VOCS adsorption and purification device in traditional Chinese medicine processing process

Abstract

The invention discloses a VOCS adsorption and purification device in the traditional Chinese medicine processing process, and relates to the technical field of waste gas purification devices.The VOCS adsorption and purification device comprises an adsorption mechanism, the adsorption mechanism comprises an adsorption box, a plurality of adsorption tanks are rotatably connected to the interior of the adsorption box, communicating ports are formed in the two ends of each adsorption tank, a first connector set is formed in the adsorption box, and a second connector set is formed in the adsorption box; and when the adsorption tank rotates to the adsorption station, the communication ports at the two ends of the adsorption tank are respectively communicated with the first interface group in a sealing manner. Through the synergistic effect of the Laval pipe and the evaporator, the strong negative pressure generated at the throat end of the Laval pipe is used for driving a medium in the evaporator to evaporate rapidly, then a low-temperature environment is formed, the heat exchange area of the pipe sections of the first air pipe and the third air pipe in the evaporator is increased through the fins, efficient drying pretreatment of to-be-purified gas is achieved, and the energy consumption is reduced. Meanwhile, waste heat recovery of high-temperature airflow is completed, the situation that the adsorption efficiency is reduced due to the fact that water vapor occupies activated carbon adsorption holes in the adsorption tank is avoided, and the energy utilization rate is increased.

Description

Technical Field

[0001] This invention relates to the field of waste gas purification devices, and in particular to a VOCs adsorption and purification device for the processing of traditional Chinese medicine. Background Technology

[0002] VOCs (Volatile Organic Compounds) are a class of organic pollutants that are easily volatile at room temperature, participate in atmospheric photochemical reactions, and pose a direct threat to human health. They are important precursors to ozone pollution and PM2.5, causing significant harm to the atmospheric environment and human health. Therefore, they must undergo strict purification treatment before industrial emissions. Traditional Chinese medicine (TCM) processing is a key process characteristic of TCM, often involving washing, soaking, cutting, stir-frying, roasting, calcining, steaming, and boiling. Under the combined effects of high temperatures, steam, and the volatile components of the medicinal materials themselves, complex VOC emissions are inevitably generated. These VOCs may not only contain common industrial pollutants such as benzene compounds, aldehydes, ketones, and terpenes, but also contain a large number of unique components derived from the medicinal materials themselves and the processing reactions, significantly impacting the atmospheric environment and human health. Adsorption methods, due to their high efficiency and economy, have become the mainstream technology for VOC removal. However, traditional adsorption equipment usually requires manual replacement of saturated adsorption materials periodically, which is not only cumbersome and interrupts the production process, but also prone to secondary pollution if the removed adsorbent is not handled properly. How to achieve online regeneration of adsorption materials and complete harmless treatment of VOCs is a core problem that the industry urgently needs to solve.

[0003] To address the aforementioned issues, existing technologies employ an integrated process of "zeolite rotor adsorption, hot air desorption, and catalytic combustion." This process uses hot air to desorb adsorbed VOCs before sending them to a burner for oxidation and decomposition. While this achieves complete and continuous VOCs treatment, it relies on electric heating to generate the hot airflow, resulting in high energy consumption and low waste heat utilization. Another approach involves a system linking an adsorption tower and a regeneration tower. This system uses steam to desorb and regenerate activated carbon, and utilizes oil-water separation and heat exchange devices to achieve water resource recycling and eliminate the need for manual adsorbent handling. While this solves the cumbersome problem of manual adsorbent replacement, its steam desorption technology is limited by the steam diffusion rate, resulting in low desorption efficiency. Furthermore, the treatment of the desorbed mixture is complex, posing a risk of VOCs residue or leakage. Additionally, it lacks a design for deep, tiered utilization of combustion heat and resource recovery of byproducts. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of high energy consumption and low waste heat utilization in the existing technology of treating VOCs by relying on electric heating to generate hot airflow, and to propose a VOCs adsorption and purification device in the process of processing traditional Chinese medicine.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a VOCs adsorption and purification device for the processing of traditional Chinese medicine, comprising an adsorption mechanism, wherein the adsorption mechanism comprises an adsorption box, wherein multiple adsorption tanks are rotatably connected inside the adsorption box, wherein the adsorption tanks are provided with communication ports at both ends, and the adsorption box is provided with a first interface group, wherein when the adsorption tanks rotate to the adsorption station, the communication ports at both ends are respectively sealed and connected to the first interface group. The first interface group has an air inlet connected to an air pipe two and an air outlet connected to an air outlet pipe. The air inlet of the air pipe two is connected to an air pipe one, and the air inlet of the air pipe one is connected to the air containing VOCs in the traditional Chinese medicine processing plant. It also includes a Laval tube, the inlet end of which is connected to a burner, the throat end of which is connected to an evaporator, and the outlet end of which is connected to a gas pipe. When the burner is working, its outlet end introduces a high-temperature and high-pressure gas flow into the inlet end of the Laval tube. The middle sections of both the first and third gas pipes are sealed and penetrate the cavity of the evaporator, and their condensate outlets are connected to a water collection assembly.

[0006] In the aforementioned VOCs adsorption and purification device for processing traditional Chinese medicine, a motor is installed on one side of the adsorption box. The output end of the motor is sealed through the wall of the adsorption box and is fixedly connected to a mounting frame. The mounting frame is rotatably connected to the inside of the adsorption box. Multiple adsorption tanks can be detachably installed on the mounting frame. An inspection door is installed at the bottom of the adsorption box for allowing the adsorption tanks to enter and exit the adsorption box. The inside of the adsorption tank is filled with activated carbon for adsorbing VOCs.

[0007] In the aforementioned VOCs adsorption and purification device for processing traditional Chinese medicine, an inflatable sealing ring is fixedly connected to the connecting port of the adsorption tank. The inflatable sealing ring is connected to an external inflation and deflation device to control the expansion and contraction of the inflatable sealing ring. When the adsorption tank rotates to the adsorption station, the inflatable sealing rings at both ends are inflated and expanded, so that the two connecting ports are respectively sealed and connected to the first interface group. An air valve is installed on the first interface group to control the flow of air.

[0008] In the VOCs adsorption and purification device in the above-mentioned traditional Chinese medicine processing process, the inlet end of the Laval tube is the high-pressure side, the throat end is the evaporation side, and the outlet end is the low-pressure side. The high-pressure side is connected to the outlet end of the burner, the evaporation side is connected to the outlet end of the evaporator, and the low-pressure side is connected to the inlet end of the gas pipe three. Fins are fixedly connected to the pipe sections of gas pipe one and gas pipe three located inside the evaporator.

[0009] In the VOCs adsorption and purification device in the above-mentioned traditional Chinese medicine processing process, a VOCs concentration monitor is installed inside the outlet pipe to send a feedback signal when the VOCs concentration exceeds a set value. The motor, air valve, air filling and releasing device and VOCs concentration monitor are all electrically connected to a controller. The controller is electrically connected to an alarm. The controller receives the feedback signal from the VOCs concentration monitor and controls the working status of each actuator.

[0010] In the above-mentioned VOCs adsorption and purification device for processing traditional Chinese medicine, the water collection component includes a water collection box. A water tank is fixedly connected to the top of the water collection box for collecting condensate. The water tank is filled with water. The condensate outlets of the first and third air pipes extend into the water inside the water tank. The top of the water tank is connected to the inside of the water collection box. A water pump is installed on the water collection box. The pump's suction end is sealed and extends into the bottom of the water collection box, while its outlet end is connected to a water tank. A water level gauge is installed inside the water collection box. A water pump is installed on the evaporator. The pump's suction end is connected to the bottom of the water tank, and its outlet end is connected to the inside of the evaporator. A water level gauge is installed inside the evaporator. All three pumps (pump 1, pump 2, and pump 2) are electrically connected to a controller. The controller receives signals from each water level gauge and controls the operating status of each pump.

[0011] In the aforementioned VOCs adsorption and purification device for processing traditional Chinese medicine, the adsorption box is provided with a second interface group. When the adsorption tank rotates to the desorption station, the connecting ports at both ends are respectively sealed and connected to the second interface group. The inlet end of the second interface group is connected to a gas pipe seven, and its outlet end is connected to a nitrogen treatment component. The outlet end of the nitrogen treatment component is connected to a gas pipe five, and the outlet end of the gas pipe five is connected to the inlet end of the burner. The inlet end of the gas pipe seven is connected to a heating mechanism. The outlet end of the gas pipe three is connected to multiple branch pipes, which are sealed and pass through the heating mechanism. Heat is conducted through the pipe wall to heat the inside of the heating mechanism. A gas valve two is installed on the second interface group, and the gas valve two is electrically connected to the controller.

[0012] In the aforementioned VOCs adsorption and purification device for processing traditional Chinese medicine, the nitrogen treatment component includes a buffer tank. The inlet of the buffer tank is connected to the outlet of the second interface group, and its outlet is connected to the inlet of the fifth air pipe. The top of the buffer tank is connected to the sixth air pipe. A zeolite membrane is installed at the connection port between the sixth air pipe and the buffer tank for selectively permeating nitrogen and blocking VOCs. The outlet of the sixth air pipe is sequentially connected to a nitrogen pump and a nitrogen tank. The nitrogen pump is used to pressurize the nitrogen introduced through the sixth air pipe into the interior of the nitrogen tank.

[0013] In the aforementioned VOCs adsorption and purification device for processing traditional Chinese medicine, the heating mechanism includes a heating tube, with multiple branch pipes sealingly penetrating the heating tube. A piston is slidably connected inside the heating tube. An electric cylinder is installed on the heating tube, with its output end sealingly penetrating the wall of the heating tube and fixedly connected to the piston. The piston has through holes adapted to the branch pipes, which pass through the through holes and slide in cooperation with the piston. The outer side of the piston is spaced apart from the inner wall of the heating tube. One end of the heating tube near gas pipe three is connected to a nitrogen tank, and the other end is connected to gas pipe seven. A temperature sensor is installed on gas pipe seven. Both the temperature sensor and the electric cylinder are electrically connected to a controller. The controller receives the signal from the temperature sensor and controls the working state of the electric cylinder.

[0014] In the aforementioned VOCs adsorption and purification device for processing traditional Chinese medicine, the outlet of the third gas pipe is connected to the fourth gas pipe, and the outlet of the fourth gas pipe is connected to a carbon dioxide gas treatment component. The carbon dioxide gas treatment component includes a gas collection chamber, the inlet of which is connected to the outlet of the fourth gas pipe, the bottom of which is connected to a gas storage tank, and the top of which is connected to an exhaust pipe. A PI membrane is installed at the connection port between the gas collection chamber and the gas storage tank for selectively permeating carbon dioxide gas. A pressure relief valve is installed inside the exhaust pipe for venting exhaust after the pressure inside the gas collection chamber reaches a set value.

[0015] Compared with existing technologies, the advantages of this invention are: This invention utilizes the synergistic effect of a Laval tube and an evaporator. The strong negative pressure generated at the throat of the Laval tube drives the rapid evaporation of the medium inside the evaporator, thereby creating a low-temperature environment. The sections of gas pipes one and three within the evaporator have fins to increase the heat exchange area, achieving efficient drying pretreatment of the gas to be purified. Simultaneously, it recovers the waste heat of the high-temperature gas flow, avoiding the decrease in adsorption efficiency caused by water vapor occupying the activated carbon adsorption pores in the adsorption tank, and improving energy utilization. At the same time, the VOCs separated by the nitrogen treatment component can be introduced into the burner, where they are decomposed into non-toxic substances under high-temperature conditions. This, combined with the adsorption effect of the adsorption tank, forms a dual purification, enhancing the VOCs purification effect.

[0016] This invention uses a motor-driven mounting frame to rotate multiple adsorption tanks and switch positions. The expansion and contraction of the inflatable sealing rings achieves sealing connection and position switching. Combined with the linkage control of the VOCs concentration monitor and controller, it can quickly switch to a backup adsorption tank when the adsorption tank is saturated or fails. The adsorption tank replacement or desorption operation can be completed without stopping the machine, ensuring the continuous operation of VOCs adsorption and purification during the processing of traditional Chinese medicine and improving the operating efficiency of the device.

[0017] In this invention, heated nitrogen is used as the desorption medium in the desorption process. The nitrogen is heated by the residual heat of the branch pipe in the heating mechanism, and the heating path of the nitrogen is changed by adjusting the piston position of the electric cylinder to achieve precise adaptation of the desorption temperature. After being separated by a zeolite membrane, the nitrogen is returned to the nitrogen tank for recycling, while VOCs are fed into the burner for high-temperature pyrolysis and harmless treatment, forming a desorption medium circulation and VOCs closed-loop treatment system, which reduces operating costs and environmental impact.

[0018] In this invention, the water collection component, together with the water tank and water pump, forms a water resource circulation system. The condensate generated in the evaporator is collected, stored, and then replenished to the evaporator, reducing water waste. At the same time, the water in the tank forms a water seal structure, which effectively prevents gas backflow and leakage, and improves the stability and sealing of the device operation.

[0019] In this invention, the gas collection chamber selectively separates carbon dioxide from the mixed gas using a PI membrane and collects it into a gas storage tank. This reduces direct carbon dioxide emissions and allows the collected carbon dioxide to be linked with the factory's fire suppression system for asphyxiation fire suppression, thus achieving the resource utilization of waste gas. Throughout the purification process, multiple components work together to achieve waste heat recovery, media circulation, and harmless treatment of pollutants, balancing environmental benefits with practical value. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a VOCs adsorption and purification device for the processing of traditional Chinese medicine proposed in this invention. Figure 2 This is a rear-view axonometric view of a VOCs adsorption and purification device for the processing of traditional Chinese medicine proposed in this invention. Figure 3 for Figure 2 A magnified view of a section at point X; Figure 4 This is a half-section axonometric view of a VOCs adsorption and purification device for traditional Chinese medicine processing proposed in this invention. Figure 5 This is a half-sectional axonometric view of the heating mechanism of a VOCs adsorption and purification device in the processing of traditional Chinese medicine proposed in this invention. Figure 6 This is a vertical sectional view of the adsorption mechanism of a VOCs adsorption and purification device for the processing of traditional Chinese medicine proposed in this invention. Figure 7 for Figure 6 A magnified view of a portion of point Y in the middle; Figure 8 This is a half-sectional axonometric view of the buffer tank of a VOCs adsorption and purification device in the traditional Chinese medicine processing process proposed in this invention. Figure 9 Vertical cross-section of the evaporator of a VOCs adsorption and purification device for traditional Chinese medicine processing proposed in this invention. Figure 1; Figure 10 Vertical cross-section of the evaporator of a VOCs adsorption and purification device for traditional Chinese medicine processing proposed in this invention. Figure 2 ; Figure 11 for Figure 10 A magnified view of the area at point Z in the middle.

[0021] In the diagram: 1. Burner; 2. Evaporator; 3. Laval tube; 4. Buffer tank; 5. Adsorption mechanism; 6. Nitrogen tank; 7. Gas storage tank; 8. Water collection box; 9. Heating mechanism; 10. Water tank; 21. Gas pipe one; 22. Gas pipe two; 23. Gas pipe three; 24. Gas pipe four; 31. High-pressure side; 32. Evaporation side; 33. Low-pressure side; 41. Gas pipe five; 42. Zeolite membrane; 43. Gas pipe six; 51. Gas outlet pipe; 52. Motor; 53. Adsorption tank; 54. Inspection door; 55. Gas filling sealing ring; 71. Gas collection chamber; 72. Exhaust pipe; 73. PI membrane; 81. Water tank; 91. Electric cylinder; 92. Piston; 93. Temperature sensor; 94. Gas pipe seven. Detailed Implementation

[0022] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] Reference Figure 1 , Figure 2 and Figure 6 A VOCs adsorption and purification device for the processing of traditional Chinese medicine includes an adsorption mechanism 5. The adsorption mechanism 5 includes an adsorption box. Multiple adsorption tanks 53 are rotatably connected inside the adsorption box. Both ends of the adsorption tanks 53 are provided with communication ports. A first interface group is provided on the adsorption box. When the adsorption tanks 53 rotate to the adsorption station, the communication ports at both ends are respectively sealed and connected to the first interface group.

[0024] The adsorption box adopts a sealed box structure. Its inner wall is equipped with a sealing end face that matches the first interface group, corresponding to the rotation trajectory of the adsorption tank 53. This ensures that there is no airflow leakage when the adsorption tank 53 is in the adsorption position. Multiple adsorption tanks 53 are evenly distributed along the circumference of the mounting frame. By rotating and switching positions, adsorption, desorption, and maintenance can be carried out alternately to ensure continuous operation of the device.

[0025] A motor 52 is installed on one side of the adsorption box. The output end of the motor 52 is sealed through the wall of the adsorption box and is fixedly connected to a mounting frame. The mounting frame is rotatably connected inside the adsorption box. Multiple adsorption tanks 53 can be detachably installed on the mounting frame. An inspection door 54 is installed at the bottom of the adsorption box for the adsorption tanks 53 to enter and exit the adsorption box. The adsorption tanks 53 are filled with activated carbon for adsorbing VOCs.

[0026] The mounting frame adopts a frame structure, with its two ends supported by bearings rotating against the inner wall of the adsorption box. The motor 52 is connected to the mounting frame through a reduction mechanism to ensure that the adsorption tank 53 rotates smoothly and the station switching is precise. The adsorption tank 53 is detachably connected to the mounting frame by snap-fit ​​or bolt fixing, which is convenient for quick replacement. The inspection door 54 is equipped with a sealing lock, which forms a seal with the adsorption box when closed to prevent gas leakage.

[0027] The air inlet of the first interface group is connected to the second air pipe 22, and its outlet is connected to the outlet pipe 51. The air inlet of the second air pipe 22 is connected to the first air pipe 21, and the air inlet of the first air pipe 21 is connected to the air containing VOCs in the traditional Chinese medicine processing plant.

[0028] The first interface group includes an air inlet and an air outlet, which correspond one-to-one with the second air pipe 22 and the air outlet pipe 51, respectively. The interface is provided with a sealing groove that is compatible with the inflation sealing ring 55. The end face is sealed by the expansion of the inflation sealing ring 55. Both the first air pipe 21 and the second air pipe 22 are made of corrosion-resistant sealing pipes. Their connection parts are fixed by flanges or compression fittings to ensure that there is no leakage during the airflow transportation process.

[0029] Reference Figure 7 An inflation sealing ring 55 is fixedly connected to the connecting port of the adsorption tank 53. The inflation sealing ring 55 is connected to an external inflation and deflation device to control the expansion and contraction of the inflation sealing ring 55. When the adsorption tank 53 rotates to the adsorption station, the inflation sealing rings 55 at both ends of it are inflated and expanded, so that the two connecting ports are respectively sealed and connected to the first interface group. An air valve is installed on the first interface group to control the flow of air.

[0030] The inflatable sealing ring 55 is made of heat-resistant and corrosion-resistant elastic material. It has an internal inflation chamber and expands and contracts by adjusting the air pressure of the external inflation and deflation device. When the adsorption tank 53 rotates to switch positions, the inflatable sealing ring 55 first deflates and contracts to avoid friction with the inner wall of the adsorption tank during rotation. After it reaches the correct position, it inflates again to achieve a seal, which ensures both sealing effect and rotational flexibility. The air valve is an electromagnetic control valve that is linked with the controller to ensure that the airflow is switched on and off synchronously when switching positions.

[0031] Reference Figure 1 and Figure 2 It also includes a Laval tube 3, the inlet end of which is connected to a burner 1, the throat end of which is connected to an evaporator 2, and the outlet end of which is connected to a gas pipe 23. When the burner 1 is working, its outlet end is supplied with a high-temperature and high-pressure gas flow to the inlet end of the Laval tube 3.

[0032] Burner 1 adopts a gas combustion structure, which achieves complete combustion by adjusting the mixing ratio of oxygen and gas, and the resulting high-temperature and high-pressure gas flow provides a power source for Laval tube 3.

[0033] Reference Figure 4 The inlet end of the Laval pipe 3 is the high-pressure side 31, the throat end is the evaporation side 32, and the outlet end is the low-pressure side 33. The high-pressure side 31 is connected to the outlet end of the burner 1, the evaporation side 32 is connected to the outlet end of the evaporator 2, and the low-pressure side 33 is connected to the inlet end of the gas pipe 23.

[0034] The high-pressure side 31, evaporation side 32, and low-pressure side 33 of the Laval tube 3 adopt an integrated molding structure. The diameter of the evaporation side 32 is smaller than that of the high-pressure side 31 and the low-pressure side 33, which accelerates the airflow at the throat to form a negative pressure, providing power for the evaporation process of the evaporator 2.

[0035] Evaporator 2 is a sealed cavity structure containing water. Evaporation side 32 is connected to the cavity of evaporator 2. The negative pressure at the throat of Laval tube 3 drives the medium to evaporate rapidly, forming a low-temperature environment.

[0036] Both the first air pipe 21 and the third air pipe 23 are fixedly connected to the pipe sections inside the evaporator 2. The fins are evenly distributed along the circumference of the pipe section to increase the heat exchange area with the low temperature environment and achieve efficient heat exchange between the airflow to be purified and the waste heat airflow.

[0037] A VOCs concentration monitor is installed inside the outlet pipe 51 to send a feedback signal when the VOCs concentration exceeds the set value. The motor 52, the first air valve, the air filling and venting device and the VOCs concentration monitor are all electrically connected to a controller. The controller is electrically connected to an alarm. The controller receives the feedback signal from the VOCs concentration monitor and controls the working status of each actuator.

[0038] The VOCs concentration monitor adopts an online detection structure. Its detection probe extends into the airflow channel of the outlet pipe 51 to collect gas concentration data in real time and transmit it to the controller. The controller adopts a programmable logic control unit with a preset VOCs concentration threshold. When the detected value exceeds the standard, the alarm is immediately triggered to issue a warning. At the same time, the control valve closes the airflow channel of the current adsorption tank 53, the gas sealing ring 55 releases gas, and the motor 52 drives the mounting frame to rotate, switching the standby adsorption tank 53 to the adsorption station, realizing the station switching without stopping the machine.

[0039] Reference Figure 9 and Figure 10 The middle parts of air pipe 21 and air pipe 23 are sealed through the cavity of evaporator 2, and their condensate outlets are connected to water collection components.

[0040] The condensate outlet is located at the lowest point of the gas pipe section inside the evaporator 2, which facilitates the collection and discharge of condensate. It is connected to the water tank 81 of the water collection assembly through a pipeline to achieve directional collection of condensate.

[0041] The water collection assembly includes a water collection box 8, with a water tank 81 fixedly connected to the top of the water collection box 8 for collecting condensate. The water tank 81 is filled with water, and the condensate outlets of the first air pipe 21 and the third air pipe 23 both extend into the water inside the water tank 81. The top of the water tank 81 is connected to the inside of the water collection box 8.

[0042] The water tank 81 adopts an open structure, and the water inside forms a water seal. The condensate outlets of the air pipe 1 21 and air pipe 3 23 extend underwater to prevent the gas in the water collection box 8 from flowing back through the drain pipe. The volume of the water tank 81 is adapted to the amount of condensate produced. An overflow port is provided on its top edge. When the condensate exceeds the set water level, it flows into the lower part of the water collection box 8 through the overflow port to ensure that the water tank 81 always maintains a stable water seal height.

[0043] A water pump is installed on the water collection box 8. The water pump's suction end is sealed and extends into the bottom of the water collection box 8. Its outlet end is connected to the water tank 10. A water level gauge is installed inside the water collection box 8. A water pump is installed on the evaporator 2. The water pump's suction end is connected to the bottom of the water tank 10. Its outlet end is connected to the inside of the evaporator 2. A water level gauge is installed inside the evaporator 2. Water pump 1, water level gauge 1, water pump 2, and water level gauge 2 are all electrically connected to the controller. The controller receives signals from each water level gauge and controls the working status of each water pump.

[0044] Both water level gauge 1 and water level gauge 2 adopt a liquid level sensing structure to monitor the medium water level in the water collection box 8 and the evaporator 2 in real time, respectively. When the water level in the water collection box 8 reaches the set height, the controller starts water pump 1 to transport water to the water tank 10 for storage. When the water level in the evaporator 2 is lower than the set value, the controller starts water pump 2 to draw water from the water tank 10 to replenish it, forming a medium recycling system, which saves resources and ensures the stable operation of the evaporator 2.

[0045] Reference Figures 1-3 and Figure 6 The adsorption box is provided with a second interface group. When the adsorption tank 53 rotates to the desorption station, the connecting ports at both ends of the adsorption tank 53 are sealed and connected to the second interface group. The inlet end of the second interface group is connected to the gas pipe 7 94, and the outlet end is connected to the nitrogen treatment component. The outlet end of the nitrogen treatment component is connected to the gas pipe 5 41. The outlet end of the gas pipe 5 41 is connected to the inlet end of the burner 1. The inlet end of the gas pipe 7 94 is connected to the heating mechanism 9. The outlet end of the gas pipe 3 23 is connected to multiple branch pipes. The multiple branch pipes are sealed and pass through the heating mechanism 9. Heat is conducted through the pipe wall to heat the inside of the heating mechanism 9. The second interface group is equipped with a gas valve 2, which is electrically connected to the controller.

[0046] The second interface group has the same structure as the first interface group and is symmetrically arranged on the other side of the adsorption box. Its air inlet is connected to the gas pipe 7 94 and its air outlet is connected to the nitrogen treatment component. The air is sealed and connected by the gas sealing ring 55. The multiple branches of the gas pipe 3 23 adopt an equal diameter branch structure and are evenly distributed inside the heating mechanism 9. The waste heat is transferred to the nitrogen in the heating mechanism 9 through heat conduction through the pipe wall to realize the recovery and utilization of waste heat. The gas pipe 5 41 transports the VOCs separated by the nitrogen treatment component to the burner 1, and achieves non-toxic treatment through high-temperature combustion, forming a closed-loop treatment of VOCs.

[0047] Reference Figure 8 The nitrogen treatment assembly includes a buffer tank 4, the inlet of which is connected to the outlet of the second interface group, and the outlet of which is connected to the inlet of the fifth gas pipe 41. The top of the buffer tank 4 is connected to the sixth gas pipe 43. A zeolite membrane 42 is installed at the connection port between the sixth gas pipe 43 and the buffer tank 4 for selectively permeating nitrogen and blocking VOCs. The outlet of the sixth gas pipe 43 is connected in sequence to a nitrogen pump and a nitrogen tank 6. The nitrogen pump is used to pressurize the nitrogen introduced through the sixth gas pipe 43 into the interior of the nitrogen tank 6.

[0048] The buffer tank 4 adopts a pressure-bearing tank structure to temporarily store the VOCs mixture carried by nitrogen, and uses the density difference between nitrogen and VOCs to achieve preliminary stratification.

[0049] The zeolite membrane 42 adopts a nitrogen selective permeation membrane structure. Its pore size is matched with the size of nitrogen molecules, which allows nitrogen to pass through preferentially while blocking VOCs molecules, thus achieving efficient separation of nitrogen and VOCs. The nitrogen pump is a pressurized delivery structure that pressurizes the separated nitrogen and injects it into the nitrogen tank 6 for storage, providing a circulating medium for the desorption process and reducing operating costs.

[0050] Reference Figure 5 and Figure 6 The heating mechanism 9 includes a heating tube, multiple branch pipes that are sealed through the heating tube, a piston 92 that is slidably connected inside the heating tube, an electric cylinder 91 that is installed on the heating tube, the output end of the electric cylinder 91 that is sealed through the wall of the heating tube and fixedly connected to the piston 92, a through hole that is adapted to the branch pipe that passes through the through hole and slides with the piston 92, the outer side of the piston 92 that is spaced apart from the inner wall of the heating tube, a nitrogen tank 6 that is connected to one end of the heating tube near the gas pipe 23, and a gas pipe 94 that is connected to the other end of the heating tube, a temperature sensor 93 that is installed on the gas pipe 94, and both the temperature sensor 93 and the electric cylinder 91 that are electrically connected to the controller, the controller receiving the signal from the temperature sensor 93 and controlling the working state of the electric cylinder 91.

[0051] The heating tube is an insulated tubular structure. Its inner wall, together with the branch pipe and piston 92, forms a nitrogen heating channel. The piston 92 is driven by the electric cylinder 91 to move axially along the heating tube, changing the flow path length of nitrogen in the heating channel, thereby adjusting the heating time and temperature. The temperature sensor 93 detects the temperature of the nitrogen after heating in real time and feeds the data back to the controller. The controller adjusts the extension and retraction of the electric cylinder 91 to maintain the nitrogen temperature within the range suitable for desorption, ensuring stable desorption effect. The joint between the branch pipe, the heating tube, and the piston 92 adopts a sealed structure to prevent nitrogen leakage from affecting the heating efficiency.

[0052] Reference Figure 10 and Figure 11 The outlet of the third trachea 23 is connected to the fourth trachea 24, and the outlet of the fourth trachea 24 is connected to a carbon dioxide gas treatment component. The carbon dioxide gas treatment component includes a gas collection chamber 71, the inlet of the gas collection chamber 71 is connected to the outlet of the fourth trachea 24, the bottom of the chamber is connected to a gas storage tank 7, and the top of the chamber is connected to an exhaust pipe 72. A PI membrane (polyimide) is installed at the connection port between the gas collection chamber 71 and the gas storage tank 7 for selectively permeating carbon dioxide gas. A pressure relief valve is installed inside the exhaust pipe 72 for venting exhaust after the pressure inside the gas collection chamber 71 reaches a set value.

[0053] The fourth gas pipe 24 is used to transport the mixed gas after heat exchange by the heating mechanism 9. Its pipeline structure is consistent with that of the first gas pipe 21 and the third gas pipe 23 to ensure stable gas delivery. The gas collection chamber 71 is a sealed cavity. The PI membrane 73 is horizontally installed at the connection port between the gas collection chamber 71 and the gas storage tank 7. The selective permeation characteristics of the PI membrane 73 for carbon dioxide are used to separate and collect carbon dioxide in the mixed gas.

[0054] Gas storage tank 7 is a pressurized gas storage structure used to store separated carbon dioxide, and can be linked with the factory fire extinguishing system to achieve asphyxiation fire extinguishing.

[0055] The pressure relief valve adopts a pressure sensing structure. When the pressure in the gas collecting chamber 71 exceeds the set value, it will automatically open to release gas, so as to avoid excessive pressure affecting the safety of the equipment. During the venting process, the gas that is not separated is discharged through the exhaust pipe 72 to ensure that the pressure in the gas collecting chamber 71 is stable.

[0056] Electromagnetic control valves can be installed at the inlet and outlet ends of key pipelines such as trachea 1 (21), trachea 2 (22), trachea 3 (23), trachea 5 (41), and trachea 7 (94) as needed. All electromagnetic control valves are electrically connected to the controller. The controller can control the opening and closing status of each electromagnetic control valve in real time according to the preset program or the signal feedback from the sensor, thereby realizing the orderly switching and linkage of processes such as adsorption, desorption, waste heat recovery, and nitrogen circulation.

[0057] When the present invention is used, the burner 1 fully combusts by adjusting the mixing ratio of oxygen and fuel gas, and keeps the temperature inside the furnace of the burner 1 not lower than 800°C. The high-temperature and high-pressure gas flow enters the high-pressure side 31 of the Laval pipe 3. The gas flow is accelerated through the evaporation side 32 to form a strong negative pressure, which provides power for the evaporation process of the evaporator 2. The subsequent gas flow enters the gas pipe 3 23 from the low-pressure side 33.

[0058] In the traditional Chinese medicine processing plant, air containing VOCs enters through air pipe 21. Air pipe 21 passes through the interior of evaporator 2 in a sealed manner and cooperates with the fins. In the low-temperature environment of evaporator 2, heat exchange occurs rapidly, and water vapor in the gas condenses into liquid water. The condensate is discharged into the water tank 81 of the water collection component through the condensate outlet, thus achieving gas drying pretreatment and avoiding water vapor affecting the adsorption effect of activated carbon.

[0059] After drying, the gas to be purified is introduced into the first interface group of the adsorption mechanism 5 through the second gas pipe 22. At this time, the adsorption tank 53 has been rotated to the adsorption station. The gas-filled sealing rings 55 at both ends of the tank are inflated and sealed to the first interface group. The gas flows through the activated carbon in the adsorption tank 53, and VOCs are efficiently adsorbed. The purified gas is discharged through the outlet pipe 51. The VOCs concentration monitor in the outlet pipe 51 detects the concentration in real time. If the concentration exceeds the standard, the alarm is triggered. The controller synchronously controls the gas-filled sealing rings 55 of the current adsorption tank 53 to release gas and the first gas valve to close. The motor 52 drives the mounting frame to rotate, switching the standby adsorption tank 53 to the adsorption station to achieve continuous adsorption without stopping the machine.

[0060] The saturated adsorption tank 53 rotates with the mounting frame to the desorption station. Its two ends are connected to the second interface group by an air-filled sealing ring 55. Nitrogen gas in the nitrogen tank 6 is introduced into the heating mechanism 9. Multiple branch pipes branching off from the gas pipe 23 provide heat to the heating mechanism 9 through the pipe wall. The controller adjusts the position of the piston 92 through the electric cylinder 91 according to the feedback of the temperature sensor 93, changing the length of the nitrogen heating path, so that the nitrogen temperature is maintained at 100 to 120°C to ensure stable desorption. The heated nitrogen gas is introduced into the adsorption tank 53 in the desorption station through the gas pipe 94. Through the principle of thermal shock and pressure displacement, the adsorbed VOCs are desorbed, and the nitrogen gas carries the VOCs into the nitrogen treatment component.

[0061] The mixed gas is temporarily stored inside the buffer tank 4. It is initially separated into layers by the density difference between nitrogen and VOCs. The zeolite membrane 42 selectively allows nitrogen to pass through. After being pressurized by the gas pipe 43 and the nitrogen pump, it is returned to the nitrogen tank 6 for recycling. The VOCs in the buffer tank 4 are introduced into the burner 1 through the gas pipe 41, where they are decomposed into non-toxic carbon dioxide and water at high temperature, thus achieving closed-loop harmless treatment of VOCs.

[0062] The high-temperature airflow in the third air duct 23 exchanges heat with the heating mechanism 9 and then continues to exchange heat with the water in the evaporator 2. The liquid water generated by its own condensation and the condensate in the first air duct 21 flow together into the water collection box 8. When the water level gauge 1 in the water collection box 8 detects that the water level is up to standard, the water pump 1 delivers the water to the water tank 10 for storage. When the water level gauge 2 in the evaporator 2 detects that the water level is insufficient, the water pump 2 draws water from the water tank 10 to replenish it, thus forming a water resource recycling system.

[0063] After heat exchange in evaporator 2, the mixed gas (mainly containing carbon dioxide and a small amount of unseparated gas) is introduced into gas collection chamber 71 through gas pipe 24. PI membrane 73 selectively allows carbon dioxide to pass through and is collected in gas storage tank 7, which can be linked to the factory fire extinguishing system for asphyxiation extinguishing. When the pressure in gas collection chamber 71 reaches the set value, the pressure relief valve automatically opens, and the unseparated gas is safely discharged through exhaust pipe 72, completing the entire VOCs adsorption and purification process.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A VOCs adsorption and purification device for the processing of traditional Chinese medicine, characterized in that, The device includes an adsorption mechanism (5), which includes an adsorption box. Multiple adsorption tanks (53) are rotatably connected inside the adsorption box. Both ends of the adsorption tanks (53) are provided with communication ports. A first interface group is provided on the adsorption box. When the adsorption tanks (53) rotate to the adsorption station, the communication ports at both ends are respectively sealed and connected to the first interface group. The first interface group has an air inlet end connected to an air pipe two (22) and an air outlet end connected to an air outlet pipe (51). The air inlet end of the air pipe two (22) is connected to an air pipe one (21). The air inlet end of the air pipe one (21) is connected to the air containing VOCs in the Chinese medicine processing plant. It also includes a Laval tube (3), the inlet end of which is connected to a burner (1), the throat end of which is connected to an evaporator (2), and the outlet end of which is connected to a gas pipe (23). When the burner (1) is working, its outlet end is fed into the inlet end of the Laval tube (3) with a high temperature and high pressure airflow. The middle parts of the first (21) and the third (23) of the gas pipe are sealed through the cavity of the evaporator (2), and their condensate outlets are connected to a water collection assembly.

2. The VOCs adsorption and purification device for the processing of traditional Chinese medicine according to claim 1, characterized in that, A motor (52) is installed on one side of the adsorption box. The output end of the motor (52) is sealed through the wall of the adsorption box and is fixedly connected to a mounting frame. The mounting frame is rotatably connected to the inside of the adsorption box. Multiple adsorption tanks (53) can be detachably installed on the mounting frame. An inspection door (54) is installed at the bottom of the adsorption box for the adsorption tanks (53) to enter and exit the adsorption box. The inside of the adsorption tanks (53) is filled with activated carbon for adsorbing VOCs.

3. The VOCs adsorption and purification device for the processing of traditional Chinese medicine according to claim 2, characterized in that, An inflation sealing ring (55) is fixedly connected to the communication port of the adsorption tank (53). The inflation sealing ring (55) is connected to an external inflation and deflation device and is used to control the expansion and contraction state of the inflation sealing ring (55). When the adsorption tank (53) rotates to the adsorption station, the inflation sealing rings (55) at both ends of it are inflated and expanded, so that the two communication ports are respectively sealed and connected to the first interface group. An air valve is installed on the first interface group to control the flow of air.

4. The VOCs adsorption and purification device for the processing of traditional Chinese medicine according to claim 1, characterized in that, The inlet end of the Laval tube (3) is the high-pressure side (31), the throat end is the evaporation side (32), and the outlet end is the low-pressure side (33). The high-pressure side (31) is connected to the outlet end of the burner (1), the evaporation side (32) is connected to the outlet end of the evaporator (2), and the low-pressure side (33) is connected to the inlet end of the gas pipe three (23). The gas pipe one (21) and the gas pipe three (23) are both fixedly connected to the pipe sections inside the evaporator (2).

5. The VOCs adsorption and purification device for the processing of traditional Chinese medicine according to claim 3, characterized in that, The outlet pipe (51) is equipped with a VOCs concentration monitor, which is used to send a feedback signal when the VOCs concentration exceeds the set value. The motor (52), the first air valve, the air filling and releasing device and the VOCs concentration monitor are all electrically connected to a controller. The controller is electrically connected to an alarm. The controller receives the feedback signal from the VOCs concentration monitor and controls the working status of each actuator.

6. The VOCs adsorption and purification device for the processing of traditional Chinese medicine according to claim 5, characterized in that, The water collection assembly includes a water collection box (8), and a water tank (81) is fixedly connected to the top of the water collection box (8) for collecting condensate. The water tank (81) is filled with water. The condensate outlets of the first air pipe (21) and the third air pipe (23) extend into the water inside the water tank (81). The top of the water tank (81) is connected to the inside of the water collection box (8). A water pump is installed on the water collection box (8). The pump's suction end is sealed and extends into the bottom of the water collection box (8). Its outlet end is connected to a water tank (10). A water level gauge is installed inside the water collection box (8). A water pump is installed on the evaporator (2). The pump's suction end is connected to the bottom of the water tank (10). Its outlet end is connected to the inside of the evaporator (2). A water level gauge is installed inside the evaporator (2). The water pump, water level gauge, water pump, and water level gauge are all electrically connected to a controller. The controller receives signals from each water level gauge and controls the working status of each water pump.

7. The VOCs adsorption and purification device for the processing of traditional Chinese medicine according to claim 5, characterized in that, The adsorption box is provided with a second interface group. When the adsorption tank (53) rotates to the desorption station, the two ends of the adsorption tank are respectively sealed and connected to the second interface group. The inlet end of the second interface group is connected to the gas pipe seven (94), and the outlet end is connected to the nitrogen treatment component. The outlet end of the nitrogen treatment component is connected to the gas pipe five (41). The outlet end of the gas pipe five (41) is connected to the inlet end of the burner (1). The inlet end of the gas pipe seven (94) is connected to the heating mechanism (9). The outlet end of the gas pipe three (23) is connected to multiple branch pipes. The multiple branch pipes are sealed and pass through the heating mechanism (9). Heat is conducted through the pipe wall to heat the inside of the heating mechanism (9). The second interface group is equipped with a gas valve two. The gas valve two is electrically connected to the controller.

8. The VOCs adsorption and purification device for the processing of traditional Chinese medicine according to claim 7, characterized in that, The nitrogen treatment assembly includes a buffer tank (4), the inlet of which is connected to the outlet of the second interface group, and the outlet of which is connected to the inlet of the fifth duct (41). The top of the buffer tank (4) is connected to the sixth duct (43). A zeolite membrane (42) is installed at the connection port between the sixth duct (43) and the buffer tank (4) for selectively permeating nitrogen and blocking VOCs. The outlet of the sixth duct (43) is connected to a nitrogen pump and a nitrogen tank (6) in sequence. The nitrogen pump is used to pressurize the nitrogen introduced through the sixth duct (43) into the interior of the nitrogen tank (6).

9. The VOCs adsorption and purification device for the processing of traditional Chinese medicine according to claim 8, characterized in that, The heating mechanism (9) includes a heating tube, and multiple branch pipes are sealed through the heating tube. A piston (92) is slidably connected inside the heating tube. An electric cylinder (91) is installed on the heating tube. The output end of the electric cylinder (91) is sealed through the wall of the heating tube and is fixedly connected to the piston (92). A through hole adapted to the branch pipe is opened on the piston (92). The branch pipe passes through the through hole and slides with the piston (92). The outer side of the piston (92) is spaced apart from the inner wall of the heating tube. One end of the heating tube near the third gas pipe (23) is connected to a nitrogen tank (6), and the other end is connected to the seventh gas pipe (94). A temperature sensor (93) is installed on the seventh gas pipe (94). The temperature sensor (93) and the electric cylinder (91) are both electrically connected to the controller. The controller receives the signal from the temperature sensor (93) and controls the working state of the electric cylinder (91).

10. The VOCs adsorption and purification device for the processing of traditional Chinese medicine according to claim 1, characterized in that, The outlet of the third duct (23) is connected to the fourth duct (24), and the outlet of the fourth duct (24) is connected to a carbon dioxide gas treatment component. The carbon dioxide gas treatment component includes a gas collection chamber (71). The inlet of the gas collection chamber (71) is connected to the outlet of the fourth duct (24). The bottom of the chamber is connected to a gas storage tank (7), and the top of the chamber is connected to an exhaust pipe (72). A PI membrane is installed at the connection port between the gas collection chamber (71) and the gas storage tank (7) for selectively permeating carbon dioxide gas. A pressure relief valve is installed inside the exhaust pipe (72) for venting exhaust after the pressure inside the gas collection chamber (71) reaches a set value.

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