Packaging control method and system for liquid fertilizer production

Abstract

The application belongs to the field of fertilizer packaging control, and discloses a packaging control method and system for liquid fertilizer production. The temperature of liquid fertilizer, the workshop environment temperature and the packaging queuing waiting time in the packaging link of liquid fertilizer production are obtained. The deviation of the workshop environment temperature and the preset value is calculated to obtain an environment temperature deviation value. According to the environment temperature deviation value, an environment temperature compensation coefficient is determined. The waiting time compensation coefficient is determined in combination with the packaging queuing waiting time. The sum of 1 and the two compensation coefficients is taken as a temperature comprehensive adjustment coefficient. The stage basic temperature corresponding to the current conveying stage is obtained. The product of the stage basic temperature and the temperature comprehensive adjustment coefficient is calculated to obtain a stage target temperature. The temperature of the liquid fertilizer in the current conveying stage is adjusted to the target value. The conveying stage includes three stages of fresh discharging, transfer temporary storage and packaging waiting. The scheme can realize automatic parameter control in multiple conveying stages of liquid fertilizer packaging, and improve the temperature control accuracy of the packaging link.

Description

Technical Field

[0001] This application relates to the field of fertilizer packaging control technology, and more specifically, to a packaging control method and system for liquid fertilizer production. Background Technology

[0002] In the industrial packaging production process of liquid fertilizers, material conveying is a core link that runs through multiple processes. Currently, the industry typically sets corresponding operating parameters for each conveying stage to match the processing cycle time, material conveying volume, and process adaptation requirements of different processes. Under the existing production model, the setting and adjustment of relevant parameters generally rely on operators to manually complete the task based on production experience and changes in on-site working conditions. Some production lines are equipped with basic parameter acquisition devices, which only realize the real-time display of operating parameters for each conveying stage and the function of over-limit alarms. The adjustment, verification, and adaptation of parameters still require manual intervention to ensure the operational coordination of each conveying link and subsequent packaging process, and to meet the packaging production needs of different production capacities and product specifications of liquid fertilizers.

[0003] The liquid fertilizer packaging process involves multiple conveying stages that cannot be automatically controlled, requiring operators to monitor the operational status of each stage in real time. When changes occur in conveying volume or process cycle time, the operating parameters for the corresponding conveying stage cannot be automatically adjusted, easily leading to a mismatch between conveying flow rate and filling process requirements. This can result in filling accuracy deviations, material overflow, or insufficient supply. Furthermore, manual parameter adjustments suffer from response lag, and the accuracy depends heavily on operator experience. The lack of coordination between parameter adjustments across different conveying stages can easily cause cycle time disruptions, increasing production line downtime for adjustments and raising the probability of producing defective packaged products, thus adding extra production costs. This approach is unsuitable for the highly automated and stable operational requirements of liquid fertilizer packaging production lines. Summary of the Invention

[0004] The purpose of this application is to provide a packaging control method and system for liquid fertilizer production, which solves the technical problem that automatic parameter control cannot be performed in multiple conveying stages of the liquid fertilizer packaging process, and achieves the technical effect of automatic parameter control in multiple conveying stages of the liquid fertilizer packaging process.

[0005] In a first aspect, embodiments of this application provide a packaging control method for liquid fertilizer production. The method includes: acquiring the temperature of the liquid fertilizer in the liquid fertilizer production packaging, the workshop ambient temperature, and the packaging queuing waiting time; determining the deviation value between the workshop ambient temperature and a preset workshop ambient temperature as the ambient temperature deviation value; determining an ambient temperature compensation coefficient based on the ambient temperature deviation value; determining a waiting time compensation coefficient based on the packaging queuing waiting time; determining the sum of 1 and the ambient temperature compensation coefficient and the waiting time compensation coefficient as a comprehensive temperature adjustment coefficient; acquiring the stage base temperature corresponding to the current conveying stage; determining the product of the stage base temperature and the comprehensive temperature adjustment coefficient as the stage target temperature; and adjusting the liquid fertilizer temperature of the current conveying stage to the stage target temperature; wherein the current conveying stage includes a fresh discharge stage, a transit storage stage, and a packaging stage.

[0006] In one possible implementation, the method further includes: obtaining the liquid fertilizer concentration; obtaining the temperature correction factor corresponding to preventing liquid fertilizer crystallization at the liquid fertilizer concentration; determining the product of the stage target temperature and the temperature correction factor as the stage adjustment temperature; determining the product of the stage adjustment temperature and the temperature comprehensive adjustment coefficient as the stage correction temperature; and adjusting the liquid fertilizer temperature in the current delivery stage to the stage correction temperature.

[0007] In another possible implementation, the method further includes: when the current conveying stage is the packaging stage, obtaining the storage tank volume for packaging liquid fertilizer, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer; determining the thermal inertia response time based on the storage tank volume, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer; and adjusting the temperature of the liquid fertilizer to the stage correction temperature corresponding to the packaging stage within the thermal inertia response time before the packaging stage.

[0008] In another possible implementation, the method further includes: obtaining the fertilizer pipeline pressure in the liquid fertilizer delivery pipeline during the current delivery stage; when the solubility of the liquid fertilizer increases with temperature and the fertilizer pipeline pressure is less than the preset fertilizer pipeline pressure, obtaining the preceding temperature correction factor corresponding to the previous delivery stage of the current delivery stage; and increasing the preset temperature correction factor by increasing the preceding temperature correction factor.

[0009] In another possible implementation, the method further includes: when the solubility of the liquid fertilizer increases with temperature and the fertilizer pipeline pressure is greater than or equal to a preset fertilizer pipeline pressure, obtaining a subsequent temperature correction factor corresponding to the next delivery stage of the current delivery stage; and increasing the preset temperature correction factor by increasing the subsequent temperature correction factor.

[0010] In another possible implementation, the method further includes: acquiring the real-time detected temperature, target detected temperature, and temperature deviation threshold of multiple temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage; determining the difference between the target detected temperature and the real-time detected temperature of the multiple temperature detection points as the real-time temperature deviation value; marking the temperature detection point as an abnormal temperature detection point when the real-time temperature deviation value of the temperature detection point is greater than or equal to the temperature deviation threshold; determining the real-time detected temperature amplitude and the real-time detected temperature average value of the multiple temperature detection points when the number of abnormal temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage is 0; determining the ratio of the real-time detected temperature amplitude to the real-time detected temperature average value as the temperature uniformity evaluation value of the liquid fertilizer conveying pipeline during the current conveying stage; determining that crystallization exists on the pipe wall of the liquid fertilizer conveying pipeline during the current conveying stage when the temperature uniformity evaluation value is less than the preset temperature uniformity evaluation value, increasing the preset temperature correction factor of the preceding temperature correction factor to eliminate the crystallization on the pipe wall of the liquid fertilizer conveying pipeline during the current conveying stage; wherein, the real-time detected temperature amplitude is the difference between the maximum and minimum real-time detected temperatures of the multiple temperature detection points.

[0011] In another possible implementation, the method further includes: when the number of abnormal temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage is not zero, determining the ratio of the number of abnormal temperature detection points to the number of temperature detection points within a unit time period as the temperature deviation frequency; determining the ratio of the number of abnormal temperature detection points to the number of temperature detection points across all time periods as the temperature deviation percentage; obtaining the upper limit values ​​of liquid fertilizer temperature corresponding to the two conveying stages preceding the current conveying stage; when the temperature deviation frequency is greater than or equal to the preset temperature deviation frequency, and the temperature deviation percentage is greater than or equal to the preset temperature deviation percentage, adjusting the liquid fertilizer temperature corresponding to the two conveying stages preceding the current conveying stage to the upper limit value of liquid fertilizer temperature.

[0012] In another possible implementation, the method further includes: adjusting the liquid fertilizer temperature corresponding to the two previous conveying stages to the upper limit of the liquid fertilizer temperature, obtaining the frequency of temperature deviation after adjusting to the upper limit of the liquid fertilizer temperature as the corrected temperature deviation frequency; obtaining the percentage of temperature deviation after adjusting to the upper limit of the liquid fertilizer temperature as the corrected temperature deviation percentage; and issuing a maintenance prompt message to prompt maintenance of the liquid fertilizer conveying pipeline in the current conveying stage when the corrected temperature deviation frequency is greater than or equal to the preset temperature deviation frequency and the corrected temperature deviation percentage is greater than or equal to the preset temperature deviation percentage.

[0013] In another possible implementation, the method further includes: when the solubility change of the liquid fertilizer with temperature is less than a preset solubility change value, and the liquid fertilizer is a high-temperature easily decomposed amino acid liquid fertilizer or humic acid liquid fertilizer, obtaining the upper limit value of the liquid fertilizer's transport temperature and the upper limit value of its packaging temperature; obtaining the storage tank volume for packaging the liquid fertilizer, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer; wherein, the upper limit value of the packaging temperature is less than the upper limit value of the transport temperature; during the transport stage before the packaging stage, controlling the liquid fertilizer temperature to be less than the upper limit value of the transport temperature; determining the thermal inertia response time based on the storage tank volume, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer; adjusting the liquid fertilizer temperature to be less than the upper limit value of the packaging temperature during the thermal inertia response time before the packaging stage, so as to reduce the energy consumption of the packaging process.

[0014] Secondly, embodiments of this application provide a packaging control system for liquid fertilizer production, including units for implementing the above-described method.

[0015] The beneficial effects of the embodiments in this application compared with the prior art are:

[0016] This application provides a packaging control method for liquid fertilizer production. The method includes: acquiring the liquid fertilizer temperature, workshop ambient temperature, and packaging queuing time in the liquid fertilizer production packaging; determining the deviation value between the workshop ambient temperature and a preset workshop ambient temperature as the ambient temperature deviation value; determining an ambient temperature compensation coefficient based on the ambient temperature deviation value; determining a waiting time compensation coefficient based on the packaging queuing time; determining the sum of the ambient temperature compensation coefficient and the waiting time compensation coefficient as a comprehensive temperature adjustment coefficient; acquiring the stage base temperature corresponding to the current conveying stage; determining the product of the stage base temperature and the comprehensive temperature adjustment coefficient as the stage target temperature; and adjusting the liquid fertilizer temperature in the current conveying stage to the stage target temperature; wherein the current conveying stage includes a fresh discharge stage, a transit storage stage, and a packaging stage. In this embodiment, the liquid fertilizer temperature, workshop ambient temperature, and packaging queuing time in the liquid fertilizer production and packaging process are collected. The deviation between the workshop ambient temperature and the preset workshop ambient temperature is calculated to obtain the ambient temperature deviation value, and the corresponding ambient temperature compensation coefficient is obtained. Combined with the packaging queuing time, the waiting time compensation coefficient is obtained. The sum of the two compensation coefficients is calculated to obtain the comprehensive temperature adjustment coefficient. The corresponding stage base temperature is matched for the fresh discharge stage, the transit storage stage, and the packaging stage. The stage base temperature and the comprehensive temperature adjustment coefficient are multiplied to obtain the stage target temperature for the corresponding stage. This can match differentiated temperature control standards for the characteristics of liquid fertilizer in different transportation stages, effectively reducing the fluctuation of fertilizer properties caused by uniform temperature control standards in different stages. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic flowchart of a first packaging control method for liquid fertilizer production provided in an embodiment of this application;

[0019] Figure 2 A schematic diagram of the workflow of the first packaging control method for liquid fertilizer production provided in the embodiments of this application;

[0020] Figure 3 A schematic flowchart of a second packaging control method for liquid fertilizer production provided in an embodiment of this application;

[0021] Figure 4 A schematic diagram of the workflow of a second packaging control method for liquid fertilizer production provided in an embodiment of this application;

[0022] Figure 5 A schematic flowchart of a third packaging control method for liquid fertilizer production provided in this application embodiment;

[0023] Figure 6 A schematic diagram of the workflow of a third packaging control method for liquid fertilizer production provided in this application embodiment;

[0024] Figure 7 A schematic flowchart of a fourth packaging control method for liquid fertilizer production provided in this application embodiment;

[0025] Figure 8 A schematic diagram of the workflow of the fourth packaging control method for liquid fertilizer production provided in the embodiments of this application;

[0026] Figure 9 A schematic flowchart of the fifth packaging control method for liquid fertilizer production provided in this application embodiment;

[0027] Figure 10 A schematic diagram of the workflow of the fifth packaging control method for liquid fertilizer production provided in the embodiments of this application;

[0028] Figure 11 A schematic flowchart of a sixth packaging control method for liquid fertilizer production provided in this application embodiment;

[0029] Figure 12A schematic diagram of the workflow of the sixth packaging control method for liquid fertilizer production provided in the embodiments of this application;

[0030] Figure 13 A schematic flowchart of the seventh packaging control method for liquid fertilizer production provided in the embodiments of this application;

[0031] Figure 14 A schematic flowchart of the eighth packaging control method for liquid fertilizer production provided in this application embodiment;

[0032] Figure 15 This is a schematic diagram of the logic structure of a packaging control system for liquid fertilizer production, provided as an embodiment of this application. Detailed Implementation

[0033] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0034] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0035] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0036] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0038] The multiple conveying stages in the liquid fertilizer packaging process cannot be automatically controlled, making it unsuitable for the highly automated and stable operation requirements of liquid fertilizer packaging production lines.

[0039] Based on the above reasons, this application provides a packaging control method for liquid fertilizer production. The method includes: acquiring the liquid fertilizer temperature, workshop ambient temperature, and packaging queuing time in the liquid fertilizer production packaging; determining the deviation value between the workshop ambient temperature and a preset workshop ambient temperature as the ambient temperature deviation value; determining an ambient temperature compensation coefficient based on the ambient temperature deviation value; determining a waiting time compensation coefficient based on the packaging queuing time; determining the sum of the ambient temperature compensation coefficient and the waiting time compensation coefficient as a comprehensive temperature adjustment coefficient; acquiring the stage base temperature corresponding to the current conveying stage; determining the product of the stage base temperature and the comprehensive temperature adjustment coefficient as the stage target temperature; and adjusting the liquid fertilizer temperature in the current conveying stage to the stage target temperature. The current conveying stage includes a fresh discharge stage, a transit storage stage, and a packaging stage. In this embodiment, the liquid fertilizer temperature, workshop ambient temperature, and packaging queuing time in the liquid fertilizer production and packaging process are collected. The deviation between the workshop ambient temperature and the preset workshop ambient temperature is calculated to obtain the ambient temperature deviation value, and the corresponding ambient temperature compensation coefficient is obtained. Combined with the packaging queuing time, the waiting time compensation coefficient is obtained. The sum of the two compensation coefficients is calculated to obtain the comprehensive temperature adjustment coefficient. The corresponding stage base temperature is matched for the fresh discharge stage, the transit storage stage, and the packaging stage. The stage base temperature and the comprehensive temperature adjustment coefficient are multiplied to obtain the stage target temperature for the corresponding stage. This can match differentiated temperature control standards for the characteristics of liquid fertilizer in different transportation stages, effectively reducing the fluctuation of fertilizer properties caused by uniform temperature control standards in different stages.

[0040] In some scenarios, the packaging control method for liquid fertilizer production according to an embodiment of this application can be applied to large-scale liquid fertilizer production lines, adapting to workshop temperature fluctuations in different seasons, avoiding problems such as liquid fertilizer stratification, bag bulging, or filling accuracy deviations, and ensuring the qualified rate of packaged finished products.

[0041] In other scenarios, the packaging control method for liquid fertilizer production according to the embodiments of this application can also be applied to multi-batch, small-volume customized fertilizer production scenarios, adapting to the differences in queuing time between different orders, flexibly adjusting the temperature at each stage, and improving the packaging quality stability of small-batch production.

[0042] The following describes in detail, with specific examples, a packaging control method for liquid fertilizer production provided in the embodiments of this application.

[0043] Figure 1 A schematic flowchart of a first packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 1 As shown in the embodiment of this application, a packaging control method for liquid fertilizer production is provided. The method includes steps S110 to S120, which are described in detail below.

[0044] S110. Obtain the liquid fertilizer temperature in the liquid fertilizer production packaging, the workshop ambient temperature, and the packaging queuing waiting time. Determine the deviation value between the workshop ambient temperature and the preset workshop ambient temperature as the ambient temperature deviation value. Determine the ambient temperature compensation coefficient based on the ambient temperature deviation value. Determine the waiting time compensation coefficient based on the packaging queuing waiting time. Determine the sum of S110, the ambient temperature compensation coefficient, and the waiting time compensation coefficient as the overall temperature adjustment coefficient.

[0045] Figure 2 A schematic diagram of the workflow of the first packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 2 As shown, in this implementation, temperature data of liquid fertilizer from production discharge to entry into the packaging station can be collected by sensor devices deployed at different nodes of the liquid fertilizer production and packaging line. At the same time, ambient temperature data in the packaging workshop can be collected, and the queuing waiting time of the packaging batch from completion of production discharge to entry into the filling station can also be recorded.

[0046] For example, temperature sensors can be installed on the buffer tanks for liquid fertilizer products, along the path from the conveying pipeline to the inlet of the packaging machine, to continuously collect the temperature of the liquid fertilizer. Ambient temperature sensors can be placed in different functional areas of the packaging workshop to obtain the ambient temperature. The central control system of the packaging line can automatically calculate batch queuing times.

[0047] For example, specific scenarios for measuring the temperature of liquid fertilizer during production and packaging include: measuring the temperature at the outlet of the storage tank when the liquid fertilizer is transferred from the reactor to the finished product storage tank; measuring the temperature in the middle section of the pipeline during the process of conveying the liquid fertilizer to the feeding hopper of the packaging machine; and measuring the temperature by installing a contact temperature sensor on the inner wall of the metering cup when the liquid fertilizer is injected into the metering cup of the packaging machine and is awaiting filling.

[0048] In this implementation, a preset workshop ambient temperature stored in the production control system can be obtained, and the difference between the real-time collected workshop ambient temperature and the preset value can be calculated to obtain the corresponding ambient temperature deviation value.

[0049] For example, the preset workshop ambient temperature can be stored in the parameter configuration module of the packaging line control system. After the control system retrieves the preset value, it subtracts the real-time collected workshop ambient temperature from the preset value, and the difference is the ambient temperature deviation value.

[0050] For example, common criteria for setting the preset workshop ambient temperature include: Based on the storage and transportation requirements of liquid fertilizer products, for room-temperature storage liquid fertilizers, the preset workshop ambient temperature can be set to a fixed value within the range of 20-25℃. Based on the average annual temperature of the workshop combined with seasonal adjustments, for production workshops in northern regions, the preset value is adjusted to 24℃ in summer and 22℃ in winter. Based on the process requirements for liquid fertilizer packaging, for liquid fertilizers containing humic acid, the ambient temperature during packaging must not be lower than 18℃, so the preset value can be set to 18℃.

[0051] In this implementation, the calculated ambient temperature deviation value can be mapped to a specific ambient temperature compensation coefficient according to the pre-set matching rules, and different deviation ranges correspond to different compensation coefficient values.

[0052] For example, different ambient temperature deviation ranges can be pre-defined, and each deviation range can be bound to a fixed ambient temperature compensation coefficient value. After calculating the ambient temperature deviation value, the corresponding ambient temperature compensation coefficient can be obtained by matching it to the corresponding range.

[0053] For example, when the ambient temperature deviation is greater than or equal to 5℃, the ambient temperature compensation coefficient is 0.3. When the ambient temperature deviation is greater than or equal to 0℃ and less than 5℃, the ambient temperature compensation coefficient is 0.15. When the ambient temperature deviation is greater than -5℃ and less than 0℃, the ambient temperature compensation coefficient is -0.15. When the ambient temperature deviation is less than or equal to -5℃, the ambient temperature compensation coefficient is -0.3.

[0054] In this implementation, the statistically obtained packaging queuing waiting time can be mapped to a specific waiting time compensation coefficient according to the pre-set matching rules, and different waiting time intervals correspond to different compensation coefficient values.

[0055] For example, different packaging queue waiting time intervals can be pre-divided, and each time interval can be bound to a fixed waiting time compensation coefficient value. After the waiting time is calculated, the corresponding waiting time compensation coefficient can be obtained by matching the corresponding interval.

[0056] For example, when the packaging queue waiting time is greater than or equal to 30 minutes, the waiting time compensation coefficient is 0.2. When the packaging queue waiting time is greater than or equal to 10 minutes and less than 30 minutes, the waiting time compensation coefficient is 0.1. When the packaging queue waiting time is greater than 0 minutes and less than 10 minutes, the waiting time compensation coefficient is 0.05. When the packaging queue waiting time is 0 minutes, i.e., the product directly enters the packaging station, the waiting time compensation coefficient is 0.

[0057] In this implementation, the original temperature of the collected liquid fertilizer can be corrected by considering the influence of ambient temperature and queuing time. The corrected temperature is used to adjust the filling parameters of the packaging. The basic parameter for correction is the temperature comprehensive adjustment coefficient, which is calculated by adding a fixed value of 1 to the already obtained ambient temperature compensation coefficient and waiting time compensation coefficient.

[0058] For example, by adding the three values ​​of 1, ambient temperature compensation coefficient, and waiting time compensation coefficient in sequence, the final sum is the comprehensive temperature adjustment coefficient.

[0059] For example, in a certain liquid fertilizer packaging production, the ambient temperature deviation was found to be 3℃, with an ambient temperature compensation coefficient of 0.15. The packaging queuing waiting time was found to be 15 minutes, with a waiting time compensation coefficient of 0.1. The overall temperature adjustment coefficient was 1 + 0.15 + 0.1 = 1.25.

[0060] In this implementation, the production control system can record time points and calculate the packaging queuing time for each batch of liquid fertilizer.

[0061] For example, a specific statistical method could be to record the time when all of a batch of liquid fertilizer is transported into the finished product storage tank to complete the preparation, and then record the time when the first packaging container of that batch begins filling. The difference between the two time points is calculated, and the result is the packaging queuing waiting time for that batch of liquid fertilizer. Through the queue management system of the packaging line, the time when each batch completes preparation and enters the queue sequence, and the time when that batch leaves the queue sequence to begin packaging are recorded sequentially. The difference between the two times is the packaging queuing waiting time.

[0062] S120. Obtain a stage base temperature corresponding to the current conveying stage. Determine the product of the stage base temperature and the comprehensive temperature adjustment coefficient as the stage target temperature. Adjust the temperature of the liquid fertilizer in the current conveying stage to the stage target temperature. The current conveying stage includes a fresh discharging stage, a transfer temporary storage stage, and a to-be-packaged stage.

[0063] In this implementation, the corresponding stage base temperature may be retrieved from a pre-configured parameter table according to the conveying stage where the current liquid fertilizer is located. Different conveying stages correspond to different stage base temperatures, and the current conveying stages are divided into three categories: the fresh discharging stage, the transfer temporary storage stage, and the to-be-packaged stage.

[0064] For example, the stage base temperature parameters corresponding to each conveying stage may be pre-stored in the central control system of the liquid fertilizer production and packaging line. After the liquid fertilizer enters a certain conveying stage, the central control system automatically identifies the stage type and retrieves the corresponding stage base temperature parameter.

[0065] Exemplarily, the stage base temperature of the fresh discharging stage is set according to the discharge temperature of the synthesis reaction, and maintaining the discharge temperature can prevent nutrient crystallization and precipitation during the cooling process. The stage base temperature of the transfer temporary storage stage is set according to the storage requirements for the product shelf life, taking into account both storage stability and subsequent temperature adjustment efficiency. The stage base temperature of the to-be-packaged stage is set according to the packaging process requirements, so as to ensure the fluidity and filling precision of the liquid fertilizer during filling.

[0066] In this implementation, the previously calculated comprehensive temperature adjustment coefficient may be retrieved, the stage base temperature and the comprehensive temperature adjustment coefficient are multiplied, and the obtained operation result is the stage target temperature that needs to be controlled and reached.

[0067] For example, the stage base temperature corresponding to the conveying stage is obtained first, then the comprehensive temperature adjustment coefficient is obtained, the two values are multiplied, and the final result is the stage target temperature of the conveying stage.

[0068] Exemplarily, a certain amino acid-containing liquid fertilizer is in the to-be-packaged stage, the corresponding stage base temperature is 20°C, the previously calculated comprehensive temperature adjustment coefficient is 1.25, and the calculation process of the stage target temperature is 20°C × 1.25 = 25°C.

[0069] In this implementation, the temperature of the liquid fertilizer in the current conveying stage may be adjusted to the calculated stage target temperature through the temperature control devices matching the conveying pipeline or the temporary storage equipment, and the types of temperature control devices in different conveying stages are different.

[0070] For example, for the pipeline conveying stage, the heating or cooling module wound on the outer wall of the pipeline may be started to adjust the temperature; for the temporary storage stage, the jacket temperature control system matching the temporary storage tank may be started to adjust the temperature.

[0071] For example, during the fresh discharge stage, the temperature of the liquid fertilizer can be adjusted to the target temperature by adjusting the flow rate of the cooling liquid in the cooling jacket after the reactor discharges. During the transfer and temporary storage stage, the temperature of the liquid fertilizer can be maintained at the target temperature by activating the heating system or ventilation and cooling system of the temporary storage tank. During the packaging stage, the temperature control sleeve power of the conveying pipeline can be adjusted to stabilize the temperature of the liquid fertilizer entering the packaging machine at the target temperature.

[0072] In this implementation, the scene boundaries of different transportation stages can be defined according to the movement sequence of liquid fertilizer from the completion of synthesis to the entry into the packaging station, and the start and end range of each stage can be clearly defined.

[0073] For example, the scene boundaries of different conveying stages can be divided according to the equipment and location of the liquid fertilizer, so that the central control system can automatically identify the current conveying stage.

[0074] For example, the boundary of the fresh discharge stage is from the discharge port of the reactor to the inlet of the finished product transfer storage tank. The boundary of the transfer storage stage is from the inlet of the transfer storage tank to the discharge from the transfer storage tank into the packaging conveying pipeline. The boundary of the packaging stage is from the discharge from the transfer storage tank into the packaging conveying pipeline to the liquid fertilizer entering the metering cup of the packaging machine.

[0075] This implementation method collects the liquid fertilizer temperature, workshop ambient temperature, and packaging queuing time in the liquid fertilizer production packaging. It calculates the deviation between the workshop ambient temperature and the preset workshop ambient temperature to obtain the ambient temperature deviation value, and obtains the corresponding ambient temperature compensation coefficient. Combined with the packaging queuing time, it obtains the waiting time compensation coefficient. The sum of the first and second compensation coefficients is calculated to obtain the comprehensive temperature adjustment coefficient. This allows the temperature adjustment parameters to match the actual scenarios of environmental fluctuations and queuing, avoiding the problem of insufficient adaptability of fixed temperature control parameters.

[0076] This implementation method matches the base temperature for each of the fresh discharge stage, the transit and temporary storage stage, and the packaging stage. The target temperature for the corresponding stage is obtained by multiplying the base temperature of the stage and the comprehensive temperature adjustment coefficient. This allows for the matching of differentiated temperature control standards for the characteristics of liquid fertilizer at different transportation stages, effectively reducing the fluctuations in fertilizer properties caused by uniform temperature control standards at different stages.

[0077] By adjusting the temperature of the liquid fertilizer in each current conveying stage to the corresponding target temperature, the liquid fertilizer can maintain a uniform and stable flow state before filling, avoiding filling volume errors caused by viscosity changes due to unsuitable temperature, while reducing the probability of stratification and sedimentation of fertilizer in the bottle after packaging, and improving the qualified rate of packaged liquid fertilizer products.

[0078] Figure 3 A schematic flowchart of a second packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 3 As shown, in some implementations, the above method also includes S130 to S140, which will be described in detail below.

[0079] S130. Obtain the liquid fertilizer concentration. Obtain the temperature correction factor corresponding to the liquid fertilizer concentration that prevents crystallization.

[0080] Figure 4 A schematic diagram of the workflow of the second packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 4 As shown, in this implementation, the real-time concentration data of liquid fertilizer during the production process can be directly collected by a detection device installed on the delivery pipeline or temporary storage equipment, providing basic parameters for subsequent temperature correction.

[0081] For example, an online refractometer can be installed on the delivery pipeline to calculate the real-time concentration of the liquid fertilizer by measuring the refractive index of the liquid. Alternatively, a densitometer can be used to measure the density of the liquid fertilizer, and the concentration can be calculated by combining the correlation between the product concentration and density. Alternatively, samples can be taken manually, and the concentration can be tested by laboratory titration, with the results then entered into the central control system.

[0082] In this implementation, the correspondence between different liquid fertilizer concentrations and anti-crystallization temperature correction factors can be pre-stored, and the corresponding temperature correction factor can be obtained based on the detected liquid fertilizer concentration.

[0083] For example, the central control system stores a pre-configured correspondence table. After obtaining the concentration of liquid fertilizer, the corresponding temperature correction factor can be obtained by matching the corresponding concentration range.

[0084] For example, the matching rule for the temperature correction factor to prevent crystallization corresponding to different liquid fertilizer concentrations can be as follows: when the total concentration of macroelements in the liquid fertilizer is less than 30%, the temperature correction factor is 0.95. When the total concentration is greater than or equal to 30% and less than 40%, the temperature correction factor is 1.0. When the total concentration is greater than or equal to 40% and less than 50%, the temperature correction factor is 1.05. When the total concentration is greater than or equal to 50%, the temperature correction factor is 1.1.

[0085] S140. Determine the product of the stage base temperature and the temperature correction factor as the stage adjustment temperature; determine the product of the stage adjustment temperature and the comprehensive temperature adjustment coefficient as the stage correction temperature; adjust the liquid fertilizer temperature of the current transportation stage to the stage correction temperature.

[0086] In this implementation, the pre-set stage base temperature for the corresponding delivery stage can be retrieved, and the temperature correction factor obtained by matching the liquid fertilizer concentration can be retrieved. The two values ​​are multiplied together to obtain the stage adjustment temperature after correction for concentration influence.

[0087] For example, the basic temperature of the corresponding delivery stage can be extracted from the parameter library of the central control system, and then the temperature correction factor corresponding to the current concentration can be extracted. The result can be obtained by directly performing a multiplication operation.

[0088] For example, the base temperature of a certain liquid fertilizer in the packaging stage is 20℃, the temperature correction factor obtained by matching the detected liquid fertilizer concentration is 1.05, and the specific calculation process of adjusting the stage temperature is 20℃×1.05=21℃.

[0089] In this implementation, the stage adjustment temperature obtained earlier can be combined with the influence of the environment and queuing to calculate the final stage correction temperature that needs to be controlled. The stage adjustment temperature and the temperature comprehensive adjustment coefficient are multiplied to obtain the stage correction temperature, which is the temperature result after concentration correction.

[0090] For example, the temperature obtained after concentration correction is used as the stage adjustment temperature, and the previously calculated comprehensive temperature adjustment coefficient is retrieved and multiplied to obtain the stage correction temperature.

[0091] For example, the stage adjustment temperature of a certain batch of liquid fertilizer is 21℃, the previously calculated comprehensive temperature adjustment coefficient is 1.25, and the specific calculation process of the stage correction temperature is 21℃×1.25=26.25℃.

[0092] In this implementation, the current transportation stage of the liquid fertilizer can be identified, the corresponding temperature control device can be activated, and the real-time temperature of the liquid fertilizer can be adjusted to the calculated stage correction temperature to complete the temperature control of that stage.

[0093] For example, the central control system sends the stage correction temperature to the temperature control execution module of the corresponding delivery stage, and the temperature control module starts the heating or cooling operation until the real-time temperature of the liquid fertilizer reaches the stage correction temperature.

[0094] For example, the central control system first collects the real-time temperature of the liquid fertilizer and compares it with the calculated stage correction temperature. If the real-time temperature is lower than the stage correction temperature, the heating device for the corresponding stage is activated, and heating continues until the real-time temperature reaches the required level. If the real-time temperature is higher than the stage correction temperature, the cooling device is activated, and cooling continues until the real-time temperature reaches the required level. After the temperature reaches the target level, the temperature control output is maintained to keep the temperature stable until the batch is completely transported.

[0095] This implementation method obtains the liquid fertilizer concentration, matches the corresponding liquid fertilizer concentration with a temperature correction factor to prevent liquid fertilizer crystallization, and obtains the stage adjustment temperature by multiplying the stage base temperature and the temperature correction factor. This method can adapt to the crystallization characteristics of different fertilizer concentrations and avoid the impact of high-concentration fertilizer crystallization at low temperatures on the properties.

[0096] This method multiplies the stage concentration correction temperature and the overall temperature adjustment coefficient to obtain the stage correction temperature. It can take into account the dynamic effects of ambient temperature and queuing time, and cover the concentration requirements for crystallization temperature, making the temperature control parameters more comprehensive. Adjusting the temperature of the liquid fertilizer in the current transportation stage to the stage correction temperature can further reduce the probability of liquid fertilizer crystallization under different working conditions, ensure the uniformity of fertilizer state during filling, and improve the quality stability of the final packaged product.

[0097] Figure 5 A schematic flowchart of a third packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 5 As shown, in some implementations, the above method also includes S150 to S160, which will be described in detail below.

[0098] S150. When the current conveying stage is the packaging stage, obtain the storage tank volume of the liquid fertilizer packaging, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer.

[0099] Figure 6 A schematic diagram of the workflow of the third packaging control method for liquid fertilizer production provided in the embodiments of this application is shown below. Figure 6 As shown in this implementation, the current conveying stage is first identified as the packaging stage. After confirming that it is in the packaging stage, the volume of the storage tank used for temporary storage of liquid fertilizer, the temperature difference between the inside and outside workshop environment of the storage tank, and the specific heat capacity of the current batch of liquid fertilizer are obtained respectively, so as to provide parameters for further temperature correction.

[0100] For example, the rated volume parameters of the corresponding storage tank can be directly retrieved from the production equipment ledger, entered into the central control system, and then directly obtained. The actual volume of liquid fertilizer currently loaded into the storage tank can be calculated using the inlet flow meter of the storage tank to obtain the actual volume of the storage tank in use. For standardized storage tanks of fixed specifications, the volume parameters can be pre-stored in the central control system and retrieved directly when needed.

[0101] In this implementation, the liquid temperature inside the storage tank and the ambient temperature of the workshop outside the storage tank can be collected separately, and the difference between the two temperatures can be calculated to obtain the temperature difference between the inside and outside of the storage tank.

[0102] For example, a temperature sensor is installed inside the storage tank to collect the internal liquid temperature, and an ambient temperature sensor is installed 1 meter away from the tank wall to collect the external temperature. The difference between the two temperatures is then calculated to obtain the result.

[0103] In this implementation, the corresponding specific heat capacity parameter can be obtained according to the type and formula of the current liquid fertilizer to meet the parameter requirements for subsequent heat loss calculation.

[0104] For example, for pre-produced liquid fertilizer products, the specific heat capacity is measured in advance using instruments, and the parameters are stored in the formula library of the central control system. During production, the formula is directly matched and retrieved. For liquid fertilizers with customized formulas, the specific heat capacity of the sample can be measured using a differential scanning calorimeter, and the measurement results can be entered into the central control system for retrieval.

[0105] S160. Determine the thermal inertia response time based on the storage tank volume, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer. Adjust the liquid fertilizer temperature to the corresponding stage correction temperature within the thermal inertia response time before the packaging stage.

[0106] In this implementation, the thermal inertia response time under the corresponding conditions can be calculated or matched by combining the obtained storage tank volume, the temperature difference between the inside and outside of the storage tank and the specific heat capacity of the liquid fertilizer. The thermal inertia response time is the advance adjustment time required to adjust the temperature of the liquid fertilizer in the storage tank to the target value.

[0107] For example, an empirical value table can be pre-established, containing different storage tank volume ranges, different temperature difference ranges between the inside and outside of the storage tank, and different specific heat capacity ranges of liquid fertilizer. Each parameter range combination corresponds to a fixed empirical value for thermal inertia response time, and the corresponding value can be directly retrieved after matching the parameters. When the storage tank volume is 5-10 cubic meters, the temperature difference between the inside and outside of the storage tank is 3-6℃, and the specific heat capacity of the liquid fertilizer is 3-4 kJ / (kg·℃), the corresponding thermal inertia response time is 30 minutes.

[0108] In this implementation, the time node for initiating temperature adjustment can be deduced by combining the expected start time of the packaging stage with the obtained thermal inertia response time, and the temperature adjustment operation can be initiated in advance.

[0109] For example, based on the production schedule, it is known that the packaging stage of a certain batch of liquid fertilizer will begin at 10:00 AM on the same day. The thermal inertia response time is calculated to be 30 minutes. The time node for starting temperature adjustment is determined to be 9:30 AM on the same day, and the temperature adjustment operation is started in advance at this time node.

[0110] In this implementation, the temperature control power can be adjusted in stages within a defined thermal inertia response time range, gradually adjusting the temperature of the liquid fertilizer to the stage correction temperature corresponding to the packaging stage, ensuring that the temperature adjustment is in place and that over-adjustment does not occur.

[0111] For example, the thermal inertia response time is 30 minutes, the target stage correction temperature is 26°C, and the current liquid fertilizer temperature is 20°C. The execution rhythm is as follows: for the first 15 minutes, the storage tank heating is turned on at full power to raise the temperature to about 25°C. For the next 15 minutes, the heating power is reduced to 30% of the rated power, maintaining a slow temperature rise until the temperature stabilizes at the stage correction temperature of 26°C.

[0112] With this implementation method, when the current conveying stage is the packaging stage, the storage tank volume of the liquid fertilizer packaging, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer are obtained first. The thermal inertia response time is calculated by combining the three types of parameters, which can accurately predict the lead time of temperature adjustment and avoid the temperature control lagging behind the switching of the conveying stage.

[0113] This method initiates temperature adjustment within the thermal inertia response time before the packaging stage, ensuring that the liquid fertilizer temperature is adjusted to the corrected temperature for the packaging stage just before it enters the packaging stage. This eliminates the lag deviation in temperature control and ensures that the temperature remains stable and meets the standards during the packaging stage. It further avoids the problem of the liquid fertilizer not meeting the standards after entering the packaging stage, reduces the fluctuation of fertilizer properties due to unsuitable temperature during filling, and effectively improves the quality consistency of the final packaged liquid fertilizer.

[0114] Figure 7 A schematic flowchart of the fourth packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 7 As shown, in some implementations, the above method also includes S170 to S180, which will be described in detail below.

[0115] S170. Obtain the pressure of the fertilizer pipeline in the liquid fertilizer delivery pipeline during the current delivery stage.

[0116] Figure 8 A schematic diagram of the workflow of the fourth packaging control method for liquid fertilizer production provided in the embodiments of this application is shown below. Figure 8 As shown in this implementation, a pressure detection device can be installed on the liquid fertilizer conveying pipeline during the current conveying stage to collect fertilizer pipeline pressure data in real time, providing a basis for subsequent conveying parameter adjustments.

[0117] For example, the specific location for detecting the fertilizer pipeline pressure within the liquid fertilizer conveying pipeline can be the straight section of the conveying pipeline before the packaging machine's inlet valve during the packaging stage, avoiding bends and valve locations to reduce detection errors. The middle straight section of the transfer conveying pipeline is located between the upstream temporary storage tank's outlet valve and the downstream packaging storage tank's inlet valve. Detection points are set at the starting and ending points of the long-distance conveying pipeline to simultaneously obtain the fertilizer pipeline pressure at both points.

[0118] For example, pressure can be directly detected by a piezoelectric pressure sensor installed on the pipeline, and the pressure value can be transmitted to the central control system in real time. The fertilizer pipeline pressure is calculated by detecting the outlet power of the delivery pump and combining the correspondence between the delivery pump power and the pipeline pressure. The pressure value is manually read periodically through the pressure gauge installed in the pipeline and entered into the central control system.

[0119] S180. When the solubility of liquid fertilizer increases with temperature, and the fertilizer pipeline pressure is less than the preset fertilizer pipeline pressure, obtain the preceding temperature correction factor corresponding to the previous transportation stage of the current transportation stage. Increase the preset temperature correction factor by increasing the preceding temperature correction factor.

[0120] In this implementation, the solubility change characteristics of the current liquid fertilizer are confirmed, and the detected fertilizer pipeline pressure is compared with the preset value. When the fertilizer pipeline pressure is less than the preset fertilizer pipeline pressure, it indicates that the fertilizer pipeline in the previous delivery stage may have caused the fertilizer pipeline pressure in the current delivery stage to drop due to crystallization. The crystallization in the liquid fertilizer pipeline in the previous delivery stage can be eliminated.

[0121] For example, the preset fertilizer pipeline pressure can be set based on the inner diameter of the delivery pipeline and the rated flow rate of the delivery pump, ensuring that the minimum pressure required to achieve the flow rate target is used as the preset value. Alternatively, it can be set based on the viscosity of the liquid fertilizer; higher viscosity liquid fertilizers require higher minimum delivery pressures, and correspondingly, higher preset fertilizer pipeline pressures. It can also be set based on the filling accuracy requirements of the packaging machine; higher filling accuracy requirements necessitate higher preset fertilizer pipeline pressure settings.

[0122] In this implementation, the corresponding previous conveying stage is determined according to the current conveying stage sequence, and the preceding temperature correction factor that has been generated and used in the previous conveying stage is retrieved from the parameter storage module of the central control system.

[0123] For example, if the current conveying stage is the packaging stage, the temperature correction factor parameter of the previous conveying stage (i.e., the transit / storage stage) is retrieved from the production parameter log of the central control system, and the corresponding preceding temperature correction factor is directly extracted and read. If the current stage is the transit / storage stage, the temperature correction factor stored in the fresh material discharge stage is retrieved, and the preceding temperature correction factor is extracted.

[0124] In this implementation, the obtained preceding temperature correction factor is added to a fixed value of the preset temperature correction factor increment to obtain a new temperature correction factor after correction and increase, which is used to adjust the temperature control parameters of subsequent batches in the previous stage.

[0125] For example, if the current preceding temperature correction factor is 1.05 and the system preset temperature correction factor increment is 0.05, the calculation process of the increased preceding temperature correction factor is 1.05 + 0.05 = 1.1.

[0126] This implementation method obtains the fertilizer pipeline pressure in the liquid fertilizer delivery pipeline during the current delivery stage. When it is determined that the solubility of the liquid fertilizer increases with temperature and the fertilizer pipeline pressure is less than the preset fertilizer pipeline pressure, it indicates that the fertilizer pipeline in the previous delivery stage may have caused the fertilizer pipeline pressure in the current delivery stage to drop due to crystallization. The crystallization in the liquid fertilizer delivery pipeline in the previous delivery stage can be eliminated.

[0127] By increasing the pre-set temperature correction factor, the temperature control threshold of the corresponding stage can be specifically improved. The solubility of the solute increases with temperature, which promotes the full dissolution of the solute and avoids crystallization that would affect the conveying pressure in the liquid fertilizer pipeline. This can further ensure the uniformity of the liquid fertilizer during the conveying process, reduce the probability of residual crystals clogging the pipeline, stabilize the properties of the fertilizer to be packaged, and improve the qualification rate of the final packaged product.

[0128] In some implementations, the above method further includes: when the solubility of the liquid fertilizer increases with temperature and the fertilizer pipeline pressure is greater than or equal to a preset fertilizer pipeline pressure, obtaining the subsequent temperature correction factor corresponding to the next delivery stage of the current delivery stage. The preset temperature correction factor is then increased by the subsequent temperature correction factor.

[0129] In this implementation, the solubility of liquid fertilizer increases with temperature. Then, the detected fertilizer pipeline pressure is compared with the preset fertilizer pipeline pressure. If the pressure is greater than or equal to the preset value, it indicates that crystallization may occur on the pipeline in the next delivery stage, causing the pipeline pressure in the current delivery stage to increase. The subsequent temperature correction factor pre-configured for the next delivery stage can be retrieved.

[0130] For example, if the current stage is fresh material discharge and conveying, and it is confirmed that the product solubility increases with temperature and the fertilizer pipeline pressure meets the standard, the next conveying stage is determined to be the transfer and temporary storage stage, and the temperature correction factor pre-configured for this stage is retrieved as the subsequent temperature correction factor.

[0131] For example, if the current conveying stage is the fresh material discharge stage, the next conveying stage is matched to a transfer and storage stage in the parameter configuration table of the central control system. The temperature correction factor pre-configured for the transfer and storage stage is directly retrieved to obtain the subsequent temperature correction factor. If the current conveying stage is the transfer and storage stage and the next conveying stage is the packaging stage, the pre-configured temperature correction factor for the packaging stage is directly retrieved to obtain the subsequent temperature correction factor.

[0132] In this implementation, the retrieved subsequent temperature correction factor is added to a fixed preset temperature correction factor increment to obtain an increased new subsequent temperature correction factor, which updates the temperature correction parameters for the next delivery stage and is used for subsequent temperature calculations.

[0133] For example, the original value of the currently retrieved subsequent temperature correction factor is 1.0, and the system preset temperature correction factor increment is 0.03. The calculation process of the increased subsequent temperature correction factor is 1.0 + 0.03 = 1.03, so as to increase the liquid fertilizer conveying temperature in the next conveying stage and avoid the liquid fertilizer in the next conveying stage from crystallizing on the inner wall of the pipeline.

[0134] By using this implementation method, when it is determined that the solubility of liquid fertilizer increases with temperature and the fertilizer pipeline pressure is greater than or equal to the preset fertilizer pipeline pressure, the subsequent temperature correction factor corresponding to the next delivery stage of the current delivery stage is obtained. This indicates that crystallization may occur on the pipeline in the next delivery stage, causing the pipeline pressure of the current delivery stage to increase. The subsequent temperature correction factor pre-configured for the next delivery stage can be retrieved and increased to eliminate the increase in pipeline pressure caused by crystallization on the inner wall of the pipeline.

[0135] By increasing the preset temperature correction factor of the subsequent temperature correction factor, a margin can be reserved in advance for the temperature control of the next stage. Combined with the change characteristics of solubility under high pressure, the dissolution effect is enhanced, and the risk of solute precipitation under high pressure is reduced. It can realize adaptive temperature adjustment under different pressure conditions, further ensure the uniformity of liquid fertilizer in the entire transportation process, reduce the probability of pipeline blockage, and improve the quality stability of the final packaged product.

[0136] Figure 9 A schematic flowchart of the fifth packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 9 As shown, in some implementations, the above method also includes S210 to S220, which will be described in detail below.

[0137] S210. Obtain the real-time detected temperature, target detected temperature, and temperature deviation threshold of multiple temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage. Determine the difference between the target detected temperature and the real-time detected temperature at multiple temperature detection points as the real-time temperature deviation value. When the real-time temperature deviation value of a temperature detection point is greater than or equal to the temperature deviation threshold, mark the temperature detection point as an abnormal temperature detection point.

[0138] Figure 10 A schematic diagram of the workflow of the fifth packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 10 As shown, in this implementation, three types of parameters can be collected for all temperature detection points that have been deployed in the liquid fertilizer conveying pipeline during the current conveying stage: the real-time temperature detected, the target detection temperature that the point needs to reach, and the maximum allowable deviation threshold, so as to provide basic data for subsequent anomaly judgment.

[0139] For example, the specific locations of temperature detection points on a liquid fertilizer conveying pipeline can be as follows: detection points can be placed at the inlet end of the pipeline to detect the initial temperature of the liquid fertilizer entering the pipeline; detection points can be placed at the outlet end of the pipeline to detect the final temperature of the liquid fertilizer flowing out of the pipeline; or detection points can be placed in the middle of the temperature-controlled section of the pipeline to detect the intermediate temperature of the liquid fertilizer during the temperature control process. For long-distance conveying pipelines, temperature detection points can be placed at fixed intervals.

[0140] In this implementation, for each temperature detection point, the difference between the target detection temperature and the real-time detection temperature is calculated to obtain the real-time temperature deviation value of that detection point. The absolute value of the deviation value reflects the degree to which the actual temperature deviates from the target.

[0141] For example, for a specific temperature detection point, the target detection temperature value at that point is taken out, and the currently collected real-time detection temperature value is taken out. The result of the subtraction operation is the real-time temperature deviation value.

[0142] For example, the target temperature for the temperature detection point at the feed end of the current conveying pipeline is set to the final stage correction temperature of the previous conveying stage. The target temperature for the temperature detection point at the discharge end of the current conveying pipeline is set to the final stage correction temperature of the current conveying stage. The target temperature for the temperature detection point in the middle of the temperature control section is set to the average of the current stage correction temperature and the previous stage correction temperature.

[0143] For example, the temperature deviation threshold can be set based on the detection accuracy of the temperature sensor; the lower the detection accuracy, the larger the set value of the temperature deviation threshold. Alternatively, it can be set based on the sensitivity of the liquid fertilizer crystallization to temperature deviation; the more sensitive it is to temperature deviation, the smaller the set value of the temperature deviation threshold. Or, it can be set based on the length of the conveying pipeline; the longer the conveying pipeline, the greater the fluctuation in heat loss, and the larger the set value of the temperature deviation threshold.

[0144] For example, the target detection temperature corresponding to a certain temperature detection point is 26℃, and the currently acquired real-time detection temperature is 23℃. The calculation process of the real-time temperature deviation value is 26℃-23℃=3℃, and the real-time temperature deviation value of the detection point is 3℃.

[0145] In this implementation, the real-time temperature deviation value of each temperature detection point is compared with the corresponding temperature deviation threshold. Detection points that meet the judgment conditions are marked as abnormal temperature detection points, which facilitates the subsequent triggering of the abnormal handling process.

[0146] For example, the real-time temperature deviation value and the corresponding temperature deviation threshold of each temperature detection point are read sequentially, and the two values ​​are compared. When the real-time temperature deviation value is greater than or equal to the temperature deviation threshold, the status mark of the temperature detection point is changed to an abnormal temperature detection point. When the real-time temperature deviation value is less than the temperature deviation threshold, the normal status mark is retained. The process ends after all detection points are judged.

[0147] S220. When the number of abnormal temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage is 0, determine the real-time detected temperature amplitude and the average real-time detected temperature of multiple temperature detection points. Determine the ratio of the real-time detected temperature amplitude to the average real-time detected temperature as the temperature uniformity assessment value of the liquid fertilizer conveying pipeline during the current conveying stage. When the temperature uniformity assessment value is less than the preset temperature uniformity assessment value, it is determined that crystallization exists on the pipe wall of the liquid fertilizer conveying pipeline during the current conveying stage. The preset temperature correction factor is then increased to eliminate the crystallization on the pipe wall of the liquid fertilizer conveying pipeline during the current conveying stage. The real-time detected temperature amplitude is the difference between the maximum and minimum real-time detected temperatures of the multiple temperature detection points.

[0148] In this implementation, the number of abnormal temperature detection points on the liquid fertilizer conveying pipeline in the current conveying stage is first counted. After confirming that the number is 0, the real-time detection temperature of all normal detection points is extracted. The real-time detection temperature amplitude and the average real-time detection temperature of all detection points are calculated respectively. The real-time detection temperature amplitude is the difference between the maximum real-time detection temperature and the minimum real-time detection temperature.

[0149] For example, a certain pipeline has 4 temperature detection points, and the real-time detected temperatures are 25℃, 26℃, 24℃ and 27℃ respectively. First, find that the maximum real-time detected temperature is 27℃ and the minimum real-time detected temperature is 24℃. The calculation process of the real-time detected temperature amplitude is 27℃-24℃=3℃.

[0150] For example, following the above example, the real-time detected temperatures of the four temperature detection points are 25℃, 26℃, 24℃, and 27℃, respectively. The calculation process of the average real-time detected temperature is (25+26+24+27) / 4=25.5℃.

[0151] In this implementation, the calculated real-time detected temperature amplitude is divided by the real-time detected average temperature, and the resulting ratio is the temperature uniformity assessment value of the liquid fertilizer conveying pipeline in the current conveying stage, which is used to assess the uniformity of temperature distribution within the pipeline.

[0152] For example, take the calculated real-time detected temperature amplitude and the calculated real-time detected temperature average, perform a division operation to obtain the result, which is the temperature uniformity evaluation value.

[0153] For example, based on the above calculation results, the real-time temperature amplitude is 3℃, the real-time temperature average is 25.5℃, and the calculation process of the temperature uniformity evaluation value is 3÷25.5≈0.118.

[0154] In this implementation, the calculated temperature uniformity evaluation value is compared with the preset temperature uniformity evaluation value. If the judgment condition is met, the crystallization process is triggered. The overall temperature is increased by adjusting the preceding temperature correction factor, which melts the crystals attached to the pipe wall.

[0155] For example, a smaller temperature uniformity assessment value indicates that the temperature distribution deviation exceeds the reasonable range, which corresponds to the determination that there is crystallization on the pipe wall and triggers a temperature correction operation.

[0156] For example, the setting can be based on the concentration of the liquid fertilizer; the higher the concentration, the smaller the allowable temperature uniformity deviation, and the smaller the preset temperature uniformity evaluation value. Alternatively, it can be based on the diameter of the delivery pipeline; the larger the diameter, the greater the temperature distribution deviation range, and the larger the preset temperature uniformity evaluation value. It can also be based on the degree of impact of crystallization on delivery; the more easily crystallization clogs the pipeline, the smaller the preset temperature uniformity evaluation value.

[0157] For example, the temperature uniformity assessment value reflects the degree of unevenness in temperature distribution. The smaller the value, the better the overall temperature uniformity. When the temperature uniformity assessment value is less than the preset value, it indicates that the actual temperature unevenness has exceeded the allowable reasonable range, and it is determined that crystals exist on the pipe wall. When the temperature uniformity assessment value is greater than or equal to the preset value, it indicates that the temperature unevenness is within the allowable range, and it is determined that no crystals exist.

[0158] For example, the solubility of crystals on the pipe wall increases as the temperature rises, causing them to melt and fall off. By increasing the preset temperature correction factor of the preceding temperature correction factor, the target temperature of the preceding transportation stage will rise accordingly. The initial temperature of the liquid fertilizer entering the current transportation pipeline will increase, and the overall pipeline temperature will rise accordingly. The gradually increasing temperature can melt the crystals attached to the pipe wall, thereby eliminating the crystals.

[0159] This implementation method obtains the real-time detected temperature, target detected temperature, and temperature deviation threshold of multiple temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage. The difference between the target detected temperature and the real-time detected temperature is calculated as the real-time temperature deviation value. Points with deviations exceeding the threshold are marked as abnormal temperature detection points. This method can quickly identify abnormal faults in pipeline temperature measurement nodes and avoid temperature measurement errors interfering with temperature control judgment.

[0160] This implementation method calculates the ratio of the real-time detected temperature amplitude to the real-time detected temperature average value of multiple temperature detection points when the number of abnormal temperature detection points is 0. This yields a temperature uniformity assessment value, which can accurately determine the uniformity of temperature distribution within the pipeline and provide a reliable basis for crystallization judgment. When the temperature uniformity assessment value is less than the preset temperature uniformity assessment value, it is determined that crystallization exists in the pipe wall. Increasing the preceding temperature correction factor can dissolve the crystallization in the pipe wall by raising the temperature, avoiding the accumulation of crystals that block the pipeline and ensuring a stable and smooth transportation process.

[0161] Figure 11 A schematic flowchart of the sixth packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 11 As shown, in some implementations, the above method also includes S230 to S240, which will be described in detail below.

[0162] S230. When the number of abnormal temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage is not zero, determine the ratio of the number of abnormal temperature detection points to the number of temperature detection points within a unit time period, as the temperature deviation frequency. Determine the ratio of the number of abnormal temperature detection points to the number of temperature detection points across all time periods, as the temperature deviation percentage. Obtain the upper limit value of the liquid fertilizer temperature corresponding to the two conveying stages preceding the current conveying stage.

[0163] Figure 12A schematic diagram of the workflow of the sixth packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 12 As shown in this implementation, when the number of abnormal temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage is not zero, abnormal data is collected according to a predefined unit time period, the frequency of temperature deviation within the unit time period is calculated, and the proportion of temperature deviation in all time periods is then calculated to provide data support for subsequent analysis of abnormal causes.

[0164] For example, the production operation time can be divided into continuous unit time periods. The proportion of abnormal points in each time period can be calculated to obtain the frequency of temperature deviation. The abnormal data of all time periods can be summarized to obtain the overall temperature deviation proportion.

[0165] For example, the continuous production time can be divided into 15-minute intervals based on a fixed duration. Alternatively, it can be divided by production batch, with the production time of each batch defined as a unit time interval. Or, it can be divided by delivery batch, with the delivery time of each batch of liquid fertilizer defined as a unit time interval.

[0166] For example, there are 8 temperature detection points in a certain time period. The number of abnormal temperature detection points in this time period is 2. The calculation process of temperature deviation frequency is 2÷8=0.25, and the temperature deviation frequency in this time period is 0.25.

[0167] In this implementation, the total number of abnormal temperature detection points and the total number of all temperature detection points within all statistical time periods are summarized, and the ratio of the two is calculated to obtain the temperature deviation percentage, reflecting the overall temperature abnormality percentage in the current transportation stage.

[0168] For example, the total number of abnormal temperature detection points is obtained by adding up the number of abnormal temperature detection points in all unit time periods, and the total number of detection points is obtained by adding up the number of temperature detection points in all unit time periods. The percentage of temperature deviation is obtained by performing a division operation.

[0169] For example, statistics show that the total number of abnormal temperature detection points is 4 and the total number of temperature detection points is 32 within all 4 time periods. The calculation process for the temperature deviation ratio is 4 ÷ 32 = 0.125, which gives a temperature deviation ratio of 0.125.

[0170] In this implementation, the two immediately preceding transport stages are identified according to the order of the transport stages, and the upper limit value of the liquid fertilizer temperature preset for each transport stage is retrieved to provide parameter constraints for subsequent temperature adjustments.

[0171] For example, if the current conveying stage is the packaging stage, find the previous transit and storage stage and the fresh discharge stage in sequence, and retrieve the upper limit value of liquid fertilizer temperature for each of the two stages.

[0172] For example, if the current conveying stage is the packaging stage, the two immediately preceding conveying stages are found in the production parameter log of the central control system according to the conveying sequence. These are the transit and storage stage and the fresh discharge stage. The upper limit values ​​of the liquid fertilizer temperature corresponding to these two stages are directly retrieved from the parameter configuration library. If the current conveying stage is the transit and storage stage, the upper limit values ​​of the temperature for the fresh discharge stage and the synthesis reaction stage are found and retrieved.

[0173] S240. When the frequency of temperature deviation is greater than or equal to the preset frequency of temperature deviation, and the proportion of temperature deviation is greater than or equal to the preset proportion of temperature deviation, the liquid fertilizer temperature corresponding to the two conveying stages before the current conveying stage is adjusted to the upper limit of the liquid fertilizer temperature.

[0174] In this implementation, the calculated temperature deviation frequency is compared with the preset temperature deviation frequency, and the temperature deviation percentage is compared with the preset temperature deviation percentage. When both conditions are met, the temperature adjustment operation of the first two conveying stages is triggered, and the liquid fertilizer temperature of the two conveying stages is adjusted to the upper limit value of the liquid fertilizer temperature of the corresponding stage.

[0175] For example, the central control system compares the two parameters in turn, and after confirming that the conditions are met at the same time, it sends adjustment instructions to the temperature control modules of the two preceding delivery stages to raise the temperature to their respective upper temperature limits.

[0176] For example, the preset temperature deviation frequency can be set based on the crystallization sensitivity of the liquid fertilizer; the higher the crystallization sensitivity, the smaller the preset temperature deviation frequency setting. Alternatively, it can be set based on the total number of temperature detection points within a unit time period; the more detection points, the larger the preset temperature deviation frequency setting. It can also be set based on the length of the delivery pipeline; the longer the pipeline, the larger the preset temperature deviation frequency setting.

[0177] For example, the preset temperature deviation percentage can be set based on the total number of detection points in the current conveying stage; the more detection points, the larger the preset temperature deviation percentage. Alternatively, it can be set based on the quality stability requirements of the liquid fertilizer product; the higher the quality requirements, the smaller the preset temperature deviation percentage. It can also be set based on the degree of impact of crystallization blockage; the greater the impact, the smaller the preset temperature deviation percentage.

[0178] For example, the central control system first confirms that the frequency and percentage of temperature deviations both meet the triggering conditions, then sequentially retrieves the upper limit values ​​of the liquid fertilizer temperature corresponding to the two previous conveying stages. Subsequently, it sends adjustment instructions to the temperature control execution modules of the two conveying stages. The temperature control modules start heating or cooling operations to adjust the real-time temperature of the liquid fertilizer in the corresponding stage to the upper limit value. After the temperature reaches the target, the temperature is kept stable, and the adjustment operation is completed.

[0179] By using this method, when the number of abnormal temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage is not zero, the frequency of temperature deviation is obtained by calculating the ratio of the number of abnormal temperature detection points to the number of temperature detection points within a unit time period. The percentage of temperature deviation is obtained by calculating the corresponding ratio within all time periods. This method can accurately quantify the frequency and overall range of temperature anomalies and avoid misjudging the severity of temperature anomalies.

[0180] With this implementation, when the frequency of temperature deviation is greater than or equal to the preset frequency of temperature deviation, and the proportion of temperature deviation is greater than or equal to the preset proportion of temperature deviation, the upper limit values ​​of liquid fertilizer temperature corresponding to the two previous conveying stages are obtained. This can match the temperature control boundary of the preceding stage and avoid adjustments exceeding the safety threshold. Adjusting the liquid fertilizer temperature of the first two conveying stages to the upper limit value of liquid fertilizer temperature can prioritize ensuring that the fertilizer does not crystallize when the temperature measurement system experiences batch anomalies, reducing the risk of pipeline blockage and unqualified finished products, and improving the operational stability under abnormal conditions.

[0181] Figure 13 A schematic flowchart of the seventh packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 13 As shown, in some implementations, the above method also includes S250 to S260, which will be described in detail below.

[0182] S250: After adjusting the liquid fertilizer temperature to the upper limit of the liquid fertilizer temperature for the two previous conveying stages, obtain the frequency of temperature deviation after adjusting to the upper limit of the liquid fertilizer temperature, and use it as the correction temperature deviation frequency. Obtain the percentage of temperature deviation after adjusting to the upper limit of the liquid fertilizer temperature, and use it as the correction temperature deviation percentage.

[0183] In this implementation, the temperature adjustment operations of the two preceding transport stages are completed. After stabilizing the temperature of the two stages at their respective upper limits of liquid fertilizer temperature, the abnormal temperature data within a unit time period of the current transport stage are re-statistically counted according to the same statistical rules as before, and the corrected temperature deviation frequency is obtained for evaluating the adjustment effect.

[0184] For example, after the temperature adjustment is completed and stabilized for the preset duration, the central control system recounts the number of abnormal temperature detection points in the current conveying stage according to the original unit time period division rules, and calculates the corrected temperature deviation frequency.

[0185] For example, after the adjustment is completed, wait for the temperature to stabilize for one unit time period. Select this stable unit time period for statistics. There are a total of 8 temperature detection points in this unit time period. The number of abnormal temperature detection points is 1. The calculation process of the corrected temperature deviation frequency is 1÷8=0.125, and the corrected temperature deviation frequency is 0.125.

[0186] In this implementation, after the temperature adjustment is completed and stabilized, the abnormal temperature data of all statistical time periods after the adjustment are summarized, and the corrected temperature deviation ratio is calculated for overall evaluation of the abnormal temperature situation after the adjustment.

[0187] For example, by summarizing the abnormal temperature detection points and the total number of detection points for all unit time periods after adjustment, the ratio can be calculated to obtain the corrected temperature deviation percentage.

[0188] For example, after the adjustment, there are 4 time periods in total. The total number of abnormal temperature detection points is 2, and the total number of temperature detection points is 32. The calculation process of the corrected temperature deviation ratio is 2÷32=0.0625, and the corrected temperature deviation ratio is 0.0625.

[0189] S260. When the frequency of corrected temperature deviation is greater than or equal to the preset frequency of temperature deviation, and the percentage of corrected temperature deviation is greater than or equal to the preset percentage of temperature deviation, a maintenance prompt message is issued to remind the liquid fertilizer conveying pipeline in the current conveying stage to be inspected.

[0190] In this implementation, the adjusted temperature deviation frequency is compared with the preset temperature deviation frequency, and the adjusted temperature deviation percentage is compared with the preset temperature deviation percentage. When both conditions are met, a maintenance prompt message is sent to the staff, prompting them to manually clean the crystals accumulated in the pipeline during the current transportation stage.

[0191] For example, after the central control system completes the comparison of two parameters and confirms that the triggering conditions are met simultaneously, it automatically sends a prompt message to the production management terminal to notify maintenance personnel to handle the issue.

[0192] By adjusting the temperature of the liquid fertilizer in the first two transport stages to the upper limit of the liquid fertilizer temperature, the frequency and percentage of temperature deviation correction can be obtained. This can verify the effect of temperature adjustment on improving temperature measurement anomalies and distinguish whether the temperature measurement anomalies are caused by fertilizer crystallization or pipeline malfunction.

[0193] With this implementation method, when the frequency of corrected temperature deviation is still greater than or equal to the preset frequency of temperature deviation and the proportion of corrected temperature deviation is still greater than or equal to the preset proportion of temperature deviation, it is determined that the abnormality is not caused by temperature incompatibility, triggering a maintenance prompt, which can promptly locate the pipeline's own fault and avoid ineffective temperature control adjustments.

[0194] Figure 14 A schematic flowchart of the eighth packaging control method for liquid fertilizer production provided in this application embodiment is shown below. Figure 14 As shown, in some implementations, the above method also includes S270 to S280, which will be described in detail below.

[0195] S270. When the solubility change of liquid fertilizer with temperature is less than a preset solubility change value, and the liquid fertilizer is an amino acid liquid fertilizer or humic acid liquid fertilizer that is easily decomposed at high temperatures, obtain the upper limit values ​​for the liquid fertilizer's transport temperature and packaging temperature. Obtain the storage tank volume for the liquid fertilizer packaging, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer. The upper limit value for packaging temperature is less than the upper limit value for transport temperature.

[0196] In this implementation, the solubility change of the liquid fertilizer with temperature is detected first, and the type of liquid fertilizer is confirmed. After meeting the two conditions of the solubility change value being less than the preset value and being an amino acid liquid fertilizer or humic acid liquid fertilizer that is easily decomposed at high temperatures, the maximum allowable temperature during the liquid fertilizer transportation process and the maximum allowable temperature during the packaging stage are obtained respectively. Then, the volume of the storage tank to be packaged, the temperature difference between the inside and outside of the tank, and the specific heat capacity of the liquid are obtained to provide parameters for subsequent differentiated temperature control.

[0197] For example, retrieve the solubility change value and product type information of the current batch of liquid fertilizer from the product formula library, confirm that the triggering conditions are met, retrieve the upper limit value of the conveying temperature and the upper limit value of the packaging temperature, and then obtain the corresponding parameters of the storage tank.

[0198] For example, the saturated solubility of liquid fertilizers at different temperatures can be measured in a laboratory, and the change in solubility for every 1°C change in temperature can be calculated to obtain the solubility change value. Alternatively, the solubility change value with temperature can be directly calculated using the types and concentrations of solutes in the product formula and stored in a formula library. Alternatively, industry testing data for the corresponding category of liquid fertilizers can be queried to obtain the solubility change value.

[0199] For example, the setting can be based on the strictness of liquid fertilizer crystallization control; the stricter the control, the smaller the preset solubility change value. Alternatively, it can be based on the thermal stability of the active ingredients in the liquid fertilizer; the worse the thermal stability, the smaller the preset solubility change value. Or, it can be based on the temperature fluctuation range of the production environment; the greater the fluctuation, the larger the preset solubility change value.

[0200] For example, the types of amino acid liquid fertilizers and humic acid liquid fertilizers that are easily decomposed at high temperatures can be: liquid fertilizers containing free amino acids with a free amino acid content greater than 10%, as free amino acids are prone to decomposition and polymerization at high temperatures; high-concentration humic acid liquid fertilizers with a mineral-derived humic acid content greater than 20%, as the active humic acid is prone to oxidative decomposition at high temperatures; and liquid fertilizers containing compound amino acid chelated trace elements, as the chelated structure is prone to decomposition and inactivation at high temperatures.

[0201] For example, the upper limits of the conveying temperature and packaging temperature of liquid fertilizer are determined as follows: the upper limit of the conveying temperature is determined based on the requirements for preventing crystallization and the thermal stability of the components; it must meet the requirement of not crystallizing while not exceeding the decomposition temperature of the components. The upper limit of the packaging temperature is determined based on the storage requirements after packaging and the thermal stability of the components; since long-term storage is required after packaging, the temperature must be strictly controlled to prevent component decomposition.

[0202] For example, to ensure no crystallization during the conveying stage, a relatively high upper temperature limit can be set. During the packaging stage, where storage time is longer, the upper temperature limit is 3-5°C lower than the conveying temperature limit. When the upper conveying temperature limit is 40°C, the upper packaging temperature limit is set to 35-37°C. When the upper conveying temperature limit is 35°C, the upper packaging temperature limit is set to 30-32°C.

[0203] In this implementation, the storage tank volume, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer can be obtained according to the previous parameter acquisition rules. This provides basic parameters for the subsequent calculation of thermal inertia response time. The parameter acquisition logic in this step is consistent with the parameter acquisition logic in the pre-packaging stage.

[0204] For example, the storage tank volume is retrieved from the central control system's equipment parameter database, the temperature difference between the inside and outside of the storage tank is calculated using temperature sensors, and the specific heat capacity of the liquid fertilizer is retrieved from the product formula database to complete the parameter acquisition.

[0205] In this implementation method, it is explicitly required that the upper limit of the packaging temperature be lower than the upper limit of the conveying temperature to ensure that the active ingredients of the product will not decompose due to high temperature after packaging, and to ensure that crystallization will not occur during the conveying process.

[0206] For example, for liquid fertilizers that meet the triggering conditions, the upper limit of the packaging temperature is always set lower than the upper limit of the delivery temperature, taking into account both the need to prevent crystallization and the need to prevent decomposition.

[0207] S280. During the conveying stage prior to packaging, the temperature of the liquid fertilizer is controlled to be below the upper limit of the conveying temperature. The thermal inertia response time is determined based on the storage tank volume, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer. During the thermal inertia response time prior to packaging, the liquid fertilizer temperature is adjusted to be below the upper limit of the packaging temperature to reduce energy consumption during the packaging process.

[0208] In this implementation, during each transport stage before packaging, the real-time temperature of the liquid fertilizer is controlled below the upper limit of the transport temperature. This satisfies the requirement to prevent crystallization during transport while also preventing the temperature from exceeding the component decomposition threshold.

[0209] For example, the temperature of the liquid fertilizer in the preceding conveying stage can be collected in real time and compared with the upper limit of the conveying temperature. When the real-time temperature is greater than or equal to 95% of the upper limit of the conveying temperature, the output power of the heating device is reduced. When the real-time temperature reaches the upper limit of the conveying temperature, the heating is turned off and a small cooling is started to ensure that the temperature is always maintained below the upper limit of the conveying temperature.

[0210] In this implementation, the corresponding thermal inertia response time can be obtained by combining the already acquired storage tank volume, the temperature difference between the inside and outside of the storage tank and the specific heat capacity of the liquid fertilizer with an empirical value table, providing a time basis for adjusting the temperature in advance.

[0211] For example, the corresponding thermal inertial response time can be directly retrieved from a pre-established empirical value table by matching the values ​​of the three parameters to the corresponding interval.

[0212] For example, an empirical value table containing different parameter ranges can be pre-established, such as a storage tank volume of 5-10 cubic meters, a temperature difference between the inside and outside of the storage tank of 3-6℃, and a specific heat capacity of liquid fertilizer of 3-4 kJ / (kg·℃), corresponding to a thermal inertial response time of 30 minutes. When the parameters fall within this range combination, the thermal inertial response time of 30 minutes is directly obtained from the empirical table.

[0213] In this implementation, temperature adjustment is initiated in advance based on the thermal inertia response time. Before entering the packaging stage, the temperature of the liquid fertilizer is adjusted to be lower than the upper limit of the packaging temperature, ensuring that the temperature has reached the standard when entering the packaging stage, and there is no need to adjust the temperature quickly.

[0214] For example, the timing of the start-up adjustment can be determined by working backward from the thermal inertia response time, and the temperature can be gradually reduced to the target range in stages to avoid rapid cooling and increased energy consumption.

[0215] For example, the thermal inertia response time is 30 minutes, the upper limit of the packaging temperature is 35°C, and the current temperature of the liquid fertilizer is 39°C. The specific execution rhythm is as follows: for the first 20 minutes, natural cooling is initiated, heating is stopped, and the temperature is lowered by relying on ambient heat dissipation to reduce the temperature to 36°C. For the next 10 minutes, a small-power cooling is initiated to stabilize the temperature at 34°C, which meets the requirement of being below the upper limit of the packaging temperature.

[0216] For example, the temperature can be gradually lowered before entering the packaging stage, eliminating the need to turn on high-power cooling equipment for rapid cooling after entering the packaging stage, thus reducing the energy consumption of high-power cooling. Pre-adjustment allows the temperature to stabilize and meet the target before entering the packaging stage, eliminating the need for continuous temperature control during the packaging process, further reducing continuous energy consumption during packaging.

[0217] With this implementation, when the solubility change of liquid fertilizer with temperature is less than the preset solubility change value, and it is an amino acid liquid fertilizer or humic acid liquid fertilizer that is easily decomposed at high temperatures, the corresponding upper limit value of conveying temperature and upper limit value of packaging temperature are obtained first. During the conveying stage before packaging, the temperature of the liquid fertilizer is controlled to be less than the upper limit value of conveying temperature, which can prevent the fertilizer from decomposing due to excessive temperature during the conveying process and ensure the stability of the effective components of the fertilizer.

[0218] This method combines the storage tank volume of the liquid fertilizer packaging, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer to calculate the thermal inertia response time. It can accurately match the cooling advance of special fertilizers, avoiding the problem of temperature not meeting the standard caused by improper cooling timing. Within the thermal inertia response time, the temperature of the liquid fertilizer is adjusted to be lower than the upper limit of the packaging temperature. There is no need to add additional cooling equipment, which can effectively reduce the energy consumption of the packaging process. At the same time, it can avoid fertilizer deterioration caused by excessive temperature after packaging and improve the storage stability of the finished product.

[0219] This application also provides a packaging control system for liquid fertilizer production, including units for implementing the method described above.

[0220] Figure 15 A schematic diagram of the logic structure of a packaging control system for liquid fertilizer production provided in this application embodiment is shown below. Figure 15 As shown, the system 1 of this embodiment includes a processing unit 11, a storage unit 12, and a transceiver unit 13. The processing unit 11 is used to process data, the storage unit 12 is used to store data, and the transceiver unit 13 is used to send and receive data. The processing unit 11, the storage unit 12, and the transceiver unit 13 cooperate with each other to implement the above-described method. The beneficial effects of the embodiments of this application have been described in the above-described method and will not be repeated here.

[0221] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0222] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0223] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a photographing device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0224] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0225] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0226] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0227] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0228] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A packaging control method for liquid fertilizer production, characterized in that, The method includes: The process involves obtaining the liquid fertilizer temperature in the production packaging, the workshop ambient temperature, and the packaging queuing time; determining the deviation between the workshop ambient temperature and the preset workshop ambient temperature as the ambient temperature deviation value; determining the ambient temperature compensation coefficient based on the ambient temperature deviation value; determining the waiting time compensation coefficient based on the packaging queuing time; and determining the sum of 1, the ambient temperature compensation coefficient, and the waiting time compensation coefficient as the comprehensive temperature adjustment coefficient. Obtain the base temperature corresponding to the current conveying stage; determine the product of the base temperature and the comprehensive temperature adjustment coefficient as the target temperature for the stage; adjust the liquid fertilizer temperature of the current conveying stage to the target temperature for the stage; wherein, the current conveying stage includes the fresh discharge stage, the transit and temporary storage stage, and the packaging stage.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the liquid fertilizer concentration; obtain the temperature correction factor corresponding to the liquid fertilizer concentration to prevent crystallization; The product of the target temperature and the temperature correction factor is determined as the stage adjustment temperature; the product of the stage adjustment temperature and the comprehensive temperature adjustment coefficient is determined as the stage correction temperature; and the temperature of the liquid fertilizer in the current delivery stage is adjusted to the stage correction temperature.

3. The method according to claim 2, characterized in that, The method further includes: When the current transportation stage is the packaging stage, obtain the storage tank volume of the liquid fertilizer packaging, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer; The thermal inertia response time is determined based on the storage tank volume, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer. Within the thermal inertia response time before the packaging stage, the temperature of the liquid fertilizer is adjusted to the stage correction temperature corresponding to the packaging stage.

4. The method according to claim 3, characterized in that, The method further includes: Obtain the pressure in the liquid fertilizer delivery pipeline during the current delivery phase; When the solubility of liquid fertilizer increases with temperature and the fertilizer pipeline pressure is less than the preset fertilizer pipeline pressure, obtain the preceding temperature correction factor corresponding to the previous transportation stage of the current transportation stage; increase the preset temperature correction factor by increasing the preceding temperature correction factor.

5. The method according to claim 4, characterized in that, The method further includes: When the solubility of liquid fertilizer increases with temperature and the fertilizer pipeline pressure is greater than or equal to the preset fertilizer pipeline pressure, obtain the subsequent temperature correction factor corresponding to the next delivery stage of the current delivery stage; increase the preset temperature correction factor by increasing the subsequent temperature correction factor.

6. The method according to claim 5, characterized in that, The method further includes: The system acquires the real-time detected temperature, target detected temperature, and temperature deviation threshold of multiple temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage; it determines the difference between the target detected temperature and the real-time detected temperature of multiple temperature detection points as the real-time temperature deviation value; and it marks the temperature detection point as an abnormal temperature detection point when the real-time temperature deviation value of the temperature detection point is greater than or equal to the temperature deviation threshold. When the number of abnormal temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage is 0, the real-time detected temperature amplitude and the real-time detected temperature average of multiple temperature detection points are determined. The ratio of the real-time detected temperature amplitude to the real-time detected temperature average is determined as the temperature uniformity assessment value of the liquid fertilizer conveying pipeline during the current conveying stage. When the temperature uniformity assessment value is less than the preset temperature uniformity assessment value, it is determined that there is crystallization on the pipe wall of the liquid fertilizer conveying pipeline during the current conveying stage. The preset temperature correction factor is increased to eliminate the crystallization on the pipe wall of the liquid fertilizer conveying pipeline during the current conveying stage. Among them, the real-time detected temperature amplitude is the difference between the maximum and minimum real-time detected temperatures of multiple temperature detection points.

7. The method according to claim 6, characterized in that, The method further includes: When the number of abnormal temperature detection points in the liquid fertilizer conveying pipeline during the current conveying stage is not zero, determine the ratio of the number of abnormal temperature detection points to the number of temperature detection points within a unit time period as the temperature deviation frequency; determine the ratio of the number of abnormal temperature detection points to the number of temperature detection points within all time periods as the temperature deviation percentage; obtain the upper limit value of liquid fertilizer temperature corresponding to the two conveying stages before the current conveying stage. When the frequency of temperature deviation is greater than or equal to the preset frequency of temperature deviation, and the percentage of temperature deviation is greater than or equal to the preset percentage of temperature deviation, the liquid fertilizer temperature corresponding to the two previous conveying stages will be adjusted to the upper limit of the liquid fertilizer temperature.

8. The method according to claim 7, characterized in that, The method further includes: After adjusting the liquid fertilizer temperature to the upper limit of the liquid fertilizer temperature for the two previous conveying stages, the frequency of temperature deviation after adjusting to the upper limit of the liquid fertilizer temperature is obtained as the correction temperature deviation frequency; the percentage of temperature deviation after adjusting to the upper limit of the liquid fertilizer temperature is obtained as the correction temperature deviation percentage. When the frequency of corrected temperature deviation is greater than or equal to the preset frequency of temperature deviation, and the percentage of corrected temperature deviation is greater than or equal to the preset percentage of temperature deviation, a maintenance prompt message is issued to remind the liquid fertilizer conveying pipeline in the current conveying stage to be inspected.

9. The method according to claim 8, characterized in that, The method further includes: When the solubility change of liquid fertilizer with temperature is less than the preset solubility change value, and the liquid fertilizer is an amino acid liquid fertilizer or humic acid liquid fertilizer that is easily decomposed at high temperatures, the upper limit values ​​of the liquid fertilizer's conveying temperature and packaging temperature are obtained; the storage tank volume of the liquid fertilizer packaging, the temperature difference between the inside and outside of the storage tank, and the specific heat capacity of the liquid fertilizer are obtained; wherein, the upper limit value of the packaging temperature is less than the upper limit value of the conveying temperature. During the transport stage before packaging, the temperature of the liquid fertilizer is controlled to be lower than the upper limit of the transport temperature; the thermal inertia response time is determined based on the storage tank volume, the temperature difference between the inside and outside of the storage tank and the specific heat capacity of the liquid fertilizer; during the thermal inertia response time before packaging, the temperature of the liquid fertilizer is adjusted to be lower than the upper limit of the packaging temperature to reduce energy consumption in the packaging process.

10. A packaging control system for liquid fertilizer production, characterized in that, Includes units for implementing the method of any one of claims 1 to 9.

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