CN113082759A - Automatic control system and control method for bromine distillation tower - Google Patents
Automatic control system and control method for bromine distillation tower Download PDFInfo
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- CN113082759A CN113082759A CN202110490432.5A CN202110490432A CN113082759A CN 113082759 A CN113082759 A CN 113082759A CN 202110490432 A CN202110490432 A CN 202110490432A CN 113082759 A CN113082759 A CN 113082759A
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- 238000004821 distillation Methods 0.000 title claims abstract description 54
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 title claims abstract description 53
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052794 bromium Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 18
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 41
- 239000000460 chlorine Substances 0.000 claims abstract description 41
- 230000003068 static effect Effects 0.000 claims description 15
- 230000004044 response Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 5
- 239000000376 reactant Substances 0.000 claims description 5
- 239000012452 mother liquor Substances 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000009699 differential effect Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 6
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/09—Bromine; Hydrogen bromide
- C01B7/096—Bromine
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The embodiment of the invention provides an automatic control system and a control method for a bromine distillation tower, which comprises the following steps: the system comprises an image acquisition camera arranged at the position of a window of a bromine distillation tower, a temperature sensor arranged at the top of the bromine distillation tower, a chlorine valve arranged on a chlorine pipeline of the bromine distillation tower, a steam valve arranged on a steam pipeline of the bromine distillation tower, a pressure sensor arranged on an outlet pipeline of the steam valve, an industrial personal computer and a controller; the image acquisition camera is connected with the industrial personal computer; the industrial personal computer is connected with the controller; the controller is connected with the temperature sensor, the chlorine valve, the steam valve and the pressure sensor. By applying the scheme provided by the embodiment of the invention, the automation degree of bromine extraction can be improved, and the operation intensity of an operator can be reduced.
Description
Technical Field
The invention relates to the technical field of automatic control of bromine extraction, in particular to an automatic control system and a control method for a bromine distillation tower.
Background
Distillation is a very important link in bromine extraction, and the control of the distillation process determines the yield and quality of bromine to a great extent. In the traditional process, an operator observes the color change of reactants in a distillation tower through a window on the distillation tower to determine the position of a reaction section, and then adjusts the opening degree of a chlorine valve to ensure the stability of the position of the reaction section. The operation process is more subjective and depends on personal experience, so that the control process is unstable and has large fluctuation, and the yield and the quality of products are finally influenced.
Disclosure of Invention
The embodiment of the invention provides an automatic control system and a control method for a bromine distillation tower, which aim to achieve the technical effect of improving the automatic production level of bromine extraction.
In one aspect of the present invention, there is provided an automatic control system for a bromine distillation column, comprising: the system comprises an image acquisition camera arranged at the position of a window of a bromine distillation tower, a temperature sensor arranged at the top of the bromine distillation tower, a chlorine valve arranged on a chlorine pipeline of the bromine distillation tower, a steam valve arranged on a steam pipeline of the bromine distillation tower, a pressure sensor arranged on an outlet pipeline of the steam valve, an industrial personal computer and a controller;
the image acquisition camera is connected with the industrial personal computer;
the industrial personal computer is connected with the controller;
the controller is connected with the temperature sensor, the chlorine valve, the steam valve and the pressure sensor.
Compared with the prior art, the invention has the beneficial effects that: by applying the scheme provided by the embodiment of the invention, the opening degree of the steam valve is automatically adjusted by utilizing the collected temperature value in the tower and the pressure value after the valve, so that the temperature in the tower is automatically stabilized within a certain range; and after the temperature is stable, the real-time position of the reaction section is automatically identified by using an image identification technology, and the opening degree of the chlorine valve is automatically adjusted by using a deviation value between the real-time position and the target position, so that the automation degree of bromine extraction is improved, and the operation intensity of an operator is reduced.
Optionally, a dark shield is sleeved outside the bromine distillation tower window and the image acquisition camera.
Optionally, the image capturing camera includes: the device comprises a first image acquisition camera arranged at the position of an upper window of the bromine distillation tower and a second image acquisition camera arranged at the position of a lower window of the bromine distillation tower.
Optionally, the controller is a PLC controller.
In another aspect of the present invention, there is provided a method for automatically controlling a bromine distillation column, comprising:
the industrial personal computer obtains a target temperature value for temperature control and a target position value for controlling the position of the reaction section, and transmits the target temperature value and the target position value to the controller;
the pressure sensor acquires a pressure value behind the steam valve and transmits the pressure value behind the steam valve to the controller;
the temperature sensor collects the temperature value in the bromine distillation tower and transmits the temperature value to the controller;
the method comprises the following steps that image acquisition equipment acquires a real-time image of a reaction between mother liquor containing HBr in a bromine distillation tower and chlorine, the real-time position of a reaction section is identified based on the color of reactants in the real-time image, the real-time position is sent to an industrial personal computer, and the industrial personal computer transmits the real-time position to a controller;
the controller calculates a temperature deviation value between the temperature value and the target temperature value, the temperature deviation value is used as the input of a preset temperature PID control model, and a pressure set value is calculated through the preset temperature PID control model;
calculating a pressure deviation value between a pressure set value and a post-valve pressure value, taking the pressure deviation value as an input of a preset pressure PID control model, calculating an opening set value of the steam valve through the preset pressure PID control model, and adjusting the opening of the steam valve by using the opening set value;
and calculating a position deviation value between the real-time position and the target position, taking the position deviation value as the input of a preset chlorine PID control model, calculating to obtain an opening set value of the chlorine valve through the preset chlorine PID control model, and adjusting the opening of the chlorine valve by using the opening set value.
Optionally, the preset temperature PID control model and the preset pressure PID control model are models obtained by setting parameters Kp, Tt and Td of the initial PID control model based on a change rule that the opening of the steam valve is larger, and the pressure value after the steam valve and the temperature value in the distillation tower are larger;
the preset chlorine PID control model is a model obtained by setting Kp, Tt and Td parameters of the initial PID control model based on the control rule that the chlorine flow increasing reaction section position rises and the chlorine flow decreasing reaction section position falls.
Optionally, the setting of the Kp, Tt, and Td parameters of the initial PID control model includes:
setting the integral coefficient Tt to infinity, setting the differential coefficient Td to zero, canceling integral and differential actions, modifying the proportional coefficient Kp from small to large, observing the response of the system until the response speed is high and the overshoot of a certain range exists, and if the static difference of the system is within a specified range and the response curve meets the design requirement, finishing the parameter setting;
if the static difference of the system does not meet the design requirement, gradually reducing the integral coefficient Tt, observing the output of the model until the static difference of the system is gradually reduced, and the speed of eliminating the static difference meets the design requirement;
if the design requirement can not be met after the above two steps of parameter setting, gradually increasing the differential coefficient Td, observing overshoot and stability, and simultaneously correspondingly fine-adjusting the proportional coefficient Kp and the integral coefficient Tt until the static difference and the speed of system adjustment reach the design requirement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an automatic control system of a bromine distillation tower provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Referring to fig. 1, an automatic control system of a bromine distillation column provided by the embodiment of the present invention includes: the system comprises an image acquisition camera arranged at the position of a window of a bromine distillation tower, a temperature sensor arranged at the top of the bromine distillation tower, a chlorine valve arranged on a chlorine pipeline of the bromine distillation tower, a steam valve arranged on a steam pipeline of the bromine distillation tower, a pressure sensor arranged on an outlet pipeline of the steam valve, an industrial personal computer and a controller;
the image acquisition camera is connected with the industrial personal computer;
the industrial personal computer is connected with the controller;
the controller is connected with the temperature sensor, the chlorine valve, the steam valve and the pressure sensor.
In the implementation, the dark color shields are sleeved outside the window of the bromine distillation tower and the image acquisition camera, so that the phenomenon that the colors of the reactants in the acquired window are deviated due to the change of external natural light is avoided.
In an implementation, an image capture camera includes: the device comprises a first image acquisition camera arranged at the position of an upper window of the bromine distillation tower and a second image acquisition camera arranged at the position of a lower window of the bromine distillation tower.
In implementation, the controller is a PLC controller.
In the bromine distillation column automatic control process:
the industrial personal computer obtains a target temperature value for temperature control and a target position value for controlling the position of the reaction section, and transmits the target temperature value and the target position value to the controller;
the pressure sensor acquires a pressure value behind the steam valve and transmits the pressure value behind the steam valve to the controller;
the temperature sensor collects the temperature value in the bromine distillation tower and transmits the temperature value to the controller;
the method comprises the following steps that image acquisition equipment acquires a real-time image of a reaction between mother liquor containing HBr in a bromine distillation tower and chlorine, the real-time position of a reaction section is identified based on the color of reactants in the real-time image, the real-time position is sent to an industrial personal computer, and the industrial personal computer transmits the real-time position to a controller; in the implementation, the mother solution rich in HBr is sprayed from top to bottom, and the chlorine gas introduced from the bottom moves from bottom to top, the former is orange red, and the latter is cyan, so that the position of the reaction section of the contact of the two is easily determined by color. In this embodiment, the optimal reaction zone position is in the upper window, and the mother liquor flows downwards from the top of the tower, just passes through the upper edge of the upper window but does not pass through the center of the upper window. If the chlorine flow is large, the position of the reaction section can be upwards topped, and if the chlorine flow is small, the position of the reaction section can sink, so that the control of the position of the reaction section can be realized by adjusting the opening degree of a chlorine valve.
The controller calculates a temperature deviation value between the temperature value and the target temperature value, the temperature deviation value is used as the input of a preset temperature PID control model, and a pressure set value is calculated through the preset temperature PID control model;
calculating a pressure deviation value between a pressure set value and a post-valve pressure value, taking the pressure deviation value as an input of a preset pressure PID control model, calculating an opening set value of the steam valve through the preset pressure PID control model, and adjusting the opening of the steam valve by using the opening set value; in the implementation, the hysteresis property of the temperature and the positive correlation relationship between the temperature and the pressure are considered, so the control process introduces the pressure after the valve to form cascade PID control, namely the pressure after the valve is controlled according to the temperature difference of the tower temperature, and then the opening degree of the steam valve is controlled according to the deviation of the set value and the actual value of the pressure after the valve; specifically, the pressure in the tower is stabilized through a preset pressure PID control model, and then the temperature of the tower is controlled through the tower pressure. Wherein the deviation of the collected tower temperature and the set target temperature (82 ℃) is used as the input of a preset temperature PID control model, and the pressure set value is used as the output of the temperature PID control model; and then the deviation of the actual tower pressure and the pressure set value is used as the input of a preset pressure PID control model, and the steam valve opening set value is used as the output of the preset pressure PID control model. The input and the output are controlled by PID model parameters, so that the adjustment of the opening of the steam valve can automatically control the tower temperature to fluctuate up and down by a small margin near a set value.
In the implementation, the pressure in the tower fluctuates sharply due to poor stability of steam input, so in the process of calculating the pressure deviation value between the pressure set value and the pressure value after the valve, the average value of the pressure value after the valve within a certain time can be counted to calculate the pressure deviation value, and the influence caused by sharp fluctuation of the pressure in the tower is reduced.
And calculating a position deviation value between the real-time position and the target position, taking the position deviation value as the input of a preset chlorine PID control model, calculating to obtain an opening set value of the chlorine valve through the preset chlorine PID control model, and adjusting the opening of the chlorine valve by using the opening set value.
Specifically, the preset value temperature PID control model and the preset pressure PID control model are models obtained by setting parameters Kp, Tt and Td of the initial PID control model based on a change rule that the opening of the steam valve is larger, the pressure value after the valve is larger, and the temperature value in the distillation tower is larger;
the preset chlorine PID control model is a model obtained by setting Kp, Tt and Td parameters of the initial PID control model based on the control rule that the chlorine flow increasing reaction section position rises and the chlorine flow decreasing reaction section position falls.
In an implementation, the setting of the Kp, Tt, Td parameters of the initial PID control model includes:
setting the integral coefficient Tt to infinity, setting the differential coefficient Td to zero, canceling integral and differential actions, modifying the proportional coefficient Kp from small to large, observing the response of the system until the response speed is high and the overshoot of a certain range exists, and if the static difference of the system is within a specified range and the response curve meets the design requirement, finishing the parameter setting;
if the static difference of the system does not meet the design requirement, gradually reducing the integral coefficient Tt, observing the output of the model until the static difference of the system is gradually reduced, and the speed of eliminating the static difference meets the design requirement;
if the design requirement can not be met after the above two steps of parameter setting, gradually increasing the differential coefficient Td, observing overshoot and stability, and simultaneously correspondingly fine-adjusting the proportional coefficient Kp and the integral coefficient Tt until the static difference and the speed of system adjustment reach the design requirement.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. An automatic control system for a bromine distillation tower, comprising: the system comprises an image acquisition camera arranged at the position of a window of a bromine distillation tower, a temperature sensor arranged at the top of the bromine distillation tower, a chlorine valve arranged on a chlorine pipeline of the bromine distillation tower, a steam valve arranged on a steam pipeline of the bromine distillation tower, a pressure sensor arranged on an outlet pipeline of the steam valve, an industrial personal computer and a controller;
the image acquisition camera is connected with the industrial personal computer;
the industrial personal computer is connected with the controller;
the controller is connected with the temperature sensor, the chlorine valve, the steam valve and the pressure sensor.
2. The bromine distillation tower automatic control system of claim 1, wherein a dark shield is sleeved outside the bromine distillation tower window and the image acquisition camera.
3. The bromine distillation column automatic control system of claim 1, wherein the image acquisition camera comprises: the device comprises a first image acquisition camera arranged at the position of an upper window of the bromine distillation tower and a second image acquisition camera arranged at the position of a lower window of the bromine distillation tower.
4. The bromine distillation column automatic control system of claim 1, wherein the controller is a PLC controller.
5. An automatic control method for a bromine distillation column, which is applied to the automatic control system according to any one of claims 1 to 4, comprising:
the industrial personal computer obtains a target temperature value for temperature control and a target position value for controlling the position of the reaction section, and transmits the target temperature value and the target position value to the controller;
the pressure sensor acquires a pressure value behind the steam valve and transmits the pressure value behind the steam valve to the controller;
the temperature sensor collects the temperature value in the bromine distillation tower and transmits the temperature value to the controller;
the method comprises the following steps that image acquisition equipment acquires a real-time image of a reaction between mother liquor containing HBr in a bromine distillation tower and chlorine, the real-time position of a reaction section is identified based on the color of reactants in the real-time image, the real-time position is sent to an industrial personal computer, and the industrial personal computer transmits the real-time position to a controller;
the controller calculates a temperature deviation value between the temperature value and the target temperature value, the temperature deviation value is used as the input of a preset temperature PID control model, and a pressure set value is calculated through the preset temperature PID control model;
calculating a pressure deviation value between a pressure set value and a post-valve pressure value, taking the pressure deviation value as an input of a preset pressure PID control model, calculating an opening set value of the steam valve through the preset pressure PID control model, and adjusting the opening of the steam valve by using the opening set value;
and calculating a position deviation value between the real-time position and the target position, taking the position deviation value as the input of a preset chlorine PID control model, calculating to obtain an opening set value of the chlorine valve through the preset chlorine PID control model, and adjusting the opening of the chlorine valve by using the opening set value.
6. The method of automatically controlling a bromine distillation column according to claim 1,
the preset value temperature PID control model and the preset pressure PID control model are models obtained by setting parameters Kp, Tt and Td of the initial PID control model based on a change rule that the opening of a steam valve is larger, and the pressure value behind the steam valve and the temperature value in the distillation tower are larger;
the preset chlorine PID control model is a model obtained by setting Kp, Tt and Td parameters of the initial PID control model based on the control rule that the chlorine flow increasing reaction section position rises and the chlorine flow decreasing reaction section position falls.
7. The method of claim 6, wherein the setting of the Kp, Tt, Td parameters of the initial PID control model comprises:
setting the integral coefficient Tt to infinity, setting the differential coefficient Td to zero, canceling integral and differential actions, modifying the proportional coefficient Kp from small to large, observing the response of the system until the response speed is high and the overshoot of a certain range exists, and if the static difference of the system is within a specified range and the response curve meets the design requirement, finishing the parameter setting;
if the static difference of the system does not meet the design requirement, gradually reducing the integral coefficient Tt, observing the output of the model until the static difference of the system is gradually reduced, and the speed of eliminating the static difference meets the design requirement;
if the design requirement can not be met after the above two steps of parameter setting, gradually increasing the differential coefficient Td, observing overshoot and stability, and simultaneously correspondingly fine-adjusting the proportional coefficient Kp and the integral coefficient Tt until the static difference and the speed of system adjustment reach the design requirement.
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| CN202110490432.5A CN113082759A (en) | 2021-05-06 | 2021-05-06 | Automatic control system and control method for bromine distillation tower |
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| CN202110490432.5A CN113082759A (en) | 2021-05-06 | 2021-05-06 | Automatic control system and control method for bromine distillation tower |
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Cited By (2)
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| CN114200981A (en) * | 2021-11-04 | 2022-03-18 | 金盛海洋科技有限公司 | Distillation tower top temperature control system and method |
| CN114933283A (en) * | 2022-04-24 | 2022-08-23 | 天津长芦汉沽盐场有限责任公司 | Production process of bromine from desalted concentrated seawater |
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