Sodium hydrosulfite synthesis control method and system and electronic equipment

Abstract

The invention discloses a control method and system for sodium hydrosulfite synthesis and electronic equipment, and the control method comprises the following steps: a production starting instruction is obtained, and the production starting instruction comprises control configuration of a pretreatment stage, a feeding stage, an absorption liquid stage, a heat preservation stage, a large charging stage, a small charging stage, a cold charging stage and a discharging stage. By acquiring the production starting instruction and controlling the operation of each stage according to the preset configuration, the automation of the production process is realized, human errors are reduced, and the strict requirement on highly concentrated spirit of operators is lowered. Operating parameters of each stage can be accurately controlled according to a preset program, and product quality fluctuation caused by unstable operation in a traditional process is avoided. The operation parameters and the feeding sequence of each stage are automatically executed according to the preset configuration, the whole process is provided with safety alarm and termination and abnormity handling programs, the reaction process is continuous, smooth and safe, shutdown waiting or human errors are avoided, and the overall production efficiency and safety are improved.

Description

Technical Field

[0001] This invention relates to the field of technology, and in particular to a control method, system, and electronic device for the synthesis of sodium hydrosulfite. Background Technology

[0002] Sodium hydrosulfite, also known as sodium sodium sulfite or sodium hydrosulfite powder, is an important chemical raw material and bleaching agent, widely used in textiles, papermaking, food, pharmaceuticals, printing and dyeing industries. Current sodium hydrosulfite production processes typically employ a synthesis method using ethylene oxide as a raw material, reacting the product with an absorbent liquid under high temperature and pressure conditions.

[0003] Currently used production processes generally suffer from problems such as cumbersome operation procedures, high dependence on manual labor, insufficient precision in temperature and pressure control, and unstable feeding, resulting in large fluctuations in product quality and potential safety hazards. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the present invention aims to provide a control method, system, and electronic device for the synthesis of sodium hydrosulfite.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] In a first aspect, the present invention provides a method for controlling the synthesis of sodium hydrosulfite, the method comprising the following steps:

[0007] Obtain a production start command, which includes control configurations for the pretreatment stage, feeding stage, absorption liquid stage, heat preservation stage, large feeding stage, small feeding stage, cold material stage, and discharge stage;

[0008] Based on the production start command, execute the following control configuration:

[0009] During the pretreatment stage, the steam valve of the AE reactor is controlled to heat the AE material to the first set temperature, the vent valve of the AE reactor is closed and the nitrogen valve is opened for pressurization;

[0010] During the feeding stage, the synthesis reactor is started and connected to the AE reactor; the AE feed valve of the synthesis reactor is opened, and a preset volume of AE material is added to the synthesis reactor; after the AE feed valve is closed, the mother liquor feed valve of the synthesis reactor is opened, and a preset volume of mother liquor is added to the synthesis reactor; the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the first threshold, and the steam valve of the synthesis reactor is opened to raise the temperature to the second set temperature. During the heating process, the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the second threshold.

[0011] During the absorption liquid stage, the absorption liquid inlet valve and EO inlet valve of the synthesis vessel are controlled according to the first preset configuration, and the absorption liquid and EO material are added to the synthesis vessel in batches according to the first preset configuration; during the absorption liquid stage, the temperature of the synthesis vessel is controlled to be maintained in the first preset temperature range, and the pressure is controlled not to exceed the third threshold by adjusting the vent valve of the synthesis vessel throughout the process.

[0012] During the heat preservation stage, the synthesis reactor is controlled to maintain the preset heat preservation time at the third set temperature, while the EO feed valve is controlled to keep the EO material continuously added at the preset flow rate. Throughout the process, the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the fourth threshold.

[0013] During the large-scale feeding stage, the opening and closing of the AE feed valve, ME feed valve, absorbent feed valve, and E0 feed valve of the synthesis reactor are controlled according to the second preset configuration. AE material, ME material, absorbent, and EO material are added to the synthesis reactor in batches according to the second preset configuration. At the same time, the pressure of the vent valve of the synthesis reactor is controlled by adjusting it according to the second preset configuration.

[0014] During the small feeding stage, the opening and closing of the absorbent feed valve and the E0 feed valve of the synthesis reactor are controlled according to the third preset configuration. The absorbent and EO materials are added to the synthesis reactor according to the third preset configuration. At the same time, the pressure of the vent valve of the synthesis reactor is controlled according to the third preset configuration.

[0015] During the cooling stage, the cooling system is turned on to cool the water, so that the mixture in the reactor is cooled to below the cooling threshold.

[0016] During the feeding stage, feeding is performed according to the fourth preset configuration.

[0017] In conjunction with the first aspect, the present invention also provides a first specific embodiment of the first aspect. Specifically, the first preset configuration includes multiple feed configuration parameters for batch addition. Each feed configuration parameter includes absorbent flow rate, corresponding absorbent feeding time, EO material flow rate, corresponding EO feeding time, and temperature threshold of the synthesis vessel.

[0018] In conjunction with the first aspect, the present invention also provides a second specific implementation of the first aspect. Specifically, the second preset configuration includes multiple large feeding configuration parameters for batch feeding. Each large feeding configuration parameter includes AE material flow rate, corresponding AE feeding time, ME material flow rate, corresponding ME feeding time, absorbent flow rate, corresponding absorbent feeding time, EO material flow rate, corresponding EO feeding time, and a sixth threshold for controlling the pressure of the synthesis reactor.

[0019] In conjunction with the first aspect, the present invention also provides a fourth specific implementation of the first aspect. Specifically, the third preset configuration includes multiple small feeding configuration parameters for batch feeding. Each small feeding configuration parameter includes absorbent flow rate, corresponding absorbent feeding time, EO material flow rate, corresponding EO feeding time, and a seventh threshold for controlling the pressure of the synthesis reactor.

[0020] In conjunction with the first aspect, the present invention also provides a fifth specific embodiment of the first aspect. Specifically, after the large feeding stage is completed, heat preservation control is performed. The heat preservation control includes closing the AE feed valve, ME feed valve and absorbent feed valve, controlling the EO feed valve to continuously add at a preset flow rate until the small feeding stage is entered, adjusting the vent valve of the synthesis reactor, and controlling the pressure not to exceed the eighth threshold.

[0021] After the small feeding stage is completed, heat preservation control is also carried out. The heat preservation control includes closing the absorbent feed valve, controlling the EO feed valve to continuously add EO at a preset flow rate until the discharge stage is entered, adjusting the vent valve of the synthesis reactor, and controlling the pressure to not exceed the ninth threshold.

[0022] In conjunction with the first aspect, the present invention also provides a sixth specific embodiment of the first aspect. Specifically, the fourth preset configuration includes controlling the nitrogen pressurization valve to pressurize the mixture and controlling the pressure to not exceed the tenth threshold; and starting the steam heating to control the temperature of the mixture within the second preset temperature range.

[0023] Secondly, the present invention also provides a control system for the synthesis of sodium hydrosulfite, the control system comprising:

[0024] The acquisition module is used to acquire production start instructions, which include control configurations for the pretreatment stage, feeding stage, absorption liquid stage, heat preservation stage, large feeding stage, small feeding stage, cold material stage and discharge stage.

[0025] The control module is used to execute the following control configuration based on the production start command:

[0026] During the pretreatment stage, the steam valve of the AE reactor is controlled to heat the AE material to the first set temperature, the vent valve of the AE reactor is closed and the nitrogen valve is opened for pressurization;

[0027] During the feeding stage, the synthesis reactor is started and connected to the AE reactor; the AE feed valve of the synthesis reactor is opened, and a preset volume of AE material is added to the synthesis reactor; after the AE feed valve is closed, the mother liquor feed valve of the synthesis reactor is opened, and a preset volume of mother liquor is added to the synthesis reactor; the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the first threshold, and the steam valve of the synthesis reactor is opened to raise the temperature to the second set temperature. During the heating process, the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the second threshold.

[0028] During the absorption liquid stage, the absorption liquid inlet valve and EO inlet valve of the synthesis vessel are controlled according to the first preset configuration, and the absorption liquid and EO material are added to the synthesis vessel in batches according to the first preset configuration; during the absorption liquid stage, the temperature of the synthesis vessel is controlled to be maintained within the preset temperature range, and the pressure is controlled not to exceed the third threshold by adjusting the vent valve of the synthesis vessel throughout the process.

[0029] During the heat preservation stage, the synthesis reactor is controlled to maintain the preset heat preservation time at the third set temperature, while the EO feed valve is controlled to keep the EO material continuously added at the preset flow rate. Throughout the process, the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the fourth threshold.

[0030] During the large-scale feeding stage, the opening and closing of the AE feed valve, ME feed valve, absorbent feed valve, and E0 feed valve of the synthesis reactor are controlled according to the second preset configuration. AE material, ME material, absorbent, and EO material are added to the synthesis reactor in batches according to the second preset configuration. At the same time, the pressure of the vent valve of the synthesis reactor is controlled by adjusting it according to the second preset configuration.

[0031] During the small feeding stage, the opening and closing of the absorbent feed valve and the E0 feed valve of the synthesis reactor are controlled according to the third preset configuration. The absorbent and EO materials are added to the synthesis reactor according to the third preset configuration. At the same time, the pressure of the vent valve of the synthesis reactor is controlled according to the third preset configuration.

[0032] During the cooling stage, the cooling system is turned on to cool the water, so that the mixture in the reactor is cooled to below the cooling threshold.

[0033] During the feeding stage, feeding is performed according to the fourth preset configuration.

[0034] Thirdly, this application provides an electronic device comprising multiple functional modules; the multiple functional modules interact to implement the methods performed by the electronic device in the first aspect and its various embodiments described above. The multiple functional modules can be implemented based on software, hardware, or a combination of software and hardware, and the multiple functional modules can be arbitrarily combined or divided based on specific implementations.

[0035] Fourthly, this application provides an electronic device including at least one processor and at least one memory, wherein the at least one memory stores computer program instructions, and when the electronic device is running, the at least one processor executes the methods executed by the electronic device in the first aspect and its various embodiments described above.

[0036] Fifthly, this application also provides a computer program product containing instructions that, when the computer program product is run on a computer, cause the computer to perform the methods executed by the server or electronic device in the first aspect and its various embodiments described above.

[0037] Sixthly, this application also provides a computer-readable storage medium storing a computer program that, when executed by a computer, causes the computer to perform the methods performed by the server or electronic device described in the first aspect and its various embodiments.

[0038] Compared with the prior art, the present invention has at least the following beneficial effects:

[0039] This invention provides a control method for the synthesis of sodium hydrosulfite. The control method includes the following steps: obtaining a production start-up command, which includes control configurations for a pretreatment stage, a feeding stage, an absorbent liquid stage, a heat preservation stage, a large feeding stage, a small feeding stage, a cold material stage, and a discharge stage. Based on the production start-up command, the following control configurations are executed: In the pretreatment stage, the steam valve of the AE reactor is controlled to heat the AE material to a first set temperature; the vent valve of the AE reactor is closed, and the nitrogen valve is opened for pressurization. In the feeding stage, the synthesis reactor is started, connected to the AE reactor; the AE feed valve of the synthesis reactor is opened, and a preset volume of AE material is added to the synthesis reactor; after closing the AE feed valve, the mother liquor feed valve of the synthesis reactor is opened, and a preset volume of mother liquor is added to the synthesis reactor; the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed a first threshold, and simultaneously the steam valve of the synthesis reactor is opened to raise the temperature to a second set temperature; during the heating process, the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the second threshold. During the absorption liquid stage, the absorbent liquid inlet valve and EO inlet valve of the synthesis reactor are controlled according to the first preset configuration, and absorbent liquid and EO materials are added to the synthesis reactor in batches according to the first preset configuration. During the absorption liquid stage, the temperature of the synthesis reactor is controlled to be maintained within the first preset temperature range, and the pressure of the vent valve of the synthesis reactor is adjusted throughout the process to ensure that it does not exceed the third threshold. During the heat preservation stage, the synthesis reactor is controlled to maintain a preset heat preservation time at the third set temperature, while the EO inlet valve is controlled to continuously add EO materials at a preset flow rate, and the pressure of the vent valve of the synthesis reactor is adjusted throughout the process to ensure that it does not exceed the fourth threshold. During the large-scale feeding stage, the opening and closing of the AE inlet valve, ME inlet valve, absorbent liquid inlet valve, and EO inlet valve of the synthesis reactor are controlled according to the second preset configuration, and AE materials, ME materials, absorbent liquid, and EO materials are added to the synthesis reactor in batches according to the second preset configuration. At the same time, the pressure of the vent valve of the synthesis reactor is adjusted throughout the process according to the second preset configuration. During the initial feeding stage, the absorbent feed valve and the E0 feed valve of the synthesis reactor are controlled to open and close according to the third preset configuration. The absorbent and EO materials are added to the synthesis reactor according to the third preset configuration. Simultaneously, the pressure of the vent valve of the synthesis reactor is adjusted according to the third preset configuration. During the cooling stage, the cooling system is activated to cool the mixture in the reactor to below the cooling threshold. During the discharge stage, discharge is performed according to the fourth preset configuration.

[0040] This invention automates the production process by acquiring production start-up commands and controlling each stage of operation according to preset configurations. This reduces manual intervention and the operator's dependence on the production process. Operating parameters at each stage (such as temperature, pressure, and feed flow rate) can be precisely controlled according to preset values, avoiding product quality fluctuations caused by operational instability in traditional processes. Operating parameters and feeding sequence at each stage are automatically executed according to preset configurations, ensuring a continuous and smooth reaction process, avoiding downtime or human delays, and improving overall production efficiency. This invention achieves a high degree of automation in the sodium hydrosulfite synthesis process. Feeding, temperature control, pressure regulation, and heat preservation operations at each stage can be executed automatically with almost no manual intervention, significantly improving production efficiency and operational safety. Simultaneously, through automated control of process parameters, product quality stability and reaction process controllability are achieved. Attached Figure Description

[0041] Figure 1 This is a schematic flowchart of a method for controlling the synthesis of sodium hydrosulfite according to the present invention. Detailed Implementation

[0042] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0043] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0044] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0045] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0046] Sodium hydrosulfite, chemically known as sodium dithionite, is a white crystalline powder existing as a dihydrate with the molecular formula (Na₂S₂O₄·2H₂O). It is widely used in the textile industry for dyeing, washing, printing, and bleaching of textiles. It can also be used as a bleaching agent for silk, wool, and nylon fabrics, leaving them with vibrant colors that are less prone to fading. However, sodium hydrosulfite has extremely strong reducing properties and can generate heat when it comes into contact with oxidizers, small amounts of water, or absorbs humid air, potentially leading to combustion or even explosion. It is classified as a Class IV spontaneously combustible substance and releases toxic sulfur dioxide upon contact with water.

[0047] In this invention, sodium hydrosulfite is synthesized using ME and AE as main raw materials, supplemented by the recycling of absorbent and mother liquor, thereby forming a stable and efficient synthesis system. The specific descriptions of each raw material are as follows:

[0048] (1) ME is one of the key raw materials for the synthesis reaction of sodium hydrosulfite. Its components are solid sodium metabisulfite powder, methanol with dissolved sulfur dioxide, and a small amount of additives mixed in a certain proportion. Sodium metabisulfite provides the main sulfur source for the reaction, methanol serves as the solvent and reaction medium, and simultaneously dissolves and stabilizes the presence of sulfur dioxide. The additives are used to improve the solubility of the materials and the stability of the reaction. With this configuration, ME can generate the intermediate of the target product in the subsequent addition reaction with EO.

[0049] (2) AE is another important reactant in the synthesis of sodium hydrosulfite, which is prepared by mixing solid sodium formate powder, recycled mother liquor, water, and additives in a certain proportion. Sodium formate acts as a reducing agent in the system, participating in the reaction steps related to the sulfur source and promoting the formation of sodium hydrosulfite. The addition of recycled mother liquor ensures the recovery and utilization of by-products and dissolved substances in the reaction system, which reduces production costs and maintains the balance of system components; water acts as a solvent and reaction diluent, which can adjust the ionic strength and reaction rate of the reaction; the additives play a buffering and stabilizing role, preventing the excessive occurrence of side reactions.

[0050] (3) The absorbent is a sulfur dioxide-methanol absorbent, which is one of the essential raw materials in the synthesis reaction of sodium hydrosulfite. This solution is formed by the efficient absorption of sulfur dioxide by methanol, which can provide a stable and controllable source of sulfur dioxide in the reaction process. At the same time, the solvent promotes the dispersion and mixing of raw materials, ensuring the uniformity and controllability of the subsequent reaction.

[0051] (4) EO is ethylene oxide, which is an auxiliary raw material in the synthesis reaction of sodium hydrosulfite. Ethylene oxide can undergo addition and ring-opening reactions with the active components in ME and AE, thereby achieving further conversion of sulfur-containing compounds and the generation of sodium hydrosulfite. Its reactivity is high and it is relatively sensitive to reaction temperature and pressure. Therefore, in actual operation, it is necessary to strictly control the feed flow rate, timing of addition, and conditions inside the reactor to avoid side reactions or safety hazards.

[0052] (5) Mother liquor is the liquid remaining after the synthesis reaction of sodium hydrosulfite reaches its endpoint, and is commonly referred to as mother liquor in the art. Mother liquor contains incompletely converted raw materials, some by-products, and a certain amount of reusable components. In the process of this invention, the mother liquor is recycled back into the AE material, thereby improving the utilization rate of raw materials, reducing emissions, and achieving clean production.

[0053] The main equipment for synthesizing sodium hydrosulfite is the synthesis reactor, equipped with a stirring and heat transfer jacket. During normal reaction, steam is introduced into the jacket to maintain the reaction temperature, and after the reaction is complete, circulating water is introduced into the jacket to cool it down. The heat transfer jacket of the synthesis reactor is connected to the steam system and cooling system via steam valves. The synthesis reactor also has AE feed valves, ME feed valves, absorbent feed valves, EO feed valves, nitrogen valves, vent valves, etc., each valve connected to a corresponding reactor or material container, such as an AE reactor, an ME reactor, etc.

[0054] The foregoing section introduced the relevant technical content of the synthesis of sodium hydrosulfite involved in this application. Based on the above content, the following section, in conjunction with the appendix, describes the process. Figure 1 The solutions provided in the embodiments of this application will be described in detail.

[0055] Figure 1 A schematic flowchart of a control method for synthesizing sodium hydrosulfite, to which the technical solutions of the embodiments of this application can be applied, is shown.

[0056] This embodiment describes a control method for the synthesis of sodium hydrosulfite. By acquiring production start-up commands and controlling each stage of operation according to preset configurations, this method automates the production process, reduces manual intervention, and lowers operators' dependence on the production process. Operating parameters at each stage (such as temperature, pressure, and feed flow rate) can be precisely controlled according to preset values, avoiding product quality fluctuations caused by operational instability in traditional processes. The operating parameters and feeding sequence at each stage are automatically executed according to preset configurations, ensuring a continuous and smooth reaction process, avoiding downtime or human delays, and improving overall production efficiency.

[0057] refer to Figure 1 The method for controlling the synthesis of sodium hydrosulfite described in this embodiment includes the following steps:

[0058] Step S100: Obtain the production start command, which includes the control configuration of the pretreatment stage, feeding stage, absorption liquid stage, heat preservation stage, large feeding stage, small feeding stage, cold material stage and discharge stage.

[0059] In some implementations, operators or the host system select or issue a "production start command" on the HMI. The command includes control configurations for each stage (target temperature, pressure threshold, batch feeding / flow rate, holding time, cooling threshold, and discharge strategy, etc.). Before startup, automatic self-tests are performed: sensor linearity check, critical valve position verification, nitrogen and steam source pressure check, and emergency shutdown function test.

[0060] Step S200: Execute the following control configuration according to the production start command:

[0061] S210: In the pretreatment stage, control the steam valve of the AE reactor to heat the AE material to the first set temperature, close the vent valve of the AE reactor and open the nitrogen valve to pressurize.

[0062] In some implementations, the steam valve of the AE reactor is opened to heat the AE material to a first set temperature, preferably within the range of 40-60°C; more preferably 45-55°C. The vent valve of the AE reactor is closed, and the nitrogen valve is opened for nitrogen sealing, maintaining the pressure inside the reactor at a small positive pressure (preferably 0.01-0.15 MPa, relative to gauge pressure). Stirring is started, and the liquid level and temperature rise curves are monitored. Once the temperature reaches the set value and stabilizes, a "pretreatment complete" signal is reported to the upper control system.

[0063] In the preferred implementation, the pretreatment stage should be monitored and interlocked in real time: abnormal temperature sensor, insufficient steam source pressure, and abnormal nitrogen flow should trigger an alarm and automatically stop the pretreatment.

[0064] S220: During the feeding stage, the synthesis reactor is started and connected to the AE reactor; the AE feed valve of the synthesis reactor is opened, and a preset volume of AE material is added to the synthesis reactor; after the AE feed valve is closed, the mother liquor feed valve of the synthesis reactor is opened, and a preset volume of mother liquor is added to the synthesis reactor; the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the first threshold, and the steam valve of the synthesis reactor is opened to raise the temperature to the second set temperature. During the heating process, the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the second threshold.

[0065] In this step, the AE material, mother liquor, and necessary circulating liquid are introduced into the synthesis reactor in batches to prepare the reaction matrix. Control actions: Start the stirring and jacket heating system of the synthesis reactor; open the communication passage between the synthesis reactor and the AE reactor; open the AE feed valve of the synthesis reactor; add a preset volume of AE material to the synthesis reactor, for example, 10-30% of the total reaction liquid volume. After closing the AE feed valve, open the mother liquor feed valve to add a preset volume of mother liquor, for example, 5-20% of the total reaction liquid volume.

[0066] During the feeding and heating process, the vent valve of the synthesis reactor can be adjusted by a control module (e.g., PLC) according to a strategy to keep the pressure below a first threshold, which, for example, can be 0.20 MPa. Simultaneously, the steam valve is opened to heat the synthesis reactor to a second set temperature, which, for example, can be 50-75°C. During heating, the vent valve continues to be controlled according to the strategy to ensure that the pressure does not exceed the second threshold, which, for example, can be 0.25 MPa.

[0067] S230: In the absorption liquid stage, the absorption liquid inlet valve and EO inlet valve of the synthesis vessel are controlled according to the first preset configuration, and the absorption liquid and EO material are added to the synthesis vessel in batches according to the first preset configuration; in the absorption liquid stage, the temperature of the synthesis vessel is controlled to be maintained in the first preset temperature range, and the pressure of the vent valve of the synthesis vessel is adjusted throughout the process to ensure that it does not exceed the third threshold.

[0068] In this application, the reaction is maintained at the target temperature for a certain period of time to complete the conversion, during which small amounts of EO can be continuously added to ensure the conversion rate. For example, the first preset temperature range can be 45–65°C. The third threshold is 0.15 MPa.

[0069] In a preferred embodiment, the first preset configuration of step S230 includes multiple feed configuration parameters for batch addition. Each feed configuration parameter includes absorbent flow rate, corresponding absorbent feeding time, EO material flow rate, corresponding EO feeding time, and temperature threshold of the synthesis vessel.

[0070] By employing multiple sets of feed configuration parameters in the absorbent stage, precise control can be achieved in batches, quantities, and time intervals. Batch addition of the absorbent ensures sufficient SO2 absorption during the reaction process, preventing the formation of byproducts due to excessively high local concentrations. Batch addition of EO allows for a stable reaction rate with the absorbent, reducing the instantaneous release of heat and maintaining the controllability of the reactor temperature. Furthermore, combined with interlocking protection of the temperature threshold, this preferred embodiment achieves a balance between reaction rate and safety, thereby significantly improving the stability of sodium hydrosulfite synthesis and the consistency of product quality.

[0071] In practical implementation, the first preset configuration includes 5 feeding configuration parameters, for example:

[0072] The first feed configuration parameters are as follows: absorbent flow rate is 50 L / h, feeding time is 110s; EO material flow rate is 20L / h, feeding time is 90s; and the synthesis reactor temperature threshold is 78℃.

[0073] The second feed configuration parameters are as follows: absorbent flow rate is 60 L / h, feeding time is 130s; EO material flow rate is 25L / h, feeding time is 130s; and the synthesis reactor temperature threshold is 79℃.

[0074] The third feed configuration parameters are as follows: absorbent flow rate is 55 L / h, feeding time is 140s; EO material flow rate is 22L / h, feeding time is 130s; and the synthesis reactor temperature threshold is 79℃.

[0075] The fourth feed configuration parameters are: absorbent flow rate of 50 L / h, feeding time of 160s; EO material flow rate of 20L / h, feeding time of 130s; and synthesis reactor temperature threshold of 87℃.

[0076] The fifth feed configuration parameters are as follows: absorbent flow rate is 45 L / h, feeding time is 120s; EO material flow rate is 18L / h, feeding time is 120s; and the synthesis reactor temperature threshold is 60℃.

[0077] S240: During the heat preservation stage, the synthesis reactor is controlled to maintain the preset heat preservation time at the third set temperature, while the EO feed valve is controlled to keep the EO material continuously added at the preset flow rate. Throughout the process, the vent valve of the synthesis reactor is adjusted to control the pressure to not exceed the fourth threshold.

[0078] Maintain the reaction at the target temperature for a certain period of time to complete the conversion, during which small amounts of EO can be continuously added to ensure the conversion rate. Control the temperature of the synthesis vessel at a third set temperature, for example, 55-70°C, and maintain it for a preset holding time, for example, 30-180 min, depending on the scale and feed rate. Continuously feed a small amount of EO at a preset flow rate, for example, 0.1-2% of the total material volume / hour, or according to the mass flow meter setting. Adjust the vent valve to ensure that the pressure does not exceed a fourth threshold, for example, 0.12 MPa.

[0079] S250: During the large-scale feeding stage, the opening and closing of the AE feed valve, ME feed valve, absorbent feed valve, and E0 feed valve of the synthesis reactor are controlled according to the second preset configuration. AE material, ME material, absorbent and EO material are added to the synthesis reactor in batches according to the second preset configuration. At the same time, the pressure of the vent valve of the synthesis reactor is adjusted according to the second preset configuration.

[0080] During the reaction, large quantities of AE, ME (AME), absorbent and EO are added at once or in batches to replenish the reactants and control the final yield.

[0081] In specific implementation, the second preset configuration of step S250 includes multiple large feeding configuration parameters for batch feeding. Each large feeding configuration parameter includes AE material flow rate, corresponding AE feeding time, ME material flow rate, corresponding ME feeding time, absorbent flow rate, corresponding absorbent feeding time, EO material flow rate, corresponding EO feeding time, and a sixth threshold for controlling the pressure of the synthesis reactor.

[0082] By employing multiple sets of configuration parameters during the large-scale feeding stage, precise control of each material in batches, quantities, and timing can be achieved. Batch addition of AE and ME ensures a uniform supply of the main reaction substrates, while batch addition of the absorbent ensures sufficient absorption and neutralization of SO2. Batch addition of EO maintains a stable reaction rate, and the pressure interlock at the sixth threshold prevents safety accidents caused by excessive instantaneous pressure. This design significantly improves the stability, safety, and product quality consistency of the sodium hydrosulfite synthesis process, while reducing reliance on manual intervention and achieving a high degree of automated control.

[0083] In practical implementation, the second preset configuration includes N large feeding configuration parameters (at least 6), for example:

[0084] The first set of feeding parameters are as follows: AE material flow rate is 40 L / h, feeding time is 140s; ME material flow rate is 25 L / h, feeding time is 120s; absorbent flow rate is 50 L / h, feeding time is 140s; EO material flow rate is 20 L / h, feeding time is 90s; and the sixth threshold for controlling the pressure of the synthesis reactor is 0.28MPa.

[0085] The second set of feeding parameters are as follows: AE material flow rate is 45 L / h, feeding time is 120s; ME material flow rate is 28 L / h, feeding time is 110s; absorbent flow rate is 55 L / h, feeding time is 120s; EO material flow rate is 22 L / h, feeding time is 130s; and the sixth threshold for controlling the pressure of the synthesis reactor is 0.26 MPa.

[0086] The third major feeding configuration parameters are: AE material flow rate is 50 L / h, feeding time is 130s; ME material flow rate is 30 L / h, feeding time is 120s; absorbent flow rate is 50 L / h, feeding time is 130s; EO material flow rate is 25L / h, feeding time is 130s; and the sixth threshold for controlling the pressure of the synthesis reactor is 0.25MPa.

[0087] The fourth major feeding configuration parameters are: AE material flow rate is 45 L / h, feeding time is 120s; ME material flow rate is 28 L / h, feeding time is 110s; absorbent flow rate is 48 L / h, feeding time is 120s; EO material flow rate is 23 L / h, feeding time is 120s; and the sixth threshold for controlling the pressure of the synthesis reactor is 0.25MPa.

[0088] The fifth major feeding configuration parameters are: AE material flow rate is 40 L / h, feeding time is 140s; ME material flow rate is 25 L / h, feeding time is 120s; absorbent flow rate is 45 L / h, feeding time is 140s; EO material flow rate is 20 L / h, feeding time is 140s; and the sixth threshold for controlling the pressure of the synthesis reactor is 0.25 MPa.

[0089] The sixth major feeding configuration parameters are: AE material flow rate is 35 L / h, feeding time is 140s; ME material flow rate is 22 L / h, feeding time is 120s; absorbent flow rate is 40 L / h, feeding time is 140s; EO material flow rate is 18 L / h, feeding time is 140s; and the sixth threshold for controlling the pressure of the synthesis reactor is 0.25 MPa.

[0090] S260: During the small feeding stage, the absorbent feed valve and the E0 feed valve of the synthesis reactor are controlled to open and close according to the third preset configuration. The absorbent and EO materials are added to the synthesis reactor according to the third preset configuration. At the same time, the pressure of the vent valve of the synthesis reactor is adjusted according to the third preset configuration.

[0091] In this invention, when the reaction is close to the endpoint, the material ratio is finely adjusted by adding small batches of materials to correct deviations and promote the endpoint conversion.

[0092] In specific implementation, the third preset configuration of step S260 includes multiple small feeding configuration parameters for batch feeding. Each small feeding configuration parameter includes absorbent flow rate, corresponding absorbent feeding time, EO material flow rate, corresponding EO feeding time, and a seventh threshold for controlling the pressure of the synthesis reactor.

[0093] By employing multiple sets of configuration parameters in the small-scale feeding stage, precise and gradual material addition can be achieved. Batch addition of the absorbent ensures sufficient SO2 absorption and reaction uniformity, while batch addition of EO maintains a stable reaction rate. Simultaneously, the pressure interlock protection at the seventh threshold prevents safety accidents caused by excessive instantaneous pressure. This design further enhances the automation level of the synthesis process, ensures the consistency of sodium hydrosulfite product quality and reaction safety, while reducing the need for manual intervention.

[0094] In practical implementation, the third preset configuration includes N small feeding configuration parameters (at least 3), for example:

[0095] The first set of feeding parameters are as follows: absorbent flow rate is 20 L / h, feeding time is 160s; EO material flow rate is 10 L / h, feeding time is 120s; and the seventh threshold for controlling the pressure of the synthesis reactor is 0.3 MPa.

[0096] The second set of feeding parameters are as follows: absorbent flow rate is 18 L / h, feeding time is 160s; EO material flow rate is 8 L / h, feeding time is 120s; and the seventh threshold for controlling the pressure of the synthesis reactor is 0.28 MPa.

[0097] The third set of feeding parameters are as follows: absorbent flow rate is 15 L / h, feeding time is 140s; EO material flow rate is 6L / h, feeding time is 110s; and the seventh threshold for controlling the pressure of the synthesis reactor is 0.25 MPa.

[0098] In some preferred embodiments, after the large-scale feeding stage, a heat preservation control is performed. This heat preservation control includes closing the AE feed valve, ME feed valve, and absorbent feed valve; controlling the EO feed valve to continuously add feed at a preset flow rate until the small-scale feeding stage begins; and adjusting the vent valve of the synthesis reactor to control the pressure to not exceed an eighth threshold. For example, the preset flow rate could be 20 L / h, the heat preservation time could be 15 minutes, and the eighth threshold could be 0.6 MPa.

[0099] In this application, the heat preservation control can maintain the temperature and material concentration of the reaction system after the large feeding is completed, and at the same time, the reaction rate is regulated by continuously adding EO to avoid sudden reaction stoppage or local side reactions; the pressure control of the vent valve can prevent the system pressure from being too high, ensuring reaction safety and product quality consistency.

[0100] In some preferred embodiments, after the small feeding stage is completed, a heat preservation control is performed. This heat preservation control includes closing the absorbent feed valve, controlling the EO feed valve to continuously add EO at a preset flow rate until the discharge stage begins, adjusting the vent valve of the synthesis reactor, and controlling the pressure to not exceed a ninth threshold. For example, the preset flow rate is 15 L / h, the heat preservation time is 10 minutes, and the ninth threshold is 0.58 MPa.

[0101] In this application, the heat preservation control maintains the balance of temperature and reaction kinetics in the reaction system after the small feeding is completed. The continuous addition of EO ensures that the reaction is fully completed and avoids uneven reaction or material residue at the end. The control of the pressure threshold further ensures the safety of the reaction process and provides stable conditions for the subsequent discharge stage.

[0102] S270: During the cold material stage, control the cooling system to turn on the cooling water to cool the mixture in the reactor to below the cooling threshold.

[0103] In this step, the main reaction is stopped, and the reaction mixture is rapidly cooled to a safe temperature and the temperature required for post-processing. During cooling, the rate of temperature drop of the solution is monitored to prevent equipment blockage or abnormal stirring load due to shrinkage or crystallization.

[0104] S280: During the feeding stage, feeding is performed according to the fourth preset configuration.

[0105] In some specific implementations, the fourth preset configuration includes controlling the nitrogen pressurization valve to pressurize the mixture, ensuring the pressure does not exceed the tenth threshold; and activating steam heating to control the temperature of the mixture within a second preset temperature range. For example, controlling the nitrogen pressurization valve maintains a certain positive pressure within the reactor. The pressure does not exceed the tenth threshold, for example, 0.4 MPa. Pressurization prevents materials from being drawn into the pipeline under negative pressure or causing gas backflow, while maintaining system tightness and ensuring safe subsequent operations. Pressure threshold interlocking prevents overpressure and avoids damage to the reactor or pipelines. Regarding steam heating control: the steam valve is activated to heat the mixture, controlling the temperature of the reactor mixture within a second preset temperature range, for example, 50–55°C. Principle and function: By appropriately heating the mixture, the reaction mixture reaches a suitable temperature range for discharge or cooling operations, ensuring material flowability and smooth subsequent operations, while reducing the impact of post-reaction temperature fluctuations on product quality.

[0106] In a preferred embodiment of the present invention, the control method further includes abnormal risk monitoring and control measures:

[0107] In the pretreatment stage: The system first controls the steam valve of the AE reactor to heat the AE material to the first set temperature, while simultaneously closing the vent valve of the AE reactor and opening the nitrogen valve for pressurization. During this process, the temperature sensor monitors the reactor temperature in real time. When the temperature exceeds the upper limit or falls below the lower limit, the system automatically closes the steam valve and sounds an alarm. The pressure sensor monitors the pressure inside the reactor. When the pressure approaches or exceeds the first threshold, the vent valve automatically opens to release pressure, and the pressurization operation stops. Abnormal flow or valve malfunction will trigger automatic stop of feeding and an alarm. Simultaneously, the stirring status is monitored by the stirring sensor. If stirring stops or malfunctions, the system will pause heating and pressurization operations and issue an alarm to prompt manual intervention.

[0108] During the feeding stage: The system starts the synthesis reactor and connects it to the AE reactor. The system opens the AE feed valve to add a preset volume of AE material to the synthesis reactor, then closes the AE feed valve and opens the mother liquor feed valve to add a preset volume of mother liquor. Throughout this process, the flow meter monitors the AE and mother liquor feed rates in real time. If the deviation exceeds the set limit, the corresponding valve automatically stops and an alarm is triggered. If the temperature exceeds the second set upper limit, steam heating is automatically paused and cooling is initiated. If the pressure exceeds the second threshold, the vent valve is automatically adjusted to release pressure. If the stirring status is abnormal, the system pauses all feeding and triggers an alarm to ensure thorough mixing of materials and prevent localized overheating or abnormal pressure.

[0109] During the absorbent stage: The absorbent and EO feed valves of the synthesis reactor are controlled according to the first preset configuration, adding absorbent and EO materials in batches while maintaining the reactor temperature within the first preset temperature range. Flow meters monitor the flow rate of each feed item; if the flow rate deviates from the set value, the valve automatically stops and an alarm is triggered. Pressure sensors monitor the pressure to ensure it does not exceed a third threshold; if it does, the vent valve automatically adjusts. Abnormal stirring is monitored to ensure uniform mixing; if stirring stops or becomes unstable, the system pauses feeding and triggers an alarm to prevent localized overheating or substrate accumulation.

[0110] During the large-scale feeding phase: The system controls the batch addition of AE, ME, absorbent, and EO according to the second preset configuration. Flow meters monitor the flow rate of each material in real time, automatically stopping the corresponding valve and triggering an alarm if the flow rate deviates from the set value. Feeding is automatically paused and cooling is initiated when the temperature exceeds the set range; the vent valve automatically opens to release pressure when the pressure exceeds the sixth threshold. Stirring monitoring ensures uniform mixing; when stirring stops or malfunctions, the system pauses all feeding and triggers an alarm.

[0111] During the heat preservation and control phase after the large-scale feeding is completed, the system closes the AE, ME, and absorbent feed valves, and controls the EO feed valve to continuously add EO at a preset flow rate until the small-scale feeding phase begins. The vent valve of the synthesis reactor is adjusted to maintain the pressure below the eighth threshold. During this phase, abnormal EO flow will trigger automatic feed stoppage and an alarm. If the temperature exceeds the set upper limit or falls below the lower limit, the system will automatically adjust the steam or cooling. If stirring stops or malfunctions, the system will pause feeding and trigger an alarm to ensure a stable reaction.

[0112] During the small-scale feeding stage: The system adds absorbent and EO materials in batches according to the third preset configuration. The flow meter monitors the flow of each valve in real time. If the flow deviates from the set value, the valve automatically stops and an alarm is triggered. If the temperature exceeds the set range, cooling is automatically initiated or feeding is paused. If the pressure exceeds the seventh threshold, the vent valve is adjusted to release pressure. Stirring monitoring ensures that the materials are fully mixed. When stirring stops or malfunctions, the system pauses feeding and triggers an alarm to prevent local accumulation or overheating.

[0113] During the heat preservation and control phase after the initial feeding, the absorbent feed valve is closed, and EO is continuously added at a preset flow rate until the discharge phase begins. The pressure of the vent valve in the synthesis reactor is adjusted to not exceed the ninth threshold. If the EO flow rate is abnormal, the temperature exceeds the limit, or stirring stops, the system automatically stops feeding and triggers an alarm. Simultaneously, cooling or venting measures are adjusted to ensure a stable and safe final reaction.

[0114] During the cooling stage: The system controls the cooling water flow rate to cool the mixture in the reactor below the cooling threshold. Temperature monitoring ensures that the cooling target is achieved; in case of abnormal flow or cooling system failure, the backup pump is activated or an alarm is triggered. Pressure monitoring ensures normal pressure; when stirring stops, the system pauses cooling operation and triggers an alarm to ensure uniform mixture temperature and prevent localized overheating or overpressure.

[0115] During the feeding phase: The system feeds materials according to the fourth preset configuration. The flow meter monitors the feeding rate, and feeding automatically stops and an alarm is triggered if the rate deviates from the set value. When the pressure exceeds the safety threshold, the vent valve automatically opens to release pressure and the feeding operation is paused. If stirring stops or malfunctions, the system pauses feeding and triggers an alarm to ensure smooth and safe feeding and prevent overflow or equipment damage.

[0116] Based on the above embodiments, this application also provides a control system for the synthesis of sodium hydrosulfite, the control system comprising:

[0117] The acquisition module is used to acquire production start instructions, which include control configurations for the pretreatment stage, feeding stage, absorption liquid stage, heat preservation stage, large feeding stage, small feeding stage, cold material stage and discharge stage.

[0118] The control module is used to execute the control configuration of steps S210 to S280 as shown in the control method above, according to the production start command.

[0119] Based on the above embodiments, this application also provides an electronic device, which includes multiple functional modules; the multiple functional modules interact with each other to realize the functions performed by the electronic device in the various methods described in the embodiments of this application. The multiple functional modules can be implemented based on software, hardware, or a combination of software and hardware, and the multiple functional modules can be arbitrarily combined or divided based on specific implementations.

[0120] Based on the above embodiments, this application also provides an electronic device, which includes at least one processor and at least one memory, wherein the at least one memory stores computer program instructions, and when the electronic device is running, the at least one processor performs the functions performed by the electronic device in the various methods described in the embodiments of this application.

[0121] Based on the above embodiments, this application also provides a computer program product, which includes a computer program (also referred to as code or instructions) that, when run, causes a computer to perform the methods described in the embodiments of this application.

[0122] Based on the above embodiments, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a computer, causes the computer to perform the methods described in the embodiments of this application.

[0123] Based on the above embodiments, this application also provides a chip for reading computer programs stored in a memory to implement the methods described in the embodiments of this application.

[0124] Based on the above embodiments, this application provides a chip system including a processor for supporting a computer device in implementing the methods described in the embodiments of this application. In one possible design, the chip system further includes a memory for storing necessary programs and data of the computer device. This chip system may be composed of chips or may include chips and other discrete devices. Those skilled in the art will understand that the embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0125] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0126] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0127] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0128] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of protection of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0129] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0130] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0131] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "at least one" refers to one or more, and the term "multiple" refers to two or more, unless otherwise expressly defined.

[0132] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method of a sodium hydrosulfite synthesis, characterized by, The control method comprises the following steps: obtaining a production start instruction, the production start instruction comprising control configurations of a pretreatment stage, a feeding stage, an absorbent stage, a holding stage, a large feeding stage, a small feeding stage, a cold material stage and a discharging stage; according to the production start instruction, the following control configurations are executed: in the pretreatment stage, the AE reaction kettle is controlled to heat the AE material to a first set temperature, the vent valve of the AE reaction kettle is closed and the nitrogen valve is opened for pressurization; in the feeding stage, the synthesis kettle is started, the synthesis kettle is communicated with the AE reaction kettle, the AE feeding valve of the synthesis kettle is opened, a preset volume of AE material is added to the synthesis kettle, after the AE feeding valve is closed, the mother liquor feeding valve of the synthesis kettle is opened, a preset volume of mother liquor is added to the synthesis kettle, the vent valve of the synthesis kettle is adjusted to control the pressure to be not more than a first threshold value, and the steam valve of the synthesis kettle is opened to heat to a second set temperature, the vent valve of the synthesis kettle is adjusted in the heating process to control the pressure to be not more than a second threshold value; in the absorbent stage, the absorbent feeding valve and the EO feeding valve of the synthesis kettle are controlled according to a first preset configuration, the absorbent and the EO material are added to the synthesis kettle in batches according to the first preset configuration, in the absorbent stage, the temperature of the synthesis kettle is controlled to be maintained in a first preset temperature range, and the vent valve of the synthesis kettle is adjusted throughout the process to control the pressure to be not more than a third threshold value; in the holding stage, the synthesis kettle is controlled to be maintained at a third set temperature for a preset holding time, and the EO feeding valve is controlled to continuously add the EO material at a preset flow rate, and the vent valve of the synthesis kettle is adjusted throughout the process to control the pressure to be not more than a fourth threshold value; in the large feeding stage, the AE feeding valve, the ME feeding valve, the absorbent feeding valve and the EO feeding valve of the synthesis kettle are controlled according to a second preset configuration, the AE material, the ME material, the absorbent and the EO material are added to the synthesis kettle in batches according to the second preset configuration, and the vent valve of the synthesis kettle is adjusted throughout the process according to the second preset configuration to control the pressure; in the small feeding stage, the absorbent feeding valve and the EO feeding valve of the synthesis kettle are controlled according to a third preset configuration, the absorbent and the EO material are added to the synthesis kettle according to the third preset configuration, and the vent valve of the synthesis kettle is adjusted throughout the process according to the third preset configuration to control the pressure; in the cold material stage, the cooling system is controlled to be opened to cool the mixture in the reaction kettle to below a cooling threshold value; in the discharging stage, discharging is performed according to a fourth preset configuration.

2. The control method according to claim 1, characterized in that: the first preset configuration comprises a plurality of feeding configuration parameters for batch addition, each feeding configuration parameter comprising an absorbent flow rate, a corresponding absorbent feeding time, an EO material flow rate, a corresponding EO feeding time and a temperature threshold value of the synthesis kettle.

3. The control method according to claim 1, characterized in that: The second preset configuration includes a plurality of large feeding configuration parameters for batch feeding, each of which includes AE material flow, corresponding AE feeding time, ME material flow, corresponding ME feeding time, absorbent flow, corresponding absorbent feeding time, EO material flow, corresponding EO feeding time, and a sixth threshold value for controlling the pressure of the synthesis kettle.

4. The control method for the synthesis of sodium hydrosulfite according to claim 1, characterized in that: The third preset configuration includes a plurality of small feeding configuration parameters for batch feeding, each of which includes absorbent flow, corresponding absorbent feeding time, EO material flow, corresponding EO feeding time, and a seventh threshold value for controlling the pressure of the synthesis kettle.

5. The control method for the synthesis of sodium hydrosulfite according to claim 1, characterized in that: After the completion of the large feeding stage, a holding control is further performed, which includes closing the AE feeding valve, the ME feeding valve, and the absorbent feeding valve, controlling the EO feeding valve to continuously feed at a preset flow rate until entering the small feeding stage, adjusting the vent valve of the synthesis kettle, and controlling the pressure not to exceed an eighth threshold value; After the completion of the small feeding stage, a holding control is further performed, which includes closing the absorbent feeding valve, controlling the EO feeding valve to continuously feed at a preset flow rate until entering the discharging stage, adjusting the vent valve of the synthesis kettle, and controlling the pressure not to exceed a ninth threshold value.

6. The control method for the synthesis of sodium hydrosulfite according to claim 1, characterized in that: The fourth preset configuration includes controlling the nitrogen pressurizing valve to pressurize, controlling the pressure not to exceed a tenth threshold value, and opening the steam to warm up, controlling the temperature of the mixture to be within a second preset temperature range.

7. A control system for the synthesis of sodium hydrosulfite, characterized in that it comprises: The control system comprises: an acquisition module configured to acquire a production start instruction, the production start instruction including control configurations of a pretreatment stage, a feeding stage, an absorbent stage, a holding stage, a large feeding stage, a small feeding stage, a cold material stage, and a discharging stage; a control module configured to execute the following control configurations according to the production start instruction: in the pretreatment stage, controlling the steam valve of the AE reactor to heat the AE material to a first set temperature, closing the vent valve of the AE reactor, and opening the nitrogen valve to pressurize; in the feeding stage, controlling the synthesis kettle to start, the synthesis kettle being connected to the AE reactor; opening the AE feeding valve of the synthesis kettle to feed a preset volume of AE material into the synthesis kettle; after closing the AE feeding valve, opening the mother liquor feeding valve of the synthesis kettle to feed a preset volume of mother liquor into the synthesis kettle; adjusting the vent valve of the synthesis kettle to control the pressure not to exceed a first threshold value, while opening the steam valve of the synthesis kettle to warm up to a second set temperature, adjusting the vent valve of the synthesis kettle during the warming-up process to control the pressure not to exceed a second threshold value; in the absorbent stage, controlling the absorbent feeding valve and the EO feeding valve of the synthesis kettle according to a first preset configuration to batch feed absorbent and EO material into the synthesis kettle according to the first preset configuration; in the absorbent stage, controlling the temperature of the synthesis kettle to be within a preset temperature range, and adjusting the vent valve of the synthesis kettle to control the pressure not to exceed a third threshold value throughout the process; In the holding stage, the synthesizer is controlled to keep at the third set temperature for a preset holding time, and the EO feeding valve is controlled to keep the EO material added at a preset flow rate, and the vent valve of the synthesizer is controlled to keep the pressure not more than the fourth threshold value; In the large feeding stage, the AE feeding valve, the ME feeding valve, the absorbent feeding valve and the EO feeding valve of the synthesizer are controlled to open and close according to the second preset configuration, and the AE material, the ME material, the absorbent and the EO material are added into the synthesizer in batches according to the second preset configuration; meanwhile, the vent valve of the synthesizer is controlled according to the second preset configuration; In the small feeding stage, the absorbent feeding valve and the EO feeding valve of the synthesizer are controlled to open and close according to the third preset configuration, and the absorbent and the EO material are added into the synthesizer according to the third preset configuration; meanwhile, the vent valve of the synthesizer is controlled according to the third preset configuration; In the cooling stage, the cooling system is controlled to open the cooling water to cool the mixture in the reactor to below the cooling threshold value; In the discharging stage, the discharging is performed according to the fourth preset configuration.

8. An electronic device, comprising: The computer readable storage medium stores instructions, when running on the computer, to make the computer execute the control method.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores instructions, when running on the computer, to make the computer execute the control method.

10. A computer program product comprising instructions, characterized in that, The computer readable storage medium stores instructions, when running on the computer, to make the computer execute the control method.

Images