A fish oil refining thin film evaporation process control method, system and storage medium

Abstract

The application relates to a fish oil refining thin film evaporation process control method, a system and a storage medium, relates to the technical field of fish oil refining, and comprises the following steps: collecting a thin film evaporation trigger signal of fish oil; in response to the thin film evaporation trigger signal, a preset segmented scraper is rotated to force fish oil to form a liquid film on a preset heating wall surface; collecting a scraper state parameter and a liquid film state parameter; analyzing the scraper state parameter and the liquid film state parameter to generate a heat transfer hysteresis risk value; judging whether the heat transfer hysteresis risk value meets the requirement of a preset heat transfer hysteresis risk threshold value; if yes, the cycle judgment of the scraper state parameter and the liquid film state parameter is continued; if not, the segmented scraper is adjusted according to the scraper state parameter and the liquid film state parameter, and the adjusted segmented scraper is controlled to rotate to force fish oil to form a liquid film on the heating wall surface. The application has the effect of improving the quality of fish oil refining thin film evaporation.

Description

Technical Field

[0001] This application relates to the technical field of fish oil refining, and in particular to a method, system and storage medium for controlling the thin-film evaporation process of fish oil refining. Background Technology

[0002] Thin-film evaporation is a key step in the physical refining and high-value production of fish oil, mainly used to remove free fatty acids, oxidation products, off-flavor substances, moisture, and low-molecular-weight impurities.

[0003] In related technologies, the thin-film evaporation process in fish oil refining is usually carried out using a thin-film evaporator. The pretreated fish oil is injected from the top of the thin-film evaporator, and the scraper rotates at high speed, thereby uniformly distributing the fish oil into a turbulent liquid film of a certain thickness. The liquid film is rapidly heated on the heated wall surface, and the light components vaporize instantly and enter the condenser through a short path to be collected, while the unevaporated high-boiling-point components are discharged as the bottom stream and enter the next process.

[0004] Regarding the aforementioned technologies, when the scraper deforms or wears, the distance between the scraper and the heated wall changes. As a result, the thickness of the liquid film formed by the scraper's rotation on the heated wall is uneven, causing localized excessively thick liquid films. In this case, heat transfer lags in the excessively thick liquid film area, creating an overheated region inside the liquid film. Since the unsaturated fatty acids in fish oil are highly heat-sensitive materials, they are easily oxidized and decomposed in the overheated region, producing trans fatty acids. This results in the loss of the high added value of fish oil, leading to low quality of fish oil refining film evaporation, and there is still room for improvement. Summary of the Invention

[0005] To improve the quality of thin-film evaporation in fish oil refining, this application provides a method, system, and storage medium for controlling the thin-film evaporation process in fish oil refining.

[0006] In a first aspect, this application provides a method for controlling the thin-film evaporation process in fish oil refining, employing the following technical solution: A method for controlling the thin-film evaporation process in fish oil refining includes: Collect the trigger signal for thin-film evaporation of fish oil; In response to a thin film evaporation trigger signal, a preset segmented scraper is rotated to force fish oil to form a liquid film on a preset heated wall surface; Collect scraper status parameters and liquid film status parameters; The scraper state parameters and liquid film state parameters are analyzed to generate heat transfer hysteresis risk values; Determine whether the heat transfer hysteresis risk value meets the preset heat transfer hysteresis risk threshold. If the conditions are met, continue to collect scraper state parameters and liquid film state parameters for iterative judgment; If the conditions are not met, the segmented scraper is adjusted according to the scraper state parameters and liquid film state parameters, and the adjusted segmented scraper is rotated to force the fish oil to form a liquid film on the heated wall surface.

[0007] Optionally, the steps of analyzing scraper state parameters and liquid film state parameters to generate heat transfer hysteresis risk values ​​include: Determine the real-time rotational speed of the scraper based on the scraper status parameters; The real-time viscosity, real-time flow rate, and real-time density of fish oil are determined based on the liquid film state parameters. The real-time rotation speed of the scraper, the real-time viscosity of the fish oil, the real-time flow rate of the fish oil, and the real-time density of the fish oil are substituted into the preset liquid film thickness model for calculation to generate the standard liquid film thickness. The standard thickness and state parameters of the liquid film are analyzed to generate a heat transfer hysteresis risk value.

[0008] Optionally, the steps of analyzing the standard thickness of the liquid film and the liquid film state parameters to generate a heat transfer hysteresis risk value include: Determine the real-time thickness and temperature of the liquid film based on the liquid film state parameters; Calculate the quotient of the real-time liquid film thickness and the standard liquid film thickness to generate the liquid film thickness risk coefficient; Collect the heating temperature of the liquid film; The real-time temperature of the liquid film, the heating temperature of the liquid film, and the preset stable temperature of the fish oil are analyzed to generate a temperature risk coefficient. Calculate the product of the liquid film thickness risk factor and the temperature risk factor to generate the heat transfer hysteresis risk value.

[0009] Optionally, the steps of analyzing the real-time temperature of the liquid film, the heating temperature of the liquid film, and the preset stable temperature of the fish oil to generate a temperature risk coefficient include: Calculate the difference between the liquid film heating temperature and the real-time liquid film temperature to generate the heating temperature difference; Calculate the difference between the stable temperature of fish oil and the real-time temperature of the liquid film to generate a stable temperature difference; Calculate the quotient between the heating temperature difference and the stable temperature difference to generate a temperature risk coefficient.

[0010] Optionally, the steps for adjusting the segmented scraper based on scraper state parameters and liquid film state parameters include: Determine the scraper defect conditions based on the scraper state parameters and liquid film state parameters; The scraper defect condition is determined to be either the preset excessive gap defect condition or the preset local damage defect condition. If the defect is due to excessive gap, the contact force between the segmented scraper and the heated wall should be adjusted to ensure uniform liquid film thickness. If the damage is localized, then collect the parameters of the damaged scraper. Adjust the segmented scrapers according to the parameters of the damaged scraper.

[0011] Optionally, the step of adjusting the contact force between the segmented scraper and the heated wall surface to ensure uniform liquid film thickness includes: The current viscosity of the fish oil is determined based on the liquid film state parameters, and the scraper linear velocity and current scraper rotation speed are determined based on the scraper state parameters. The current viscosity of the fish oil, the linear velocity of the scraper, and the current rotation speed of the scraper are substituted into the preset contact force model for calculation to generate the standard gap contact force. Control the segmented scraper to contact the heated wall surface and collect real-time contact force; Determine whether the real-time contact force meets the requirements of the standard gap contact force; If it does not meet the requirements, continue to control the segmented scraper to contact the heated wall surface and collect the real-time contact force for cyclic judgment; If the conditions are met, the segmented scraper will be locked.

[0012] Optionally, the steps for adjusting the segmented scraper according to the damaged scraper parameters include: Determine the serial number and quantity of the damaged scraper based on the parameters of the damaged scraper. Control the recycling of the segmented scrapers corresponding to the serial numbers of the damaged scrapers; Collect the thickness of the standard liquid film; The number of damaged scrapers, the thickness of the standard liquid film, and the liquid film state parameters were analyzed to generate the scraper compensation speed. Determine the compensation scraper number based on the damaged scraper number; Adjust the speed of the segmented scrapers corresponding to the scraper compensation scraper number according to the scraper compensation speed.

[0013] Optionally, the steps of analyzing the number of damaged scrapers, the thickness of the standard liquid film, and the liquid film state parameters to generate the scraper compensation speed include: The number of damaged scrapers and the preset total number of scrapers are analyzed to determine the quantity and rotation speed adjustment coefficient; Determine the current thickness of the liquid film and the current flow rate of the fish oil based on the liquid film state parameters; Calculate the quotient of the current liquid film thickness and the standard liquid film thickness to generate the thickness rotation speed adjustment coefficient; Calculate the quotient between the current fish oil flow rate and the preset standard fish oil flow rate to generate a flow rate and rotation speed adjustment coefficient; The scraper compensation speed is generated by multiplying the quantity speed adjustment coefficient, thickness speed adjustment coefficient, flow rate speed adjustment coefficient, and preset reference speed.

[0014] Secondly, this application provides a fish oil refining thin-film evaporation process control system, which adopts the following technical solution: A fish oil refining thin-film evaporation process control system includes: The acquisition module is used to acquire thin film evaporation trigger signals, scraper status parameters, and liquid film status parameters; A memory for storing a program for controlling a fish oil refining thin-film evaporation process as described in any of the preceding claims; The processor and the program in the memory can be loaded and executed by the processor to implement a fish oil refining thin film evaporation process control method as described in any of the above.

[0015] Thirdly, this application provides a computer storage medium capable of storing corresponding programs, which facilitates improving the quality of thin-film evaporation in fish oil refining, and adopts the following technical solution: A computer-readable storage medium storing a computer program that can be loaded by a processor and executed any of the above-described fish oil refining thin-film evaporation process control methods.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. When the heat transfer hysteresis risk value does not meet the requirements of the heat transfer hysteresis risk threshold, the segmented scraper is adjusted according to the scraper state parameters and liquid film state parameters. This allows the adjusted segmented scraper to force the fish oil to be evenly distributed on the heated wall surface at a standard thickness to form a liquid film, ensuring that the liquid film does not form an overheated area that causes oxidation and decomposition, thereby improving the quality of fish oil refining film evaporation. 2. The liquid film thickness risk coefficient is obtained by calculating the quotient of the real-time liquid film thickness and the standard liquid film thickness. The temperature risk coefficient is obtained by analyzing the real-time liquid film temperature, the liquid film heating temperature and the fish oil stabilization temperature. The product of the liquid film thickness risk coefficient and the temperature risk coefficient is then calculated to obtain the heat transfer hysteresis risk value, thereby improving the accuracy of the heat transfer hysteresis risk value. 3. When the scraper defect condition is determined to be an excessive gap defect condition, the contact force between the segmented scraper and the heated wall surface is adjusted to adjust the gap between the segmented scraper and the heated wall surface, ensuring uniform liquid film thickness. When the scraper defect condition is determined to be a local damage defect condition, the segmented scraper corresponding to the damaged scraper number is controlled to be recovered, and the speed of the segmented scraper corresponding to the compensation scraper number is adjusted according to the scraper compensation speed to prevent the damaged segmented scraper from continuing to force fish oil to form a liquid film, thereby improving the quality of fish oil refining film evaporation. Attached Figure Description

[0017] Figure 1 This is a flowchart of a method for controlling the thin-film evaporation process of fish oil refining, as described in an embodiment of this application.

[0018] Figure 2 This is a flowchart of the steps in this application embodiment to analyze the scraper state parameters and liquid film state parameters to generate a heat transfer hysteresis risk value.

[0019] Figure 3 This is a flowchart of the steps in this application embodiment to analyze the standard thickness of the liquid film and the liquid film state parameters to generate a heat transfer hysteresis risk value.

[0020] Figure 4 This is a flowchart of the steps in this application embodiment to analyze the real-time temperature of the liquid film, the heating temperature of the liquid film, and the preset stable temperature of the fish oil to generate a temperature risk coefficient.

[0021] Figure 5 This is a flowchart of the steps for adjusting the segmented scraper according to the scraper state parameters and liquid film state parameters in an embodiment of this application.

[0022] Figure 6 This is a flowchart of the steps in this application embodiment to adjust the contact force between the segmented scraper and the heated wall surface to make the liquid film thickness uniform.

[0023] Figure 7 This is a flowchart of the steps for adjusting the segmented scraper according to the parameters of the damaged scraper in this embodiment of the application.

[0024] Figure 8 This is a flowchart of the steps in this application embodiment to analyze the number of damaged scrapers, the thickness of the standard liquid film, and the liquid film state parameters to generate the scraper compensation speed. Detailed Implementation

[0025] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figures 1 to 8 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0026] Reference Figure 1 This application discloses a method for controlling the thin-film evaporation process in fish oil refining, comprising the following steps: Step S100: Collect the film evaporation trigger signal of fish oil.

[0027] The thin-film evaporation trigger signal is the signal that initiates the thin-film evaporation process of the fish oil. In one embodiment, it is directly input by the operator into the processing terminal. In another embodiment, when the fish oil enters the thin-film evaporator, the fish oil infrared sensor at the inlet detects the entry of the fish oil and sends the thin-film evaporation trigger signal to the processing terminal. By detecting the thin-film evaporation trigger signal, a timing signal is provided for the thin-film evaporation process of the fish oil.

[0028] Step S101: In response to the thin film evaporation trigger signal, control the rotation of the preset segmented scraper to force the fish oil to form a liquid film on the preset heated wall surface.

[0029] In this process, after the processing terminal receives the thin film evaporation trigger signal, it responds to the signal by controlling the segmented scraper to rotate according to the preset standard rotation speed. The segmented scraper then scrapes the fish oil entering the thin film evaporator onto the heated wall surface, thereby forming a liquid film of uniform thickness. Under the heating effect of the heated wall surface, the light components of the liquid film instantly vaporize and enter the condenser through a short path for collection, while the unevaporated high-boiling-point components are discharged as the bottom stream.

[0030] A segmented scraper is a device used to spread fish oil onto a heated wall surface to form a liquid film. Multiple segmented scrapers are installed according to the height of the thin-film evaporator; taking three as an example, each segment includes a scraper, an independent motor, a telescopic mechanism, and a detection component. The scraper is connected to the output shaft of the independent motor via a main shaft. The scraper is driven to rotate by the independent motor, and multiple scrapers are evenly distributed along the rotation direction of the independent motor. The scraper can be made of food-grade wear-resistant polytetrafluoroethylene composite material. The telescopic mechanism can be a miniature cylinder, mounted on the main shaft, while the scraper is mounted on the output end of the telescopic mechanism, thus controlling the gap between the scraper and the heated wall surface. The detection component refers to a combination of sensors used to detect the state parameters of the liquid film and the scraper; specific types are detailed in the following steps and will not be elaborated upon here.

[0031] Heated wall refers to the device used in fish oil refining to evaporate the liquid film. The cylinder wall of the thin film evaporator adopts a jacket design, and a heat-conducting medium at a certain temperature is introduced into the cylinder wall to make the cylinder wall reach a certain temperature and form a heated wall, so as to evaporate the liquid film on the cylinder wall.

[0032] Step S102: Collect scraper status parameters and liquid film status parameters.

[0033] Among them, the scraper state parameters refer to the parameters that affect the thickness of the liquid film formed by the segmented scraper forcing fish oil to form. The types of parameters and the detection methods are as detailed in the following steps, which will not be elaborated here.

[0034] Liquid film state parameters refer to parameters that affect the thickness of the liquid film. The types of parameters and detection methods are detailed in the following steps and will not be elaborated here.

[0035] Step S103: Analyze the scraper state parameters and liquid film state parameters to generate heat transfer hysteresis risk values.

[0036] Among them, the heat transfer hysteresis risk value is a risk index used to indicate whether heat transfer hysteresis will occur in the liquid film. The higher the heat transfer hysteresis risk value, the greater the risk of heat transfer hysteresis in the liquid film. It is obtained by the processing terminal after analyzing the scraper state parameters and liquid film state parameters. The specific method is described in [reference needed]. Figure 2 The steps.

[0037] Step S104: Determine whether the heat transfer hysteresis risk value meets the requirements of the preset heat transfer hysteresis risk threshold.

[0038] Among them, the heat transfer hysteresis risk threshold refers to the minimum risk index at which the liquid film will experience heat transfer hysteresis. Taking 1 as an example, the requirement for the heat transfer hysteresis risk threshold is that it is less than the heat transfer hysteresis risk threshold.

[0039] By processing the terminal to determine whether the heat transfer hysteresis risk value is less than the heat transfer hysteresis risk threshold, it can be determined whether the current liquid film is too thick, causing heat transfer hysteresis in the liquid film and resulting in local overheating.

[0040] Step S1041: If the condition is met, continue to collect scraper status parameters and liquid film status parameters for cyclic judgment.

[0041] If the processing terminal determines that the heat transfer hysteresis risk value is less than the heat transfer hysteresis risk threshold, it indicates that the current liquid film is not too thick and there is no local overheating. Therefore, the scraper status parameters and liquid film status parameters are collected to continuously monitor the status of the segmented scraper and liquid film.

[0042] Step S1042: If it does not meet the requirements, adjust the segmented scraper according to the scraper state parameters and liquid film state parameters, and control the adjusted segmented scraper to rotate to force the fish oil to form a liquid film on the heated wall surface.

[0043] If the processing terminal determines that the heat transfer hysteresis risk value is not less than the heat transfer hysteresis risk threshold, it indicates that the current liquid film is likely to be too thick, leading to localized overheating. Therefore, the segmented scrapers are adjusted according to the scraper state parameters and the liquid film state parameters. The specific method is described in [reference needed]. Figure 5 The steps involve controlling the rotation of the adjusted segmented scraper to force the fish oil to form a liquid film on the heated wall surface, ensuring that the thickness of the liquid film is uniform and consistent with the standard thickness, and preventing the liquid film from being too thick, causing heat transfer lag and local overheating of the liquid film.

[0044] Reference Figure 2 The steps for analyzing the scraper state parameters and liquid film state parameters to generate heat transfer hysteresis risk values ​​include: Step S200: Determine the real-time rotation speed of the scraper based on the scraper status parameters.

[0045] Among them, the real-time rotation speed of the scraper refers to the real-time rotation speed of the segmented scraper, which is detected by the rotation speed sensor in the detection component and uploaded to the processing terminal. The processing terminal stores the real-time rotation speed of the scraper in the database corresponding to the scraper status parameters. When using the real-time rotation speed of the scraper, the processing terminal directly indexes and calls it. By determining the real-time rotation speed of the scraper, data support is provided for the subsequent calculation of the standard thickness of the liquid film at the current moment.

[0046] Step S201: Determine the real-time viscosity, real-time flow rate, and real-time density of the fish oil based on the liquid film state parameters.

[0047] Among them, the real-time viscosity of fish oil refers to the viscosity of fish oil, which reflects the flow resistance of fish oil. It is obtained by the viscosity sensor in the detection component.

[0048] The real-time fish oil flow rate refers to the flow rate of fish oil entering the thin-film evaporator, which is obtained by the flow sensor in the detection component.

[0049] The real-time density of fish oil refers to the density of the fish oil, which is obtained by the density sensor in the detection component.

[0050] After the corresponding sensors in the detection component detect the real-time viscosity, real-time flow rate, and real-time density of the fish oil, they upload the data to the processing terminal. The processing terminal stores the real-time viscosity, real-time flow rate, and real-time density of the fish oil in the database corresponding to the liquid film state parameters. When the real-time viscosity, real-time flow rate, and real-time density of the fish oil are needed, the processing terminal directly indexes and retrieves them. By determining the real-time viscosity, real-time flow rate, and real-time density of the fish oil, data support is provided for subsequent calculation of the standard thickness of the liquid film at the current moment.

[0051] Step S202: Substitute the real-time rotation speed of the scraper, the real-time viscosity of the fish oil, the real-time flow rate of the fish oil, and the real-time density of the fish oil into the preset liquid film thickness model for calculation to generate the standard liquid film thickness.

[0052] The liquid film thickness model refers to a model that calculates the standard thickness of the current liquid film evaporation based on the segmented scraper and the liquid film state. The specific formula is as follows: .

[0053] In the formula, For standard liquid film thickness, This refers to the real-time viscosity of the fish oil. For real-time fish oil flow rate, The preset radius of the thin-film evaporator cylinder, For the real-time density of fish oil, This is the preset gravitational acceleration.

[0054] The standard thickness of the liquid film refers to the optimal evaporation thickness of the liquid film under the current conditions. It is calculated by the processing terminal by substituting the real-time rotation speed of the scraper, the real-time viscosity of the fish oil, the real-time flow rate of the fish oil, and the real-time density of the fish oil into the liquid film thickness model. By determining the standard thickness of the liquid film, data support is provided for quantifying the risk of heat transfer hysteresis in the liquid film from the perspective of thickness.

[0055] Step S203: Analyze the standard thickness of the liquid film and the liquid film state parameters to generate a heat transfer hysteresis risk value.

[0056] The heat transfer hysteresis risk value in this step is consistent with the heat transfer hysteresis risk value in step S103, and is obtained by the processing terminal after analyzing the standard thickness of the liquid film and the liquid film state parameters. The specific method is described in [reference needed]. Figure 3 The steps.

[0057] Reference Figure 3 The steps for analyzing the standard thickness and state parameters of the liquid film to generate a heat transfer hysteresis risk value include: Step S300: Determine the real-time thickness and real-time temperature of the liquid film based on the liquid film state parameters.

[0058] The real-time thickness of the liquid film refers to the thickness of the liquid film, which is obtained by detecting the liquid film using an infrared laser thickness sensor in the detection component.

[0059] The real-time temperature of the liquid film refers to the temperature of the liquid film, which is obtained by the temperature sensor in the detection component after detecting the liquid film.

[0060] After the corresponding sensors in the detection component detect the real-time thickness and temperature of the liquid film, they are uploaded to the processing terminal. The processing terminal stores the real-time thickness and temperature of the liquid film in the database corresponding to the liquid film state parameters. When the real-time thickness and temperature of the liquid film are needed, the processing terminal directly indexes and calls them. By determining the real-time thickness and temperature of the liquid film, data support is provided for subsequent quantification of the risk of liquid film heat transfer hysteresis from the two dimensions of liquid film thickness and temperature.

[0061] Step S301: Calculate the quotient of the real-time liquid film thickness and the standard liquid film thickness to generate the liquid film thickness risk coefficient.

[0062] Among them, the liquid film thickness risk coefficient is an index that quantifies the risk of liquid film heat transfer hysteresis from the thickness dimension. It is obtained by calculating the quotient of the real-time liquid film thickness and the standard liquid film thickness by the processing terminal. The greater the real-time liquid film thickness exceeds the standard liquid film thickness, the greater the risk index of liquid film heat transfer hysteresis.

[0063] Step S302: Collect the liquid film heating temperature.

[0064] The liquid film heating temperature refers to the heating temperature of the liquid film by the heating wall. It is obtained by the temperature sensor in the detection component and sent to the processing terminal. By determining the liquid film heating temperature, data support is provided for the subsequent quantification of the risk of liquid film heat transfer hysteresis from the temperature dimension.

[0065] Step S303: Analyze the real-time temperature of the liquid film, the heating temperature of the liquid film, and the preset stable temperature of the fish oil to generate a temperature risk coefficient.

[0066] The stable temperature of fish oil refers to the stable temperature of unsaturated fatty acids in fish oil. When the temperature exceeds this, the unsaturated fatty acids will rapidly oxidize and decompose into trans fatty acids. This temperature is determined by the operator based on the type of unsaturated fatty acids.

[0067] The temperature risk coefficient is an index that quantifies the risk of liquid film heat transfer hysteresis from a temperature perspective. It is obtained by analyzing the real-time temperature of the liquid film, the heating temperature of the liquid film, and the stable temperature of the fish oil at the treatment terminal. Specific methods are described in [reference needed]. Figure 4 The steps.

[0068] Step S304: Calculate the product of the liquid film thickness risk factor and the temperature risk factor to generate the heat transfer hysteresis risk value.

[0069] The heat transfer hysteresis risk value in this step is the same as the heat transfer hysteresis risk value in step S203, and is obtained by multiplying the liquid film thickness risk coefficient and the temperature risk coefficient calculated by the processing terminal.

[0070] Reference Figure 4 The steps for analyzing the real-time temperature of the liquid film, the heating temperature of the liquid film, and the preset stable temperature of the fish oil to generate a temperature risk coefficient include: Step S400: Calculate the difference between the liquid film heating temperature and the real-time liquid film temperature to generate the heating temperature difference.

[0071] The heating temperature difference refers to the difference between the liquid film temperature and the heating temperature. It is calculated by the processing terminal as the difference between the liquid film heating temperature and the real-time liquid film temperature. The larger the heating temperature difference, the greater the difference between the real-time liquid film temperature and the liquid film heating temperature, and therefore the greater the risk of liquid film heat transfer lag.

[0072] Step S401: Calculate the difference between the stable temperature of the fish oil and the real-time temperature of the liquid film to generate a stable temperature difference.

[0073] Among them, the stable temperature difference refers to the difference between the liquid film temperature and the stable temperature. It is obtained by calculating the difference between the stable temperature of fish oil and the real-time temperature of liquid film from the processing terminal. The larger the stable temperature difference, the lower the probability of oxidative decomposition of liquid film, and the lower the risk of heat transfer lag in liquid film.

[0074] Step S402: Calculate the quotient between the heating temperature difference and the stable temperature difference to generate a temperature risk coefficient.

[0075] The temperature risk coefficient in this step is the same as the temperature risk coefficient in step S303. It is obtained by the processing terminal calculating the quotient between the heating temperature difference and the stable temperature difference. By quantifying the proportion of the heating temperature difference to the stable temperature difference, the higher the proportion, the more severe the heat transfer lag is under the stable temperature difference.

[0076] Reference Figure 5 The steps for adjusting the segmented scraper based on the scraper state parameters and liquid film state parameters include: Step S500: Determine the scraper defect conditions based on the scraper state parameters and liquid film state parameters.

[0077] Among them, scraper defect conditions refer to the parameter conditions that determine the defect type of the segmented scraper, including excessive gap defect conditions and local damage defect conditions.

[0078] The defect condition of excessive gap refers to the conditions under which the gap between the segmented scraper and the heated wall is determined to be too large. These conditions include the overall liquid film thickness being greater than the standard thickness, the scraper gap being greater than the standard gap, and the absence of abnormal signals in the contact force between the scraper and the heated wall. The processing terminal retrieves the scraper contact force, scraper gap, and overall liquid film thickness from the scraper state parameters and liquid film state parameters, respectively, and then compares the scraper contact force, scraper gap, and liquid film thickness with the standard contact force, standard gap, and standard thickness.

[0079] Localized damage conditions refer to the conditions under which a segmented scraper will experience localized damage. These conditions include a localized liquid film thickness greater than the standard thickness, a scraper gap within the error range of the standard gap, and an abnormal signal in the contact force between the scraper and the heated wall. The processing terminal retrieves the scraper contact force, scraper gap, and overall liquid film thickness from the scraper status parameters and liquid film status parameters, respectively, and then compares these parameters with the standard contact force, standard gap, and standard thickness to obtain the results.

[0080] Step S501: Determine whether the scraper defect condition is the preset excessive gap defect condition or the preset local damage defect condition.

[0081] The excessive gap defect condition and the local damage defect condition in this step are consistent with the excessive gap defect condition and the local damage defect condition disclosed in step S500, and will not be repeated here.

[0082] By processing the terminal, the scraper defect conditions are determined to be either excessive gap defects or local damage defects, thereby identifying the causes of uneven or excessive liquid film thickness and providing data support for subsequent control of segmented scraper adjustments.

[0083] Step S5011: If the defect is due to excessive gap, adjust the contact force between the segmented scraper and the heated wall to make the liquid film thickness uniform.

[0084] If the processing terminal determines that the scraper defect condition is due to excessive gap, it indicates that the cause of uneven and excessively thick liquid film thickness is the excessive gap between the segmented scraper and the heated wall surface. Therefore, the contact force between the segmented scraper and the heated wall surface is adjusted to adjust the gap between them, so that the segmented scraper can scrape the fish oil into a liquid film of uniform thickness that meets the standard thickness requirements. The specific method is as follows: Figure 6 The steps.

[0085] Step S5012: If the condition is a localized damage defect, collect the parameters of the damaged scraper.

[0086] If the processing terminal determines that the scraper defect condition is a localized damage defect condition, it indicates that the cause of uneven and excessive liquid film thickness is the damage to the segmented scraper. Therefore, the parameters of the damaged scraper are tested to provide data support for subsequent adjustments to the segmented scraper.

[0087] The parameters of the damaged scraper refer to the relevant parameters of the damaged scraper segments, including the damaged scraper serial number and the number of damaged scrapers. The vision probes in the detection component perform image recognition on the scraper segments they are responsible for to determine when a scraper segment is damaged. The damaged scraper serial number is determined according to the mapping relationship between the vision probe and the scraper segment serial number. Then, the number of damaged scraper serial numbers is counted to obtain the number of damaged scrapers.

[0088] Step S502: Adjust the segmented scraper according to the parameters of the damaged scraper.

[0089] After determining the parameters of the damaged scraper, the processing terminal adjusts the segmented scrapers according to these parameters to prevent the damaged scraper from continuing to scrape the fish oil, which could cause the formed liquid film to become excessively thick in certain areas. The specific method is described in [reference needed]. Figure 7 The steps.

[0090] Reference Figure 6 The step of adjusting the contact force between the segmented scraper and the heated wall surface to ensure uniform liquid film thickness includes: Step S600: Determine the current viscosity of the fish oil based on the liquid film state parameters, and determine the scraper linear velocity and current scraper rotation speed based on the scraper state parameters.

[0091] The current viscosity of the fish oil in this step is the same as the real-time viscosity of the fish oil in step S201, which will not be elaborated here.

[0092] The current rotational speed of the scraper in this step is the same as the real-time rotational speed of the scraper in step S200, and will not be described again here.

[0093] The scraper linear velocity refers to the circumferential linear velocity of the scraper. After detecting the current rotation speed of the scraper, the processing terminal calculates the scraper linear velocity based on the radius of the thin film evaporator cylinder and the current rotation speed of the scraper.

[0094] Step S601: Substitute the current viscosity of the fish oil, the linear velocity of the scraper, and the current rotation speed of the scraper into the preset contact force model for calculation to generate the standard gap contact force.

[0095] The contact force model refers to the model for calculating the contact force when the segmented scraper and the heated wall are at the optimal gap. First, the fish oil contact resistance is obtained by multiplying the current viscosity of the fish oil, the linear velocity of the scraper, and the preset contact area of ​​the scraper and the heated wall. Then, the scraper friction resistance is obtained by multiplying the current rotation speed of the scraper and the preset scraper motion damping coefficient. Finally, the standard gap contact force is obtained by summing the fish oil contact resistance, the scraper friction resistance, and the preset static contact force.

[0096] The contact area of ​​the scraper heating wall surface refers to the area of ​​the scraper when it contacts the heating wall surface, which is determined by the operator based on the actual situation of the scraper and the heating wall surface.

[0097] The scraper motion damping coefficient refers to the degree of resistance of mechanical friction to the scraper motion during the scraper rotation process. In the no-load test of segmented scrapers, the mechanical damping torque at different speeds is recorded and then converted into the scraper motion damping coefficient.

[0098] Static contact force refers to the contact force generated between the scraper and the heated wall surface due to elastic deformation. It is obtained by multiplying the standard gap calculated by the processing terminal, the scraper elastic coefficient, and the contact area between the scraper and the heated wall surface.

[0099] Step S602: Control the segmented scraper to contact the heated wall surface and collect the real-time contact force.

[0100] When it is determined that the gap between the segmented scraper and the heated wall is too large, the processing terminal controls the corresponding telescopic mechanism to move the segmented scraper toward the heated wall according to the set step size, thereby reducing the gap and detecting the real-time contact force, providing data support for subsequent determination of whether the gap between the segmented scraper and the heated wall is qualified.

[0101] Real-time contact force refers to the contact force between the segmented scraper and the heated wall surface, which is detected by the force-sensitive sensor in the detection component and sent to the processing terminal.

[0102] Step S603: Determine whether the real-time contact force meets the requirements of the standard gap contact force.

[0103] The requirement for standard gap contact force means that it is consistent with the standard gap contact force.

[0104] The processing terminal determines whether the real-time contact force is consistent with the standard gap contact force, thereby determining whether the gap between the segmented scraper and the heated wall surface supports the segmented scraper to scrape the fish oil into a liquid film of standard thickness.

[0105] Step S6031: If it does not meet the requirements, continue to control the segmented scraper to contact the heated wall surface and collect the real-time contact force for cyclic judgment.

[0106] If the processing terminal determines that the real-time contact force is inconsistent with the standard gap contact force, it indicates that the gap between the segmented scraper and the heated wall is still too large. Therefore, the segmented scraper is controlled to continue to contact the heated wall, and the real-time contact force is collected to continuously monitor the gap status between the segmented scraper and the heated wall.

[0107] Step S6032: If the condition is met, lock the segmented scraper.

[0108] If the processing terminal determines that the real-time contact force is consistent with the standard gap contact force, it indicates that the gap between the segmented scraper and the heated wall is qualified and can support the segmented scraper to scrape the fish oil into a liquid film with a standard thickness. Therefore, the control telescopic mechanism locks the segmented scraper to prevent the gap between the segmented scraper and the heated wall from changing.

[0109] Reference Figure 7 The steps for adjusting the segmented scraper according to the parameters of the damaged scraper include: Step S700: Determine the serial number and quantity of the damaged scraper based on the parameters of the damaged scraper.

[0110] The damaged scraper serial number and quantity in this step are the same as those in step S5012, and will not be repeated here.

[0111] Step S701: Control the recovery of the segmented scraper corresponding to the damaged scraper number.

[0112] After determining the number of the damaged scraper, the processing terminal controls the corresponding telescopic structure to recycle the corresponding segmented scraper according to the preset recycling distance and recycling direction, thereby keeping the segmented scraper away from the heated wall surface and preventing the segmented scraper from continuing to scrape the fish oil into an uneven liquid film.

[0113] The recovery direction refers to the direction in which the segmented scraper moves away from the heated wall surface. The recovery distance refers to the distance in which the segmented scraper moves away from the heated wall surface.

[0114] Step S702: Collect the thickness of the standard liquid film.

[0115] The standard liquid film thickness in this step is the same as the standard liquid film thickness in step S202, and will not be elaborated here.

[0116] Step S703: Analyze the number of damaged scrapers, the thickness of the standard liquid film, and the liquid film state parameters to generate the scraper compensation speed.

[0117] The scraper compensation speed refers to the rotational speed of the remaining scrapers in the same segment. It is used to compensate for the number of times fish oil can be applied when a damaged scraper cannot apply it. This speed is determined by the processing terminal after analyzing the number of damaged scrapers, the standard liquid film thickness, and the liquid film state parameters. Specific methods are detailed in [reference needed]. Figure 8 The steps.

[0118] Step S704: Determine the compensation scraper number based on the damaged scraper number.

[0119] The compensation scraper number refers to the serial number of the remaining intact scrapers in the same group as the damaged scraper. It is obtained by the processing terminal by finding the serial numbers of the remaining scrapers in the same group based on the serial number of the damaged scraper.

[0120] Step S705: Adjust the rotation speed of the segmented scrapers corresponding to the scraper compensation number according to the scraper compensation rotation speed.

[0121] In this process, after determining the compensation scraper number, the processing terminal controls the corresponding independent motor to adjust to the scraper compensation speed according to the compensation scraper number. This allows the corresponding segmented scraper to make up for the number of times the fish oil is scraped by the damaged scraper, thereby ensuring that the thickness of the liquid film formed by the fish oil meets the standard thickness requirements.

[0122] Reference Figure 8 The steps for analyzing the number of damaged scrapers, the thickness of the standard liquid film, and the liquid film state parameters to generate the scraper compensation speed include: Step S800: Analyze the number of damaged scrapers and the preset total number of scrapers to determine the quantity and rotation speed adjustment coefficient.

[0123] The total number of scrapers refers to the number of scrapers in the same group of segmented scrapers, which is determined by the operator based on the actual situation of the segmented scrapers.

[0124] The quantity and speed adjustment coefficient refers to the adjustment coefficient of the scraper speed based on the reduction of the number of scrapers. The remaining scraper number is obtained by calculating the difference between the total number of scrapers and the number of damaged scrapers at the processing terminal, and then calculating the quotient of the total number of scrapers and the remaining number of scrapers to obtain the quantity and speed adjustment coefficient.

[0125] Step S801: Determine the current thickness of the liquid film and the current flow rate of the fish oil based on the liquid film state parameters.

[0126] The current thickness of the liquid film and the current flow rate of the fish oil in this step are the same as the real-time flow rate of the fish oil in step S201 and the real-time thickness of the liquid film in step S300, and will not be elaborated here.

[0127] Step S802: Calculate the quotient of the current liquid film thickness and the standard liquid film thickness to generate the thickness rotation speed adjustment coefficient.

[0128] The thickness and rotation speed adjustment coefficient refers to the adjustment coefficient of the scraper rotation speed based on the liquid film thickness, which is obtained by calculating the quotient of the current liquid film thickness and the standard liquid film thickness at the processing terminal.

[0129] Step S803: Calculate the quotient of the current fish oil flow rate and the preset standard fish oil flow rate to generate the flow rate and rotation speed adjustment coefficient.

[0130] The standard flow rate of fish oil refers to the standard flow rate of fish oil entering the thin-film evaporator. The specific value is determined by the operator based on the actual situation.

[0131] The flow rate and rotation speed adjustment coefficient refers to the adjustment coefficient of the scraper rotation speed based on the fish oil flow rate. It is obtained by calculating the quotient of the current fish oil flow rate and the standard fish oil flow rate at the processing terminal.

[0132] Step S804: Calculate the product of the quantity speed adjustment coefficient, thickness speed adjustment coefficient, flow rate speed adjustment coefficient and the preset reference speed to generate the scraper compensation speed.

[0133] The reference speed refers to the standard speed when the segmented scraper applies fish oil; the specific value is determined by the operator based on the actual situation.

[0134] The scraper compensation speed in this step is the same as the scraper compensation speed in step S703, and is obtained by multiplying the quantity speed adjustment coefficient, thickness speed adjustment coefficient, flow rate speed adjustment coefficient and reference speed by the processing terminal.

[0135] Based on the same inventive concept, embodiments of this application provide a fish oil refining thin-film evaporation process control system, including: The acquisition module is used to acquire thin film evaporation trigger signals, scraper status parameters, and liquid film status parameters; A memory for storing a program for controlling a fish oil refining thin-film evaporation process; The processor and the program in the memory can be loaded and executed by the processor to implement a method for controlling the thin film evaporation process of fish oil refining.

[0136] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0137] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as a method for controlling a fish oil refining thin-film evaporation process.

[0138] Computer storage media include, for example, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media that can store program code.

[0139] Based on the same inventive concept, this application provides a smart terminal, including a memory and a processor. The memory stores a computer program that can be loaded and executed by the processor to control a fish oil refining thin film evaporation process.

[0140] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0141] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A method for controlling the thin-film evaporation process in fish oil refining, characterized in that, include: Collect the trigger signal for thin-film evaporation of fish oil; In response to a thin film evaporation trigger signal, a preset segmented scraper is rotated to force fish oil to form a liquid film on a preset heated wall surface; Collect scraper status parameters and liquid film status parameters; The scraper state parameters and liquid film state parameters are analyzed to generate heat transfer hysteresis risk values; Determine whether the heat transfer hysteresis risk value meets the preset heat transfer hysteresis risk threshold. If the conditions are met, continue to collect scraper state parameters and liquid film state parameters for iterative judgment; If the conditions are not met, the segmented scraper is adjusted according to the scraper state parameters and liquid film state parameters, and the adjusted segmented scraper is rotated to force the fish oil to form a liquid film on the heated wall surface.

2. The method for controlling the thin-film evaporation process in fish oil refining according to claim 1, characterized in that, The steps for analyzing the scraper state parameters and liquid film state parameters to generate heat transfer hysteresis risk values ​​include: Determine the real-time rotational speed of the scraper based on the scraper status parameters; The real-time viscosity, real-time flow rate, and real-time density of fish oil are determined based on the liquid film state parameters. The real-time rotation speed of the scraper, the real-time viscosity of the fish oil, the real-time flow rate of the fish oil, and the real-time density of the fish oil are substituted into the preset liquid film thickness model for calculation to generate the standard liquid film thickness. The standard thickness and state parameters of the liquid film are analyzed to generate heat transfer hysteresis risk values.

3. The method for controlling the thin-film evaporation process in fish oil refining according to claim 2, characterized in that, The steps for analyzing the standard thickness and state parameters of the liquid film to generate a heat transfer hysteresis risk value include: Determine the real-time thickness and temperature of the liquid film based on the liquid film state parameters; Calculate the quotient of the real-time liquid film thickness and the standard liquid film thickness to generate the liquid film thickness risk coefficient; Collect the heating temperature of the liquid film; The real-time temperature of the liquid film, the heating temperature of the liquid film, and the preset stable temperature of the fish oil are analyzed to generate a temperature risk coefficient. Calculate the product of the liquid film thickness risk factor and the temperature risk factor to generate the heat transfer hysteresis risk value.

4. The method for controlling the thin-film evaporation process in fish oil refining according to claim 3, characterized in that, The steps for analyzing the real-time temperature of the liquid film, the heating temperature of the liquid film, and the preset stable temperature of the fish oil to generate a temperature risk coefficient include: Calculate the difference between the liquid film heating temperature and the real-time liquid film temperature to generate the heating temperature difference; Calculate the difference between the stable temperature of fish oil and the real-time temperature of the liquid film to generate a stable temperature difference; Calculate the quotient between the heating temperature difference and the stable temperature difference to generate a temperature risk coefficient.

5. The method for controlling the thin-film evaporation process in fish oil refining according to claim 1, characterized in that, The steps for adjusting the segmented scraper based on the scraper state parameters and liquid film state parameters include: Determine the scraper defect conditions based on the scraper state parameters and liquid film state parameters; The scraper defect condition is determined to be either the preset excessive gap defect condition or the preset local damage defect condition. If the defect is due to excessive gap, the contact force between the segmented scraper and the heated wall should be adjusted to ensure uniform liquid film thickness. If the damage is localized, then collect the parameters of the damaged scraper. Adjust the segmented scrapers according to the parameters of the damaged scraper.

6. The method for controlling the thin-film evaporation process in fish oil refining according to claim 5, characterized in that, The steps for adjusting the contact force between the segmented scraper and the heated wall surface to ensure uniform liquid film thickness include: The current viscosity of the fish oil is determined based on the liquid film state parameters, and the scraper linear velocity and current scraper rotation speed are determined based on the scraper state parameters. The current viscosity of the fish oil, the linear velocity of the scraper, and the current rotation speed of the scraper are substituted into the preset contact force model for calculation to generate the standard gap contact force. Control the segmented scraper to contact the heated wall surface and collect real-time contact force; Determine whether the real-time contact force meets the requirements of the standard gap contact force; If it does not meet the requirements, continue to control the segmented scraper to contact the heated wall surface and collect the real-time contact force for cyclic judgment; If the conditions are met, the segmented scraper will be locked.

7. The method for controlling the thin-film evaporation process in fish oil refining according to claim 5, characterized in that, The steps for adjusting the segmented scraper based on the parameters of the damaged scraper include: Determine the serial number and quantity of the damaged scraper based on the parameters of the damaged scraper. Control the recycling of the segmented scrapers corresponding to the serial numbers of the damaged scrapers; Collect the thickness of the standard liquid film; The number of damaged scrapers, the thickness of the standard liquid film, and the liquid film state parameters were analyzed to generate the scraper compensation speed. Determine the compensation scraper number based on the damaged scraper number; Adjust the speed of the segmented scrapers corresponding to the scraper compensation scraper number according to the scraper compensation speed.

8. The method for controlling the thin-film evaporation process in fish oil refining according to claim 7, characterized in that, The steps for analyzing the number of damaged scrapers, the thickness of the standard liquid film, and the liquid film state parameters to generate the scraper compensation speed include: The number of damaged scrapers and the preset total number of scrapers are analyzed to determine the quantity and rotation speed adjustment coefficient; Determine the current thickness of the liquid film and the current flow rate of the fish oil based on the liquid film state parameters; Calculate the quotient of the current liquid film thickness and the standard liquid film thickness to generate the thickness rotation speed adjustment coefficient; Calculate the quotient between the current fish oil flow rate and the preset standard fish oil flow rate to generate a flow rate and rotation speed adjustment coefficient; The scraper compensation speed is generated by multiplying the quantity speed adjustment coefficient, thickness speed adjustment coefficient, flow rate speed adjustment coefficient, and preset reference speed.

9. A control system for a fish oil refining thin-film evaporation process, characterized in that, include: The acquisition module is used to acquire thin film evaporation trigger signals, scraper status parameters, and liquid film status parameters; A memory for storing a program for controlling a fish oil refining thin-film evaporation process as described in any one of claims 1 to 8; The processor and the program in the memory can be loaded and executed by the processor to implement the fish oil refining thin film evaporation process control method as described in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that, The computer program is stored and can be loaded by a processor and executed as described in any one of claims 1 to 8, to control a fish oil refining thin-film evaporation process.

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