Control method and system for producing calcium hydroxide, electronic equipment and storage medium

Abstract

The invention discloses a control method for producing calcium hydroxide, which comprises the following steps: a solvent control unit adjusts the real-time flow of a solvent pump according to the target water content of a product and the current specific surface area of the product; the material conveying control unit adjusts the real-time conveying amount of the materials according to the conveying amount; the drying control unit adjusts the heating air supply device according to the initial temperature, the current water content of the product and the current dryer outlet temperature. Feedback control is performed on the production process according to a plurality of detection results, so that the production process can be accurately controlled, and the quality of a calcium hydroxide product is improved. The invention further discloses a system for implementing the method, electronic equipment and a computer readable storage medium.

Description

Technical Field

[0001] The present invention relates to the technical field of calcium hydroxide preparation, and in particular to a control method, system, electronic equipment and storage medium for producing calcium hydroxide. Background Art

[0002] Calcium hydroxide is a white powdery solid with the chemical formula Ca(OH)2, commonly known as slaked lime or hydrated lime. Its aqueous solution is called clear lime water. Calcium hydroxide has the general properties of an alkali and is a strong alkali. Calcium hydroxide is a binary strong alkali, but it is only slightly soluble in water. Calcium hydroxide is widely used in industry. For example, industrial-grade calcium hydroxide is widely used in sewage treatment, acidic water neutralization, flue gas desulfurization, waste incineration and other fields; food-grade calcium hydroxide is widely used in food additives, synthesis of calcium stearate, calcium cyclohexane, calcium lactate, calcium citrate and other high-end organic chemical synthesis fields; high-quality industrial-grade calcium hydroxide is used in new coatings, chemical synthesis, leather manufacturing and other industries. At present, domestic calcium hydroxide production lines adopt basic control, which is controlled according to one or two detection indicators, and the product quality is poor. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a control method, system, electronic device and storage medium for producing calcium hydroxide. The technical problem to be solved by the present invention is achieved by the following technical solutions:

[0004] A first aspect of an embodiment of the present invention provides a control method for producing calcium hydroxide, comprising the following steps:

[0005] The solvent control unit adjusts the real-time flow rate of the solvent pump and determines the real-time solvent amount per unit material according to the target water content of the product, the current water content of the product and the current specific surface area of ​​the product; wherein the solvent includes water;

[0006] The material conveying control unit adjusts the real-time material conveying amount according to the maximum conveying amount and the current conveying amount; wherein the material is calcium oxide;

[0007] The drying control unit adjusts the real-time temperature and real-time air supply volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature;

[0008] The current water content of the product, the current specific surface area of ​​the product, the current flow rate of the solvent pump, the current pore volume of the product, the current delivery volume, and the current dryer outlet temperature are obtained by detection during production by the production equipment based on the benchmark solvent pump flow rate, benchmark material delivery volume, benchmark temperature, and benchmark air supply volume;

[0009] The solvent control unit, the material conveying control unit and the drying control unit are all PID controllers.

[0010] In one embodiment of the present invention, the method further comprises:

[0011] The solvent control unit determines the base solvent amount per unit material according to the target water content of the product;

[0012] The material conveying control unit determines the reference material conveying amount according to the maximum conveying amount;

[0013] The solvent control unit also determines a reference solvent pump flow rate according to the reference solvent amount per unit material and the reference material delivery amount;

[0014] The drying control unit determines a reference temperature and a reference air supply volume of the heating and air supply device according to a target dryer outlet temperature.

[0015] In one embodiment of the present invention, the solvent control unit adjusts the real-time flow rate of the solvent pump according to the target water content of the product, the current water content of the product and the current specific surface area of ​​the product, including:

[0016] The solvent control unit determines whether the difference between the target water content of the product and the current water content of the product is less than zero and whether the difference between the current specific surface area of ​​the product and the target specific surface area is less than zero;

[0017] If the difference between the target water content of the product and the current water content of the product is less than zero, and the difference between the current specific surface area of ​​the product and the target specific surface area is greater than zero, then reducing the real-time flow rate of the solvent pump;

[0018] If the difference between the target water content of the product and the current water content of the product is greater than zero, and the difference between the current specific surface area of ​​the product and the target specific surface area is greater than zero, then increasing the real-time flow rate of the solvent pump;

[0019] If the difference between the current specific surface area of ​​the product and the target specific surface area is less than zero, the real-time flow rate of the solvent pump is increased.

[0020] In one embodiment of the present invention, the method further comprises:

[0021] The solvent control unit determines whether the difference between the current third-stage digester temperature and the first target temperature is less than zero;

[0022] If it is less than zero, the real-time flow rate of the solvent pump is reduced;

[0023] or the solvent control unit determines whether the difference between the current digester exhaust gas temperature and the second target temperature is less than zero;

[0024] If it is less than zero, the real-time flow rate of the solvent pump will be reduced.

[0025] In one embodiment of the present invention, the material conveying control unit adjusts the real-time material conveying amount according to the maximum conveying amount and the current conveying amount, including:

[0026] The material conveying control unit determines whether the difference between the maximum conveying amount and the current conveying amount is less than zero;

[0027] If it is less than, reduce the real-time material delivery volume;

[0028] The drying control unit adjusts the real-time temperature and real-time air supply volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature, including:

[0029] The drying control unit determines whether the current moisture content of the product is greater than the target moisture content of the product;

[0030] If it is greater than, the real-time temperature and real-time air supply volume of the heating and air supply device are increased, and the real-time temperature is less than the initial temperature;

[0031] When the drying control unit determines that the current dryer outlet temperature is greater than the initial temperature, the real-time temperature and the real-time air supply volume of the heating and air supply device are reduced.

[0032] A second aspect of an embodiment of the present invention provides a control system for producing calcium hydroxide, comprising:

[0033] A solvent control unit, used to adjust the real-time flow rate of the solvent pump and determine the real-time solvent amount per unit material according to the target water content of the product, the current water content of the product and the current specific surface area of ​​the product; wherein the solvent includes water;

[0034] A material conveying control unit is used to adjust the real-time material conveying amount according to the maximum conveying amount and the current conveying amount; wherein the material is calcium oxide;

[0035] A drying control unit, used to adjust the real-time temperature and real-time air supply volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature;

[0036] The current water content of the product, the current specific surface area of ​​the product, the current flow rate of the solvent pump, the current pore volume of the product, the current delivery volume, and the current dryer outlet temperature are obtained by detection during production by the production equipment based on the benchmark solvent pump flow rate, benchmark material delivery volume, benchmark temperature, and benchmark air supply volume;

[0037] The solvent control unit, the material conveying control unit and the drying control unit are all PID controllers.

[0038] A third aspect of an embodiment of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a control method for producing calcium hydroxide provided in the first aspect of an embodiment of the present invention is implemented.

[0039] A fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, a control method for producing calcium hydroxide provided in the first aspect of an embodiment of the present invention is implemented.

[0040] Beneficial effects of the present invention:

[0041] The present invention detects the current water content of the product, the current specific surface area of ​​the product, the current flow rate of the solvent pump, the current pore volume of the product, the current delivery volume, and the current dryer outlet temperature during the production process, and then adjusts the outputs of the solvent control unit, the material delivery control unit, and the drying control unit according to the detection results, so as to feedback control the production process and perform precise control according to multiple detection results, thereby improving the quality of the calcium hydroxide product.

[0042] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0043] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0045] Figure 1 A schematic flow chart of a control method for producing calcium hydroxide provided in an embodiment of the present invention;

[0046] Figure 2 A block diagram of a control system for producing calcium hydroxide provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0048] like Figure 1 As shown, the first aspect of the embodiment of the present invention provides a control method for producing calcium hydroxide, comprising the following steps:

[0049] Step 11, the solvent control unit adjusts the real-time flow rate of the solvent pump and determines the real-time solvent amount per unit material according to the target moisture content of the product, the current moisture content of the product and the current specific surface area of ​​the product.

[0050] The solvent includes water

[0051] Step 12, the material conveying control unit adjusts the real-time material conveying amount according to the maximum conveying amount and the current conveying amount, wherein the material is calcium oxide.

[0052] Step 13, the drying control unit adjusts the real-time temperature and real-time air supply volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature;

[0053] Among them, the current water content of the product, the current specific surface area of ​​the product, the current flow rate of the solvent pump, the current pore volume of the product, the current delivery volume, and the current dryer outlet temperature are detected when the production equipment produces calcium hydroxide based on the benchmark solvent pump flow rate, benchmark material delivery volume and benchmark parameters.

[0054] The solvent control unit, the material conveying control unit and the drying control unit are all PID controllers.

[0055] In this embodiment, the production conditions of the production equipment are controlled by a solvent control unit, a material conveying control unit and a drying control unit, so that the solvent and calcium oxide undergo a hydration reaction to produce calcium hydroxide. At the same time, the current water content of the product, the current specific surface area of ​​the product, the current flow rate of the solvent pump, the current pore volume of the product, the current conveying volume, and the current dryer outlet temperature in the production process are detected, and then control and adjustment are performed based on these detection results. Thus, the production process can be accurately controlled, and indicators that do not meet the requirements can be adjusted in time, thereby improving the quality of calcium hydroxide, and increasing the pore volume and specific surface area of ​​calcium hydroxide.

[0056] In this embodiment, steps 11 to 13 are steps executed in parallel in no particular order. Before executing step 11, the production equipment has already produced calcium hydroxide under the initial control of the above-mentioned various units.

[0057] A second aspect of an embodiment of the present invention provides a control method for producing calcium hydroxide, comprising the following steps:

[0058] Step 21, the solvent control unit determines the baseline solvent amount per unit material according to the target moisture content of the product, the material conveying control unit determines the baseline material conveying amount according to the maximum conveying amount, the solvent control unit determines the baseline solvent pump flow rate according to the baseline solvent amount per unit material and the baseline material conveying amount, and the drying control unit determines the baseline temperature and baseline air supply volume of the heating and air supply device according to the target dryer outlet temperature.

[0059] In this embodiment, the digestion chemical reaction of converting calcium oxide into calcium hydroxide is called lime quenching reaction. The chemical equation of the reaction is: CaO+H2O=Ca(OH)2+15.3kcal / mole, and the molecular weight is 56+18=74. Therefore, according to the chemical equation, 74g of calcium hydroxide can be obtained by 56g of pure calcium oxide and 18g of water. Referring to the complete reaction, the solvent (water): calcium oxide: calcium hydroxide is approximately equal to 1:3:4. According to the relationship between SP3 and SP1, SP3=(SP1-1 / 3) / (SP1+1), SP1 can be calculated. Among them, SP3 is the target water content of the product, which is set by the process operation combined with the raw material analysis index, for example, it is usually 20%, and SP1 is the base solvent amount per unit material, for example, the amount of solvent required for one ton of calcium oxide material is 333 liters, SP1=333L / ton. The value of SP1 can be obtained by entering SP3 on the solvent control unit.

[0060] The material conveying control unit determines the reference material conveying volume SP5 according to the maximum conveying volume. The reference material conveying volume is the hourly flow rate, and the maximum conveying volume can be determined according to the maximum production capacity. Here, the hourly flow rate of the solvent can be calculated according to the reference material conveying volume SP5 and the reference solvent volume SP1 per unit material, that is, the reference solvent pump flow rate. The reference solvent pump flow rate = K*SP1*SP5, where K is an empirical coefficient used to compensate for the evaporation during the hydration process. Input SP5 on the IoT conveying control unit, and the solvent control unit obtains the reference solvent pump flow rate according to SP1 and SP5. The material conveying control unit sends the reference material conveying volume to the feeder, and the feeder feeds according to the reference material conveying volume. The solvent control unit sends the reference solvent pump flow rate to the solvent pump, and the solvent pump conveys the solvent according to the reference solvent pump flow rate.

[0061] The drying control unit determines the reference temperature and reference air volume of the heating and air supply device according to the target dryer outlet temperature SP4. The target dryer outlet temperature SP4 is input into the drying control unit, and the drying control unit calculates the reference temperature and reference air volume of the heating and air supply device according to the dryer outlet temperature and process heat exchange. The reference temperature and reference air volume are sent to the heating and air supply device, and the heating and air supply device works according to the temperature and air volume. The target dryer outlet temperature SP4 has a value range of 105-120°C.

[0062] Step 22, the production equipment produces calcium hydroxide based on the reference solvent pump flow, reference material delivery, reference temperature and reference air supply, and detects the current water content of the product CV2, the current specific surface area of ​​the product CV8, the current flow of the solvent pump CV6, the current pore volume of the product CV1, the current delivery volume CV7, and the current dryer outlet temperature CV3. At the same time, the current third-stage digester temperature CV9 and the current digester exhaust gas temperature CV10 are also detected. The flow rates in this embodiment are all hourly flow rates.

[0063] Step 23, the solvent control unit adjusts the real-time flow rate of the solvent pump and determines the real-time solvent amount per unit material according to the target moisture content of the product, the current moisture content of the product and the current specific surface area of ​​the product.

[0064] Wherein, the solvent includes water.

[0065] The specific steps of step 23 include step 231 to step 233:

[0066] Step 231, the solvent control unit determines whether the difference between the target water content SP3 of the product and the current water content CV2 of the product is less than zero and whether the difference between the current specific surface area CV8 of the product and the target specific surface area is less than zero.

[0067] Step 232, if the difference between the target water content SP3 of the product and the current water content CV2 of the product is less than zero, and the difference between the current specific surface area CV8 of the product and the target specific surface area is greater than zero, then control to reduce the real-time flow rate of the solvent pump.

[0068] In this step, if SP3-CV2 is less than zero and CV8-target specific surface area is greater than zero, it means that the current water content CV2 of the product is large, but the current specific surface area is large, so it is necessary to reduce the solvent input, and therefore, an instruction to reduce the flow rate is output to the solvent pump to control the flow rate of the solvent pump until SP3-CV2 is close to zero. Among them, calcium hydroxide products usually require that the specific surface area is as large as possible, and it does not affect even if it exceeds the target specific surface area. At this time, only SP3-CV2 needs to be concerned. Generally, the target specific surface area is the minimum value of the product specific surface area, which can be met in general production processes.

[0069] In this step, if SP3-CV2 is greater than zero and CV8-target specific surface area is greater than zero, it means that the current moisture content CV2 of the product is smaller than the target moisture content, the product performance is better, and no adjustment is required.

[0070] Step 233: If the difference between the current specific surface area CV8 of the product and the target specific surface area is less than zero, the real-time flow rate of the solvent pump is increased.

[0071] In this step, if CV8-target specific surface area is less than zero, it means that the current specific surface area of ​​the product is small and does not meet the requirements. In this case, regardless of the current water content CV2, the specific surface area needs to meet the requirements as the primary production condition. Therefore, it is necessary to increase the solvent input to increase the specific surface area until CV8-target specific surface area is close to zero.

[0072] Step 234, based on the current water content of the product CV2 and the relationship between SP3 and SP1, that is, the relationship between the water content and the amount of solvent per unit material, SP3 = (SP1-1 / 3) / (SP1+1), the value of SP3 is replaced by CV2, and the real-time amount of solvent per unit material can be calculated.

[0073] In a feasible embodiment, if the temperature of the third-stage digester or the digester waste gas temperature is abnormal during the production process, the solvent pump needs to be adjusted, and the third-stage digester temperature or the digester waste gas temperature condition takes precedence over the conditions of steps 231-233.

[0074] Specifically, the solvent control unit determines whether the difference between the current third-stage digester temperature CV9 and the first target temperature is less than zero. If so, the real-time flow rate of the solvent pump is reduced; if so, the real-time flow rate of the solvent pump is increased until the difference is close to zero.

[0075] Alternatively, the solvent control unit can also determine whether the difference between the current digester exhaust gas temperature CV10 and the second target temperature is less than zero. If so, the real-time flow rate of the solvent pump is reduced; if so, the real-time flow rate of the solvent pump is increased until the difference is close to zero.

[0076] Here, the first target temperature and the second target temperature are empirical value temperatures that meet general production requirements. During adjustment, a control instruction can be manually input directly into the solvent control unit to directly and effectively adjust the flow rate of the solvent pump.

[0077] The real-time flow rate of the solvent pump can be calculated based on K*real-time solvent volume per unit material*real-time material delivery volume.

[0078] Step 24, the material conveying control unit adjusts the real-time material conveying amount according to the maximum conveying amount and the current conveying amount, wherein the material is calcium oxide.

[0079] In this step, the material conveying control unit determines whether the difference SP5-CV7 between the maximum conveying volume SP5 and the current conveying volume CV7 is less than zero. If it is less than zero, the real-time material conveying volume is reduced; if it is greater than zero, the real-time material conveying volume is increased.

[0080] Step 25, the drying control unit adjusts the real-time temperature and real-time air volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature. The specific steps of this step are:

[0081] The drying control unit determines whether the current moisture content CV2 of the product is greater than the target moisture content of the product. For example, the process requires the target moisture content of the product to be within the range of 23-25%. If CV2>25%, the real-time temperature and real-time air supply volume of the heating and air supply device are increased in advance to reduce the system response time. At this time, the real-time temperature is always less than the initial temperature. The initial temperature of the example is 105-120°C. Increase the temperature to increase the evaporation of water.

[0082] When the drying control unit determines that the current dryer outlet temperature CV3 is greater than the initial temperature, the real-time temperature and the real-time air supply volume of the heating and air supply device are reduced.

[0083] In this step, the heating and air supply device is controlled to increase or decrease respectively through two different conditions.

[0084] In this embodiment, the solvent control unit, the material delivery control unit and the drying control unit are all PID controllers. Specifically, at time t: the input amount is i (t) , the output is 0 (t) , the deviation is err (t) =i (t) -0 (t) , U (t) =K p (err (t) +1 / T i *∫err (t) d t +T D d err(t) / d t ).

[0085] Assume that SP1-SP5 are input quantities, CV1-CV10 are output quantities (the output quantity includes the system output quantity of the production equipment, not the PID output), set an output target, and the feedback system returns the output value. If it is inconsistent with the target, there is an error. PID adjusts the input value according to this error until the output reaches the set value. Among them, the coefficient K of each control unit p different.

[0086] In this embodiment, steps 23 to 25 are executed in no particular order and can be executed in parallel and simultaneously. After adjustment, during the production of calcium hydroxide, the current water content of the product CV2, the current specific surface area of ​​the product CV8, the current flow rate of the solvent pump CV6, the current pore volume of the product CV1, the current delivery volume CV7, and the current dryer outlet temperature CV3 are detected. At the same time, the current third-stage digester temperature CV9 and the current digester exhaust gas temperature CV10 are also detected. The real-time parameters of each control unit are fed back to each control unit in real time for real-time adjustment, and the specific adjustment value can be calculated by each control unit.

[0087] like Figure 2 As shown, the third aspect of the embodiment of the present invention provides a control system for producing calcium hydroxide, comprising:

[0088] The solvent control unit 31 is used to adjust the real-time flow rate of the solvent pump and determine the real-time solvent amount per unit material according to the target water content of the product, the current water content of the product and the current specific surface area of ​​the product; wherein the solvent includes water;

[0089] The material conveying control unit 32 is used to adjust the real-time conveying amount of the material according to the maximum conveying amount and the current conveying amount; wherein the material is calcium oxide;

[0090] A drying control unit 33, used to adjust the real-time temperature and real-time air supply volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature;

[0091] Among them, the current moisture content of the product, the current specific surface area of ​​the product, the current flow rate of the solvent pump, the current pore volume of the product, the current delivery volume, and the current dryer outlet temperature are detected by the production equipment during production based on the benchmark solvent pump flow rate, benchmark material delivery volume, benchmark temperature, and benchmark air supply volume;

[0092] The solvent control unit, the material conveying control unit and the drying control unit are all PID controllers.

[0093] In one embodiment of the present invention, the solvent control unit is further used to determine a reference solvent amount per unit material according to a target water content of the product;

[0094] The material conveying control unit is also used to determine a reference material conveying amount according to a maximum conveying amount;

[0095] The solvent control unit is further used to determine a reference solvent pump flow rate according to a reference solvent amount per unit material and a reference material delivery amount;

[0096] The drying control unit is also used to determine the reference temperature and reference air supply volume of the heating and air supply device according to the target dryer outlet temperature.

[0097] In one embodiment of the present invention, the solvent control unit adjusts the real-time flow rate of the solvent pump according to the target water content of the product, the current water content of the product and the current specific surface area of ​​the product, including:

[0098] The solvent control unit determines whether the difference between the target water content of the product and the current water content of the product is less than zero and whether the difference between the current specific surface area of ​​the product and the target specific surface area is less than zero;

[0099] If the difference between the target water content of the product and the current water content of the product is less than zero, and the difference between the current specific surface area of ​​the product and the target specific surface area is greater than zero, the real-time flow rate of the solvent pump is reduced;

[0100] If the difference between the target water content of the product and the current water content of the product is greater than zero, and the difference between the current specific surface area of ​​the product and the target specific surface area is greater than zero, the real-time flow rate of the solvent pump is increased;

[0101] If the difference between the current specific surface area of ​​the product and the target specific surface area is less than zero, the real-time flow rate of the solvent pump is increased.

[0102] In one embodiment of the present invention, the solvent control unit determines whether the difference between the current third-stage digester temperature and the first target temperature is less than zero;

[0103] If it is less than zero, the real-time flow rate of the solvent pump is reduced;

[0104] or the solvent control unit determines whether the difference between the current digester exhaust gas temperature and the second target temperature is less than zero;

[0105] If it is less than zero, the real-time flow rate of the solvent pump will be reduced.

[0106] In one embodiment of the present invention, the material conveying control unit adjusts the real-time material conveying amount according to the maximum conveying amount and the current conveying amount, including:

[0107] The material conveying control unit determines whether the difference between the maximum conveying amount and the current conveying amount is less than zero;

[0108] If it is less than, reduce the real-time material delivery volume;

[0109] The drying control unit adjusts the real-time temperature and real-time air volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature, including:

[0110] The drying control unit determines whether the current moisture content of the product is greater than the target moisture content of the product;

[0111] If it is greater than, the real-time temperature and real-time air supply volume of the heating and air supply device are increased, and the real-time temperature is less than the initial temperature;

[0112] When the drying control unit determines that the current dryer outlet temperature is greater than the initial temperature, the real-time temperature and the real-time air supply volume of the heating and air supply device are reduced.

[0113] A fourth aspect of an embodiment of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a control method for producing calcium hydroxide provided in the above-mentioned embodiment of the present invention is implemented.

[0114] A fifth aspect of an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of a control method for producing calcium hydroxide provided in the above-mentioned embodiment of the present invention are implemented.

[0115] The memory may include a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0116] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware systems.

[0117] The method provided in the embodiment of the present invention can be applied to electronic devices. Specifically, the electronic device can be: a desktop computer, a portable computer, an intelligent mobile terminal, a server, etc. This is not limited here, and any electronic device that can implement the present invention belongs to the protection scope of the present invention.

[0118] As for the system / electronic device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0119] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0120] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0121] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0122] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A control method for producing calcium hydroxide, characterized in that, The following steps are involved: The solvent control unit adjusts the real-time flow rate of the solvent pump and determines the real-time solvent amount per unit material according to the target water content of the product, the current water content of the product and the current specific surface area of ​​the product; wherein the solvent includes water; The material conveying control unit adjusts the real-time conveying amount of the material according to the maximum conveying amount and the current conveying amount; wherein the material is calcium oxide; The drying control unit adjusts the real-time temperature and real-time air supply volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature; The current water content of the product, the current specific surface area of ​​the product, the current flow rate of the solvent pump, the current pore volume of the product, the current delivery volume, and the current dryer outlet temperature are obtained by detection during production by the production equipment based on the benchmark solvent pump flow rate, benchmark material delivery volume, benchmark temperature, and benchmark air supply volume; The solvent control unit, the material conveying control unit and the drying control unit are all PID controllers.

2. The method according to claim 1, characterized in that The method further comprises: The solvent control unit determines the base solvent amount per unit material according to the target water content of the product; The material conveying control unit determines the reference material conveying amount according to the maximum conveying amount; The solvent control unit also determines a reference solvent pump flow rate according to the reference solvent amount per unit material and the reference material delivery amount; The drying control unit determines a reference temperature and a reference air supply volume of the heating and air supply device according to a target dryer outlet temperature.

3. The method according to claim 1, characterized in that The solvent control unit adjusts the real-time flow rate of the solvent pump according to the target water content of the product, the current water content of the product and the current specific surface area of ​​the product, including: The solvent control unit determines whether the difference between the target water content of the product and the current water content of the product is less than zero and whether the difference between the current specific surface area of ​​the product and the target specific surface area is less than zero; If the difference between the target water content of the product and the current water content of the product is less than zero, and the difference between the current specific surface area of ​​the product and the target specific surface area is greater than zero, then reducing the real-time flow rate of the solvent pump; If the difference between the target water content of the product and the current water content of the product is greater than zero, and the difference between the current specific surface area of ​​the product and the target specific surface area is greater than zero, then increasing the real-time flow rate of the solvent pump; If the difference between the current specific surface area of ​​the product and the target specific surface area is less than zero, the real-time flow rate of the solvent pump is increased.

4. The method according to claim 3, characterized in that The method further comprises: The solvent control unit determines whether the difference between the current third-stage digester temperature and the first target temperature is less than zero; If it is less than zero, the real-time flow rate of the solvent pump is reduced; or the solvent control unit determines whether the difference between the current digester exhaust gas temperature and the second target temperature is less than zero; If it is less than zero, the real-time flow rate of the solvent pump will be reduced.

5. The method according to claim 1, characterized in that The material conveying control unit adjusts the real-time material conveying amount according to the maximum conveying amount and the current conveying amount, including: The material conveying control unit determines whether the difference between the maximum conveying amount and the current conveying amount is less than zero; If it is less than, reduce the real-time material delivery volume; The drying control unit adjusts the real-time temperature and real-time air supply volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature, including: The drying control unit determines whether the current moisture content of the product is greater than the target moisture content of the product; If it is greater than, the real-time temperature and real-time air supply volume of the heating and air supply device are increased, and the real-time temperature is less than the initial temperature; When the drying control unit determines that the current dryer outlet temperature is greater than the initial temperature, the real-time temperature and the real-time air supply volume of the heating and air supply device are reduced.

6. A control system for producing calcium hydroxide, characterized in that, include: A solvent control unit, used to adjust the real-time flow rate of the solvent pump and determine the real-time solvent amount per unit material according to the target water content of the product, the current water content of the product and the current specific surface area of ​​the product; wherein the solvent includes water; A material conveying control unit is used to adjust the real-time material conveying amount according to the maximum conveying amount and the current conveying amount; wherein the material is calcium oxide; A drying control unit, used to adjust the real-time temperature and real-time air supply volume of the heating and air supply device according to the initial temperature, the current moisture content of the product and the current dryer outlet temperature; The current water content of the product, the current specific surface area of ​​the product, the current flow rate of the solvent pump, the current pore volume of the product, the current delivery volume, and the current dryer outlet temperature are obtained by detection during production by the production equipment based on the benchmark solvent pump flow rate, benchmark material delivery volume, benchmark temperature, and benchmark air supply volume; The solvent control unit, the material conveying control unit and the drying control unit are all PID controllers.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the control method for producing high specific surface calcium hydroxide as described in any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method for producing high specific surface calcium hydroxide according to any one of claims 1 to 5 is implemented.

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