing VOCs leakage and protecting the health of operators and environmental safety.

[0017] This utility model is applied in the following fields: Chemical industry: Suitable for distillation of high-viscosity, easily polymerizable materials such as chlorinated hydrocarbons and aromatic hydrocarbons; Pharmaceutical industry: Can be used for automatic cleaning of high-purity solvent recovery systems; Environmental remediation: Applicable to residue removal from VOCs-containing waste gas treatment systems; Food industry: It can be used to remove charring residues in high-temperature distillation and concentration processes.

[0018] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An automatic slag removal device for a dichloroethane distillation kettle, comprising a distillation kettle body (2), characterized in that, The lower end of the distillation vessel body (2) is connected to a fixed pipe (12), the lower end of the fixed pipe (12) is connected to a conical connecting cover (17), a connecting ring (13) is fixedly fitted around the fixed pipe (12), a high-pressure gas transmission structure is connected to one side of the connecting ring (13), a rotating device is provided at the bottom of the distillation vessel body (2), the upper end of the rotating device extends into the conical connecting cover (17), a scraper structure is connected to the upper end of the rotating device, a discharge pipe (14) is connected to one side of the lower end of the conical connecting cover (17), a flow guide box (9) is connected to one end of the discharge pipe (14), a volatile gas conveying pipe (15) is connected to the upper end of the flow guide box (9), and a residue conveying pipe (10) is connected to one end of the flow guide box (9).

2. The automatic slag removal device for a dichloroethane distillation kettle according to claim 1, characterized in that: The high-pressure gas transmission structure includes a gas pump (5) located on one side of the lower end of the distillation vessel body (2). The upper end of the gas pump (5) is connected to a gas transmission pipe (4). The upper end of the gas transmission pipe (4) is connected to one side of the lower end of the connecting ring (13). Multiple spray holes (16) are provided at equal intervals on the inner side wall of the connecting ring (13). The spray holes (16) and the fixed pipe (12) are interconnected.

3. The automatic slag removal device for a dichloroethane distillation kettle according to claim 1, characterized in that: The rotating device includes a mounting base (8) located at the lower end of the distillation vessel body (2), on which a drive motor (7) is mounted. The output shaft of the drive motor (7) is connected to a reduction gearbox (21). The output shaft of the reduction gearbox (21) passes through the side wall of the conical connecting cover (17) and extends into the conical connecting cover (17).

4. The automatic slag removal device for a dichloroethane distillation kettle according to claim 3, characterized in that: The scraper structure includes a fixed head (19) fixed to the end of the output shaft of the gearbox (21). Multiple scrapers (18) and arc-shaped stirring blades (20) are fixed at equal intervals around the fixed head (19), and the scrapers (18) and arc-shaped stirring blades (20) are arranged alternately.

5. The automatic slag removal device for a dichloroethane distillation kettle according to claim 1, characterized in that: The upper side of the distillation vessel body (2) is connected to a feed pipe (11), the other side of the upper side of the distillation vessel body (2) is connected to an exhaust pipe (1), and the lower side of the distillation vessel body (2) is connected to a discharge pipe (3).

6. The automatic slag removal device for a dichloroethane distillation kettle according to claim 1, characterized in that: Support legs (6) are fixed on both sides of the lower end of the conical connecting cover (17).

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