A plasma Chinese medicinal material pesticide residue treatment device

Abstract

The present invention belongs to the field of low-temperature plasma technology, and particularly relates to a plasma Chinese herbal medicine pesticide residue treatment device, comprising a cleaning frame, a hollow structure air suction chamber and an exhaust gas treatment chamber are arranged in the cleaning frame, and a fan is installed between the two; the exhaust gas treatment chamber is filled with activated carbon and manganese dioxide catalyst, a ceramic plate is arranged on the bottom plate of the air suction chamber, and a first electrode plate is attached to the ceramic plate; below the ceramic plate, an insulating plate is arranged, and a second electrode plate is attached to the insulating plate, and the first electrode plate and the second electrode plate are connected to the high-voltage output end and the ground output end of the plasma power supply through a wire; the space between the first electrode plate and the second electrode plate is a plasma generation area. Under the action of the electric field, the air in the plasma generation area is excited into high-energy plasma, generating active substances, and the chemical bonds of organic matter in the pesticide residues will be broken under the high-voltage electric field, and react with the active substances, and finally generate carbon dioxide and water molecules, so as to achieve the removal of pesticide residues.

Description

Technical Field

[0001] The invention belongs to the technical field of low-temperature plasma, and in particular relates to a plasma Chinese medicinal material pesticide residue treatment device. Background Art

[0002] Common pesticides used in the production of Chinese herbal medicines include organochlorine, organophosphorus, pyrethroids and carbamates. Pesticide residues not only affect their medicinal effects, but also accumulate in the human body and cause new diseases. At present, in order to control pesticide residues in Chinese herbal medicines, it is usually adopted to reduce the use of chemical pesticides and add biological and physical control methods. However, it is still impossible to avoid the use of pesticides, and the problem of pesticide residues still exists.

[0003] Based on this, the present invention introduces a technology for treating Chinese medicinal materials using low-temperature plasma, which can effectively degrade them. Summary of the invention

[0004] In view of the problem of pesticide residues in the prior art, the present invention provides a plasma Chinese medicinal material pesticide residue treatment device to degrade the pesticide residues in the Chinese medicinal materials.

[0005] The present invention is achieved through the following technical solutions:

[0006] A plasma Chinese medicinal material pesticide residue treatment device comprises a conveying device, on which a cleaning frame is fixed;

[0007] A rectangular air suction bin is fixed at the lower part of the cleaning frame, and an exhaust gas treatment bin is fixed above the air suction bin. The air suction bin and the exhaust gas treatment bin are hollow structures, and a fan is installed between the air suction bin and the exhaust gas treatment bin; the exhaust gas treatment bin is filled with activated carbon and manganese dioxide catalyst, and the two air outlets of the exhaust gas treatment bin correspond to the openings on the two side panels of the cleaning frame;

[0008] A mounting groove is provided on the bottom plate of the air suction bin, a ceramic plate is installed in the mounting groove, and a first electrode plate is attached to a side of the ceramic plate away from the conveyor belt; the first electrode plate is connected to the high-voltage output end of the plasma power supply through a wire;

[0009] An insulating plate is fixed in the cleaning frame below the ceramic plate, and a second electrode plate is attached to a side of the insulating plate close to the conveyor belt, and the second electrode plate is connected to the ground output terminal of the plasma power supply through a wire;

[0010] The first electrode plate is located above the conveyor belt of the conveyor device, the second electrode plate is located below the conveyor belt of the conveyor device, and the space between the first electrode plate and the second electrode plate is a plasma generating area.

[0011] Furthermore, the first electrode plate and the second electrode plate are arranged in a staggered manner with a staggered distance of 10 to 20 mm. The first electrode plate and the second electrode plate are arranged in a staggered manner with a staggered distance of 10 to 20 mm. The staggered arrangement can make the electric field distribution more uniform, and improve the electric field strength between the electrode plates, thereby forming a more stable, more uniform, and more concentrated plasma region in the gap between the electrode plates. The stronger electric field can promote molecular cracking and the generation of active substances, so that the active components of the plasma can act evenly on the surface of the Chinese medicinal materials, increase the chance of contact between the pesticide residue and the plasma, and help improve the removal efficiency of the pesticide residue. At the same time, it can also avoid the unstable arc discharge phenomenon between the electrode plates, and reduce the risk of arc damage caused by excessive local current.

[0012] Furthermore, a cylindrical discharge wire with a diameter of 0.2 to 1 mm and made of stainless steel is embedded on the bottom surface of the ceramic plate. As a part of the electrode, the cylindrical discharge wire can effectively concentrate the electric field and form a strong ionization area around it. The small diameter of the discharge wire helps to enhance the electric field strength, making the generation of plasma more concentrated and efficient.

[0013] Furthermore, on one side of the second electrode plate, a front conductive plate is provided on the insulating plate, the horizontal distance between the front conductive plate and the center of the discharge wire is 0-10 mm, and the vertical distance between the center of the discharge wire and the upper end surface of the front conductive plate is 10-20 mm. Reasonable distance design helps to balance the discharge intensity, ensures a reasonable electric field distribution in the discharge area, optimizes the discharge path of the plasma, avoids arc damage caused by local excessive discharge, and ensures stable plasma discharge effect in the entire processing area.

[0014] Furthermore, when the device is running, the high-voltage DC power supply and the plasma power supply are turned on at the same time, and the voltage of the high-voltage DC power supply is 2-4KV higher than that of the plasma power supply. High-voltage DC power supply connection: The discharge wire is connected to the positive electrode of the high-voltage DC power supply, which can generate a high-energy electron flow, while the front conductive plate is connected to the negative electrode, which helps to form a strong electric field. This high voltage difference makes the plasma generated between the discharge wire and the front conductive plate more stable and efficient, and improves the decomposition ability of pesticide residues.

[0015] In the present invention, a discharge wire and a front conductive plate are provided. When the discharge wire is connected to the front conductive plate and a high-voltage DC power supply, the discharge wire and the front conductive plate are discharged first due to the high voltage of the high-voltage DC power supply, and the air is activated into plasma, which is quickly diffused to the first electrode plate and the second electrode plate area under the drive of the conveyor belt. The plasma power supply can maintain discharge at a relatively low voltage, increase the concentration of active gas, and prolong the processing time of Chinese medicinal materials in the plasma area.

[0016] The discharge wire driven by the high-voltage DC power supply has a small diameter. Although a high voltage is applied, the input energy is low and will not damage the medicinal materials themselves. The first and second electrode plates driven by the plasma power supply maintain discharge at a low voltage and process the medicinal materials in a large area covered by the first and second electrode plates, ensuring that the medicinal materials themselves are not damaged and increasing the processing efficiency.

[0017] Furthermore, a plurality of suction holes are evenly distributed on the bottom plate of the suction bin. A plurality of suction holes can prevent the airflow from being concentrated in a certain part, causing excessive or uneven local suction, thereby ensuring smooth airflow in the entire cleaning area and improving the stability and consistency of the treatment process. The uniform distribution of the suction holes can evenly guide the air into the suction bin, making the airflow distribution more uniform; it helps to optimize the air flow path, making the airflow entering the exhaust treatment bin more uniform and efficient. A more uniform airflow can improve the adsorption and treatment efficiency of harmful substances in the exhaust gas (such as odor, volatiles, etc.) and prevent exhaust gas leakage.

[0018] Furthermore, the first electrode plate and the second electrode plate are made of stainless steel. The discharge wire made of stainless steel has good high temperature resistance and corrosion resistance, can work stably for a long time under high voltage current, and is not easily oxidized or damaged.

[0019] Furthermore, an air outlet is provided on the top plate of the air suction bin, and an air inlet is provided on the bottom plate of the exhaust gas treatment bin. The air outlet is connected to the inlet of the fan, and the air inlet is connected to the outlet on the fan.

[0020] Furthermore, the conveying device includes a conveyor belt and a fixed frame, a motor is fixed at one end of the fixed frame, the output end of the motor is connected to the first transmission shaft through a gear assembly, the transmission shaft is connected to the second transmission shaft through a gear assembly, and the first transmission shaft and the second transmission shaft are provided with a conveyor belt.

[0021] Furthermore, the cleaning frame is mounted on the fixed frame, and curtains are provided at the front and rear of the cleaning frame. The function of the curtains is to optimize the removal effect of pesticide residues, improve equipment efficiency, ensure stable operation of equipment, and enhance the safety and comfort of the overall environment by limiting airflow, concentrating the cleaning area, improving operation safety, and preventing pollutants from leaking out.

[0022] Beneficial technical effects of the present invention:

[0023] (1) Under the action of the electric field, the oxygen, nitrogen and water vapor in the air in the plasma generation area can be excited into high-energy plasma, generating a large number of active oxygen atoms, H2O2, NO X, hydroxyl free radicals and other active substances. At the same time, the chemical bonds of organic substances such as esters and formates in the pesticide residues contained in the medicinal materials will be broken under the high voltage electric field, and react with the active substances to eventually generate carbon dioxide and water molecules, thereby achieving the removal of pesticide residues in Chinese medicinal materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the cleaning frame;

[0026] Figure 3 It is a schematic diagram of the structure of the cleaning frame;

[0027] Figure 4 A front view of a first electrode plate and a second electrode plate portion;

[0028] In the figure: 1. conveying device, 2. cleaning frame, 3. suction chamber, 4. exhaust gas treatment chamber, 5. fan, 6. opening, 7. mounting groove, 8. ceramic plate, 9. first electrode plate, 10. insulating plate, 11. second electrode plate, 12. discharge wire, 13. front conductive plate, 14. suction hole, 15. conveyor belt, 16. fixed frame, 17. curtain. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] See also Figure 1-4 A plasma Chinese medicinal material pesticide residue treatment device includes a conveying device 1, the conveying device 1 includes a conveyor belt 15 and a fixed frame 16, a motor is fixed to one end of the fixed frame 16, the output end of the motor is connected to a first transmission shaft through a gear assembly, the transmission shaft is connected to a second transmission shaft through a gear assembly, and the first transmission shaft and the second transmission shaft are provided with a conveyor belt 15.

[0031] The fixed frame 16 is fixed with a cleaning frame 2, which is an "inverted concave" structure. The side wall of the cleaning frame 2 is provided with an opening 6. A rectangular suction chamber 3 is fixed at the bottom of the cleaning frame 2, and a plurality of suction holes 14 are provided on the bottom plate of the suction chamber 3. An exhaust gas treatment chamber 4 is fixed above the suction chamber 3. The suction chamber 3 and the exhaust gas treatment chamber 4 are hollow structures, and a fan 5 is installed between the suction chamber 3 and the exhaust gas treatment chamber 4; a mounting plate is provided between the suction chamber 3 and the exhaust gas treatment chamber 4, and a fan 5 is fixed on the mounting plate. An air outlet is provided on the top plate of the suction chamber 3, and an air inlet is provided on the bottom plate of the exhaust gas treatment chamber 4. The air outlet is connected to the inlet of the fan 5, and the air inlet is connected to the outlet on the fan 5. The exhaust gas treatment chamber 4 is filled with activated carbon and manganese dioxide catalyst, and the two air outlets of the exhaust gas treatment chamber 4 correspond to the openings 6 on the two side plates of the cleaning frame 2.

[0032] In this embodiment, activated carbon is filled at the bottom of the tail gas treatment chamber 4 to form an adsorption layer of a certain thickness. After the tail gas enters the tail gas treatment chamber, it first contacts the activated carbon to adsorb most of the harmful gases therein. A manganese dioxide catalyst layer is installed above the activated carbon layer (or at the rear of the tail gas flow direction) to catalyze the oxidizing gas or volatile organic matter in the tail gas to further purify the tail gas.

[0033] The bottom plate of the suction bin 3 is provided with a mounting groove 7, in which a ceramic plate 8 is installed, and a first electrode plate 9 is applied to the side of the ceramic plate 8 away from the conveyor belt 15; the first electrode plate 9 is connected to the high-voltage output end of the plasma power supply through a wire; below the ceramic plate 8, an insulating plate 10 is fixed in the cleaning frame 2, and a second electrode plate 11 is applied to the side of the insulating plate 10 close to the conveyor belt 15, and the second electrode plate 11 is connected to the ground output end of the plasma power supply through a wire. The first electrode plate 9 and the second electrode plate 11 are made of stainless steel. The first electrode plate 9 is located above the conveyor belt 15, and the second electrode plate 11 is located below the conveyor belt 15. The space between the first electrode plate 9 and the second electrode plate 11 is the plasma generation area.

[0034] In this embodiment, the first electrode plate 9 and the second electrode plate 11 are arranged in a staggered manner, and the staggered distance is 10-20 mm. The staggered arrangement can make the electric field distribution more uniform, and improve the electric field strength between the electrode plates, so as to form a more stable, more uniform, and more concentrated plasma area in the gap between the electrode plates. The stronger electric field can promote molecular decomposition and the generation of active substances, so that the active components of the plasma can act evenly on the surface of the Chinese medicinal materials, increase the chance of contact between the pesticide residue and the plasma, and help improve the removal efficiency of the pesticide residue. At the same time, it can also avoid the unstable arc discharge phenomenon between the electrode plates, and reduce the risk of arc damage caused by excessive local current.

[0035] A cylindrical discharge wire 12 with a diameter of 0.2-1 mm and made of stainless steel is embedded on the bottom surface of the ceramic plate 8. On one side of the second electrode plate 11, a front conductive plate 13 is provided on the insulating plate 10. The horizontal distance between the front conductive plate 13 and the center of the discharge wire 12 is 0-10 mm, and the vertical distance between the center of the discharge wire 12 and the upper end surface of the front conductive plate 13 is 10-20 mm. The discharge wire 12 is connected to the positive pole of the high-voltage DC power supply, and the front conductive plate 13 is connected to the negative pole of the high-voltage DC power supply.

[0036] In this embodiment, a discharge wire 12 and a front conductive plate 13 are provided. When the discharge wire 12, the front conductive plate 13 and the high-voltage DC power supply are connected, the discharge wire 12 and the front conductive plate 13 are discharged first due to the high voltage of the high-voltage DC power supply, and the air is activated into plasma, which is quickly diffused to the first electrode plate 9 and the second electrode plate 11 area driven by the conveyor belt. The plasma power supply can maintain discharge at a relatively low voltage, increase the concentration of the active gas, and prolong the processing time of the Chinese medicinal materials in the plasma area.

[0037] The discharge wire 12 driven by the high-voltage DC power supply has a small diameter. Although a high voltage is applied, the input energy is low and the medicinal material itself will not be damaged. The first electrode plate 9 and the second electrode plate 11 driven by the plasma power supply maintain discharge at a low voltage and process the medicinal material in a large area covered by the first electrode plate 9 and the second electrode plate 11, ensuring that the medicinal material itself is not damaged and increasing the processing efficiency.

[0038] In this embodiment, the cleaning frame 2 is mounted on the fixed frame 16, and a curtain 17 is provided at the front and rear of the cleaning frame 2. The function of the curtain 17 is to optimize the removal effect of pesticide residues, improve equipment efficiency, ensure stable operation of equipment, and enhance the safety and comfort of the overall environment by limiting airflow, concentrating the cleaning area, improving operation safety, and preventing pollutants from leaking out.

[0039] In this embodiment, a plurality of suction holes 14 are evenly distributed on the bottom plate of the suction bin 3. A plurality of suction holes 14 can prevent the airflow from being concentrated in a certain part, causing excessive or uneven local suction, thereby ensuring smooth airflow in the entire cleaning area and improving the stability and consistency of the treatment process. The uniform distribution of the suction holes 14 can evenly guide the air into the suction bin 3, making the airflow distribution more uniform; it helps to optimize the air flow path, making the airflow entering the exhaust treatment bin 4 more uniform and efficient. A more uniform airflow can improve the adsorption and treatment efficiency of harmful substances (such as odor, volatiles, etc.) in the exhaust gas and prevent leakage of the exhaust gas.

[0040] Working principle of the present invention:

[0041] The crushed medicinal materials are transported to the plasma generation area through the conveyor belt 15, and the plasma generation area is the area between the first electrode plate 9 and the second electrode plate 11. When the first electrode plate 9 and the second electrode plate 11 are connected to the plasma power supply, the plasma power supply outputs a high-frequency alternating voltage of 6KV to 20KV, and a high-voltage electric field will be generated in the plasma generation area.

[0042] Under the high voltage electric field, oxygen, nitrogen and water vapor in the air in the plasma generation area are excited into high energy plasma, generating a large number of active oxygen atoms, H2O2, NO X , hydroxyl free radicals and other active substances. At the same time, the chemical bonds of organic substances such as esters and formates in the pesticide residues contained in the medicinal materials will be broken under the high voltage electric field, and react with the active substances to eventually generate carbon dioxide and water molecules, thereby achieving the removal of pesticide residues in Chinese medicinal materials.

[0043] While the device is working, the treated exhaust gas is sucked into the exhaust gas treatment bin 4 through the suction hole 14 of the suction bin 3 under the action of the fan 5, and the unreacted active substances contained in the exhaust gas react with the activated carbon and the manganese dioxide catalyst in the exhaust gas treatment bin 4 to achieve pollution-free discharge.

Claims

1. A plasma Chinese medicinal material pesticide residue treatment device, characterized in that: It comprises a conveying device (1), on which a cleaning frame (2) is fixed; A rectangular air suction bin (3) is fixed at the lower part of the cleaning frame (2), and an exhaust gas treatment bin (4) is fixed above the air suction bin (3); the air suction bin (3) and the exhaust gas treatment bin (4) are hollow structures, and a fan (5) is installed between the air suction bin (3) and the exhaust gas treatment bin (4); activated carbon and manganese dioxide catalyst are installed in the exhaust gas treatment bin (4), and two air outlets of the exhaust gas treatment bin (4) correspond to openings (6) on two side panels of the cleaning frame (2); A mounting groove (7) is provided on the bottom plate of the air suction bin (3), a ceramic plate (8) is installed in the mounting groove (7), and a first electrode plate (9) is attached to a side of the ceramic plate (8) away from the conveyor belt (15); the first electrode plate (9) is connected to a high-voltage output terminal of a plasma power supply via a wire; An insulating plate (10) is fixed in the cleaning frame (2) below the ceramic plate (8); a second electrode plate (11) is attached to a surface of the insulating plate (10) close to the conveyor belt (15); the second electrode plate (11) is connected to a ground output terminal of a plasma power supply via a wire; The first electrode plate (9) is located above a conveyor belt (15) of the conveyor device (1), the second electrode plate (11) is located below the conveyor belt (15) of the conveyor device (1), and the space between the first electrode plate (9) and the second electrode plate (11) is a plasma generating area.

2. The plasma Chinese medicinal material pesticide residue treatment device according to claim 1, characterized in that: The first electrode plates (9) and the second electrode plates (11) are arranged in a staggered manner, with a staggered distance of 10 to 20 mm.

3. The plasma Chinese medicinal material pesticide residue treatment device according to claim 2, characterized in that: A cylindrical discharge wire (12) is embedded on the bottom surface of the ceramic plate (8), and a front conductive plate (13) is provided on the insulating plate (10) on one side of the second electrode plate (11). The discharge wire (12) is connected to the positive electrode of the high-voltage DC power supply, and the front conductive plate (13) is connected to the negative electrode of the high-voltage DC power supply.

4. The plasma Chinese medicinal material pesticide residue treatment device according to claim 3 is characterized in that: The discharge wire (12) has a diameter of 0.2-1 mm and is made of stainless steel.

5. The plasma Chinese medicinal material pesticide residue treatment device according to claim 3 is characterized in that: The horizontal distance between the center of the front conductive plate (13) and the discharge wire (12) is 0 to 10 mm, and the vertical distance between the center of the discharge wire (12) and the upper end surface of the front conductive plate (13) is 10 to 20 mm.

6. The plasma Chinese medicinal material pesticide residue treatment device according to claim 1, characterized in that: A plurality of air suction holes (14) are provided on the bottom plate of the air suction bin (3).

7. The plasma Chinese medicinal material pesticide residue treatment device according to claim 1, characterized in that: The first electrode plate (9) and the second electrode plate (11) are made of stainless steel.

8. The plasma Chinese medicinal material pesticide residue treatment device according to claim 1, characterized in that: An air outlet is provided on the top plate of the air suction chamber (3), an air inlet is provided on the bottom plate of the exhaust gas treatment chamber (4), the air outlet is connected to the inlet of the fan (5), and the air inlet is connected to the outlet on the fan (5).

9. The plasma Chinese medicinal material pesticide residue treatment device according to claim 1, characterized in that: The conveying device (1) comprises a conveyor belt (15) and a fixed frame (16); a motor is fixed to one end of the fixed frame (16); an output end of the motor is connected to a first transmission shaft via a gear assembly; the first transmission shaft is connected to a second transmission shaft via a gear assembly; and the conveyor belt (15) is provided on the first transmission shaft and the second transmission shaft.

10. The plasma Chinese medicinal material pesticide residue treatment device according to claim 1, characterized in that: The cleaning frame (2) is clamped on the fixed frame (16), and barrier curtains (17) are provided at the front and rear of the cleaning frame (2).

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