CN115672219A - Method and system for automatically controlling pH value of reaction kettle - Google Patents
Method and system for automatically controlling pH value of reaction kettle Download PDFInfo
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- CN115672219A CN115672219A CN202211384231.8A CN202211384231A CN115672219A CN 115672219 A CN115672219 A CN 115672219A CN 202211384231 A CN202211384231 A CN 202211384231A CN 115672219 A CN115672219 A CN 115672219A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 151
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000003513 alkali Substances 0.000 claims abstract description 28
- 239000000376 reactant Substances 0.000 claims abstract description 24
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 17
- 238000004140 cleaning Methods 0.000 claims description 39
- 238000002955 isolation Methods 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 230000008054 signal transmission Effects 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 6
- 239000000284 extract Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 5
- 239000007810 chemical reaction solvent Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 239000012847 fine chemical Substances 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000001139 pH measurement Methods 0.000 abstract description 6
- 230000006870 function Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000012824 chemical production Methods 0.000 description 5
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- 238000004590 computer program Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 230000037431 insertion Effects 0.000 description 2
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- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention belongs to the technical field of reaction kettle PH measurement, and particularly provides a method and a system for automatically controlling the PH value of a reaction kettle, wherein the method comprises the following steps: pushing each medium into the reaction kettle according to a preset proportion through a corresponding interlocking pump; automatically inserting a PH meter into the reaction kettle to collect the PH value after the batch yield of the reaction kettle is reached; when the DCS acquires the PH value measured by the PH meter, the DCS automatically controls to pull out the PH meter and clean the PH meter; automatically feedback-controlling the alkali liquor dropping tank to drop alkali liquor and/or the reactant dropping tank to drop reactants by comparing the pH value with a target pH value, and automatically inserting a pH meter into the reaction kettle to collect the pH value; repeating the steps until the PH value in the reaction kettle reaches the target PH value range required by the polymerization reaction, and starting the reaction kettle to work. The scheme solves the problems of discontinuous pH on-line measurement and low automation degree of the fine chemical reaction kettle; on the other hand, unattended automatic control is realized, and the production automation level is greatly improved.
Description
Technical Field
The invention relates to the technical field of reaction kettle PH measurement, in particular to a method and a system for automatically controlling the PH value of a reaction kettle.
Background
In recent years, the technical level in chemical production is continuously improved, the history of manual operation is changed, and the process advances to a novel chemical production mode for automatically controlling continuous production. The fine chemical industry in anywhere is developed vigorously, the production automation level is gradually improved, and the continuous control requirement is higher and higher. In order to improve the competitive advantage of enterprises, reduce the labor cost and the production cost, the annual production capacity of products is greatly improved, and the biggest obstacle influencing the production of fine chemicals is the continuous measurement of the pH value of a reaction kettle. The traditional PH value measurement adopts a manual control or timing control mode, the production is an intermittent production mode in the fine chemical production industry, the mode cannot adapt to the improvement of the production capacity of fine chemicals, and the selection of a DCS system control mode for continuously measuring the PH value is particularly important.
Aiming at common reaction processes such as polymerization reaction, neutralization reaction and the like in fine chemical engineering, the pH value generally influences the stability of the reaction, the particle size and the distribution of the product and the like, and is an important control index of the reaction kettle. However, PH control is an extremely non-linear process, and when PH is too low or too high (strong acidity or basicity), PH changes abnormally slowly; when the pH value is about 6-7, a small amount of reagent is added in the reaction process to adjust the pH value, the change is very obvious, and the pH value measurement has lag and delay, so that the control difficulty is high, and the engineering problem is always solved. In addition, in order to deal with various reaction conditions with different pH values controlled in different reaction processes, reaction materials and products in the reaction kettle are switched in batches, the control of the operation sequence of inserting, pulling out, cleaning and the like of the pH electrode is discontinuous, manual inching control is still needed for inserting, pulling out and cleaning, and automatic operation in sequence in an interlocking mode is not realized. Because the automatic control degree is not high, the annual capacity is greatly reduced, the investment and cost of operators are high, the labor intensity of the operators is high, the damage probability of the PH meter is increased, and the whole production cost is increased.
Disclosure of Invention
The invention aims at the technical problems of delayed and discontinuous PH measurement of a reaction kettle in the prior art.
The invention provides a method for automatically controlling the pH value of a reaction kettle, which comprises the following steps:
s1, respectively pushing each medium into a reaction kettle through corresponding interlocking pumps according to a preset proportion;
s2, automatically inserting a PH meter into the reaction kettle to collect the PH value after the batch yield of the reaction kettle is achieved;
s3, automatically controlling to pull out the pH meter and cleaning after the DCS obtains the pH value measured by the pH meter;
s4, automatically controlling the alkali liquor dripping tank to drip alkali liquor and/or the reactant dripping tank to drip reactant by feedback by comparing the pH value with a target pH value, and automatically inserting a pH meter into the reaction kettle to collect the pH value;
and S5, repeating the steps S3 to S4 until the pH value in the reaction kettle reaches the target pH value range required by the polymerization reaction, and starting the reaction kettle to work.
Preferably, the PH meter is an electrode type PH sensor, a digital signal transmission chip is arranged in the electrode type PH sensor, and the PH value is transmitted to a DCS control system by using a digital signal transmission mode.
Preferably, the S1 specifically includes:
the media comprise pure water as reaction solvent, 25% NaOH alkali solution as pH regulator, and reaction materials, each medium is conveyed into the reaction kettle through an independent pipeline, and each independent pipeline is provided with a feed switch valve;
obtaining the feeding amount of each medium after the balance calculation of polymerization reaction materials according to the batch yield of a reaction kettle, and presetting the feeding amount in a DCS (distributed control system);
and the DCS controls the switching value of each interlocking pump so that each medium is pushed into the reaction kettle according to a preset proportion.
Preferably, before the S1, a step of S0:
offer the entrance to a cave on the reation kettle lateral wall, at entrance to a cave outside seal installation belt cleaning device, the belt cleaning device outside is equipped with telescoping device, through DCS control system control drive telescoping device removes to drive the PH meter and pass belt cleaning device and insert reation kettle and measure the PH value, or drive the measuring head of PH meter and extract to belt cleaning device in from reation kettle, belt cleaning device pours into the clear water and washs the measuring head of PH meter.
Preferably, S0 specifically includes:
the telescopic device comprises a sheath, an air cylinder and a connecting rod, the air cylinder is connected with the PH meter through the connecting rod, one end in the sheath is provided with a first air supply hole and a first air return hole, and the other end is provided with a second air supply hole and a second air return hole;
when the PH meter is positioned in the reaction kettle and needs to be pulled out, the DCS control system controls the second air return hole to exhaust air from one side of the air cylinder, controls the first air supply hole to supply air to the other side of the air cylinder, and closes other air holes, so that the PH meter is pulled out of the reaction kettle to the isolation cavity;
when the PH meter is located and needs to be inserted outside the reaction kettle, the DCS control system controls the first air return hole to exhaust air from one side of the cylinder, controls the second air supply hole to supply air to the other side of the cylinder, and closes other air holes, so that the PH meter is inserted into the reaction kettle to measure the PH value.
Preferably, the cleaning device comprises a flange plate and an isolation cavity, one end of the isolation cavity is connected with one end of the flange plate, the other end of the flange plate is hermetically connected with the reaction kettle, the other end of the isolation cavity is connected with the sheath, a flushing water inlet and a wastewater outlet are arranged at the upper end and the lower end of the isolation cavity, an isolation chamber is arranged in the middle of the isolation cavity, and the pH meter penetrates through the isolation chamber;
the air cylinder drives the PH meter to be inserted into the reaction kettle to measure the PH value, or the PH meter is pulled out from the reaction kettle to the isolation chamber, clear water is injected into the isolation chamber through the washing water inlet to clean the PH meter measuring head in the isolation chamber, and the cleaned waste water flows out from the waste water outlet.
Preferably, S0 specifically includes:
and a hole is formed in the side wall of the reaction kettle from outside to inside and is inclined downwards, and the flange plate is welded on the outer side of the hole in a sealing manner.
The embodiment of the invention also provides a system for automatically controlling the pH value of the reaction kettle, which is used for realizing the steps of the method for automatically controlling the pH value of the reaction kettle and comprises the following steps:
the feeding module is used for respectively pushing each medium into the reaction kettle according to a preset proportion through the corresponding interlocking pump;
the PH value measuring module is used for automatically inserting a PH meter into the reaction kettle to collect the PH value after the batch yield of the reaction kettle is achieved; after the DCS obtains the PH value measured by the PH meter, automatically controlling to pull out the PH meter and cleaning;
the PH value adjusting module is used for automatically feeding back and controlling the alkali liquor dripping tank to drip alkali liquor and/or the reactant dripping tank to drip reactant by comparing the current PH value with a target PH value, and then automatically inserting a PH meter into the reaction kettle to acquire the PH value; and (5) repeating the step (S3) to the step (S4) until the pH value in the reaction kettle reaches the target pH value range required by the polymerization reaction, and starting the reaction kettle to work.
The embodiment of the invention also provides electronic equipment which comprises a memory and a processor, wherein the processor is used for realizing the steps of the automatic control method of the PH value of the reaction kettle when executing the computer management program stored in the memory.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer management program is stored on the computer readable storage medium, and the computer management program realizes the steps of the automatic control method for the PH value of the reaction kettle when being executed by the processor.
Has the advantages that: the invention provides a method and a system for automatically controlling the pH value of a reaction kettle, wherein the method comprises the following steps: pushing each medium into the reaction kettle according to a preset proportion through a corresponding interlocking pump; automatically inserting a PH meter into the reaction kettle to collect the PH value after the batch yield of the reaction kettle is reached; after the DCS obtains the PH value measured by the PH meter, automatically controlling to pull out the PH meter and cleaning; automatically feeding back and controlling the alkali liquor dripping tank to drip alkali liquor and/or the reactant dripping tank to drip reactant by comparing the pH value with a target pH value, and automatically inserting a pH meter into the reaction kettle to collect the pH value; repeating the steps until the PH value in the reaction kettle reaches the target PH value range required by the polymerization reaction, and starting the reaction kettle to work. The scheme solves the problems of discontinuous pH on-line measurement and low automation degree of the fine chemical reaction kettle; the interlocking automatic control logic of inserting, measuring, pulling out and cleaning the electrodes of the PH meter is solved, and the problems of continuous production and measurement in the fine chemical industry are broken through. On the other hand, unattended automatic control is realized, the production automation level is greatly improved, and the automatic control system has good use value and economic value.
Drawings
FIG. 1 is a flow chart of a method for automatically controlling the pH value of a reaction kettle according to the present invention;
fig. 2 is a schematic diagram of a hardware structure of a possible electronic device provided in the present invention;
FIG. 3 is a schematic diagram of a hardware structure of a possible computer-readable storage medium provided by the present invention;
FIG. 4 is a structural diagram of a washable pH testing device for a reaction kettle according to the present invention;
FIG. 5 is a testing state diagram of a washable pH testing device for a reaction kettle according to the present invention;
FIG. 6 is a cleaning state diagram of the washable pH testing apparatus for a reaction vessel according to the present invention.
Description of reference numerals: the device comprises a reaction kettle 100, a PH test device 200, a flange plate 1, a PH meter 2, a connecting rod 3, a cylinder 4, a first air supply hole 5, a first air return hole 6, a second air supply hole 7, a second air return hole 8, an isolation chamber 9, a flushing water inlet 10, a wastewater outlet 11, a sheath 12 and a movable protective cover 13.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, 4, 5 and 6, an embodiment of the present invention provides a method for automatically controlling a PH of a reaction kettle, including the following steps:
s1, respectively pushing each medium into a reaction kettle 100 through corresponding interlocking pumps according to a preset proportion; the media included pure water as a reaction solvent, 25% NaOH alkali as a pH adjusting agent, and reaction materials, each of which was fed into the reaction vessel 100 through an independent pipe, each of which was provided with a feed switching valve. The feeding amount of each medium is obtained by the balance calculation of the polymerization reaction materials according to the batch yield of the reaction kettle 100 and is preset in a DCS control system. Each time, the amount of the reaction vessel 100 was charged, and then the pH was adjusted.
S2, automatically inserting a PH meter 2 into the reaction kettle 100 to collect the PH value after the batch yield of the reaction kettle 100 is reached;
s3, when the DCS acquires the PH value measured by the PH meter 2, automatically controlling to pull out the PH meter 2 and cleaning; and pulling the pH meter 2 out of the reaction kettle 100 to an isolation cavity, locking the pH value, and automatically flushing the isolation cavity for the next test.
S4, automatically controlling the alkali liquor dripping tank to drip alkali liquor and/or the reactant dripping tank to drip reactant by comparing the pH value with the target pH value, and automatically inserting the pH meter 2 into the reaction kettle 100 to collect the pH value;
and S5, repeating the steps S3 to S4 until the pH value in the reaction kettle 100 reaches the target pH value range required by the polymerization reaction, and starting the reaction kettle 100 to work.
The embodiment of the invention is applied to fine chemical polymerization reaction, pure water is taken as a reaction solvent, 25 percent NaOH alkaline liquor is taken as a PH regulator, reaction materials, the pure water and the alkaline liquor are respectively conveyed to a stirring reaction kettle 100 by a feeding pump, the feeding quality of the reaction materials, the pure water and the alkaline liquor is measured by a mass flowmeter to reach the preset feeding amount, a feeding switch valve of the three materials is automatically cut off, the feeding amount of each medium is calculated by the balance of the polymerization reaction materials according to the batch yield, and is preset in a DCS control system, and the feeding quality, the proportion and the concentration of each medium are preliminarily controlled. By the above operation, the reaction solution is substantially close to the target pH required for the polymerization reaction.
The batch yield of one reaction kettle 100 is conveyed into the reaction kettle 100 every time, then the pH value is measured through the pH meter 2, and then the DCS control system is used for feedback control of the alkali liquor dripping tank dripping alkali liquor and/or the reactant dripping tank dripping reactant so as to adjust the pH value to reach the preset value. After each measurement of the pH, the pH meter 2 was taken out of the reaction vessel 100 and washed. The respective media input amounts of one reactor 100 are prepared first, and then the media are conveyed to the reactor 100 by a pump, and at this time, the PH value in the reactor 100 has an error, and only the preset PH value which is approximately close to the PH value has an error. Then, alkali liquor is dripped into the alkali liquor dripping tank, and reactants are dripped into the reactant dripping tank.
Wherein, the dripping tank, the PH meter 2, the cleaning device and the telescopic device are all jointly controlled by a DCS control system. DCS control system controls the next state change opportunity of each device according to the state of each device, realizes that PH meter 2 inserts reation kettle 100 and measures the PH value in such a linkage way, extracts and washs, and the automatic dropwise add medium of dropwise add jar is adjusted the PH value, and entire system automatic control is efficient, and is safe and environmental protection.
Preferably, the PH meter 2 is an electrode type PH sensor, the electrode type PH sensor is internally provided with a digital signal transmission chip, and a PH value is transmitted to a DCS (distributed control system) by using a digital signal transmission mode. The PH meter 2 adopts an electrode type PH sensor, adopts a digital sensor technology, a digital signal transmission chip is arranged in an electrode, acquired PH signals are transmitted to an external controller through digital signals, the interference of other field equipment is avoided, and the influence of moisture and temperature is avoided. The PH sensor is required to be pre-calibrated before leaving a factory, calibration data is stored on the sensor, and data directly connected with the sensor on the installation site is directly uploaded to an instrument. The PH sensor can resist high temperature of 130 ℃, the pH measurement range is 0-14, and the temperature range is as follows: 0 to 130 ℃. And (3) sealing type: the PTFE annular membrane adopts two reference systems, so that the PTFE annular membrane with a very long diffusion path can resist pollutants, strong oxidants, solvents, acid and alkali and toxic substances.
Preferably, the PH measuring device 200 includes a PH meter, a cleaning device, and a retractable device. Offer the entrance to a cave on reation kettle 100 lateral wall, at entrance to a cave outside seal installation belt cleaning device, the belt cleaning device outside is equipped with telescoping device, through DCS control system control drive telescoping device removes to drive PH meter 2 and pass belt cleaning device and insert reation kettle 100 and measure the PH value, or drive PH meter 2's measuring head and extract to belt cleaning device in from reation kettle 100, belt cleaning device pours into the clear water and washs PH meter 2's measuring head. The cleaning device adopts pneumatic, the air source pressure is 0.6mPa, and 0.4mPa can work normally in actual use. The system is matched with cleaning water, and the compressed air connecting pipes are all socket type interfaces, so that the installation is very convenient. Meanwhile, the cleaning interval and the cleaning time can be set arbitrarily according to the pollution condition of the measured medium to the electrode, namely the measuring head of the PH meter 2, and the electrode can be cleaned at regular time; and locking the output value of the PH value at the cleaning moment. Avoiding interference to the control system. The design of the scheme can clean the automatic telescopic electrode under the condition of not interrupting the production process, prolong the service life of the sensor and improve the measurement precision.
The strategy design of the automatic control method for the PH value of the reaction kettle 100 is as follows:
1) Inserting and pulling control of the PH meter 2: the telescopic jacket 12 of the PH meter 2 is used for controlling the PH meter 2 to be inserted and pulled by the piston movement of the cylinder 4. The pneumatic control is used for controlling the movement of the air cylinder 4 so as to drive the PH meter 2 to extend into and withdraw from the reaction kettle 100. The state signals of the PH meter 2, which stretch into and quit, are introduced into the DCS control system by adopting a signal parallel connection wiring mode, and the remote operation of the relay control cylinder 4 is carried out by utilizing a DO clamping piece of the DCS system, so that the automatic control of the insertion and the extraction of the PH meter 2 is realized. The PH signal is output to the system by 4-20MA through the transducer, the control system needs to provide a module capable of receiving the model of 4-20MA, and receives a signal of position indication, and the PH signal can enter into measurement or exit according to production needs; the signal of on-line plugging and unplugging and the signal of self-cleaning state. The field configures the manual operator to perform PH measurements and exit operations, leaving 4 DIs and 2 DOs.
2) Automatic cleaning control of PH meter 2: two limit switches are newly installed on the air cylinder 4, signals of the limit switches are connected into a DCS control system, and the inserting and pulling states of the air cylinder 4 are recorded respectively; and then programming is carried out in the DCS system to realize the interlocking control function. According to the washing requirement of the electrode of the PH meter 2, the pulling-out signal of the cylinder 4 is taken as the washing condition, and the interlocking triggering washing function is started when the electrode of the PH meter 2 is pulled out, and the timing function of washing of the washing device is realized through programming, so that the interlocking of the control of the cylinder 4 and the timing washing function is perfectly realized.
3) Continuous operation control of PH meter 2:
the continuous operation control is the control function of realizing the PH value measurement in a DCS control system sequence control program, and realizes the continuity of sequence control operation. And performing sequence control programming based on the DCS control system, adding a new Step operation in the sequence control, and programming in the Step to realize the control of the cylinder 4. The flushing function of the electrodes of the PH meter 2 is automatically realized due to the interlocking action. The operator only needs to set the flushing time in advance, and full-automatic control of the reaction operation can be realized by one-key operation. In addition, the program protection can also realize the interlocking protection function of the state of the limit switch of the air cylinder 4 and the whole sequential control, well protect the measuring head, namely the electrode, the sheath 12 and other devices of the PH meter 2, and then realize the continuous operation process of continuous sequential control and PH value measurement.
Preferably, the telescopic device comprises a sheath 12, a cylinder 4 and a connecting rod 3, the cylinder 4 is connected with the PH meter 2 through the connecting rod 3, one end in the sheath 12 is provided with a first air supply hole 5 and a first air return hole 6, and the other end is provided with a second air supply hole 7 and a second air return hole 8; when the PH meter 2 is positioned in the reaction kettle 100 and needs to be pulled out, the DCS control system controls the second air return hole 8 to exhaust air from one side of the air cylinder 4, controls the first air supply hole 5 to supply air to the other side of the air cylinder 4, and closes other air holes, so that the PH meter 2 is pulled out of the reaction kettle 100 to the isolation cavity; when PH meter 2 is located reation kettle 100 and needs to insert outward, DCS control system control first return air hole 6 is bled to cylinder 4 one side, and control second air feed hole 7 is given gas to cylinder 4 opposite side, and other gas holes are closed for PH meter 2 inserts reation kettle 100 in order to measure the PH value.
The movement of the cylinder 4 is completed by the cooperation of the two air supply holes and the two air return holes, thereby driving the insertion and extraction operations of the PH meter 2 from the reaction kettle 100.
In a preferable scheme, the cleaning device comprises a flange plate 1 and an isolation cavity, one end of the isolation cavity is connected with one end of the flange plate 1, the other end of the flange plate 1 is hermetically connected with the reaction kettle 100, the other end of the isolation cavity is connected with the sheath 12, a flushing water inlet 10 and a wastewater outlet 11 are arranged at the upper end and the lower end of the isolation cavity, an isolation chamber 9 is arranged in the middle of the isolation cavity, and the PH meter 2 penetrates through the isolation chamber 9; the air cylinder 4 drives the PH meter 2 to be inserted into the reaction kettle 100 to measure the PH value, or the PH meter 2 is pulled out from the reaction kettle 100 to the isolation chamber 9, clean water is injected through the washing water inlet to clean the measuring head of the PH meter 2 in the isolation chamber 9, and the cleaned wastewater flows out from the wastewater outlet 11.
When the air cylinder 4 drives the PH meter 2 to be pulled out to a preset position, the measuring head of the PH meter 2 is just positioned in the isolation chamber 9, at the moment, the DCS control system controls the measuring head of the PH meter 2 in the isolation chamber 9 to be cleaned by injecting clean water through the washing water inlet, and the cleaned wastewater flows out from the wastewater outlet 11. The isolation chamber 9 is in a sealed state. Therefore, the PH meter 2 can be cleaned every time when being pulled out, and the protective effect is achieved.
In the preferable scheme, a hole is formed in the side wall of the reaction kettle 100 from outside to inside and obliquely downwards, and the flange plate 1 is welded on the outer side of the hole in a sealing mode. The reaction liquid in the reaction vessel 100 is prevented from entering the sheath 12.
Preferably, the end of the PH meter 2 is fixedly connected with a movable protective cover 13, and the PH meter 2 carries the movable protective cover 13 to move together. When the PH meter is pulled out from the reaction kettle 100 to a preset position, the movable protective cover 13 just blocks the opening of the isolation chamber 9 to form a sealed cavity, and at the moment, the isolation chamber 9, namely the measuring head of the PH meter 2 in the sealed cavity, can be cleaned.
The embodiment of the invention also provides a system for automatically controlling the pH value of the reaction kettle, which is used for realizing the steps of the method for automatically controlling the pH value of the reaction kettle, and comprises the following steps:
the feeding module is used for respectively pushing each medium into the reaction kettle according to a preset proportion through the corresponding interlocking pump;
the PH value measuring module is used for automatically inserting a PH meter into the reaction kettle to collect the PH value after the batch yield of the reaction kettle is reached; when the DCS acquires the PH value measured by the PH meter, the DCS automatically controls to pull out the PH meter and clean the PH meter;
the PH value adjusting module is used for automatically feeding back and controlling the alkali liquor dripping tank to drip alkali liquor and/or the reactant dripping tank to drip reactant by comparing the current PH value with a target PH value, and then automatically inserting a PH meter into the reaction kettle to collect the PH value; and (5) repeating the step (S3) to the step (S4) until the pH value in the reaction kettle reaches the target pH value range required by the polymerization reaction, and starting the reaction kettle to work.
Fig. 2 is a schematic diagram of an embodiment of an electronic device according to an embodiment of the invention. As shown in fig. 2, an embodiment of the present invention provides an electronic device, which includes a memory 1310, a processor 1320, and a computer program 1311 stored in the memory 1310 and operable on the processor 1320, where the processor 1320, when executing the computer program 1311, implements the following steps: s1, respectively pushing each medium into a reaction kettle through corresponding interlocking pumps according to a preset proportion;
s2, automatically inserting a PH meter into the reaction kettle to collect the PH value after the batch yield of the reaction kettle is achieved;
s3, automatically controlling to pull out the pH meter and cleaning after the DCS obtains the pH value measured by the pH meter;
s4, automatically controlling the alkali liquor dripping tank to drip alkali liquor and/or the reactant dripping tank to drip reactant by feedback by comparing the pH value with a target pH value, and automatically inserting a pH meter into the reaction kettle to collect the pH value;
and S5, repeating the steps S3 to S4 until the pH value in the reaction kettle reaches the target pH value range required by the polymerization reaction, and starting the reaction kettle to work.
Please refer to fig. 3, which is a schematic diagram of an embodiment of a computer-readable storage medium according to the present invention. As shown in fig. 3, the present embodiment provides a computer-readable storage medium 1400, on which a computer program 1411 is stored, the computer program 1411, when executed by a processor, implementing the steps of: s1, respectively pushing each medium into a reaction kettle through corresponding interlocking pumps according to a preset proportion;
s2, automatically inserting a PH meter into the reaction kettle to collect the PH value after the batch yield of the reaction kettle is reached;
s3, automatically controlling to pull out the PH meter and cleaning after the DCS acquires the PH value measured by the PH meter;
s4, automatically controlling the alkali liquor dripping tank to drip alkali liquor and/or the reactant dripping tank to drip reactant by comparing the pH value with a target pH value at the moment, and then automatically inserting a pH meter into the reaction kettle to collect the pH value;
and S5, repeating the steps S3 to S4 until the pH value in the reaction kettle reaches the target pH value range required by the polymerization reaction, and starting the reaction kettle to work.
Has the beneficial effects that:
the consumption of the PH meter electrode of the reaction kettle is a large part of the cost consumption, mainly because the PH electrode has higher unit price and belongs to an easily-consumed article, the consumption of the electrode is reduced, the waste of glass products is also reduced, and the aims of low carbon, energy conservation and emission reduction are fulfilled. The automatic control device and the control method for PH measurement cleaning realize the automatic control mode of a novel PH meter, have stable use performance and greatly reduce the consumption of electrodes. The interlocking function is obvious, the normal sequential control program execution of fine chemical production is strongly ensured, and the jump from intermittent production to continuous production is realized. Unattended automatic control can be realized on a production site, the production automation level is greatly improved, and the method has good use value and economic value. Compared with the traditional technology, the method mainly has the following advantages:
1) The continuous sequential control operation of the traditional fine chemical production is realized, and the productivity of the device is improved.
2) The labor intensity of staff is reduced, the number of post operators is optimized, and the cost of human resources is greatly reduced.
3) Greatly reduces the equipment damage of the electrode caused by insufficient water washing and reduces the production cost.
4) And the interlocking protection is added, so that the device is protected.
5) The automatic control level of the system is improved, and the mode of intermittent production of the reaction kettle for a long time is solved.
6) The failure rate of the equipment is reduced, and the service life of the equipment is prolonged.
It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to relevant descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such 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 such modifications and variations.
Claims (10)
1. The method for automatically controlling the pH value of the reaction kettle is characterized by comprising the following steps of:
s1, respectively pushing each medium into a reaction kettle through corresponding interlocking pumps according to a preset proportion;
s2, automatically inserting a PH meter into the reaction kettle to collect the PH value after the batch yield of the reaction kettle is reached;
s3, automatically controlling to pull out the pH meter and cleaning after the DCS obtains the pH value measured by the pH meter;
s4, automatically controlling the alkali liquor dripping tank to drip alkali liquor and/or the reactant dripping tank to drip reactant by feedback by comparing the pH value with a target pH value, and automatically inserting a pH meter into the reaction kettle to collect the pH value;
and S5, repeating the steps S3 to S4 until the pH value in the reaction kettle reaches the target pH value range required by the polymerization reaction, and starting the reaction kettle to work.
2. The automatic control method for the pH value of the reaction kettle according to claim 1, wherein the pH meter is an electrode type pH sensor, a digital signal transmission chip is arranged in the electrode type pH sensor, and the pH value is transmitted to a DCS control system by using a digital signal transmission mode.
3. The automatic control method for the pH value of the reaction kettle according to claim 1, wherein the S1 specifically comprises:
the medium comprises pure water as a reaction solvent, 25-percent NaOH alkali liquor as a pH regulator and reaction materials, each medium is conveyed into the reaction kettle through an independent pipeline, and each independent pipeline is provided with a feeding switch valve;
obtaining the feeding amount of each medium after the balance calculation of polymerization reaction materials according to the batch yield of a reaction kettle, and presetting the feeding amount in a DCS (distributed control system);
and the DCS controls the switching value of each interlocking pump so that each medium is pushed into the reaction kettle according to a preset proportion.
4. The method as claimed in claim 1, further comprising a step of, before S1, S0:
offer the entrance to a cave on the reation kettle lateral wall, at entrance to a cave outside seal installation belt cleaning device, the belt cleaning device outside is equipped with telescoping device, through DCS control system control drive telescoping device removes to drive the PH meter and pass belt cleaning device and insert reation kettle and measure the PH value, or drive the measuring head of PH meter and extract to belt cleaning device in from reation kettle, belt cleaning device pours into the clear water and washs the measuring head of PH meter.
5. The automatic control method for the pH value of the reaction kettle according to claim 4, wherein the S0 specifically comprises:
the telescopic device comprises a sheath, an air cylinder and a connecting rod, the air cylinder is connected with the PH meter through the connecting rod, one end in the sheath is provided with a first air supply hole and a first air return hole, and the other end is provided with a second air supply hole and a second air return hole;
when the PH meter is positioned in the reaction kettle and needs to be pulled out, the DCS control system controls the second air return hole to exhaust air from one side of the air cylinder, controls the first air supply hole to supply air to the other side of the air cylinder, and closes other air holes, so that the PH meter is pulled out of the reaction kettle to the isolation cavity;
when the PH meter is located and needs to be inserted outside the reaction kettle, the DCS control system controls the first air return hole to exhaust air from one side of the cylinder, the second air return hole is controlled to supply air to the other side of the cylinder, and other air return holes are closed, so that the PH meter is inserted into the reaction kettle to measure the PH value.
6. The automatic control method for the pH value of the reaction kettle according to claim 5, wherein the cleaning device comprises a flange plate and an isolation cavity, one end of the isolation cavity is connected with one end of the flange plate, the other end of the flange plate is hermetically connected with the reaction kettle, the other end of the isolation cavity is connected with the sheath, a flushing water inlet and a waste water outlet are arranged at the upper end and the lower end of the isolation cavity, an isolation chamber is arranged in the middle of the isolation cavity, and the pH meter penetrates through the isolation chamber;
the cylinder drives the PH meter to insert into the reaction kettle to measure the PH value, or extracts from the reaction kettle to the isolation chamber, the PH meter measuring head in the isolation chamber is cleaned by injecting clean water through the washing water inlet, and the cleaned wastewater flows out from the wastewater outlet.
7. The method as claimed in claim 6, wherein the step S0 comprises:
and a hole is formed in the side wall of the reaction kettle from outside to inside and is inclined downwards, and the flange plate is welded on the outer side of the hole in a sealing manner.
8. An automatic control system for the PH of a reaction vessel, which is used for implementing the automatic control method for the PH of a reaction vessel as claimed in any one of claims 1 to 7, comprising:
the feeding module is used for pushing each medium into the reaction kettle according to a preset proportion through the corresponding interlocking pump;
the PH value measuring module is used for automatically inserting a PH meter into the reaction kettle to collect the PH value after the batch yield of the reaction kettle is achieved; when the DCS acquires the PH value measured by the PH meter, the DCS automatically controls to pull out the PH meter and clean the PH meter;
the PH value adjusting module is used for automatically feeding back and controlling the alkali liquor dripping tank to drip alkali liquor and/or the reactant dripping tank to drip reactant by comparing the current PH value with a target PH value, and then automatically inserting a PH meter into the reaction kettle to acquire the PH value; and (5) repeating the step (S3) to the step (S4) until the pH value in the reaction kettle reaches the target pH value range required by the polymerization reaction, and starting the reaction kettle to work.
9. An electronic device, comprising a memory and a processor, wherein the processor is used for implementing the steps of the automatic control method for the pH value of the reaction kettle according to any one of claims 1-7 when executing a computer management program stored in the memory.
10. A computer-readable storage medium, having stored thereon a computer management-like program, which when executed by a processor, performs the steps of the automatic control method for PH of a reaction vessel according to any one of claims 1 to 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211384231.8A CN115672219A (en) | 2022-11-07 | 2022-11-07 | Method and system for automatically controlling pH value of reaction kettle |
| PCT/CN2023/079327 WO2024098591A1 (en) | 2022-11-07 | 2023-03-02 | Method and system for automatically controlling ph value of reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211384231.8A CN115672219A (en) | 2022-11-07 | 2022-11-07 | Method and system for automatically controlling pH value of reaction kettle |
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| CN115672219A true CN115672219A (en) | 2023-02-03 |
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| CN202211384231.8A Pending CN115672219A (en) | 2022-11-07 | 2022-11-07 | Method and system for automatically controlling pH value of reaction kettle |
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| CN (1) | CN115672219A (en) |
| WO (1) | WO2024098591A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024098591A1 (en) * | 2022-11-07 | 2024-05-16 | 中建三局第三建设工程有限责任公司 | Method and system for automatically controlling ph value of reactor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118988228B (en) * | 2024-10-18 | 2025-02-28 | 杭州豪腾科技有限公司 | Cuprous oxide continuous production device and its control system based on parameter adjustment |
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| WO2024098591A1 (en) | 2024-05-16 |
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