CN112556483A - Dividing wall type heat exchanger temperature self-adaptive tracking control system with fault tolerance function - Google Patents
Dividing wall type heat exchanger temperature self-adaptive tracking control system with fault tolerance function Download PDFInfo
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- CN112556483A CN112556483A CN202011276777.2A CN202011276777A CN112556483A CN 112556483 A CN112556483 A CN 112556483A CN 202011276777 A CN202011276777 A CN 202011276777A CN 112556483 A CN112556483 A CN 112556483A
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- 239000012530 fluid Substances 0.000 claims description 21
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- 230000000903 blocking effect Effects 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
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- Automation & Control Theory (AREA)
- Control Of Temperature (AREA)
- Feedback Control In General (AREA)
Abstract
A dividing wall type heat exchanger temperature self-adaptive tracking control system with a fault tolerance function relates to a heat exchanger control system, and can set error precision according to a designed temperature tracking error performance setting unit, so that the temperature tracking error is effectively reduced; the designed universal actuator fault identification model can effectively estimate actuator jamming and failure faults which inevitably exist in the system, and eliminates the influence of the faults on the control precision and the safety stability of the system; by combining the designed adaptive controller and the parameter updating rule thereof, the adaptive tracking control system for the outlet temperature of the wall type heat exchanger has high tracking precision and good fault tolerance, can effectively improve the working efficiency of the heat exchanger, save energy, reduce consumption, ensure the continuous and stable operation of the system, and greatly improve the economic benefit and social benefit of enterprises.
Description
Technical Field
The invention relates to a heat exchanger tracking control system, in particular to a dividing wall type heat exchanger temperature self-adaptive tracking control system with a fault tolerance function.
Background
The heat exchanger belongs to key basic equipment in the industries of chemical industry, petrifaction, food, pharmacy and the like, and is a container for exchanging heat among different fluid media. The dividing wall type heat exchanger controls parameters such as flow rate, temperature and the like of hot fluid by controlling actuators such as a valve and the like, so that the purpose of controlling the temperature of the heated fluid is achieved. However, the heat exchanger has high nonlinearity and time lag, and the model is complex and difficult to accurately obtain. And the industrial environment is generally worse, and the temperature control of the heat exchanger is more difficult due to the influence of the heat exchanger scaling. Therefore, good heat exchanger control becomes a necessary demand in industrial production. In addition, faults such as failure and blocking can also occur when the valve actuator and the like run for a long time, so that the normal operation of the device can be influenced, and even immeasurable loss can be brought to the life and property safety of people seriously. Therefore, the practical significance of designing the heat exchanger temperature self-adaptive tracking control system with the actuator fault tolerance function is very great.
Disclosure of Invention
The invention aims to provide a dividing wall type heat exchanger temperature self-adaptive tracking control system with a fault tolerance function, and the invention provides a dividing wall type heat exchanger outlet temperature self-adaptive tracking control system with an actuator fault tolerance and temperature tracking performance setting function. The system can adjust the action of the self-adaptive controller of the system when a fault occurs by introducing an actuator general fault identification model so as to ensure that the residual normal actuators can still complete the required control target and achieve the purpose of fault tolerance.
The purpose of the invention is realized by the following technical scheme:
the system comprises an error performance setting unit, a self-adaptive controller, an actuator, a heat exchanger and a temperature detection unit;
the system operation steps are as follows:
(1) designing a temperature error performance index according to the actual process condition to enable the precision range to reach within 1%;
(2) designing a fault identification model of the universal actuator, wherein the fault identification model comprises two conditions of jamming and failure;
(3) designing an adaptive controller by adopting a reverse-thrust method;
(4) after the steps are completed, the operation process of the system is as follows: firstly, setting a preset target temperature value of an outlet of a heat exchanger, and then feeding back the actual outlet temperature of the heat exchanger detected in real time to form a closed loop so as to obtain a tracking error value of the target temperature and the actual temperature; then according to the tracking error value and the set error precision requirement, the self-adaptive controller designed in the step (3) and the actuator fault model designed in the step (2) jointly calculate the control quantity actually required to be output by the system, and the residual actuators except the fault are driven to act, so that the flow of the fluid at the inlet of the heat exchanger is controlled; the flow of the inlet fluid will finally affect the temperature of the outlet fluid of the heat exchanger, and the outlet temperature of the heat exchanger can fluctuate within 1% of the set target temperature, so as to meet the requirement of the precision range of the design in the step (1).
The invention has the advantages and effects that:
1. the system can adjust the action of a self-adaptive controller of the system when a fault occurs by introducing an actuator universal fault identification model so as to ensure that the residual normal actuators can still complete the required control target and achieve the purpose of fault tolerance; the tracking error precision is limited by designing a self-adaptive system controller and introducing a temperature tracking error performance setting link, so that the control effect is effectively improved. The temperature tracking control system of the heat exchanger has stable performance, can help to improve the heat exchange efficiency of the system, save energy, reduce consumption, reduce the accident rate of the device, improve the production efficiency and economic benefit of enterprises and increase social influence.
2. The system is composed of an adaptive controller, an actuator general fault identification model, a tracking error performance setting unit and a temperature detection unit, and is characterized in that a heat exchanger outlet fluid temperature control target value is preset, then a closed control loop is formed by detecting the heat exchanger outlet fluid temperature in real time, and the adaptive controller is designed to control the flow of the heat exchanger inlet fluid, so that the aim of tracking and controlling the heat exchanger outlet fluid temperature can be achieved.
3. According to the heat exchanger outlet temperature self-adaptive tracking control system with the valve actuator fault tolerance function, the clamping and failure faults of the actuator can be estimated by designing a general actuator fault identification model, and the system self-adaptive controller is used for adjusting control output, so that the fault tolerance purpose of the fault actuator is achieved under the condition that the temperature control is also completed.
4. The self-adaptive tracking control system for the outlet temperature of the heat exchanger with the function of setting the accuracy of the temperature tracking error of the heat exchanger, provided by the invention, has the advantages that a temperature tracking error performance setting unit is introduced into the control system, so that the system reaches the accuracy index of the temperature tracking error required in advance.
5. The invention can effectively solve the influence on the tracking control of the fluid temperature at the outlet of the heat exchanger after the valve actuator is in failure through experimental verification, obtains more accurate temperature self-adaptive tracking performance through presetting the tracking error precision, ensures that the heat exchange fluid with required temperature can be obtained, and ensures that the whole heat exchanger device keeps high-efficiency, safe and stable operation.
Drawings
Fig. 1 is a schematic structural diagram of a temperature adaptive tracking control system of a heat exchanger.
Detailed Description
The present invention will be described in detail with reference to the embodiments shown in the drawings.
The invention relates to a dividing wall type heat exchanger temperature self-adaptive tracking control system, which consists of an error performance setting unit, a self-adaptive controller, an actuator and a temperature detection unit and is characterized in that a closed-loop control loop is formed by accurately detecting the temperature of fluid at the outlet of a heat exchanger in real time, and then the self-adaptive controller capable of updating control parameters is designed, so that the flow of the fluid at the inlet of the heat exchanger is accurately controlled, and the tracking control target of controlling the temperature of the fluid at the outlet of the heat exchanger is achieved. By designing a general actuator fault identification model, the blocking and failure faults of the actuator can be estimated, the system controller is used for automatically adjusting and controlling the output, and the fault tolerance of the failed actuator is achieved under the condition of finishing temperature control as well. A tracking error performance setting unit is added in the control system, so that the system can reach the temperature tracking error accuracy index required in advance.
Example 1
As shown in fig. 1, the adaptive tracking control system for the temperature of the heat exchanger is composed of an error performance setting unit, an adaptive controller, an actuator, the heat exchanger and a temperature detection unit.
The method comprises the following specific steps:
(1) designing temperature error performance indexes according to actual process conditions, so that the precision range can reach within 1%;
(2) designing a fault identification model of the universal actuator, wherein the fault identification model comprises two conditions of jamming and failure;
(3) designing an adaptive controller by adopting a reverse-thrust method;
(4) after the steps are completed, the operation process of the system is as follows: firstly, setting a preset target temperature value of an outlet of a heat exchanger, and then feeding back the actual outlet temperature of the heat exchanger detected in real time to form a closed loop so as to obtain a tracking error value of the target temperature and the actual temperature; then according to the tracking error value and the set error precision requirement, the self-adaptive controller designed in the step 3 and the actuator fault model designed in the step 2 work out the control quantity which is actually required to be output by the system together, and the residual actuators except the fault are driven to act, so that the flow of the fluid at the inlet of the heat exchanger is controlled; the flow of the inlet fluid will finally affect the temperature of the outlet fluid of the heat exchanger, and the outlet temperature of the heat exchanger can fluctuate within 1% of the set target temperature, so as to meet the requirement of the precision range of the step 1 design.
Claims (1)
1. The dividing wall type heat exchanger temperature self-adaptive tracking control system with the fault tolerance function is characterized by comprising an error performance setting unit, a self-adaptive controller, an actuator, a heat exchanger and a temperature detection unit;
the system operation steps are as follows:
(1) designing a temperature error performance index according to the actual process condition to enable the precision range to reach within 1%;
(2) designing a fault identification model of the universal actuator, wherein the fault identification model comprises two conditions of jamming and failure;
(3) designing an adaptive controller by adopting a reverse-thrust method;
(4) after the steps are completed, the operation process of the system is as follows: firstly, setting a preset target temperature value of an outlet of a heat exchanger, and then feeding back the actual outlet temperature of the heat exchanger detected in real time to form a closed loop so as to obtain a tracking error value of the target temperature and the actual temperature; then according to the tracking error value and the set error precision requirement, the self-adaptive controller designed in the step (3) and the actuator fault model designed in the step (2) jointly calculate the control quantity actually required to be output by the system, and the residual actuators except the fault are driven to act, so that the flow of the fluid at the inlet of the heat exchanger is controlled; the flow of the inlet fluid will finally affect the temperature of the outlet fluid of the heat exchanger, and the outlet temperature of the heat exchanger can fluctuate within 1% of the set target temperature, so as to meet the requirement of the precision range of the design in the step (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011276777.2A CN112556483A (en) | 2020-11-16 | 2020-11-16 | Dividing wall type heat exchanger temperature self-adaptive tracking control system with fault tolerance function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011276777.2A CN112556483A (en) | 2020-11-16 | 2020-11-16 | Dividing wall type heat exchanger temperature self-adaptive tracking control system with fault tolerance function |
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| CN202011276777.2A Pending CN112556483A (en) | 2020-11-16 | 2020-11-16 | Dividing wall type heat exchanger temperature self-adaptive tracking control system with fault tolerance function |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5577660A (en) * | 1978-11-27 | 1980-06-11 | Honeywell Inc | Malfunctioning detection controller |
| CN203164781U (en) * | 2012-12-06 | 2013-08-28 | 石家庄化工化纤有限公司 | Medium temperature control system |
| CN104898728A (en) * | 2015-05-20 | 2015-09-09 | 西安科技大学 | CSTR temperature fault-tolerant control system based on double heat exchangers and method thereof |
-
2020
- 2020-11-16 CN CN202011276777.2A patent/CN112556483A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5577660A (en) * | 1978-11-27 | 1980-06-11 | Honeywell Inc | Malfunctioning detection controller |
| CN203164781U (en) * | 2012-12-06 | 2013-08-28 | 石家庄化工化纤有限公司 | Medium temperature control system |
| CN104898728A (en) * | 2015-05-20 | 2015-09-09 | 西安科技大学 | CSTR temperature fault-tolerant control system based on double heat exchangers and method thereof |
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