CN112987803B - Calcium hydroxide feeding and water distribution control system and method and storage medium - Google Patents
Calcium hydroxide feeding and water distribution control system and method and storage medium Download PDFInfo
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- CN112987803B CN112987803B CN202110144704.6A CN202110144704A CN112987803B CN 112987803 B CN112987803 B CN 112987803B CN 202110144704 A CN202110144704 A CN 202110144704A CN 112987803 B CN112987803 B CN 112987803B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
- C04B2/08—Devices therefor
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Abstract
The invention provides a calcium hydroxide feeding and water distribution control system, a method and a storage medium, comprising a central control computer, a PLC (programmable logic controller), a belt scale control device, a transmission device and a water distribution output device connected with a water supply pipe; the central control computer is used for leading in a preset feeding amount of calcium oxide and a mixing proportion value of the material and the water; the PLC is used for calculating the water distribution amount of the material-water mixing ratio value according to the preset calcium oxide feeding amount to obtain the preset water distribution amount; the belt scale control device is used for obtaining the real-time feeding amount of the calcium oxide from the raw material bin through the preset feeding amount of the calcium oxide. The method does not need abundant field management experience of operators, reduces the technical threshold of the operators, solves the problems of insufficient intelligent automation degree of the calcium hydroxide production line and incapability of correcting the proportion of the raw materials and the water in real time in the prior art, saves manpower and material resources and increases the production efficiency.
Description
Technical Field
The invention mainly relates to the technical field of calcium hydroxide production, in particular to a calcium hydroxide feeding and water distribution control system, a calcium hydroxide feeding and water distribution control method and a storage medium.
Background
Calcium hydroxide, an inorganic compound, of the formula Ca (OH) 2, commonly known as slaked or hydrated lime. Is a white powdery solid, and after water is added, the white powdery solid presents an upper layer and a lower layer, the upper layer of water solution is called as clear lime water, and the lower layer of suspension is called as lime milk or lime slurry. The clear lime water at the upper layer can be used for detecting carbon dioxide, and the turbid lime milk at the lower layer is a building material. Calcium hydroxide is a strong base, has bactericidal and antiseptic properties, and has corrosive effects on skin and fabrics. Calcium hydroxide has wide industrial applications. It is a common building material and also used as a bactericide, a chemical raw material and the like.
1. In the prior art, the management and control of the mixing of the materials and the water in the calcium hydroxide production line require operators to have very rich field management experience.
2. In the prior art, the intelligent automation degree of a calcium hydroxide production line is insufficient, and the situations of more material and less water and less material and more water can occur in raw materials or water.
3. In the prior art, the labor intensity of calcium hydroxide staff is high, the staff pay attention to the conditions of raw materials and water all the time, more staff are needed, and the labor cost is high. Production requires frequent observation of the moisture content of the finished product.
4. In the calcium hydroxide control technology in the prior art, if personnel do not notice that water is more or less or the water is more or less, the possibility of overload and machine blockage of a digestion system is caused, and the production efficiency is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a calcium hydroxide feeding and water distribution control system, a calcium hydroxide feeding and water distribution control method and a storage medium.
The technical scheme for solving the technical problems is as follows: a calcium hydroxide feeding and water distribution control system comprises a central control computer, a PLC (programmable logic controller), a belt scale control device, a transmission device and a water distribution output device connected with a water supply pipe;
the central control computer is used for introducing a preset feeding amount of calcium oxide and a mixing proportion value of the material and the water;
the PLC is used for calculating the water distribution amount of the material-water mixing ratio value according to the preset calcium oxide feeding amount to obtain the preset water distribution amount;
the belt scale control device is used for obtaining the real-time calcium oxide feeding amount from the raw material bin through the preset calcium oxide feeding amount;
the water distribution output device is used for obtaining real-time water distribution from the water supply pipe through the preset water distribution;
and the transmission device is used for inputting the real-time feeding amount of the calcium oxide and the real-time water blending amount into the calcium hydroxide digestion device, so that a calcium hydroxide raw material is obtained through the configuration of the calcium hydroxide digestion device.
Another technical solution of the present invention for solving the above technical problems is as follows: a calcium hydroxide feed water distribution control method comprises the following steps:
leading in a preset feeding amount of calcium oxide and a mixing ratio value of the feeding amount and the water;
calculating the water distribution amount of the material-water mixing ratio value according to the preset feeding amount of the calcium oxide to obtain a preset water distribution amount;
obtaining the real-time feeding amount of calcium oxide from the raw material bin according to the preset feeding amount of calcium oxide;
obtaining a real-time water distribution amount from a water supply pipe through the preset water distribution amount;
and inputting the real-time feeding amount of the calcium oxide and the real-time water blending amount into a calcium hydroxide digestion device, thereby obtaining a calcium hydroxide raw material through the configuration of the calcium hydroxide digestion device.
Another technical solution of the present invention for solving the above technical problems is as follows: a calcium hydroxide feed water distribution control system comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor when executing the computer program implementing the calcium hydroxide feed water distribution control method as described above.
Another technical solution of the present invention for solving the above technical problems is as follows: a computer-readable storage medium storing a computer program which, when executed by a processor, implements a calcium hydroxide feed water distribution control method as described above.
The beneficial effects of the invention are: the method comprises the steps of calculating the water distribution quantity of a material-water mixing ratio value according to the preset calcium oxide feeding quantity to obtain the preset water distribution quantity, obtaining the real-time calcium oxide feeding quantity from a raw material bin according to the preset calcium oxide feeding quantity, obtaining the real-time water distribution quantity from a water supply pipe according to the preset water distribution quantity, and inputting the real-time calcium oxide feeding quantity and the real-time water distribution quantity into a calcium hydroxide digestion device, so that a calcium hydroxide raw material is obtained through the calcium hydroxide digestion device.
Drawings
FIG. 1 is a block diagram of a calcium hydroxide feed and water distribution control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a calcium hydroxide feed water distribution control system according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a single-loop control connection of a belt scale control device of a calcium hydroxide feed and distribution control system according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for controlling the distribution of water in calcium hydroxide feed according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a block diagram of a system for controlling distribution of calcium hydroxide feed water according to an embodiment of the present invention.
As shown in fig. 1, a calcium hydroxide feeding and water distribution control system comprises a central control computer, a PLC logic controller, a belt scale control device, a transmission device and a water distribution output device connected with a water supply pipe;
the central control computer is used for introducing a preset feeding amount of calcium oxide and a mixing proportion value of the material and the water;
the PLC is used for calculating the water distribution amount of the material-water mixing ratio value according to the preset calcium oxide feeding amount to obtain the preset water distribution amount;
the belt scale control device is used for obtaining the real-time calcium oxide feeding amount from the raw material bin through the preset calcium oxide feeding amount;
the water distribution output device is used for obtaining real-time water distribution from the water supply pipe through the preset water distribution;
and the transmission device is used for inputting the real-time calcium oxide feeding amount and the real-time water blending amount into the calcium hydroxide digestion device, so that the calcium hydroxide raw material is obtained through the calcium hydroxide digestion device.
Preferably, the calcium hydroxide digestion unit may be of the type hq1500.
It should be understood that the belt scale control device is a belt scale control instrument.
It should be understood that the central control computer is connected with the PLC, the PLC is respectively connected with the belt scale control device and the water distribution output device, and the transmission device is respectively connected with the belt scale control device and the water distribution output device.
It should be understood that the system has stable mixing proportion, reduces the speed, reduces the possibility of overload and blockage and improves the lifting efficiency.
It should be understood that, firstly, according to the detected proportion content of the raw material CaO, the mixing proportion coefficient of the raw material and the water is calculated; and secondly, manually fine-adjusting the digestion process according to the mixing proportionality coefficient to obtain a final proportionality coefficient, namely the material-water mixing proportionality value.
Specifically, firstly, the operator first makes a ratio of 56+18=74 according to the formula CaO + H2O = Ca (OH) 2 and the data of the periodic table of elements; therefore, the raw material proportion required by 1 ton of finished calcium hydroxide can be calculated according to the theoretical value, and the content of calcium oxide is 56/X =74/1, X =0.757 ton; the water content 18/Y =74/1, Y =0.243 ton. The proportion of calcium oxide with 100% purity to water is 3.12:1, but in practice is impure, so that 0.841 tonnes of calcium oxide are required, calculated to assay 90% purity, so that theoretically 0.841 tonnes of calcium oxide of 90% purity plus 0.243 tonnes of water completely digest one tonne of calcium hydroxide. The theoretical proportion of calcium oxide to water is approximately 3.46:1; and finally, finely allocating the ratio by an operator according to the theoretical value to produce the product with the optimal quality. For example, the ratio of the best quality is 3.2:1; then, an operator only needs to introduce the preset calcium oxide feeding amount of XX T/H and the material-water mixing ratio value of X1: X2 on the central control computer according to the debugging ratio, and the system can automatically perform proportioning according to the preset calcium oxide feeding amount and the material-water mixing ratio value. For example: the preset feeding amount of the calcium oxide is set to be 10T/H, and the calcium oxide is mixed according to the ratio of the calcium oxide to the water which is 3.2:1, the preset water distribution amount is controlled and given according to 10 multiplied by 1/4.2=2.38T/H.
It should be understood that the PLC logic controller employs a storage logic, the control logic is stored in the memory in a program manner, and only the program needs to be changed to change the control logic, which is called a soft wiring; the PLC logic controller is controlled by a semiconductor circuit controlled by a program instruction, and has the advantages of high speed, microsecond level, strict synchronization and no jitter; the PLC logic controller uses a semiconductor integrated circuit as a timer, has high precision and convenient time adjustment, and is not influenced by the environment; one small PLC logic controller has hundreds of programming elements for users, and has strong function and can realize very complex control function. The system has the advantages of complete hardware matching, convenient use, strong adaptability, high reliability, strong anti-interference capability, less workload of design, installation and debugging of the system and simple programming method; the interface of the central control computer is beautiful, the operation is convenient, the communication is simple and practical, and the information collection, recording and display are friendly.
In the embodiment, the preset water distribution amount is obtained by calculating the water distribution amount of the material-water mixing ratio value according to the preset calcium oxide feeding amount, the real-time calcium oxide feeding amount is obtained from the raw material bin according to the preset calcium oxide feeding amount, the real-time water distribution amount is obtained from the water supply pipe according to the preset water distribution amount, and the real-time calcium oxide feeding amount and the real-time water distribution amount are input into the calcium hydroxide digestion device, so that the calcium hydroxide raw material is obtained by the calcium hydroxide digestion device.
Optionally, as an embodiment of the present invention, the belt scale control device includes a controller, a frequency converter and a feeding belt scale,
the controller is used for generating a frequency conversion signal through a PID proportion integration differentiation control algorithm and the preset feeding amount of the calcium oxide;
the frequency converter is used for generating a frequency modulation signal according to the frequency conversion signal;
and the feeding belt scale is used for controlling the feeding speed and the feeding weight of the raw material bin according to the frequency modulation signal and obtaining the real-time calcium oxide feeding amount according to the feeding speed and the feeding weight.
It should be understood that the controller is respectively connected with the PLC logic controller and the frequency converter, and the frequency converter is connected with the feeding belt scale.
It should be understood that the PID proportional-integral-derivative control algorithm is called PID control according to proportional, integral and derivative control in an analog control system, and the algorithm is simple, convenient to adjust and high in reliability, and has become the most widespread control system in process control application.
It should be understood that the belt scale control device can realize constant control, can automatically adjust the feeding speed under the condition of unbalanced feeding, and can realize constant feeding at the constant speed.
It should be understood that the feeding belt scale has a statistical function, can feed the yield back to the PLC logic controller end for calculation statistics, and can clearly know the consumption weight of the raw materials by displaying a report function on the central control computer.
In the above embodiment, the PID proportional-integral-derivative control algorithm and the calcium oxide are used for presetting the feeding amount to generate the frequency conversion signal, the frequency modulation signal is generated according to the frequency conversion signal, the feeding speed and the feeding weight of the raw material bin are controlled according to the frequency modulation signal, and the real-time feeding amount of the calcium oxide is obtained through the feeding speed and the feeding weight, so that the constant control is realized, the technical threshold of operators is reduced, the problems that the intelligent automation degree of a calcium hydroxide production line in the prior art is insufficient and the proportion of the raw material to the water cannot be corrected in real time are solved, the manpower and material resources are saved, and the production efficiency is increased.
Alternatively, as an embodiment of the present invention, the water distribution output means includes a feed water pump, a proportional valve and a flow meter,
the PLC is also used for generating a water feeding pump starting signal according to the preset water distribution amount;
the water supply pump is used for controlling the water supply pipe to supply water according to the water supply pump starting signal;
the PLC is also used for generating a valve opening adjusting signal through a PID proportion integration differentiation control algorithm and the preset water distribution amount;
the proportional valve is used for adjusting the valve opening according to the valve opening adjusting signal and generating a flow statistical signal;
and the flowmeter is used for counting the water flow of the proportional valve according to the flow counting signal to obtain the real-time water distribution amount.
It should be understood that the opening degree of the water feeding pump and the proportional valve can be automatically adjusted to control the water feeding amount.
It should be appreciated that the flow meter is capable of reflecting the instantaneous feedwater flow.
It should be understood that the feed water pump is connected with the PLC logic controller and the proportional valve respectively, and the proportional valve is connected with the flowmeter.
In the above embodiment, a preset water distribution amount generates a water supply pump opening signal, water in a water supply pipe is controlled according to the water supply pump opening signal to perform water supply operation, a valve opening adjusting signal is generated through a PID proportional-integral-derivative control algorithm and the preset water distribution amount, valve opening adjustment is performed according to the valve opening adjusting signal and a flow statistic signal is generated, a real-time water distribution amount is obtained according to statistics of the flow of a proportional valve by the flow statistic signal, the water temperature of a finished product is ensured, the technical threshold of an operator is reduced, the problems that the intelligentized automation degree of a calcium hydroxide production line in the prior art is insufficient and the proportion ratio of raw materials to water cannot be corrected in real time are solved, manpower and material resources are saved, and the production efficiency is increased.
Optionally, as an embodiment of the present invention, the PLC logic controller is further configured to:
calculating the difference between the preset feeding amount of the calcium oxide and the real-time feeding amount of the calcium oxide to obtain a feeding difference;
calculating the difference between the preset water distribution amount and the real-time water distribution amount to obtain a water distribution difference;
when the feeding difference value is larger than a preset feeding tolerance value and the water distribution difference value is smaller than or equal to a preset water distribution tolerance value, taking the real-time calcium oxide feeding amount as an updated preset calcium oxide feeding amount, and calculating the water distribution amount of the material-water mixing ratio according to the updated preset calcium oxide feeding amount to obtain an updated preset water distribution amount;
when the water distribution difference value is larger than the preset water distribution tolerance value and the feeding difference value is smaller than or equal to the preset feeding tolerance value, taking the real-time water distribution amount as the updated preset water distribution amount, and calculating the feeding amount of the material-water mixing ratio according to the updated preset water distribution amount to obtain the updated preset calcium oxide feeding amount;
judging whether the difference between the feeding difference value and the preset feeding tolerance value is larger than the difference between the water distribution difference value and the preset water distribution tolerance value, if so, taking the real-time calcium oxide feeding amount as an updated preset calcium oxide feeding amount, and calculating the water distribution amount according to the updated preset calcium oxide feeding amount to obtain an updated preset water distribution amount,
and if not, taking the real-time water distribution amount as the updated preset water distribution amount, and calculating the feeding amount of the material-water mixing ratio according to the updated preset water distribution amount to obtain the updated preset feeding amount of the calcium oxide.
It is to be understood that the preset calcium oxide feeding amount or the preset water distribution amount is not updated in other cases.
It should be understood that the difference calculation is an absolute value.
It should be understood that the water flow meter can feed back the water supply flow in real time, and the PLC logic controller can stabilize the water supply quantity by using a PID proportion integration differentiation control algorithm and can carry out statistical calculation on the water consumption.
It should be understood that the problems that the proportion of the raw materials to the water cannot be corrected in real time, the optimal product quality cannot be guaranteed, the optimal equipment performance cannot be guaranteed and the moisture temperature of the finished product cannot be guaranteed by the calcium hydroxide in the prior art are solved.
Specifically, in production over-run, an abnormal situation may occur: 1. the feeding difference value exceeds the preset feeding tolerance value, for example: and when the real-time feeding amount of the calcium oxide is reduced to 8T/H, the preset water distribution amount is adjusted according to 8 multiplied by 1/4.2=1.9T/H, namely the updated preset water distribution amount, and whether the feeding difference value exceeds the preset feeding tolerance value is judged in a delayed manner. The preset feeding tolerance value is used for proportioning the water supply quantity again according to a formula, namely the updated preset water distribution quantity; and setting the feeding amount and controlling the water feeding flow according to the preset feeding amount of the calcium oxide within the preset feeding tolerance value range. 2. The water distribution difference value exceeds the preset water distribution tolerance value, for example: if the real-time water distribution amount is 1.9T/H, the feeding amount can be adjusted according to 1.9 multiplied by 4.2/1=8T/H, namely the updated preset feeding amount of the calcium oxide; and then, judging whether the water distribution difference value exceeds the preset water distribution tolerance value in a delayed manner. If the preset water distribution tolerance value is exceeded, the feeding amount is proportioned again according to a formula, namely the updated preset feeding amount of the calcium oxide; and setting a feeding amount and controlling the flow of the water pump according to the preset water distribution amount within the range of the preset water distribution tolerance value. 3. And if the feeding difference value and the water distribution difference value exceed the preset feeding tolerance value and the preset water distribution tolerance value, taking the maximum value exceeding the two tolerance values as a control reference, and specifically debugging according to the two regulation.
In the embodiment, the difference between the preset calcium oxide feeding amount and the real-time calcium oxide feeding amount is calculated to obtain the feeding difference, and the difference between the preset water distribution amount and the real-time water distribution amount is calculated to obtain the water distribution difference, so that the problems that the intelligent automation degree of a calcium hydroxide production line in the prior art is insufficient, the raw material or water is rich in material and little in water, the material is poor in water and the technical threshold of operators is reduced, the manpower and material resources are saved, and the production efficiency is increased.
Optionally, as an embodiment of the present invention, the PLC logic controller is further configured to:
when the real-time calcium oxide feeding amount is 0, generating a first water and material stopping instruction;
the belt scale control device is also used for stopping obtaining the real-time calcium oxide feeding amount from the raw material bin according to the first water and material stopping instruction;
the water distribution output device is also used for obtaining the real-time water distribution amount from the water supply pipe according to the first water supply stopping instruction;
the central control computer is also used for sending an alarm according to the first water and material cut-off instruction and displaying a preset first fault prompt;
the PLC is also used for generating a second water and material cut-off instruction when the real-time water distribution amount is 0;
the belt scale control device is also used for stopping obtaining the real-time calcium oxide feeding amount from the raw material bin according to the second water supply and material cut-off instruction;
the water distribution output device is also used for obtaining the real-time water distribution amount from the water supply pipe according to the second water supply stopping instruction;
and the central control computer is also used for giving an alarm according to the second water and material cut-off instruction and displaying a preset second fault prompt.
It will be appreciated that automatic diagnosis of faults can be made, fault removal being simple and efficient.
It should be understood that the preset first fault prompt is that the feeding amount is insufficient, and the feeding is required to be timely carried out; and the preset second fault prompt indicates that the water distribution amount is insufficient and water is required to be added in time.
Specifically, if no water or no material exists, the system can automatically stop water and stop material and give an alarm for prompting.
In the embodiment, when the real-time calcium oxide feeding amount is 0, the first water-supply-stop instruction is generated, the real-time calcium oxide feeding amount from the raw material bin is stopped according to the first water-supply-stop instruction, and the real-time water distribution amount from the water supply pipe is obtained according to the first water-supply-stop instruction, so that the fault can be automatically diagnosed, the fault is easily cleared, the efficiency is high, the technical threshold of an operator is lowered, manpower and material resources are saved, and the production efficiency is increased.
Optionally, as another embodiment of the present invention, the method further includes measuring the amount of the calcium oxide fed in real time, and automatically calculating the weight of the finished product according to the measuring function of the belt scale, for example: when 100 tons of raw materials are consumed in 8 hours, the weight of the finished calcium hydroxide product is 100 multiplied by 3.12/3.2 multiplied by 75/56=130T.
Optionally, as another embodiment of the present invention, as shown in fig. 2, the system is controlled by combining the PID automatic adjustment control based on the belt weighing controller, the PLC logic control technology, the PID automatic adjustment control based on the PLC, the centralized control application technology based on the central control system, and software.
1. On the basis of the existing belt weighing control instrument, the PID automatic adjusting function of the control instrument is utilized, the frequency of the frequency converter is utilized to automatically adjust the rotating speed of the belt, and a constant control mode is realized.
2. The PLC logic controller is used as a system control center, a program logic control mode is used, and the analog quantity is used for automatically controlling the feeding flow proportion of the belt scale controller and interlocking control of all functions.
3. The PID automatic regulation control function of the PLC is used for reading the instantaneous flow of the water pump flowmeter, the PLC is used for automatic program operation and comparison, the opening of a valve of a water supply example valve is controlled through 4-20MA analog quantity control to control the water supply quantity, and a constant water control mode is realized.
4. The central computer application technology and the central control software are used as a basic platform, the PLC logic controller is remotely controlled in a communication mode, the central centralized control of each system is realized,
the method specifically comprises the following steps:
1. calculating a mixing proportion coefficient of the raw material and water according to the detected proportion content of the raw material CaO;
2. manually fine-adjusting the digestion process according to the mixing proportion coefficient to obtain a final proportion coefficient, namely the material-water mixing proportion value;
3. remotely controlling the PLC logic controller according to the preset calcium oxide feeding amount by setting the material-water mixing proportion value and the belt scale on a central control picture of the central control computer, and controlling the preset water distribution amount and the preset calcium oxide feeding amount through automatic program control;
4. the belt scale controller, namely the belt scale control device, applies a PID automatic regulating function, namely a PID proportional-integral-derivative control algorithm, automatically controls the frequency of the frequency converter through analog quantity, and controls the feeding speed in real time. When the blanking is not balanced and the material layer is not stable, the constant real-time calcium oxide feeding amount is ensured in a balanced manner.
5. The PLC reads the 4-20ma analog quantity signal of the flowmeter to calculate the feedback flow of the water pump, and the opening of the proportional valve is automatically adjusted by using the 4-20ma analog quantity signal to control the real-time water distribution amount through a PID (proportion integration differentiation) functional block of the PLC, namely the PID (proportion integration differentiation) proportional control algorithm and the flow feedback value, namely the real-time water distribution amount, so that the water supply flow is stabilized and kept at a stable value.
6. And feeding back the real-time calcium oxide feeding amount of the feeding machine and the real-time water distribution amount of the water feeding pump by a belt scale controller, and automatically controlling the feeding amount and a proportional valve in a closed loop manner to stabilize the proportional coefficient of the raw materials and the water. Thereby realizing that the feed is less and the feed quantity is less, and the feed quantity is less and the feed quantity is reduced accordingly.
7. And monitoring the material-water mixing ratio, the feedback data and the running condition of the whole digestion system by the central control computer, storing and recording to finally form a production report.
Optionally, as another embodiment of the present invention, as shown in fig. 2, 1, the central control computer remotely sets a preset feeding amount of calcium oxide and a mixing ratio value of the feeding amount and the feeding water; 2. the PLC sets a channel automatically through analog quantity in proportion by an operation program, and remotely sets the preset calcium oxide feeding quantity of the belt scale control device and the opening of the proportional valve; 3. and 4, the PLC logic controller automatically adjusts the opening degree of the proportional valve to adjust the flow rate of the water pump by reading the real-time water distribution amount of a flow meter and using a PID function block, namely the PID proportional-integral-derivative control algorithm.
Specifically, 1, if the belt scale control device and the water distribution output device are in fault, the system stops material all the way, and gives an alarm to prompt and record the fault reason; 2. when feeding or water supply overtime occurs, the preset feeding tolerance value or the preset water distribution tolerance value occurs, each PLC logic controller can automatically adjust the feeding amount and the water supply amount by operation, and if a certain belt scale control device has no material, the system can immediately stop material distribution and give an alarm to prompt and record fault reasons.
Alternatively, as another embodiment of the present invention, as shown in fig. 3, PV is the calcium oxide real-time feeding amount, i.e. the calcium oxide real-time feeding amount obtained by the controller through the monitoring unit on the belt; SV is the preset calcium oxide feeding amount, namely the PLC remotely gives the preset calcium oxide feeding amount of the controller; the input deviation signal of the PID proportional-integral-derivative control algorithm is as follows: e = SV-PV, V is the PID control algorithm output. Therefore, when the system normally operates, the PLC sets a flow value of a belt scale, namely the preset calcium oxide feeding amount, according to an analog quantity current signal of 4ma-20ma, the belt scale controller receives a weight signal and a speed signal of a belt part, calculates the real-time calcium oxide feeding amount and a cumulative weight value, and sends the real-time calcium oxide feeding amount to the PID proportional-integral-derivative control algorithm in the form of 4ma-20ma analog current, and the PID proportional-integral-derivative control algorithm compares the received flow signal with an internal set value, namely the preset calcium oxide feeding amount, and outputs an analog current signal of 4ma-20ma to control the feeding amount of the belt feeder, namely the real-time calcium oxide feeding amount, so that the real-time calcium oxide feeding amount of the belt feeder part is closer to the preset calcium oxide feeding amount, and the effect of constant feeding is achieved.
Fig. 4 is a schematic flow chart of a method for controlling water distribution of calcium hydroxide feed according to an embodiment of the present invention.
Alternatively, as another embodiment of the present invention, as shown in fig. 4, a method for controlling the distribution of water in a calcium hydroxide feed, comprises:
leading in calcium oxide to preset a feeding amount and a material-water mixing ratio value;
calculating the water distribution amount of the material-water mixing ratio value according to the preset calcium oxide feeding amount to obtain a preset water distribution amount;
obtaining the real-time feeding amount of calcium oxide from the raw material bin according to the preset feeding amount of calcium oxide;
obtaining a real-time water distribution amount from a water supply pipe through the preset water distribution amount;
and inputting the real-time calcium oxide feeding amount and the real-time water blending amount into a calcium hydroxide digestion device, so as to obtain a calcium hydroxide raw material through the calcium hydroxide digestion device.
Optionally, as an embodiment of the present invention, the process of obtaining the real-time feeding amount of calcium oxide from the raw material bin by the preset feeding amount of calcium oxide includes:
generating a frequency conversion signal through a PID proportional-integral-derivative control algorithm and the preset calcium oxide feeding amount;
generating a frequency modulation signal according to the frequency conversion signal;
and controlling the feeding speed and the feeding weight of the raw material bin according to the frequency modulation signal, and obtaining the real-time calcium oxide feeding amount according to the feeding speed and the feeding weight.
Optionally, as an embodiment of the present invention, the process of obtaining the real-time water distribution amount from the water supply pipe by the preset water distribution amount includes:
generating a water feeding pump starting signal according to the preset water distribution amount;
controlling the water supply pipe to supply water according to the water supply pump starting signal;
generating a valve opening adjusting signal through a PID proportional-integral-derivative control algorithm and the preset water distribution amount;
adjusting the valve opening according to the valve opening adjusting signal and generating a flow statistical signal;
and counting the water flow of the proportional valve according to the flow counting signal to obtain the real-time water distribution amount.
Alternatively, another embodiment of the present invention provides a calcium hydroxide feed water distribution control system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, which when executed by the processor, implements the calcium hydroxide feed water distribution control method as described above. The device may be a computer or the like.
Alternatively, another embodiment of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements a method of controlling the distribution of calcium hydroxide feed water as described above.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. It should be understood that the technical solution of the present invention essentially or partly contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A calcium hydroxide feeding and water distribution control system is characterized by comprising a central control computer, a PLC (programmable logic controller), a belt scale control device, a transmission device and a water distribution output device connected with a water supply pipe;
the central control computer is used for introducing a preset feeding amount of calcium oxide and a mixing proportion value of the material and the water;
the PLC is used for calculating the water distribution amount of the material-water mixing ratio value according to the preset calcium oxide feeding amount to obtain the preset water distribution amount;
the belt scale control device is used for obtaining the real-time calcium oxide feeding amount from the raw material bin through the preset calcium oxide feeding amount;
the water distribution output device is used for obtaining real-time water distribution from the water supply pipe through the preset water distribution;
the transmission device is used for inputting the real-time feeding amount of the calcium oxide and the real-time water blending amount into the calcium hydroxide digestion device, so that a calcium hydroxide raw material is obtained through the configuration of the calcium hydroxide digestion device;
the PLC logic controller is further configured to:
calculating the difference between the preset feeding amount of the calcium oxide and the real-time feeding amount of the calcium oxide to obtain a feeding difference;
calculating the difference between the preset water distribution amount and the real-time water distribution amount to obtain a water distribution difference;
when the feeding difference value is larger than a preset feeding tolerance value and the water distribution difference value is smaller than or equal to a preset water distribution tolerance value, taking the real-time calcium oxide feeding amount as an updated preset calcium oxide feeding amount, and calculating the water distribution amount of the material-water mixing ratio according to the updated preset calcium oxide feeding amount to obtain an updated preset water distribution amount;
and when the water distribution difference value is larger than the preset water distribution tolerance value and the feeding difference value is smaller than or equal to the preset feeding tolerance value, taking the real-time water distribution amount as the updated preset water distribution amount, and calculating the feeding amount of the material-water mixing ratio according to the updated preset water distribution amount to obtain the updated preset calcium oxide feeding amount.
2. The calcium hydroxide feeding and water distribution control system as claimed in claim 1, wherein the belt scale control device comprises a controller, a frequency converter and a feeding belt scale,
the controller is used for generating a frequency conversion signal through a PID proportional-integral-derivative control algorithm and the preset calcium oxide feeding amount;
the frequency converter is used for generating a frequency modulation signal according to the frequency conversion signal;
and the feeding belt scale is used for controlling the feeding speed and the feeding weight of the raw material bin according to the frequency modulation signal and obtaining the real-time calcium oxide feeding amount according to the feeding speed and the feeding weight.
3. A calcium hydroxide feed water distribution control system as claimed in claim 1, wherein said water distribution output device comprises a feed water pump, a proportioning valve and a flow meter,
the PLC is also used for generating a water feeding pump starting signal according to the preset water distribution amount;
the water supply pump is used for controlling the water supply pipe to supply water according to the water supply pump starting signal;
the PLC is also used for generating a valve opening adjusting signal through a PID proportion integration differentiation control algorithm and the preset water distribution amount;
the proportional valve is used for adjusting the valve opening according to the valve opening adjusting signal and generating a flow statistical signal;
and the flowmeter is used for counting the water flow of the proportional valve according to the flow counting signal to obtain the real-time water distribution amount.
4. A calcium hydroxide feed water distribution control system as claimed in claim 1, wherein said PLC logic controller is further configured to:
when the real-time calcium oxide feeding amount is 0, generating a first water and material stopping instruction;
the belt scale control device is also used for stopping obtaining the real-time calcium oxide feeding amount from the raw material bin according to the first water and material stopping instruction;
the water distribution output device is also used for obtaining the real-time water distribution amount from the water supply pipe according to the first water cut-off and material cut-off instruction;
the central control computer is also used for giving an alarm according to the first water cut-off and material cut-off instruction and displaying a preset first fault prompt;
the PLC is also used for generating a second water and material cut-off instruction when the real-time water distribution amount is 0;
the belt scale control device is also used for stopping obtaining the real-time calcium oxide feeding amount from the raw material bin according to the second water and material stopping instruction;
the water distribution output device is also used for obtaining the real-time water distribution amount from the water supply pipe according to the second water cut-off and material cut-off instruction;
and the central control computer is also used for sending an alarm according to the second water and material cut-off instruction and displaying a preset second fault prompt.
5. A calcium hydroxide feeding and water distribution control method is characterized by comprising the following steps:
leading in calcium oxide to preset a feeding amount and a material-water mixing ratio value;
calculating the water distribution amount of the material-water mixing ratio value according to the preset feeding amount of the calcium oxide to obtain a preset water distribution amount;
obtaining the real-time feeding amount of calcium oxide from the raw material bin according to the preset feeding amount of calcium oxide;
obtaining a real-time water distribution amount from a water supply pipe through the preset water distribution amount;
inputting the real-time calcium oxide feeding amount and the real-time water blending amount into a calcium hydroxide digestion device, so as to obtain a calcium hydroxide raw material through the calcium hydroxide digestion device;
further comprising:
calculating the difference between the preset feeding amount of the calcium oxide and the real-time feeding amount of the calcium oxide to obtain a feeding difference;
calculating the difference between the preset water distribution amount and the real-time water distribution amount to obtain a water distribution difference;
when the feeding difference value is larger than a preset feeding tolerance value and the water distribution difference value is smaller than or equal to a preset water distribution tolerance value, taking the real-time calcium oxide feeding amount as an updated preset calcium oxide feeding amount, and calculating the water distribution amount of the material-water mixing ratio according to the updated preset calcium oxide feeding amount to obtain an updated preset water distribution amount;
and when the water distribution difference value is larger than the preset water distribution tolerance value and the feeding difference value is smaller than or equal to the preset feeding tolerance value, taking the real-time water distribution amount as the updated preset water distribution amount, and calculating the feeding amount of the material-water mixing ratio according to the updated preset water distribution amount to obtain the updated preset feeding amount of the calcium oxide.
6. The method for controlling water distribution of calcium hydroxide feeding according to claim 5, wherein the step of obtaining the real-time feeding amount of calcium oxide from the raw material bin through the preset feeding amount of calcium oxide comprises the following steps:
generating a frequency conversion signal through a PID proportion integration differentiation control algorithm and the preset feeding amount of the calcium oxide;
generating a frequency modulation signal according to the frequency conversion signal;
and controlling the feeding speed and the feeding weight of the raw material bin according to the frequency modulation signal, and obtaining the real-time calcium oxide feeding amount according to the feeding speed and the feeding weight.
7. The method for controlling water distribution of calcium hydroxide feed according to claim 5, wherein the step of obtaining the real-time water distribution amount from the water supply pipe by the preset water distribution amount comprises:
generating a water feeding pump starting signal according to the preset water distribution amount;
controlling the water supply pipe to supply water according to the water supply pump starting signal;
generating a valve opening adjusting signal through a PID proportional-integral-derivative control algorithm and the preset water distribution amount;
adjusting the valve opening according to the valve opening adjusting signal and generating a flow statistical signal;
and counting the water flow of the proportional valve according to the flow statistical signal to obtain the real-time water distribution amount.
8. A calcium hydroxide feed water distribution control system comprising a memory, a processor, and a computer program stored in said memory and executable on said processor, wherein said processor, when executing said computer program, implements a calcium hydroxide feed water distribution control method as set forth in any one of claims 5 to 7.
9. A computer-readable storage medium, storing a computer program, wherein the computer program, when executed by a processor, implements the method of controlling the distribution of water to calcium hydroxide feed as set forth in any one of claims 5 to 7.
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