Wiped film evaporation device for imidacloprid oil layer wastewater distillation

Abstract

The utility model belongs to the technical field of imidacloprid oil layer wastewater distillation, and discloses a wiped-film evaporation device for imidacloprid oil layer wastewater distillation, which comprises a base and an evaporator, a feeding tank is mounted on one side of the top end of the base, a feeding pipeline is mounted on one side of the feeding tank, a feeding pump is mounted at one end of the feeding pipeline, and the evaporator is mounted at the other end of the feeding pipeline. The evaporator comprises an evaporation barrel, a central rotating shaft, a plurality of film scraping plates, a steam inlet, a gas phase outlet, a liquid phase outlet and a driving assembly, the evaporation barrel is installed at the top end of the base, the central rotating shaft is installed in the evaporation barrel through a bearing seat, and the film scraping plates are installed on the peripheral side of the central rotating shaft at equal intervals; and the steam inlet is formed in the middle position of one side of the evaporation barrel. According to the device, the operation process is simplified, the maintenance cost is reduced, the reliability and durability of equipment are improved, and a new solution is provided for treatment of the imidacloprid oil layer wastewater.

Description

Technical Field

[0001] This utility model belongs to the field of distillation technology for imidacloprid oil layer wastewater, and more specifically, it relates to a scraped film evaporation device for distillation of imidacloprid oil layer wastewater. Background Technology

[0002] Imidacloprid is a widely used broad-spectrum insecticide belonging to the neonicotinoid class of compounds. It is commonly used in agriculture. Imidacloprid oil layer wastewater distillation refers to a method of separating and removing harmful components by using distillation technology when treating wastewater containing imidacloprid and oily substances.

[0003] Some current scraped-film evaporators used for distilling imidacloprid oil layer wastewater have uneven material distribution on the evaporation wall, which affects heat and mass transfer efficiency and thus reduces distillation effect. In addition, the vacuum system of some devices is unstable and it is difficult to maintain a constant low-pressure environment, resulting in large fluctuations in the distillation process and making it impossible to guarantee the stability and purity of the distillate.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a scraped film evaporation device for distilling wastewater from imidacloprid oil layers, in order to achieve a more practical purpose. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a scraped film evaporation device for distilling wastewater from imidacloprid oil layers, which is achieved by the following specific technical means:

[0006] A scraped-film evaporator for distilling wastewater from imidacloprid oil layers includes a base and an evaporator. A feed tank is installed on one side of the top of the base, and a feed pipe is installed on one side of the feed tank. A feed pump is installed at one end of the feed pipe, and the other end of the feed pipe is connected to the evaporator. The evaporator includes an evaporation cylinder, a central rotating shaft, several scraper blades, a steam inlet, a gas phase outlet, a liquid phase outlet, and a drive assembly. The evaporation cylinder is installed at the top of the base, and the central rotating shaft is installed inside the evaporation cylinder via a bearing seat. The scraper blades are equidistantly installed around the central rotating shaft. The steam inlet is located at... At the middle position on one side of the evaporator cylinder, the gas phase outlet is located at the top of the evaporator cylinder, and the liquid phase outlet is located at the bottom of the evaporator cylinder. Both the gas phase outlet and the liquid phase outlet are equipped with monitoring systems. The evaporator cylinder is equipped with a heating jacket inside. A discharge pipe is installed at the bottom of the liquid phase outlet, and a discharge pump is installed at one end of the discharge pipe. A collection bucket is installed at the top of the base at one end of the discharge pipe. A separation system is connected to one side of the gas phase outlet through a pipe. A vacuum assembly is installed on one side of the top of the base, and the vacuum assembly is connected to the evaporator cylinder.

[0007] Furthermore, the drive assembly includes a housing, a first driven bevel gear, and a transmission rod. The housing is installed on one side of the top of the evaporator shell. A motor is installed inside the housing. The output end of the motor is connected to a driving bevel gear via a coupling. The first driven bevel gear is installed at the top of the central rotating shaft. The transmission rod is rotatably installed inside the housing via a bearing seat. A pair of second driven bevel gears are symmetrically installed at both ends of the transmission rod, and the pair of second driven bevel gears are respectively meshed with the driving bevel gear and the first driven bevel gear.

[0008] Furthermore, the monitoring system includes two pairs of temperature sensors and pressure sensors.

[0009] Furthermore, the vacuum assembly includes a vacuum pump, a vacuum buffer tank, two vacuum pipes, and a control valve. The vacuum pump is installed on one side of the top of the base, the vacuum buffer tank is installed on the top of the base near the vacuum pump, the two vacuum pipes are respectively installed between the vacuum pump and the vacuum buffer tank and between the vacuum buffer tank and the evaporation cylinder, and the control valve is installed at one end of one of the vacuum pipes used to connect the vacuum buffer tank and the evaporation cylinder.

[0010] Furthermore, the separation system includes a gas-liquid separation tower, which is connected to the gas phase outlet.

[0011] Furthermore, the separation system includes a packed tower connected to the gas phase outlet.

[0012] Furthermore, a controller is installed on one side of the top of the base.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The scraped-film evaporator for distilling imidacloprid oil layer wastewater of this utility model, through the coordinated use of a base, evaporator, feed tank, feed pipe, feed pump, evaporation cylinder, central rotating shaft, scraper plate, steam inlet, gas phase outlet, liquid phase outlet, monitoring system, heating jacket, discharge pipe, discharge pump, collection tank, separation system, chassis, first driven bevel gear, transmission rod, motor, driving bevel gear, second driven bevel gear, vacuum pump, vacuum buffer tank, vacuum pipe, control valve and controller, facilitates the more uniform distribution of imidacloprid oil layer wastewater on the inner wall of the evaporator through the evaporator and its internal scraper plate and other structures, thereby improving the evaporation effect. At the same time, it can accurately control the temperature, pressure and other parameters during the distillation process to ensure accurate separation and collection of fractions, thereby simplifying the operation process, reducing maintenance costs, improving the reliability and durability of the equipment, and providing a new solution for the treatment of imidacloprid oil layer wastewater. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0016] Figure 2 This is a side sectional view of the evaporator structure of this utility model.

[0017] Figure 3 This is the utility model Figure 1 An enlarged schematic diagram of part A in the middle.

[0018] Figure 4 This is the utility model Figure 1 Enlarged schematic diagram of part B.

[0019] Figure 5 This is the utility model Figure 2 An enlarged schematic diagram of section C.

[0020] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0021] 1. Base; 2. Evaporator; 3. Feed tank; 4. Feed pipe; 5. Feed pump; 6. Evaporation cylinder; 7. Central shaft; 8. Scraper; 9. Steam inlet; 10. Gas phase outlet; 11. Liquid phase outlet; 12. Monitoring system; 13. Heating jacket; 14. Discharge pipe; 15. Discharge pump; 16. Collection tank; 17. Separation system; 18. Chassis; 19. First driven bevel gear; 20. Transmission rod; 21. Motor; 22. Driving bevel gear; 23. Second driven bevel gear; 24. Vacuum pump; 25. Vacuum buffer tank; 26. Vacuum pipe; 27. Control valve; 28. Controller. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example:

[0026] As attached Figure 1 To be continued Figure 5 As shown:

[0027] This invention provides a scraped film evaporator for distilling wastewater from imidacloprid oil layers, comprising a base 1 and an evaporator 2. A feed tank 3 is installed on one side of the top of the base 1, with an observation window on its surface and a level gauge inside. Operators can observe the liquid level changes in the feed tank 3 in real time using the observation window and level gauge. A feed pipe 4 is installed on one side of the feed tank 3, with a feed pump 5 installed at one end and the other end connected to the evaporator 2. The evaporator 2 includes an evaporation cylinder 6, a central rotating shaft 7, several scraper blades 8, a steam inlet 9, a gas phase outlet 10, a liquid phase outlet 11, and a drive assembly. The evaporation cylinder 6 is installed on the top of the base 1. The central rotating shaft 7 is cylindrical and mounted inside the evaporation cylinder 6 via a bearing seat. The scraper blades 8 are mounted via a bracket and are in close contact with the inner wall of the evaporator 2. The scraper blades 8 are equidistantly installed around the central rotating shaft 7. The steam inlet 9 is located at the middle position on one side of the evaporation cylinder 6. The steam inlet 9 is equipped with a flange and is connected to the steam generator via a pipe. The gas phase outlet 10 is located at the top of one side of the evaporator cylinder 6, and the liquid phase outlet 11 is located at the bottom of the evaporator cylinder 6. Both the gas phase outlet 10 and the liquid phase outlet 11 are equipped with monitoring systems 12. The evaporator cylinder 6 is equipped with a heating jacket 13 inside, which wraps around the inner periphery of the feed tank 3 to achieve uniform heating and heat preservation. The heating jacket 13 heats the evaporator cylinder 6 through heat transfer media such as steam or heat transfer oil. The bottom of the liquid phase outlet 11 is equipped with a discharge pipe 14, and a discharge pump 15 is installed at one end of the discharge pipe 14. A collection bucket 16 is installed at the top of the base 1 at one end of the discharge pipe 14. The collection bucket 16 and the discharge pipe 14 are detachably installed to facilitate quick separation of the collection bucket 16 from the discharge pipe 14. One side of the gas phase outlet 10 is connected to a separation system 17 via a pipe. A vacuum assembly is installed on one side of the top of the base 1 and is connected to the evaporator cylinder 6.

[0028] The feed pump 5 can slowly replenish the imidacloprid oil layer wastewater in the feed tank 3 to the evaporator 2. The evaporator 2 evaporates the imidacloprid oil layer wastewater and discharges the gaseous substances generated by evaporation from the gas phase outlet 10. The residual liquid after evaporation is discharged from the liquid phase outlet 11. The heating jacket 13 can heat the evaporation cylinder 6 with heat mediums such as steam or heat transfer oil. The vacuum component can provide and maintain a vacuum environment in the evaporator 2 to meet the requirements of negative pressure distillation. The monitoring system 12 is located at key parts such as the gas phase outlet 10 and the liquid phase outlet 11. It can monitor temperature and pressure changes in real time and display and record them through the controller 28 so that the operator can adjust the operating parameters in time.

[0029] The drive assembly includes a housing 18, a first driven bevel gear 19, and a transmission rod 20. The housing 18 is installed on one side of the top of the evaporator shell 6. A motor 21 is installed inside the housing 18. The output end of the motor 21 is connected to a driving bevel gear 22 via a coupling. The first driven bevel gear 19 is installed at the top of the central rotating shaft 7. The transmission rod 20 is rotatably installed inside the housing 18 via a bearing seat. A pair of second driven bevel gears 23 are symmetrically installed at both ends of the transmission rod 20, and the pair of second driven bevel gears 23 are respectively meshed with the driving bevel gear 22 and the first driven bevel gear 19.

[0030] Through the transmission of the driving bevel gear 22, the first driven bevel gear 19, the transmission rod 20, and the second driven bevel gear 23, the central rotating shaft 7 can drive several scraper plates 8 to rotate together, thereby evenly distributing the liquid on the inner wall of the cylinder and forming a liquid film, increasing the evaporation area and improving the evaporation efficiency.

[0031] The monitoring system 12 includes two pairs of temperature sensors and pressure sensors.

[0032] The temperature sensor can be an RTD sensor, and the pressure sensor can be a Honeywell sensor, etc. It can monitor temperature and pressure in real time and transmit the monitored data to the controller 28 for processing and analysis.

[0033] The vacuum assembly includes a vacuum pump 24, a vacuum buffer tank 25, two vacuum pipes 26, and a control valve 27. The vacuum pump 24 is installed on one side of the top of the base 1, and the vacuum buffer tank 25 is installed at the top of the base 1 near the vacuum pump 24. The two vacuum pipes 26 are respectively installed between the vacuum pump 24 and the vacuum buffer tank 25 and between the vacuum buffer tank 25 and the evaporator 6. The two vacuum pipes 26 connect the vacuum assembly and the evaporator 2 together. The control valve 27 is installed at one end of one of the vacuum pipes 26 used to connect the vacuum buffer tank 25 and the evaporator 6.

[0034] The vacuum assembly can maintain a stable pressure inside the evaporator 6 and control the pressure inside the evaporator 6. The vacuum buffer tank 25 can prevent liquid backflow and other issues.

[0035] The separation system 17 includes a gas-liquid separation tower, which is connected to the gas phase outlet 10. The gas-liquid separation tower can be used for atmospheric distillation.

[0036] The separation system 17 includes a packed tower connected to the gas phase outlet 10. The packed tower can be used for negative pressure distillation.

[0037] The base 1 has a controller 28 installed on one side of its top. The controller 28 is electrically connected to the feed pump 5, vacuum pump 24, discharge pump 15, motor 21 and monitoring system 12, which facilitates the control of the overall circuit of the device.

[0038] The working principle of this embodiment is as follows: When using the scraped-film evaporator for distilling imidacloprid oil layer wastewater at atmospheric pressure, the operator first checks whether each component of the device is normal, ensuring that there is a certain amount of imidacloprid oil layer wastewater to be treated in the feed tank 3, checking whether the feed pump 5 is working properly, and confirming that the level gauge reading is accurate. After the checks are completed, the operator preheats the heating jacket 13 of the evaporator 2 to a suitable temperature (vapor phase temperature 95℃). At the same time, the temperature and pressure monitoring system is turned on to monitor the temperature and pressure changes at various points in real time. Then, the feed pump 5 is turned on, and the imidacloprid oil layer wastewater is slowly added to the evaporator 2 at the set flow rate (about 100L / h). During the feeding process, the level of the feed tank 3 is carefully observed. Changes in water level require timely replenishment of wastewater. After the material enters evaporator 2, it is gradually heated and evaporated under the action of heating jacket 13. Due to the high temperature of atmospheric distillation, DMF is easily distilled off from the water. At this time, it is necessary to closely monitor the situation at the gas phase outlet 10. When the gaseous substance is discharged from the gas phase outlet 10, it should be collected using a pre-prepared collection container. During the collection process, the collected fore fraction should be weighed and analyzed periodically, and the weight of the fore fraction (weight of the fore fraction in this atmospheric distillation: 3.7 kg, percentage: 56.5%) and the content of components such as DMF, ethanol, and dichloroethane (normalized: DMF / ethanol / dichloroethane = 7.91 / 0.59 / 0.25) should be recorded. At the same time, the condition of the residual liquid at the liquid phase outlet 11 should be observed. Once the residual liquid reaches a certain volume or the distillation process reaches the predetermined time, feeding and heating are stopped, and feed pump 5 and heating jacket 13 are shut off. After the temperature inside evaporator 2 drops to a suitable level, the residual liquid is released and further processed. After atmospheric distillation is completed, the operator cleans and inspects evaporator 2 to ensure there are no residual substances or malfunctions. Then, the vacuum assembly is started, and the vacuum pump 24 and related valves are gradually adjusted to achieve a vacuum of approximately 0.05 MPa inside evaporator 2. The temperature and pressure monitoring system is checked again to ensure it is working properly and can accurately reflect the temperature and pressure changes inside evaporator 2. Then, the material after atmospheric distillation (or directly the imidacloprid oil layer wastewater) is added to evaporator 2 through feed pump 5 for negative pressure distillation. During distillation, the feed flow rate should be controlled at approximately 100 L / h. Close attention should be paid to the changes in the feed temperature (45℃ in this negative pressure distillation) and the vapor phase temperature (40-55℃ in this negative pressure distillation). As distillation proceeds, observe the vapor outlet 10 and the feed status. If imidazoline crystals appear to precipitate from the feed water layer at evaporator 2 (e.g., imidazoline crystals precipitated in the feed water layer in the first experiment, and crystallization occurred in the second experiment at a lower feed temperature), timely measures should be taken. For example, the imidazoline can be crystallized and removed before the first distillation. Then, the staff can collect the fore fraction and the middle fraction separately (e.g., in this negative pressure distillation, the fore fraction weight was 4.5 kg, accounting for 27%; the middle fraction weight was 7 kg).35kg (42%) was collected and weighed and analyzed promptly. The contents of DMF, ethanol, dichloroethane, etc. in the first and middle fractions were recorded. When the distillation process reached the predetermined time or a sufficient amount of fraction was collected, the feed was stopped, and the vacuum and temperature in evaporator 2 were maintained for a period of time to fully distill off the residual volatile substances. Then, the vacuum components and heating jacket 13 were turned off. After the temperature and pressure in evaporator 2 returned to normal pressure, the residual liquid was released for treatment. After the first-stage negative pressure distillation was completed, evaporator 2 was cleaned and inspected again to ensure that there were no impurities or damage. Then, the middle fraction collected from the first-stage negative pressure distillation (or the material that needs further processing) was added to evaporator 2 through feed pump 5 for the second-stage negative pressure distillation. The operator started the vacuum components to maintain the vacuum in evaporator 2 at about 0.05MPa and controlled the feed flow rate at about 100L / h. At the same time, the feeding temperature was closely monitored. For example, in this negative pressure distillation, the feed temperature (55-60℃) and vapor phase temperature (50-55℃) should be monitored to ensure the temperature remains stable within a suitable range. Finally, the middle fraction of the second-stage negative pressure distillation (weighing 2.75 kg, accounting for 16%) should be collected, and its weight and composition should be recorded and analyzed (normalized ratio: DMF / ethanol / dichloroethane = 2.17 / 1.71 / 0.18). When the DMF content of the middle fraction increases to a certain level (it is recommended to control the DMF content of the middle fraction below 1.2%), a 2-3m packed column can be added at the vapor phase outlet 10 for simple separation to improve the quality of the middle fraction. After the distillation process is completed, follow the same operating procedures as before: stop feeding, maintain the vacuum and temperature in evaporator 2 for a period of time, then shut off the vacuum components and heating jacket 13. After the temperature and pressure in evaporator 2 return to normal, release the residual liquid for further processing.

[0039] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A scraped-film evaporator for distilling wastewater from imidacloprid oil layers, comprising a base (1) and an evaporator (2), characterized in that: A feed tank (3) is installed on one side of the top of the base (1), and a feed pipe (4) is installed on one side of the feed tank (3). A feed pump (5) is installed at one end of the feed pipe (4), and the other end of the feed pipe (4) is connected to the evaporator (2). The evaporator (2) includes an evaporation cylinder (6), a central rotating shaft (7), several scraper blades (8), a steam inlet (9), a gas phase outlet (10), a liquid phase outlet (11), and a drive assembly. The evaporation cylinder (6) is installed at the top of the base (1), and the central rotating shaft (7) is installed inside the evaporation cylinder (6) through a bearing seat. The scraper blades (8) are equidistantly installed on the periphery of the central rotating shaft (7). The steam inlet (9) is located at the middle position on one side of the evaporation cylinder (6). The gas phase outlet (10) is located at the top of one side of the evaporation cylinder (6), and the liquid phase outlet (11) is located at the bottom of the evaporation cylinder (6). Both the gas phase outlet (10) and the liquid phase outlet (11) are equipped with a monitoring system (12). The evaporation cylinder (6) is equipped with a heating jacket (13). The bottom of the liquid phase outlet (11) is equipped with a discharge pipe (14). One end of the discharge pipe (14) is equipped with a discharge pump (15). The top of the base (1) is equipped with a collection bucket (16) located at one end of the discharge pipe (14). One side of the gas phase outlet (10) is connected to a separation system (17) through a pipe. One side of the top of the base (1) is equipped with a vacuum assembly, and the vacuum assembly is connected to the evaporation cylinder (6).

2. The scraped-film evaporator for distilling wastewater from imidacloprid oil layers as described in claim 1, characterized in that: The drive assembly includes a housing (18), a first driven bevel gear (19), and a transmission rod (20). The housing (18) is installed on one side of the top of the evaporator shell (6). A motor (21) is installed inside the housing (18). The output end of the motor (21) is connected to a driving bevel gear (22) via a coupling. The first driven bevel gear (19) is installed at the top of the central rotating shaft (7). The transmission rod (20) is rotatably installed inside the housing (18) via a bearing seat. A pair of second driven bevel gears (23) are symmetrically installed at both ends of the transmission rod (20), and the pair of second driven bevel gears (23) are respectively meshed with the driving bevel gear (22) and the first driven bevel gear (19).

3. The scraped-film evaporator for distilling wastewater from imidacloprid oil layers as described in claim 1, characterized in that: The monitoring system (12) includes two pairs of temperature sensors and pressure sensors.

4. The scraped-film evaporator for distilling wastewater from imidacloprid oil layers as described in claim 1, characterized in that: The vacuum assembly includes a vacuum pump (24), a vacuum buffer tank (25), two vacuum pipes (26), and a control valve (27). The vacuum pump (24) is installed on one side of the top of the base (1). The vacuum buffer tank (25) is installed on the top of the base (1) near the vacuum pump (24). The two vacuum pipes (26) are respectively installed between the vacuum pump (24) and the vacuum buffer tank (25) and between the vacuum buffer tank (25) and the evaporator (6). The control valve (27) is installed at one end of one of the vacuum pipes (26) for connecting the vacuum buffer tank (25) and the evaporator (6).

5. The scraped-film evaporator for distilling wastewater from imidacloprid oil layers as described in claim 1, characterized in that: The separation system (17) includes a gas-liquid separation tower connected to the gas phase outlet (10).

6. The scraped-film evaporator for distilling wastewater from imidacloprid oil layers as described in claim 1, characterized in that: The separation system (17) includes a packed tower connected to the gas phase outlet (10).

7. The scraped-film evaporator for distilling wastewater from imidacloprid oil layers as described in claim 1, characterized in that: A controller (28) is installed on one side of the top of the base (1).

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