CN114459149A - Heat accumulating type wind tunnel electric preheating heater system and control method - Google Patents
Heat accumulating type wind tunnel electric preheating heater system and control method Download PDFInfo
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- CN114459149A CN114459149A CN202111629864.6A CN202111629864A CN114459149A CN 114459149 A CN114459149 A CN 114459149A CN 202111629864 A CN202111629864 A CN 202111629864A CN 114459149 A CN114459149 A CN 114459149A
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- 230000008569 process Effects 0.000 claims description 25
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- 230000001172 regenerating effect Effects 0.000 claims description 8
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
- F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1863—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2071—Arrangement or mounting of control or safety devices for air heaters using electrical energy supply
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Abstract
The invention discloses a heat accumulating type wind tunnel electric preheating heater system and a control method, wherein the heater system comprises: the heater is divided into a plurality of heating sections along the axial direction, and each heating section is provided with a plurality of heating elements; a plurality of power regulators, each power regulator is connected with one heating element and is used for regulating the output power of the heating element; the temperature detection control unit is used for detecting the temperature of each heating section in real time; the controller is connected with the power regulator and the temperature detection control unit; the upper computer is used for issuing a corresponding heating control instruction according to the heating process flow; the controller is used for: the temperature of each heating section detected by the temperature detection control unit is collected, and the temperature is fed back to the upper computer; controlling the power regulator according to a heating control instruction sent by the upper computer so as to control the temperatures of different heating sections; and feeding back the working state of the power regulator to the upper computer.
Description
Technical Field
The invention belongs to the field of heat accumulating type wind tunnel heaters, and particularly relates to a heat accumulating type wind tunnel electric preheating heater system and a control method.
Background
In a conventional hypersonic wind tunnel test, airflow expands and accelerates in the spray pipe, so that the temperature of the airflow is reduced, condensation is caused, the condensation can be avoided by increasing the temperature of the airflow in the front chamber, and a heater for increasing the total temperature of the airflow is a key component of the wind tunnel.
At present, heaters used for conventional hypersonic wind tunnels and hot jet tests comprise continuous heaters and heat storage heaters.
The continuous type usually arranges the resistance heating element into a certain shape, and through the structural design, the insulation and reasonable air circulation area of the electric heating element in the heater are ensured, after the electric heating element is electrified, the high temperature is reached in a short time, the incoming air takes away the heat through the gap, and the high-temperature air flow is obtained at the outlet of the heater; the resistance continuous electric heating has a certain limitation in its application due to its large power usage.
The heat storage type is that a heat storage material is arranged in the heater, the heater is preheated before use, heat generated by the heating element is stored in the heat storage material of the heater, the heat is transferred to incoming air by the heat storage material in a heat transfer mode in the use process, and a high-temperature air flow is obtained at the outlet of the heater. The preheating mode of the heater mainly comprises the following steps: fuel combustion, resistive element preheating. Gas components generated by fuel combustion during combustion heating can be attached to a model test piece in a carbon deposition mode, certain influence is generated on test parameters, and related tests have strict requirements on gas environment cleaning and require that the components of test gas are consistent with incoming air; preheating of the resistive element has unique advantages with respect to environmental cleaning requirements and safety.
However, the existing electric preheating heater has the following problems:
1. the heating element is controlled according to manual operation, and the health state of the heating element cannot be monitored in real time, so that the heating element cannot be replaced in time to improve the heating efficiency, and the automation degree is low;
2. the existing control method cannot independently control the temperature of the heater along the process in a segmented mode, and cannot flexibly configure a heating process according to the temperature characteristics of the heating element and the temperature rise and constant temperature processes of the heater.
Therefore, in the heater heating process, a heat accumulating type wind tunnel electric preheating heater system and a control method are needed, the automation level is improved, and the reliability test and the safe operation of the electric preheating heater system are realized.
Disclosure of Invention
The invention aims to provide a split heat accumulating type wind tunnel electric preheating heater system and a control method, which can independently control the temperature of each heating section in a mode of independent control of heater sections along the way and configuration according to needs.
In order to achieve the above object, the present invention provides a heat accumulating type wind tunnel electric preheating heater system, comprising: a heater divided axially into a plurality of heating segments, each heating segment having a plurality of heating elements;
a plurality of power regulators, each power regulator being connected to one of the heating elements for regulating the output power of the heating element;
the temperature detection control unit is used for detecting the temperature of each heating section in real time;
the controller is connected with the power regulator and the temperature detection control unit;
the upper computer is used for issuing a corresponding heating control instruction according to the heating process flow;
the controller is configured to:
collecting the temperature of each heating section detected by the temperature detection control unit, and feeding the temperature back to the upper computer;
controlling the power regulator according to a heating control instruction sent by the upper computer so as to control the temperatures of different heating sections;
and feeding back the working state of the power regulator to the upper computer.
In the alternative, the operating modes of the control system include an automatic mode and a manual mode;
in the automatic mode, the heating control instruction comprises a heating control motion sequence and a power regulator control instruction, the motion sequence comprises heating target temperature and heating time of each heating section or output power and heating time of each heating section under different time sequences, the upper computer sequentially sends each piece of information of the motion sequence to the controller according to the time sequences, and the controller controls the power regulator according to the heating control motion sequence and the power regulator control instruction;
in the manual mode, the heating control instruction comprises a power regulator control instruction, and the controller independently controls the power regulator according to the power regulator control instruction.
In the alternative, the heating element is a resistance heating element, the system comprising a health detection unit;
the health detection unit is used for detecting the electric parameters of the heating element in real time, calculating the resistance of the heating element, analyzing the change trend and the aging degree of the resistance and determining the health index of the heating element.
In an alternative scheme, the controller is further used for collecting fault signals of the temperature detection control unit, the power regulator and the heating element and sending the fault signals to the upper computer.
In an alternative scheme, the controller controls the heating section to realize heating and constant-temperature heating control based on a segmented PID control strategy.
In an alternative scheme, the controller comprises an emergency stop module, and the emergency stop module is used for sending an emergency stop instruction to the power regulator and the temperature detection control unit to forcibly stop the heating work of the heater.
In an alternative scheme, the heat accumulating type wind tunnel electric preheating heater is split, and a plurality of heating sections are detachably connected.
The invention also provides a control method of the heat accumulating type wind tunnel electric preheating heater, and by utilizing the heater system, the method comprises the following steps:
detecting the temperature of each heating section in real time through the temperature detection control unit;
issuing a corresponding heating control instruction according to the heating process flow through the upper computer;
the controller is used for collecting the temperature of each heating section detected by the temperature detection control unit and feeding the temperature back to the upper computer;
controlling the power regulator according to a heating control instruction sent by the upper computer so as to control the temperatures of different heating sections;
and feeding back the working state of the power regulator to the upper computer.
In the alternative, the operation modes of the control method comprise an automatic mode and a manual mode;
in the automatic mode, the heating control instruction comprises a heating control motion sequence and a power regulator control instruction, the motion sequence comprises heating target temperature and heating time of each heating section or output power and heating time of each heating section under different time sequences, the upper computer sequentially sends each piece of information of the motion sequence to the controller according to the time sequences, and the controller controls the power regulator according to the heating control motion sequence and the power regulator control instruction;
in the manual mode, the heating control instruction comprises a power regulator control instruction, and the controller independently controls the power regulator according to the power regulator control instruction.
In an alternative scheme, the controller controls the heating section to realize temperature rise and constant temperature control based on a segmented PID control strategy; the heating process flow comprises a plurality of heating stages, and each heating stage comprises a temperature rise period and a constant temperature period;
the PID control strategy of the temperature rise control is as follows: the integration time and the absolute error are used as parameter setting indexes, along with the change of a given value, a deviation signal of the PID changes, and a control quantity output by operation also changes; the power regulator regulates the heating power of the heating element to realize the change of the controlled variable according to the change rate of the given value, so that the temperature is raised according to the specified rate in the temperature raising process;
the PID control strategy of the constant temperature control is as follows: the integral square error is used as a parameter setting index, the given value is constant within the set time, and the controlled variable is controlled to change according to the given value, so that the constant temperature process of the heater is realized; the controlled variable is the temperature of the heater.
The invention has the beneficial effects that:
the invention adopts the mode of independent control of the heater section along the way and configuration according to the requirement, can independently control the temperature of each heating section, can improve the automation level and realize the reliability test and safe operation of the electric preheating heater system.
Furthermore, the power output of the power regulator is automatically controlled in a flow setting mode of a heating control motion sequence, so that the energy consumption and labor cost generated by heating work are reduced; the health index of the heating element is monitored in real time, the aged and damaged heating element is replaced in time, and the working efficiency of the heater is improved; by adopting a segmented PID control algorithm, the defects of uneven temperature distribution and service life damage caused by overload use of a heating element are overcome, and the efficiency and the intelligent degree of the equipment are improved.
The present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a schematic diagram of a regenerative wind tunnel electric preheat heater system according to an embodiment of the invention.
Fig. 2 is a multi-stage control flow diagram illustrating a control method of a heat accumulating type wind tunnel electric preheating heater according to an embodiment of the invention.
Fig. 3 shows a simplified schematic diagram of a control system of a regenerative wind tunnel electric preheating heater according to an embodiment of the present invention.
Detailed Description
The present invention will be described in more detail below. While the present invention provides preferred embodiments, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
An embodiment of the present invention provides a heat accumulating type wind tunnel electric preheating heater system, including:
a heater divided axially into a plurality of heating segments, each heating segment having a plurality of heating elements;
a plurality of power regulators, each power regulator being connected to one of the heating elements for regulating the output power of the heating element;
the temperature detection control unit is used for detecting the temperature of each heating section in real time;
the controller is connected with the power regulator and the temperature detection control unit;
the upper computer is used for issuing a corresponding heating control instruction according to the heating process flow;
the controller is configured to:
collecting the temperature of each heating section detected by the temperature detection control unit, and feeding the temperature back to the upper computer;
controlling the power regulator according to a heating control instruction sent by the upper computer so as to control the temperatures of different heating sections;
and feeding back the working state of the power regulator to the upper computer.
Specifically, the heater is generally cylindrical and is axially divided into a plurality of heating segments, each heating segment having a plurality of heating elements. The heater is split type in this embodiment, can dismantle the connection between a plurality of heating sections. The power of the heating elements is controlled by the power regulator, and the temperature of each heating section is controlled.
Referring to fig. 1, the system may be divided into a central control unit, a communication connection unit, an operation mode switching unit, a fault detection unit, a temperature detection control unit (including a sensor system), a health detection unit, and a database storage unit according to functional modules;
the central control unit comprises an upper computer, a controller, a local operation panel (HMI) and an emergency stop control button; the upper computer and the controller carry out data transmission through an Ethernet communication technology, and the upper computer is used for issuing a heating control instruction to the controller, uploading each signal state to the upper computer by the controller, and monitoring and displaying each signal parameter and state in real time; the controller mainly executes the sending of control instructions of the upper computer and the local HMI operation panel and the receiving of feedback signals of accessory equipment (a power adjuster and a temperature sensor in a temperature detection control unit); the emergency stop button of the emergency stop control is connected through a cable and used for manual control in an emergency state, and after the emergency stop button is triggered, an emergency stop instruction is sent to the accessory equipment through the controller, so that the heating work of the heater is forced to stop running and is protected.
The communication connection unit comprises an Ethernet communication connection between the upper computer and the controller, an Ethernet communication connection between the local HMI panel and the controller, and a bus connection between the controller and the power regulator equipment, and a communication connection state feedback signal of the communication connection unit is monitored and displayed by the upper computer in real time.
The fault detection unit displays alarm information of the sensor system fault, the power regulator fault and the heating element fault, performs sound-light alarm processing, performs graded processing on fault signals, and outputs a sensor system permission signal, a power regulator ready permission signal and a heating element ready permission signal to the central control unit.
The temperature detection control unit collects temperature sensor signals of the heater along each path, and the central control unit judges whether the sensor system has faults or not and judges the fault level according to the received temperature sensor system signals by the fault detection unit so as to determine whether to send an allowance signal to the central control unit or not; under the fault-free state, the temperature value of each section of the heater along the way is obtained by analyzing the signal of the sensor system, the closed-loop feedback control of the temperature is realized by adjusting the power output percentage of the power regulator, and the temperature control quantity of each end of the heater is reasonably optimized.
The heater system can independently control the temperature of each measuring point along the process and can be flexibly combined and configured according to the requirement.
The operation mode switching unit switches the operation state of the system into a test mode or a maintenance mode according to an externally input instruction, the test mode is divided into an automatic mode or a manual mode, when the operation mode is switched into the automatic mode, the central control unit judges whether an allowance signal is received, if the allowance signal is received, automatic process control is carried out on each section of power regulator according to the heating control motion sequence, the motion sequence state is fed back in real time, an instruction is sent to control the power regulator to start heating work, and a heating element is heated, so that different heating conditions are provided for the wind tunnel test;
when the operation mode switching unit receives an externally input instruction and is in a manual mode, the central control unit judges whether an allowance signal is received, if the allowance signal is received, parameters can be independently set for each power regulator in the manual mode, and the power regulator is controlled to perform heating work;
if the central control unit does not receive the permission signal in the two operation modes, the system enters a maintenance mode to perform system maintenance. Wherein the enabling signal is a control system ready enabling signal, a sensor system enabling signal, a heating element ready enabling signal and a power regulator ready enabling signal.
The embodiment fully considers the switching function of the maintenance and the test of the heater system, and simplifies the maintenance engineering quantity.
The health detection unit calculates the resistance of the heating element by detecting the power, voltage, current and other electrical parameters of the heating element in real time on the basis of analyzing the characteristic curve of the heating element, analyzes the change trend and aging degree of the resistance of the heating element, outputs the health index of the heating element, and timely replaces the aged heating element according to the health index of the heating element to stabilize the heating efficiency of the heater. The system of the embodiment is linked with parameters of the power regulator, so that real-time interaction of data is realized, and the health index of the heating element is monitored in real time.
The data storage unit stores the data information related to the heater and the accessory equipment thereof in a database storage mode and a data text mode, the database storage uses SQL Server to locally store the acquired data, the storage process is preprocessed and stored in the database according to a standard format, then real-time data and historical data can be conveniently called, and the high processing operation speed and the high efficiency are ensured by optimizing an access technology. The system can retain the collected information for subsequent access when the power is turned off or interrupted. The embodiment realizes the joint query of the historical data by locally storing the real-time data.
Another embodiment of the present invention further provides a method for controlling a heat storage type wind tunnel electric preheating heater, including:
detecting the temperature of each heating section in real time through the temperature detection control unit;
issuing a corresponding heating control instruction according to the heating process flow through the upper computer;
the controller is used for collecting the temperature of each heating section detected by the temperature detection control unit and feeding the temperature back to the upper computer;
controlling the power regulator according to a heating control instruction sent by the upper computer so as to control the temperatures of different heating sections;
and feeding back the working state of the power regulator to the upper computer.
In particular, the control method is based on the system described above, and the operation mode of the method comprises an automatic mode, a manual mode and a maintenance mode; the automatic mode and the manual mode can realize independent control of the temperature of each pass of the heater, and the aim of flexibly configuring the temperature of each pass of the heater is fulfilled.
Further, in the automatic control operation mode of the heater, the upper computer receives controller permission signals and sets the target temperature of the heating control motion sequence, firstly, the first item index sequence temperature is issued, heating control motion sequence temperature setting parameters are issued to the controller in sequence according to feedback signals of the controller, the controller allocates the heating power of the power regulator of each heating section, and feedback signals such as phase current, phase voltage, output percentage, total power, alarm and the like of the power regulator are uploaded to the upper computer in real time for real-time monitoring.
The multi-stage control flow of the heater is explained by combining with the attached figure 2, firstly, a system reads a heating control motion sequence, and performs the heating and constant temperature processes in the 1 st stage according to the number of control stages and target temperature data, when the heating and constant temperature processes in the 1 st stage are completed, the heating and constant temperature heating processes in the 2 nd stage are entered until the preset control stage is completed, and the continuous control of the heating and constant temperature heating processes of the heater is realized.
Further, in a manual control mode of the heater, the upper computer sends a power regulator control instruction to the controller, the controller independently controls the power regulators of the heating sections according to the received power regulator control instruction, and uploads feedback signals such as phase current, phase voltage, output percentage, total power, alarm and the like of the power regulators and operation process signal states to the upper computer in real time for real-time monitoring and display.
Aiming at the healthy use of the heating element, the power setting of the heating element is adjusted according to the initial resistance value and the change situation of the resistance value in the using process, and the heating element is strictly controlled within the allowable surface load range of the heating element when the heating power is set, so that the temperature of the heating element is uniformly distributed without being used in an overload manner.
Further, a heater temperature control algorithm is designed, and a heater heating process is divided into a plurality of stages to carry out heating and constant-temperature heating processes; in order to enable the surface load of the heating element to be within the allowable range, the parameters of the heating process flow of the heating element are configured, so that the temperature rise and the constant temperature of each control stage of the whole heating test are carried out according to set parameters; the heating control motion sequence can be set by combining the temperature characteristic of the heating element and the heating process technology of the heater, the whole process is flexibly configured to be controlled in multiple stages according to working conditions, and the temperature rise and constant temperature process of each stage is controlled.
Referring to fig. 3, specifically, the temperature parameter of the heater is continuously controlled as a controlled variable, and the heating of the heater is a temperature-raising and constant-temperature process, when the heating element is used, the temperature is raised according to the temperature characteristic of the heating element, and the surface load of the heating element is strictly controlled. And a segmented PID control strategy is provided by combining the temperature characteristic of the heating element and the heating process technology of the heater, so that segmented PID control of the heating process and the constant temperature heating process of the heater is realized. The temperature rising process is carried out at a specified speed by combining with the temperature characteristic curve of the heating element, the constant temperature process is carried out at a fixed time and a fixed value, and the temperature rising and the constant temperature control are operated and controlled by adopting different PID parameters.
Furthermore, during the heating process, the heating temperature needs to be continuously controlled, so the heating temperature is a controlled variable, and the heating power of the heater is a manipulated variable, namely, the temperature of the heater is controlled by adjusting the output power of the power regulator and further adjusting the heating power of the heating element. And a program segmented PID control strategy is adopted, and the set value of the program segmented PID control strategy is changed according to the program automatic set rate so as to realize continuous control of the heating temperature.
Furthermore, for the temperature rise process, the given value is increased at regular time and the incremental value is the same, along with the change of the given value, the deviation signal of the PID controller is changed, the control quantity output by operation is changed, the power regulator regulates the heating power of the heater, the change of the controlled variable according to the change rate of the given value is realized, and the temperature rise process is realized according to the specified rate; for the constant temperature process, the increment value of the given value is 0 within the specified time, namely the given value is constant, so the controlled variable is controlled to change according to the given value, and the constant temperature process of the heater is realized.
The temperature subsection control of the heater is set by an internal given value of a subsection PID control strategy, the parameter setting of the subsection PID is self-set by temperature rise control and constant temperature control respectively, and corresponding logic control is adopted. The heating process flow of the heater adopts multi-stage segmented PID control, the temperature rise process is controlled, the temperature rise process is changed and heated according to a specified rate, and a control system can be seen as a follow-up control system and needs to accurately and quickly track the temperature change of a given value, so that the integration Time and Absolute Error (Integrated Time and Absolute Error) are adopted as parameter setting indexes; the constant temperature process control is a constant value control system, and the control purpose of the constant temperature process control is to make the control deviation of the system output within an index range, so an Integrated squared error (Integrated squared error) is adopted as a parameter setting index.
The invention adopts a mode of heater sectional independent control along the process and configuration as required, and automatically controls the power output of the power regulator in a flow setting mode of a heating control motion sequence, thereby reducing the energy consumption and labor cost generated by heating work; the health index of the heating element is monitored in real time, the aged and damaged heating element is replaced in time, and the working efficiency of the heater is improved; by adopting a segmented PID control strategy, the defects of uneven temperature distribution and service life damage caused by overload use of a heating element are overcome, and the efficiency and the intelligent degree of the equipment are improved.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A heat accumulating type wind tunnel electric preheating heater system is characterized by comprising:
a heater divided axially into a plurality of heating segments, each heating segment having a plurality of heating elements;
a plurality of power regulators, each power regulator being connected to one of the heating elements for regulating the output power of the heating element;
the temperature detection control unit is used for detecting the temperature of each heating section in real time;
the controller is connected with the power regulator and the temperature detection control unit;
the upper computer is used for issuing a corresponding heating control instruction according to the heating process flow;
the controller is configured to:
collecting the temperature of each heating section detected by the temperature detection control unit, and feeding the temperature back to the upper computer;
controlling the power regulator according to a heating control instruction sent by the upper computer so as to control the temperatures of different heating sections;
and feeding back the working state of the power regulator to the upper computer.
2. A regenerative wind tunnel electric preheat heater system according to claim 1, wherein the operating modes of the control system include an automatic mode and a manual mode;
in the automatic mode, the heating control instruction comprises a heating control motion sequence and a power regulator control instruction, the motion sequence comprises heating target temperature and heating time of each heating section or output power and heating time of each heating section under different time sequences, the upper computer sequentially sends each piece of information of the motion sequence to the controller according to the time sequences, and the controller controls the power regulator according to the heating control motion sequence and the power regulator control instruction;
in the manual mode, the heating control instruction comprises a power regulator control instruction, and the controller independently controls the power regulator according to the power regulator control instruction.
3. A regenerative wind tunnel electric preheat heater system as claimed in claim 1 wherein said heating element is a resistance heated element, said system including a health detection unit;
the health detection unit is used for detecting the electric parameters of the heating element in real time, calculating the resistance of the heating element, analyzing the change trend and the aging degree of the resistance and determining the health index of the heating element.
4. A heat accumulating wind tunnel electric preheat heater system according to claim 1, wherein the controller is further configured to collect fault signals of the temperature detection control unit, the power regulator and the heating element, and send the fault signals to the upper computer.
5. A regenerative wind tunnel electric preheat heater system according to claim 1, wherein the controller controls the heating section based on a segmented PID control strategy to achieve temperature rise and constant temperature heating control.
6. A regenerative wind tunnel electric preheat heater system according to claim 1, wherein the controller comprises an emergency stop module for sending emergency stop commands to the power regulator and the temperature detection control unit to forcibly stop the heating operation of the heater.
7. A heat accumulating wind tunnel electric preheating heater system according to claim 1, wherein the heat accumulating wind tunnel electric preheating heater is split type, and a plurality of heating sections are detachably connected.
8. A method of controlling a regenerative wind tunnel electric preheat heater using a heater system as claimed in any one of claims 1 to 7, the method comprising:
detecting the temperature of each heating section in real time through the temperature detection control unit;
issuing a corresponding heating control instruction according to the heating process flow through the upper computer;
the controller is used for collecting the temperature of each heating section detected by the temperature detection control unit and feeding the temperature back to the upper computer;
controlling the power regulator according to a heating control instruction sent by the upper computer so as to control the temperatures of different heating sections;
and feeding back the working state of the power regulator to the upper computer.
9. A control method for a regenerative wind tunnel electric preheat heater according to claim 8, wherein the operation modes of the control method include an automatic mode and a manual mode;
in the automatic mode, the heating control instruction comprises a heating control motion sequence and a power regulator control instruction, the motion sequence comprises heating target temperature and heating time of each heating section or output power and heating time of each heating section under different time sequences, the upper computer sequentially sends each piece of information of the motion sequence to the controller according to the time sequences, and the controller controls the power regulator according to the heating control motion sequence and the power regulator control instruction;
in the manual mode, the heating control instruction comprises a power regulator control instruction, and the controller independently controls the power regulator according to the power regulator control instruction.
10. The control method of a heat accumulating wind tunnel electric preheating heater according to claim 8, wherein the controller controls the heating section to realize temperature rise and constant temperature control based on a segmented PID control strategy; the heating process flow comprises a plurality of heating stages, and each heating stage comprises a temperature rise period and a constant temperature period;
the PID control strategy of the temperature rise control is as follows: the integration time and the absolute error are used as parameter setting indexes, along with the change of a given value, a deviation signal of the PID changes, and a control quantity output through operation also changes; the power regulator regulates the heating power of the heating element to realize the change of the controlled variable according to the change rate of the given value, so that the temperature is raised according to the specified rate in the temperature raising process;
the PID control strategy of the constant temperature control is as follows: the integral square error is used as a parameter setting index, the given value is constant within the set time, and the controlled variable is controlled to change according to the given value, so that the constant temperature process of the heater is realized; the controlled variable is the temperature of the heater.
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