CN114115374A - System and method for regulating and controlling pH value of dephenolizing device - Google Patents
System and method for regulating and controlling pH value of dephenolizing device Download PDFInfo
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 51
- 230000001276 controlling effect Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000012670 alkaline solution Substances 0.000 claims abstract description 117
- 239000002253 acid Substances 0.000 claims abstract description 53
- 230000029219 regulation of pH Effects 0.000 claims abstract description 41
- 239000000243 solution Substances 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 230000033228 biological regulation Effects 0.000 claims abstract description 17
- 239000003513 alkali Substances 0.000 claims abstract description 8
- 230000009467 reduction Effects 0.000 claims abstract description 6
- 239000003929 acidic solution Substances 0.000 claims description 59
- 230000002378 acidificating effect Effects 0.000 claims description 23
- 238000000926 separation method Methods 0.000 claims description 23
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- NESLWCLHZZISNB-UHFFFAOYSA-M sodium phenolate Chemical compound [Na+].[O-]C1=CC=CC=C1 NESLWCLHZZISNB-UHFFFAOYSA-M 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 10
- 239000002585 base Substances 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 230000003111 delayed effect Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- 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
- G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means
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Abstract
The invention discloses a system and a method for regulating and controlling the pH value of a dephenolizing device, which relate to the technical field of pH value regulation and control, firstly measuring the real-time pH value of mixed feed liquid in a pipeline, the pH controller AIC is used as a controller which plays a role of real-time control as a whole to generate a pH regulation target value, the pH regulation target value is combined with the flow of the acid solution to be used as the input of a ratio controller, the flow regulation of the alkaline solution is guided on the basis of the ratio of two variables of acid and alkali, thereby controlling the pH value in real time, overcoming the defect that the flow of the acid-base solution is not linearly changed in the traditional mode of manually regulating and controlling the feed liquid addition and reduction by taking the measurement value of the pH value on-line meter as the reference, avoiding the phenomenon of large fluctuation of the pH value, and through the cooperation of real-time feedback, the pH value is stably controlled in real time, the pH value is further controlled to be in weak acidity or alkalinity, the corrosion of equipment is delayed, and the service life of a dephenolizing device is effectively prolonged.
Description
Technical Field
The invention relates to the technical field of pH value regulation, in particular to a system and a method for regulating and controlling the pH value of a dephenolization device.
Background
The pH, also known as hydrogen ion concentration index, pH, is a measure of the activity of hydrogen ions in a solution, i.e., a measure of the acid-base degree of a solution in the general sense. The pH value is an important controlled parameter in the industrial production process, and is widely applied to the fields of petrochemical industry, biological pharmacy, wastewater treatment and the like. The quality of pH value control can directly affect the quality of products, the emission index can reach the standard, the economic benefit of enterprises and the like.
At present, an on-line pH meter is installed in a feeding pipeline of a separation tower of a dephenolizing device, and a worker manually promotes or reduces the flow of net sodium phenolate to adjust the pH value of feeding in the pipeline according to a real-time pH measured value of feeding in the pipeline measured by the on-line pH meter, so that the pH value of a feed liquid entering the separation tower meets the requirement. The method is also a common means for current pH value regulation, for example, a pH value measuring system of a desulfurizing tower is disclosed in the prior art, the desulfurizing tower is connected with a pH measuring pool through a pipeline, a pH meter is installed in the measuring pool to realize the online measurement of the pH value, but in the actual production, for example, the pH value of the feed liquid of a separation tower of a dephenolizing device is regulated and controlled, the pH value is simultaneously influenced by the concentration of the net sodium phenolate and the concentration of dilute sulfuric acid, the net sodium phenolate and the dilute sulfuric acid have different addition and subtraction amounts required for regulating the pH value under different flow rates, and when the flow rate of the dilute sulfuric acid is 0.1m3When the pH value is adjusted to 0.1, the flow of the net phenol sodium salt is adjusted to 0.1m3/h，When the flow rate of the dilute sulfuric acid is 1m3When the pH value is adjusted to 0.1, the flow of the net sodium phenolate is adjusted to 1m3There is significant non-linearity. When the acid-base concentration changes, the pH value fluctuates greatly, and generally, a worker artificially controls the pH value to a lower position, such as pH value below 3. When the feeding flow changes, the pH value can change greatly, workers repeatedly adjust the flow of the net sodium phenolate according to the online pH value measurement value to control the pH value in a lower range, which causes the pH value to fluctuate greatly for a long time, and in addition, when the pH value is at a lower position, the corrosivity is strong, the service life of equipment is shortened,
disclosure of Invention
In order to solve the problems that the traditional mode of repeatedly and manually regulating and controlling the feed liquid addition and reduction to realize the pH value regulation has high control difficulty and is easy to cause large pH value fluctuation, the invention provides a system and a method for regulating and controlling the pH value of a dephenolizing device, which avoid the large pH value fluctuation caused by the concentration change of different acid and alkali feed liquids and realize the real-time stable control of the pH value.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a system for dephenolation apparatus pH regulation comprising: the system comprises an acidic pipeline for conveying an acidic solution, an alkaline pipeline for conveying an alkaline solution, an acidic regulating valve arranged on the acidic pipeline and an alkaline regulating valve arranged on the alkaline pipeline, wherein the acidic solution in the acidic pipeline and the alkaline solution in the alkaline pipeline are mixed and then enter a separation tower through an inlet pipeline of the separation tower of a dephenolizing device; further comprising:
the pH value target setting module is used for setting the pH value target value of the mixed feed liquid entering the separation tower;
the pH value on-line measuring meter is arranged on an inlet pipeline of the separation tower and is used for measuring the real-time pH value of the mixed feed liquid in the inlet pipeline on line;
the pH value controller AIC receives the pH target value transmitted by the pH value target setting module and the real-time pH value transmitted by the pH value on-line measuring meter, compares and analyzes the real-time pH value and the pH target value, and generates a pH regulation target value;
the acidic solution flow controller is arranged on the acidic pipeline and used for monitoring the flow of the acidic solution in the acidic pipeline and controlling the flow of the acidic solution to be increased or decreased by the acidic regulating valve;
the ratio controller receives and analyzes the pH regulation target value transmitted by the pH controller AIC and the flow of the acidic solution transmitted by the acidic solution flow controller, and generates a target value for guiding the flow of the alkaline solution in the alkaline pipeline;
and the alkaline solution flow controller receives the target value of the alkaline solution flow transmitted by the ratio controller and controls the alkaline regulating valve to increase or decrease the flow of the alkaline solution.
In the technical scheme, besides the traditional pH value on-line meter is used for measuring the real-time pH value of the mixed feed liquid in the pipeline, the pH value controller AIC which plays a role of real-time control on the whole is also arranged to generate a pH control target value, the pH control target value is combined with the flow of the acidic solution to be used as the input of a ratio controller, and the flow control of the alkaline solution is guided on the basis of the ratio of two variables of acid and alkali, so that the pH value is controlled in real time, the defect that the flow of the acidic solution and the alkaline solution is nonlinearly changed in a mode of manually regulating and controlling the feed liquid and reducing only on the basis of the measurement value of the pH value on-line meter in the prior art is overcome, the phenomenon that the pH value is greatly fluctuated is avoided, and the pH value is stably controlled in real time through the cooperation of real-time feedback, so that the pH value is further controlled to be weak acidity and alkalinity, the corrosion of equipment is delayed, and the service life of the dephenolizing device is effectively prolonged; on the other hand, the system integrally realizes automatic regulation and control, and reduces the labor intensity of workers.
Preferably, the acid pipeline is further provided with an acid solution flowmeter for measuring the flow of the acid solution in the acid pipeline and transmitting the flow measurement value to the acid solution flow controller, and the acid solution flowmeter, the acid solution flow controller and the acid regulating valve form an acid flow PID control loop so as to realize the purposes of real-time feedback and stable pH control.
Preferably, the alkaline pipeline is further provided with an alkaline solution flowmeter for measuring the flow of the alkaline solution in the alkaline pipeline and transmitting the flow measurement value to the alkaline solution flow controller, and the alkaline solution flowmeter, the alkaline solution flow controller and the alkaline regulating valve form an alkaline flow PID control loop so as to realize the purposes of real-time feedback and stable pH control.
Preferably, when the pH controller AIC compares and analyzes the real-time pH value and the pH target value, the real-time pH value is set as a, the pH target value is set as b, and if a is smaller than b, the pH control target value generated by the pH controller AIC is set as b-a; if a is larger than b, the pH value control AIC generates a pH regulation target value a-b.
Preferably, when the ratio controller analyzes the pH control target value transmitted by the pH controller AIC and the flow rate of the acidic solution transmitted by the acidic solution flow rate controller, if a is smaller than b, the real-time pH value of the mixed feed liquid in the inlet pipeline is to be increased, and the pH control target value b-a is converted from the pH value corresponding to the flow rate of the acidic solution to generate a target value for guiding the flow rate of the alkaline solution in the alkaline pipeline, and the target value is used for guiding the increase of the flow rate of the alkaline solution in the alkaline pipeline.
Preferably, when the ratio controller analyzes the pH control target value transmitted by the pH controller AIC and the flow rate of the acidic solution transmitted by the acidic solution flow rate controller, if a is greater than b, the real-time pH value of the mixed feed liquid in the inlet pipeline is to be reduced, the pH control target value a-b is converted from the pH value corresponding to the flow rate of the acidic solution to generate a target value for guiding the flow rate of the alkaline solution in the alkaline pipeline, and the target value is used for guiding the reduction of the flow rate of the alkaline solution in the alkaline pipeline.
Preferably, after receiving the target value of the alkaline solution flow transmitted by the ratio controller, the alkaline solution flow controller controls the alkaline regulating valve to reduce the flow of the alkaline solution if the target value of the alkaline solution flow is larger than the current flow of the alkaline solution in the alkaline pipeline; otherwise, controlling the alkaline regulating valve to increase the flow of the alkaline solution.
Preferably, the acidic solution conveyed by the acidic pipeline is dilute sulfuric acid, and the alkaline solution conveyed by the alkaline pipeline is a net sodium phenolate solution.
The invention also provides a method for regulating and controlling the pH value of the dephenolizing device, which comprises the following steps:
s1, setting a pH target value of mixed feed liquid entering a separation tower of a dephenolizing device through a pH target setting module;
s2, starting the pipeline feeding work of the dephenolizing device, conveying an acidic solution in an acidic pipeline, conveying an alkaline solution in an alkaline pipeline, and mixing the acidic solution and the alkaline solution at an inlet pipeline of the separation tower;
s3, measuring the real-time pH value of the mixed material liquid in the inlet pipeline on line by using a pH value on-line measuring meter, and transmitting the real-time pH value to a pH value controller AIC;
s4, comparing and analyzing the real-time pH value and the pH target value by the pH value controller AIC to generate a pH regulation target value, and transmitting the pH regulation target value to the proportional controller; monitoring the flow of the acid solution in the acid pipeline by using an acid solution flow controller, and transmitting the flow to a proportional controller;
s5, the ratio controller receives and analyzes the pH regulation target value and the flow of the acid solution, generates a target value for guiding the flow of the alkaline solution in the alkaline pipeline, and transmits the target value to the alkaline solution flow controller;
and S6, controlling the flow of the alkaline solution to be increased or decreased by the alkaline regulating valve by the alkaline solution flow controller according to the target value of the alkaline solution flow transmitted by the ratio controller.
Preferably, the process of comparing and analyzing the real-time pH value and the pH target value by the pH controller AIC in step S4 is as follows:
setting the real-time pH value as a and the pH target value as b, and if a is smaller than b, setting the pH regulation target value generated by the pH controller AIC as b-a; if a is larger than b, the pH regulation target value generated by the pH controller AIC is a-b;
if a is smaller than b, the real-time pH value of the mixed material liquid in the inlet pipeline is to be increased, the pH value corresponding to the flow of the acidic solution is converted from the pH regulation target value b-a, a target value for guiding the flow of the alkaline solution in the alkaline pipeline is generated, and the flow of the alkaline solution in the alkaline pipeline is guided to be increased.
If a is larger than b, the real-time pH value of the mixed feed liquid in the inlet pipeline is to be reduced, the pH value corresponding to the flow of the acidic solution is converted from the pH regulation target value a-b, a target value for guiding the flow of the alkaline solution in the alkaline pipeline is generated, and the flow of the alkaline solution in the alkaline pipeline is guided to be reduced;
the process of analyzing the pH control target value and the flow rate of the acidic solution by the ratio controller in step S5 is as follows: if the target value of the alkaline solution flow is larger than the current flow of the alkaline solution in the alkaline pipeline, controlling an alkaline regulating valve to reduce the flow of the alkaline solution; otherwise, controlling the alkaline regulating valve to increase the flow of the alkaline solution.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention discloses a system and a method for regulating and controlling the pH value of a dephenolizing device, which utilize a pH value on-line measuring meter to measure the real-time pH value of mixed feed liquid in a pipeline, a pH value controller AIC is used as a controller which plays a role of overall real-time control to generate a pH regulation target value, the pH regulation target value is combined with the flow of the acid solution to be used as the input of a ratio controller, the flow regulation of the alkaline solution is guided on the basis of the ratio of two variables of acid and alkali, thereby controlling the pH value in real time, overcoming the defect that the flow of the acid-base solution is not linearly changed in the traditional mode of manually regulating and controlling the feed liquid addition and reduction by taking the measurement value of the pH value on-line meter as the reference, avoiding the phenomenon of large fluctuation of the pH value, the pH value is stably controlled in real time through the cooperation of real-time feedback, so that the pH value is further controlled to be weak in acidity and alkalinity, the corrosion of equipment is delayed, and the service life of a dephenolizing device is effectively prolonged; on the other hand, the system integrally realizes automatic regulation and control, and reduces the labor intensity of workers.
Drawings
FIG. 1 is a schematic view showing the overall configuration of a system for pH control of a dephenolation apparatus proposed in example 1 of the present invention;
FIG. 2 is a data flow diagram illustrating pH control based on the system shown in FIG. 1, according to the present invention in example 1;
FIG. 3 shows a flow chart of the method for pH control of a dephenolation apparatus set forth in example 3 of the present invention.
Wherein, 1, acid pipeline; 2. an alkaline pipeline; 3. an acidity regulating valve; 4. an alkaline regulating valve; 5. a separation column; 6. an inlet duct; a pH value target setting module; 8, measuring the pH value on line; pH controller AIC; 10. an acidic solution flow controller; 11. a ratio controller; 12. an alkaline solution flow controller; 13. an acid solution flow meter; 14. an alkaline solution flow meter; 111. an acid flow PID control loop; 112. alkaline flow PID control loop.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
Install the online meter of pH value in the feeding inlet pipeline of dephenolization device knockout tower, the staff is according to the real-time pH measured value of feeding in the online meter measuring pipeline of pH value, the pH value of feeding in the pipeline is adjusted to manual promotion or reduction net phenol sodium salt flow, thereby make the feed liquid pH valve in getting into the knockout tower meet the requirements, nevertheless manual regulation and control feed liquid adds the mode that the decrement realized pH value and adjusts repeatedly, the control degree of difficulty is big, cause the undulant big problem of pH value easily, and can increase staff's intensity of labour. In order to solve the above problems, in this embodiment, a system for regulating pH of a dephenolizing device is provided, referring to fig. 1, where pH of a feed liquid is regulated before the feed liquid enters a separation tower of the dephenolizing device, referring to fig. 1, the system includes: an acid pipeline 1 for conveying an acid solution, an alkaline pipeline 2 for conveying an alkaline solution, an acid regulating valve 3 arranged on the acid pipeline 1, and an alkaline regulating valve 4 arranged on the alkaline pipeline 2, wherein in the embodiment, the acid solution is dilute sulfuric acid, the alkaline solution is a net sodium phenolate solution, the acid solution of the acid pipeline 1 and the alkaline solution of the alkaline pipeline 2 are mixed and then enter a separation tower 5 through an inlet pipeline 6 of a separation tower 5 of a dephenolizing device, and a pH value target setting module 7 is arranged in the system for setting a pH target value of a mixed feed liquid entering the separation tower 5, wherein the pH target value meets requirements; further comprising:
the online pH value measuring meter 8 is arranged on the inlet pipeline 6 of the separation tower 5 and used for online measuring the real-time pH value of the mixed feed liquid in the inlet pipeline 6;
a pH controller AIC, the label of which is 9, receives the pH target value transmitted by the pH target setting module 7 and the real-time pH value transmitted by the pH on-line measuring meter 8, compares and analyzes the real-time pH value and the pH target value, and generates a pH regulation target value;
the acid solution flow controller 10 is arranged on the acid pipeline 1 and used for monitoring the flow of the acid solution in the acid pipeline 1 and controlling the acid regulating valve 3 to increase or decrease the flow of the acid solution;
a ratio controller 11 for receiving and analyzing the pH control target value transmitted from the pH controller AIC and the flow rate of the acidic solution transmitted from the acidic solution flow rate controller 10 to generate a target value for guiding the flow rate of the alkaline solution in the alkaline pipeline 2;
the alkaline solution flow controller 12 receives the target value of the alkaline solution flow transmitted from the ratio controller 11, and controls the alkaline control valve 4 to increase or decrease the flow of the alkaline solution.
Referring to fig. 1, in addition to the conventional online pH meter 8 arranged on the inlet pipeline 6 for measuring the real-time pH value of the mixed feed liquid in the pipeline, a pH controller AIC is introduced for generally performing real-time control, a target pH value generated by a real-time pH value and pH value target setting module 7 is used as the input of the pH controller AIC (the flow direction of a dotted arrow in fig. 1 represents data input), a target pH value is generated, the target pH value is used together with the flow of the acidic solution as the input of a ratio controller, the flow regulation of the alkaline solution is guided based on the ratio of two variables, so as to control the pH value in real time, the data flow block diagram of the system for performing pH value regulation can refer to fig. 2, and the whole flow can overcome the defect that the flow of the acidic solution and alkaline solution is nonlinearly changed in the conventional manner of manually regulating and decreasing the feed liquid based on the measurement value of the online pH meter, the phenomenon of large fluctuation of the pH value is avoided, and the pH value is stably controlled in real time through the cooperation of real-time feedback, so that the pH value is further controlled to be weak in acidity and alkalinity, the corrosion of equipment is delayed, and the service life of a dephenolizing device is effectively prolonged; on the other hand, the system integrally realizes automatic regulation and control, and reduces the labor intensity of workers.
In this embodiment, when the pH controller AIC compares and analyzes the real-time pH value and the pH target value, the real-time pH value is set as a, the pH target value is set as b, and if a is smaller than b (which indicates that the actual acidity of the solution is too high), the pH control target value generated by the pH controller AIC is set as b-a; if a is larger than b (which indicates that the actual alkalinity of the solution is too large), the pH control target value generated by the pH controller AIC is a-b.
When the ratio controller 11 analyzes the pH control target value transmitted by the pH controller AIC and the flow rate of the acidic solution transmitted by the acidic solution flow rate controller 10, if a is smaller than b, the real-time pH value of the mixed feed liquid in the inlet pipeline 6 is to be increased, the pH control target value b-a is converted with the pH value corresponding to the flow rate of the acidic solution, a target value for guiding the flow rate of the alkaline solution in the alkaline pipeline 2 is generated, and the flow rate of the alkaline solution in the alkaline pipeline 2 is guided to be increased; if a is larger than b, the real-time pH value of the mixed material liquid in the inlet pipeline 6 is to be reduced, the pH value corresponding to the flow of the acidic solution is converted from the pH regulation target value a-b, a target value for guiding the flow of the alkaline solution in the alkaline pipeline 2 is generated, and the flow of the alkaline solution in the alkaline pipeline 2 is guided to be reduced.
In the present embodiment, after receiving the target value of the alkaline solution flow transmitted by the ratio controller 11, the alkaline solution flow controller 12 controls the alkaline regulating valve 4 to reduce the flow of the alkaline solution if the target value of the alkaline solution flow is larger than the current flow of the alkaline solution in the alkaline pipeline 2; otherwise, the alkali adjusting valve 4 is controlled to increase the flow rate of the alkali solution.
Example 2
In this embodiment, the acid pipe 1 is further provided with an acid solution flow meter 13, the acid solution flow meter 13 is configured to measure a flow rate of the acid solution in the acid pipe 1, and transmit the flow rate measurement value to the acid solution flow controller 10, referring to fig. 1, the acid solution flow meter 13, the acid solution flow controller 12, and the acid regulating valve 3 form an acid flow PID control loop 111, so as to achieve the purpose of real-time feedback and stable pH control.
Preferably, the alkaline pipeline 2 is further provided with an alkaline solution flow meter 14 for measuring the flow rate of the alkaline solution in the alkaline pipeline 2 and transmitting the flow rate measurement value to the alkaline solution flow controller, and the alkaline solution flow meter 14, the alkaline solution flow controller 12 and the alkaline regulating valve 4 form an alkaline flow PID control loop 112 to achieve the purposes of real-time feedback and stable pH control.
Example 3
Referring to fig. 3, based on the systems of example 1 and example 2, this embodiment proposes a method for pH control of a dephenolation apparatus, which includes the following steps:
s1, setting a pH target value of mixed feed liquid entering a separation tower of a dephenolizing device through a pH target setting module;
s2, starting the pipeline feeding work of the dephenolizing device, conveying an acidic solution in an acidic pipeline, conveying an alkaline solution in an alkaline pipeline, and mixing the acidic solution and the alkaline solution at an inlet pipeline of the separation tower;
s3, measuring the real-time pH value of the mixed material liquid in the inlet pipeline on line by using a pH value on-line measuring meter, and transmitting the real-time pH value to a pH value controller AIC;
s4, comparing and analyzing the real-time pH value and the pH target value by the pH value controller AIC to generate a pH regulation target value, and transmitting the pH regulation target value to the proportional controller; monitoring the flow of the acid solution in the acid pipeline by using an acid solution flow controller, and transmitting the flow to a proportional controller;
s5, the ratio controller receives and analyzes the pH regulation target value and the flow of the acid solution, generates a target value for guiding the flow of the alkaline solution in the alkaline pipeline, and transmits the target value to the alkaline solution flow controller;
and S6, controlling the flow of the alkaline solution to be increased or decreased by the alkaline regulating valve by the alkaline solution flow controller according to the target value of the alkaline solution flow transmitted by the ratio controller.
In this embodiment, the process of comparing and analyzing the real-time pH value and the pH target value by the pH controller AIC described in step S4 is as follows:
setting the real-time pH value as a and the pH target value as b, and if a is smaller than b, setting the pH regulation target value generated by the pH controller AIC as b-a; if a is larger than b, the pH regulation target value generated by the pH controller AIC is a-b;
if a is smaller than b, the real-time pH value of the mixed material liquid in the inlet pipeline is to be increased, the pH value corresponding to the flow of the acidic solution is converted from the pH regulation target value b-a, a target value for guiding the flow of the alkaline solution in the alkaline pipeline is generated, and the flow of the alkaline solution in the alkaline pipeline is guided to be increased.
If a is larger than b, the real-time pH value of the mixed feed liquid in the inlet pipeline is to be reduced, the pH value corresponding to the flow of the acidic solution is converted from the pH regulation target value a-b, a target value for guiding the flow of the alkaline solution in the alkaline pipeline is generated, and the flow of the alkaline solution in the alkaline pipeline is guided to be reduced;
the process of analyzing the pH control target value and the flow rate of the acidic solution by the ratio controller in step S5 is as follows: if the target value of the alkaline solution flow is larger than the current flow of the alkaline solution in the alkaline pipeline, controlling an alkaline regulating valve to reduce the flow of the alkaline solution; otherwise, controlling the alkaline regulating valve to increase the flow of the alkaline solution.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A system for pH regulation in a dephenolation apparatus comprising: the system comprises an acidic pipeline (1) for conveying acidic solution, an alkaline pipeline (2) for conveying alkaline solution, an acidic regulating valve (3) arranged on the acidic pipeline (1), and an alkaline regulating valve (4) arranged on the alkaline pipeline (2), wherein the acidic solution in the acidic pipeline (1) and the alkaline solution in the alkaline pipeline (2) are mixed and then enter a separation tower (5) through an inlet pipeline (6) of the separation tower (5) of a dephenolizing device; further comprising:
a pH value target setting module (7) for setting a pH value target value of the mixed feed liquid entering the separation tower (5);
the pH value on-line measuring meter (8) is arranged on an inlet pipeline (6) of the separation tower and is used for measuring the real-time pH value of the mixed feed liquid in the inlet pipeline (6) on line;
the pH value controller AIC (9) receives the pH target value transmitted by the pH value target setting module (7) and the real-time pH value transmitted by the pH value on-line measuring meter (8), compares and analyzes the real-time pH value and the pH target value, and generates a pH regulation target value;
the acidic solution flow controller (10) is arranged on the acidic pipeline (1) and is used for monitoring the flow of the acidic solution in the acidic pipeline (1) and controlling the flow of the acidic solution to be increased or decreased by the acidic regulating valve (3);
the ratio controller (11) receives and analyzes the pH regulation target value transmitted by the pH controller AIC (9) and the flow of the acidic solution transmitted by the acidic solution flow controller (10), and generates a target value for guiding the flow of the alkaline solution in the alkaline pipeline (2);
and an alkaline solution flow controller (12) which receives the target value of the alkaline solution flow transmitted by the ratio controller (11) and controls the addition and subtraction of the alkaline solution flow by the alkaline regulating valve (4).
2. The system for regulating and controlling the pH value of the dephenolizing device according to claim 1, wherein an acidic solution flow meter (13) is further arranged on the acidic pipeline (1) and used for measuring the flow rate of the acidic solution in the acidic pipeline (1) and transmitting the flow rate measured value to the acidic solution flow controller (10), and the acidic solution flow meter (13), the acidic solution flow controller (10) and the acidic regulating valve (3) form an acidic flow PID control loop (111).
3. The system for regulating and controlling the pH value of the dephenolizing device according to claim 2, wherein an alkaline solution flow meter (14) is further arranged on the alkaline pipeline (2) and used for measuring the flow rate of the alkaline solution in the alkaline pipeline (2) and transmitting the flow rate measured value to the alkaline solution flow controller (12), and the alkaline solution flow meter (14), the alkaline solution flow controller (12) and the alkaline regulating valve (4) form an alkaline flow PID control loop (112).
4. The system for pH value regulation and control of a dephenolizing device according to claim 3, wherein when the pH value controller AIC (9) compares and analyzes the real-time pH value with the pH target value, the real-time pH value is set as a, the pH target value is set as b, and if a is less than b, the pH value controller AIC (9) generates the pH regulation target value as b-a; if a is larger than b, the pH value control AIC (9) generates a pH regulation target value a-b.
5. The system for pH value regulation and control of a dephenolizing device according to claim 4, wherein when the ratio controller (11) analyzes the pH regulation target value transmitted by the pH controller AIC (9) and the flow rate of the acidic solution transmitted by the acidic solution flow rate controller (10), if a is smaller than b, the real-time pH value of the mixed material liquid in the inlet pipeline (6) is to be increased, and the pH value corresponding to the pH regulation target value b-a and the flow rate of the acidic solution is converted to generate a target value for guiding the flow rate of the alkaline solution in the alkaline pipeline (2) and guiding the increase of the flow rate of the alkaline solution in the alkaline pipeline (2).
6. The system for pH value regulation and control of a dephenolizing device according to claim 5, wherein when the ratio controller (11) analyzes the pH regulation target value transmitted by the pH controller AIC (9) and the flow rate of the acidic solution transmitted by the acidic solution flow rate controller (10), if a is larger than b, the real-time pH value of the mixed material liquid in the inlet pipeline (6) is to be reduced, and the pH values corresponding to the pH regulation target values a-b and the flow rate of the acidic solution are converted to generate a target value for guiding the flow rate of the alkaline solution in the alkaline pipeline (2) and guiding the reduction of the flow rate of the alkaline solution in the alkaline pipeline (2).
7. The system for pH value regulation and control of a dephenolizing device according to claim 6, wherein the alkaline solution flow controller (12) controls the alkaline regulating valve (4) to reduce the flow rate of the alkaline solution if the target value of the alkaline solution flow rate is larger than the current flow rate of the alkaline solution in the alkaline pipeline (2) after receiving the target value of the alkaline solution flow rate transmitted by the ratio controller (11); otherwise, the alkali regulating valve (4) is controlled to increase the flow of the alkali solution.
8. The system for dephenolation plant pH value regulation according to claim 1, wherein the acidic solution conveyed by the acidic pipeline (1) is dilute sulfuric acid, and the alkaline solution conveyed in the alkaline pipeline (2) is a net sodium phenolate solution.
9. A method for pH regulation in a dephenolation apparatus, said method comprising the steps of:
s1, setting a pH target value of mixed feed liquid entering a separation tower of a dephenolizing device through a pH target setting module;
s2, starting the pipeline feeding work of the dephenolizing device, conveying an acidic solution in an acidic pipeline, conveying an alkaline solution in an alkaline pipeline, and mixing the acidic solution and the alkaline solution at an inlet pipeline of the separation tower;
s3, measuring the real-time pH value of the mixed material liquid in the inlet pipeline on line by using a pH value on-line measuring meter, and transmitting the real-time pH value to a pH value controller AIC;
s4, comparing and analyzing the real-time pH value and the pH target value by the pH value controller AIC to generate a pH regulation target value, and transmitting the pH regulation target value to the proportional controller; monitoring the flow of the acid solution in the acid pipeline by using an acid solution flow controller, and transmitting the flow to a proportional controller;
s5, the ratio controller receives and analyzes the pH regulation target value and the flow of the acid solution, generates a target value for guiding the flow of the alkaline solution in the alkaline pipeline, and transmits the target value to the alkaline solution flow controller;
and S6, controlling the flow of the alkaline solution to be increased or decreased by the alkaline regulating valve by the alkaline solution flow controller according to the target value of the alkaline solution flow transmitted by the ratio controller.
10. The method for controlling the pH of a dephenolizing device according to claim 9, wherein the process of comparing and analyzing the real-time pH value and the target pH value by the pH controller AIC in step S4 is as follows:
setting the real-time pH value as a and the pH target value as b, and if a is smaller than b, setting the pH regulation target value generated by the pH controller AIC as b-a; if a is larger than b, the pH regulation target value generated by the pH controller AIC is a-b;
if a is smaller than b, the real-time pH value of the mixed material liquid in the inlet pipeline is to be increased, the pH value corresponding to the flow of the acidic solution is converted from the pH regulation target value b-a, a target value for guiding the flow of the alkaline solution in the alkaline pipeline is generated, and the flow of the alkaline solution in the alkaline pipeline is guided to be increased.
If a is larger than b, the real-time pH value of the mixed feed liquid in the inlet pipeline is to be reduced, the pH value corresponding to the flow of the acidic solution is converted from the pH regulation target value a-b, a target value for guiding the flow of the alkaline solution in the alkaline pipeline is generated, and the flow of the alkaline solution in the alkaline pipeline is guided to be reduced;
the process of analyzing the pH control target value and the flow rate of the acidic solution by the ratio controller in step S5 is as follows: if the target value of the alkaline solution flow is larger than the current flow of the alkaline solution in the alkaline pipeline, controlling an alkaline regulating valve to reduce the flow of the alkaline solution; otherwise, controlling the alkaline regulating valve to increase the flow of the alkaline solution.
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