A soybean oil leach tail gas absorption and resolution system

Abstract

This application discloses a novel tail gas absorption and desorption system for soybean oil extraction, comprising: an identification module, an absorption module, a magnetic field module, and a feeding module. The identification module is used to identify hazardous substances, and the specific identification steps are as follows: real-time acquisition of risk data, calculation of migration risk index based on risk data, and adjustment of absorption parameters according to migration risk index; acquisition of pressure data and valve status data of the absorption tower in the absorption module, calculation of escape risk index, and classification of escape risk level according to escape index; monitoring of residual solvent concentration in tail gas, adjustment of spray volume and centrifuge status according to residual solvent concentration, and automatic switching of treatment scheme according to the magnitude of migration risk index through a graded treatment mechanism, thereby achieving effective control and removal of hazardous substances in degummed oil, reducing hazardous substance residue, and improving the quality and safety of degummed oil.

Description

Technical Field

[0001] This invention relates to the field of absorption technology for leaching tail gas, and more particularly to a system for absorbing and desorbing soybean oil leaching tail gas. Background Technology

[0002] Soybean oil extraction is a core technology in the modern oilseed industry, achieving efficient oil extraction through the use of organic solvents (such as n-hexane). The process encompasses three main stages: raw material pretreatment, oil extraction, and solvent recovery. The pretreatment stage improves raw material permeability through cleaning, crushing, and rolling. The extraction stage thoroughly mixes the raw material with the solvent, dissolving the oil to form a mixed oil. The solvent recovery stage separates the solvent from the oil through evaporation and distillation, ultimately yielding crude soybean oil. Extraction offers high oil yields (residual oil content in soybean meal is less than 1%), and the solvent can be recycled, significantly reducing production costs. However, refining is required to remove solvent residues to meet national standards (≤10 mg / kg). Tail gas treatment is a key challenge in the extraction process. Tail gas mainly originates from non-condensable gases carried by the raw material during extraction and from solvent evaporation, containing solvent vapors and small amounts of VOCs. Solvents are highly volatile and toxic; direct emissions not only pollute the environment but also result in approximately one-third solvent loss, increasing production costs.

[0003] Traditional exhaust gas absorption and desorption systems typically utilize mineral oil for self-circulation. During this process, a certain amount of mineral oil will enter the leaching system through evaporation or entrainment. This portion of mineral oil will enter the solvent and participate in leaching, making it impossible to remove through normal processing methods. This results in the detection of mineral oil components in edible oils. Furthermore, long-term high-temperature self-circulation causes impurities and deterioration in the mineral oil, requiring regular replenishment and replacement, leading to high operating costs. These issues have always been a challenge and pain point for the industry. Summary of the Invention

[0004] This application provides a soybean oil leaching tail gas absorption and desorption system, which automatically switches the treatment scheme according to the migration risk index through a graded treatment mechanism to effectively control and remove risk substances in degummed oil, reduce risk substance residues, and improve the quality and safety of degummed oil.

[0005] This application provides a soybean oil extraction tail gas absorption and desorption system, including: an identification module, an absorption module, a magnetic field module, and a feeding module. The identification module is used to identify hazardous substances, and the specific identification steps are as follows:

[0006] S101: Collects risk data in real time, calculates the migration risk index based on the risk data, and adjusts the absorption parameters according to the migration risk index;

[0007] S102, collect pressure data and valve status data of the absorption tower in the absorption module, calculate the escape risk index, and classify the escape risk level according to the escape index;

[0008] S103 monitors the concentration of residual solvent in the exhaust gas and adjusts the spray volume and centrifuge status according to the concentration of residual solvent.

[0009] Preferably, the formula for calculating the migration risk index is: ,in, Indicates the migration risk index. Indicates the concentration of chlorpyrifos. This indicates a deviation in acid value. This indicates the concentration of chlorpyrifos in the exhaust gas. This represents an adjustment constant for chlorpyrifos concentration, preventing calculation failure when C=0. A reference constant representing the concentration of chlorpyrifos in exhaust fumes, used to correct for exhaust gas detection limits. , and These represent the weights of chlorpyrifos concentration, acid value deviation, and exhaust gas chlorpyrifos concentration, respectively. + + =1.

[0010] Preferably, the risk is classified according to the calculated migration risk index, and a threshold range is set. The threshold range includes a minimum threshold and a maximum threshold. When the migration risk index is less than the minimum threshold, it is a low-risk level; when the migration risk index is greater than or equal to the minimum threshold and less than the maximum threshold, it is a medium-risk level; and when the migration risk index is greater than or equal to the maximum threshold, it is a high-risk level.

[0011] Preferably, the graded treatment includes a two-layer treatment strategy: the first layer is adsorption treatment, and the second layer is adsorption and photocatalytic treatment.

[0012] Preferably, the formula for calculating the escape risk index is: ,in, Indicates the escape risk index. Indicates the inlet pressure of the absorption tower. This represents the basic risk multiplication factor. This represents the pressure normalization coefficient. Indicates real-time phospholipid content. This represents the normalization coefficient for phospholipid content.

[0013] Preferably, the replenishment module is used to replenish the solvent, and the specific replenishment method is as follows:

[0014] S201, Use detection equipment to detect the concentration of each solvent in the mixed solvent and calculate the proportion of solvent in the recovery solvent tank;

[0015] S202, calculate the proportion deviation based on the concentration of the mixed solution, and adjust the system parameters based on the proportion deviation;

[0016] S203, adjust the feeding module based on the ratio deviation and the concentration of ethyl acetate in the recovery solvent tank.

[0017] Preferably, the mixed solvent includes a nonpolar solvent and a polar solvent. The nonpolar solvent has a symmetrical molecular structure with the centers of positive and negative charges coinciding and a dipole moment of zero. The polar solvent has an asymmetrical molecular structure with the centers of positive and negative charges not coinciding and a dipole moment present.

[0018] Preferably, the formula for calculating the solvent ratio in the solvent recovery tank is: ,in, This indicates the concentration ratio of n-hexane to ethyl acetate in the solvent recovery tank, reflecting the relative content of polar and non-polar solvents in the mixed solvent. This indicates the concentration of n-hexane in the exhaust gas. This indicates the concentration of ethyl acetate in the exhaust gas.

[0019] Preferably, the magnetic field module is used to identify metal micelles in the oil film, and the steps for identifying metal micelles are as follows:

[0020] S301 collects electrostatic voltage and metal concentration in real time, and performs dielectric regulation based on the collected data;

[0021] S302, based on the obtained metal concentration, identify metal micelles in the oil film and separate them from the medium;

[0022] S303 processes the separated metal colloids.

[0023] Preferably, the dielectric regulation includes eliminating static electricity and neutralizing charge. Eliminating static electricity involves applying a direct current to the coating to reduce the surface resistance of the coating and achieve the conduction of static electricity. Neutralizing charge involves activating a pulsed electron beam emitting device to emit a reverse electron flow to neutralize the positive charge in the oil film.

[0024] One or more technical solutions provided in this application have at least the following technical effects or advantages: the graded treatment mechanism automatically switches the treatment scheme according to the size of the migration risk index, realizes effective control and removal of risky substances (such as pesticide residues) in degumming oil, reduces risky substance residues, improves the quality and safety of degumming oil, monitors key quality parameters of degumming oil in real time, ensures that phospholipid content and acid value are within a controllable range, monitors and predicts solvent escape risk in real time, takes emergency measures in a timely manner through the graded response mechanism to suppress solvent escape, realizes cross-system data linkage, optimizes solvent absorption effect, improves solvent recovery rate, and reduces production costs and environmental pollution;

[0025] To address the problem of selective imbalance in degumming oil absorption, maintain the balance of polar and non-polar solvent ratios in the mixed solvent, improve solvent recovery rate, reduce system energy consumption, and ensure the safety and stability of the production process, the dynamic feeding algorithm and real-time monitoring system shorten system response delay, enabling timely response to solvent ratio imbalances and reducing secondary risks. By optimizing the dual-tower absorption and feeding modules, system energy consumption is reduced, energy utilization efficiency is improved, and production costs are lowered.

[0026] By breaking down the three-stage contamination chain from dielectric regulation to micelle formation to final disposal, more comprehensive contamination control is achieved, avoiding solvent-metal micelle contamination caused by high-speed collisions of solvent molecules. Through cross-system synergy and linkage with the solvent ratio control system, the risks of electrostatic and heavy metal contamination can be addressed in a timely manner, improving the safety of the production process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the process for the absorption and desorption of soybean oil extraction tail gas according to the present invention.

[0028] Figure 2 This is a schematic flowchart of the feeding method of the present invention;

[0029] Figure 3 This is a schematic diagram of the process for identifying metal colloids according to the present invention. Detailed Implementation

[0030] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0031] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Example 1: Figure 1This is a schematic flowchart of a soybean oil extraction tail gas absorption and desorption system according to an embodiment of the present invention, including: an identification module, an absorption module, a magnetic field module, and a feeding module. The identification module is used to identify hazardous substances, and the specific identification steps are as follows:

[0034] S101: Collects risk data in real time, calculates the migration risk index based on the risk data, and adjusts the absorption parameters according to the migration risk index;

[0035] Specifically, risk data in the degumming oil is collected through sensors. This risk data includes chlorpyrifos concentration, acid value, chlorpyrifos concentration in exhaust gas, and phospholipid content. For acid value data, a standard acid value is set according to the production process and industry standards. The collected acid value data of the degumming oil is compared with the standard acid value to calculate the acid value deviation. A migration risk index is calculated based on the chlorpyrifos concentration, acid value deviation, and chlorpyrifos concentration in exhaust gas. This migration risk index is used to assess the level of risk data and its dynamic trend. A phospholipid threshold is set, and the phospholipid deviation is calculated based on the collected phospholipid content. When the phospholipid deviation is greater than zero, the bypass valve is opened, and the degumming oil is introduced into a centrifuge. The centrifuge is started, and the speed and time are adjusted. After centrifugation, the phospholipid content of the oil is remeasured. If the phospholipid content meets the standard, the degumming oil is returned to the main pipeline for continued production. If it still exceeds the standard, the centrifugation process is repeated.

[0036] Risk is categorized based on the calculated migration risk index. Threshold ranges are set based on historical risk data, including a minimum and a maximum threshold. When the migration risk index is below the minimum threshold, it is considered a low-risk level, indicating that the migration risk of hazardous substances in the degumming oil is within an acceptable range. Therefore, the current system parameters are maintained, and the monitoring frequency is adjusted to once per hour, i.e., collecting data on chlorpyrifos concentration, tail gas chlorpyrifos concentration, and acid value deviation every hour, and updating the migration risk index. When the migration risk index is greater than or equal to the minimum threshold and less than the maximum threshold, it is considered a medium-risk level. System parameters are dynamically adjusted based on real-time monitoring data. For example, if an increase in chlorpyrifos concentration leads to an increase in the migration risk index, the adsorption effect is enhanced by recirculating a portion of the tail gas discharged from the top of the absorption tower back to the treatment system. The system further reduces the content of hazardous substances in the exhaust gas through reprocessing, thereby reducing the impact on the environment, increasing the monitoring frequency, and updating the migration risk index. When the migration risk index is greater than or equal to the highest threshold, it is considered a high-risk level, and the system is shut down for a comprehensive overhaul. The adsorption performance is checked, and the spray flow rate is adjusted through the spray valve to help improve the solvent absorption effect. The graded treatment includes a two-layer treatment strategy. The first layer is adsorption treatment, in which the voltage of the activated carbon felt is adjusted according to the set parameters to make the activated carbon felt reach the first-layer treatment adsorption intensity to adsorb hazardous substances in the degumming oil. The second layer is adsorption and photocatalytic treatment, in which the voltage of the activated carbon felt is adjusted to twice the voltage of the first-layer treatment to enhance the adsorption capacity of the activated carbon felt, and the power of the ultraviolet lamp is adjusted to further degrade pesticide residues in the degumming oil through photocatalysis.

[0037] The absorption module is used to absorb the concentration of residual solvent in the exhaust gas. An infrared spectrometer is used to detect the residual solvent concentration in the exhaust gas in real time. Solvent molecules produce characteristic absorption peaks under infrared light of a specific wavelength. By detecting the intensity and position of these absorption peaks, the infrared spectrometer accurately calculates the concentration of residual solvent in the exhaust gas. The real-time concentration value of residual solvent detected by the infrared spectrometer is transmitted to the control system. By comparing it with the preset acceptable concentration range, the current solvent absorption effect is evaluated. If the residual solvent concentration is within the acceptable range, it indicates that the solvent absorption effect is good and the production process is operating normally. If the residual solvent concentration exceeds the acceptable range, it indicates that the solvent absorption effect is poor, and the spray parameters of the absorption tower are adjusted to increase the spray volume. The spray volume of the absorption tower is automatically adjusted according to the residual solvent concentration. A mechanism is set to reset the baseline volume every 24 hours. Within a 24-hour period, the system dynamically adjusts the spray volume according to the real-time monitored residual solvent concentration to cope with various changes that may occur during the production process. At the end of the hourly cycle, the system automatically resets the spray volume to the initial baseline value and then restarts to adaptively adjust according to the changes in the concentration of residual solvent. The periodic reset mechanism ensures that the spray parameters are always in the optimal state, which can guarantee the solvent absorption effect and avoid unnecessary resource waste and production fluctuations. Increasing the spray volume can increase the contact area and contact time between the solvent and the exhaust gas, thereby enhancing the solvent's ability to absorb residual substances in the exhaust gas and effectively reducing the residual solvent concentration in the exhaust gas.

[0038] S102, collect pressure data and valve status data of the absorption tower, calculate the escape risk index, and classify the escape risk level according to the escape index;

[0039] The escape risk index is an indicator calculated based on pressure and mass fluctuations to quantify solvent escape risk. Solvent escape refers to the increase in instantaneous solvent escape caused by system pressure fluctuations during switching degumming oil supply or equipment start-up and shutdown, which can lead to transient contamination. Pressure sensors are used to measure the pressure data at the inlet of the absorption tower. Valve opening sensors are installed at the bypass valve and spray valve in step S101 to measure the opening data of the bypass valve and spray valve. Phospholipid content and acid value data are used as mass fluctuation parameters to obtain mass fluctuation parameters. The received pressure data, bypass valve opening data, spray valve opening data, and mass fluctuation parameters are cleaned to convert different data formats into a unified data format. The obtained data is stored in the InfluxDB time series database.

[0040] The identification step S101, which uses bypass valves and acid value deviation values ​​to determine whether risk management is underway, involves using bypass valves to regulate the flow distribution of media within the system. Under normal production conditions, bypass valves are closed, with an opening of zero. At this time, the media is primarily transported and processed according to a pre-set process. When the opening of the bypass valve is greater than zero, it indicates that media is being diverted to the bypass channel, altering the flow state and pressure distribution of the media within the system, thus affecting the stability of the entire system and product quality. Acid value deviation is an indicator of the free fatty acid content in substances such as oils and fats. It reflects the quality and stability of the product. During production, the acid value should be maintained within a relatively stable range. When the acid value deviation exceeds a threshold, it indicates a significant change in the product's acid value, possibly due to unstable raw material quality, improper control of reaction conditions, or other reasons. Significant fluctuations in acid value caused by this can affect product performance and lifespan, and also increase the risk of system malfunctions such as solvent escape. When either the bypass valve opening is greater than zero or the acid value fluctuation is greater than the threshold, it indicates that the system is handling the risk. In this case, the basic risk multiplication factor is set to 1.5. Increasing the value of the basic risk multiplication factor can increase the escape risk index accordingly, thereby issuing risk warnings earlier and reminding operators to take appropriate measures to reduce the risk. When the bypass valve opening is equal to zero and the acid value deviation is less than or equal to the threshold, it indicates that the system is in normal production and is not handling the risk. In this case, the basic risk multiplication factor is set to 1. Under normal production conditions, the system risk is relatively low, so there is no need to further amplify the escape risk index.

[0041] The escape risk index is calculated based on pressure data, the basic risk multiplication factor, and phospholipid content, using the following formula: ,in, This represents the escape risk index, used to quantify the degree of risk of solvent escape. The higher the value, the higher the escape risk. The pressure at the inlet of the absorber tower is measured in real time by pressure sensors in the operating condition sensing layer. This represents the base risk multiplication factor, determined based on valve condition and quality fluctuations, and is used to adjust the calculated risk index. This represents the pressure normalization coefficient, used to map the pressure P to a relatively reasonable numerical range. The specific value is determined based on actual process experience, historical data analysis, and expert evaluation. This indicates the real-time phospholipid content, which is one of the parameters for quality fluctuation. This represents the normalization coefficient for phospholipid content, used to convert phospholipid content into a relative value. The specific value can also be determined based on actual process experience, historical data analysis, and expert evaluation.

[0042] Escape risk levels are classified according to the escape risk index. When the calculated escape risk index R < 1.0, it is considered low risk. At this time, the system operation is relatively stable, and the possibility of solvent escape is small. By switching the ventilation system to a low-power operation mode to reduce energy consumption, and putting the zeolite rotor into standby mode (the zeolite rotor is an adsorption device), the rotation speed is adjusted to maintain basic operation to prevent equipment stagnation and reduce unnecessary energy consumption. When 1.0 ≤ R < 2.0, it is considered medium risk, indicating that the system has certain potential risks. It is necessary to closely monitor the system's operation status and take corresponding preventive and adjustment measures in a timely manner. This includes increasing the air volume of the ventilation system to enhance indoor air circulation and reduce the concentration of harmful gases, increasing the rotation speed of the zeolite rotor to enhance the adsorption capacity of harmful gases, ensuring that indoor air quality meets safety standards, and opening the activated carbon adsorption box bypass to allow some gases to undergo preliminary adsorption treatment by activated carbon to further reduce the content of harmful gases. When R ≥ 2.0... If the situation is deemed high-risk, indicating a high probability of system malfunction and solvent escape, immediate emergency measures are required to prevent an accident. The ventilation system should be set to maximum to ensure rapid air exchange and reduce peak concentrations of harmful gases. The rotation speed of the zeolite rotor should be further increased to fully absorb residual harmful gases and prevent their spread to the surrounding environment. The solvent recovery pump should be activated to transport residual solvent through pipelines to the solvent recovery tank. A condenser inside the recovery tank will condense the solvent vapor into liquid for subsequent processing or reuse. Simultaneously, the audible and visual alarm should be activated to alert on-site personnel to safety and to initiate emergency plans, such as evacuating personnel and shutting down relevant equipment.

[0043] S103, monitor the concentration of residual solvent in the exhaust gas, and adjust the spray volume and centrifuge status according to the concentration of residual solvent;

[0044] Furthermore, monitoring equipment is used to measure the concentration of residual solvent in the exhaust gas. If the concentration of residual solvent exceeds the preset threshold, the spray volume is increased. At the same time, if the escape risk index continues to be greater than or equal to 2, the centrifuge is forcibly started (regardless of whether the phospholipid content exceeds the standard).

[0045] The technical solutions described in the above embodiments of this application have at least the following technical effects or advantages: the graded processing mechanism automatically switches processing schemes according to the magnitude of the migration risk index, thereby achieving effective control and removal of hazardous substances (such as pesticide residues) in degumming oil, reducing hazardous substance residues, improving the quality and safety of degumming oil, monitoring key quality parameters of degumming oil in real time, ensuring that phospholipid content and acid value are within a controllable range, monitoring and predicting solvent escape risk in real time, taking timely emergency measures through the graded response mechanism to suppress solvent escape, achieving cross-system data linkage, optimizing solvent absorption effect, improving solvent recovery rate, and reducing production costs and environmental pollution.

[0046] Example 2: While Example 1 described a single solvent, this example uses a mixed solvent for monitoring. This maintains a balance between the polar and non-polar solvent ratios in the mixed solvent, improving solvent recovery, reducing system energy consumption, and ensuring the safety and stability of the production process. Figure 2 As shown.

[0047] S201, Use detection equipment to detect the concentration of each solvent in the mixed solvent and calculate the proportion of solvent in the recovery solvent tank;

[0048] Specifically, online gas chromatographs are installed at the exhaust gas emission pipe and the solvent recovery tank, respectively. These online gas chromatographs are used to detect the concentration of each solvent in the mixed solvent, which includes a non-polar solvent (n-hexane) and a polar solvent (ethyl acetate). The non-polar solvent has a symmetrical molecular structure with overlapping positive and negative charge centers and a zero dipole moment. The polar solvent has an asymmetrical molecular structure with non-overlapping positive and negative charge centers and a dipole moment. The detection cycle of the online gas chromatograph is set to capture the dynamic changes in the solvent ratio in a timely manner. After each detection cycle, the online gas chromatograph outputs the detection data of the n-hexane and ethyl acetate concentrations in the exhaust gas. Based on the detection data of the n-hexane and ethyl acetate concentrations, the concentration ratio of n-hexane to ethyl acetate in the solvent recovery tank is calculated using the following formula: ,in, This indicates the concentration ratio of n-hexane to ethyl acetate in the solvent recovery tank. It reflects the relative content of polar and non-polar solvents in the mixed solvent. If the calculated R... s =2.5, which means that in the current solvent recovery tank, the concentration of n-hexane is 2.5 times the concentration of ethyl acetate. C h This indicates the concentration of n-hexane in the exhaust gas. n-Hexane is a non-polar solvent; its concentration change during the degumming oil absorption process reflects the distribution of non-polar solvents in the system. C e This indicates the concentration of ethyl acetate in the exhaust gas. Ethyl acetate is a polar solvent, and its concentration change reflects the distribution of polar solvents in the system.

[0049] S202, calculate the proportion deviation based on the concentration of the mixed solution, and adjust the system parameters based on the proportion deviation;

[0050] Furthermore, based on the production process requirements and solvent absorption characteristics, a target ratio is set. The concentration ratio in the recovered solvent tank calculated in step S201 is used as the real-time solvent ratio. The ratio deviation is calculated based on the real-time solvent ratio and the set solvent ratio, using the following formula: Where ΔR is the proportion deviation, it represents the degree of difference between the current solvent proportion and the target proportion. When ΔR is positive, it indicates that the proportion of n-hexane in the current solvent is relatively too high, and the polar solvent ethyl acetate is insufficient; when ΔR is negative, it indicates that the proportion of ethyl acetate in the current solvent is relatively too high, and the non-polar solvent n-hexane is insufficient. s R represents the real-time solvent ratio. t This indicates the target ratio to be set.

[0051] When ΔR > 0.2, it is determined that the polar solvent is insufficient. At this time, the system will quickly send a series of instructions to start the auxiliary tower absorption module and trigger the feeding module to perform feeding operations. The auxiliary tower absorption module is mainly used to absorb the polar solvent ethyl acetate. After the start instruction is issued, the spray device of the auxiliary tower starts to work, spraying polyethylene glycol (PEG) solution into the auxiliary tower. Utilizing the affinity of PEG for polar solvents, the ethyl acetate is targeted for capture, thereby increasing the content of polar solvent in the system. After receiving the instruction, the feeding module starts to precisely control the replenishment rate of ethyl acetate according to the preset algorithm and parameters, and replenishes the polar solvent to the recovery solvent tank to quickly correct the solvent ratio imbalance. When ΔR < -0.2, it is determined that the non-polar solvent is insufficient. The system will send instructions to enhance the operating parameters of the main tower absorption module. The main tower absorption module is mainly used to absorb the non-polar solvent n-hexane. By increasing the spray volume of the main tower, Q = s × (1 + |ΔR|), where Q represents the spray volume of the main tower, k is the basic coefficient (in this embodiment, s = 16), and the basic coefficient is an empirical value determined through long-term production practice and experimentation based on various factors such as the design parameters of the main tower, the flow rate of the degumming oil, and the absorption characteristics of the solvent. ΔR is the proportional deviation. This increases the contact opportunity and absorption efficiency between the degumming oil and the non-polar solvent, thereby increasing the content of non-polar solvent in the system and restoring the balance of the solvent ratio. When |ΔR ≤ 0.2, the system is determined to be in a balanced state. At this time, the system will maintain the current operating parameters and will not make any additional adjustments to the main tower, auxiliary tower absorption module, or feeding module, thus maintaining the stable operation of the production process.

[0052] S203, adjust the feeding module based on the ratio deviation and the concentration of ethyl acetate in the recovery solvent tank;

[0053] Specifically, the feeding module monitors the ratio deviation and the ethyl acetate concentration in the recovery solvent tank in real time. When ΔR > 0.2 for 2 minutes and the concentration of C in the recovery solvent tank is... eWhen the concentration is <15%, the replenishment module is triggered. For a duration of ΔR > 0.2 for 2 minutes, the system has a built-in timer to track the duration of ΔR > 0.2. Replenishment is only triggered when the duration of ΔR continuously greater than 0.2 reaches 2 minutes. To avoid accidental triggering of replenishment due to brief fluctuations in ΔR and to improve system stability and reliability, this mechanism is used for C in the solvent recovery tank. e <15%, the system will monitor C in real time e The value is compared to the set threshold of 15%. When C e When the concentration is below 15%, it indicates that the content of polar solvent in the solvent recovery tank is too low, requiring replenishment to increase its content and maintain solvent ratio balance. Once the replenishment conditions are met, the replenishment module calculates the opening of the pneumatic proportional valve based on the value of ΔR. The calculation formula is: K = ΔR × 50, where K represents the opening of the pneumatic proportional valve, which determines the ethyl acetate replenishment rate. The value of K is directly proportional to ΔR; the larger ΔR is, the more severe the solvent ratio imbalance, and the more ethyl acetate needs to be added. Therefore, the opening of the pneumatic proportional valve is larger. Based on the calculated K value, the system further calculates the ethyl acetate replenishment rate using the formula Q. a =K×50, where Q a The replenishment rate of ethyl acetate reflects the volume of ethyl acetate added to the recovery solvent tank per unit time, enabling precise control of the replenishment rate. Based on the calculated replenishment rate, the replenishment module precisely controls the opening of the pneumatic proportioning valve to achieve stable replenishment of ethyl acetate. During the replenishment process, the system continuously monitors changes in the concentration and proportion deviation of ethyl acetate. When the concentration of ethyl acetate reaches a suitable range and the proportion deviation approaches zero, the system automatically stops the replenishment operation to maintain the balance of polar solvent proportions in the mixed solvent, ensuring the stability of the production process and the consistency of product quality.

[0054] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: solving the problem of selective imbalance in degumming oil absorption, maintaining the ratio balance of polar and non-polar solvents in the mixed solvent, improving solvent recovery rate, reducing system energy consumption, ensuring the safety and stability of the production process, and shortening the system response delay through dynamic feeding algorithm and real-time monitoring system, enabling timely response to solvent ratio imbalance problems, reducing secondary risks, and reducing system energy consumption by optimizing the dual-tower absorption and feeding modules, thereby improving energy utilization efficiency and reducing production costs.

[0055] Example 3: Based on the above examples, after replacing traditional mineral oil with degumming oil, metal contamination occurs. This example reduces metal contamination through dielectric regulation and static electricity elimination, such as... Figure 3 As shown.

[0056] S301 collects electrostatic voltage and metal concentration in real time, and performs dielectric regulation based on the collected data;

[0057] Furthermore, a quantum electrostatic induction matrix is ​​used to continuously monitor the electrostatic voltage on the filler layer surface. A spectral scanner scans the heavy metal concentration in the oil film every 5 seconds. When the detected electrostatic voltage or heavy metal concentration exceeds a set threshold, dielectric regulation is applied. Dielectric regulation is a technique that controls physical processes such as electric field distribution, charge transport, or energy storage by changing the dielectric properties of the material (such as dielectric constant and conductivity). In this embodiment, dielectric regulation includes eliminating static electricity and neutralizing charges. The central processing unit sends an activation command to the power control module of the nano-conductive coating via a control signal line. The command includes parameters such as the magnitude of the applied voltage (12V DC) and the duration. After receiving the command, the power control module quickly adjusts the output voltage to apply 12V DC to the nano-conductive coating. At the same time, the current and voltage changes of the coating are monitored in real time to ensure the stability and accuracy of the applied voltage. During the coating's energization process, the surface resistance of the coating is monitored in real time using a built-in resistance measurement module. When the surface resistance drops sharply to 10²Ω... Upon confirmation that the nano-conductive coating has been successfully activated, static electricity can be rapidly dissipated through the coating, achieving the effect of eliminating static electricity. The central processing unit sends a start command to the pulsed electron beam emitter, which includes parameters such as electron flow energy (5keV), frequency (100Hz), and emission duration. After receiving the command, the pulsed electron beam emitter automatically adjusts its internal parameters to ensure that the emitted electron flow meets the requirements. At the same time, it performs pre-emission calibration operations, checking the performance indicators such as electron beam focusing, direction, and energy distribution to ensure that the electron beam can accurately neutralize the positive charge in the oil film. The emitter is then started, emitting a reverse electron flow according to the set parameters. During the emission process, specialized monitoring equipment monitors the electron beam's intensity, energy, and direction in real time to ensure the stability and effectiveness of the electron beam in neutralizing the positive charge in the oil film.

[0058] S302, based on the obtained metal concentration, identify metal micelles in the oil film and separate them from the medium;

[0059] Specifically, the metal micelles are tiny clusters of heavy metal ions or heavy metal nanoparticles aggregated through physical or chemical processes (such as electrostatic adsorption, coordination bonding, van der Waals forces, etc.). These micelles exist in the oil film in a dispersed or aggregated state. Due to their small size and high surface activity, they can easily cause pollution or damage to the environment or equipment. When the detected metal concentration is greater than the preset activation threshold, the magnetic field is activated. The magnetic field module is equipped with a cooling device. When the cooling device is activated, the superconducting coil is cooled. After the superconducting coil is cooled to 4.2K, a current is applied to the superconducting coil to generate a 0.5T pulsed magnetic field. During the generation of the pulsed magnetic field, the coordinate data of the heavy metal micelles in the oil film are acquired in real time by an X-ray fluorescence metal detector. The magnetic field module dynamically adjusts the distribution and intensity of the magnetic field according to the target area information of the heavy metal micelles, focusing the magnetic field on the target area containing the metal micelles. By precisely controlling the current distribution and magnetic field direction in the superconducting coil, high energy density focusing of the magnetic field in the target area is achieved. This focused magnetic field can enhance the magnetic adsorption of heavy metal flocs, separating the metal flocs from the medium, and then activate the negative pressure suction system to transport the separated metal flocs to the hazardous waste solidification reactor.

[0060] S303, the separated metal colloids are processed;

[0061] Furthermore, after the metal flocs are separated, the negative pressure suction system is activated. This system, through pre-set pipelines and suction parameters, generates a strong negative pressure suction force, transporting the separated metal flocs to the hazardous waste solidification reactor. Cement is then mixed with the metal flocs at a weight ratio of 1:10. The weighed metal flocs and cement are placed together into the reactor, and the reactor's stirring device is activated to ensure thorough and uniform mixing. During stirring, the speed and time must be controlled to ensure optimal mixing. This solidification process firmly encapsulates the metal flocs within the solidified cement, effectively preventing secondary pollution of heavy metals during subsequent processing or storage. Continuous monitoring of electrostatic voltage is performed. When the detected electrostatic voltage exceeds 15kV, the system automatically triggers a linkage mechanism. At this time, the system sends a specific command signal to the solvent ratio adjustment system. Upon receiving the command, the solvent ratio adjustment system immediately and forcibly adjusts the solvent ratio according to a preset program, adjusting the target solvent ratio R. t The ratio is set to 8:2, which increases the proportion of non-polar solvents in the solvent mixture.

[0062] The technical solutions in the above embodiments of this application have at least the following technical effects or advantages: breaking the three-stage contamination chain from dielectric regulation → micelle formation → final disposal, achieving more comprehensive contamination control, avoiding solvent-metal micelle contamination caused by high-speed collisions of solvent molecules, and being linked with the solvent ratio control system through a cross-system collaborative layer, which can promptly respond to the risks of electrostatic and heavy metal contamination, thereby improving the safety of the production process.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A system for absorbing and desorbing soybean oil extraction tail gas, characterized in that, include: The system includes an identification module, an absorption module, a magnetic field module, and a feeding module. The identification module is used to identify hazardous substances, and the specific identification steps are as follows: S101, collects risk data in real time, and calculates the migration risk index based on the risk data, using the following formula: ,in, Indicates the migration risk index. This indicates the chlorpyrifos concentration in the degumming oil. This indicates a deviation in acid value. This indicates the concentration of chlorpyrifos in the exhaust gas. This represents an adjustment constant for chlorpyrifos concentration, preventing calculation failure when C=0. A reference constant representing the concentration of chlorpyrifos in exhaust fumes, used to correct for exhaust gas detection limits. , and These represent the weights of chlorpyrifos concentration, acid value deviation, and exhaust gas chlorpyrifos concentration, respectively. The absorption parameters are adjusted according to the migration risk index to classify the risk. This classification includes a two-layer treatment strategy: the first layer is adsorption treatment, and the second layer is adsorption and photocatalysis treatment. A threshold range is set based on historical risk data, including a minimum threshold and a maximum threshold. When the migration risk index is less than the minimum threshold, it is a low-risk level, and the current system parameters are maintained. When the migration risk index is greater than or equal to the minimum threshold but less than the maximum threshold, it is a medium-risk level, and system parameters are dynamically adjusted based on real-time monitoring data. When the migration risk index is greater than or equal to the maximum threshold, it is a high-risk level, and the system operation is stopped for a comprehensive overhaul. S102, collect pressure data and valve status data of the absorption tower in the absorption module, and calculate the escape risk index using the following formula: ,in, Indicates the escape risk index. Indicates the inlet pressure of the absorption tower. This represents the basic risk multiplication factor. This represents the pressure normalization coefficient. Indicates real-time phospholipid content. The normalization coefficient of phospholipid content is used to classify escape risk levels according to the escape index, which are divided into low risk, medium risk and high risk. Low risk is achieved by switching the ventilation system to low power operation mode, medium risk by increasing the ventilation system air volume, and high risk by adjusting the ventilation system air volume to the maximum. S103 monitors the concentration of residual solvent in the exhaust gas and adjusts the spray volume and centrifuge status according to the concentration of residual solvent.

2. The soybean oil extraction tail gas absorption and desorption system as described in claim 1, characterized in that, The replenishment module is used to replenish the solvent, and the specific replenishment method is as follows: S201, Use detection equipment to detect the concentration of each solvent in the mixed solvent and calculate the proportion of solvent in the recovery solvent tank; S202, calculate the proportion deviation based on the concentration of the mixed solution, and adjust the system parameters based on the proportion deviation; S203, adjust the feeding module based on the ratio deviation and the concentration of ethyl acetate in the recovery solvent tank.

3. The soybean oil extraction tail gas absorption and desorption system as described in claim 2, characterized in that, The mixed solvent includes a nonpolar solvent and a polar solvent. The nonpolar solvent has a symmetrical molecular structure with the centers of positive and negative charges coinciding and a dipole moment of zero. The polar solvent has an asymmetrical molecular structure with the centers of positive and negative charges not coinciding and a dipole moment.

4. The soybean oil extraction tail gas absorption and desorption system as described in claim 2, characterized in that, The formula for calculating the solvent ratio in the solvent recovery tank is: ,in, This indicates the concentration ratio of n-hexane to ethyl acetate in the solvent recovery tank, reflecting the relative content of polar and non-polar solvents in the mixed solvent. This indicates the concentration of n-hexane in the exhaust gas. This indicates the concentration of ethyl acetate in the exhaust gas.

5. The soybean oil extraction tail gas absorption and desorption system as described in claim 1, characterized in that, The magnetic field module is used to identify metal colloids in the oil film. The steps for identifying metal colloids are as follows: S301 collects electrostatic voltage and metal concentration in real time, and performs dielectric regulation based on the collected data; S302, based on the obtained metal concentration, identify metal micelles in the oil film and separate them from the medium; S303 processes the separated metal colloids.

6. The soybean oil extraction tail gas absorption and desorption system as described in claim 5, characterized in that, The dielectric control includes eliminating static electricity and neutralizing charge. Eliminating static electricity involves applying a direct current to the coating to reduce the surface resistance of the coating and conduct away static electricity. Neutralizing charge involves activating a pulsed electron beam emitting device to emit a reverse electron flow to neutralize the positive charge in the oil film.

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