Novel tail gas absorption and desorption system for soybean oil leaching

Abstract

The invention discloses a novel soybean oil leaching tail gas absorption and analysis system which comprises an identification module, an absorption module, a magnetic field module and a material supplementing module, the identification module is used for identifying risk objects, and the specific identification steps are as follows: collecting risk data in real time, calculating a migration risk index based on the risk data, and calculating the migration risk index based on the migration risk index; adjusting an absorption parameter according to the migration risk index; collecting pressure data and valve state data of an absorption tower in the absorption module, calculating an escape risk index, and dividing escape risk grades according to the escape index; the concentration of the residual solvent in the tail gas is monitored, the spraying amount and the state of the centrifugal machine are adjusted according to the concentration of the residual solvent, and the treatment scheme is automatically switched according to the migration risk index through a stage treatment mechanism, so that the risk substances in the degummed oil are effectively controlled and removed, the risk substance residues are reduced, and the quality and safety of the degummed oil are improved.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas absorption from oil extraction, and in particular to a novel tail gas absorption and analysis system for soybean oil extraction. Background Art

[0002] Soybean oil extraction is a core technology in the modern oil and fat industry. It achieves efficient oil extraction through extraction with organic solvents (such as n-hexane). The process encompasses three key steps: raw material pretreatment, oil extraction, and solvent recovery. The pretreatment stage involves cleaning, crushing, and flaking to enhance raw material permeability. The leaching stage involves thorough mixing of the raw material with the solvent, dissolving the oil and forming a mixed oil. The solvent recovery stage involves evaporation and distillation to separate the solvent and oil, ultimately yielding crude soybean oil. The extraction method offers high oil yields (residual oil content in meal is less than 1%), and the solvent can be recycled, significantly reducing production costs. However, it requires refining to remove residual solvent to meet national standards (≤10 mg / kg). Off-gas treatment is a key challenge in the extraction process. Off-gases primarily originate from non-condensable gases entrained in the raw material during the extraction process and from solvent evaporation, containing solvent vapor and a small amount of VOCs. Solvents are highly volatile and toxic. Direct discharge not only pollutes the environment but also results in approximately one-third solvent loss, increasing production costs.

[0003] Traditional exhaust systems generally use mineral oil for self-circulation during absorption and analysis. During this process, a certain amount of mineral oil will enter the leaching system through volatilization or entrainment. This part of the mineral oil will enter the solvent and participate in leaching, and cannot be removed through normal process means, resulting in the detection of mineral oil components in edible oil. At the same time, long-term high-temperature self-circulation causes problems such as impurities and deterioration of the mineral oil, which requires regular replenishment and replacement, and has a high cost of use. The above problems have always been the difficulties and pain points of the industry. Summary of the Invention

[0004] The present application provides a novel exhaust gas absorption and analysis system for soybean oil extraction, which automatically switches the treatment scheme according to the size of the migration risk index through a graded treatment mechanism, thereby achieving effective control and removal of risk substances in degummed oil, reducing the residual risk substances, and improving the quality and safety of the degummed oil.

[0005] The present application provides a novel tail gas absorption and analysis 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 risky objects. The specific identification steps are as follows: S101, collecting risk data in real time, calculating a migration risk index based on the risk data, and adjusting absorption parameters according to the migration risk index; S102, collecting pressure data and valve status data of the absorption tower in the absorption module, calculating the escape risk index, and classifying the escape risk level according to the escape index; S103, monitoring the concentration of the residual solvent in the tail gas, and adjusting the spraying amount and the centrifuge state according to the concentration of the residual solvent.

[0006] Preferably, the formula for calculating the migration risk index is: ,in, represents the migration risk index, Indicates the concentration of chlorpyrifos, Indicates the acid value deviation, Indicates the concentration of chlorpyrifos in tail gas, Indicates the adjustment constant of chlorpyrifos concentration to avoid calculation failure when C=0. The reference constant representing the concentration of chlorpyrifos in tail gas is used to correct the detection limit of tail gas. 、 and denote the weight of chlorpyrifos concentration, the weight of acid value deviation and the weight of chlorpyrifos concentration in tail gas, respectively, and + + =1.

[0007] Preferably, the risk is graded 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; when the migration risk index is greater than or equal to the maximum threshold, it is a high risk level.

[0008] Preferably, the hierarchical treatment comprises a two-layer treatment strategy, the first layer being an adsorption treatment and the second layer being an adsorption and photocatalytic treatment.

[0009] Preferably, the formula for calculating the escape risk index is: ,in, represents the escape risk index, Indicates the absorption tower inlet pressure, represents the basic risk multiplication factor, represents the pressure normalization coefficient, Indicates real-time phospholipid content, represents the normalization coefficient of phospholipid content.

[0010] Preferably, the feeding module is used to feed the solvent, and the specific feeding method is: S201, using a detection device to detect the concentration of each solvent in the mixed solvent and calculate the ratio of the solvent in the recovery solvent tank; S202, calculating a proportional deviation according to the concentration of the mixed solution, and adjusting system parameters based on the proportional deviation; S203, adjusting the feeding module based on the ratio deviation and the concentration of ethyl acetate in the recovery solvent tank.

[0011] Preferably, the mixed solvent includes a non-polar solvent and a polar solvent, the molecular structure of the non-polar solvent is symmetrical, the positive and negative charge centers coincide, and the dipole moment is zero; the molecular structure of the polar solvent is asymmetrical, the positive and negative charge centers do not coincide, and a dipole moment exists.

[0012] Preferably, the formula for calculating the proportion of solvent in the recovery solvent tank is: , where R s It represents the concentration ratio of n-hexane to ethyl acetate in the recovery solvent tank, reflecting the relative content of polar and non-polar solvents in the mixed solvent. h Indicates the concentration of n-hexane in the tail gas, C e Indicates the concentration of ethyl acetate in the tail gas.

[0013] Preferably, the magnetic field module is used to identify metal micelles in the oil film, and the steps of identifying the metal micelles are: S301, collecting electrostatic voltage and metal concentration in real time, and performing dielectric control based on the collected data; S302, identifying metal micelles in the oil film based on the obtained metal concentration and separating them from the medium; S303, processing the separated metal colloids.

[0014] Preferably, the dielectric regulation includes eliminating static electricity and neutralizing charges. The static elimination is to apply direct current to the coating to reduce the surface resistance of the coating and achieve the loss of static electricity. The charge neutralization is to start a pulse electron beam emission device to emit a reverse electron flow to neutralize the positive charge in the oil film.

[0015] One or more technical solutions provided in this application have at least the following technical effects or advantages: a hierarchical treatment mechanism automatically switches treatment solutions according to the size of the migration risk index, thereby achieving effective control and removal of risk substances (such as pesticide residues) in degummed oil, reducing risk substance residues, improving the quality and safety of degummed oil, real-time monitoring of key quality parameters of degummed oil, ensuring that phospholipid content and acid value are within a controllable range, real-time monitoring and prediction of solvent escape risks, and timely taking emergency measures through a hierarchical response mechanism to suppress solvent escape, achieving cross-system data linkage, optimizing solvent absorption effects, improving solvent recovery rates, and reducing production costs and environmental pollution; Solve the problem of degummed oil absorption selectivity imbalance, maintain the ratio balance of polar and non-polar solvents 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 the system response delay, can promptly respond to the problem of solvent ratio imbalance, and reduce secondary risks. By optimizing the dual-tower absorption and feeding modules, the system energy consumption is reduced, energy utilization efficiency is improved, and production costs are reduced. By breaking the pollution chain in three stages, from dielectric regulation → floc formation → final disposal, more comprehensive pollution control is achieved, avoiding solvent-metal floc pollution caused by high-speed collisions of solvent molecules. By linking with the solvent ratio control system through the cross-system collaboration layer, it can respond to the risks of static electricity and heavy metal pollution in a timely manner, thereby improving the safety of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic flow chart of a novel tail gas absorption and analysis system for soybean oil extraction according to the present invention; Figure 2 Schematic diagram of the feed method of the present invention; Figure 3 Schematic diagram of the process of identifying metal micelles according to the present invention. DETAILED DESCRIPTION

[0017] To facilitate understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0018] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0020] Example 1: Figure 1 This is a flow chart of a novel tail gas absorption and analysis system for soybean oil extraction according to an embodiment of the present invention, comprising: an identification module, an absorption module, a magnetic field module, and a feeding module. The identification module is used to identify risky objects. The specific identification steps are as follows: S101, collecting risk data in real time, calculating a migration risk index based on the risk data, and adjusting absorption parameters according to the migration risk index; Specifically, risk data in degummed oil is collected by sensors, wherein the risk data includes chlorpyrifos concentration, acid value data, exhaust chlorpyrifos concentration, and phospholipid content. For the acid value data, a standard acid value is set according to the production process and industry standards. The collected acid value data of the degummed 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, the acid value deviation, and the exhaust chlorpyrifos concentration. The migration risk index is used to assess the risk data level and its dynamic change 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, a bypass valve is opened, the degummed oil is introduced into a centrifuge, the centrifuge is started, the speed and time are adjusted, and the phospholipid content of the oil product after centrifugation is re-measured. If the phospholipid content meets the standard, the degummed oil is returned to the main line for continued production. If the phospholipid content still exceeds the standard, the centrifugation process is repeated.

[0021] The risk is graded according to the calculated migration risk index, and a threshold range is set according to historical risk data. 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, indicating that the migration risk of risk substances in the degummed oil is within an acceptable range. Therefore, the various parameters of the current system are maintained, and the monitoring frequency is adjusted to once an hour, that is, the chlorpyrifos concentration, tail gas chlorpyrifos concentration and acid value deviation data are collected once an hour, and the migration risk index is updated. 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. According to the real-time monitored data, the system parameters are dynamically adjusted. For example, if the migration risk index increases due to an increase in the chlorpyrifos concentration, the adsorption effect is enhanced, and part of the tail gas discharged from the top of the absorption tower is returned to the treatment In the system, the content of risk substances in the exhaust gas is reduced by re-processing, the impact on the environment is further reduced, the monitoring frequency is increased, and the migration risk index is updated. When the migration risk index is greater than or equal to the maximum threshold, it is a high-risk level. The system is stopped and a comprehensive overhaul is carried out on the system. The adsorption performance is checked and the spray flow is adjusted through the spray valve to assist in improving the solvent absorption effect. The graded treatment includes two layers of treatment strategies. The first layer is adsorption treatment. According to the set parameters, the activated carbon felt voltage is adjusted so that the activated carbon felt is at the first layer treatment adsorption intensity to adsorb risk substances in the degummed oil. The second layer is adsorption and photocatalytic treatment. The activated carbon felt voltage is adjusted to twice the first layer treatment voltage to enhance the adsorption capacity of the activated carbon felt. The power of the ultraviolet lamp is adjusted to use photocatalysis to further degrade the pesticide residues in the degummed oil.

[0022] The absorption module is used to absorb the concentration of residual solvent in the tail gas, and uses an infrared spectrometer to detect the residual solvent concentration in the tail gas in real time. Solvent molecules will produce characteristic absorption peaks under the irradiation of 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 tail gas, and transmits the concentration value of the residual solvent detected by the infrared spectrometer in real time to the control system. By comparing it with the preset qualified concentration range, it is evaluated whether the current solvent absorption effect meets the standard. If the concentration value of the residual solvent is within the qualified range, it means that the solvent absorption effect is good and the production process is operating normally; if the concentration value of the residual solvent exceeds the qualified range, it means that the solvent absorption effect is not good, and the spray parameters of the absorption tower are adjusted to increase the spray volume of the absorption tower. The spray volume of the absorption tower is automatically adjusted according to the concentration value of the residual solvent, and a mechanism for resetting the baseline amount every 24 hours is set. Within a 24-hour period, the system dynamically adjusts the spray volume according to the real-time monitored residual solvent concentration value to cope with various changes that may occur in the production process. When 24 At the end of the hourly cycle, the system will automatically reset the spray volume to the initial baseline value, and then restart adaptive adjustments based on changes in the concentration of residual solvents. The periodic reset mechanism ensures that the spray parameters are always in the optimal state, which can not only ensure the solvent absorption effect, but also avoid unnecessary waste of resources 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.

[0023] S102, collecting absorption tower pressure data and valve status data, calculating the escape risk index, and classifying the escape risk level according to the escape index; The escape risk index refers to an indicator calculated based on pressure and quality fluctuations for quantifying the risk of solvent escape. Solvent escape refers to the increase in the instantaneous escape of solvent caused by system pressure fluctuations when switching the degummed oil supply or starting and stopping the equipment, which can cause transient pollution. A pressure sensor is used to measure the pressure data at the absorption tower inlet. A valve opening sensor is set at the bypass valve and the spray valve in step S101. The valve opening sensor measures the opening data of the bypass valve and the opening data of the spray valve. The phospholipid content and acid value data are used as quality fluctuation parameters to obtain the quality fluctuation parameters. The received pressure data, bypass valve opening data, spray valve opening data and quality fluctuation parameters are cleaned, different data formats are converted into a unified data format, and the obtained data is stored in the InfluxDB time series database.

[0024] Whether the risk is being processed in step S101 is identified by the bypass valve and the acid value deviation value. The bypass valve is usually used to adjust the flow distribution of the medium in the system. Under normal production conditions, the bypass valve is in a closed state and the bypass valve opening is equal to zero. At this time, the medium is mainly transmitted and processed according to the preset process. When the bypass valve opening is greater than zero, it means that the medium is diverted to the bypass channel, changing the flow state and pressure distribution of the medium in the system, thereby affecting the stability of the entire system and the quality of the product; the acid value deviation value is an indicator of the free fatty acid content in substances such as oils and fats, which reflects the quality and stability of the product. During the production process, the acid value should be kept within a relatively stable range. When the acid value deviation value is greater than the threshold value, it means that the acid value of the product has changed significantly due to unstable raw material quality, improper reaction conditions, etc. Large fluctuations in acid prices can affect product performance and service life, and also increase the risk of system abnormalities, such as solvent escape. When either the bypass valve opening is greater than zero or the acid price fluctuation value is greater than the threshold, it indicates that the system is processing the risk. At this time, the basic risk multiplier is set to 1.5. By increasing the value of the basic risk multiplier, the escape risk index can be increased accordingly, thereby issuing a risk warning earlier and reminding operators to take corresponding measures to reduce the risk. When the bypass valve opening is zero and the acid price deviation value is less than or equal to the threshold, it indicates that the system is in normal production and no risk is being processed. At this time, the basic risk multiplier 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.

[0025] The escape risk index is calculated based on stress data, basic risk multiplier and phospholipid content. The formula is: ,in, It represents the escape risk index, which is used to quantify the risk of solvent escape. The larger the value, the higher the escape risk. Indicates the absorption tower inlet pressure, which is monitored in real time by the pressure sensor of the working condition sensing layer. Indicates the basic risk multiplication factor, which is determined according to the valve status and quality fluctuations and is used to adjust the calculation results of the risk index. Represents the pressure normalization coefficient, which is used to map the pressure P to a relatively reasonable value range. The specific value is determined based on actual process experience, historical data analysis and expert evaluation. Indicates the real-time phospholipid content as one of the quality fluctuation parameters. It represents the normalization coefficient of phospholipid content, which is used to convert the phospholipid content into a relative value. The specific value can also be determined based on actual process experience, historical data analysis and expert evaluation.

[0026] The escape risk level is divided according to the escape risk index. When the calculated escape risk index R < 1.0, it is judged to be low risk. At this time, the system operation state is relatively stable and the possibility of solvent escape is small. By switching the ventilation system to low-power operation mode, energy consumption is reduced, and the zeolite rotor enters standby state. The zeolite rotor is an adsorption device. The speed is adjusted to maintain basic operation to prevent equipment stagnation and reduce unnecessary energy consumption. When 1.0≤R <2.0, it is judged to be medium risk, indicating that the system has certain potential risks. It is necessary to pay close attention to the operation status of the system and take corresponding measures for prevention and adjustment in time. The air volume of the ventilation system is increased, indoor air circulation is strengthened, the concentration of harmful gases is reduced, the speed of the zeolite rotor is increased, the adsorption capacity of harmful gases is enhanced, and the indoor air quality meets safety standards. The activated carbon adsorption box bypass is opened to allow part of the gas to be initially adsorbed by the activated carbon to further reduce the content of harmful gases. When R≥2.0 When it is judged as high risk, the possibility of system abnormality is high, and the risk of solvent escape is high. Emergency measures need to be taken immediately to avoid accidents. The ventilation system air volume is adjusted to the maximum to ensure rapid renewal of indoor air and reduce the peak concentration of harmful gases. The speed of the zeolite wheel is further increased to fully adsorb residual harmful gases to prevent them from spreading to the surrounding environment. The solvent recovery pump is turned on to transport the residual solvent in the system to the solvent recovery tank through a pipeline. A condenser is installed in the recovery tank to condense the solvent vapor into liquid for subsequent processing or reuse. At the same time, the sound and light alarm device is activated to remind on-site personnel to pay attention to safety and initiate emergency plans, such as evacuating personnel and shutting down related equipment.

[0027] S103, monitoring the concentration of residual solvent in the tail gas, and adjusting the spraying amount and centrifuge status according to the concentration of the residual solvent; Furthermore, monitoring equipment is used to measure the concentration of residual solvents in the exhaust gas. If the concentration of residual solvents exceeds a 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 forced to start (regardless of whether the phospholipid content exceeds the standard).

[0028] The technical solutions in the above-mentioned embodiments of the present application have at least the following technical effects or advantages: the hierarchical treatment mechanism automatically switches the treatment scheme according to the size of the migration risk index, thereby achieving effective control and removal of risk substances (such as pesticide residues) in the degummed oil, reducing the residual risk substances, improving the quality and safety of the degummed oil, and real-time monitoring of key quality parameters of the degummed oil to ensure that the phospholipid content and acid value are within a controllable range. The risk of solvent escape is monitored and predicted in real time, and emergency measures are taken in a timely manner through a hierarchical response mechanism to suppress solvent escape, realize cross-system data linkage, optimize solvent absorption effect, improve solvent recovery rate, and reduce production costs and environmental pollution.

[0029] Example 2: The above example 1 describes a single solvent. This example monitors a mixed solvent to maintain a balanced ratio of polar and non-polar solvents in the mixed solvent, improve the solvent recovery rate, reduce system energy consumption, and ensure the safety and stability of the production process. Figure 2 shown.

[0030] S201, using a detection device to detect the concentration of each solvent in the mixed solvent and calculate the ratio of the solvent in the recovery solvent tank; Specifically, an online gas chromatograph is installed at the tail gas emission pipeline and the recovery solvent tank, respectively, and the online gas chromatograph is used to detect the concentration of each solvent in the mixed solvent. The mixed solvent includes a non-polar solvent (n-hexane) and a polar solvent (ethyl acetate). The molecular structure of the non-polar solvent is symmetrical, the positive and negative charge centers coincide, and the dipole moment is zero. The molecular structure of the polar solvent is asymmetrical, the positive and negative charge centers do not coincide, and a dipole moment exists. The detection cycle of the online gas chromatograph is set so that it can capture the dynamic changes of the solvent ratio in a timely manner. After each detection cycle, the online gas chromatograph outputs the detection data of the n-hexane concentration and the ethyl acetate concentration in the tail gas. The concentration ratio of n-hexane to ethyl acetate in the recovery solvent tank is calculated based on the detection data of the n-hexane concentration and the ethyl acetate concentration. The formula is: , where R s Indicates the concentration ratio of n-hexane to ethyl acetate in the recovery solvent tank, which reflects the relative content of polar and non-polar solvents in the mixed solvent. If the calculated R s =2.5, it means that in the current recovery solvent tank, the concentration of n-hexane is 2.5 times that of ethyl acetate, C h Indicates the concentration of n-hexane in the tail gas. N-hexane is a non-polar solvent. During the degummed oil absorption process, its concentration change reflects the distribution of the non-polar solvent in the system. C e It indicates the concentration of ethyl acetate in the tail gas. Ethyl acetate is a polar solvent. Its concentration change reflects the distribution of the polar solvent in the system.

[0031] S202, calculating a proportional deviation according to the concentration of the mixed solution, and adjusting system parameters based on the proportional deviation; Furthermore, according to the production process requirements and the 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. The formula is: , where △R is the ratio deviation, which indicates the degree of difference between the current solvent ratio and the target ratio. When △R is positive, it means that the proportion of n-hexane in the current solvent is relatively high and the polar solvent ethyl acetate is insufficient; when △R is negative, it means that the proportion of ethyl acetate in the current solvent is relatively high and the non-polar solvent n-hexane is insufficient.s Indicates the real-time solvent ratio, R t Indicates setting a target ratio.

[0032] When the calculated ΔR > 0.2, the polar solvent is insufficient. At this point, the system quickly sends a series of instructions to activate 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. When the start command is issued, the auxiliary tower's spray device begins to operate, spraying polyethylene glycol (PEG) solution into the auxiliary tower. Utilizing the affinity of polyethylene glycol for polar solvents, it achieves targeted capture of ethyl acetate, thereby increasing the polar solvent content in the system. After receiving the command, the feeding module begins to precisely control the ethyl acetate replenishment rate according to the preset algorithm and parameters, replenishing the polar solvent to the recovery solvent tank to quickly correct the solvent ratio imbalance. When ΔR < −0.2, the non-polar solvent is insufficient, and the system sends instructions to increase the operating parameters of the main tower absorption module, which 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, and in this embodiment, s=16. The basic coefficient is an empirical value determined in long-term production practice and experimental processes based on a variety of factors such as the design parameters of the main tower, the flow rate of the degummed oil, and the absorption characteristics of the solvent. ΔR is the proportional deviation. This improves the contact opportunity and absorption efficiency between the degummed oil and the non-polar solvent, thereby increasing the content of the 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 equilibrium. At this time, the system will maintain the current operating parameters of the system, and no additional adjustments will be made to the main tower, auxiliary tower absorption module, and feeding module to maintain stable operation of the production process.

[0033] S203, adjusting the feeding module based on the ratio deviation and the concentration of ethyl acetate in the recovery solvent tank; 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 C e <15%, the feeding module is triggered. If ΔR>0.2 for 2 minutes, the system has a built-in timer to count the duration of ΔR>0.2. Only when ΔR is continuously greater than 0.2 for 2 minutes, in order to avoid false triggering of feeding operation due to short ΔR fluctuations and improve the stability and reliability of the system, the C in the recovery solvent tank is e <15%, the system will monitor the C e The value is compared with the set threshold value of 15%. eWhen it is lower than 15%, it means that the content of polar solvent in the recovery solvent tank is too low, and it is necessary to increase its content by feeding to maintain the balance of the solvent ratio. When the above feeding conditions are met, the feeding module calculates the opening of the pneumatic proportional valve according to the value of ΔR. The calculation formula is: K=ΔR×50, where K represents the opening of the pneumatic proportional valve, which determines the size of the ethyl acetate feeding acceleration rate. The value of K is proportional to ΔR. The larger the ΔR, the more serious the imbalance of the solvent ratio, and the more ethyl acetate needs to be added. Therefore, the opening of the pneumatic proportional valve is also larger. According to the calculated K value, the system further calculates the ethyl acetate feeding acceleration rate. The calculation formula is Q a =K×50, where Q a The ethyl acetate feed rate reflects the volume of ethyl acetate added to the recovery solvent tank per unit time, enabling precise control of the ethyl acetate feed rate. The feed module uses the calculated ethyl acetate feed rate to precisely control the opening of the pneumatic proportional valve, ensuring stable ethyl acetate addition. During the feed process, the system continuously monitors changes in ethyl acetate concentration and proportional deviation. When the ethyl acetate concentration reaches the appropriate range and the proportional deviation approaches zero, the system automatically stops feeding to maintain the balanced ratio of polar solvents in the mixed solvent, ensuring production process stability and consistent product quality.

[0034] The technical solutions in the above-mentioned embodiments of the present application have at least the following technical effects or advantages: solving the problem of imbalance in degummed oil absorption selectivity, maintaining the proportional balance of polar and non-polar solvents in the mixed solvent, improving the solvent recovery rate, reducing system energy consumption, ensuring the safety and stability of the production process, and the dynamic feeding algorithm and real-time monitoring system shorten the system response delay, can promptly respond to the problem of solvent ratio imbalance, reduce secondary risks, and by optimizing the dual-tower absorption and feeding modules, reduce system energy consumption, improve energy utilization efficiency, and reduce production costs.

[0035] Example 3: Based on the above example, after the traditional mineral oil is replaced with degummed oil, metal contamination is formed. This example reduces metal contamination by dielectric regulation and eliminating static electricity, such as Figure 3 shown.

[0036] S301, collecting electrostatic voltage and metal concentration in real time, and performing dielectric control based on the collected data; Furthermore, a quantum electrostatic induction matrix is ​​used to continuously monitor the electrostatic voltage on the surface of the filler layer. A spectral scanner scans the heavy metal concentration in the oil film every 5 seconds. When the detected electrostatic voltage is greater than a set threshold or the heavy metal concentration is greater than a set threshold, the dielectric is regulated. Dielectric regulation is a technical means of controlling physical processes such as electric field distribution, charge transfer, or energy storage by changing the dielectric properties of the material (such as dielectric constant, conductivity, etc.). In this embodiment, dielectric regulation includes eliminating static electricity and neutralizing charges. The central processing unit sends an activation instruction to the power control module of the nano-conductive coating through a control signal line. The instruction includes parameters such as the magnitude of the applied voltage (12V DC) and the duration. After receiving the instruction, the power control module quickly adjusts the output voltage and applies 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 power-on process of the coating, the surface resistance of the coating is monitored in real time using the built-in resistance measurement module. When the surface resistance drops sharply to 10²Ω When the nano-conductive coating is successfully activated, it is confirmed that static electricity can be quickly dissipated through the coating, achieving the effect of eliminating static electricity. The central processing unit sends a startup command to the pulsed electron beam emitter. The command contains parameters such as the 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-launch calibration operations, checks the electron beam's focus, direction, and energy distribution, and other performance indicators to ensure that the electron beam can accurately neutralize the positive charge in the oil film. The emitter is then started to emit a reverse electron flow according to the set parameters. During the emission process, specialized monitoring equipment is used to monitor the electron beam's intensity, energy, and direction in real time to ensure the stability and effectiveness of the electron beam and neutralize the positive charge in the oil film.

[0037] S302, identifying metal micelles in the oil film based on the obtained metal concentration and separating them from the medium; Specifically, the metal colloids are tiny cluster structures formed by the aggregation of heavy metal ions or heavy metal nanoparticles through physical or chemical effects (such as electrostatic adsorption, coordination bonding, van der Waals forces, etc.). These colloids exist in the oil film in a dispersed or aggregated state. Due to their small size and high surface activity, they are prone to polluting or damaging the environment or equipment. When the detected metal concentration is greater than a preset activation threshold, the magnetic field is activated, and a cooling device is provided in the magnetic field module. The cooling device is started to cool the superconducting coil. After the superconducting coil is cooled to 4.2K, current is applied to the superconducting coil to generate a 0.5T pulsed magnetic field. During the pulsed magnetic field generation process, the coordinate data of the heavy metal colloids in the oil film is obtained in real time through an X-ray fluorescence metal detector. The magnetic field module dynamically adjusts the distribution and intensity of the magnetic field based on the target area information of the heavy metal colloids, focusing the magnetic field on the target area containing the metal colloids. 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 flocculation, separate the metal flocculation from the medium, start the negative pressure suction system, and transport the separated metal flocculation to the hazardous waste solidification reactor.

[0038] S303, processing the separated metal colloids; Furthermore, after the metal floccules are separated, the negative pressure suction system is started. The negative pressure suction system generates a strong negative pressure attraction through pre-set pipelines and suction parameters to transport the separated metal floccules to the hazardous waste solidification reactor, and mix the cement with the metal floccules. The specific ratio is that the metal floccules and cement are mixed in a weight ratio of 1:10. The weighed metal floccules and cement are placed together in the hazardous waste solidification reactor, and the stirring device of the reactor is started to fully mix the two. The stirring speed and time need to be controlled during the stirring process to ensure the best mixing effect. Through this solidification treatment, the metal micro-clusters are firmly wrapped in the cement solid body, effectively preventing heavy metals from secondary pollution during subsequent treatment or storage. The electrostatic voltage is continuously monitored. When the electrostatic voltage value exceeds 15kV, the system automatically triggers the linkage mechanism. At this time, the system sends a specific command signal to the solvent ratio adjustment system. After receiving the command, the solvent ratio adjustment system immediately adjusts the solvent ratio according to the preset program to adjust the solvent target ratio R t The ratio is set to 8:2, that is, the proportion of the non-polar solvent in the solvent mixture is increased.

[0039] The technical solutions in the above-mentioned embodiments of the present application have at least the following technical effects or advantages: the pollution chain is broken in three steps from dielectric regulation → floc formation → final disposal, thereby achieving more comprehensive pollution control, avoiding solvent-metal floc pollution caused by high-speed collisions of solvent molecules, and linking with the solvent ratio control system through the cross-system collaborative layer, thereby being able to respond to the risks of static electricity and heavy metal pollution in a timely manner, thereby improving the safety of the production process.

[0040] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations are readily apparent to those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A novel tail gas absorption and analysis system for soybean oil extraction, characterized in that: include: Identification module, absorption module, magnetic field module and feeding module. The identification module is used to identify risk objects. The specific identification steps are as follows: S101, collecting risk data in real time, calculating a migration risk index based on the risk data, and adjusting absorption parameters according to the migration risk index; S102, collecting pressure data and valve status data of the absorption tower in the absorption module, calculating the escape risk index, and classifying the escape risk level according to the escape index; S103, monitoring the concentration of the residual solvent in the tail gas, and adjusting the spraying amount and the centrifuge state according to the concentration of the residual solvent.

2. A novel tail gas absorption and analysis system for soybean oil extraction according to claim 1, characterized in that: The formula for calculating the migration risk index is: ,in, represents the migration risk index, Indicates the concentration of chlorpyrifos, Indicates the acid value deviation, Indicates the concentration of chlorpyrifos in tail gas, Indicates the adjustment constant of chlorpyrifos concentration to avoid calculation failure when C=0. The reference constant representing the concentration of chlorpyrifos in tail gas is used to correct the detection limit of tail gas. 、 and denote the weight of chlorpyrifos concentration, the weight of acid value deviation and the weight of chlorpyrifos concentration in tail gas, respectively, and + + =1.

3. A novel tail gas absorption and analysis system for soybean oil extraction according to claim 1, characterized in that: The risk is graded 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; When the migration risk index is greater than or equal to the maximum threshold, it is a high risk level.

4. A novel tail gas absorption and analysis system for soybean oil extraction as claimed in claim 3, characterized in that: The hierarchical treatment includes a two-layer treatment strategy, the first layer is adsorption treatment, and the second layer is adsorption and photocatalytic treatment.

5. A novel tail gas absorption and analysis system for soybean oil extraction as claimed in claim 1, characterized in that: The formula for calculating the escape risk index is: ,in, represents the escape risk index, Indicates the absorption tower inlet pressure, represents the basic risk multiplication factor, represents the pressure normalization coefficient, Indicates real-time phospholipid content, represents the normalization coefficient of phospholipid content.

6. A novel tail gas absorption and analysis system for soybean oil extraction according to claim 1, characterized in that: The feeding module is used to feed the solvent, and the specific feeding method is: S201, using a detection device to detect the concentration of each solvent in the mixed solvent and calculate the ratio of the solvent in the recovery solvent tank; S202, calculating a proportional deviation according to the concentration of the mixed solution, and adjusting system parameters based on the proportional deviation; S203, adjusting the feeding module based on the ratio deviation and the concentration of ethyl acetate in the recovery solvent tank.

7. A novel tail gas absorption and analysis system for soybean oil extraction according to claim 6, characterized in that: The mixed solvent includes a non-polar solvent and a polar solvent. The molecular structure of the non-polar solvent is symmetrical, the positive and negative charge centers coincide, and the dipole moment is zero; the molecular structure of the polar solvent is asymmetrical, the positive and negative charge centers do not coincide, and a dipole moment exists.

8. A novel tail gas absorption and analysis system for soybean oil extraction according to claim 6, characterized in that: The formula for calculating the proportion of solvent in the recovery solvent tank is: , where R s It represents the concentration ratio of n-hexane to ethyl acetate in the recovery solvent tank, reflecting the relative content of polar and non-polar solvents in the mixed solvent. h Indicates the concentration of n-hexane in the tail gas, C e Indicates the concentration of ethyl acetate in the tail gas.

9. A novel tail gas absorption and analysis system for soybean oil extraction according to claim 1, characterized in that: The magnetic field module is used to identify metal micelles in the oil film. The steps of identifying metal micelles are as follows: S301, collecting electrostatic voltage and metal concentration in real time, and performing dielectric control based on the collected data; S302, identifying metal micelles in the oil film based on the obtained metal concentration and separating them from the medium; S303, processing the separated metal colloids.

10. A novel tail gas absorption and analysis system for soybean oil extraction according to claim 9, characterized in that: The dielectric regulation includes eliminating static electricity and neutralizing charges. The static elimination is to apply direct current to the coating to reduce the surface resistance of the coating and achieve the loss of static electricity. The charge neutralization is to start the pulse electron beam emission device to emit reverse electron flow to neutralize the positive charge in the oil film.

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