CN108958026B - Optimized control method and system for heavy component separation system in chemical production - Google Patents
Optimized control method and system for heavy component separation system in chemical production Download PDFInfo
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Abstract
The invention provides an optimization control method and system for a heavy component separation system in chemical production, wherein the method comprises the following steps: optimally controlling the flow of the heat exchanger of the component separation system according to the input value of the automatic temperature difference controller and the measured value of the flow of the heat medium outlet of the heat exchanger; optimally controlling the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow; and optimally controlling the reflux quantity of the heavy component separation system according to the preset reflux quantity parameter and the reflux quantity measured value of the heavy component separation system, and optimally controlling the feed quantity of the heavy component separation system according to the reflux quantity measured value and the upstream disturbance quantity in the heavy component separation system. The invention can carry out comprehensive full-automatic stable optimization control on the heavy component separation system on the whole, greatly improves the production efficiency and the operation stability, improves the precision of heavy component discharge control, and reduces the energy consumption and the material consumption.
Description
Technical Field
The invention relates to the technical field of chemical production, in particular to an optimization control method and system for a heavy component separation system in chemical production.
Background
In the chemical production process, heavy components are also called high boiling point components, which refer to components with boiling points higher than key components in the multi-component solution rectification, and a heavy component separation system is a system for separating the heavy components from the key components (products). The conventional control scheme of the heavy component separation system comprises single-loop control of the reflux quantity and the feeding quantity of the system, a cascade loop formed by the reflux quantity and the temperature difference (namely, the heating quantity) of heat conduction oil, and manual control of the discharge quantity of the heavy components. The control scheme has obvious defects that the actual dynamic response time of the system is long after the reflux quantity is changed, and the tower control loop cannot be put into automation or cannot stably run for a long period after the tower control loop is put into automation; the traditional control scheme does not consider the automatic control of heavy component discharging, and the material consumption is increased when the discharging is excessive; the temperature of the tower kettle is not automatically adjusted and controlled.
FIG. 1 shows the operation flow of a heavy component separation system in a chemical industry enterprise in the prior art, and the manual operation of the whole process after the system is disturbed makes the labor intensity of operators large and the production efficiency low; meanwhile, if the operation is improper, the material consumption and the energy consumption are increased, and the product quality is unstable.
In the prior art, the discharge of the heavy component separation system is controlled by temperature control, but the stability of the heavy component separation system is affected, so that the reflux amount, the upstream disturbance amount and the like exist, and the effective and comprehensive optimization of the heavy component separation system cannot be realized by only carrying out the temperature control.
Therefore, how to design a heavy component separation system optimization method capable of ensuring stable product quality of the heavy component separation system is a problem to be solved urgently.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an optimization control method and system for a heavy component separation system in chemical production, which can carry out comprehensive optimization control on the heavy component separation system on the whole, help chemical enterprises to realize full-automatic stable operation of the heavy component separation system in the production process, greatly improve the production efficiency and the operation stability, improve the precision of heavy component emission control, and reduce the energy consumption and the material consumption.
In order to solve the technical problems, the invention provides the following technical scheme:
in one aspect, the invention provides an optimization control method for a heavy component separation system in chemical production, which comprises the following steps:
optimally controlling the flow of the heat exchanger of the component separation system according to the input value of the automatic temperature difference controller and the measured value of the flow of the heat medium outlet of the heat exchanger;
optimally controlling the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow;
according to preset reflux quantity parameters of the heavy component separation system and a measured reflux quantity value of the heavy component separation system, optimally controlling the reflux quantity of the heavy component separation system;
and optimally controlling the feeding amount of the heavy component separation system according to the measured value of the reflux amount and the upstream disturbance amount in the heavy component separation system.
Further, according to the input value of the automatic temperature difference controller and the measured value of the flow of the heat medium outlet of the heat exchanger, the flow of the heat exchanger of the component separation system is optimally controlled, and the method comprises the following steps:
acquiring an input value of the automatic temperature difference controller;
determining the input value of a flow controller according to the input value of the automatic temperature difference controller;
acquiring an input value of a heat exchanger flow adjusting mechanism based on a closed-loop feedback control algorithm according to the input value of the flow controller and a measured value of the flow of a heating medium outlet of the heat exchanger, wherein the heat exchanger flow adjusting mechanism is arranged on the heat exchanger connected with the heavy component separation tower body;
and carrying out real-time optimal control on the flow of the heat exchanger of the heavy component separation system according to the input value of the flow adjusting mechanism of the heat exchanger.
Further, the obtaining of the input value of the automatic temperature difference controller comprises;
determining a preset liquid level parameter of a heavy component separation system;
measuring to obtain a liquid level measured value of the heavy component separation system;
and acquiring the input value of the automatic temperature difference controller based on a closed-loop feedback control algorithm according to the preset liquid level parameter of the heavy component separation system and the liquid level measured value of the heavy component separation system.
Further, the determining of the input value of the flow controller according to the input value of the automatic temperature difference controller comprises;
measuring to obtain a measured value of the temperature of a heat medium outlet and a measured value of the temperature of a heat medium inlet of a heat exchanger in the heavy component separation system;
and acquiring the input value of the flow controller based on a closed-loop feedback control algorithm according to the input value of the automatic temperature difference controller, the measured value of the heat medium outlet temperature and the measured value of the heat medium inlet temperature.
Further, the optimal control of the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow comprises:
obtaining an input value of the automatic controller of the flow of the heavy components;
measuring to obtain the recombination flow measurement value;
acquiring an input value of a heavy component discharge flow regulating mechanism based on a closed-loop feedback control algorithm according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow, wherein the heavy component discharge flow regulating mechanism is connected with a liquid cavity in the heavy component separation tower body;
and carrying out real-time optimization control on the tower kettle temperature of the heavy component separation system according to the input value of the heavy component discharge flow regulating mechanism.
Further, the obtaining of the input value of the automatic controller for the flow of the heavy components includes:
acquiring a preset tower kettle temperature parameter of the heavy component separation system, and measuring to obtain a tower kettle temperature measured value of the heavy component separation system;
and acquiring the input value of the heavy component flow automatic controller based on a closed-loop feedback control algorithm according to the tower kettle temperature parameter and the tower kettle temperature measured value.
Further, the method for optimally controlling the reflux quantity of the heavy component separation system according to the reflux quantity parameter and the reflux quantity measured value of the heavy component separation system obtained by measurement of the preset reflux quantity parameter of the heavy component separation system comprises the following steps:
obtaining a preset reflux quantity parameter of the heavy component separation system;
measuring to obtain a measured value of the reflux quantity of the heavy component separation system;
acquiring an input value of a reflux quantity adjusting and executing mechanism based on a closed-loop feedback control algorithm according to the reflux quantity parameter and the reflux quantity measured value, wherein the reflux quantity adjusting and executing mechanism is arranged between a reflux tank and a heavy component separation tower body in the heavy component separation system;
and adjusting the input value of an actuating mechanism according to the reflux quantity, and carrying out real-time optimization control on the reflux quantity of the heavy component separation system.
Further, the optimally controlling the feeding amount of the heavy component separation system according to the measured value of the reflux amount and the upstream disturbance amount in the heavy component separation system comprises:
measuring to obtain a measured value of the feeding amount of the heavy component separation system;
acquiring an input value of a feedforward controller based on a closed-loop feedback control algorithm according to the measured value of the reflux quantity and the measured value of the feeding quantity;
obtaining an input value of a feeding actuating mechanism according to the input value of the feedforward controller and the upstream disturbance quantity, wherein the feeding actuating mechanism is arranged at a feeding port at the top of the heavy component separation tower body;
and carrying out real-time optimization control on the feeding flow of the heavy component separation system according to the input value of the feeding actuating mechanism.
Further, the obtaining an input value of the feeding actuator according to the input value of the feedforward controller and the upstream disturbance amount includes:
calculating to obtain an input value CV of the feeding actuating mechanism according to a formula I8：
CV8＝K1*FF+K2*CV7Formula one
In formula one, K1Is an anti-interference coefficient; k2Is a fine tuning coefficient; FF is the upstream disturbance quantity; CV of7Inputting a value for the feedforward controller.
On the other hand, the invention also provides an optimization control system for the heavy component separation system in chemical production, which comprises the following components:
the heat exchanger flow optimizing control module is used for optimally controlling the flow of the heat exchanger of the component separation system according to the input value of the temperature difference automatic controller and the measured value of the flow of the heat medium outlet of the heat exchanger;
the heavy component discharge flow optimizing control module is used for optimally controlling the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow;
the reflux optimization control module is used for carrying out optimization control on the reflux of the heavy component separation system according to a preset reflux parameter of the heavy component separation system and a reflux measured value of the heavy component separation system obtained by measurement;
and the feeding quantity optimization control module is used for performing optimization control on the feeding quantity of the heavy component separation system according to the measured value of the reflux quantity and the upstream disturbance quantity in the heavy component separation system.
According to the technical scheme, the optimization control method and the optimization control system for the heavy component separation system in the chemical production are disclosed, wherein the method comprises the following steps: optimally controlling the flow of the heat exchanger of the component separation system according to the input value of the automatic temperature difference controller and the measured value of the flow of the heat medium outlet of the heat exchanger; optimally controlling the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow; and optimally controlling the reflux quantity of the heavy component separation system according to the preset reflux quantity parameter and the reflux quantity measured value of the heavy component separation system, and optimally controlling the feed quantity of the heavy component separation system according to the reflux quantity measured value and the upstream disturbance quantity in the heavy component separation system. The invention can carry out comprehensive full-automatic stable optimization control on the heavy component separation system on the whole, can help chemical enterprises to realize full-automatic stable operation of the heavy component separation system in the production process, greatly improves the production efficiency and the operation stability, improves the precision of heavy component emission control, and reduces the energy consumption and the material consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a conventional control method of a heavy component separation system for chemical production in the prior art.
Fig. 2 is a schematic flow chart of an optimization control method for a heavy component separation system in chemical production according to the invention.
Fig. 3 is a flow chart illustrating step 100 of the optimization control method according to the present invention.
Fig. 4 is a schematic flow chart of step 101 in the optimization control method of the present invention.
Fig. 5 is a flow chart illustrating step 102 of the optimization control method according to the present invention.
Fig. 6 is a flow chart illustrating step 200 of the optimization control method according to the present invention.
Fig. 7 is a schematic flow chart of step 201 in the optimization control method of the present invention.
Fig. 8 is a flow chart illustrating step 300 of the optimization control method according to the present invention.
FIG. 9 is a flow chart illustrating step 400 of the optimization control method of the present invention.
Fig. 10 is a schematic flow chart showing an application example of the optimization control method for the heavy component separation system in chemical production according to the present invention.
Fig. 11 is an exemplary schematic diagram of the optimization control method of the present invention as applied to a heavy component separation system.
Fig. 12 is a schematic structural diagram of an optimization control system for a heavy component separation system in chemical production according to the invention.
Fig. 13 is a schematic structural diagram of an apparatus for optimizing control of a heavy component separation system in chemical production according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment one of the present invention discloses a specific implementation manner of an optimization control method for a heavy component separation system in chemical production, and referring to fig. 2, the optimization control method specifically includes the following contents:
step 100: and optimally controlling the flow of the heat exchanger of the component separation system according to the input value of the automatic temperature difference controller and the measured value of the flow of the heat medium outlet of the heat exchanger.
In the step, the heavy component separation system used in the chemical production comprises a heavy component separation tower body, a heavy component discharge flow executing mechanism which is connected with a liquid cavity in the heavy component separation tower body and is used for controlling the liquid discharge of the liquid cavity, a feeding executing mechanism which is arranged at a feeding port at the top of the heavy component separation tower body and is used for controlling the feeding flow of the heavy component separation tower body, a heat exchanger flow regulating mechanism which is arranged on a heat exchanger connected with the heavy component separation tower body and is used for regulating the flow of the heat exchanger, and a reflux quantity regulating executing mechanism which is arranged between a reflux tank in the heavy component separation system and the heavy component separation tower body; wherein the reflux tank and the discharge port at the top of the tower are sequentially connected and arranged at the same side of the top of the heavy component separation tower body; that is to say, the total number of the mechanisms to be adjusted is four, namely a heavy component discharge flow executing mechanism, a feeding executing mechanism, a heat exchanger flow adjusting mechanism and a reflux adjusting executing mechanism; since the adjustment of the return flow adjusting actuator needs to pass through the intermediate value in the process of adjusting the output value of the heavy component discharge flow actuator, and the adjustment of the feed flow actuator needs to be based on the result of the optimal control of the return flow adjusting actuator, the flow of the heat exchanger and the discharge flow of the heavy component are optimally controlled, namely, the current step 100 and the subsequent step 200, then the return flow of the heavy component separation system is optimally controlled, namely, the subsequent step 300, and then the feed flow of the heavy component separation system is optimally controlled, and the subsequent step 400.
Step 200: and optimally controlling the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow.
Step 300: and optimally controlling the reflux quantity of the heavy component separation system according to a preset reflux quantity parameter of the heavy component separation system and a measured reflux quantity value of the heavy component separation system obtained through measurement.
Step 400: and optimally controlling the feeding amount of the heavy component separation system according to the measured value of the reflux amount and the upstream disturbance amount in the heavy component separation system.
From the above description, the embodiment of the invention can perform comprehensive full-automatic stable optimization control on the heavy component separation system as a whole, can help chemical enterprises to realize full-automatic stable operation of the heavy component separation system in the production process, and overcomes the problem that a control loop cannot be automatically put into operation or cannot stably run for a long period after the control loop is put into operation because the actual dynamic corresponding time of the system is long after the reflux quantity is changed in a conventional control method.
The second embodiment of the present invention discloses a specific implementation manner of step 100 in the optimization control method, and referring to fig. 3, the step 100 specifically includes the following contents:
step 101: and acquiring an input value of the automatic temperature difference controller.
Step 102: and determining the input value of the flow controller according to the input value of the automatic temperature difference controller.
Step 103: and acquiring an input value of a flow regulating mechanism of the heat exchanger based on a closed-loop feedback control algorithm according to the input value of the flow controller and a measured value of the flow of a heat medium outlet of the heat exchanger.
In step 103, the heat exchanger flow regulating mechanism is arranged on a heat exchanger connected with the heavy component separation tower body.
Step 104: and carrying out real-time optimal control on the flow of the heat exchanger of the heavy component separation system according to the input value of the flow adjusting mechanism of the heat exchanger.
From the above description, it can be seen that embodiments of the present invention enable accurate and reliable optimal control of the heat exchanger flow of a component separation system.
An embodiment of the present invention discloses a specific implementation manner of step 101 in the above optimization control method, and referring to fig. 4, the step 101 specifically includes the following contents:
step 101 a: and determining a preset liquid level parameter of the heavy component separation system.
Step 101 b: and measuring to obtain a liquid level measured value of the heavy component separation system.
Step 101 c: and acquiring the input value of the automatic temperature difference controller based on a closed-loop feedback control algorithm according to the preset liquid level parameter of the heavy component separation system and the liquid level measured value of the heavy component separation system.
From the above description, it can be seen that the embodiment of the present invention realizes accurate and reliable acquisition of the input value of the automatic temperature difference controller, and provides an accurate and reliable data base for the subsequent optimized control of the flow rate of the heat exchanger.
The fourth embodiment of the present invention discloses a specific implementation manner of step 102 in the optimization control method, and referring to fig. 5, the step 102 specifically includes the following contents:
step 102 a: and measuring to obtain a measured value of the temperature of a heat medium outlet and a measured value of the temperature of a heat medium inlet of the heat exchanger in the heavy component separation system.
Step 102 b: and acquiring the input value of the flow controller based on a closed-loop feedback control algorithm according to the input value of the automatic temperature difference controller, the measured value of the heat medium outlet temperature and the measured value of the heat medium inlet temperature.
From the above description, the embodiment of the present invention provides a specific implementation manner for determining the input value of the flow controller according to the input value of the automatic temperature difference controller, so as to ensure the accuracy of the subsequent optimal control on the flow of the heat exchanger.
An embodiment five of the present invention discloses a specific implementation manner of step 200 in the above optimization control method, and referring to fig. 6, the step 200 specifically includes the following contents:
step 201: and acquiring an input value of the automatic controller of the flow of the heavy components.
Step 202: and measuring to obtain the recombination flow measured value.
Step 203: and acquiring an input value of the heavy component discharge flow regulating mechanism based on a closed-loop feedback control algorithm according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow.
In step 203, the heavy component discharge flow regulating mechanism is arranged in connection with a liquid chamber in the heavy component separation column.
Step 204: and carrying out real-time optimization control on the tower kettle temperature of the heavy component separation system according to the input value of the heavy component discharge flow regulating mechanism.
From the above description, it can be seen that the embodiments of the present invention can perform accurate and efficient optimal control on the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow.
Sixth embodiment of the present invention discloses a specific implementation manner of step 201 in the above optimization control method, and referring to fig. 7, the step 201 specifically includes the following contents:
step 201 a: and acquiring a preset tower kettle temperature parameter of the heavy component separation system, and measuring to obtain a tower kettle temperature measured value of the heavy component separation system.
Step 201 b: and acquiring the input value of the heavy component flow automatic controller based on a closed-loop feedback control algorithm according to the tower kettle temperature parameter and the tower kettle temperature measured value.
From the above description, the embodiment of the present invention realizes accurate and reliable acquisition of the input value of the automatic controller for the flow of the heavy components, and provides an accurate and reliable data base for the subsequent optimal control of the temperature of the tower bottom of the heavy component separation system.
The seventh embodiment of the present invention discloses a specific implementation manner of step 300 in the optimization control method, and referring to fig. 8, the step 300 specifically includes the following contents:
step 301: and obtaining a preset reflux quantity parameter of the heavy component separation system.
Step 302: and measuring to obtain a measured value of the reflux quantity of the heavy component separation system.
Step 303: and acquiring an input value of a reflux quantity adjusting actuating mechanism based on a closed-loop feedback control algorithm according to the reflux quantity parameter and the reflux quantity measured value.
In step 303, the reflux quantity adjusting actuator is disposed between a reflux tank and a heavy component separation tower in the heavy component separation system.
Step 304: and adjusting the input value of an actuating mechanism according to the reflux quantity, and carrying out real-time optimization control on the reflux quantity of the heavy component separation system.
As can be seen from the above description, embodiments of the present invention enable accurate and reliable regulation control of the amount of reflux to the component separation system.
An eighth embodiment of the present invention discloses a specific implementation manner of step 400 in the foregoing optimization control method, and referring to fig. 9, the step 400 specifically includes the following contents:
step 401: and measuring to obtain a measured value of the feeding amount of the heavy component separation system.
Step 402: and acquiring an input value of a feedforward controller based on a closed-loop feedback control algorithm according to the measured value of the reflux quantity and the measured value of the feeding quantity.
Step 403: and obtaining an input value of the feeding actuating mechanism according to the input value of the feedforward controller and the upstream disturbance quantity.
In step 403, the feeding actuator is disposed at the feeding port of the top of the heavy component separation tower, and an input value CV of the feeding actuator is calculated according to a formula one8：
CV8＝K1*FF+K2*CV7Formula one
In formula one, K1Is an anti-interference coefficient; k2Is a fine tuning coefficient; FF is the upstream disturbance quantity; CV of7Inputting a value for the feedforward controller.
Step 404: and carrying out real-time optimization control on the feeding flow of the heavy component separation system according to the input value of the feeding actuating mechanism.
From the above description, it can be seen that embodiments of the present invention enable accurate and reliable regulation control of the feed rate to a component separation system.
For further explaining the scheme, the present invention further provides an application example of an optimization control method for a heavy component separation system in chemical production, and referring to fig. 10, the optimization control method specifically includes:
1-1, a system liquid level setting step for controlling heat medium flow of a heat exchanger, wherein a heavy component separation system liquid level SV is set according to process requirements1。
1-2, a system liquid level measurement step for controlling heat medium flow of a heat exchanger, and a step of measuring the actual liquid level value PV of a heavy component separation system1。
1-3, a system liquid level automatic control step for controlling the flow of the heat medium of the heat exchanger, wherein the system liquid level SV is separated according to the set heavy component1And the measured actual level value PV1Calculating to obtain CV through a closed loop feedback control algorithm1As the input of the automatic temperature difference controller.
1-4, heat medium flow control exchanger for heat exchangerA step of measuring the temperature PV of the heat medium inlet and outlet of the heat exchanger of the heavy component separation system2And PV3。
1-5, a temperature difference automatic control step for controlling the flow of the heat medium of the heat exchanger according to the input CV1And the measured actual inlet-outlet temperature PV2And PV3Calculating to obtain CV through a closed loop feedback control algorithm2As a flow controller input.
1-6, a heat exchanger heat medium outlet flow measurement step for heat exchanger heat medium flow control, namely measuring the actual flow value PV of the heat exchanger heat medium outlet of the heavy component separation system4。
1-7, a heat exchanger heat medium outlet flow automatic control step for heat exchanger heat medium flow control, according to input CV2And the measured actual flow value PV of the heat medium outlet of the heat exchanger4Calculating to obtain CV through a closed loop feedback control algorithm3As input to the flow actuator 1.
1-8, a heat exchanger heat medium flow regulation execution step for heat exchanger heat medium flow control, wherein the heat exchanger flow F is controlled1The regulating valve of (1), i.e. the actuator (1), making its opening degree and input CV3And (6) matching.
2-1, a system tower kettle temperature setting step for controlling the tower kettle temperature, wherein the tower kettle temperature SV of the heavy component separation system is set according to the process requirements2。
2-2, a system tower kettle temperature measuring step for controlling the tower kettle temperature, namely measuring the actual tower kettle temperature PV of the heavy component separation system6。
2-3, automatically controlling the temperature of the tower kettle of the system for controlling the temperature of the tower kettle, and separating the system tower kettle temperature SV according to the set heavy components2And the measured actual tower kettle temperature PV6Calculating to obtain CV through a closed loop feedback control algorithm4As input to the heavies flow auto controller.
2-4, measuring the flow of the heavy component for controlling the temperature of the tower kettle, and measuring the actual flow PV of the heavy component separation system5。
2-5, useThe recombination flow division automatic control step of tower kettle temperature control is carried out according to input CV4And the measured actual flow value PV of the heat medium outlet of the heat exchanger5Calculating to obtain CV through a closed loop feedback control algorithm5As input to the flow actuator 2.
2-6, a heavy component flow adjusting and executing step for controlling the temperature of the tower kettle, and controlling the discharge flow F of the heavy component2The regulating valve, i.e. the actuator 2, is opened to the input CV5And (6) matching.
3-1, a reflux quantity setting step for controlling the reflux quantity of the system, wherein the reflux quantity SV of the heavy component separation system is set according to the process requirement3。
3-2, measuring the actual reflux quantity PV of the heavy component separation system in the step of measuring the reflux quantity of the system7。
3-3, automatic control step for system reflux quantity, according to input SV3And the measured actual amount of reflux PV7Calculating to obtain CV through a closed loop feedback control algorithm9As input to the flow actuator 3.
3-4, adjusting and executing step for system reflux quantity, controlling the adjusting valve of the reflux quantity F3, namely an executing mechanism 3, and enabling the opening degree and the input CV9And (6) matching.
4-1, a feed quantity measuring step for controlling the system feed quantity, namely measuring the actual feed quantity PV of the heavy component separation system8。
4-2, automatic control step for system feed rate, according to input PV7And the measured actual feed PV8Calculating to obtain CV through a closed loop feedback control algorithm7As a feed forward controller input.
4-3 for a system feedforward control step, input CV by a feedforward controller7And FF to obtain CV8As input for the feed quantity actuator 4.
4-4, adjusting and executing step for system feeding amount, and controlling the feeding amount F4The regulating valve of (4), i.e. the actuator (4), making its opening degree and input CV8And (6) matching.
5. And an operation result display step for dynamically displaying the set value, the actual measured value and the opening degree of the actuating mechanism of the heavy component separation system in real time.
All the steps can be completed in a Distributed Control System (DCS). After set values of the liquid level of the heavy component separation system, the temperature of a tower kettle and the reflux quantity are input according to the actual production process requirements of chemical enterprises, when the fluctuation of the feeding quantity or the upstream production unit of the system is automatically detected, the most key step is to change the feeding quantity and the reflux quantity of the system by a feedforward feedback control algorithm, the upstream disturbance is used as a feedforward to change the feeding quantity so that the system can respond to the disturbance quantity in advance, and the reflux quantity is used for further finely adjusting the feeding quantity to an optimal set value after the system overcomes the main disturbance; meanwhile, the flow of the heating medium is changed through a feedback control algorithm based on the liquid level measurement result, so that the liquid level is stabilized at a set value; meanwhile, when the temperature of the tower kettle reaches a set value, the heavy component completes automatic optimal discharging control. In conclusion, the establishment of the dynamic balance of the whole heavy component separation system is finally completed.
From the above description, the method of the present invention can perform comprehensive full-automatic stable optimization control on the heavy component separation system as a whole, and can overcome the difficulty that the control loop cannot be automatically put into operation or cannot stably operate for a long period after being automatically put into operation due to the long actual dynamic corresponding time of the system after the reflux quantity is changed in the conventional control method, thereby greatly improving the production efficiency and the operation stability; meanwhile, by using the device or the method, even if the upstream suddenly fluctuates, the heavy component separation effect is not influenced, the precision of heavy component emission control is improved, and the energy consumption and the material consumption are reduced.
In one specific example, referring to FIG. 11, system heat medium flow F1The control method comprises the following steps: setting the liquid level SV of the heavy component separation system according to the process requirements1(ii) a Measuring the actual level value PV of the heavies separation system1(ii) a According to the set liquid level SV of the heavy component separation system1And the measured actual level value PV1Calculating to obtain CV through a closed loop feedback control algorithm1As the input of the automatic temperature difference controller; measuring heavy component separation system heat exchanger heat medium inlet and outlet temperature PV2And PV3(ii) a According to input CV1And the measured actual inlet-outlet temperature PV2And PV3Calculating to obtain CV through a closed loop feedback control algorithm2As a flow controller input; measuring actual flow value PV of heat medium outlet of heat exchanger of heavy component separation system4(ii) a According to input CV2And the measured actual flow value PV of the heat medium outlet of the heat exchanger4Calculating to obtain CV through a closed loop feedback control algorithm3As the flow actuator 1 input; controlling the heat exchanger flow F1The regulating valve of (1), i.e. the actuator (1), making its opening degree and input CV3And (6) matching. The temperature control method of the tower kettle of the system comprises the following steps: setting the temperature SV of a tower kettle of a heavy component separation system according to process requirements2(ii) a Measuring actual tower kettle temperature PV of heavy component separation system6(ii) a According to the set temperature SV of the tower kettle of the heavy component separation system2And the measured actual tower kettle temperature PV6Calculating to obtain CV through a closed loop feedback control algorithm4As the input of the automatic controller of the flow of the heavy components; measuring actual flow PV of heavy component in heavy component separation system5(ii) a According to input CV4And the measured actual flow value PV of the heat medium outlet of the heat exchanger5Calculating to obtain CV through a closed loop feedback control algorithm5As the flow actuator 2 input; controlling the heavy ends discharge flow F2The regulating valve, i.e. the actuator 2, is opened to the input CV5And (6) matching. The system reflux quantity control method comprises the following steps: setting the reflux quantity SV of the heavy component separation system according to the process requirements3(ii) a Measuring the actual reflux PV of the heavies separation system7(ii) a According to input SV3And the measured actual amount of reflux PV7Calculating to obtain CV through a closed loop feedback control algorithm9As the flow actuator 3 input; controlling the reflux amount F3The regulating valve of (3), i.e. the actuator (3), making its opening degree and input CV9And (6) matching. The system feed flow control method comprises the following steps: measuring the actual feed quantity PV of a heavy ends separation system8(ii) a According to input PV7And the measured actual feed PV8Calculating to obtain CV through a closed loop feedback control algorithm7As a feed forward controller input;input CV from a feedforward controller7And FF to obtain CV8As input to the feed rate actuator 4, CV8＝K1*FF+K2*CV7Wherein, K is1To interference rejection factor, K2Is a fine tuning coefficient; controlling the feed rate F4The regulating valve of (4), i.e. the actuator (4), making its opening degree and input CV8And (6) matching. And dynamically displaying the set value, the actual measured value and the opening of the actuating mechanism of the heavy component separation system in real time.
The ninth embodiment of the present invention discloses a specific implementation manner of an optimization control system for a heavy component separation system in chemical production, which can implement all the steps in the optimization control method, and referring to fig. 12, the optimization control system specifically includes the following contents:
and the heat exchanger flow optimization control module 10 is used for performing optimization control on the flow of the heat exchanger of the component separation system according to the input value of the temperature difference automatic controller and the measured value of the flow of the heat medium outlet of the heat exchanger.
And the heavy component discharge flow optimizing control module 20 is used for optimally controlling the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow.
And the reflux optimization control module 30 is configured to optimally control the reflux of the heavy component separation system according to a preset reflux parameter of the heavy component separation system and a measured reflux value of the heavy component separation system obtained through measurement.
And the feeding quantity optimizing control module 40 is used for optimally controlling the feeding quantity of the heavy component separation system according to the measured value of the reflux quantity and the upstream disturbance quantity in the heavy component separation system.
From the above description, the embodiment of the invention can help chemical enterprises to realize the full-automatic stable operation of the heavy component separation system in the production process, overcomes the problem that the conventional control method cannot be put into automation in a control loop or cannot be stably operated for a long period after the control loop is put into automation because the actual dynamic corresponding time of the system is long after the reflux quantity is changed, and greatly improves the production efficiency and the operation stability; meanwhile, when the upstream suddenly fluctuates, the separation effect of the heavy components is not influenced, the precision of the heavy component discharge control is improved, and the energy consumption and the material consumption are reduced.
To further illustrate the present invention, the present invention further provides an apparatus for optimizing and controlling a heavy component separation system in chemical production, referring to fig. 13, where the apparatus specifically includes:
heavy fraction separation system measuring module comprising means for measuring the liquid level (PV) of the heavy fraction separation system1) Temperature of heat medium inlet/outlet (PV) of heat exchanger2And PV3) Heat exchanger heat medium outlet flow (PV)4) Recombination split flow (PV)5) Column bottom temperature (PV)6) Amount of reflux (PV)7) And feed amount (PV)8)；
A heavy fraction separation system setting module comprising means for setting a liquid level (SV) of the heavy fraction separation system1) Column bottom temperature (SV)2) Amount of reflux (SV)3) And amount of feed (SV)4)；
The heavy component separation system control module is used for calculating to obtain a controller output value through a closed-loop feedback control algorithm according to a set value obtained by the heavy component separation system setting module and a measured value obtained by the measuring module;
the heavy component separation system execution module is used for controlling the execution mechanism to enable the opening degree of the execution mechanism to be consistent with the output value of the controller;
and the heavy component separation system display module is used for dynamically displaying the set value, the actual measured value and the real-time opening data of the actuating mechanism of the heavy component separation system.
Further, the measuring module outputs the measuring node to the feedback control algorithm module for establishing a new dynamic balance.
Furthermore, the feedback control algorithm module adjusts the proportional, integral and differential related parameters in the feedback control algorithm to make the measured value reach the set value and establish dynamic balance.
Furthermore, the execution module converts the calculation result of the feedback control algorithm module into an electric signal received by the field regulating valve, and the field regulating valve receives the electric signal and then gives a corresponding valve opening so as to ensure that a set value meeting the process requirement is met.
The heavy component separation system comprises a measuring module, a setting module, a control module, an execution module and an operation result display module, wherein the measuring module, the setting module, the control module, the execution module and the operation result display module all realize related functions based on a distributed control system.
An optimized control method and device for a heavy component separation system in chemical production are characterized in that after a chemical enterprise is actually put into operation, all parameters of a tower run stably.
The invention can realize real-time acquisition of the measured value of the heavy component separation system in the DCS, thereby realizing system liquid level control, tower kettle temperature control, reflux quantity control and feeding quantity control based on a feedback control algorithm in the DCS, and the embodiment can realize the rapid dynamic stability of the system under the condition of fluctuation of an upstream production unit without any manual intervention in the process. Furthermore, real-time tracking display of the set value, the actual measured value and the change trend of the opening degree value of the actuating mechanism can be realized in the DCS.
Those of skill would further appreciate that the various illustrative logical blocks, units, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, units, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as software or hardware depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An optimization control method for a heavy component separation system in chemical production is characterized by comprising the following steps:
optimally controlling the flow of the heat exchanger of the component separation system according to the input value of the automatic temperature difference controller and the measured value of the flow of the heat medium outlet of the heat exchanger;
optimally controlling the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow;
according to preset reflux quantity parameters of the heavy component separation system and a measured reflux quantity value of the heavy component separation system, optimally controlling the reflux quantity of the heavy component separation system;
and optimally controlling the feeding amount of the heavy component separation system according to the measured value of the reflux amount and the upstream disturbance amount in the heavy component separation system;
wherein, according to the automatic controller input value of difference in temperature and the heat medium outlet flow measurement value of heat exchanger, carry out optimal control to the heat exchanger flow of component separation system, include:
acquiring an input value of the automatic temperature difference controller;
determining the input value of a flow controller according to the input value of the automatic temperature difference controller;
acquiring an input value of a heat exchanger flow adjusting mechanism based on a closed-loop feedback control algorithm according to the input value of the flow controller and a measured value of the flow of a heating medium outlet of the heat exchanger, wherein the heat exchanger flow adjusting mechanism is arranged on the heat exchanger connected with the heavy component separation tower body;
and carrying out real-time optimal control on the flow of the heat exchanger of the heavy component separation system according to the input value of the flow adjusting mechanism of the heat exchanger.
2. The method of claim 1, wherein the obtaining the delta temperature automatic controller input values comprises;
determining a preset liquid level parameter of a heavy component separation system;
measuring to obtain a liquid level measured value of the heavy component separation system;
and acquiring the input value of the automatic temperature difference controller based on a closed-loop feedback control algorithm according to the preset liquid level parameter of the heavy component separation system and the liquid level measured value of the heavy component separation system.
3. The method of claim 1, wherein said determining a flow controller input value from said delta temperature automatic controller input value comprises;
measuring to obtain a measured value of the temperature of a heat medium outlet and a measured value of the temperature of a heat medium inlet of a heat exchanger in the heavy component separation system;
and acquiring the input value of the flow controller based on a closed-loop feedback control algorithm according to the input value of the automatic temperature difference controller, the measured value of the heat medium outlet temperature and the measured value of the heat medium inlet temperature.
4. The method of claim 1, wherein said optimally controlling the heavies discharge flow of the heavies separation system based on the heavies flow automatic controller input and the heavies flow measurement comprises:
obtaining an input value of the automatic controller of the flow of the heavy components;
measuring to obtain the recombination flow measurement value;
acquiring an input value of a heavy component discharge flow regulating mechanism based on a closed-loop feedback control algorithm according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow, wherein the heavy component discharge flow regulating mechanism is connected with a liquid cavity in the heavy component separation tower body;
and carrying out real-time optimization control on the tower kettle temperature of the heavy component separation system according to the input value of the heavy component discharge flow regulating mechanism.
5. The method of claim 4, wherein obtaining the heavy ends flow auto controller input value comprises:
acquiring a preset tower kettle temperature parameter of the heavy component separation system, and measuring to obtain a tower kettle temperature measured value of the heavy component separation system;
and acquiring the input value of the heavy component flow automatic controller based on a closed-loop feedback control algorithm according to the tower kettle temperature parameter and the tower kettle temperature measured value.
6. The method of claim 1, wherein the optimal control of the reflux amount of the heavy component separation system based on the measured reflux amount of the heavy component separation system obtained by the preset reflux amount parameters and measurement of the heavy component separation system comprises:
obtaining a preset reflux quantity parameter of the heavy component separation system;
measuring to obtain a measured value of the reflux quantity of the heavy component separation system;
acquiring an input value of a reflux quantity adjusting and executing mechanism based on a closed-loop feedback control algorithm according to the reflux quantity parameter and the reflux quantity measured value, wherein the reflux quantity adjusting and executing mechanism is arranged between a reflux tank and a heavy component separation tower body in the heavy component separation system;
and adjusting the input value of an actuating mechanism according to the reflux quantity, and carrying out real-time optimization control on the reflux quantity of the heavy component separation system.
7. The method of claim 1, wherein the optimally controlling the feed rate to the heavies separation system based on the measured reflux rate and an upstream disturbance in the heavies separation system comprises:
measuring to obtain a measured value of the feeding amount of the heavy component separation system;
acquiring an input value of a feedforward controller based on a closed-loop feedback control algorithm according to the measured value of the reflux quantity and the measured value of the feeding quantity;
obtaining an input value of a feeding actuating mechanism according to the input value of the feedforward controller and the upstream disturbance quantity, wherein the feeding actuating mechanism is arranged at a feeding port at the top of the heavy component separation tower body;
and carrying out real-time optimization control on the feeding flow of the heavy component separation system according to the input value of the feeding actuating mechanism.
8. The method of claim 7, wherein deriving the input to the feed actuator based on the feedforward controller input and the upstream disturbance variable comprises:
calculating to obtain an input value CV of the feeding actuating mechanism according to a formula I8：
CV8＝K1*FF+K2*CV7Formula one
In formula one, K1Is an anti-interference coefficient; k2Is a fine tuning coefficient; FF is the upstream disturbance quantity; CV of7Inputting a value for the feedforward controller.
9. An optimal control system for a heavy component separation system in chemical production is characterized by comprising:
the heat exchanger flow optimizing control module is used for optimally controlling the flow of the heat exchanger of the component separation system according to the input value of the temperature difference automatic controller and the measured value of the flow of the heat medium outlet of the heat exchanger;
the heavy component discharge flow optimizing control module is used for optimally controlling the heavy component discharge flow of the heavy component separation system according to the input value of the heavy component flow automatic controller and the measured value of the heavy component flow;
the reflux optimization control module is used for carrying out optimization control on the reflux of the heavy component separation system according to a preset reflux parameter of the heavy component separation system and a reflux measured value of the heavy component separation system obtained by measurement;
and the feeding quantity optimization control module is used for performing optimization control on the feeding quantity of the heavy component separation system according to the measured value of the reflux quantity and the upstream disturbance quantity in the heavy component separation system.
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