A control method and control device for products with multiple raw material sources

Abstract

A control method and control device for a product with multiple raw material sources, the control method is applicable to at least two raw material sources, and comprises the following steps: (1) setting parameters according to the raw material sources, including: raw material feed amount and additive feed amount; (2) feeding according to the setting of step (1), monitoring the liquid level accumulation and flow accumulation in real time, and completing one batch of raw material feeding when the liquid level accumulation or flow accumulation meets the requirements; and starting the next batch of raw material feeding; (3) according to the setting of step (1), feeding additives in the batch where raw material feeding is completed. The control method realizes the automatic production of multiple raw material sources in intermittent chemical production, reduces the operation amount of production equipment personnel, and avoids production accidents caused by personnel instruction transmission errors or operation errors.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical industry, and relates to an intermittent production method, and in particular to a control method and a control device for a product with multiple raw material sources. Background Art

[0002] Intermittent chemical process usually refers to a process in which a limited amount of material is processed in one or more equipment according to a specified processing sequence to obtain a limited amount of product. Due to the flexible and changeable nature of intermittent chemical process, the source of raw materials may include different types or come from different batches, so it is necessary to set up relevant processes for the stable operation of intermittent chemical process.

[0003] In the intermittent chemical production process, one set of equipment may have multiple products. It is necessary to formulate a production plan for each shift in advance. The production plan may include the production tasks of multiple brands of products, and the raw materials of each production tank may be delivered from different devices. Therefore, in the production of products, at least one operator is required to pay attention to the relevant process parameters and switch to the next batch after the production of the current batch of products is completed. In this process, a series of valve switching, equipment start-stop and material addition are required. If the operator makes a mistake, it will cause personal safety and property losses.

[0004] CN 110590657A discloses a fully automatic and continuous production device and process for antioxidant RD. The process adopts a series of kettle-type reaction devices, and extracts materials in an overflowing manner to synthesize antioxidant RD in a one-step method. The entire process includes salt formation, polycondensation, neutralization, water separation, etc., which are all controlled by automatic instrument interlocking control, so that the production of antioxidant RD includes continuous feeding, continuous salt formation, continuous polycondensation, continuous neutralization and continuous water separation. The above process can realize continuous production and automatic control, reduce the number of personnel on the job, reduce the work intensity, and improve the stability of production and product quality. However, the above process needs to be improved a lot on the basis of existing equipment, and the cost is relatively high.

[0005] CN 111420712A discloses a device and method for continuously producing catalysts based on low-temperature coprecipitation method, the device comprises: a metal salt preparation kettle, a main reaction kettle, a secondary reaction kettle, a precipitant preparation kettle, a circulating refrigeration system, an automatic control system, a non-aqueous solvent storage tank and a water storage tank, realizing low-temperature continuous production of catalysts. The independent preparation kettle has heating and stirring functions, which is used for rapid dissolution of raw materials. At the same time, when the main and secondary reaction kettles are reacting, the independent preparation kettle can simultaneously prepare the next batch of materials; the circulating refrigeration system refrigerates the main and secondary reaction kettles at the same time. During the reaction process, the low-temperature precipitant can effectively offset the heat of precipitation reaction and the heat brought by stirring in the main reaction kettle, thereby improving the refrigeration efficiency of the main reaction kettle during the low-temperature coprecipitation reaction. However, the above device and method do not involve regulation when the raw material sources are different.

[0006] CN 111320168A discloses a device and method for producing graphite carbon material, wherein the device for producing graphite carbon material comprises the 1st to mth heating units and the 1st to nth coke towers, wherein m is any integer from 2 to n-1, and n is any integer greater than 3, wherein the nth coke tower is connected to at least two of the m heating units, and each of the n coke towers is connected to one or more separation towers, respectively, and the light wax oil pipelines of the one or more separation towers are connected to the mth heating unit, and the bottom materials of the one or more separation towers are discharged from the system through pipelines or partially discharged from the system and partially recycled back to the separation tower and optionally connected to the i-th heating unit at the bottom of the tower. The above device ensures the performance stability of the system by setting up multiple heating units, but does not involve regulation when the raw material sources are different.

[0007] Therefore, it is necessary to provide a control method and a control device for products with multiple raw materials so as to solve the problems of low efficiency and high manpower consumption in intermittent production of multiple raw materials and multiple production tanks in the prior art. Summary of the invention

[0008] The object of the present invention is to provide a control method and control device for products from multiple raw material sources, wherein the control method can realize the continuous production of intermittent chemical products from multiple raw material sources, reduce the operation workload of operators, and reduce the risk of production accidents caused by errors in the transmission of personnel instructions or operational errors.

[0009] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a control method for a product with multiple raw material sources, wherein the control method is applicable to at least two raw material sources and comprises the following steps:

[0011] (1) Setting parameters according to the raw material source, including: raw material feed amount and additive feed amount;

[0012] (2) feeding according to the setting of step (1), monitoring the liquid level accumulation and the flow accumulation in real time, and completing one batch of raw material feeding when the liquid level accumulation or the flow accumulation meets the requirements; and starting the next batch of raw material feeding;

[0013] (3) According to the setting of step (1), the additive feeding is carried out in the batch after the raw material feeding is completed.

[0014] The control method of the present invention is applicable to at least two raw material sources, for example, 2, 3, 4, 5, 6 or 8, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable. The "at least two raw material sources" is the "multiple raw material sources" of the present invention.

[0015] The control method provided by the present invention can automatically start the next batch of raw material feeding according to the set parameters of the raw material source after completing one batch of raw material feeding, and can ensure that the additive feeding and the raw material feeding are carried out independently; the additive feeding is automatically added according to the set additive feeding amount. Therefore, the control method provided by the present invention can realize the automatic production of products from multiple raw material sources according to the product plan, reduce the operation workload of operators, reduce the operation error rate and safety risks, and improve work efficiency.

[0016] The setting parameters of the present invention include but are not limited to production batch, reactor position number, raw material source, product brand, liquid level of the remaining product in the reactor, liquid level of the product without additives in the reactor, and the planned concentration of additives. The raw material feed amount that needs to be confirmed in the present invention is determined by parameters such as production batch, reactor position number, raw material source, product brand, and liquid level of the remaining product in the reactor. The additive feed amount is determined by parameters such as the liquid level of the product without additives in the reactor and the planned concentration of additives.

[0017] The liquid level cumulative amount described in step (2) of the present invention refers to the mass of raw material feed reacting to the liquid level change in the reaction tank; the flow cumulative amount described in step (2) of the present invention refers to the mass of raw material feed recorded by the flow meter during the feeding process.

[0018] After completing one batch of feeding in one group of reaction tanks, the present invention can directly start feeding in another group of reaction tanks. The feeding can be the same batch feeding or different batches feeding, as long as the raw material feeding amount meets the set parameters; while starting to feed in another group of reaction tanks, the reaction tank that has completed the raw material feeding can simultaneously carry out additive feeding, thereby improving the batching efficiency.

[0019] Preferably, the raw material feed amount in step (1) is calibrated by the liquid level.

[0020] The raw material feed amount is calibrated by liquid level in the present invention, which means that each liquid level in the reaction tank corresponds to a certain raw material mass. The raw material feed amount and the liquid level of the remaining product in the reaction tank can be directly obtained through the change of the liquid level.

[0021] Preferably, the raw material feed rate in step (1) is set as follows: Based on the product production plan and the initial liquid level L0, the final liquid level L Z .

[0022] The present invention does not specifically limit the method for measuring the liquid level. As a preferred technical solution, in order to facilitate the measurement and real-time monitoring of the liquid level, the method for measuring the liquid level is to use a liquid level meter for detection, thereby facilitating the operation of the operator.

[0023] Preferably, the additive feed amount is determined according to the raw material feed amount and the additive concentration.

[0024] The feed amount of the additive described in the present invention is determined according to the feed amount of the raw materials and the concentration of the additive, which means that according to the mass m0 of the material in the reaction tank without the addition of the additive, and the subsequent amount of the raw material added m1, after the raw material feeding is completed, the total amount of the material in the reaction tank with the addition of the additive M=m1+m2 can be obtained, and the addition amount of the additive is m=M×ρ, wherein ρ is the concentration of the additive.

[0025] Preferably, after one batch of raw material feeding in step (2) is completed and the next batch of raw material feeding is started, the flow cumulative amount is calibrated using the liquid level cumulative amount.

[0026] The present invention can avoid the defect of overflow of the reaction tank caused by operator's operation error by performing calibration after completing one batch of raw material feeding and starting the next batch of raw material feeding, thereby improving the safety of operation.

[0027] The liquid level accumulation in the present invention refers to the mass of raw material feed reflected by the liquid level change in the reaction tank; the flow accumulation in the present invention refers to the mass of raw material feed recorded by the flow meter during the feeding process. The completion of a batch of raw material feeding in the present invention refers to the real-time liquid level L P ≥L Z Or judge by the accumulated flow, when the real-time accumulated flow Q L ≥ Required raw material feed mass. When one of the above two conditions is met, the batch of raw material feeding is deemed to be completed, the next batch of feeding valves are opened and the current batch of feeding valves are closed, and it is determined whether calibration is required. If calibration is required, the liquid level cumulative amount is used to calibrate the flow cumulative amount.

[0028] Preferably, the accumulated liquid level is Q Y , the accumulated flow is Q L , Q Y -QL =Q Z , when Q Z / Q Y When ≥2%, use the liquid level cumulative amount to calibrate the flow cumulative amount.

[0029] When Q Z / Q Y ≥2%, the liquid level accumulation Q Y The flow meter is calibrated to meet the actual inflow quality standard, and the operator inputs the correct actual inflow raw material mass to facilitate the subsequent control of the additive feed quality.

[0030] The liquid level accumulation Q of the present invention Y It refers to the raw material feed mass corresponding to the change in liquid level when the raw material feed is stopped. L It refers to the raw material feed quality recorded by the flow meter during the raw material feeding cycle.

[0031] The present invention calibrates the flow cumulative amount through the liquid level cumulative amount and determines the raw material feeding end point, thereby improving the accuracy of multiple batches of feeding and reducing the operation error in the actual production process.

[0032] When the same reaction tank is fed with different raw material tanks, the cumulative flow rate Q L It refers to the sum of the raw material feed masses recorded by the flowmeters corresponding to different raw material tanks. When calibrating, the mass corresponding to the change in liquid level in the reaction tank is calibrated when the feed of different raw material tanks is completed.

[0033] Preferably, the control method includes stirring after step (3).

[0034] The stirring time and the stirring speed are set according to different raw material sources, and the present invention does not make too many limitations here.

[0035] In a second aspect, the present invention provides a control device for a product with multiple raw material sources, the control device comprising at least two raw material tanks, at least two reaction tanks, at least one additive storage tank and an industrial control device;

[0036] Each raw material tank is independently connected to at least two reaction tanks;

[0037] The additive storage tank is connected to at least two reaction tanks;

[0038] The industrial control device controls the raw material tank, the reaction tank and the additive storage tank to operate according to the control method described in the first aspect.

[0039] The number of raw material tanks in the control system is at least 2, for example, it can be 2, 3, 4, 5, 6, 7, 8 or 10, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0040] The number of reaction tanks in the control system is at least 2, for example, it can be 2, 3, 4, 5, 6, 7, 8 or 10, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0041] The number of the additive storage tanks in the control system is at least 1, for example, 1, 2, 3, 4, 5, 6, 8 or 10, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable. The specific number of additive storage tanks is determined by the type of additives to be added, and the present invention does not make too many restrictions.

[0042] The phrase “each raw material tank is independently connected to at least two reaction tanks” in the present invention means that the raw materials supplied by each raw material tank can enter each reaction tank in the control device.

[0043] The term “the additive storage tank is connected to at least two reaction tanks” in the present invention means that the additive in the additive storage tank can enter each reaction tank of the control system.

[0044] The control device also includes necessary pipes, valves and pumps for connecting the raw material tank, the reaction tank and the additive storage tank. Those skilled in the art can make reasonable settings according to the connection method and the operating logic of the control device, and the present invention does not make too many limitations.

[0045] Preferably, a stirring device is provided in the reaction tank.

[0046] The opening and closing of the stirring device is controlled by an industrial control device.

[0047] The discharge port of the raw material tank described in the present invention is independently provided with a flow meter, and the accumulated flow volume monitored by the flow meter is output to the industrial control device, and the opening and closing of the relevant valves are controlled by the industrial control device. The reaction tank described in the present invention is independently provided with a liquid level meter, and the liquid level meter monitors the liquid level change in the reaction tank to obtain the accumulated liquid level, and the accumulated liquid level monitored by the liquid level meter is output to the industrial control device, and the opening and closing of the relevant valves are controlled by the industrial control device.

[0048] Preferably, the industrial control device includes at least one processor, a memory, an input device and an output device.

[0049] Exemplarily, the processor, memory, input device and output device of the present invention are electrically connected.

[0050] The memory is used to store execution instructions of the processor. The memory stores instructions that can be executed by at least one processor. The instructions are executed by at least one processor so that the at least one processor can execute the control method of multi-raw material source products as described above.

[0051] The input device is used to input operating parameters to the processor, including but not limited to conventional input devices for setting parameters.

[0052] The output device is used to output the output result of the processor, including but not limited to conventional output devices such as a display screen for displaying the operating status of the industrial control device.

[0053] The memory, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as the program instructions / modules of the control method described in the first aspect. The processor executes various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory, that is, the control method described in the first aspect is realized. The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the control device described in the second aspect, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device or other non-volatile solid-state storage device. Exemplarily, the memory may optionally include a memory remotely arranged relative to the processor, and the remote memory may be connected to the device for executing the automatic production control method of multi-raw material source products through a network, and the above network includes but is not limited to any one or a combination of at least two of the Internet, an intranet, a local area network or a mobile communication network.

[0054] The input device can receive input user clicks, as well as user settings of the control method described in the first aspect and signal input related to function control. The output device includes but is not limited to display devices such as display screens. When the one or more modules are stored in the memory and are executed by the at least one processor, the control method described in the first aspect of the present invention is executed.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] The present invention automatically produces products from multiple raw material sources according to preset product production plans and preset control logic. The invention realizes the automatic production of multiple raw material sources and multiple brands of intermittent chemical products according to the production plan, reduces the operation workload of production equipment personnel, avoids production accidents caused by personnel command transmission or operation errors, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is a sequential function diagram of the control method provided in Example 1.

[0058] Figure 2 The control device for the multi-raw material source product provided in Example 2, wherein C1001 is the first-phase raw material tank, C2001 is the second-phase raw material tank, A1001 is the first reaction tank, A1002 is the second reaction tank, A1003 is the third reaction tank, A1004 is the fourth reaction tank, and T1001 is the additive storage tank. DETAILED DESCRIPTION

[0059] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0060] Example 1

[0061] This embodiment provides a control method for a product with multiple raw material sources. The control method is applicable to at least two raw material sources and includes the following steps:

[0062] (1) Set parameters according to the raw material source, including: raw material feed amount and additive feed amount; set the raw material feed amount as follows: according to the product production plan and the initial liquid level L0, obtain the end liquid level L Z ; The additive feed amount is determined according to the raw material feed amount and the additive concentration;

[0063] (2) feeding according to the setting of step (1), monitoring the liquid level cumulative amount and the flow cumulative amount in real time, and when one of the liquid level cumulative amount or the flow cumulative amount meets the requirement, one batch of raw material feeding is completed and the next batch of raw material feeding is started, and then the liquid level cumulative amount is used to calibrate the flow cumulative amount;

[0064] (3) According to the setting of step (1), the additive is fed in the batch after the raw material feeding is completed, and then stirred.

[0065] The feed amount of the additive in step (1) is determined based on the feed amount of the raw materials and the concentration of the additive. This means that based on the mass m0 of the material in the reaction tank without the addition of the additive, and the subsequent amount of the raw material added m1, after the raw material feeding is completed, the total amount of material in the reaction tank with the addition of the additive is M=m1+m2, and the amount of the additive added is m=M×ρ, where ρ is the concentration of the additive.

[0066] The flow accumulation in step (2) refers to the mass of the raw material feed recorded by the flow meter during the feeding process. The completion of a batch of raw material feed in the present invention refers to the real-time liquid level L P ≥L Z; or judge by the accumulated flow, when the real-time accumulated flow Q L ≥ Required raw material feed mass. When one of the above two conditions is met, the batch of raw material feed is deemed to be completed, and the liquid level cumulative amount is used to calibrate the flow cumulative amount. The liquid level cumulative amount is Q Y , the accumulated flow is Q L , Q Y -Q L =Q Z , when Q Z / Q Y ≥2%, the liquid level accumulation Q Y The flow meter is calibrated for the actual inflow quality standard, and the operator inputs the correct actual inflow raw material quality.

[0067] by Figure 1 Taking the control method of this embodiment as an example, Figure 1 is the sequential function diagram of the control method. The sequential function diagram corresponding to the control method is a layered structure with 2 branches, each of which can run simultaneously; each branch has 2 layers, and each layer has 2 independent sequential controls. The 2 branches correspond to the first-phase raw material source and the second-phase raw material source respectively; the number of layers is the number of batches that can be performed when the sequential control is running; each layer of independent sequential controls corresponds to the reaction tank.

[0068] After completing the input of the set parameters according to the production plan, the raw material source of each period will search for the first batch of reaction tanks in parallel, and start the corresponding period and reaction tank acceptance sub-sequence control. After the reaction tank has completed the acceptance, the next batch production tank will start the sub-sequence control. At the same time, the current reaction tank will start the corresponding additive sub-sequence control.

[0069] The control method provided in this embodiment can interconnect the raw material acceptance processes in different periods according to the plan, thereby reducing production accidents caused by personnel communication practices; by pre-setting production parameters, the complex product production process is completely completed through automation, reducing the workload of device operators and avoiding production accidents caused by personnel operation practices.

[0070] Example 2

[0071] This embodiment provides a control device for implementing the control method. The structural diagram of the control device is as follows: Figure 2 As shown, it includes 2 raw material tanks (C1001 and C2001), 4 reaction tanks (A1001, A1002, A1003 and A1004), 1 additive storage tank (T1001), industrial control device ( Figure 2 The invention also provides a method for manufacturing a raw material tank, a reaction tank and an additive storage tank, and provides a method for manufacturing the raw material tank, the reaction tank and the additive storage tank.

[0072] The first-stage raw material tank C1001 is independently connected to the first reaction tank A1001, the second reaction tank A1002, the third reaction tank A1003 and the fourth reaction tank A1004.

[0073] The second-phase raw material tank C2001 is independently connected to the first reaction tank A1001, the second reaction tank A1002, the third reaction tank A1003 and the fourth reaction tank A1004.

[0074] The additive storage tank T1001 is independently connected to the first reaction tank A1001, the second reaction tank A1002, the third reaction tank A1003 and the fourth reaction tank A1004.

[0075] The industrial control device controls the raw material tank, the reaction tank and the additive storage tank to operate according to the control method described in the first aspect.

[0076] In this embodiment, the discharge port of the raw material tank is independently provided with a flow meter, and the accumulated flow rate monitored by the flow meter is output to the industrial control device, and the opening and closing of the relevant valves are controlled by the industrial control device. In this embodiment, the reaction tank is independently provided with a liquid level meter, and the liquid level meter monitors the liquid level change in the reaction tank to obtain the accumulated liquid level, and the accumulated liquid level monitored by the liquid level meter is output to the industrial control device, and the opening and closing of the relevant valves are controlled by the industrial control device.

[0077] The industrial control device includes at least one processor, a memory, an input device and an output device, and the processor, the memory, the input device and the output device are electrically connected.

[0078] The memory is used to store execution instructions of the processor. The memory stores instructions that can be executed by at least one processor. The instructions are executed by at least one processor so that the at least one processor can execute the control method of multi-raw material source products as described above.

[0079] The input device is used to input operating parameters to the processor, including but not limited to conventional input devices for setting parameters.

[0080] The output device is used to output the output result of the processor, including but not limited to conventional output devices such as a display screen for displaying the operating status of the industrial control device.

[0081] By using the control device provided in this embodiment, operators of different stages can realize automated production through communication, operation and other steps, which improves the production efficiency of products and significantly reduces the number of quality accidents caused by misoperation.

[0082] In summary, the present invention automatically produces products from multiple raw material sources according to preset control logic by presetting product production plans. The invention realizes the automatic production of intermittent chemical products from multiple raw material sources and multiple brands according to the production plan, reduces the operation workload of production equipment personnel, avoids production accidents caused by personnel command transmission or operation errors, and improves work efficiency.

[0083] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention are within the protection scope and disclosure scope of the present invention.

Claims

1. A method for controlling products from multiple raw material sources, characterized in that: The control method is applicable to at least two raw material sources and comprises the following steps: (1) Setting parameters according to the raw material source, including: raw material feed amount and additive feed amount; (2) feeding according to the setting of step (1), monitoring the liquid level accumulation and the flow accumulation in real time, and completing one batch of raw material feeding when the liquid level accumulation or the flow accumulation meets the requirements; and starting the next batch of raw material feeding; The completion of a batch of raw material feeding means that the real-time liquid level L P ≥End point liquid level L Z Or judge by the accumulated flow, when the real-time accumulated flow Q L ≥ Required raw material feed quality; After completing the feeding of one batch of raw materials in step (2) and starting the feeding of the next batch of raw materials, the flow cumulative amount is calibrated using the liquid level cumulative amount; the liquid level cumulative amount is Q Y , the accumulated flow is Q L , Q Y -Q L =Q Z , when Q Z / Q Y When ≥2%, use the liquid level accumulation to calibrate the flow accumulation; The liquid level accumulation refers to the mass of raw material feed in the reaction tank caused by the liquid level change reaction; The cumulative flow rate refers to the mass of raw material feed recorded by the flow meter during the feeding process; (3) According to the setting of step (1), the additive feeding is carried out in the batch after the raw material feeding is completed.

2. The control method according to claim 1, characterized in that: The raw material feed amount in step (1) is calibrated by the liquid level.

3. The control method according to claim 2, characterized in that: In step (1), the raw material feed rate is set as follows: Based on the product production plan and the initial liquid level L0, the final liquid level L Z .

4. The control method according to claim 3, characterized in that: The additive feed amount is determined according to the raw material feed amount and the additive concentration.

5. The control method according to claim 1, characterized in that: The control method includes stirring after step (3).

6. A control device for products from multiple raw materials, characterized in that: The control device includes at least 2 raw material tanks, at least 2 reaction tanks, at least 1 additive storage tank and an industrial control device; Each raw material tank is independently connected to at least two reaction tanks; The additive storage tank is connected to at least two reaction tanks; The industrial control device controls the raw material tank, the reaction tank and the additive storage tank to operate according to the control method according to any one of claims 1-5.

7. The control device according to claim 6, characterized in that: A stirring device is arranged in the reaction tank.

8. The control device according to claim 6 or 7, characterized in that: The industrial control device includes at least one processor, a memory, an input device and an output device; The memory is used to store execution instructions of the processor; The input device is used to input operating parameters to the processor; The output device is used to output the output result of the processor.

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