An automatic control method, system, equipment and medium for a series refining unit

Abstract

An automatic control method, system, equipment, and medium for a series refiner unit are disclosed, relating to the field of automatic control. The method includes the following steps: acquiring pulp demand information; configuring the operating mode of the series refiner unit based on the pulp demand information; determining the operating parameters of the pulping process based on the refiner unit's operating mode and acquiring time-of-use electricity price information, the operating parameters including at least the energy consumption per unit time of the pulper and the energy consumption per unit time of the refiner unit; establishing an operating energy consumption model for the pulping process based on the operating parameters and time-of-use electricity price information; optimizing the operating energy consumption model to minimize energy consumption; and planning the start-up and shutdown states of the series refiner unit and pulper in subsequent operating time units of the pulping process based on the optimization results. By adopting the technical solution provided in this application, the equipment involved in the pulping process can be better controlled, thereby utilizing the time-of-use electricity pricing system to reduce the total energy cost of the pulping process.

Description

Technical Field

[0001] This application relates to the field of automatic control, and in particular to an automatic control method, system, equipment and medium for a series-type pulping unit. Background Technology

[0002] In the papermaking process, the pulping process is the process of converting fiber raw materials into pulp. In the pulping process, the transported fiber raw materials are usually converted into pulp in the order of pulper - pre-refining tank - refiner - post-refining tank - loading tank. The pulp is then transported to the paper machine and finally formed in the paper machine to be manufactured into paper rolls.

[0003] Unlike the continuous production of paper machines, the pulping process in most paper mills is intermittent. In order to reduce the total energy consumption cost of the pulping process, on-site workers will control the start and stop of the equipment based on my country's time-of-use electricity pricing system.

[0004] However, relying solely on the experience of on-site workers to control the equipment involved in the pulping process is clearly not precise enough, leading to problems such as poor timeliness and insufficient accuracy. Currently, there is an urgent need for a more accurate automatic control method to manage the equipment involved in the pulping process, thereby better utilizing time-of-use electricity pricing to reduce the total energy consumption cost of the pulping process. Summary of the Invention

[0005] In order to better control the equipment involved in the pulping process and thereby reduce the total energy consumption cost of the pulping process by utilizing the time-of-use electricity pricing system, this application provides an automatic control method, system, equipment and medium for a series pulping unit.

[0006] In a first aspect, this application provides an automatic control method for a series-connected pulping unit, the method comprising the following steps:

[0007] Obtain pulp demand information;

[0008] Configure the working mode of the series-connected pulping unit according to the pulp demand information;

[0009] The working parameters of the pulping process are determined according to the working mode of the pulping unit and the time-of-use electricity price information is obtained. The working parameters include at least the energy consumption of the pulper per unit time and the energy consumption of the pulping unit per unit time.

[0010] An operational energy consumption model for the pulping process is established based on the operating parameters and the time-of-use electricity price information.

[0011] The energy consumption model is optimized to minimize energy consumption, and the start-up and shutdown status of the series-connected pulping unit and pulper is planned in several subsequent operating time units in the pulping process based on the optimization results.

[0012] By adopting the above technical solution, the working mode of the series-connected refiner unit is configured according to the personnel's requirements for pulp quality. Then, the working parameters of the pulping process are determined based on the working mode of the refiner unit to establish an operating energy consumption model corresponding to the working mode of the refiner unit. The operating energy consumption model is optimized to minimize energy consumption in order to plan the start-up and shutdown status of the series-connected refiner unit and pulper in several subsequent operating time units in the pulping process. This completes the control of the equipment involved in the pulping process and makes better use of the time-of-use electricity pricing system to reduce the total energy consumption cost of the pulping process.

[0013] Optionally, the series-connected refining unit includes a primary refiner and a secondary refiner. The inlet of the primary refiner is connected to the outlet of the pre-refining tank. The outlet of the primary refiner is connected to the inlet of the secondary refiner via a first outlet channel and to the inlet of the post-refining tank via a second outlet channel. The outlet of the secondary refiner is connected to the inlet of the post-refining tank via a third outlet channel. A first solenoid valve is installed on the first outlet channel, a second solenoid valve is installed on the second outlet channel, and a third solenoid valve is installed on the third outlet channel. The first solenoid valve, the second solenoid valve, and the third solenoid valve control the connection status of the first outlet channel, the second outlet channel, and the third outlet channel, respectively.

[0014] By adopting the above technical solution, the tandem refiner unit is composed of a primary refiner and a secondary refiner connected in series. The first, second, and third pulp outlet channels are controlled by the first, second, and third solenoid valves respectively, allowing personnel to arbitrarily determine the flow direction of the pulp and complete the control of the pulp flow direction inside the tandem refiner unit.

[0015] Optionally, the pulping unit operating mode configured according to the pulp demand information specifically includes:

[0016] Obtain a first output pulp quality range, which is used to describe the overall fiber state of the pulp after passing through the first-stage refiner;

[0017] Obtain a second output pulp quality range, which is used to describe the overall fiber state of the pulp after it has passed through the primary refiner and the secondary refiner simultaneously;

[0018] The required pulp quality for the paper machine is determined based on the pulp demand information.

[0019] The required pulp quality range is determined based on the first output pulp quality range and the second output pulp quality range; the working mode of the pulping unit is controlled based on the required pulp quality range, so as to control the opening and closing states of the first solenoid valve, the second solenoid valve and the third solenoid valve.

[0020] By adopting the above technical solution, the operating modes of the tandem refiner unit are configured according to the required pulp quality range. In different operating modes, the opening and closing states of each solenoid valve differ, thus determining the pulp processing method within the tandem refiner unit. Different processing methods directly affect the fiber state of the pulp; therefore, based on the configuration of the operating modes, personnel can adjust and control the fiber state of the pulp according to actual needs.

[0021] Optionally, controlling the opening and closing states of the first, second, and third solenoid valves according to the required pulp quality range to configure the working mode of the pulping unit specifically includes:

[0022] When the required pulp quality is within the first output pulp quality range, the series-connected pulping unit enters the first working mode. In the first working mode, the first solenoid valve is closed and the second solenoid valve is open.

[0023] When the required pulp quality is within the second output pulp quality range, the series-connected pulping unit enters the second working mode. In the second working mode, the second solenoid valve is closed, and the first solenoid valve and the third solenoid valve are open.

[0024] Optionally, the working parameters for determining the pulping process based on the working mode of the pulping unit specifically include:

[0025] Obtain the first unit time energy consumption of the primary refiner and the second unit time energy consumption of the secondary refiner;

[0026] When the series-connected pulping unit is in the first working state, the energy consumption per unit time is taken as the energy consumption per unit time of the pulping unit.

[0027] When the series-connected pulping unit is in the second working state, the sum of the first unit time energy consumption and the second unit time working energy consumption is taken as the unit time working energy consumption of the pulping unit.

[0028] By adopting the above technical solution, when the tandem refiner unit is in its first operating state, the pulp fiber state changes only under the action of the primary refiner. Therefore, the unit's energy consumption per unit time is determined by the first unit time energy consumption of the primary refiner. When the tandem refiner unit is in its second operating state, the pulp fiber state changes under the simultaneous action of the primary and secondary refiners. Therefore, the unit's energy consumption per unit time is the sum of the first unit time energy consumption of the primary refiner and the second unit time energy consumption of the secondary refiner. Accurately determining the unit's energy consumption per unit time based on the difference in operating modes provides an accurate data foundation for subsequent optimization to minimize energy consumption.

[0029] Optionally, the energy consumption model for the pulping process established based on the operating parameters and the time-of-use electricity price information specifically includes:

[0030] The operating energy consumption model is established based on the operating parameters and the time-of-use electricity price information. Specifically, the operating energy consumption model is as follows:

[0031]

[0032] Where Z is the energy consumption cost of the pulping process, a k b represents the start-up and shutdown status of the pulper in the k-th operating time unit. k The start-up and shutdown status of the series-connected pulping unit in the k-th operating time unit is given by e, where e is the energy consumption of the pulper per unit time. i The energy consumption per unit time of the pulping unit is defined as follows: when i = 1, it indicates that the series-connected pulping unit is in the first operating state; when i = 2, it indicates that the series-connected pulping unit is in the second operating state. Let $\frac{ ... This represents the time-of-use electricity price for the pulper during the kth operating time unit.

[0033] By adopting the above technical solution, an operational energy consumption model was constructed based on time-of-use electricity price information and current operating parameters, which accurately described the operational energy consumption cost of the pulping process.

[0034] Optionally, the process of finding the minimum energy consumption in the aforementioned operating energy consumption model specifically includes:

[0035] The objective function is determined based on the operating energy consumption model, and the objective function is the minimum energy consumption cost of the operating energy consumption model; the loading status of the pre-grind tank, post-grind tank and slurry tank is obtained;

[0036] Determine the constraints based on the loading status;

[0037] The objective function is optimized for minimum energy consumption using a preset optimization algorithm, with the constraints acting as constraints during the optimization process.

[0038] By adopting the above technical solution, for the pulping process, since there are upper and lower limits for pulp loading in the pre-grinding tank, post-grinding tank, and sizing tank, the objective function is constrained based on the loading status of the pre-grinding tank, post-grinding tank, and sizing tank. This ensures that the final minimum energy consumption plan will not cause the pre-grinding tank, post-grinding tank, and sizing tank to be fully loaded or empty during execution, so that the pulping process can operate normally.

[0039] A second aspect of this application provides an automatic control system for a series-connected pulping unit, the system comprising the following modules:

[0040] The demand information acquisition module is used to acquire pulp demand information;

[0041] The working mode configuration module is used to configure the working mode of the series-connected refiner unit according to the pulp demand information; the working parameter determination module is used to determine the working parameters of the pulping process and obtain time-of-use electricity price information according to the working mode of the refiner unit, wherein the working parameters include at least the energy consumption of the pulper per unit time and the energy consumption of the refiner unit per unit time.

[0042] An energy consumption model building module is used to build an operational energy consumption model for the pulping process based on the operating parameters and the time-of-use electricity price information.

[0043] The energy consumption model optimization module is used to optimize the operating energy consumption model to minimize energy consumption, and to plan the start-up and shutdown status of the series-connected pulping unit and pulper in several subsequent operating time units in the pulping process based on the optimization results.

[0044] In a third aspect of this application, an electronic device is provided;

[0045] The electronic device includes a processor, a memory, a user interface, and a network interface. The memory is used to store instructions, the user interface and the network interface are used to communicate with other devices, and the processor is used to execute the instructions stored in the memory to enable the electronic device to perform an automatic control method for a series-connected pulping unit.

[0046] A fourth aspect of this application provides a computer-readable storage medium;

[0047] The computer-readable storage medium stores instructions that, when executed, perform an automatic control method for a series-connected pulping unit.

[0048] In summary, one or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0049] 1. Configure the working mode of the series-connected refiner unit according to the personnel's requirements for pulp quality, and then determine the working parameters of the pulping process based on the working mode of the refiner unit to establish an operating energy consumption model corresponding to the working mode of the refiner unit. Perform minimum energy consumption optimization on the operating energy consumption model to plan the start and stop status of the series-connected refiner unit and pulper in several subsequent operating time units in the pulping process, thereby completing the control of the equipment involved in the pulping process, making better use of the time-of-use electricity pricing system to reduce the total energy consumption cost of the pulping process.

[0050] 2. The series-connected pulping unit consists of a primary pulper and a secondary pulper connected in series. The first, second, and third pulp outlet channels are controlled by a first solenoid valve, a second solenoid valve, and a third solenoid valve, respectively. This allows personnel to arbitrarily determine the direction of pulp flow and control the pulp flow within the series-connected pulping unit.

[0051] 3. Based on time-of-use electricity pricing information and current operating parameters, an operational energy consumption model was constructed, providing an accurate description of the operational energy consumption cost of the pulping process. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the pulping process provided in the embodiments of this application.

[0053] Figure 2 This is a schematic flowchart of an automatic control method for a series-connected pulping unit provided in an embodiment of this application.

[0054] Figure 3 This is a schematic diagram of the structure of a series-connected pulping unit in the pulping process provided in the embodiments of this application.

[0055] Figure 4 This is a schematic diagram of the structure of an automatic control system for a series-connected pulping unit disclosed in an embodiment of this application.

[0056] Figure 5 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application.

[0057] Explanation of reference numerals in the attached diagram: 1. Pulper; 2. Pre-refining tank; 3. Tandem refining unit; 31. Primary refiner; 32. Secondary refiner; 4. Post-refining tank; 5. Loading tank; 6. Paper machine; 7. First pulp outlet channel; 71. First solenoid valve; 8. Second pulp outlet channel; 81. Second solenoid valve; 9. Third pulp outlet channel; 91. Third solenoid valve; 401. Demand information acquisition module; 402. Working mode configuration module; 403. Working parameter determination module; 404. Energy consumption model establishment module; 405. Energy consumption model optimization module; 500. Electronic equipment; 501. Processor; 502. Communication bus; 503. User interface; 504. Network interface; 505. Memory. Detailed Implementation

[0058] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0059] In the description of the embodiments of this application, the words "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design that is described as "for example" or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Rather, the use of the words "for example" or "for instance" is intended to present the relevant concepts in a specific manner.

[0060] In the description of the embodiments of this application, the term "multiple" means two or more. For example, multiple systems means two or more systems, and multiple screen terminals means two or more screen terminals. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0061] The technical solution provided in this application can be applied to the pulping process in papermaking, as shown in the reference. Figure 1 In the pulping process, the delivered fiber raw materials are usually converted into pulp in the order of pulper 1 - pre-refining tank 2 - refiner - post-refining tank 4 - loading tank 5. The pulp is then conveyed to paper machine 6 and finally formed in paper machine 6 to be manufactured into paper rolls.

[0062] Some paper mills, when performing the pulping process, do not use a single refiner, but rather multiple refiners connected in series to further refine the fiber bundles and fibers in the pulp. A series refiner unit 3 includes multiple refiners, each with its outlet connected to the inlet of the next refiner. This allows the pulp, after the first refinement, to be transported to the next refiner for further fiber bundle refinement. This alters the dispersion, refinement, and uniformity of the fiber bundles and fibers in the pulp, improving pulp uniformity and texture, and ultimately enhancing the quality and performance of the paper.

[0063] For the pulping process, due to the presence of the pre-grinding tank 2, post-grinding tank 4 and pulping tank 5, some pulp can be temporarily stored, so the pulper 1 and the refiner can work intermittently, thereby reducing the overall energy consumption of the pulping process.

[0064] Based on the intermittent operation mode of pulper 1 and refiner, the start-up and shutdown status of pulper 1 and refiner can be controlled using a time-of-use electricity pricing system, thereby reducing the energy consumption cost of the pulping process. (Refer to...) Figure 2 This application provides an automatic control method for a series-connected pulping mill unit 3, which specifically includes the following steps:

[0065] S1: Obtain pulp demand information.

[0066] Specifically, pulp demand information is a description by papermakers of the specific properties of the pulp they wish to obtain. In one feasible embodiment of this application, the specific properties of the pulp are described through two dimensions: pulp fineness and pulp dispersion. Specifically, pulp fineness refers to the diameter of the fibers in the pulp, and pulp dispersion refers to the degree and uniformity of fiber dispersion in the pulp.

[0067] The fineness and dispersion of pulp are described by specific quantitative values. Based on these two dimensions, pulp demand information is obtained.

[0068] S2: Configure the working mode of the series-connected refining unit 3 according to the pulp demand information.

[0069] Specifically, refer to Figure 3The series-connected refining unit 3 consists of a primary refining mill 31 and a secondary refining mill 32 connected in series. The inlet of the primary refining mill 31 is connected to the outlet of the pre-refining tank 2. The outlet of the primary refining mill 31 is connected to the inlet of the secondary refining mill 32 through the first outlet channel 7 and to the inlet of the post-refining tank 4 through the second outlet channel 8. The outlet of the secondary refining mill 32 is connected to the inlet of the post-refining tank 4 through the third outlet channel 9. A first solenoid valve 71 is installed on the first outlet channel 7, a second solenoid valve 81 is installed on the second outlet channel 8, and a third solenoid valve 91 is installed on the third outlet channel 9. The first solenoid valve 71, the second solenoid valve 81, and the third solenoid valve 91 control the connection status of the first outlet channel 7, the second outlet channel 8, and the third outlet channel 9, respectively.

[0070] The first solenoid valve 71, the second solenoid valve 81, and the third solenoid valve 91 establish a communication connection with the control equipment. After receiving control signals sent by the control equipment, they switch between open and closed states according to the control signals. When the first solenoid valve 71 is open, the first pulp outlet channel 7 is open, and the pulp can be transported to the second-stage refiner 32 through the first pulp outlet channel 7 after being processed by the primary refiner 31. When the first solenoid valve 71 is closed, the first pulp outlet channel 7 is blocked, and the pulp cannot be transported to the second-stage refiner 32 through the first pulp outlet channel 7 after being processed by the primary refiner 31. Similarly, the same applies to the second solenoid valve 81 and the third solenoid valve 91. The opening and closing state of the second solenoid valve 81 controls whether the second pulp outlet channel 8 is open or closed, which directly determines whether the pulp can be transported to the second refiner 32 after being processed by the primary refiner 31. The opening and closing state of the third solenoid valve 91 controls whether the third pulp outlet channel 9 is open or closed, which directly determines whether the pulp can be transported to the post-refinement tank 4 after being processed by the second refiner 32.

[0071] After obtaining the pulp demand information, the first output pulp quality range and the second output pulp quality range are obtained respectively. The first output pulp quality range is used to describe the overall fiber state of the pulp after passing through the primary refiner 31, and the second output pulp quality range is used to describe the overall fiber state of the pulp after passing through both the primary refiner 31 and the secondary refiner 32. Due to the configuration of the aforementioned series-connected pulping unit 3, by controlling each solenoid valve, the pulp can be processed by the primary refiner 31 alone, or by both the primary refiner 31 and the secondary refiner 32 simultaneously. This results in the pulp fineness being less than that of the pulp processed only by the primary refiner 31, while the pulp dispersion being greater than that of the pulp processed only by the primary refiner 31. Therefore, the pulp fineness described in the second output pulp quality range should be less than that described in the first output pulp quality range, and the pulp dispersion described in the second output pulp quality range should be less than that described in the first output pulp quality range. Of course, the first output pulp quality range and the second output pulp quality range are entirely determined by the machine properties of the primary refiner 31 and the secondary refiner 32. In one feasible embodiment of this application, the first output pulp quality range and the second output pulp quality range can be obtained by laboratory experimental measurement.

[0072] Based on the pulp demand information, determine the required pulp quality that the personnel want to obtain after the pulping process, and determine the range of the required pulp quality. Configure the working mode of the series-connected pulping unit 3 according to the range of the required pulp quality to obtain the pulp that the personnel want to obtain.

[0073] When the required pulp quality is within the first output pulp quality range, the tandem refiner unit 3 is set to the first operating mode. In the first operating mode, the first solenoid valve 71 is closed to prevent pulp from flowing to the secondary refiner 32, and the second solenoid valve 81 is opened to directly deliver the pulp to the post-refinement tank 4. In the first operating mode, the pulp is delivered to the post-refinement tank 4 after only being processed and ground by the primary refiner 31, and the secondary refiner 32 is in a stopped state.

[0074] When the required pulp quality is within the second output pulp quality range, the tandem refiner unit 3 is set to the second operating mode. In the second operating mode, the second solenoid valve 81 is closed to prevent pulp from flowing directly to the post-refinement tank 4 through the second pulp outlet channel 8, while the first solenoid valve 71 and the third solenoid valve 91 are opened, allowing the pulp to flow from the primary refiner 31 to the secondary refiner 32, and finally into the post-refinement tank 4. In the second operating mode, the pulp is simultaneously processed and refined by the primary refiner 31 and the secondary refiner 32 before being transported to the post-refinement tank 4. At this time, both the primary refiner 31 and the secondary refiner 32 are in the start-up state.

[0075] S3: Determine the working parameters of the pulping process based on the working mode of the pulping unit and obtain time-of-use electricity price information.

[0076] Specifically, the operating parameters of the pulping process include the energy consumption per unit time of pulper 1 and the energy consumption per unit time of refiner unit. The energy consumption per unit time of pulper 1 refers to the energy consumption data of pulper 1 within one unit of time, and the energy consumption per unit time of refiner unit refers to the energy consumption data of refiner unit within one unit of time. This energy consumption data can be directly obtained through the monitoring of pulper 1 and refiner unit. It should be noted that the unit time mentioned above is the minimum time cycle for one operation of pulper 1 and refiner unit, and it is also the start-stop adjustment cycle of pulper 1 and refiner unit. The specific value of the unit time is determined according to the specific quantity of raw materials transported in the pulping process.

[0077] The unit time energy consumption of the pulping unit consists of the first unit time energy consumption of the primary pulping mill 31 and the second unit time energy consumption of the secondary pulping mill 32. When the series-connected pulping unit 3 is in the first working state, only the primary pulping mill 31 is working, and the first unit time energy consumption is taken as the unit time energy consumption of the pulping unit. When the series-connected pulping unit 3 is in the second working state, the primary pulping mill 31 and the secondary pulping mill 32 work simultaneously, and the sum of the first unit time energy consumption and the second unit time energy consumption is taken as the unit time energy consumption of the pulping unit.

[0078] Time-of-use (TOU) electricity pricing information is obtained based on the TOU pricing system, which determines electricity prices according to supply and demand and changes in energy costs at different times. Under the TOU pricing system, a day is divided into different time periods, each with its own electricity price. The TOU pricing information is determined by the TOU pricing system in the geographical location of the paper mill, and typically, TOU prices change on a 1-hour cycle.

[0079] S4: Establish an operational energy consumption model for the pulping process based on operating parameters and time-of-use electricity pricing information.

[0080] Specifically, the energy consumption model for the pulping process can be represented as:

[0081]

[0082] Where Z represents the energy consumption cost of the pulping process, and a k b represents the start-up and shutdown status of pulper 1 in the k-th operating time unit. k This represents the start-up and shutdown status of the series-connected pulping unit 3 in the k-th operating time unit, where e is the energy consumption of pulper 1 per unit time. i The energy consumption per unit time of the pulping unit is given by: When i = 1, it indicates that the series-connected pulping unit 3 is in the first operating state, and the energy consumption per unit time is the energy consumption per unit time of the first unit time. When i = 2, it indicates that the series-connected pulping unit 3 is in the second operating state, and the energy consumption per unit time of the pulping unit is the sum of the energy consumption per unit time of the first unit time and the energy consumption per unit time of the second unit time. The time-of-use electricity price for pulper 1 operating in the kth operating time unit. The time-of-use electricity price for pulper 1 during the kth operating time unit.

[0083] S5: Perform minimum energy consumption optimization on the operating energy consumption model, and plan the start-up and shutdown status of the series-connected pulping mill and pulper in several subsequent operating time units in the pulping process based on the optimization results.

[0084] Specifically, the objective function is determined based on the constructed operational energy consumption model. To minimize the energy cost of the pulping process, the objective function is:

[0085] minZ;

[0086] After determining the objective function, it is necessary to determine the constraints on the objective function. In the pulping process, the constraints are the loading states of the pre-grinding tank 2, the post-grinding tank 4, and the loading tank 5. Taking the pre-grinding tank 2 as an example, in the pulping process, the liquid level in the pre-grinding tank 2 cannot be higher than the upper loading limit or lower than the lower loading limit. The same applies to the post-grinding tank 4 and the loading tank 5. Based on the above description, some constraints can be derived:

[0087] lower p ≤p k ≤upper p ;

[0088] lower q ≤q k ≤upper q ;

[0089] Where, p k To represent the slurry volume corresponding to the level of pre-mill tank 2 before the (k+1)th running time unit and after the kth running time unit, lower p The upper limit of the loading of pre-grinding pool 2 is the lower limit.p q is the upper limit of the loading capacity of the pre-grinding pool 2. k To represent the slurry volume corresponding to the level of the grinding tank 4 before the (k+1)th running time unit and after the kth running time unit, lower q The lower limit of the loading of the grinding pool 4 is upper. q This is the upper limit of the loading capacity of the grinding pool 4.

[0090] Furthermore, the mass of the pulp is conserved during the pulping process. Based on this conservation of pulp mass, another set of constraints can be derived:

[0091] p k =p k-1 +a k ·f a -b k ·f b ;

[0092] q k =q k-1 +b k ·f b -f d ;

[0093] Among them, f a f is the production flow rate of pulper 1. b f is the flow rate consumed by the series-connected refining unit 3. b The flow rate consumed by paper machine 6.

[0094] After determining the objective function and constraints, a preset optimization algorithm is used to optimize the objective function by minimizing energy consumption, thereby planning the start-up and shutdown states of the pulper 1 and the series-connected refiner unit 3 for each operating time unit. Specifically, the optimization algorithm can be any of the simplex method, greedy algorithm, gradient descent method, or genetic algorithm. The optimization algorithm needs to be determined according to the actual production scenario, which is existing technology and will not be elaborated here.

[0095] Reference Figure 4 This application also provides an automatic control system for a series refining unit, which specifically includes the following modules:

[0096] Demand information acquisition module 401 is used to acquire pulp demand information;

[0097] The working mode configuration module 402 is used to configure the working mode of the series-connected refiner unit 3 according to the pulp demand information; the working parameter determination module 403 is used to determine the working parameters of the pulping process and obtain the time-of-use electricity price information according to the working mode of the refiner unit. The working parameters include at least the energy consumption of the pulper 1 per unit time and the energy consumption of the refiner unit per unit time.

[0098] The energy consumption model building module 404 is used to build an operational energy consumption model for the pulping process based on working parameters and time-of-use electricity price information.

[0099] The energy consumption model optimization module 405 is used to optimize the minimum energy consumption of the operating energy consumption model and plan the start-up and shutdown status of the series-connected pulping unit 3 and pulper 1 in several subsequent operating time units in the pulping process based on the optimization results.

[0100] It should be noted that the above embodiments of the apparatus are only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process can be found in the method embodiments, which will not be repeated here.

[0101] This application also discloses an electronic device 500. (See reference...) Figure 5 , Figure 5 This is a schematic diagram of the structure of an electronic device 500 disclosed in an embodiment of this application. The electronic device 500 may include: at least one processor 501, at least one network interface 504, a user interface 503, a memory 505, and at least one communication bus 502.

[0102] The communication bus 502 is used to enable communication between these components.

[0103] The user interface 503 may include a display screen and a camera. Optionally, the user interface 503 may also include a standard wired interface and a wireless interface.

[0104] The network interface 504 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface).

[0105] The processor 501 may include one or more processing cores. The processor 501 connects to various parts of the server using various interfaces and lines, and performs various server functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in memory 505, and by calling data stored in memory 505. Optionally, the processor 501 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 501 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the content required for display; and the modem handles wireless communication. It is understood that the modem may also not be integrated into the processor 501 and may be implemented as a separate chip.

[0106] The memory 505 may include random access memory (RAM) or read-only memory. Optionally, the memory 505 may include a non-transitory computer-readable storage medium. The memory 505 may be used to store instructions, programs, code, code sets, or instruction sets. The memory 505 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-described method embodiments, etc.; the data storage area may store data involved in the above-described method embodiments, etc. Optionally, the memory 505 may also be at least one storage device located remotely from the aforementioned processor 501. (Refer to...) Figure 5 The memory 505, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and an application program for an automatic control method of a series-connected grinding mill unit 3.

[0107] exist Figure 5In the illustrated electronic device 500, the user interface 503 is mainly used to provide an input interface for the user and to acquire user input data; while the processor 501 can be used to call an application program stored in the memory 505 for an automatic control method of a series-connected grinding mill unit 3. When executed by one or more processors 501, the electronic device 500 performs one or more of the methods described in the above embodiments. It should be noted that, for the foregoing method embodiments, for the sake of simplicity, they are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0108] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0109] In the various embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of 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 service interface; the indirect coupling or communication connection between apparatuses or units may be electrical or other forms.

[0110] 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.

[0111] Furthermore, the functional units in the various embodiments of this application 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.

[0112] 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 device 505. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage device 505 and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage device 505 includes various media capable of storing program code, such as a USB flash drive, external hard drive, magnetic disk, or optical disk.

[0113] The above description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Other embodiments of this disclosure will be readily apparent to those skilled in the art upon consideration of the specification and the disclosure of practical truths.

[0114] This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described in this disclosure. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

Claims

1. A method for automatic control of a series refiner unit (3), characterized in that, The method comprises the following steps: Obtain pulp demand information; According to the pulp demand information, configure the pulp mill group working mode of the series pulp mill group (3), wherein the series pulp mill group (3) comprises a first-stage pulp mill (31) and a second-stage pulp mill (32), the pulp inlet of the first-stage pulp mill (31) is communicated with the pulp outlet of the pre-pulp pool (2), the pulp outlet of the first-stage pulp mill (31) is communicated with the pulp inlet of the second-stage pulp mill (32) through a first pulp outlet channel (7) and communicated with the pulp inlet of the post-pulp pool (4) through a second pulp outlet channel (8), the pulp outlet of the second-stage pulp mill (32) is communicated with the pulp inlet of the post-pulp pool (4) through a third pulp outlet channel (9), a first electromagnetic valve (71) is arranged on the first pulp outlet channel (7), a second electromagnetic valve (81) is arranged on the second pulp outlet channel (8), and a third electromagnetic valve (91) is arranged on the third pulp outlet channel (9), the first electromagnetic valve (71), the second electromagnetic valve (81), and the third electromagnetic valve (91) control the communication state of the first pulp outlet channel (7), the second pulp outlet channel (8), and the third pulp outlet channel (9) respectively, Wherein, in the step of configuring the pulp mill group working mode of the series pulp mill group (3) according to the pulp demand information, the specific steps comprise: Obtain a first output pulp quality interval, which is used to describe the overall fiber state of the pulp after passing through the first-stage pulp mill (31); Obtain a second output pulp quality interval, which is used to describe the overall fiber state of the pulp after passing through the first-stage pulp mill (31) and the second-stage pulp mill (32) at the same time; Determine the required pulp quality of the paper machine (6) according to the pulp demand information; Determine the interval of the required pulp quality according to the first output pulp quality interval and the second output pulp quality interval; control the pulp mill group working mode according to the interval of the required pulp quality, so as to control the opening and closing state of the first electromagnetic valve (71), the second electromagnetic valve (81), and the third electromagnetic valve (91), Wherein, in the step of controlling the opening and closing state of the first electromagnetic valve (71), the second electromagnetic valve (81), and the third electromagnetic valve (91) according to the interval of the required pulp quality, so as to configure the pulp mill group working mode, the specific steps comprise: When the required pulp quality is in the first output pulp quality interval, the series pulp mill group (3) enters a first working mode, in which the first electromagnetic valve (71) is closed, and the second electromagnetic valve (81) is opened; when the required pulp quality is in the second output pulp quality interval, the series pulp mill group (3) enters a second working mode, in which the second electromagnetic valve (81) is closed, and the first electromagnetic valve (71) and the third electromagnetic valve (91) are opened; According to the working mode of the pulper set, working parameters of the pulp preparation process are determined and time-of-use electricity price information is obtained, the working parameters at least including unit time working energy consumption of the pulper (1) and unit time working energy consumption of the pulper set; An operation energy consumption model of the pulp preparation process is established according to the working parameters and the time-of-use electricity price information; The operation energy consumption model is subjected to minimum energy consumption optimization, and start-stop states of the series pulper set (3) and the pulper (1) in subsequent several operation time units in the pulp preparation process are planned according to an optimization result.

2. The method of automatic control of a series refiner unit (3) according to claim 1, characterized in that, In the step of determining the working parameters of the pulp preparation process according to the working mode of the pulper set, the step specifically includes: A first unit time energy consumption of the primary pulper (31) and a second unit time energy consumption of the secondary pulper (32) are obtained; when the series pulper set (3) is in a first working state, the first unit time energy consumption is taken as the unit time working energy consumption of the pulper set; When the series pulper set (3) is in a second working state, a sum of the first unit time energy consumption and the second unit time working energy consumption is taken as the unit time working energy consumption of the pulper set.

3. The method of automatic control of a series refiner unit (3) according to claim 1, characterized in that, In the step of establishing the operation energy consumption model of the pulp preparation process according to the working parameters and the time-of-use electricity price information, the step specifically includes: The operation energy consumption model is established according to the working parameters and the time-of-use electricity price information, and the operation energy consumption model specifically is: wherein Z is the energy cost of the pulp-making process, a k is the start-stop condition of the pulper (1) in the kth operating time unit, b k is the start-stop condition of the series-connected refiner unit (3) in the kth operating time unit, e i is the energy consumption per unit time of the pulper (1), e is the time-of-use electricity price for the operation of the pulper (1) in the kth operating time unit, is the time-of-use electricity price for the operation of the pulper (1) in the kth operating time unit.

4. The method of automatic control of a series refiner unit (3) according to claim 3, characterized in that, In the step of subjecting the operation energy consumption model to minimum energy consumption optimization, the step specifically includes: A target function is determined according to the operation energy consumption model, the target function being a minimum value of energy consumption cost of the operation energy consumption model; loading states of a pre-pulping pool (2), a post-pulping pool (4) and a sizing pool (5) are obtained; Constraint conditions are determined according to the loading states; The minimum energy consumption optimization of the target function is performed through a preset optimization algorithm, and the constraint conditions are taken as constraints in the process of performing the minimum energy consumption optimization.

5. A system for automatic control of a series refiner unit, characterized in that The system includes: A demand information obtaining module (401) for obtaining paper pulp demand information; The working mode configuration module (402) is configured to configure a working mode of a series pulp refining unit (3) according to the pulp demand information, wherein the series pulp refining unit (3) comprises a first-stage pulp refining machine (31) and a second-stage pulp refining machine (32), a pulp inlet of the first-stage pulp refining machine (31) is communicated with a pulp outlet of a pre-refining pool (2), a pulp outlet of the first-stage pulp refining machine (31) is communicated with a pulp inlet of the second-stage pulp refining machine (32) through a first pulp outlet channel (7) and communicated with a pulp inlet of a post-refining pool (4) through a second pulp outlet channel (8), a pulp outlet of the second-stage pulp refining machine (32) is communicated with the pulp inlet of the post-refining pool (4) through a third pulp outlet channel (9), a first electromagnetic valve (71) is arranged on the first pulp outlet channel (7), a second electromagnetic valve (81) is arranged on the second pulp outlet channel (8), and a third electromagnetic valve (91) is arranged on the third pulp outlet channel (9), and the first electromagnetic valve (71), the second electromagnetic valve (81), and the third electromagnetic valve (91) are respectively configured to control the communication state of the first pulp outlet channel (7), the second pulp outlet channel (8), and the third pulp outlet channel (9); The working parameter determination module (403) is configured to determine working parameters of a pulp making process according to the working mode of the pulp refining unit and obtain time-of-use electricity price information, wherein the working parameters at least include the working energy consumption per unit time of a pulper (1) and the working energy consumption per unit time of the pulp refining unit; The energy consumption model establishment module (404) is configured to establish an operation energy consumption model of the pulp making process according to the working parameters and the time-of-use electricity price information; The energy consumption model optimization module (405) is configured to perform minimum energy consumption optimization on the operation energy consumption model, and plan the start-stop state of the series pulp refining unit (3) and the pulper (1) in subsequent operation time units of the pulp making process according to the optimization result. In the step of configuring the working mode of the series pulp refining unit (3) according to the pulp demand information, the following steps are further included: obtaining a first output pulp quality interval, which is used to describe the overall fiber state of the pulp after passing through the first-stage pulp refining machine (31); obtaining a second output pulp quality interval, which is used to describe the overall fiber state of the pulp after passing through the first-stage pulp refining machine (31) and the second-stage pulp refining machine (32) at the same time; determining the required pulp quality of a paper machine (6) according to the pulp demand information; determining the interval in which the required pulp quality is located according to the first output pulp quality interval and the second output pulp quality interval; and controlling the working mode of the pulp refining unit according to the interval in which the required pulp quality is located, so as to control the opening-closing state of the first electromagnetic valve (71), the second electromagnetic valve (81), and the third electromagnetic valve (91). In the step of controlling the opening-closing state of the first electromagnetic valve (71), the second electromagnetic valve (81), and the third electromagnetic valve (91) according to the interval in which the required pulp quality is located, the following steps are further included: ​ ​ ​ When the required pulp quality is in the first output pulp quality interval, the series-connected refiner set (3) enters a first working mode, in which the first electromagnetic valve (71) is closed and the second electromagnetic valve (81) is opened; when the required pulp quality is in the second output pulp quality interval, the series-connected refiner set (3) enters a second working mode, in which the second electromagnetic valve (81) is closed and the first electromagnetic valve (71) and the third electromagnetic valve (91) are opened.

6. An electronic device, comprising: The electronic device (500) comprises a processor (501), a memory (505), a user interface (503) and a network interface (504), the memory (505) is configured to store instructions, the user interface (503) and the network interface (504) are configured to communicate with other devices, and the processor (501) is configured to execute the instructions stored in the memory (505) to enable the electronic device (500) to perform the method of any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium stores instructions which, when executed, perform the method steps of any one of claims 1-4.

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