Waste gas recovery treatment device for pesticide intermediate production

Abstract

The utility model belongs to the technical field of chemical production waste gas treatment, and particularly discloses a waste gas recovery treatment device for pesticide intermediate production, which comprises a treatment box and a fan, a liquid collecting hopper is connected to the bottom end of the treatment box, and a liquid outlet pipeline is arranged at the lower end of the liquid collecting hopper and communicated with a recovery barrel. A gas inlet is formed in the lower end of the treatment box and communicated with a waste gas inlet pipeline, an exhaust pipeline is fixedly connected to the top end of the treatment box, the fan is installed on the exhaust pipeline, a partition plate inclining downwards is arranged in the treatment box and located above the gas inlet, and a breathable supporting plate fixedly connected to the inner wall of the treatment box is arranged above the partition plate. And an activated carbon layer is filled between the breathable supporting plates. The partition plate and the activated carbon layer are arranged in the treatment box, organic waste gas sequentially passes through the partition plate and the activated carbon layer after entering the treatment box, the partition plate condenses and recycles organic solvents in the waste gas, the activated carbon layer adsorbs, purifies and removes harmful components, resource waste in the organic waste gas treatment process is reduced, and the production cost of pesticide intermediates is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment in chemical production, in particular to a waste gas recovery and treatment device for the production of pesticide intermediates. Background Art

[0002] The synthesis and preparation of pesticide intermediates is an important link in the pesticide production process. Pesticide intermediates are products processed from pesticide raw materials. They are intermediate media that combine two or more substances together. They can also be understood as pesticide synergists or intermediate materials for producing pesticides. They have specific chemical structures and functions, and can be ultimately converted into pesticide preparations through methods such as synthesis and modification. There are many types of pesticide intermediates. According to their chemical structure and use, they can be divided into different types such as insecticide, fungicide and herbicide intermediates. These intermediates play a vital role in the pesticide manufacturing process and are indispensable raw materials for pesticide manufacturing. When pesticide intermediates are produced in the workshop, low-concentration organic waste gas will inevitably be generated. These waste gas components are composed of volatile organic solvents and organic compounds in the raw materials. If they are not collected and treated, they will have a certain impact on the operating environment of the workshop workers and the factory environment. The existing waste gas treatment devices directly treat the waste gas and cannot recover the volatile organic solvents mixed in the waste gas. Therefore, it is necessary to design a waste gas recovery and treatment device for the production of pesticide intermediates that can recover and reuse volatile organic solvents in the waste gas. Utility Model Content

[0003] In view of the above technical problems, the utility model provides a waste gas recovery and treatment device for the production of pesticide intermediates, which can recycle volatile organic solvents in the waste gas, so as to solve the problem that the existing waste gas treatment devices directly treat the waste gas but cannot recycle the volatile organic solvents therein, resulting in waste of resources.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a waste gas recovery and treatment device for the production of pesticide intermediates, including a treatment box and a fan, the bottom end of the treatment box is fixedly connected to a liquid collecting bucket, the lower end of the liquid collecting bucket is fixedly connected to a liquid outlet pipe with a liquid outlet valve installed, the liquid outlet pipe is connected to a recovery bucket, the bottom end of the liquid collecting bucket is fixedly connected to a supporting foot, an air inlet is opened on one side of the lower end of the treatment box, the air inlet is connected to the waste gas inlet pipe, the top of the treatment box is fixedly connected to an exhaust pipe, the fan is installed on the exhaust pipe, the two sides of the treatment box are staggered and fixedly connected with downwardly inclined partitions above the air inlet, and a breathable support plate is fixedly connected above the partition in the treatment box, and an activated carbon layer is arranged on the breathable support plate.

[0005] Furthermore, a serpentine circulation pipe is arranged inside the partition, and a water supply pipe and a return pipe are arranged on both sides of the outside of the treatment box. Both ends of the circulation pipe pass through the treatment box and are respectively connected with the water supply pipe and the return pipe. The water supply pipe is connected to the output end of the cooling water tank through a liquid supply pump, and the return pipe is connected to the input end of the cooling water tank.

[0006] Furthermore, a maintenance door is hinged on the processing box at a position corresponding to the activated carbon layer, and a sealing strip is installed around the maintenance door.

[0007] Furthermore, a harmful gas detector is installed on the exhaust duct, and the upper end of the exhaust duct is respectively connected to an external exhaust duct and an internal circulation duct through a three-way joint, the other end of the external exhaust duct is connected to the chimney, and the other end of the internal circulation duct passes through the processing box and is connected to the bottom of the breathable support plate. A first solenoid valve is installed on the external exhaust duct, and a second solenoid valve is installed on the internal circulation duct. The harmful gas detector is communicatively connected to the controller, and the first solenoid valve and the second solenoid valve are both controlled by the controller.

[0008] Compared with the prior art, the utility model has the following advantages:

[0009] 1. The utility model arranges a partition and an activated carbon layer in a treatment box. After the organic waste gas enters the treatment box, it passes through the partition and the activated carbon layer in sequence. The partition condenses and recovers the volatile organic solvent in the waste gas through condensation. The recovered waste gas is adsorbed and purified by the activated carbon layer to remove harmful components before being discharged. The organic waste gas is processed step by step, and the recovered organic solvent can be put into use again after simple processing, which reduces the waste of resources in the organic waste gas treatment process and saves the production cost of pesticide intermediates.

[0010] 2. The utility model can further reduce the temperature of the partition and improve the effect of condensing and recovering volatile organic solvents of the device by arranging a cold water circulation pipe in the partition. By opening a sealable maintenance door on the processing box, when replacing the activated carbon layer, the maintenance door is opened after shutting down, and the maintenance door is closed after taking out and replacing the activated carbon layer, making it more convenient to replace the activated carbon layer. By installing a harmful gas detector on the exhaust pipe and connecting the corresponding controller, as well as adding an internal circulation pipe and the first and second solenoid valves, it can be detected in real time whether the treated gas contains harmful substances. When the harmful gas detector detects that the treated gas contains harmful substances, the controller promptly controls the opening and closing of the first and second solenoid valves to allow the gas to enter the internal circulation pipe, thereby preventing harmful gases from being discharged into the air and polluting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 It is a structural schematic diagram of the circulation pipeline connection inside the partition of the utility model.

[0013] Figure 3 It is a right side view of the external structure of the utility model.

[0014] In the figure: 1. treatment box, 2. fan, 3. liquid collecting bucket, 4. liquid outlet pipe, 5. partition, 6. recovery barrel, 7. support leg, 8. maintenance door, 9. air intake pipe, 10. exhaust pipe, 11. harmful gas detector, 12. breathable support plate, 13. activated carbon layer, 14. circulation pipe, 15. water supply pipe, 16. return pipe, 17. cooling water tank, 18. external discharge pipe, 19. internal circulation pipe, 20. first solenoid valve, 21. second solenoid valve. DETAILED DESCRIPTION

[0015] The utility model will be further described below in conjunction with the accompanying drawings.

[0016] like Figures 1 to 3 The waste gas recovery and treatment device for the production of pesticide intermediates shown in the figure comprises a treatment box 1 and a fan 2. The bottom end of the treatment box 1 is fixedly connected to a liquid collecting hopper 3, which is funnel-shaped. The lower end of the liquid collecting hopper 3 is fixedly connected to a liquid outlet pipe 4, on which a liquid outlet valve is installed. The liquid outlet pipe 4 is connected to a recovery bucket 6 for collecting condensed organic solvent liquid. The bottom end of the liquid collecting hopper 3 is fixedly connected to a supporting foot 7. An air inlet is provided on one side of the lower end of the treatment box 1, and the air inlet is connected to the waste gas inlet pipe 9. The top of the treatment box 1 is fixedly connected to an exhaust pipe 10, and the fan 2 is installed in the exhaust pipe 1. 0, downwardly inclined partitions 5 are arranged on both sides of the processing box 1 above the air inlet, and the partitions 5 on both sides are arranged at intervals. When the organic waste gas contacts the partitions 5, the volatile organic solvent therein condenses and contacts the partitions 5, gradually forming droplets and flowing down. The three adjacent edges of the partitions 5 are fixedly connected to the inner wall of the processing box 1, and a breathable support plate 12 fixedly connected to the inner wall of the processing box 1 is arranged above the partition 5. A plurality of breathable holes are opened on the breathable support plate 12, and an activated carbon layer 13 is arranged above the breathable support plate 12. The activated carbon layer 13 can adsorb and purify harmful components in the gas.

[0017] In order to lower the temperature of the partition 5 and improve the condensation effect of the partition 5, a serpentine circulation pipe 14 is arranged inside the partition 5, and a water supply pipe 15 and a return pipe 16 are arranged on both sides of the outside of the treatment box 1. Both ends of the circulation pipe 14 pass through the treatment box 1 and are respectively connected with the water supply pipe 15 and the return pipe 16. The water supply pipe 15 is connected to the output end of the cooling water tank 17 through a liquid supply pump, and the return pipe 16 is connected to the input end of the cooling water tank 17. The cold water in the cooling water tank 17 is continuously injected into the water supply pipe 15 through the liquid supply pump, and after passing through the circulation pipe 14, the heat of the partition 5 is taken away, enters the return pipe 16, and returns to the cooling water tank for cooling and standby use.

[0018] In order to facilitate the replacement of the activated carbon layer 13, a maintenance door 8 is hingedly connected to the processing box 1 at a position corresponding to the activated carbon layer 13, a sealing strip is installed around the maintenance door 8, and a lock is also installed on the maintenance door 8.

[0019] In order to ensure that the treated gas meets the emission standards, a harmful gas detector 11 is installed on the exhaust pipe 10. The upper end of the exhaust pipe 10 is connected to an external exhaust pipe 18 and an internal circulation pipe 19 through a three-way joint. The other end of the external exhaust pipe 18 is connected to the chimney, and the other end of the internal circulation pipe 19 passes through the treatment box 1 and is connected to the bottom of the breathable support plate 12. A first solenoid valve 20 is installed on the external exhaust pipe 18, and a second solenoid valve 21 is installed on the internal circulation pipe 19. The harmful gas detector 11 is communicatively connected with the controller. The first solenoid valve 20 and the second solenoid valve 21 are both controlled by the controller. The controller is installed above the outside of the treatment box 1. The harmful gas detector 11 detects in real time whether the treated gas contains harmful substances. When it is detected that the treated gas contains harmful substances, it transmits an electrical signal to the controller. After receiving the electrical signal, the controller promptly controls the first solenoid valve 20 to close and the second solenoid valve 21 to open. At this time, the gas will enter the internal circulation pipe 19 to prevent the harmful gas from continuing to enter the external exhaust pipe 18 and being discharged into the air to pollute the environment.

[0020] The specific working process of the utility model is as follows:

[0021] The organic waste gas generated by the production of pesticide intermediates enters the treatment box 1 through the air intake pipe 9 under the action of the fan 2, and passes through the partition 5 and the activated carbon layer 13 in turn. When passing through the partition 5, the inclined partition 5 will increase the contact time with the organic waste gas. The cold water in the cooling water tank 17 is continuously sent to the water supply pipe 15, and flows through the circulation pipe 14 and the return liquid pipe 16 in turn to flow back to the cooling water tank 17, continuously taking away the heat of the partition 5 and reducing the temperature of the partition 5. The volatile organic solvent in the organic waste gas gradually condenses into small droplets on the partition 5 under the action of condensation, and finally gathers and drips downward, enters the liquid collecting bucket 3 and continuously gathers, opens the liquid outlet valve on the liquid outlet pipe 4, and discharges the collected organic solvent liquid into the recovery barrel 6 for recycling and standby use; the organic waste gas condensed by the partition 5 enters the activated carbon layer 13 through the air permeable holes of the air permeable support plate 12, and the activated carbon layer 13 can adsorb and purify harmful components in the gas. When the activated carbon layer 13 needs to be replaced, the machine is shut down and the maintenance door 8 is opened to take out the activated carbon layer 13 that is saturated with adsorption, replace it with a new activated carbon layer 13, and then the maintenance door 8 is closed and locked, and the machine is turned on. The gas treated by the activated carbon layer 13 enters the exhaust pipe 10, and the harmful gas detector 11 detects in real time whether the treated gas contains harmful components. Finally, the gas that passes the treatment passes through the first solenoid valve 20 and the external exhaust pipe 18 in turn and enters the chimney for discharge; when the harmful gas detector 11 detects that the treated gas contains harmful substances, it transmits an electrical signal to the controller. After receiving the electrical signal, the controller promptly controls the first solenoid valve 20 to close and the second solenoid valve 21 to open. At this time, the gas will enter the internal circulation pipe 19 to prevent the harmful gas from continuing to enter the external exhaust pipe 18 and be discharged into the air to pollute the environment.

Claims

1. A waste gas recovery and treatment device for the production of pesticide intermediates, comprising a treatment box (1) and a fan (2), wherein the bottom end of the treatment box (1) is fixedly connected to a liquid collecting hopper (3), the lower end of the liquid collecting hopper (3) is fixedly connected to a liquid outlet pipe (4) equipped with a liquid outlet valve, the liquid outlet pipe (4) is connected to a recovery bucket (6), the bottom end of the liquid collecting hopper (3) is fixedly connected to a supporting foot (7), an air inlet is provided on one side of the lower end of the treatment box (1), the air inlet is connected to a waste gas inlet pipe (9), the top end of the treatment box (1) is fixedly connected to an exhaust pipe (10), the fan (2) is installed on the exhaust pipe (10), and is characterized in that: Partition plates (5) tilted downward are staggered and fixedly connected on both sides of the processing box (1) above the air inlet, and a breathable support plate (12) is fixedly connected above the partition plates (5) in the processing box (1), and an activated carbon layer (13) is provided on the breathable support plate (12).

2. The waste gas recovery and treatment device for pesticide intermediate production according to claim 1, characterized in that: A serpentine circulation pipe (14) is arranged inside the partition (5), and a water supply pipe (15) and a return pipe (16) are connected to both sides of the outside of the treatment box (1). Both ends of the circulation pipe (14) pass through the treatment box (1) and are respectively connected to the water supply pipe (15) and the return pipe (16). The water supply pipe (15) is connected to the output end of the cooling water tank (17) through a liquid supply pump, and the return pipe (16) is connected to the input end of the cooling water tank (17).

3. The waste gas recovery and treatment device for pesticide intermediate production according to claim 1, characterized in that: A maintenance door (8) is hingedly connected to the processing box (1) at a position corresponding to the activated carbon layer (13), and a sealing strip is installed around the maintenance door (8).

4. The waste gas recovery and treatment device for pesticide intermediate production according to claim 1, characterized in that: A harmful gas detector (11) is installed on the exhaust pipe (10); the upper end of the exhaust pipe (10) is respectively connected to an external exhaust pipe (18) and an internal circulation pipe (19) through a three-way joint; the other end of the external exhaust pipe (18) is connected to a chimney; the other end of the internal circulation pipe (19) passes through the treatment box (1) and is connected to the bottom of the air permeable support plate (12); a first solenoid valve (20) is installed on the external exhaust pipe (18); a second solenoid valve (21) is installed on the internal circulation pipe (19); the harmful gas detector (11) is connected to a controller for communication; the first solenoid valve (20) and the second solenoid valve (21) are controlled by the controller.

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