A method and system for controlling dehydration in sesame oil production

Abstract

The application discloses a kind of sesame oil production dehydration control method and system, belong to sesame oil production control technical field, obtain the pre-oil information of dehydration sesame oil, sedimentation stratification information and initial filtration retentate information, determine free water position, particle entrainment water position and membrane bound water position;According to membrane bound water position, combined with dehydration tank in tank cover observation window, feed short tube root and the temperature change of stirring shaft seal periphery, determine membrane enrichment area and condensation reflux area;After short time vacuum reduction in dehydration initial section, again restore the disturbance treatment of vacuum, collect membrane rupture hole recovery image, bubble crack sound and exhaust steam humidity recovery state, determine the membrane rupture release sequence of membrane bound water;Again generate delay dehydration area, carry out oil surface shallow layer push, condensation reflux area preheating and intermittent membrane rupture dehydration;Through repeated disturbance comparison, determine dehydration end point;The application can reduce the risk of moisture reverse rise, bottle bottom water line and flocculent turbidity after sesame oil filling.

Description

Technical Field

[0001] This invention relates to the field of sesame oil production control technology, specifically to a method and system for controlling the dehydration of sesame oil production. Background Technology

[0002] In the production of water-displacement milled sesame oil or low-temperature pressed sesame oil, a small amount of sesame slurry will still be present in the sesame oil after skimming, settling, and initial filtration. This slurry is not uniformly free water, but is encapsulated by sesame protein, sugar colloids, and fine sesame powder, forming a "film-bound water" that adheres to the oil surface, the edge of the tank wall, and the corners where stirring is difficult.

[0003] Current dehydration control methods typically rely on heating temperature, vacuum level, exhaust humidity, or sampled moisture content to determine the endpoint, making it difficult to identify the release of bound water during the later stages of dehydration. Especially in small-batch production during winter, the temperature at the can lid observation window and the base of the feed pipe is low. Water vapor condenses and flows back along the sesame oil film, easily recombining with unbroken gelatinous water clusters. This results in needle-like water lines at the bottom of the bottle, flocculent turbidity, and rancid aroma after filling and settling, leading to the rework and scrapping of the entire batch of high-grade sesame oil.

[0004] Therefore, there is a need for a dehydration control method in sesame oil production that can identify the relationship between membrane-bound water, condensation reflux, and downstream dehumidification. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for controlling dehydration in sesame oil production, in order to address the shortcomings of the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for controlling dehydration in sesame oil production, comprising: To obtain the pre-processing information, sedimentation and stratification information, and primary filtration residue information of the sesame oil to be dehydrated, the location of free water, particulate water, and membrane-bound water in the sesame oil is determined. Based on the location of water trapped in the film, and combined with the temperature changes at the observation window of the tank cover, the root of the feed pipe, and the area around the seal of the stirring shaft, the film enrichment area and the condensation reflux area during the sesame oil dehydration process are determined. In the initial stage of dehydration, the dehydration tank is subjected to a short-term vacuum reduction followed by a vacuum restoration. During the disturbance process, images of the broken film holes on the oil surface, sounds of bubble bursting, and the recovery status of exhaust humidity are collected. The sequence of the release of water bound by the film is determined based on the images of the broken film holes, sounds of bubble bursting, and the recovery status of exhaust humidity. The sequence of membrane rupture and release is correlated with the membrane enrichment area and the condensation reflux area to generate a sluggish dehydration area for sesame oil. The stirring and heating methods are controlled so that the stirring first pushes the oil in the sluggish dehydration area to the shallow oil surface, then the condensation reflux area is preheated and kept warm, and then the shallow oil surface is intermittently dehydrated by membrane rupture. Repeat the short-term vacuum disturbance process, and compare the recovered images of the membrane rupture holes, the sound of bubble bursting, and the recovery status of exhaust humidity after the repeated processing with the results of the previous processing; when the comparison results show that the membrane rupture holes no longer recover with delay, the sound of bubble bursting no longer appears in a concentrated manner, and the exhaust humidity does not rise, it is determined that the sesame oil has completed dehydration.

[0007] Preferably, determining the location of free water, particle-entrained water, and film-bound water in sesame oil includes the following steps: The oil temperature recorded in the production batch is correlated with the upper oil surface area, the middle suspended area, the lower near-water foot area, and the edge area near the tank wall in the settling tank. Based on the water line formation state after the oil samples in each region have been left to stand, the water droplet precipitation state after heating or centrifugation, and the filamentous film formation state of the oil samples on the sampler surface, candidate positions for free water, particle-entrained water, and film-bound water were obtained respectively.

[0008] Preferably, the modification of candidate positions for water trapped in the film includes the following steps: The primary filter residue that is sheet-like and does not immediately release water under pressure is identified as colloidal residue, and the filter surface position corresponding to the colloidal residue and the time period of entry into the primary filter are recorded. The time period is mapped to the oil outlet layer of the settling tank. When the oil outlet layer has oil surface film, tank wall adhesion or sampler string residue at the same time, the oil outlet layer is mapped to the oil surface edge area, oil inlet impact area or tank wall adhesion area after the dehydration tank feeds. The corresponding oil surface edge area, oil inlet impact area, or tank wall adhesion area are identified as the location of the water-binding film.

[0009] Preferably, determining the film enrichment region and the condensation reflux region includes the following steps: The location of the water bound by the adhesive film is mapped to the edge area of ​​the oil surface and the area of ​​adhesion to the tank wall after the feed is introduced into the dehydration tank, and the continuous boundary of the oil film corresponding to the water bound by the adhesive film is taken as the area to be tracked. During the initial stage of dehydration and heating, maintain low-speed stirring so that the area to be tracked passes sequentially below the observation window of the tank cover, the root of the feed short pipe, and the area around the sealing periphery of the stirring shaft, and simultaneously record the corresponding temperature decrease, temperature stagnation, and temperature rise. The area where the temperature remains stagnant after passing through the tracking area and the corresponding oil surface shows a continuous film formation is identified as the film enrichment area. The corresponding oil surface area below the film enrichment area, where the temperature decreases but does not rise synchronously with the decrease in exhaust humidity, is identified as the condensation reflux area.

[0010] Preferably, recording the temperature decrease, temperature stagnation, and temperature recovery states includes the following steps: Attached temperature measuring points are set at the edge of the observation window on the tank cover, the outer side of the root of the feed pipe, and the periphery of the agitator shaft seal, and the temperature records of each attached temperature measuring point are matched with the oil level image records at the same recording time. When the area to be tracked passes below any attached temperature measuring point, the temperature decrease is recorded as the temperature of the attached temperature measuring point relative to the previous recording time. The temperature stagnation is recorded as the temperature does not rise with the overall temperature rise in the tank during the next two recording times. When the temperature change direction of the attached temperature measuring point returns to the same direction as the exhaust steam temperature change direction, it is recorded as a temperature rise, and the location where the temperature stagnation and film continuation occur simultaneously is used to eliminate the location of ordinary viscous oil film.

[0011] Preferably, the disturbance handling for short-term vacuum reduction followed by vacuum restoration includes the following steps: After the exhaust humidity changes from an initial rise to a gradual rise, reduce the vacuum pump's pumping volume or open the air supply valve without stopping heating and stirring, so that the vacuum level in the dehydration tank is reduced to the point where pinhole-like bulges and local film ruptures only appear on the oil surface in the areas where the film is enriched. When no continuous large bubbles appear in the middle of the oil body, close the air supply valve and restore the vacuum pump's pumping volume to return the dehydration tank to the vacuum state before the disturbance. During the period from the start of vacuum reduction to the completion of vacuum recovery, images of the recovery of ruptured pores, bubbles, and the recovery status of exhaust humidity were continuously collected from the oil surface corresponding to the film enrichment area and the condensation reflux area.

[0012] Preferably, determining the sequence of membrane rupture and release of bound water includes the following steps: Based on the sequence of time after the short-term vacuum reduction begins, the positions of the first appearance of the membrane rupture hole, the adhesion and shrinkage of the hole edge, and the completion of the closure of the membrane rupture hole are ordered to obtain the initial membrane rupture position sequence; Match the bubble bursting sound corresponding to each position in the initial membrane rupture position sequence with the adhesion and shrinkage process at the pore edge, and mark the position where the bubble bursting sound is concentrated and synchronized with the adhesion and shrinkage at the pore edge as the effective water release position; The time of the effective water release location is compared with the state of exhaust steam humidity recovery. The location that is located before the exhaust steam humidity begins to rise and causes the exhaust steam humidity to continue to rise is determined as the first release location. The film rupture release sequence is determined according to the first release location, the subsequent effective water release location, and the location that does not cause the exhaust steam humidity to rise.

[0013] Preferably, the delayed dehydration region for producing sesame oil includes the following steps: The first release position, the subsequent effective water release position, and the position that did not cause a rise in exhaust humidity in the membrane rupture release sequence are respectively mapped to the membrane enrichment area and the condensation reflux area. When the location where the membrane rupture hole first appears coincides with the area where the film is enriched, and there is a condensation reflux area above the location where the membrane rupture hole first appears, the location is recorded as the location to be judged for hysteresis. The effective water release location that occurs after the initial release location, the location where the hole edge still sticks and shrinks during the second disturbance, and the location where there are membrane rupture holes but no increase in exhaust humidity are considered as the components of the delayed dehydration zone.

[0014] Preferably, controlling the stirring and heating methods and determining when the sesame oil has completed dehydration includes the following steps: First, maintain low-speed stirring to move the sluggish dehydration zone along the edge of the oil surface to the observation position, then change the stirring direction to make the oil containing the gum film attached to the tank wall detach from the tank wall and enter the shallow layer of the oil surface; Before the sluggish dehydration zone enters the shallow oil layer, the corresponding condensation reflux zone above it is preheated and kept warm until the temperature of the condensation reflux zone rises as the exhaust steam humidity decreases within two consecutive recording cycles. The sluggish dehydration zone in the shallow layer of the oil surface is subjected to short-term vacuum disturbance treatment again. The image of the broken membrane hole recovery, the sound of bubble cracking and the state of the return of exhaust humidity after repeated treatment are compared with the previous treatment results. When the broken membrane hole no longer recovers with delay, the sound of bubble cracking no longer appears in a concentrated manner and the exhaust humidity does not rise, it is determined that the sesame oil has completed dehydration.

[0015] The present invention also provides a dehydration control system for sesame oil production, comprising: The moisture state positioning module acquires the pre-processing information, sedimentation and stratification information, and primary filtration residue information of the sesame oil to be dehydrated, and determines the location of free water, particulate water, and membrane-bound water in the sesame oil. The film enrichment and condensation reflux identification module determines the film enrichment area and condensation reflux area during the sesame oil dehydration process based on the location of water bound in the film and the temperature changes at the observation window of the tank cover, the root of the feed short pipe, and the periphery of the stirring shaft seal. The membrane rupture and release sequencing module performs a short-term vacuum reduction and then vacuum restoration disturbance processing on the dehydration tank in the initial stage of dehydration. It collects the membrane rupture hole recovery image, bubble cracking sound and exhaust humidity recovery status of the oil surface during the disturbance processing, and determines the membrane rupture and release sequence of the bound water in the film based on the membrane rupture hole recovery image, bubble cracking sound and exhaust humidity recovery status. The collaborative processing module maps the film-breaking release sequence to the film enrichment area and the condensation reflux area, generating a delayed dehydration area for sesame oil. This controls the stirring and heating methods, so that the stirring first pushes the oil in the delayed dehydration area to the shallow oil surface, then preheats and keeps the condensation reflux area warm, and then intermittently breaks down and dehydrates the shallow oil surface. The dehydration endpoint determination module repeatedly performs short-term vacuum disturbance processing and compares the recovered images of the membrane rupture holes, the sound of bubble bursting, and the recovery status of exhaust humidity after repeated processing with the previous processing results. When the comparison results show that the membrane rupture holes no longer recover with delay, the sound of bubble bursting no longer appears in a concentrated manner, and the exhaust humidity has not increased, the sesame oil is determined to have completed dehydration.

[0016] The technical effects and advantages provided by the present invention in the above technical solution are as follows: This invention differs from existing technologies that rely solely on oil temperature, vacuum level, dehydration time, or final moisture content to determine dehydration completion. It first distinguishes between free water, particulate-entrained water, and membrane-bound water by analyzing pre-processing information, sedimentation stratification information, and primary filtration residue information. Then, it correlates the location of membrane-bound water with temperature changes at the tank lid observation window, the root of the feed pipe, and the area around the agitator shaft seal to determine the membrane enrichment area and condensation reflux area. This allows for direct location of the actual area of ​​subsequent back-wetting during the dehydration process, preventing condensate from re-entering the water-containing membrane and being missed during routine sampling.

[0017] This invention further differs from conventional continuous vacuum dehydration by incorporating a disturbance process in the initial stage of dehydration: a brief vacuum reduction followed by vacuum restoration. Simultaneously, images of membrane rupture recovery, bubble cracking sounds, and the rise in exhaust humidity are captured. Based on this, the sequence of membrane-bound water release is determined, and a delayed dehydration zone is generated. This zone is first pushed to the shallow oil surface, then preheated in the condensation and reflux zone, followed by intermittent membrane rupture and dehydration. This process allows water encapsulated by the membrane and susceptible to condensation and reflux to be released and discharged before filling, directly reducing the risk of needle-like water lines at the bottle bottom, flocculent turbidity, and a rebound in water content after settling. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a flowchart of a dehydration control method for sesame oil production according to the present invention.

[0020] Figure 2 This is a flowchart of a dehydration control system module for sesame oil production according to the present invention.

[0021] Figure 3 This is a flowchart of the vacuum disturbance recovery method of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1, please refer to Figure 1 and Figure 3 As shown in this embodiment, a dehydration control method for sesame oil production includes: Obtain information on the pre-processing, sedimentation and stratification, and primary filtration residues of the sesame oil to be dehydrated, and determine the location of free water, particulate-entrained water, and membrane-bound water in the sesame oil.

[0024] In one embodiment, before the dehydrated sesame oil enters the dehydration tank, the production batch record corresponding to that batch of sesame oil is retrieved. This production batch record includes at least the draining time after washing the sesame raw materials, the discharge temperature after roasting, the pressing or water extraction method, the number of skimming operations, the pumping time, and the oil temperature upon entering the settling tank. Because different preceding oil processing conditions affect the form of water in sesame oil, for example, if the skimming time after water extraction is insufficient, sesame slurry easily remains as small droplets at the bottom of the oil; if the cooling time after roasting is short, the surface gel of the sesame powder softens, easily encapsulating water and suspending it with the oil; and when the pump delivers at high speed, free water is easily dispersed and adheres to the fine sesame particles. Therefore, in this embodiment, the moisture content of a single sample is not directly used as the basis for dehydration; instead, the possible forms of water in the batch of sesame oil are determined based on the aforementioned preceding oil processing information.

[0025] Subsequently, sesame oil samples were collected in the settling tank in stratified layers. Specifically, small amounts of oil were obtained from the upper oil surface area, the middle suspended area, the lower near-water foot area, and the edge area near the tank wall. Layered images were simultaneously acquired from the transparent observation section or sampling tube of the settling tank. When identifying the layered images, the focus was on identifying whether there were continuous bright lines or a water foot layer at the bottom of the oil body, whether there were flocculent dark bands in the middle of the oil body, and whether there were discontinuous oil films adhering to the oil surface and near the tank wall. If an oil sample taken from the lower water-foot area forms a continuous water droplet or water line at the bottom of the container after standing, then the lower water-foot area is identified as the main location of free water. If an oil sample taken from the middle suspension area does not form a clear water line after standing, but small water droplets precipitate after slight centrifugation or short-term heating, then the corresponding middle suspension area is identified as a possible location of particulate-entrained water. If an oil sample taken from the oil surface area or near the tank wall appears as a stringy, film-like, or adhered to the sampler surface, and no obvious water droplets precipitate after short-term standing, then the corresponding area is preliminarily identified as a possible location of film-bound water.

[0026] Collect the trapped material on the filter cloth or filter element at the initial oil inlet section, stabilization filtration section, and final filtration section of the primary filtration equipment, and record the distribution of the trapped material on the filter surface. Spread the trapped material on a clean transparent plate and observe its color, particle aggregation degree, and whether there is a glossy film layer on the surface; at the same time, observe the trapped material under low-temperature slow heating or depressurization to determine the order of water release. If the trapped material contains a lot of sesame powder and small water droplets are squeezed out immediately after pressure, it is considered that there is particulate water entrained in the corresponding oil area; if the trapped material is in sheet form and does not release water immediately under pressure, but bubbles, breaks the film, and releases water mist after heating or depressurization, it is considered that there is film-bound water in the corresponding oil area. Furthermore, correlate the source time of the trapped material on the filter surface with the oil discharge process of the settling tank to determine whether this type of trapped material comes from the upper layer oil, middle layer oil, or lower layer oil, thereby correcting the aforementioned water location judgment.

[0027] Finally, the information on the preceding oil processing, sedimentation stratification, and initial filtration residue is correlated. If a region simultaneously meets the conditions of a continuous waterline at the bottom of the sedimentation, direct stratification after sampling, and significant water content in the initial filtration residue, then that region is marked as the location of free water. If a region corresponds to the turbid zone in the middle of the sedimentation, concentrated filter particles, and water droplets released after pressure, then that region is marked as the location of entrained water. If a region corresponds to oil surface film, tank wall adhesion, concentrated flaky colloids on the filter surface, and water released only after heating or depressurization, then that region is marked as the location of film-bound water. These locations are recorded in the corresponding spatial areas after the dehydration tank is fed, including the lower oil body area, the middle oil body suspension area, the oil surface edge area, the oil inlet impact area, and the tank wall adhesion area. This forms the initial water distribution record of the sesame oil to be dehydrated, providing a basis for subsequently determining the film enrichment area and the condensation reflux area.

[0028] Based on the location of water trapped in the film, and combined with the temperature changes at the observation window of the tank lid, the root of the feed pipe, and the area around the seal of the stirring shaft, the film enrichment area and the condensation reflux area during the sesame oil dehydration process can be determined.

[0029] In one embodiment, the location of the water-binding membrane is mapped to the edge area of ​​the oil surface and the adhesion area of ​​the tank wall after the dehydration tank is fed, and this area is used as the tracking area.

[0030] Specifically, before the sesame oil to be dehydrated enters the dehydration tank from the settling tank, the source of the bound water is recorded based on the previously determined location of the film, indicating whether it originates from oil surface film, tank wall adhesion, or flaky gum on the filter surface. After feeding, the projection of the root of the feed pipe of the dehydration tank onto the inner wall of the tank is used as the starting reference position. Observation positions are divided along the circumference of the oil surface, and the oil surface edge that first contacts the tank wall during feeding, the tank wall adhesion point where an oil film tail forms after the feeding impact, and the oil surface position corresponding to the aforementioned source of bound water are identified as the areas to be tracked.

[0031] It should be noted that the area to be tracked is not limited to a fixed area, but is based on the continuous boundary of the oil film corresponding to the water bound by the gel film. This boundary is confirmed by the reflective strip on the oil surface, the oil lines hanging on the tank wall, and the residue from the sampler. The reason for this setting is that the water bound by the gel film in sesame oil does not move uniformly with the oil body, but preferentially stays at the edge of the oil surface and the adhesion points on the tank wall. Using these areas as the area to be tracked can avoid missing the location of water release in the later stages by judging solely based on the overall moisture content.

[0032] During the initial stage of dehydration and heating, maintain low-speed stirring, allowing the area to be tracked to pass sequentially through the observation window of the tank cover, the root of the feed pipe, and below the seal of the stirring shaft. Record the temperature decrease, stagnation, and rise at these locations. Specifically, the initial stage of dehydration and heating refers to the period before the oil temperature rises from the feed temperature to the point where continuous steam is generated. During this stage, strong boiling has not yet occurred, and the oil surface morphology can be continuously observed. The stirring speed is selected as 20% to 30% of the normal dehydration stirring speed of the dehydration tank. This range is determined through empty tank water tests and sesame oil carrying tests: below 20%, the area to be tracked cannot pass through each observation point in a circular path; above 30%, the oil surface film is broken up, and the original aggregated form of the water bound by the film cannot be maintained.

[0033] During recording, adhesive temperature measuring points are set at the edge of the tank cover observation window, the outer side of the feed pipe root, and the periphery of the agitator shaft seal. These measuring points are attached to the outer surface of the metal or glass that comes into contact with the water vapor inside the tank and are recorded synchronously with the oil level image. A temperature decrease refers to a drop in temperature at the monitored area relative to the previous recording time after the area passes below it; a temperature stagnation refers to the area not rising with the overall temperature increase inside the tank in the subsequent two recording times; a temperature rebound refers to the area subsequently returning to the same direction of temperature change as the exhaust steam temperature inside the tank.

[0034] The above recording method is used to distinguish the effects of heat absorption, moisture release, and water vapor adhesion when water is bound by the film from the thermal disturbance caused by the passage of ordinary oil.

[0035] Areas where temperature stagnation persists after passing through the target area, and where a film continues to form on the corresponding oil surface, are identified as areas rich in gel-like film. Specifically, after the target area passes the observation window of the tank lid, the root of the feed pipe, or below the seal of the stirring shaft, the temperature change record of the corresponding location is read, and the presence of a film continuing on the oil surface below is simultaneously checked. Film continuity refers to the oil surface reflective band remaining continuous along its original circumferential direction after stirring, and not being completely severed by the main oil flow in two adjacent image records; simultaneously, after the sampling rod lightly touches the oil surface at this location, a continuous oil film forms on the sampling rod surface rather than dispersed oil droplets. Only when both temperature stagnation and film continuity occur simultaneously is the target area marked as a region rich in gel-like film; when there is only temperature stagnation without film continuity, it is judged as poor local heat dissipation; when there is only film continuity without temperature stagnation, it is judged as a normal viscous oil film. This judgment logic can separate areas rich in gel-like film with the ability to release bound water from the wall-hanging phenomenon caused by the high viscosity of sesame oil itself.

[0036] The corresponding oil surface area located above the film enrichment area, and whose temperature does not rise synchronously with the decrease in exhaust humidity after the film enrichment area, is defined as the condensation reflux area.

[0037] After identifying the film enrichment area, continue stirring under the same conditions and record the temperature at the observation window of the tank cover, the root of the feed pipe, or the area around the agitator shaft seal above the film enrichment area, while simultaneously recording the changes in exhaust humidity. When the exhaust humidity begins to decrease, the temperature of the normally receiving steam section should rise as the moisture content decreases; if a certain upper section remains stagnant after the temperature drops, and the area directly below that section is the identified film enrichment area, then the oil surface area directly below that section is identified as the condensation reflux area.

[0038] It should be noted that the synchronous recovery here is determined by the correspondence between the direction of temperature change and the direction of exhaust humidity change within the same recording period, rather than using a single fixed temperature value. This is because different batches of sesame oil have different feed temperatures, tank insulation conditions, and ambient room temperatures, and a fixed temperature value can easily lead to misjudgment. By superimposing and confirming the locations of the "film enrichment area" and the "temperature not synchronously recovering" areas, it is possible to determine the areas where condensate actually falls back and re-enters the film-bound water, providing a locational basis for subsequent stirring methods, heating methods, and intermittent film breaking and dehydration.

[0039] In the initial stage of dehydration, the dehydration tank is subjected to a short-term vacuum reduction followed by a vacuum restoration. During the disturbance process, images of the ruptured membrane holes on the oil surface, sounds of bubble bursting, and the recovery status of exhaust humidity are collected. The sequence of membrane rupture and release of bound water is determined based on the images of the ruptured membrane holes, sounds of bubble bursting, and the recovery status of exhaust humidity.

[0040] In one possible implementation, the disturbance treatment of briefly reducing and then restoring the vacuum of the dehydration tank in the initial stage of dehydration, and the acquisition of images of the recovery of film rupture holes on the oil surface, bubbles cracking sounds, and the state of the recovery of exhaust humidity during the disturbance treatment process, specifically includes the following process.

[0041] The initial dehydration stage refers to the period after the sesame oil enters the dehydration tank, when the oil temperature begins to rise but has not yet formed continuous boiling. During this stage, the oil surface remains observable, and the bound water in the gel film has not been completely destroyed, making it suitable for exposing its film-breaking and water-releasing characteristics through vacuum disturbance. Before the disturbance treatment, the dehydration tank is maintained under normal vacuum conditions, and low-speed stirring is kept to ensure that the aforementioned gel film enrichment area and condensation reflux area pass through the observation position sequentially. After the exhaust humidity changes from an initial rise to a gradual decrease, a short-term vacuum reduction treatment is performed.

[0042] The short-term vacuum reduction refers to briefly reducing the vacuum pump's pumping speed or briefly opening the dehydration tank's air supply valve without stopping heating and stirring, causing the absolute pressure inside the tank to increase and thus lower the vacuum level. Subsequently, the air supply valve is closed and the vacuum pump's pumping speed is restored, returning the dehydration tank to its pre-disturbance vacuum state. The vacuum reduction is defined as the oil surface only producing localized bubbling without the entire tank churning. In actual production, this reduction can be determined by observing the oil surface during the first dehydration of similar batches of sesame oil: when only pinhole-like bulges, localized film rupture, and small bubble breakage appear in the areas rich in the gum film, while no continuous large bubbles appear in the middle of the oil, this is considered the acceptable vacuum reduction level for that batch. This selection method ensures that the disturbance effect is concentrated on the water bound in the gum film, rather than simultaneously and strongly carrying out free water and particulate-entrained water, avoiding subsequent misjudgment.

[0043] As the vacuum level begins to decrease, continuous image acquisition is performed on the oil surface. The image acquisition locations correspond to the aforementioned film enrichment area and condensation reflux area, focusing on recording the entire process of the oil film from bulging, opening, edge contraction, and re-closure. The recovered images of the film rupture holes include the location of the rupture hole, the edge morphology of the rupture hole, the closure path of the rupture hole, and whether there are any bright spots remaining after closure. If the rupture hole appears in the film enrichment area and the edge is sticky and stringy, and the closure is delayed after vacuum recovery, it indicates that there is bound water in the film that has not been completely released; if the rupture hole closes quickly and there are no bright spots remaining, it indicates that the oil film at this location is mainly a normal oil film rather than a water-containing film. By acquiring the recovered images of the film rupture holes, the location and time basis required for subsequent determination of the film release sequence can be obtained.

[0044] Simultaneously with acquiring images of the recovered pores, bubble bursting sounds were also collected. The sound acquisition point was positioned on the outside of the dehydration tank lid, near the observation window, to receive the sound transmitted through the tank as small bubbles on the oil surface burst. Instead of using ordinary stirring or friction sounds as the basis for judgment, short bursting sounds were recorded from the start of vacuum reduction until vacuum recovery. Specifically, the sound of stable stirring before the start of disturbance processing was used as background sound; during disturbance processing, only bubble bursting sounds significantly higher than the background sound and corresponding to the time of pore appearance in the image were recorded. If the bubble bursting sounds concentrated in the time period when the film-rich area passed the observation position and corresponded to the delayed recovery of the pores, it indicated that the bubble bursting sounds came from the release of bound water from the film. If the sounds appeared continuously and uniformly and did not correspond to the location of the oil surface pores, they were judged as ordinary venting or stirring disturbance sounds and were not used as a basis for judging bound water.

[0045] Simultaneously, exhaust humidity changes were collected on the exhaust pipe of the dehydration tank. The exhaust humidity recovery state refers to the state where, after a short-term vacuum reduction, the water bound to the membrane ruptures due to pressure disturbance, causing the exhaust humidity to rise again from its original level or decrease, and then gradually decrease after vacuum recovery. During data collection, the exhaust humidity change before the start of the disturbance treatment was used as the baseline, and the exhaust humidity changes during vacuum reduction and after vacuum recovery were continuously recorded. If the exhaust humidity recovery time corresponds to the time of membrane rupture and the time of bubble bursting sound, the exhaust humidity recovery state is determined to be caused by the release of water bound to the membrane. This correspondence can rule out humidity changes caused by simple gas replenishment, residual moisture in the pipeline, or temperature fluctuations.

[0046] After one disturbance treatment, the corresponding images of membrane rupture recovery, bubble cracking sounds, and exhaust humidity recovery status are obtained and recorded in chronological order. Specific records include: the start time of vacuum reduction, the region where the membrane rupture first appears, the region where the membrane rupture has closed, the time period during which the bubble cracking sounds are concentrated, and the time periods during which the exhaust humidity begins to rise and falls. By correlating these records with the locations of the aforementioned membrane enrichment region and condensation reflux region, the sequence of membrane rupture and release of bound water can be determined, providing a basis for subsequently generating a delayed dehydration region and adjusting the stirring and heating methods.

[0047] In one embodiment, determining the sequence of membrane rupture and release of bound water based on the recovered image of the membrane rupture hole, the sound of bubble bursting, and the recovery status of exhaust humidity specifically includes the following:

[0048] Based on the sequence of time after the short-term vacuum reduction begins, the positions of the first appearance of the membrane rupture hole, the adhesion and contraction of the hole edge, and the completion of the closure of the membrane rupture hole in the recovered image are sorted to obtain the initial membrane rupture position sequence.

[0049] The moment the short-term vacuum reduction begins is taken as the starting moment of the same perturbation process, and the oil surface images of the film-rich area and the condensation reflux area are continuously recorded. During recording, the moment when the oil surface changes from a complete reflective band to a pinhole-like dark spot or a bright edge opening is recorded as the first appearance of the film rupture hole; the process when the edge of the film rupture hole is stretched towards the center of the hole, forming a filamentous oil film at the edge, and does not immediately close is recorded as edge adhesion and contraction; the moment when the edge of the film rupture hole completely closes and reforms into a continuous reflective band is recorded as the completion of film rupture hole closure. Each film rupture hole corresponds to its location in the oil surface area, and the oil surface area location is recorded sequentially along the circumference of the aforementioned tracked area. In the case where multiple film rupture holes appear at the same location in one perturbation process, the earliest appearing film rupture hole is taken as the film rupture starting point at that location, and the last closed film rupture hole is taken as the closure ending point at that location, thereby avoiding multiple holes within the same film sheet being misjudged as multiple release locations.

[0050] The initial film rupture position sequence is formed by arranging the film rupture starting points at each location. This initial film rupture position sequence only reflects the order of film rupture on the oil surface and is not directly used as the release order of water bound by the film.

[0051] The bubble bursting sounds corresponding to each position in the initial membrane rupture position sequence are matched, and the positions where the bubble bursting sounds are concentrated and synchronized with the adhesion and contraction of the membrane rupture pores are marked as effective water release positions.

[0052] For each initial membrane rupture location, a sound recording segment was captured from the first appearance of the rupture hole to the completion of its closure, and compared with the background sound recording segment under low-speed stirring before the start of the disturbance treatment. The "concentrated bubble bursting sound" means that the short bursting sound appears continuously only within the sound recording segment at that location, and does not appear discontinuously in adjacent recording segments before membrane rupture or after membrane closure. The "synchronization with rupture hole adhesion and contraction" means that the time of the short bursting sound falls within the process of adhesion and contraction at the hole edge, rather than within the time after the oil surface is not open or the rupture hole has closed. This judgment is used because when water bound to the film is released during membrane rupture, small bubbles will emerge from below the film and burst, and ordinary stirring friction sound will not maintain the same time relationship as the adhesion and contraction at the hole edge. Locations that satisfy the above sound-image correspondence are marked as effective water release locations; initial membrane rupture locations that do not satisfy this are retained as ordinary membrane rupture locations and are not included in the initial release location judgment.

[0053] The time corresponding to the effective water release position is compared with the state of exhaust steam humidity recovery. The position that is located before the exhaust steam humidity begins to recover and causes the exhaust steam humidity to continue to recover is determined as the first release position.

[0054] The exhaust humidity records are time-aligned according to the same starting time. First, the direction of change in exhaust humidity before disturbance processing is read, and then the starting time when the exhaust humidity changes from stable or decreasing to increasing after the vacuum is reduced is read. The exhaust humidity begins to rise when two consecutive sampling points are higher than the previous sampling point. It should be noted that two consecutive sampling points are selected to eliminate single-point fluctuations caused by the instant the air supply valve opens and residual water vapor in the pipeline, while not delaying until multiple effective water release points have occurred, thus ensuring that the sequential release relationship can be distinguished.

[0055] For each effective water release location, if the end of the adhesion and shrinkage at the hole edge is earlier than the start of the rise in exhaust humidity, and the exhaust humidity after that location maintains the above-mentioned continuous rising state, then that effective water release location is determined as the first release location.

[0056] If multiple effective water release locations all occur before the exhaust humidity begins to rise, the location closest to the start of the exhaust humidity rise and where the bubble bursting sound recording segment completely falls into the hole edge adhesion and shrinkage process is selected as the first release location, and the remaining locations are selected as the subsequent effective water release locations.

[0057] The sequence of membrane rupture and release of bound water is determined based on the first release location, the subsequent effective water release location, and the location that does not cause a rise in exhaust humidity.

[0058] The first release location is placed at the beginning of the film rupture release sequence. Effective water release locations occurring after the first release location, still exhibiting concentrated bubble bursting sounds and synchronous pore edge adhesion and contraction, are arranged sequentially according to the start time of their pore edge adhesion and contraction. Locations with rupture holes but no corresponding increase in exhaust humidity are placed last and marked as locations that did not cause an increase in exhaust humidity. This film rupture release sequence simultaneously incorporates the opening and closing relationship in the image, the water release confirmation relationship in sound, and the water discharge relationship in exhaust humidity, avoiding the misinterpretation of ordinary oil film rupture as the release of bound water from the film solely based on the appearance time of the rupture hole. This film rupture release sequence is then correlated with the film enrichment region and the condensation reflux region to determine the hysteretic dehydration region.

[0059] The sequence of membrane rupture release is correlated with the membrane enrichment area and the condensation reflux area to generate a delayed dehydration area for sesame oil. By controlling the stirring and heating methods, the stirring first pushes the oil in the delayed dehydration area to the shallow oil surface, then the condensation reflux area is preheated and kept warm, and then the shallow oil surface is intermittently dehydrated by membrane rupture.

[0060] In one possible implementation, firstly, the release positions in the aforementioned film rupture release sequence are spatially mapped. Taking the projection position of the feed pipe root on the inner wall of the dehydration tank as the starting reference position, along the oil surface movement direction during the aforementioned low-speed stirring, the first release position, the subsequent effective water release position, and the position that did not cause a rise in exhaust humidity in the film rupture release sequence are respectively mapped to the already determined film enrichment area and condensation reflux area.

[0061] Correspondingly, the oil surface area where the rupture hole first appears is the primary location, and the oil surface area to which the rupture hole moves after closure is the final location. When the primary location coincides with the film-enriched area, and there is a defined condensation reflux area above the primary location, this location is recorded as the location to be judged for hysteresis. If a release location only coincides with the film-enriched area, but there is no condensation reflux area above it, it indicates that the film-bound water at this location can be discharged with normal steam exhaust and is not directly considered as a hysteresis dehydration area. If a release location is only located below the condensation reflux area, but does not belong to the film-enriched area, it indicates that this location is mainly affected by condensate dripping and is insufficient to indicate the presence of downstream retention of film-encapsulated water.

[0062] The delayed dehydration region is generated based on the order of the delayed hysteresis judgment positions in the membrane rupture and release sequence. Specifically, the effective water release positions that occur after the earlier release positions, the positions where the pore edge adhesion and shrinkage reappears in the next short-term vacuum disturbance treatment, and the positions where membrane rupture holes exist but do not cause a rebound in exhaust steam humidity are considered as the constituent positions of the delayed dehydration region.

[0063] The aforementioned locations share a common characteristic: the presence of the film is visible during rupture, but the released moisture fails to enter the exhaust channel in time, or is affected by condensation reflux and remains again at the oil surface edge. The boundary of the delayed dehydration region is based on the continuous boundary of the attached film in adjacent image records, and is recorded together with its corresponding attachment point on the tank wall, the oil surface edge, and the condensation reflux point above, to avoid mistaking ordinary oil surface ripples for delayed dehydration regions.

[0064] After generating the delayed dehydration zone, the stirring method is first controlled to push the oil within the delayed dehydration zone to the shallow oil surface layer. The shallow oil surface layer refers to the surface oil located below the reflective band on the oil surface, capable of forming film-breaking pores directly under short-term vacuum disturbance. During pushing, the aforementioned low-speed stirring is maintained initially, allowing the delayed dehydration zone to move along the oil surface edge to the observation position. Once the delayed dehydration zone has passed the observation position, the stirring direction is changed, causing the oil containing the adhesive film adhering to the tank wall to detach from the tank wall and move towards the inner side of the oil surface. Subsequently, the original low-speed stirring direction is restored, allowing this portion of the oil to pass through the observation position again. This stirring process of first reversing the wall detachment and then moving forward allows the water bound by the adhesive film originally adhering to the tank wall and the oil surface edge to enter the film-breaking shallow oil surface layer, rather than continuously remaining in the dead corners of the tank wall.

[0065] Before the delayed dehydration zone enters the shallow oil layer, the corresponding condensation and reflux zone above it is preheated and insulated. Specifically, the observation window of the tank cover, the root of the feed pipe, or the periphery of the agitator shaft seal above the film-enriched area is locally heated or externally insulated, and the temperature changes at this location are continuously recorded. The termination of preheating and insulation is not based on a fixed temperature value, but rather on the temperature at this location rising again as the exhaust humidity decreases within two consecutive recording cycles. Using two consecutive recording cycles is to eliminate instantaneous temperature fluctuations caused by the oil surface passing through, and to make a judgment before condensation continues to form. Through this treatment, water vapor condensation in the condensation and reflux zone can be reduced first, allowing the water released after subsequent film rupture to enter the exhaust channel instead of dripping back into the film-enriched area.

[0066] Finally, intermittent film-breaking dehydration is performed on the stagnant dehydration zone that has entered the shallow oil layer. After confirming that the condensation reflux zone has completed preheating and insulation, the dehydration tank is subjected to the aforementioned short-term vacuum reduction and then vacuum restoration disturbance treatment, which causes the water bound by the film in the shallow oil layer to form film-breaking pores and release moisture; after the film-breaking pores have closed, the bubble cracking sound has stopped appearing intensively, and the exhaust humidity has recovered and decreased, the next disturbance treatment is performed.

[0067] Understandably, the purpose of intermittent operation is to ensure that the water released each time the membrane breaks has time to drain, preventing continuous disturbance from causing the oil surface to churn and re-encapsulate the water. When, after repeated disturbance, the delayed dehydration area no longer exhibits edge adhesion and shrinkage, and the corresponding exhaust humidity no longer rises, the delayed dehydration area is considered to have completed dehydration treatment.

[0068] Repeat the short-term vacuum disturbance process, and compare the recovered images of the membrane rupture holes, the sound of bubble bursting, and the recovery status of exhaust humidity after the repeated processing with the results of the previous processing; when the comparison results show that the membrane rupture holes no longer recover with delay, the sound of bubble bursting no longer appears in a concentrated manner, and the exhaust humidity does not rise, it is determined that the sesame oil has completed dehydration.

[0069] In one embodiment, the repeated short-term vacuum disturbance processing, and the recovery images of the ruptured membrane holes, the sound of bubble bursting, and the recovery status of exhaust humidity after repeated processing are compared with the previous processing results, specifically including the following:

[0070] The location where the ruptured membrane hole was closed in the previous processing result is used as the starting point for the next disturbance. After re-entering the shallow oil layer at this location, the short-term vacuum disturbance process is repeated.

[0071] After the previous short-term vacuum disturbance ends, the location of the last closed membrane rupture point in the sluggish dehydration region is recorded as the tracking starting point. This location typically corresponds to a position where the release of bound water from the film is slower. Continue the aforementioned low-speed stirring, allowing this tracking starting point to move with the oil surface. When the tracking starting point is again located below the reflective band on the oil surface in the image, and the oil film boundary can be observed, it is considered to have re-entered the shallow oil layer. At this point, another short-term vacuum reduction and subsequent vacuum recovery disturbance is performed.

[0072] It should be noted that the purpose of this setting is to ensure that the same delayed dehydration area is disturbed again under similar oil surface conditions, so as to avoid mistaking the new ordinary oil film as the residual water bound by the previous film due to the change of observation position.

[0073] The locations of the first appearance of the membrane rupture hole, the adhesion and shrinkage of the hole edge, and the completion of the closure of the membrane rupture hole during the re-disturbance are collected and compared with the corresponding locations in the previous processing results.

[0074] After the perturbation begins again, the starting point for recording is still the moment when the short-term vacuum reduction begins. The locations of the first appearance of the membrane rupture hole, the location of the hole edge adhesion and contraction, and the location where the membrane rupture hole closes are recorded respectively. The overlap comparison refers to matching the above three types of locations in the re-perturbation with the same type of locations in the previous treatment results according to the direction of oil surface movement: if the membrane rupture hole in the re-perturbation still appears within the boundary of the previous delayed dehydration area, and the hole edge adhesion and contraction still occurs near the location where the membrane rupture hole closed in the previous treatment, it is determined that there is still incompletely released film-bound water at that location; if the membrane rupture hole in the re-perturbation deviates from the boundary of the previous delayed dehydration area, and the hole edge no longer forms continuous stringy contraction, it is determined that the film-bound water in the previous delayed dehydration area has been significantly weakened.

[0075] In this embodiment, the boundary of the delayed dehydration area is based on the aforementioned continuous biofilm boundary, and a fixed area value is not used separately. This is because different batches of sesame oil have different viscosities and surface ripples. Using the continuous biofilm boundary as the positional basis can directly correspond to the actual adhesion range of the water bound by the biofilm.

[0076] The concentrated time period of bubble bursting sound during the re-disturbance is correlated with the process of adhesion and shrinkage at the edge of the hole, and compared sequentially with the concentrated time period of bubble bursting sound in the previous instance.

[0077] For each membrane rupture point during the re-disturbance, the sound record is taken from the start of the rupture point's adhesion and contraction to the completion of the rupture point's closure, and compared with the sound record from the previous time at the same location. A concentrated bursting sound refers to short, continuous bursting sounds occurring during the rupture process, but not continuously before the first appearance of the rupture point or after its closure. If the concentrated bursting sound period during the re-disturbance is later than the previous time, and still corresponds to the same delayed dehydration area, it indicates that the release of bound water from the membrane is hindered at that location. If the bursting sound changes from concentrated to dispersed during the re-disturbance, meaning the short bursting sounds no longer continuously fall within the same rupture process, it indicates that the amount of water that can be released from the membrane has decreased, and concentrated water release no longer occurs during membrane rupture. Using the correspondence between sound and rupture, rather than solely relying on sound volume, is to eliminate non-water-releasing sounds caused by stirring friction, air injection, and tank vibration.

[0078] The state of the exhaust humidity recovery during the second disturbance is continuously compared with the state of the previous exhaust humidity recovery. Based on whether the delayed closure of the membrane rupture hole disappears, whether the sound of bubble bursting is dispersed, and whether the exhaust humidity no longer recovers, it is determined whether the sluggish dehydration area has completed dehydration.

[0079] The exhaust humidity records during the re-disturbance were aligned with the rupture hole recovery images and bubble bursting sound records at the same starting time. Exhaust humidity recovery is defined as two consecutive recording points being higher than their respective preceding recording points during the disturbance process; selecting two consecutive recording points is to exclude single-point fluctuations caused by the instantaneous gas injection and residual moisture in the pipeline, and to ensure that the recovery does not lag after the delayed dehydration area has completely passed the observation position. No further delayed rupture hole recovery means that the closure of the rupture hole during the re-disturbance is no later than the next recording cycle after the end of the hole edge adhesion and contraction, and the oil surface reflective band recovers continuously after closure; this judgment is based on the image characteristics of delayed rupture hole closure when the previous film-bound water was present. Bubble bursting sounds no longer appear in concentrated bursts means that short bursting sounds no longer continuously fall within the same hole edge adhesion and contraction process. No exhaust humidity recovery means that the exhaust humidity did not show the aforementioned continuous increase within two consecutive recording cycles from the start of the disturbance to the completion of the rupture hole closure. When all three conditions are met, it is determined that the water bound to the membrane in the sluggish dehydration zone has been released and the sesame oil has been dehydrated. If any one condition is not met, the next short-term vacuum disturbance process will continue, with the previous location where the membrane rupture hole was closed as the new starting point.

[0080] Example 2: To verify the effectiveness of the sesame oil production dehydration control method described in this invention in addressing issues such as bound water in the film, condensation reflux, and subsequent moisture reabsorption, a comparative experiment was conducted in the same sesame oil production workshop. Sesame raw materials from the same origin were used, and the same washing, roasting, pressing, settling, and initial filtration processes were followed to obtain sesame oil to be dehydrated. Each batch of sesame oil to be dehydrated consisted of 300 kg, and all were processed using the same vacuum dehydration tank. The experimental environment was a low-temperature winter production scenario, with workshop ambient temperatures ranging from 8°C to 11°C. Under this environment, localized condensation was more likely to occur at the tank lid observation window, the root of the feed pipe, and the periphery of the stirring shaft seal, thus verifying the improvement effect of this invention on the problem of localized moisture reabsorption caused by condensation reflux.

[0081] Experimental examples 1, 2, and 3 were set up, all using the method described in this invention for dehydration control. Specifically, the positions of free water, entrained water, and bound water in the film were first determined based on the preceding oil preparation information, sedimentation and stratification information, and initial filtration residue information. Then, the positions of bound water in the film were mapped to the edge area of ​​the oil surface and the adhesion area of ​​the tank wall inside the dehydration tank. Combined with the temperature changes at the observation window of the tank cover, the root of the feed pipe, and the area around the seal of the stirring shaft, the film enrichment area and the condensation reflux area were determined. Subsequently, a short-term vacuum reduction and then vacuum restoration disturbance was performed in the initial stage of dehydration, and images of film rupture recovery, bubble cracking sounds, and exhaust humidity were collected. The system recovers from its previous state and determines the sequence of membrane rupture and release of bound water based on the correspondence among the three factors. Then, the sequence of membrane rupture and release is correlated with the membrane enrichment area and the condensation reflux area to generate a delayed dehydration area. In this area, the oil is first pushed to the shallow oil surface. The condensation reflux area is then preheated and kept warm, followed by intermittent membrane rupture and dehydration of the shallow oil surface. Finally, the short-term vacuum disturbance process is repeated, and the recovery images of the previous membrane rupture holes, the sound of bubble bursting, and the recovery status of exhaust humidity are used as comparison criteria to determine whether the delayed dehydration area has completed dehydration.

[0082] Comparative examples 1, 2, and 3 were set up simultaneously. The comparative examples adopted conventional dehydration methods, that is, the completion of dehydration was judged only by the oil temperature, vacuum degree, dehydration time and the moisture content of the final sample in the dehydration tank. The location of water bound in the film was not identified, the film enrichment area and the condensation reflux area were not determined, and short-term vacuum disturbance comparison was not performed.

[0083] During the experiment, samples of each batch of sesame oil were taken at the end of dehydration, after 24 hours of standing after filling, and after 7 days of standing to test the moisture content. The bottom of the filled bottles was also observed for needle-like water lines, flocculent turbidity, or oil stratification. 100 bottles from each batch were randomly selected for visual inspection. The moisture content was determined using the same method. All samples were taken from the mixed oil sample before filling and from the bottom of the filled bottles to minimize single-point sampling errors. Delayed recovery of the membrane rupture hole refers to the inability of the rupture hole to form a continuous reflective band in the next image recording cycle after vacuum recovery; concentrated bubble bursting sound refers to short bursting sounds falling continuously within the same hole edge adhesion and shrinkage process; and increased exhaust humidity refers to two consecutive recording points where the exhaust humidity is higher than the previous recording point after disturbance treatment. These judgment methods are all based on the correspondence between images, sounds, and humidity during the dehydration process, aiming to eliminate single misjudgments caused by stirring fluctuations, instantaneous gas replenishment, and residual moisture in the pipeline.

[0084] Table 1

[0085] As shown in Table 1, the difference in moisture content at the end of dehydration between the experimental examples and the comparative examples was not significant, indicating that the moisture content at the endpoint sampling point alone is insufficient to reflect the subsequent increase in moisture caused by bound water in the film and condensation reflux. Comparative Examples 1 to 3 all had low moisture contents at the end of dehydration, but the moisture content at the bottom of the bottles increased significantly after 24 hours of standing, and further increased after 7 days of standing, with numerous needle-like water lines and flocculent turbidity appearing. This indicates that while conventional dehydration can remove free water, it cannot adequately treat the bound water coated by the film and released later. In Experimental Examples 1 to 3, the moisture content at the bottom of the bottles changed only slightly after 24 hours and 7 days of standing, and the number of needle-like water lines and flocculent turbidity decreased significantly. This indicates that the present invention can identify areas of delayed dehydration during the dehydration process and, through preheating and intermittent film-breaking dehydration, allow the bound water in the film to be released and discharged before filling.

[0086] The key process characteristics of Experimental Example 2 and Comparative Example 2 in the later stage of dehydration were further recorded, and the results are shown in Table 2.

[0087] Table 2

[0088] As shown in Table 2, this invention does not merely reduce moisture content by extending dehydration time, but rather identifies whether bound water in the film is still being released within the delayed dehydration region by observing the time correspondence between the image recovery of the ruptured membrane pores, the sound of bubble bursting, and the recovery of exhaust humidity. In Experiment 2, during the first short-term vacuum disturbance treatment, pore edge adhesion and shrinkage, concentrated bubble bursting sounds, and a slight increase in exhaust humidity occurred, indicating that bound water in the film was released by disturbance. During the second disturbance, these phenomena weakened, indicating that the releaseable water in the delayed dehydration region decreased. During the third disturbance, the ruptured membrane pores no longer showed delayed recovery, the bubble bursting sounds were no longer concentrated, and the exhaust humidity did not increase, indicating that the bound water in the delayed dehydration region had been basically released. Comparative Example 2 did not undergo the above identification and treatment. Although the overall test results after dehydration were close to passing, localized film adhesion and bright spots still existed, and after filling and settling, water accumulation and turbidity appeared at the bottom of the bottle.

[0089] Table 3 shows the supplementary comparison results of Comparative Example 2, which involved extending the dehydration time separately on top of the conventional dehydration method.

[0090] Table 3

[0091] As shown in Table 3, while simply extending the conventional dehydration time can further reduce the moisture content at the end of dehydration, the moisture content at the bottom of the bottle after 7 days of standing is still significantly higher than in Example 2, and it easily has an adverse effect on the aroma of sesame oil. Example 2, by locating the delayed dehydration zone, preheating the reflux zone, and intermittently breaking down the film on the shallow oil surface, reduces the risk of moisture rebound and turbidity after standing with only a small amount of additional processing time. Therefore, the beneficial effect of this invention lies not in simply increasing the heating intensity or extending the dehydration time, but in providing an identifiable, traceable, and repeatable dehydration control process to address the localized delayed dehydration problem caused by both bound water in the film and reflux.

[0092] In summary, the present invention can achieve at least the following effects: First, it can distinguish between free water, water entrained in particles, and water bound to the film, avoiding misjudging the subsequent backflow of sesame oil as insufficient dehydration; Second, it can determine the condensation reflux area based on the temperature changes of the observation window on the can lid, the root of the feed pipe, and the area around the sealing of the stirring shaft, reducing the amount of condensate falling back into the film-rich area; Third, it can determine whether the release of water bound to the film is complete by using the image recovered from the rupture hole under short-term vacuum disturbance, the sound of bubble bursting, and the state of the return of exhaust humidity; Fourth, it can reduce the probability of needle-like water lines, flocculent turbidity, and increased water content at the bottom of the bottle after sesame oil filling, improving the dehydration stability of sesame oil and the consistency of the finished product appearance.

[0093] Example 3, please refer to Figure 2 As shown in this embodiment, a sesame oil production dehydration control system includes: The moisture state positioning module acquires the pre-processing information, sedimentation and stratification information, and primary filtration residue information of the sesame oil to be dehydrated, and determines the location of free water, particulate water, and membrane-bound water in the sesame oil. The film enrichment and condensation reflux identification module determines the film enrichment area and condensation reflux area during the sesame oil dehydration process based on the location of water bound in the film and the temperature changes at the observation window of the tank cover, the root of the feed short pipe, and the periphery of the stirring shaft seal. The membrane rupture and release sequencing module performs a short-term vacuum reduction and then vacuum restoration disturbance processing on the dehydration tank in the initial stage of dehydration. It collects the membrane rupture hole recovery image, bubble cracking sound and exhaust humidity recovery status of the oil surface during the disturbance processing, and determines the membrane rupture and release sequence of the bound water in the film based on the membrane rupture hole recovery image, bubble cracking sound and exhaust humidity recovery status. The collaborative processing module maps the film-breaking release sequence to the film enrichment area and the condensation reflux area, generating a delayed dehydration area for sesame oil. This controls the stirring and heating methods, so that the stirring first pushes the oil in the delayed dehydration area to the shallow oil surface, then preheats and keeps the condensation reflux area warm, and then intermittently breaks down and dehydrates the shallow oil surface. The dehydration endpoint determination module repeatedly performs short-term vacuum disturbance processing and compares the recovered images of the membrane rupture holes, the sound of bubble bursting, and the recovery status of exhaust humidity after repeated processing with the previous processing results. When the comparison results show that the membrane rupture holes no longer recover with delay, the sound of bubble bursting no longer appears in a concentrated manner, and the exhaust humidity has not increased, the sesame oil is determined to have completed dehydration.

[0094] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A method for controlling dehydration in sesame oil production, characterized in that, include: To obtain the pre-processing information, sedimentation and stratification information, and primary filtration residue information of the sesame oil to be dehydrated, the location of free water, particulate water, and membrane-bound water in the sesame oil is determined. Based on the location of water trapped in the film, and combined with the temperature changes at the observation window of the tank cover, the root of the feed pipe, and the area around the seal of the stirring shaft, the film enrichment area and the condensation reflux area during the sesame oil dehydration process are determined. In the initial stage of dehydration, the dehydration tank is subjected to a short-term vacuum reduction followed by a vacuum restoration. During the disturbance process, images of the broken film holes on the oil surface, sounds of bubble bursting, and the recovery status of exhaust humidity are collected. The sequence of the release of water bound by the film is determined based on the images of the broken film holes, sounds of bubble bursting, and the recovery status of exhaust humidity. The sequence of membrane rupture and release is correlated with the membrane enrichment area and the condensation reflux area to generate a sluggish dehydration area for sesame oil. The stirring and heating methods are controlled so that the stirring first pushes the oil in the sluggish dehydration area to the shallow oil surface, then the condensation reflux area is preheated and kept warm, and then the shallow oil surface is intermittently dehydrated by membrane rupture. Repeat the short-term vacuum disturbance process, and compare the recovered images of the membrane rupture holes, the sound of bubble bursting, and the recovery status of exhaust humidity after the repeated processing with the results of the previous processing; when the comparison results show that the membrane rupture holes no longer recover with delay, the sound of bubble bursting no longer appears in a concentrated manner, and the exhaust humidity does not rise, it is determined that the sesame oil has completed dehydration.

2. The method for controlling dehydration in sesame oil production according to claim 1, characterized in that, Determining the location of free water, water entrained in particles, and water bound in the sesame oil film includes the following steps: The oil temperature recorded in the production batch is correlated with the upper oil surface area, the middle suspended area, the lower near-water foot area, and the edge area near the tank wall in the settling tank. Based on the water line formation state after the oil samples in each region have been left to stand, the water droplet precipitation state after heating or centrifugation, and the filamentous film formation state of the oil samples on the sampler surface, candidate positions for free water, particle-entrained water, and film-bound water were obtained respectively.

3. The method for controlling dehydration in sesame oil production according to claim 1, characterized in that, The process of refining candidate locations for water trapped in the film includes the following steps: The primary filter residue that is sheet-like and does not immediately release water under pressure is identified as colloidal residue, and the filter surface position corresponding to the colloidal residue and the time period of entry into the primary filter are recorded. The time period is mapped to the oil outlet layer of the settling tank. When the oil outlet layer has oil surface film, tank wall adhesion or sampler string residue at the same time, the oil outlet layer is mapped to the oil surface edge area, oil inlet impact area or tank wall adhesion area after the dehydration tank feeds. The corresponding oil surface edge area, oil inlet impact area, or tank wall adhesion area are identified as the location of the water-binding film.

4. The method for controlling dehydration in sesame oil production according to claim 1, characterized in that, Determining the film enrichment region and the condensation reflux region includes the following steps: The location of the water bound by the adhesive film is mapped to the edge area of ​​the oil surface and the area of ​​adhesion to the tank wall after the feed is introduced into the dehydration tank, and the continuous boundary of the oil film corresponding to the water bound by the adhesive film is taken as the area to be tracked. During the initial stage of dehydration and heating, maintain low-speed stirring so that the area to be tracked passes sequentially below the observation window of the tank cover, the root of the feed short pipe, and the area around the sealing periphery of the stirring shaft, and simultaneously record the corresponding temperature decrease, temperature stagnation, and temperature rise. The area where the temperature remains stagnant after passing through the tracking area and the corresponding oil surface shows a continuous film formation is identified as the film enrichment area. The corresponding oil surface area below the film enrichment area, where the temperature decreases but does not rise synchronously with the decrease in exhaust humidity, is identified as the condensation reflux area.

5. The method for controlling dehydration in sesame oil production according to claim 1, characterized in that, Record the temperature decrease, temperature stagnation, and temperature recovery states, including the following steps: Attached temperature measuring points are set at the edge of the observation window on the tank cover, the outer side of the root of the feed pipe, and the periphery of the agitator shaft seal, and the temperature records of each attached temperature measuring point are matched with the oil level image records at the same recording time. When the area to be tracked passes below any attached temperature measuring point, the temperature decrease is recorded as the temperature of the attached temperature measuring point relative to the previous recording time. The temperature stagnation is recorded as the temperature does not rise with the overall temperature rise in the tank during the next two recording times. When the temperature change direction of the attached temperature measuring point returns to the same direction as the exhaust steam temperature change direction, it is recorded as a temperature rise, and the location where the temperature stagnation and film continuation occur simultaneously is used to eliminate the location of ordinary viscous oil film.

6. The method for controlling dehydration in sesame oil production according to claim 1, characterized in that, Disturbance handling after a short-term vacuum drop and subsequent vacuum restoration includes the following steps: After the exhaust humidity changes from an initial rise to a gradual rise, reduce the vacuum pump's pumping volume or open the air supply valve without stopping heating and stirring, so that the vacuum level in the dehydration tank is reduced to the point where pinhole-like bulges and local film ruptures only appear on the oil surface in the areas where the film is enriched. When no continuous large bubbles appear in the middle of the oil body, close the air supply valve and restore the vacuum pump's pumping volume to return the dehydration tank to the vacuum state before the disturbance. During the period from the start of vacuum reduction to the completion of vacuum recovery, images of the recovery of ruptured pores, bubbles, and the recovery status of exhaust humidity were continuously collected from the oil surface corresponding to the film enrichment area and the condensation reflux area.

7. The method for controlling dehydration in sesame oil production according to claim 1, characterized in that, Determining the sequence of membrane rupture and release of bound water includes the following steps: Based on the sequence of time after the short-term vacuum reduction begins, the positions of the first appearance of the membrane rupture hole, the adhesion and shrinkage of the hole edge, and the completion of the closure of the membrane rupture hole are ordered to obtain the initial membrane rupture position sequence; Match the bubble bursting sound corresponding to each position in the initial membrane rupture position sequence with the adhesion and shrinkage process at the pore edge, and mark the position where the bubble bursting sound is concentrated and synchronized with the adhesion and shrinkage at the pore edge as the effective water release position; The time of the effective water release location is compared with the state of exhaust steam humidity recovery. The location that is located before the exhaust steam humidity begins to rise and causes the exhaust steam humidity to continue to rise is determined as the first release location. The film rupture release sequence is determined according to the first release location, the subsequent effective water release location, and the location that does not cause the exhaust steam humidity to rise.

8. The method for controlling dehydration in sesame oil production according to claim 1, characterized in that, The delayed dehydration zone for producing sesame oil includes the following steps: The first release position, the subsequent effective water release position, and the position that did not cause a rise in exhaust humidity in the membrane release sequence are respectively mapped to the membrane enrichment area and the condensation reflux area. When the location where the membrane rupture hole first appears coincides with the area where the film is enriched, and there is a condensation reflux area above the location where the membrane rupture hole first appears, the location is recorded as the location to be judged for hysteresis. The effective water release location that occurs after the initial release location, the location where the hole edge still sticks and shrinks during the second disturbance, and the location where there are membrane rupture holes but no increase in exhaust humidity are considered as the components of the delayed dehydration zone.

9. The method for controlling dehydration in sesame oil production according to claim 8, characterized in that, Controlling the stirring and heating methods and determining when the sesame oil has finished dehydrating includes the following steps: First, maintain low-speed stirring to move the sluggish dehydration zone along the edge of the oil surface to the observation position, then change the stirring direction to make the oil containing the gum film attached to the tank wall detach from the tank wall and enter the shallow layer of the oil surface; Before the sluggish dehydration zone enters the shallow oil layer, the corresponding condensation reflux zone above it is preheated and kept warm until the temperature of the condensation reflux zone rises as the exhaust steam humidity decreases within two consecutive recording cycles. The sluggish dehydration zone in the shallow layer of the oil surface is subjected to short-term vacuum disturbance treatment again. The image of the broken membrane hole recovery, the sound of bubble cracking and the state of the return of exhaust humidity after repeated treatment are compared with the previous treatment results. When the broken membrane hole no longer recovers with delay, the sound of bubble cracking no longer appears in a concentrated manner and the exhaust humidity does not rise, it is determined that the sesame oil has completed dehydration.

10. A sesame oil production dehydration control system, used to implement the sesame oil production dehydration control method according to any one of claims 1-9, characterized in that, include: The moisture state positioning module acquires the pre-processing information, sedimentation and stratification information, and primary filtration residue information of the sesame oil to be dehydrated, and determines the location of free water, particulate water, and membrane-bound water in the sesame oil. The film enrichment and condensation reflux identification module determines the film enrichment area and condensation reflux area during the sesame oil dehydration process based on the location of water bound in the film and the temperature changes at the observation window of the tank cover, the root of the feed short pipe, and the periphery of the stirring shaft seal. The membrane rupture and release sequencing module performs a short-term vacuum reduction and then vacuum restoration disturbance processing on the dehydration tank in the initial stage of dehydration. It collects the membrane rupture hole recovery image, bubble cracking sound and exhaust humidity recovery status of the oil surface during the disturbance processing, and determines the membrane rupture and release sequence of the bound water in the film based on the membrane rupture hole recovery image, bubble cracking sound and exhaust humidity recovery status. The collaborative processing module maps the film-breaking release sequence to the film enrichment area and the condensation reflux area, generating a delayed dehydration area for sesame oil. This controls the stirring and heating methods, so that the stirring first pushes the oil in the delayed dehydration area to the shallow oil surface, then preheats and keeps the condensation reflux area warm, and then intermittently breaks down and dehydrates the shallow oil surface. The dehydration endpoint determination module repeatedly performs short-term vacuum disturbance processing and compares the recovered images of the membrane rupture holes, the sound of bubble bursting, and the recovery status of exhaust humidity after repeated processing with the previous processing results. When the comparison results show that the membrane rupture holes no longer recover with delay, the sound of bubble bursting no longer appears in a concentrated manner, and the exhaust humidity has not increased, the sesame oil is determined to have completed dehydration.

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