Method and device for identifying instability of xanthan gum solution membrane concentration start-up stage

Abstract

This application discloses a method and device for identifying instability during the start-up phase of xanthan gum liquid film concentration. The method includes: introducing the same batch of xanthan gum liquid into the main membrane path and the shadow membrane path; after the first loading of the main membrane path, switching the main membrane path to a zero-permeability or near-zero-permeability holding section, and maintaining continuous flow in both the main membrane path and the shadow membrane path within the zero-permeability or near-zero-permeability holding section; determining whether the shadow membrane path has returned to the batch baseline recovery range based on the response of the shadow membrane path within the zero-permeability or near-zero-permeability holding section; when the shadow membrane path returns to the batch baseline recovery range, performing a second loading of the main membrane path; when the main membrane path deteriorates during the second loading, switching the main membrane path to zero net permeability, obtaining the main membrane path response information, and loading the shadow membrane path based on the loading trajectory of the second loading, obtaining the shadow membrane path response information; and identifying the instability type of the xanthan gum liquid based on the main membrane path response information and the shadow membrane path response information.

Description

Technical Field

[0001] This application relates to the field of xanthan gum production technology, and in particular to a method and equipment for identifying instability during the start-up stage of xanthan gum liquid film concentration. Background Technology

[0002] Xanthan gum is a high-molecular-weight microbial polysaccharide, and its fermentation broth typically exhibits high viscosity and significant non-Newtonian rheological properties. In xanthan gum production, membrane concentration or ultrafiltration is often used to pre-concentrate the fermentation broth to reduce the load on subsequent separation and drying. Existing research indicates that xanthan gum systems tend to form high-resistance concentration polarization layers or gel layers during membrane separation, and the resistance of this interfacial layer varies with the system's association state, salt environment, and operating history, leading to decreased flux and increased transmembrane pressure.

[0003] Compared to some other polysaccharide systems, xanthan gum exhibits more structurally sensitive fouling and drag-increasing behavior in membrane filtration. Specifically, the molecular structure and interactions of xanthan gum significantly affect its membrane adhesion, gel layer formation, and specific filtration resistance, and its filtration behavior differs markedly from that of polysaccharides such as alginate. That is, in xanthan gum feed solutions, membrane drag increase does not always simply correspond to reversible polarization or irreversible fouling in the conventional sense, but may be simultaneously influenced by the overall flow recovery state of the feed solution, the local aggregation state of the interfacial layer, and past operating history.

[0004] However, current membrane process start-up control typically assesses membrane fouling levels, critical operating ranges, or operational stability using indicators such as flux changes in a single membrane path, transmembrane pressure changes, and recovery after loading and unloading. This makes it difficult to determine whether the deterioration upon reloading stems from incomplete overall recovery of the current circulating feed solution or from a localized lock-in effect left at the membrane interface due to previous net permeation history. Furthermore, when both the former and the latter can manifest as premature flux decline or accelerated pressure recovery, existing methods easily conflate these two different sources of instability, thus affecting the accuracy of start-up identification and subsequent operational decisions. Summary of the Invention

[0005] This application provides a method for identifying instability during the start-up phase of xanthan gum liquid film concentration, in order to solve the problem in the prior art that the identification of abnormalities during the start-up of xanthan gum liquid film concentration mainly relies on a single path response, making it difficult to stably distinguish instability signs from different sources, thus leading to inaccurate identification of instability types during the start-up phase of film concentration.

[0006] This application also provides an instability identification device for the start-up stage of xanthan gum liquid film concentration, an electronic device, and a computer-readable storage medium.

[0007] The embodiments of this application adopt the following technical solutions: In a first aspect, embodiments of this application provide a method for identifying instability during the start-up phase of xanthan gum liquid film concentration, including: The same batch of xanthan gum solution is introduced into the main membrane path and the shadow membrane path. The main membrane path is equipped with a working membrane unit, and the shadow membrane path is equipped with a shadow membrane unit. The shadow membrane unit and the working membrane unit use the same membrane material and the same flow channel structure. After the first loading of the main membrane path, the main membrane path is switched to the zero-permeability or near-zero-permeability holding section, and the main membrane path and the shadow membrane path are kept flowing continuously within the zero-permeability or near-zero-permeability holding section; Based on the response of the shadow film path within the zero or near-zero transmittance holding range, determine whether the shadow film path has returned to the batch baseline recovery range; Once the shadow membrane path returns to the batch baseline recovery range, a second loading is applied to the main membrane path; When the main membrane path deteriorates due to forward shift during the second loading, the main membrane path is switched to zero net permeability to obtain the main membrane path response information. Based on the loading trajectory of the second loading, the shadow membrane path is loaded to obtain the shadow membrane path response information. The instability type of xanthan gum solution is identified based on the main membrane path response information and the shadow membrane path response information.

[0008] Optionally, based on the response of the shadow film path within the zero or near-zero transmittance holding range, it can be determined whether the shadow film path has returned to the batch baseline recovery range, including: While maintaining zero permeability in the shadow membrane path, the initial pressure drop and initial circulation flow rate of the shadow membrane path were continuously collected in multiple sampling cycles to establish a batch baseline; During the zero or near-zero permeability maintenance phase, the pressure drop and circulation flow rate of the shadow membrane path are continuously collected; Whether the shadow membrane path has returned to the batch baseline recovery range is determined by whether the pressure drop and circulation flow rate of the shadow membrane path return to the allowable deviation range of the batch baseline in multiple consecutive sampling cycles.

[0009] Optionally, the main membrane path is switched to a zero-permeability or near-zero-permeability holding section, and the main membrane path and the shadow membrane path are kept continuously flowing within the zero-permeability or near-zero-permeability holding section, including: Reduce the net permeability of the main membrane path to zero or preset near-zero permeability range; After the net permeation of the main membrane path drops to zero or the preset near-zero permeation range, the main membrane path and the shadow membrane path are kept in continuous flow. During the zero or near-zero permeation maintenance phase, the main membrane path and the shadow membrane path are maintained in a continuous circulation state based on the same circulating feed solution.

[0010] Optionally, the main membrane path is switched to zero net permeability to obtain the main membrane path response information, and the shadow membrane path is loaded based on the loading trajectory of the second loading to obtain the shadow membrane path response information, including: When the main membrane path deteriorates due to forward shift, the main membrane path will be switched to zero net permeation. After the main membrane path is switched to zero net permeability, the shadow membrane path is loaded according to the loading trajectory of the second loading. When the main membrane path is switched to zero net permeation and the shadow membrane path is loaded according to the loading trajectory of the second loading, the main membrane path and the shadow membrane path are kept in the same circulating feed system. The response information of the main membrane path and the response information of the shadow membrane path are obtained according to the resistance drop of the main membrane path and the resistance increase of the shadow membrane path.

[0011] Optionally, based on the resistance drop of the main membrane path and the resistance increase of the shadow membrane path, the response information of the main membrane path and the response information of the shadow membrane path are obtained respectively, including: After the main membrane path is switched to zero net permeation, the transmembrane pressure difference and flux are continuously collected during multiple sampling cycles of the main membrane path; Based on the changes in transmembrane pressure difference and / or flux before and after the main membrane path is switched to zero net permeation, the magnitude of the resistance drop in the main membrane path is determined, and the main membrane path response information is obtained. While the shadow membrane path is being loaded according to the loading trajectory, the transmembrane pressure difference and flux of the shadow membrane path are continuously collected in multiple sampling cycles. Based on the changes in transmembrane pressure difference and / or flux of the shadow membrane path under the loading trajectory, the resistance increase of the shadow membrane path is determined, and the response information of the shadow membrane path is obtained.

[0012] Optionally, the instability type of xanthan gum solution can be identified based on the main membrane path response information and the shadow membrane path response information, including: Based on the response information of the main membrane circuit during the second loading, determine whether the main membrane circuit has deteriorated due to forward shift during the second loading; When the main membrane pathway does not show forward shift or deterioration during the second loading, it is identified as a reversible polarization state; or, If the main membrane path deteriorates during the second loading, and if the resistance drops after switching to zero net permeability, and the shadow membrane path does not reproduce the resistance increase response corresponding to the deterioration during loading according to the loading trajectory, then it is identified as an interface lock-in risk.

[0013] Optionally, the method further includes: If the main membrane path deteriorates during the second loading, and if the main membrane path remains in a high-resistance state after switching to zero net permeability, it is identified as an irreversible fouling risk. Alternatively, if the main membrane path deteriorates during the second loading, and the shadow membrane path reproduces the resistance increase response corresponding to the deterioration after loading according to the loading trajectory, it is identified as an irreversible fouling risk.

[0014] Secondly, embodiments of this application provide an instability identification device for the start-up stage of xanthan gum liquid film concentration, comprising an introduction module, a switching module, a judgment module, a loading module, a processing module, and an identification module, wherein: An inlet module is used to introduce the same batch of xanthan gum solution into the main membrane path and the shadow membrane path. The main membrane path is equipped with a working membrane unit, and the shadow membrane path is equipped with a shadow membrane unit. The shadow membrane unit and the working membrane unit use the same membrane material and the same flow channel structure. The switching module is used to switch the main membrane path to a zero-permeability or near-zero-permeability holding section after the first loading of the main membrane path, and to maintain continuous flow in the main membrane path and the shadow membrane path within the zero-permeability or near-zero-permeability holding section; The judgment module is used to determine whether the shadow film path has returned to the batch reference recovery range based on the response of the shadow film path in the zero or near-zero transmittance holding section. The loading module is used to perform a second loading on the main membrane path after the shadow membrane path returns to the batch baseline recovery range; The processing module is used to switch the main membrane path to zero net permeability when the main membrane path deteriorates during the second loading, obtain the main membrane path response information, and load the shadow membrane path based on the loading trajectory of the second loading to obtain the shadow membrane path response information. The identification module is used to identify the instability type of xanthan gum solution based on the main membrane path response information and the shadow membrane path response information.

[0015] Optional, a decision module, used for: While maintaining zero permeability in the shadow membrane path, the initial pressure drop and initial circulation flow rate of the shadow membrane path were continuously collected in multiple sampling cycles to establish a batch baseline; During the zero or near-zero permeability maintenance phase, the pressure drop and circulation flow rate of the shadow membrane path are continuously collected; Whether the shadow membrane path has returned to the batch baseline recovery range is determined by whether the pressure drop and circulation flow rate of the shadow membrane path return to the allowable deviation range of the batch baseline in multiple consecutive sampling cycles.

[0016] Optional, switch module, used for: Reduce the net permeability of the main membrane path to zero or preset near-zero permeability range; After the net permeation of the main membrane path drops to zero or the preset near-zero permeation range, the main membrane path and the shadow membrane path are kept in continuous flow. During the zero or near-zero permeation maintenance phase, the main membrane path and the shadow membrane path are maintained in a continuous circulation state based on the same circulating feed solution.

[0017] Optional processing modules include: The switching unit is used to switch the main membrane path to zero net permeation when the main membrane path deteriorates due to forward shift. The loading unit is used to load the shadow membrane path according to the loading trajectory of the second loading after the main membrane path is switched to zero net permeability; The processing unit is used to maintain the main membrane path and the shadow membrane path in the same circulating feed system when the main membrane path switches to zero net permeability and the shadow membrane path is loaded according to the loading trajectory of the second loading. It also obtains the response information of the main membrane path and the response information of the shadow membrane path according to the resistance drop of the main membrane path and the resistance increase of the shadow membrane path.

[0018] Optional, processing unit, used for: After the main membrane path is switched to zero net permeation, the transmembrane pressure difference and flux are continuously collected during multiple sampling cycles of the main membrane path; Based on the changes in transmembrane pressure difference and / or flux before and after the main membrane path is switched to zero net permeation, the magnitude of the resistance drop in the main membrane path is determined, and the main membrane path response information is obtained. While the shadow membrane path is being loaded according to the loading trajectory, the transmembrane pressure difference and flux of the shadow membrane path are continuously collected in multiple sampling cycles. Based on the changes in transmembrane pressure difference and / or flux of the shadow membrane path under the loading trajectory, the resistance increase of the shadow membrane path is determined, and the response information of the shadow membrane path is obtained.

[0019] Optional, the recognition module is used for: Based on the response information of the main membrane circuit during the second loading, determine whether the main membrane circuit has deteriorated due to forward shift during the second loading; When the main membrane pathway does not show forward shift or deterioration during the second loading, it is identified as a reversible polarization state; or, If the main membrane path deteriorates during the second loading, and if the resistance drops after switching to zero net permeability, and the shadow membrane path does not reproduce the resistance increase response corresponding to the deterioration during loading according to the loading trajectory, then it is identified as an interface lock-in risk.

[0020] Optionally, the recognition module is also used for: If the main membrane path deteriorates during the second loading, and if the main membrane path remains in a high-resistance state after switching to zero net permeability, it is identified as an irreversible fouling risk. Alternatively, if the main membrane path deteriorates during the second loading, and the shadow membrane path reproduces the resistance increase response corresponding to the deterioration after loading according to the loading trajectory, it is identified as an irreversible fouling risk.

[0021] Thirdly, embodiments of this application provide an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, it implements the steps of the instability identification method for the start-up stage of xanthan gum liquid film concentration as described above.

[0022] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the instability identification method for the start-up stage of xanthan gum liquid film concentration as described above.

[0023] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects: The method provided in this application involves simultaneously introducing the same batch of xanthan gum solution into the main membrane path and the shadow membrane path. After the first loading of the main membrane path, a zero-permeability or near-zero-permeability holding section is set. Whether the shadow membrane path returns to the batch baseline recovery range within this holding section is used as the starting condition for the second loading. When the main membrane path deteriorates due to forward movement during the second loading, the main membrane path is switched to zero net permeability, and the shadow membrane path is loaded based on the loading trajectory of the second loading to obtain the response information of the main membrane path and the response information of the shadow membrane path respectively. In this way, the abnormal response caused by insufficient overall recovery of the xanthan gum solution can be distinguished from the interface instability symptoms induced by the previous net permeability history during the membrane concentration start-up stage. This improves the accuracy of instability type identification and the reliability of identification during the membrane concentration start-up stage. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic diagram illustrating the implementation process of a method for identifying instability during the start-up phase of xanthan gum liquid film concentration, provided in an embodiment of this application. Figure 2 This application provides a schematic diagram of the specific structure of an instability identification device for the start-up stage of xanthan gum liquid film concentration. Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0027] To address the problem in existing technologies where the identification of anomalies during the start-up of xanthan gum liquid film concentration relies primarily on a single-path response, making it difficult to stably distinguish instability symptoms from different sources and thus leading to inaccurate identification of instability types during the film concentration start-up phase, this application provides a method for identifying instability during the start-up phase of xanthan gum liquid film concentration.

[0028] Specifically, the implementation flow of the method provided in this application embodiment is as follows: Figure 1 As shown, it includes the following steps: Step 102: The same batch of xanthan gum solution is introduced into the main membrane path and the shadow membrane path. The main membrane path is equipped with a working membrane unit, and the shadow membrane path is equipped with a shadow membrane unit. The shadow membrane unit and the working membrane unit use the same membrane material and the same flow channel structure.

[0029] The main membrane path refers to the membrane separation path that bears the actual net permeation load; the shadow membrane path refers to the membrane separation path that is set in parallel with the main membrane path and is used to provide isomorphic comparison.

[0030] In this embodiment, the working membrane unit is a membrane assembly disposed in the main membrane path and is used to generate actual permeation during the loading stage; the shadow membrane unit is a membrane assembly disposed in the shadow membrane path and is used to form a one-to-one correspondence with the working membrane unit.

[0031] In this context, the use of the same membrane material for both the shadow membrane unit and the working membrane unit means that the membranes use the same material system. For example, they may be membranes from the same batch or cut from the same master membrane, in order to minimize deviations caused by differences in membrane surface roughness, surface energy, hydrophilicity / hydrophobicity, and pore structure distribution.

[0032] Using the same flow channel structure means that the feed channel length, channel width, channel height, mesh type, membrane clamping method, and flow direction of the liquid in the channel are kept consistent for the working membrane unit and the shadow membrane unit, so that the two membrane paths form approximately the same wall shear environment and channel pressure drop at the same flow rate.

[0033] It should be noted that the reason why the shadow membrane unit and the working membrane unit are required to use the same membrane material and the same flow channel structure is because xanthan gum solution is a high-viscosity system with significant polysaccharide entanglement and sensitive interfacial structure. If only ordinary pipelines, slit resistance components, or inert bypass components are used as controls, the control path will not be consistent with the main membrane path in terms of membrane surface action, interfacial layer formation conditions, and shear distribution within the flow channel. This could easily lead to misinterpreting differences in module structure as differences in the history of the solution.

[0034] In some embodiments, the same batch of xanthan gum solution can be placed in the same circulation tank, and after being output by the same circulation pump, it can be split near the inlet of the membrane module to form the main membrane path and the shadow membrane path.

[0035] Optionally, to ensure the comparability of the two membrane paths, the inlet pipe length, return pipe length, and connector specifications of the main membrane path and the shadow membrane path can be kept consistent, so that the additional resistance experienced by the two membrane paths before entering the membrane module is as close as possible.

[0036] In some embodiments, the permeation side of the main membrane path can be maintained under normal drainage or controlled back pressure conditions to allow net permeation; the permeation side of the shadow membrane path can be maintained at zero or near-zero net permeation by adjusting the back pressure on the permeation side or balancing the permeate return pressure.

[0037] In this embodiment, a shadow membrane path isomorphic to the main membrane path can be set so that the two membrane paths have the most consistent interface formation conditions in the initial state. This makes the subsequent difference in response between the main membrane path and the shadow membrane path mainly reflect the difference caused by the net permeation history, rather than the difference caused by the difference in the membrane unit itself.

[0038] Next, while maintaining zero net permeation in the shadow membrane path, the same batch of xanthan gum solution can be simultaneously introduced into both the main membrane path and the shadow membrane path. The channel pressure drop and circulation flow rate of the two membrane paths in the initial stage are compared to see if they are within the preset allowable deviation range. If the deviation exceeds the preset allowable deviation range, the diversion valve, back pressure valve, or membrane clamping status is adjusted until the initial hydraulic state of the two membrane paths meets the preset consistency requirements. This initial balancing further ensures that the difference in response between the two membrane paths during the subsequent identification stage mainly originates from the net permeation history of the main membrane path, rather than assembly deviations or channel deviations.

[0039] Step 104: After the first loading of the main membrane path, switch the main membrane path to the zero-permeability or near-zero-permeability holding section, and maintain continuous flow in the main membrane path and the shadow membrane path within the zero-permeability or near-zero-permeability holding section.

[0040] In this embodiment, the first loading refers to applying a controlled net permeation load to the main membrane path during the membrane concentration start-up phase, causing the working membrane unit of the main membrane path to undergo a short-range, limited permeation drive process. This first loading is used to form an initial interface history on the membrane surface of the main membrane path corresponding to the start-up phase.

[0041] The initial interface history refers to the short-range evolution of localized chains, concentration polarization layers, and interfacial resistance near the membrane surface under net permeation conditions. Due to the high viscosity, high molecular entanglement, and interfacial structure sensitivity of the xanthan gum solution, the first loading will create a permeation-driven interfacial state near the main membrane path, different from that of the shadow membrane path. Therefore, the first loading is the starting point for subsequent instability identification.

[0042] The zero or near-zero permeability holding section refers to the process where, after the first loading is completed, the main membrane path no longer continues to advance net permeability accumulation. Instead, by adjusting the permeate side pressure of the main membrane path and / or reducing the transmembrane driving force of the main membrane path, the main membrane path enters a zero or near-zero permeability state.

[0043] When entering the zero or near-zero permeation holding section, the net permeation flux of the main membrane path is reduced to a predetermined range, while the tangential circulation of the main membrane path and the shadow membrane path remains continuous, so that the two membrane paths continue to flow in the same circulating feed system.

[0044] Zero permeability means that the net permeation volume measured by the main membrane path is approximately zero within a given sampling time.

[0045] Near-zero permeability means that the net permeation flux of the main membrane path is reduced to a preset ratio or to a preset absolute flux threshold relative to the net permeation flux at the end of the first loading.

[0046] It should be noted that setting a zero or near-zero permeability holding section is not to restore the membrane surface to its completely initial state, nor to eliminate all the interface history formed during the first loading. Rather, it is to stop or significantly reduce the continued accumulation of new net permeability history.

[0047] At the same time, by maintaining continuous flow conditions between the main membrane path and the shadow membrane path in the same circulating feed system, the overall flow recovery process of the feed can continue without introducing additional disturbances caused by shutdown and settling.

[0048] Therefore, in the zero or near-zero permeability retention section, the main membrane path retains the interface state under the influence of the previous net permeability history, while the shadow membrane path reflects the synchronous recovery state under the condition of not having experienced that net permeability history.

[0049] Maintaining continuous flow in the main membrane path and the shadow membrane path means that in the zero-permeability or near-zero-permeability maintenance section, both the main membrane path and the shadow membrane path continue to be connected to the same circulating feed system, and the feed in the two membrane paths continues to circulate along their respective channels, thereby maintaining the shear environment near the membrane surface and the hydraulic continuity in the channels.

[0050] It should be noted that this continuous flow does not require the main membrane path to continue generating effective permeation, but it does require that the main membrane path, while stopping or nearly stopping net permeation, still maintains the tangential circulation conditions that connect with the first loading stage. In the embodiments of this application, continuous flow can avoid the introduction of new deposition, stratification, or local retraction effects due to complete cessation of flow, thereby allowing the response within the holding section to more centrally reflect the overall recovery process of the feed liquid and the retention effect of past permeation history at the interface.

[0051] In some embodiments, the main membrane circuit may be first loaded to a preset first loading endpoint. This first loading endpoint may be determined by at least one of the following methods: the flux of the main membrane circuit decreases to a preset proportion range relative to the initial stable flux, the slope of the main membrane circuit transmembrane pressure difference growth is higher than a preset baseline for multiple consecutive sampling periods, or the cumulative permeate volume of the main membrane circuit reaches a preset small volume fraction of the circulating liquid volume.

[0052] After reaching the initial loading endpoint, the permeate-side pressure can be increased via the back pressure regulating valve on the main membrane path, or the average transmembrane pressure differential can be reduced via the inlet and outlet pressure linkage adjustment of the main membrane path. This allows the main membrane path to switch to a zero or near-zero permeate holding section during the initial loading phase. Simultaneously, the shadow membrane path continues to maintain a zero net permeate state and remains within the same circulating feed system as the main membrane path, ensuring that both membrane paths continue to receive the same batch of feed within the holding section.

[0053] Optionally, to prevent additional disturbances introduced during the switching process, in some embodiments, when the main membrane path is switched to the zero-permeability or near-zero-permeability holding section for the first loading, the tangential circulation flow rate of the main membrane path and the shadow membrane path can be maintained at a preset ratio of the tangential circulation flow rate at the end of the first loading. For example, the tangential circulation flow rate of the main membrane path and the shadow membrane path in the holding section can be maintained at 80% to 120% or 90% to 110% of the tangential circulation flow rate at the end of the first loading. This allows the main membrane path and the shadow membrane path to maintain a membrane shear environment approximately consistent with that of the first loading stage in the holding section, thereby avoiding additional changes in the local deposition state of the membrane surface that are unrelated to the purpose of this invention due to a sudden drop in flow rate.

[0054] Furthermore, within the zero-permeability or near-zero-permeability holding section, the main membrane path and the shadow membrane path can be kept in the same circulating feed system without introducing new changes in feed composition conditions.

[0055] The same circulating feed system refers to the main membrane path and the shadow membrane path in the holding section being continuously connected to the same batch of xanthan gum feed solution, and the feed solution temperature, pH, ionic strength and solid content environment are kept consistent, so that the response changes observed in the holding section are not masked by external liquid replacement, replenishment or changes in chemical conditions.

[0056] In this embodiment, a zero-permeability or near-zero-permeability holding section is set after the first loading, and continuous flow is required in both the main membrane path and the shadow membrane path. On the one hand, this can suppress the accumulation of new permeation history by pushing the net permeation of the main membrane path to a near-cutoff or near-cutoff. On the other hand, by maintaining continuous flow in both membrane paths, the overall recovery process of the feed solution can occur simultaneously in both the main membrane path and the shadow membrane path. In this way, subsequent judgment no longer relies on the apparent recovery of the main membrane path alone, but is based on the fact that the previous permeation history of the main membrane path already exists, while the shadow membrane path has not experienced that permeation history, but both are in the same circulating feed solution and approximately the same shear environment in the holding section. This improves the ability of subsequent identification results to distinguish instability symptoms from different sources.

[0057] Step 106: Based on the response of the shadow film path in the zero or near-zero transmittance holding range, determine whether the shadow film path has returned to the batch reference recovery range.

[0058] The response of the shadow membrane path in the zero or near-zero permeability holding section refers to the response information exhibited by the shadow membrane path in the zero or near-zero permeability holding section, which can characterize the degree of recovery of the overall flow of the current circulating feed liquid.

[0059] Optionally, the response of the shadow membrane path at zero permeability may include the channel pressure drop, circulation flow rate, and equivalent flow resistance index obtained by combining the channel pressure drop and circulation flow rate.

[0060] Correspondingly, since the shadow membrane path uses the same membrane material and the same flow channel structure as the main membrane path, but does not undertake net permeation propulsion, the response of the shadow membrane path in the holding section mainly reflects the overall flow recovery state of the same batch of xanthan gum solution under continuous circulation conditions, without superimposing the local interface permeation effect formed by the previous net permeation history of the main membrane path.

[0061] In this embodiment, the batch baseline recovery interval is not a fixed threshold uniformly set for all batches, but rather an intra-batch reference interval established for the current batch of xanthan gum solution. For example, before the first loading begins, when the shadow membrane path maintains zero net permeability and both the main membrane path and the shadow membrane path are in a stable circulation state, the initial channel pressure drop and initial circulation flow rate of the shadow membrane path can be continuously collected over multiple sampling cycles to form the baseline data for that batch. In this way, the recovery interval established based on the baseline data can adaptively change with the viscosity, solid content, and association state of the current batch of xanthan gum solution, thereby avoiding misjudgments caused by batch differences when using a uniform fixed threshold.

[0062] In some embodiments, the difference between the inlet pressure and the outlet pressure of the shadow membrane path can be defined as the shadow membrane path channel pressure drop, denoted as . The circulating volume through the shadow membrane path per unit time is defined as the shadow membrane path circulation flow rate, denoted as . Continuous data collection before the first loading begins. Within each sampling period and Calculate the average value of each batch: in, For the first Initial channel pressure drop of the shadow membrane path per sampling period, For the first Initial circulation flow rate of the shadow membrane path in each sampling period. This represents the average initial channel pressure drop of the current batch of shadow membrane circuits. This represents the average initial circulation flow rate of the current batch of shadow membrane path.

[0063] Within the zero or near-zero permeability holding section, the channel pressure drop of the shadow membrane path at the current moment can be continuously collected. and circulating flow In some implementations, a relative deviation method can be used to determine whether the shadow film path has returned to the batch reference recovery range. That is, the shadow film path is determined to have returned to the batch reference recovery range when the following conditions are met simultaneously: in, This is the allowable deviation ratio for pressure drop. This represents the allowable deviation percentage for the circulating flow rate.

[0064] This judgment method can, on the one hand, simultaneously constrain the two interrelated flow quantities of pressure drop and flow rate, reducing the impact of random fluctuations when judging based on a single indicator; on the other hand, by requiring that the conditions be met for multiple consecutive sampling periods, it can reduce the probability of false triggering caused by instantaneous disturbances, bubble passage, or local backflow fluctuations.

[0065] In some implementations, to further enhance adaptability to the characteristics of the current batch, a batch baseline recovery interval can also be established using statistical fluctuation intervals. For example, in Based on the initial sampling period, the standard deviations of the initial channel pressure drop and initial circulating flow rate of the shadow membrane path were calculated respectively. and The batch baseline recovery range is defined as follows: and in, and This is the amplification factor. Using this batch-based recovery interval determination method allows for the consideration of the natural fluctuations within the initial sampling period of the same batch. This ensures that the recovery interval does not deviate from the actual state of the current batch, while also avoiding setting the interval too narrowly, which would lead to overly stringent recovery criteria.

[0066] For example, assuming 20L of the same batch of xanthan gum solution is placed in a circulation tank, the solution temperature is controlled at 30℃, and both the main membrane path and the shadow membrane path maintain a circulation flow rate of 0.90L / min, with the shadow membrane path maintaining zero net permeation. Before the first loading begins, the initial channel pressure drop and initial circulation flow rate of the shadow membrane path are collected over 10 consecutive sampling periods, with a sampling period of 10s, yielding the following data: The initial channel pressure drops of the shadow membrane path were 29.8, 30.1, 30.0, 29.9, 30.2, 29.8, 30.0, 29.9, 30.1, and 30.0 kPa, respectively. The initial circulation flow rates of the shadow membrane circuit were 0.902, 0.898, 0.900, 0.901, 0.899, 0.900, 0.901, 0.899, 0.900, and 0.900 L / min, respectively.

[0067] Therefore, we can calculate: , Meanwhile, assuming the allowable deviation ratio of pressure drop is taken. Permissible deviation ratio of circulating flow Furthermore, the recovery condition must be met simultaneously for six consecutive sampling cycles before the shadow membrane path is considered to have returned to the batch baseline recovery range. Therefore, the pressure drop recovery range can be determined as follows: ; The traffic recovery range is: .

[0068] After the first loading of the main membrane path is completed and the system switches to a zero-permeability or near-zero-permeability holding section, the response of the shadow membrane path is continuously monitored within the holding section. Assume that over a certain period of six consecutive sampling cycles, the channel pressure drops measured in the shadow membrane path are 30.6, 30.4, 30.2, 30.1, 30.0, and 30.1 kPa, and the circulating flow rates are 0.892, 0.895, 0.897, 0.899, 0.901, and 0.900 L / min, respectively. Since the pressure drops and circulating flow rates in these six sampling cycles all fall within the corresponding recovery range, it is determined that the shadow membrane path has returned to the batch baseline recovery range, and a second loading of the main membrane path is permitted.

[0069] If, in another batch, during the holding period after the first loading of the main membrane path, the channel pressure drop measured for six consecutive sampling cycles of the shadow membrane path is 33.2, 32.8, 32.5, 32.3, 32.1, and 31.9 kPa, and the circulating flow rate is 0.861, 0.865, 0.867, 0.869, 0.870, and 0.872 L / min, respectively, then since the pressure drop and flow rate have not continuously returned to the recovery range, it is determined that the shadow membrane path has not yet returned to the batch baseline recovery range. In this case, the zero or near-zero permeability holding period is maintained, and the second loading of the main membrane path is not initiated.

[0070] Through the above implementation method, whether the shadow film path returns to the batch baseline recovery range no longer depends on a single fixed threshold, but is determined based on the baseline data and continuous recovery status of the current batch of xanthan gum solution. This not only reflects the differences in viscosity and structural state between different batches of xanthan gum solution, but also improves the consistency of the premises for subsequent instability identification steps.

[0071] Step 108: After the shadow membrane path returns to the batch baseline recovery range, a second loading is applied to the main membrane path.

[0072] The second loading refers to reapplying net permeation drive to the main membrane path after the shadow membrane path has returned to the batch baseline recovery range, so that the main membrane path enters the controlled loading state again.

[0073] Returning to the batch baseline recovery range means that during the zero or near-zero transmission period of the shadow membrane path, its channel pressure drop and circulation flow rate have fallen into the baseline recovery range established based on the current batch for multiple consecutive sampling cycles.

[0074] In this embodiment, since the shadow membrane path does not undertake net permeation propulsion, the shadow membrane path returns to the batch baseline recovery range, which is used to characterize that the overall flow recovery of the current circulating feed system has reached a predetermined level.

[0075] When the shadow membrane path returns to the batch baseline recovery range, a second loading is applied to the main membrane path. This can minimize the interference of the overall feed liquid not yet recovering on the results of the second loading of the main membrane path, and make the second loading more focused on reflecting the interface effects left over from the previous net permeation history of the main membrane path.

[0076] The loading trajectory refers to the driving change path followed by the main membrane path during loading, which may include the rising path of transmembrane pressure difference, the setting path of net permeate flux, and the increasing path of cumulative permeate volume per unit time.

[0077] In this embodiment of the application, in order to make the second loading comparable to the first loading, the second loading can be performed according to the same loading trajectory as the first loading.

[0078] Optionally, in other implementations, a loading trajectory that is limited to decreasing relative to the first loading may also be adopted, that is, the target drive level of the second loading is lower than or equal to the drive level at the corresponding moment of the first loading, but its trend of change is consistent with that of the first loading.

[0079] In practical applications, after the shadow membrane path returns to the batch baseline recovery range, the pressure on the permeate side can be gradually reduced by the back pressure regulating valve on the permeate side of the main membrane path, and / or the cross-membrane driving force can be gradually restored by the pressure regulating valve on the feed side of the main membrane path, so that the main membrane path switches from the zero or near-zero permeate holding stage to the second loading stage.

[0080] Optionally, the starting conditions for the second loading can be consistent with or within the allowable deviation range of the starting conditions for the first loading, including keeping the main membrane circulation flow rate, feed temperature, pH, ionic strength, and total volume of the circulating liquid constant.

[0081] Optionally, during the second loading start-up, the main membrane path and the shadow membrane path still need to be connected to the same circulating feed system to avoid masking the difference in response that is actually caused by previous transmission history during the second loading process due to fluid replacement, replenishment, or changes in external conditions.

[0082] Step 110: When the main membrane path deteriorates during the second loading, the main membrane path is switched to zero net permeability to obtain the main membrane path response information. Based on the loading trajectory of the second loading, the shadow membrane path is loaded to obtain the shadow membrane path response information.

[0083] In this embodiment, when the main membrane path deteriorates due to forward movement, the main membrane path can be switched to zero net permeation. After the main membrane path is switched to zero net permeation, the shadow membrane path is loaded according to the loading trajectory of the second loading. When the main membrane path is switched to zero net permeation and the shadow membrane path is loaded according to the loading trajectory of the second loading, the main membrane path and the shadow membrane path are kept in the same circulating feed system, and the response information of the main membrane path and the response information of the shadow membrane path are obtained according to the resistance drop of the main membrane path and the resistance increase of the shadow membrane path.

[0084] Switching the main membrane path to zero net permeation means that after the main membrane path has deteriorated and shifted forward, the net permeation flux of the main membrane path is reduced to zero or nearly zero by adjusting the pressure on the permeation side of the main membrane path and / or the transmembrane driving force of the main membrane path, thereby stopping the new net permeation propulsion of the main membrane path.

[0085] It should be noted that this switching action, while maintaining continuous flow in the main membrane path, cuts off the superposition of new net permeation history in the main membrane path, allowing the subsequent response of the main membrane path to more concentratedly reflect the interface state changes already formed in the previous stage. The main membrane path response information obtained in this way is mainly used to characterize the resistance drop after the main membrane path switches to zero net permeation.

[0086] Among them, loading the shadow membrane path based on the loading trajectory of the second loading means that after the main membrane path is switched to zero net permeability, the shadow membrane path no longer maintains the original zero net permeability state, but is loaded according to the loading trajectory used when the main membrane path is loaded for the second time.

[0087] In practical implementation, when the main membrane path deteriorates due to forward displacement, the transmembrane pressure difference, flux, and corresponding operating status of the shadow membrane path at the moment of this deterioration can be recorded as initial references for subsequent response comparisons. Subsequently, the main membrane path is switched to zero net permeation through adjustment of the back pressure on the permeate side or linkage adjustment of the inlet and outlet pressures, thus stopping or nearly stopping net permeation. Simultaneously, the shadow membrane path begins loading based on the loading trajectory of the second loading.

[0088] Optionally, the loading starting point of the shadow membrane path can be consistent with the loading level corresponding to the forward deterioration of the second loading of the main membrane path, or the shadow membrane path can continue to advance from the second loading starting point along the same loading trajectory, so as to ensure that the loading conditions borne by the shadow membrane path are comparable to the second loading of the main membrane path.

[0089] When the main membrane path is switched to zero net permeability and the shadow membrane path is loaded according to the loading trajectory of the second loading, the main membrane path and the shadow membrane path can be kept in the same circulating feed system. Here, being in the same circulating feed system means that the main membrane path and the shadow membrane path are continuously connected to the same batch of xanthan gum feed, and they share the feed in the same circulating tank, and no new changes in the circulating fluid conditions are introduced during this stage.

[0090] After the main membrane path switches to zero net permeation, the transmembrane pressure difference and flux are continuously collected over multiple sampling periods. Here, multiple sampling periods refer to several fixed time intervals of sampling windows after the main membrane path switches to zero net permeation, such as 5s, 10s, or 20s per sampling period, with 5, 6, or 10 sampling periods collected consecutively. Then, based on the changes in transmembrane pressure difference and / or flux before and after the main membrane path switches to zero net permeation, the magnitude of the resistance reduction in the main membrane path is determined, and the main membrane path response information is obtained. If the transmembrane pressure difference shows a decreasing trend and / or the flux shows an increasing trend after switching to zero net permeation, it indicates that the resistance of the main membrane path has decreased; if the transmembrane pressure difference remains at a high level and the flux does not recover significantly after switching to zero net permeation, it indicates that the resistance of the main membrane path has not decreased significantly.

[0091] The main membrane response information can be specifically represented by one or more of the following: the transmembrane pressure difference, flux difference, difference integral, or fallback rate before and after the main membrane switching.

[0092] Correspondingly, when the shadow membrane path is loaded according to the loading trajectory, the transmembrane pressure difference and flux can be continuously collected over multiple sampling periods. Then, based on the changes in transmembrane pressure difference and / or flux under the loading trajectory, the resistance increase of the shadow membrane path can be determined, and the response information of the shadow membrane path can be obtained.

[0093] Specifically, if the shadow membrane path exhibits a rapid increase in transmembrane pressure difference, an early decrease in flux, or both, corresponding to the deterioration of the main membrane path's forward movement under the loading trajectory, it can be considered that the shadow membrane path has experienced a corresponding increase in resistance under the loading trajectory; if the shadow membrane path does not reproduce this type of response under the loading trajectory, it can be considered that the shadow membrane path has not experienced an increase in resistance corresponding to the deterioration of the main membrane path's forward movement.

[0094] The response information of the shadow membrane path can be one or more of the following: the increase in transmembrane pressure difference, the decrease in flux, the increase rate, or the decrease rate of the shadow membrane path under the loading trajectory.

[0095] Optionally, to improve the comparability of the response information of the main membrane path and the shadow membrane path, in some embodiments, the sampling window of the main membrane path after switching to zero net permeability and the sampling window of the shadow membrane path during loading according to the loading trajectory can be set synchronously. That is, the main membrane path and the shadow membrane path collect transmembrane pressure difference and flux data respectively within the same number of sampling periods. In this way, the resistance reduction of the main membrane path and the resistance increase of the shadow membrane path can be compared on a unified time scale, reducing the judgment bias caused by inconsistent sampling windows.

[0096] Step 112: Identify the instability type of xanthan gum solution based on the main membrane path response information and the shadow membrane path response information.

[0097] In this embodiment of the application, when identifying the instability type of xanthan gum solution based on the response information of the main membrane path and the response information of the shadow membrane path, it is possible to first determine whether the main membrane path has experienced forward deterioration during the second loading based on the response information of the main membrane path during the second loading. If the main membrane path does not experience forward deterioration during the second loading, it is identified as a reversible polarization state. Alternatively, if the main membrane path experiences forward deterioration during the second loading, and if the resistance of the main membrane path drops after switching to zero net permeability, and the shadow membrane path does not reproduce the resistance increase response corresponding to forward deterioration after loading according to the loading trajectory, it is identified as an interface lock-in risk.

[0098] Alternatively, if the main membrane path deteriorates during the second loading process, and remains in a high-resistance state after switching to zero net permeability, it is identified as an irreversible fouling risk.

[0099] Alternatively, if the main membrane path deteriorates during the second loading, and the shadow membrane path reproduces the resistance increase response corresponding to the deterioration after loading according to the loading trajectory, it is identified as an irreversible fouling risk.

[0100] Among them, the response information of the main membrane circuit during the second loading refers to the information related to the loading response collected by the main membrane circuit during the second loading process.

[0101] Optionally, the response information of the main membrane circuit during the second loading may include the transmembrane pressure difference of the main membrane circuit, the flux of the main membrane circuit, and the magnitude, rate of change, or interval integral value derived from the two.

[0102] Precession-induced deterioration refers to the phenomenon where, during the second loading process, the main membrane circuit exhibits an earlier decrease in flux, an increase in transmembrane pressure differential, or a combination of both, compared to the first loading, within the same loading interval. In other words, premature deterioration means that the corresponding increase in resistance or attenuation occurs earlier in the second loading process compared to the first loading process, in terms of time location, loading location, or interval integral.

[0103] Among them, resistance decline refers to the decrease in transmembrane pressure difference and / or recovery of flux of the main membrane path after switching to zero net permeability, which indicates that the interfacial resistance of the main membrane path has declined.

[0104] The resistance increase response refers to the increase in transmembrane pressure and / or decrease in flux of a shadow membrane path after loading along the loading trajectory, which characterizes the increase in resistance of the shadow membrane path under the loading trajectory.

[0105] The reproduction of the resistance increase response corresponding to the forward deterioration refers to the resistance increase response exhibited by the shadow membrane path under the loading trajectory, which corresponds to the forward deterioration of the main membrane path in the second loading in terms of direction, trend and / or degree of change.

[0106] In some implementations, when the main membrane path deteriorates during the second loading, and its resistance decreases after switching to zero net permeation, while the shadow membrane path does not reproduce the resistance increase response corresponding to the deterioration after loading along the loading trajectory, an interface lock-in risk is identified. The logic here is that the deterioration of the main membrane path during the second loading is not solely caused by insufficient overall recovery of the current circulating feed solution; otherwise, the shadow membrane path should also exhibit a corresponding resistance increase response under the same loading trajectory. Furthermore, the resistance decrease after switching to zero net permeation indicates that the abnormal resistance increase in the main membrane path is at least partially dependent on the previous net permeation advance. Therefore, under the combined condition of the main membrane path's resistance decrease and the shadow membrane path's resistance not reappearing, this batch of xanthan gum feed solution can be identified as having an interface lock-in risk.

[0107] In other implementations, when the main membrane path deteriorates during the second loading and remains in a high-resistivity state after switching to zero net permeation, it can be identified as an irreversible fouling risk. "Remaining in a high-resistivity state" here means that after switching to zero net permeation, the transmembrane pressure difference of the main membrane path does not show a significant decrease and / or the flux does not show a significant recovery.

[0108] Furthermore, in some implementations, even if a certain degree of resistance drop occurs after the main membrane path is switched to zero net permeability, as long as the shadow membrane path reproduces the resistance increase response corresponding to the forward deterioration after loading according to the loading trajectory, it can be identified as an irreversible fouling risk.

[0109] Optionally, to improve the stability of instability type identification, quantitative indicators can be used in some implementations to assist the above identification process. The resistance reduction magnitude of the main membrane path can be calculated from the changes in transmembrane pressure difference and / or flux before and after the main membrane path switches to zero net permeability; the resistance increase of the shadow membrane path can be calculated from the changes in transmembrane pressure difference and / or flux before and after the shadow membrane path is loaded according to the loading trajectory. When the resistance reduction magnitude of the main membrane path exceeds a preset reduction threshold, and the resistance increase of the shadow membrane path is lower than a preset recurrence threshold, it can be identified as an interface lock-in risk; when the resistance reduction magnitude of the main membrane path is lower than the preset reduction threshold, or the resistance increase of the shadow membrane path reaches the preset recurrence threshold, it can be identified as an irreversible fouling risk. In this way, the judgments such as resistance reduction recurrence and resistance increase response corresponding to forward deterioration can be made into measurable and comparable quantitative conditions.

[0110] The method provided in this application involves simultaneously introducing the same batch of xanthan gum solution into the main membrane path and the shadow membrane path. After the first loading of the main membrane path, a zero-permeability or near-zero-permeability holding section is set. Whether the shadow membrane path returns to the batch baseline recovery range within this holding section is used as the starting condition for the second loading. When the main membrane path deteriorates due to forward movement during the second loading, the main membrane path is switched to zero net permeability, and the shadow membrane path is loaded based on the loading trajectory of the second loading to obtain the response information of the main membrane path and the response information of the shadow membrane path respectively. In this way, the abnormal response caused by insufficient overall recovery of the xanthan gum solution can be distinguished from the interface instability symptoms induced by the previous net permeability history during the membrane concentration start-up stage. This improves the accuracy of instability type identification and the reliability of identification during the membrane concentration start-up stage.

[0111] To address the problem in existing technologies where the identification of anomalies during the start-up of xanthan gum liquid film concentration relies primarily on a single-path response, making it difficult to consistently distinguish between instability symptoms originating from different sources, thus leading to inaccurate identification of instability types during the film concentration start-up phase, this application provides an instability identification device for the start-up phase of xanthan gum liquid film concentration. A schematic diagram of the specific structure of this device is shown below. Figure 2 As shown, it includes an import module 21, a switching module 22, a judgment module 23, a loading module 24, a processing module 25, and a recognition module 26. The functions of each module are as follows: The module 21 is used to introduce the same batch of xanthan gum solution into the main membrane path and the shadow membrane path. The main membrane path is equipped with a working membrane unit, and the shadow membrane path is equipped with a shadow membrane unit. The shadow membrane unit and the working membrane unit use the same membrane material and the same flow channel structure. The switching module 22 is used to switch the main membrane path to a zero-permeability or near-zero-permeability holding section after the first loading of the main membrane path, and to maintain continuous flow in the main membrane path and the shadow membrane path within the zero-permeability or near-zero-permeability holding section. The judgment module 23 is used to determine whether the shadow film path has returned to the batch reference recovery range based on the response of the shadow film path in the zero or near-zero transmittance holding section. The loading module 24 is used to perform a second loading on the main membrane path after the shadow membrane path returns to the batch reference recovery range; The processing module 25 is used to switch the main membrane path to zero net permeability when the main membrane path deteriorates during the second loading, obtain the main membrane path response information, and load the shadow membrane path based on the loading trajectory of the second loading to obtain the shadow membrane path response information. The identification module 26 is used to identify the instability type of xanthan gum solution based on the main membrane path response information and the shadow membrane path response information.

[0112] Optionally, the judgment module 23 is used for: While maintaining zero permeability in the shadow membrane path, the initial pressure drop and initial circulation flow rate of the shadow membrane path were continuously collected in multiple sampling cycles to establish a batch baseline; During the zero or near-zero permeability maintenance phase, the pressure drop and circulation flow rate of the shadow membrane path are continuously collected; Whether the shadow membrane path has returned to the batch baseline recovery range is determined by whether the pressure drop and circulation flow rate of the shadow membrane path return to the allowable deviation range of the batch baseline in multiple consecutive sampling cycles.

[0113] Optionally, switching module 22 is used for: Reduce the net permeability of the main membrane path to zero or preset near-zero permeability range; After the net permeation of the main membrane path drops to zero or the preset near-zero permeation range, the main membrane path and the shadow membrane path are kept in continuous flow. During the zero or near-zero permeation maintenance phase, the main membrane path and the shadow membrane path are maintained in a continuous circulation state based on the same circulating feed solution.

[0114] Optionally, processing module 25 includes: The switching unit is used to switch the main membrane path to zero net permeation when the main membrane path deteriorates due to forward shift. The loading unit is used to load the shadow membrane path according to the loading trajectory of the second loading after the main membrane path is switched to zero net permeability; The processing unit is used to maintain the main membrane path and the shadow membrane path in the same circulating feed system when the main membrane path switches to zero net permeability and the shadow membrane path is loaded according to the loading trajectory of the second loading. It also obtains the response information of the main membrane path and the response information of the shadow membrane path according to the resistance drop of the main membrane path and the resistance increase of the shadow membrane path.

[0115] Optional, processing unit, used for: After the main membrane path is switched to zero net permeation, the transmembrane pressure difference and flux are continuously collected during multiple sampling cycles of the main membrane path; Based on the changes in transmembrane pressure difference and / or flux before and after the main membrane path is switched to zero net permeation, the magnitude of the resistance drop in the main membrane path is determined, and the main membrane path response information is obtained. While the shadow membrane path is being loaded according to the loading trajectory, the transmembrane pressure difference and flux of the shadow membrane path are continuously collected in multiple sampling cycles. Based on the changes in transmembrane pressure difference and / or flux of the shadow membrane path under the loading trajectory, the resistance increase of the shadow membrane path is determined, and the response information of the shadow membrane path is obtained.

[0116] Optionally, the identification module 26 is used for: Based on the response information of the main membrane circuit during the second loading, determine whether the main membrane circuit has deteriorated due to forward shift during the second loading; When the main membrane pathway does not show forward shift or deterioration during the second loading, it is identified as a reversible polarization state; or, If the main membrane path deteriorates during the second loading, and if the resistance drops after switching to zero net permeability, and the shadow membrane path does not reproduce the resistance increase response corresponding to the deterioration during loading according to the loading trajectory, then it is identified as an interface lock-in risk.

[0117] Optionally, the recognition module 26 is also used for: If the main membrane path deteriorates during the second loading, and if the main membrane path remains in a high-resistance state after switching to zero net permeability, it is identified as an irreversible fouling risk. Alternatively, if the main membrane path deteriorates during the second loading, and the shadow membrane path reproduces the resistance increase response corresponding to the deterioration after loading according to the loading trajectory, it is identified as an irreversible fouling risk.

[0118] Using the device provided in this application embodiment, the same batch of xanthan gum solution is simultaneously introduced into the main membrane path and the shadow membrane path. After the first loading of the main membrane path, a zero-permeability or near-zero-permeability holding section is set. Whether the shadow membrane path returns to the batch baseline recovery range within the holding section is used as the starting condition for the second loading. When the main membrane path deteriorates due to forward movement during the second loading, the main membrane path is switched to zero net permeability, and the shadow membrane path is loaded based on the loading trajectory of the second loading to obtain the response information of the main membrane path and the response information of the shadow membrane path respectively. In this way, the abnormal response caused by insufficient overall recovery of the xanthan gum solution can be distinguished from the interface instability symptoms induced by the previous net permeability history during the membrane concentration start-up stage. This can improve the accuracy of instability type identification and the reliability of identification during the membrane concentration start-up stage.

[0119] Figure 3 To illustrate the hardware structure of an electronic device according to various embodiments of this application, the electronic device may include a processor 301 and a memory 302 storing computer program instructions. Specifically, the processor 301 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0120] Memory 302 may include mass storage for data or instructions. For example, and not limitingly, memory 302 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 302 may include removable or non-removable (or fixed) media. Where appropriate, memory 302 may be internal or external to an electronic device. In a particular embodiment, memory 302 may be a non-volatile solid-state memory.

[0121] In one embodiment, memory 302 may be read-only memory (ROM). In one embodiment, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0122] The processor 301 reads and executes the computer program instructions stored in the memory 302 to implement any of the instability identification methods in the start-up stage of xanthan gum liquid film concentration in the above embodiments.

[0123] In one example, the electronic device may also include a communication interface 303 and a bus 310. For example, Figure 3 As shown, the processor 301, memory 302, and communication interface 303 are connected through bus 310 and complete communication with each other.

[0124] The communication interface 303 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0125] Bus 310 includes hardware, software, or both, that couples components of an electronic device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 310 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, this application contemplates any suitable bus or interconnect.

[0126] Furthermore, in conjunction with the instability identification method for the xanthan gum liquid film concentration start-up stage in the above embodiments, this application embodiment can provide a computer-readable storage medium for implementation. This computer-readable storage medium stores computer program instructions; when executed by a processor, these computer program instructions implement any one of the instability identification methods for the xanthan gum liquid film concentration start-up stage in the above embodiments.

[0127] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0128] The above description is merely a specific implementation example of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0129] Secondly, those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0130] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0131] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0132] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0133] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0134] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0135] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0136] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0137] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A method for identifying instability during the start-up phase of xanthan gum liquid film concentration, characterized in that, include: The same batch of xanthan gum solution is introduced into the main membrane path and the shadow membrane path. The main membrane path is equipped with a working membrane unit, and the shadow membrane path is equipped with a shadow membrane unit. The shadow membrane unit and the working membrane unit use the same membrane material and the same flow channel structure. After the first loading of the main membrane path, the main membrane path is switched to a zero-permeability or near-zero-permeability holding section, and the main membrane path and the shadow membrane path are kept in continuous flow within the zero-permeability or near-zero-permeability holding section; Based on the response of the shadow film path within the zero transmittance or near-zero transmittance holding section, it is determined whether the shadow film path has returned to the batch reference recovery range; Once the shadow membrane path returns to the batch baseline recovery range, a second loading is applied to the main membrane path; When the main membrane path deteriorates due to forward shift during the second loading, the main membrane path is switched to zero net permeability to obtain the main membrane path response information. Based on the loading trajectory of the second loading, the shadow membrane path is loaded to obtain the shadow membrane path response information. The instability type of the xanthan gum solution is identified based on the main membrane path response information and the shadow membrane path response information.

2. The method as described in claim 1, characterized in that, The step of determining whether the shadow film path has returned to the batch baseline recovery range based on the response of the shadow film path within the zero transmittance or near-zero transmittance holding range includes: While maintaining zero permeability in the shadow membrane path, the initial pressure drop and initial circulation flow rate of the shadow membrane path are continuously collected in multiple sampling cycles to establish a batch baseline; During the zero or near-zero permeability maintenance phase, the pressure drop and circulation flow rate of the shadow membrane path are continuously collected; Based on whether the pressure drop and circulation flow rate of the shadow membrane path return to the allowable deviation range of the batch baseline within multiple consecutive sampling cycles, it is determined whether the shadow membrane path has returned to the batch baseline recovery range.

3. The method as described in claim 1, characterized in that, The step of switching the main membrane path to a zero-permeability or near-zero-permeability holding section, and maintaining continuous flow in the main membrane path and the shadow membrane path within the zero-permeability or near-zero-permeability holding section, includes: Reduce the net permeability of the main membrane path to zero or a preset near-zero permeability range; After the net permeability of the main membrane path drops to zero or a preset near-zero permeability range, the main membrane path and the shadow membrane path are kept in continuous flow. During the zero or near-zero permeation holding phase, the main membrane path and the shadow membrane path are maintained in a continuous circulation state based on the same circulating feed solution.

4. The method as described in claim 1, characterized in that, The step of switching the main membrane path to zero net permeability to obtain the main membrane path response information, and loading the shadow membrane path based on the loading trajectory of the second loading to obtain the shadow membrane path response information, includes: When the main membrane path deteriorates due to forward shift, the main membrane path is switched to zero net permeation. After the main membrane path is switched to zero net permeability, the shadow membrane path is loaded according to the loading trajectory of the second loading. When the main membrane path is switched to zero net permeability and the shadow membrane path is loaded according to the loading trajectory of the second loading, the main membrane path and the shadow membrane path are kept in the same circulating feed system, and the response information of the main membrane path and the response information of the shadow membrane path are obtained according to the resistance drop of the main membrane path and the resistance increase of the shadow membrane path.

5. The method as described in claim 4, characterized in that, The step of obtaining the response information of the main membrane path and the response information of the shadow membrane path based on the resistance drop amplitude of the main membrane path and the resistance increase of the shadow membrane path includes: After the main membrane path is switched to zero net permeation, the transmembrane pressure difference and flux of the main membrane path are continuously collected during multiple sampling cycles. Based on the changes in transmembrane pressure difference and / or flux before and after the main membrane path is switched to zero net permeation, the resistance drop amplitude of the main membrane path is determined, and the response information of the main membrane path is obtained. While the shadow membrane path is being loaded according to the loading trajectory, the transmembrane pressure difference and flux of the shadow membrane path are continuously collected in multiple sampling periods. Based on the changes in transmembrane pressure difference and / or flux of the shadow membrane path under the loading trajectory, the resistance increase of the shadow membrane path is determined, and the response information of the shadow membrane path is obtained.

6. The method as described in claim 1, characterized in that, The step of identifying the instability type of the xanthan gum solution based on the main membrane response information and the shadow membrane response information includes: Based on the response information of the main membrane path during the second loading, it is determined whether the main membrane path experiences forward displacement and deterioration during the second loading. When the main membrane path does not exhibit forward shift or deterioration during the second loading, it is identified as a reversible polarization state; or, If the main membrane path deteriorates during the second loading, and if the resistance drops after the main membrane path switches to zero net permeability, and the shadow membrane path does not reproduce the resistance increase response corresponding to the deterioration after loading according to the loading trajectory, then it is identified as an interface lock-in risk.

7. The method as described in claim 6, characterized in that, The method further includes: When the main membrane path deteriorates during the second loading, if the main membrane path remains in a high-resistance state after switching to zero net permeability, it is identified as an irreversible fouling risk. Alternatively, if the main membrane path experiences the forward deterioration during the second loading, and the shadow membrane path reproduces the resistance increase response corresponding to the forward deterioration after loading according to the loading trajectory, it is identified as an irreversible fouling risk.

8. A device for identifying instability during the start-up phase of xanthan gum liquid film concentration, characterized in that, It includes an import module, a switching module, a judgment module, a loading module, a processing module, and a recognition module, among which: An inlet module is used to introduce the same batch of xanthan gum solution into the main membrane path and the shadow membrane path. The main membrane path is equipped with a working membrane unit, and the shadow membrane path is equipped with a shadow membrane unit. The shadow membrane unit and the working membrane unit use the same membrane material and the same flow channel structure. The switching module is used to switch the main membrane path to a zero-permeability or near-zero-permeability holding section after the first loading of the main membrane path, and to maintain continuous flow of the main membrane path and the shadow membrane path within the zero-permeability or near-zero-permeability holding section; The judgment module is used to determine whether the shadow film path has returned to the batch reference recovery range based on the response of the shadow film path in the zero transmittance or near-zero transmittance holding section. The loading module is used to perform a second loading on the main film path after the shadow film path returns to the batch reference recovery range; The processing module is used to switch the main membrane path to zero net permeability when the main membrane path deteriorates during the second loading, obtain the main membrane path response information, and load the shadow membrane path based on the loading trajectory of the second loading to obtain the shadow membrane path response information. The identification module is used to identify the instability type of the xanthan gum solution based on the main membrane path response information and the shadow membrane path response information.

9. An electronic device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the instability identification method for the start-up phase of xanthan gum liquid film concentration as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the instability identification method for the start-up phase of xanthan gum liquid film concentration as described in any one of claims 1 to 7.

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