CN116880617A - High-temperature electric tracing temperature control system and method - Google Patents
High-temperature electric tracing temperature control system and method Download PDFInfo
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- CN116880617A CN116880617A CN202311086621.1A CN202311086621A CN116880617A CN 116880617 A CN116880617 A CN 116880617A CN 202311086621 A CN202311086621 A CN 202311086621A CN 116880617 A CN116880617 A CN 116880617A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 216
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 28
- 239000010703 silicon Substances 0.000 claims abstract description 28
- 238000012544 monitoring process Methods 0.000 claims description 30
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 9
- 239000011707 mineral Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 230000003993 interaction Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 description 10
- 230000000007 visual effect Effects 0.000 description 9
- 238000005485 electric heating Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
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Abstract
The invention provides a high-temperature electric tracing temperature control system and a method, which relate to the technical field of temperature control, wherein the system comprises: the temperature control cabinet comprises an input module, a PLC (programmable logic controller) and an output module, wherein the output module comprises a control loop, the control loop comprises at least one set of heating wire loop, and each set of heating wire loop comprises a temperature controller and a silicon controlled rectifier module. After determining a target heating wire loop to be put into, the PLC controller judges that the target heating wire loop meets the input condition according to a reference signal on the target heating wire loop input by the input module, controls the input of the target heating wire loop, acquires target temperature and control information, and sends the target temperature and the control information to a temperature controller in the target heating wire loop; the temperature controller controls the on-off of the controllable silicon module according to the target temperature and the current temperature and control information, so that the voltage output by the controllable silicon module is controlled to control the output power of the heating wire.
Description
Technical Field
The invention relates to the technical field of temperature control, in particular to a high-temperature electric tracing temperature control system and method.
Background
The electric tracing is to supplement the heat dissipated by the heat tracing body in the technological process by using the electric heating energy, so as to maintain the most reasonable technological temperature of the flowing medium. Electrical tracing is a uniform heat release over a large area along the length of a pipeline or tank volume, unlike electrical tracing where the heat load is highly concentrated at one point or small area. The electric tracing temperature gradient is small, the thermal stability time is long, the electric tracing temperature gradient is suitable for long-term use, and the required heat (electric power) is greatly lower than that of electric heating. The electric tracing has the advantages of high heat efficiency, energy conservation, simple design, convenient construction and installation, no pollution, long service life, capability of realizing remote control and automatic control, and the like.
The electric tracing is also widely used in power plants, is an effective pipeline heat preservation and antifreezing, even changes the temperature distribution to improve the equipment stress, and is a heating scheme widely applied.
However, the traditional electric tracing device has single function, overlap joint of hard circuits and inflexible temperature control.
Disclosure of Invention
The invention provides a high-temperature electric tracing temperature control system and a method, which control the output heating power of a heating wire by controlling a silicon controlled module so as to realize control of various temperatures and improve the flexibility of temperature control. The technical proposal is as follows:
in a first aspect, an embodiment of the present invention provides a high-temperature electric tracing temperature control system, including: the temperature control cabinet comprises an input module, a PLC and an output module, wherein the output module comprises a control loop, the control loop comprises at least one set of heating wire loop, and each set of heating wire loop comprises a temperature controller and a silicon controlled rectifier module; the input module is used for receiving a reference signal on the heating wire loop, and the reference signal is used for judging whether the heating wire loop meets the input condition;
the temperature sensor is used for measuring the current temperature of the heating wire and sending the current temperature to the temperature controller;
after determining a target heating wire loop to be put into, the PLC controller judges whether the target heating wire loop meets the input condition according to a reference signal on the target heating wire loop input by the input module, controls the target heating wire loop to be put into after judging that the target heating wire loop meets the input condition, and is used for acquiring target temperature and control information and sending the target temperature and the control information to a temperature controller in the target heating wire loop;
and the temperature controller controls the on-off of the silicon controlled module according to the target temperature and the current temperature and the control information, so as to control the voltage output by the silicon controlled module to realize the control of the output power of the heating wire.
Optionally, the control loop further comprises a total breaker for controlling whether an external three-phase alternating current power supply enters a power bus of the temperature control cabinet;
the heating wire loop also comprises a shunt power switch, an alternating current contactor and a current transducer;
the shunt power switch is used for realizing the disconnection and the connection of the heating wire loop and a power bus of the temperature control cabinet;
the alternating current contactor is used for realizing the opening and closing of the heating wire loop;
the current transducer is used for detecting loop current in the heating wire loop and sending the loop current to the input module.
Optionally, the control circuit includes 2 sets of heater strip return circuits, 2 sets of heater strip return circuits are twined in parallel in the surface of being companion's heat equipment, and 2 sets of heater strip return circuits adopt the interlocking mode, only allow one set of heater strip return circuit to put into operation at the same time.
Optionally, the control information includes at least one of: a manual control mode, an automatic control mode, a constant temperature control mode, and a linear temperature control mode;
when the control information is in a manual control mode, if the current running heating wire loop fails, automatically stopping the heating wire loop;
when the control information is in an automatic control mode, if the current heating wire loop fails, automatically stopping the heating wire loop, and automatically switching to the other heating wire loop to continue operation;
when the control information is in a constant temperature control mode, the temperature controller takes the target temperature as a target, automatically and quickly heats according to PID parameters of the temperature controller, and finally stabilizes at the target temperature;
when the control information is in a linear temperature control mode, the temperature controller is gradually increased or decreased to the target temperature at a linear rate with the target temperature as a target.
Optionally, the output module further comprises a monitoring module and/or an alarm module; the monitoring module and the alarm module are connected with the PLC;
the monitoring module is used for realizing a man-machine interaction function, displaying various information in the running process of the control loop, receiving a control instruction input by a user, and forwarding the control instruction to the PLC;
the alarm module is used for realizing an alarm function.
Optionally, the alarm function implemented by the alarm module includes at least one of:
an overtemperature alarm function, which is used for carrying out overtemperature alarm when the current temperature exceeds a set target temperature alarm value;
a short-circuit alarming function, which is used for carrying out short-circuit alarming when a short-circuit fault occurs in a heating wire loop which is currently operated;
a circuit breaking alarm function, which is used for performing circuit breaking alarm when a circuit breaking fault occurs in a current running heating wire loop;
and the hardware fault alarm function is used for carrying out control loop fault alarm when the temperature controller works abnormally.
Optionally, the temperature sensor is a thermocouple, and the thermocouple is disposed at a middle position of the heating wire.
Optionally, the connection between the temperature control cabinet and the heating wire adopts a cold end extension line of an armored mineral insulation heating cable, and the connection between the temperature sensor and the temperature control cabinet adopts a compensation wire.
Optionally, the heating wire adopts an armored mineral insulation heating wire, and is filled with high-purity magnesia powder.
In a second aspect, an embodiment of the present invention provides a method for controlling a temperature of high-temperature electric tracing, which is applied to the high-temperature electric tracing temperature control system in the first aspect, and the method includes:
measuring and obtaining the current temperature of the heating wire by using a temperature sensor, and sending the current temperature to a temperature controller;
after determining a target heating wire loop to be put into, a PLC controller judges whether the target heating wire loop meets the input condition according to a reference signal on the target heating wire loop, controls the target heating wire loop to be put into after judging that the target heating wire loop meets the input condition, acquires target temperature and control information, and sends the target temperature and the control information to a temperature controller in the target heating wire loop;
and the temperature controller controls the on-off of the silicon controlled rectifier module according to the target temperature and the current temperature and the control information, so as to control the voltage output by the silicon controlled rectifier module to realize the control of the output power of the heating wire.
The technical scheme of the invention has the beneficial effects that:
the high-temperature electric tracing temperature control system provided by the embodiment of the invention comprises: the temperature control cabinet comprises an input module, a PLC and an output module, wherein the output module comprises a control loop, the control loop comprises at least one set of heating wire loop, and each set of heating wire loop comprises a temperature controller and a silicon controlled rectifier module; the input module is used for receiving a reference signal on the heating wire loop, and the reference signal is used for judging whether the heating wire loop meets the input condition; the temperature sensor is used for measuring the current temperature of the heating wire and sending the current temperature to the temperature controller; after determining a target heating wire loop to be put into, the PLC controller judges whether the target heating wire loop meets the input condition according to a reference signal on the target heating wire loop input by the input module, controls the target heating wire loop to be put into after judging that the target heating wire loop meets the input condition, and is used for acquiring target temperature and control information and sending the target temperature and the control information to a temperature controller in the target heating wire loop; and the temperature controller controls the on-off of the silicon controlled module according to the target temperature and the current temperature and the control information, so as to control the voltage output by the silicon controlled module to realize the control of the output power of the heating wire. In the embodiment of the invention, the temperature controller carries out PID operation by using the deviation delta T between the target temperature Tref and the current temperature (namely the current measured value) TC, and the output power of the heating wire is controlled by the silicon controlled module, so that various temperature control functions are realized, and the flexibility of temperature control is improved.
Drawings
FIG. 1 is a schematic diagram of a high-temperature electric tracing temperature control system according to an embodiment of the present invention;
FIG. 2 is a second schematic diagram of a high-temperature electric tracing temperature control system according to an embodiment of the invention;
FIG. 3 is a third schematic diagram of a high-temperature electric tracing temperature control system according to an embodiment of the invention;
FIG. 4 is a schematic view of a heater mounting position according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for controlling temperature of high-temperature electric tracing according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided merely to facilitate a thorough understanding of embodiments of the invention. It will therefore be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
The embodiment of the invention provides a high-temperature electric tracing temperature control system and a high-temperature electric tracing temperature control method, which aim to realize control of output heating power of a heating wire (also called an electric heating wire) by controlling a silicon controlled module so as to realize various control and protection functions of temperature.
As shown in fig. 1, the high-temperature electric tracing temperature control system provided by the embodiment of the invention comprises a temperature control cabinet 100, heating wires 200 and a temperature sensor 300, wherein the temperature control cabinet 100 comprises an input module 110, a PLC (Programmable Logic Controller ) controller 120 and an output module 130, the output module 130 comprises a control loop 131, the control loop 131 comprises at least one set of heating wire loops, and each set of heating wire loop comprises a temperature controller 1311 and a silicon controlled rectifier module 1312;
the input module 110 is configured to receive a reference signal on the heating wire loop, where the reference signal is used to determine whether the heating wire loop meets a throw-in condition;
in the embodiment of the invention, the reference signal for judging whether the heating wire loop meets the input condition can comprise analog quantity input and switching value input sent by the related sensor. The analog quantity input is, for example, loop current of a heating wire loop, and the switching quantity input is, for example, a switching position signal of a switch, a tripping ISD position signal of the switch, a fault signal of a temperature controller and the like;
the temperature sensor 300 is configured to measure a current temperature of the heating wire 200 and send the current temperature to the temperature controller 1311;
in this embodiment of the present invention, the temperature sensor 300 may be a thermocouple, where the thermocouple is disposed at a middle position of the heating wire 200, and is configured to measure a temperature of the heating wire 200, and further send the measured current temperature to the temperature controller 1311;
after determining a target heating wire loop to be put into, the PLC controller 120 determines whether the target heating wire loop meets an input condition according to a reference signal on the target heating wire loop input by the input module 110, and after determining that the target heating wire loop meets the input condition, controls the target heating wire loop to be put into, and the PLC controller 120 is configured to obtain a target temperature and control information, and send the target temperature and the control information to the temperature controller 1311 in the target heating wire loop;
the PLC controller 120 in the embodiment of the present invention, on one hand, realizes data transmission with the temperature controller 1311, and can control and modify the target temperature in the temperature controller 1311, and various control parameters and usage modes (i.e., control information) in the PLC controller 120, and read various data information of the temperature controller 1311, such as a current actual temperature value, an alarm temperature value, and the like; on the other hand, whether the working loop (loop containing the heating wire) normally provides logic judgment and stops the related loop can be judged based on the tripping signal of the circuit breaker, the current signal of the current sensor and the like; in yet another aspect, various manual, automatic, linear, constant temperature mode selections and logic control can be implemented;
the temperature controller 1311 controls the on/off state of the thyristor module 1312 according to the target temperature and the current temperature and the control information, so as to control the voltage output by the thyristor module 1312 to realize the control of the output power of the heating wire 200.
In the embodiment of the present invention, after the PLC controller 120 inputs the target heating wire loop, the target temperature and the control information are sent to the temperature controller 1311 in the target heating wire loop, and the temperature controller 1311 controls the output power of the heating wire 200 through the thyristor module 1312 according to the deviation Δt between the target value (i.e., the target temperature) and the measured value (i.e., the current temperature) of the temperature, thereby realizing various control functions and protection functions of the temperature.
Optionally, in the embodiment of the present invention, the connection between the temperature control cabinet 100 and the heating wire 200 adopts a cold end extension line of an armored mineral insulation heating cable, and the connection between the temperature sensor 300 and the temperature control cabinet 100 adopts a compensation wire. The armored mineral insulated heating wire can realize the high temperature control requirement of 800 ℃.
Optionally, the control circuit 131 in the embodiment of the present invention further includes a total breaker, for controlling whether the external three-phase ac power enters the power bus of the temperature control cabinet;
the heating wire loop also comprises a shunt power switch, an alternating current contactor and a current transducer;
the shunt power switch is used for realizing the disconnection and the connection of the heating wire loop and a power bus of the temperature control cabinet;
the alternating current contactor is used for realizing the opening and closing of the heating wire loop;
the current transducer is used for detecting loop current in the heating wire loop and sending the loop current to the input module.
Optionally, the control loop 131 in an embodiment of the present invention includes multiple sets of heater wire loops. Preferably, the control circuit 131 includes 2 sets of heating wire loops, the 2 sets of heating wire loops are wound on the surface of the heat tracing device in parallel, and the 2 sets of heating wire loops adopt an interlocking mode, and only one set of heating wire loop is allowed to be put into operation at the same time. In practical application, the 2 sets of heating wire loops can be set as a main loop and a standby loop, and only one heating wire is allowed to run at the same time by adopting two modes of program software interlocking and circuit hardware interlocking.
Optionally, the control information in the embodiment of the present invention includes at least one of the following: a manual control mode, an automatic control mode, a constant temperature control mode, and a linear temperature control mode;
when the control information is in a manual control mode, if the current running heating wire loop fails, automatically stopping the heating wire loop;
when the control information is in an automatic control mode, if the current heating wire loop fails, automatically stopping the heating wire loop, and automatically switching to the other heating wire loop to continue operation;
when the control information is in a constant temperature control mode, the temperature controller takes the target temperature as a target, automatically and quickly heats according to PID parameters of the temperature controller, and finally stabilizes at the target temperature;
when the control information is in a linear temperature control mode, the temperature controller is gradually increased or decreased to the target temperature at a linear rate with the target temperature as a target.
Optionally, the output module 130 in the embodiment of the present invention may further include a monitoring module and/or an alarm module; the monitoring module and the alarm module are both connected with the PLC controller 120;
the monitoring module is configured to implement a man-machine interaction function, and is configured to display various information in the operation process of the control loop 131, receive a control instruction input by a user, and forward the control instruction to the PLC controller 120;
the alarm module is used for realizing an alarm function.
In the embodiment of the present invention, the alarm function that can be implemented by the alarm module may include at least one of the following:
an overtemperature alarm function, which is used for carrying out overtemperature alarm when the current temperature exceeds a set target temperature alarm value;
a short-circuit alarming function, which is used for carrying out short-circuit alarming when a short-circuit fault occurs in a heating wire loop which is currently operated;
a circuit breaking alarm function, which is used for performing circuit breaking alarm when a circuit breaking fault occurs in a current running heating wire loop;
and the hardware fault alarm function is used for carrying out control loop fault alarm when the temperature controller works abnormally.
In order to better illustrate the high-temperature electric tracing temperature control system provided by the embodiment of the invention, the applicant takes a practical case as an example for illustration.
The high-temperature electric tracing temperature control system provided by the embodiment of the invention can prevent uneven local temperature distribution and even stress damage to equipment by supposing that electric tracing heating is locally carried out on a certain high-temperature pipeline. As shown in fig. 2, 3 and 4, in order to ensure reliable operation, the embodiment of the invention adopts 2 sets of heating wire loops, one is used for one, the heating wires adopt armored mineral insulation heating wires, high-purity magnesia powder is filled, and the invention has enough temperature resistance, heat conduction and insulation properties, and ensures that the shell is not conductive, is not broken and the heating wires are not fused in the working state; the two sets of heating wire loops are wound in parallel and uniformly wound on the surface of the heat tracing equipment and are in close contact with the heat tracing equipment, so that the control requirement of the high temperature of 800 ℃ can be realized.
The temperature sensor adopts thermocouples, a K-shaped armored thermocouple is configured in each set of heating wire loop and is respectively arranged in the middle of each heating wire for measuring the temperature of the corresponding main/standby heating wires.
The input module in the temperature control cabinet comprises an analog input module and a switching value input module, and is used for receiving analog input and switching value input transmitted by related sensors, and the analog input module can adopt Siemens 6 ES7-288-3 AE08-0AA0. In the embodiment of the invention, the analog quantity is input as loop current in each heating wire loop, and the switching value is input as a power switch switching-on and switching-off position, a power switch tripping position and a temperature controller fault signal corresponding to each heating wire loop.
The PLC controller in the temperature control cabinet can adopt Siemens 6ES7 288-1ST40-0AA0 controller and the like. The real-time control of the field control object is realized by receiving the field real-time information acquired by the input module, outputting a control signal after logic processing is performed.
The output module in the control by temperature change cabinet includes: control loop, monitoring module and alarm module.
The control loop comprises an alternating current incoming line power cable, 1 total breaker (QF 01) and 2 sets of heating wire loops, wherein each set of heating wire loop comprises a shunt power switch (QF 11/QF 12), an alternating current contactor (KM 11/KM 12), a temperature controller (TK 11/YK 12), a silicon controlled rectifier module (SCR 11/SCR 12), a current transducer (VA 11/VA 12), a plurality of indicator lamps, a cooling fan and the like.
The monitoring module can be a monitoring touch screen and is used for realizing a man-machine interaction function. The monitoring touch screen is in connection communication with the PLC through a network cable, the operating system of the monitoring touch screen is Win7, monitoring software VxSCADA is installed, an electric tracing operation picture can be displayed, a historical trend is stored, and the storage capacity of the hard disk can meet the operation requirement of 24 months. The configuration software GCS controller is installed in the monitoring touch screen, the PLC controller can be configured, the configuration software is a Chinese interface, and a functional block diagram configuration mode is supported.
The alarm module can be a specific alarm device, such as an audible and visual alarm device, and the like, and is used for realizing an alarm function.
In practical application, the PLC controls the audible and visual alarm device to send out audible and visual alarm signals, and meanwhile, the picture of the monitoring touch screen can be controlled to display various fault information so as to remind operators of heat tracing belt faults. After personnel input confirmation alarm information on the monitoring touch screen, the PLC controller controls the audible and visual alarm device to stop sending out audible and visual alarm signals.
The cable is used for realizing connection of the thermocouple and the temperature controller, and the heating wire is connected with the silicon controlled module. Specifically, the connection between the temperature control cabinet and the electric tracing band adopts a cold end extension line of an armored mineral insulation heating cable, and the connection between the thermocouple and the temperature control cabinet adopts a compensation wire.
When the embodiment of the invention is practically applied, the three-phase alternating-current power supply enters the power bus of the temperature control cabinet through the total breaker (QF 01), and the indicator lamps HL001 (yellow), HL002 (green) and HL003 (red) are used for indicating whether the alternating-current incoming line power supply is normal or not. The embodiment of the invention is provided with two sets of heating wire loops, one set of heating wire loops is mainly represented by 1# and the other set of heating wire loops is standby (represented by 2 #), and two sets of electric tracing bands are wound in parallel and uniformly wound on the surface of heat tracing equipment and are in close contact with the surface of the heat tracing equipment.
As shown in fig. 3, the power supply of the 1# main heating wire is obtained from the 380V line voltage of the UV phase, and is connected into a closed loop through a switch QF11 (with a leakage protection switch ioF and a trip position switch iSD), a 1# main loop power supply indicator lamp HL111, an ac contactor KM11, a safety FU11/FU12 and a silicon controlled rectifier module SCR 11. A current transducer VA11 is connected in series in the loop for sensing the loop current.
As shown in fig. 3, the power supply of the 2# standby heating wire is taken from the 380V line voltage of the VW phase, and is connected into a closed loop through a switch QF12 (with a leakage protection switch ioF and a trip position switch iSD), a 2# standby loop power supply indicator lamp HL121, an ac contactor KM12, a safety FU21/FU22 and a silicon controlled rectifier module SCR12, and a current transducer VA12 is connected in series in the loop for detecting loop current.
The current transducers VA11 and VA12 send the detected loop current to the PLC controller through the analog input module for loop current display and abnormality determination.
The 1# main heating wire loop and the 2# standby heating wire loop are respectively provided with a temperature controller TK11/TK12. The temperature detected by the K-type thermocouple is sent into a corresponding temperature controller for temperature display and control, and the temperature controller is communicated with a PLC controller through RS485 communication. The temperature controller controls the on-off of the corresponding controllable cabinet module according to the target temperature, the current temperature and the control information, thereby controlling the voltage output by the controllable silicon module, further controlling the output power of the heating wire and carrying out temperature regulation.
As shown in FIG. 3, the 220V control power supply provides working power for the temperature controller through the control power switch QF-K in the temperature control cabinet and performs selection, starting and operation indication of the heating wire loop.
The control loop power indicator lamp HL000 is used for indicating that the control loop power is normal.
The direct current power supply module POW converts 220V power supply into 24V direct current and provides power for the PLC controller and the monitoring touch screen.
KA11 and KA12 in the control circuit are 24V control relays for selecting, inputting and operating indication of the heating wire circuit. The PLC controls the input and the shutdown of the KA11 and the KA 12. Wherein KA11 is the control relay of 1# main heater strip, HL112 is the operation indicator lamp of 1# main heater strip, KA12 is the control relay of 2# spare heater strip, and HL122 is the operation indicator lamp of 2# spare heater strip. The normally open contact of KA11 and the normally closed contact of KA12 in the control loop are connected and then connected with KM11, the normally open contact of KA12 and the normally closed contact of KA11 are connected and then connected with KM12, loop interlocking is carried out, only one heating wire loop is allowed to be put into operation, and the simultaneous operation is prevented from causing the overtemperature of heat tracing equipment.
A fan FS is arranged in the temperature control cabinet, and provides power through QF3, so that good ventilation and heat dissipation conditions are provided for the temperature control cabinet.
The PLC is connected with the temperature controller through RS485 communication, and is connected with the monitoring touch screen through a network cable to carry out command issuing and data transmission and display. The PLC receives the on-off position signal of the empty switch QF11/QF12 in the cabinet, the tripping ISD position signal of the QF11/QF12 and the fault signal switching value input of the temperature controller TK11/TK12, and carries out logic and abnormality judgment. The PLC controls the switching of KA11 and KA12 through the switching value output, so as to control the switching and the withdrawal of the heating wire. When the PLC detects a fault, audible and visual alarm prompt is carried out through the alarm module.
In an embodiment of the present invention, the control information includes at least one of the following: a manual control mode, an automatic control mode, a constant temperature control mode, and a linear temperature control mode;
when the control information is in a manual control mode, if the current running heating wire loop fails, automatically stopping the heating wire loop; when the control information is in an automatic control mode, if the current heating wire loop fails, the heating wire loop is automatically stopped, and the operation is automatically switched to the other heating wire loop to continue. Namely, in the embodiment of the invention, in the automatic control mode, when the operation loop fails and the loop is automatically stopped, the loop is automatically switched to the standby operation, and the loop is not automatically switched under the manual control.
When the control information is in a constant temperature control mode, the temperature controller takes the target temperature as a target, automatically and quickly heats according to PID parameters of the temperature controller, and finally stabilizes at the target temperature; when the control information is in a linear temperature control mode, the temperature controller is gradually increased or decreased to the target temperature at a linear rate by taking the target temperature as a target, wherein the target temperature can be gradually reached according to the required set time, and the purpose of linear temperature control is realized.
The embodiment of the invention also provides the following protection functions:
(1) Overtemperature protection function: when the measured temperature of the heating wires exceeds the set temperature alarm value, the heating wires stop heating, and an over-temperature audible and visual alarm is sent. And the standby heating wire can be automatically switched to operate in the automatic control mode. When the temperature is reduced to below the temperature alarm value and no other faults exist, manual reset alarm can be carried out, and the heating operation is manually restored according to the needs;
(2) Short-circuit protection and switching function: when the short circuit fault occurs in the heating wire loop in use, the power supply of the heating wire is stopped immediately and an alarm is given out at the same time. And immediately switching to use the standby electric tracing band in the automatic control mode. When the standby electric tracing band is short-circuited, immediately stopping power supply, and sending out a continuous alarm prompt until the alarm is manually eliminated;
(3) And (3) breaking judgment and switching functions: when the heating wire in use is broken due to the reasons of burning out, idle tripping and the like, the power supply of the heating wire is stopped immediately and an alarm is sent out. And immediately switching to use the standby electric tracing band in the automatic control mode. When the standby electric tracing band is disconnected, a continuous alarm prompt is sent until the alarm is manually eliminated;
(4) Hardware fault judging and switching functions: when the temperature control instrument works abnormally, the output of the instrument and the output of the loop current are asynchronous, the fault of the control loop is judged, the power supply of the heating wire is immediately stopped, and an alarm is sent out. And immediately switching to use the standby electric tracing band in the automatic control mode. When the standby electric tracing band fails, the power supply is stopped immediately, and a continuous alarm prompt is sent out until the alarm is eliminated manually.
The practical application process of the embodiment of the invention is as follows:
(1) The upstream 380V three-phase power supply is switched on by a main breaker QF01 and then is sent into an alternating current bus of the temperature control cabinet, and the incoming line power supply indicator lamps HL001 (yellow), HL002 (green) and HL003 (red) are lightened;
(2) Sequentially closing the inner space of the cabinet, opening QF11 and QF12, confirming that corresponding loop power supply indication lamps are sequentially on, closing a control power supply switch QF-K in the temperature control cabinet, controlling a power supply indication lamp HL000 to be on, indicating normal, checking that the power-on display of two temperature control instruments TK11/TK12 is normal, checking that the power-on display of a monitoring touch screen is normal, giving no abnormal alarm, and checking that the PLC is powered on.
(3) Manual mode constant temperature control:
and selecting a manual control mode and a constant temperature control mode on the monitoring touch screen.
Setting a target temperature value P1 (which is larger than a current actually measured temperature value P0), selecting a 1# main heating wire for use, clicking and starting, checking a control relay KA11 to obtain electricity, enabling a corresponding loop contactor KM11 to be in suction, operating an indicator lamp HL112 to be on, checking that the temperature display of the 1# main temperature controller and the temperature display of a touch screen are increased, enabling the loop current of the 1# main heating wire to be normal, and enabling a PLC to be normal.
At this time, the 2# standby electric heating wire is started on the monitoring touch screen, because the 2# standby heating wire is locked, and the 2# standby electric heating wire cannot be started. After a certain period of heating, the temperature of the final 1# main heating wire stably runs near a set value (namely, a target temperature). The operator clicks and stops the 1# main heating wire on the monitoring touch screen, checks that the control relay KA11 is powered off, the corresponding loop contactor KM11 is disconnected, the operation indicator lamp HL112 is turned off, the 1# main temperature controller temperature display is checked, the monitoring touch screen temperature display is reduced to be close to the initial temperature, and the 1# main heating wire loop current indication is normally 0.
(4) Manual mode linear temperature control:
and selecting a manual control mode and a linear temperature control mode on the monitoring touch screen.
Linear temperature rise control: setting a target temperature value P1 (greater than a current actually measured temperature value P0), linearly increasing the required time T1, selecting a 1# main heating wire for use, clicking and starting, checking and controlling a relay KA11 to be powered on, enabling a corresponding loop contactor KM11 to be attracted, operating an indicator lamp HL112 to be on, checking the temperature display of the 1# main temperature controller and the temperature display of a touch screen to be increased, and enabling the loop current of the 1# main heating wire to be normal, wherein a PLC (programmable logic controller) is normal. At this time, the 2# standby electric heating wire is started on the touch screen, and cannot be started because the 2# standby electric heating wire is locked. After the set linear temperature rise time T, the temperature of the final 1# main heating wire stably runs near the set value (namely, the target temperature).
And (3) linear cooling control: setting a target temperature value P2 (lower than an actual temperature value P1 after current heating), linearly reducing the temperature by a required time T2, starting operation, wherein in the temperature reducing process, the temperature target value is reduced linearly and gradually through calculation, if the actual temperature value is greater than the target value, the temperature controller does not output, the loop current is displayed as 0, if the actual temperature value is smaller than the target value, the temperature controller outputs normally, the loop current is displayed normally, the actual temperature is maintained at the target temperature, and finally, the 1# main heating wire temperature is stably operated near the set value P2 through the set linear temperature reducing time T2.
Clicking the shutdown 1# main heating wire on the monitoring touch screen, checking that the control relay KA11 is powered off, disconnecting the corresponding loop contactor KM11, extinguishing the operation indicator lamp HL112, checking that the 1# main temperature controller temperature display and the monitoring touch screen temperature display decrease to the initial temperature, and indicating that the loop current of the 1# main heating wire is normally 0.
(5) Automatic control mode and alarm of temperature control cabinet
And selecting an automatic control mode on the monitoring touch screen, and starting the 1# main heating wire or the 2# standby heating wire.
When the main loop of the No. 1 or No. 2 heating wire is in power failure and open circuit (a loop power switch QF11/QF12 is opened, an ISD contact of a short-circuit tripping switch is closed, a fuse is fused, the heating wire is blown), overtemperature (the measured temperature of a thermocouple exceeds the overtemperature alarm temperature), control loop faults (the output of a temperature controller is asynchronous with the output of loop current), a PLC (programmable logic controller) can make fault judgment, a monitoring touch screen displays a corresponding heating loop alarm, a temperature control cabinet displays an audible and visual alarm corresponding to the loop, the heating wire corresponding to the fault is automatically stopped, an operation indicator lamp is turned off, and standby heating wire is immediately and automatically put into operation. After the fault is processed, the alarm can be manually reset on the monitoring touch screen, and the audible and visual indication is turned off. And manually feeding the heating wires of the original working circuit according to the requirement.
According to the embodiment of the invention, the power of the electric tracing band is regulated through the silicon controlled module, so that the target control temperature is realized. The high temperature control requirement of 800 ℃ can be realized through armoured mineral insulated heating wires. The man-machine interaction interface is arranged, so that the personnel operation efficiency is greatly improved, various control modes and various fault protection functions are realized, and the system is powerful in function, practical, effective, stable and reliable. The fault can be positioned quickly, and the maintenance time is saved.
Based on the high-temperature electric tracing temperature control system provided by the foregoing embodiment of the present invention, the embodiment of the present invention further provides a high-temperature electric tracing temperature control method, where the method is applied to the high-temperature electric tracing temperature control system described above, as shown in fig. 5, and the method includes:
step 101, measuring and obtaining the current temperature of a heating wire by using a temperature sensor, and sending the current temperature to a temperature controller;
step 102, after determining a target heating wire loop to be put into, a PLC controller judges whether the target heating wire loop meets the input condition according to a reference signal on the target heating wire loop, and after judging that the target heating wire loop meets the input condition, controls the input of the target heating wire loop, acquires target temperature and control information, and sends the target temperature and the control information to a temperature controller in the target heating wire loop;
and step 103, the temperature controller controls the on-off of the silicon controlled module according to the target temperature and the current temperature and the control information, so as to control the voltage output by the silicon controlled module to realize the control of the output power of the heating wire.
It should be noted that, the high-temperature electric tracing temperature control method is applied to the high-temperature electric tracing temperature control system in the foregoing embodiment, and all implementation means in the foregoing system embodiment are applicable to the embodiment of the high-temperature electric tracing temperature control method, so that the same technical effect can be achieved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A high temperature electrical trace heat temperature control system, comprising: the temperature control cabinet comprises an input module, a PLC and an output module, wherein the output module comprises a control loop, the control loop comprises at least one set of heating wire loop, and each set of heating wire loop comprises a temperature controller and a silicon controlled rectifier module; the input module is used for receiving a reference signal on the heating wire loop, and the reference signal is used for judging whether the heating wire loop meets the input condition;
the temperature sensor is used for measuring the current temperature of the heating wire and sending the current temperature to the temperature controller;
after determining a target heating wire loop to be put into, the PLC controller judges whether the target heating wire loop meets the input condition according to a reference signal on the target heating wire loop input by the input module, controls the target heating wire loop to be put into after judging that the target heating wire loop meets the input condition, and is used for acquiring target temperature and control information and sending the target temperature and the control information to a temperature controller in the target heating wire loop;
and the temperature controller controls the on-off of the silicon controlled module according to the target temperature and the current temperature and the control information, so as to control the voltage output by the silicon controlled module to realize the control of the output power of the heating wire.
2. The high temperature electrical tracing temperature control system of claim 1, wherein said control loop further comprises a total circuit breaker for controlling whether an external three-phase ac power source enters a power bus of said temperature control cabinet;
the heating wire loop also comprises a shunt power switch, an alternating current contactor and a current transducer;
the shunt power switch is used for realizing the disconnection and the connection of the heating wire loop and a power bus of the temperature control cabinet;
the alternating current contactor is used for realizing the opening and closing of the heating wire loop;
the current transducer is used for detecting loop current in the heating wire loop and sending the loop current to the input module.
3. The high-temperature electric tracing temperature control system according to claim 1, wherein the control circuit comprises 2 sets of heating wire circuits, the 2 sets of heating wire circuits are wound on the surface of the heat tracing equipment in parallel, and the 2 sets of heating wire circuits adopt an interlocking mode, and only one set of heating wire circuit is allowed to be put into operation at the same time.
4. A high temperature electrical tracing temperature control system according to claim 3, wherein said control information comprises at least one of: a manual control mode, an automatic control mode, a constant temperature control mode, and a linear temperature control mode;
when the control information is in a manual control mode, if the current running heating wire loop fails, automatically stopping the heating wire loop;
when the control information is in an automatic control mode, if the current heating wire loop fails, automatically stopping the heating wire loop, and automatically switching to the other heating wire loop to continue operation;
when the control information is in a constant temperature control mode, the temperature controller takes the target temperature as a target, automatically and quickly heats according to PID parameters of the temperature controller, and finally stabilizes at the target temperature;
when the control information is in a linear temperature control mode, the temperature controller is gradually increased or decreased to the target temperature at a linear rate with the target temperature as a target.
5. The high temperature electrical tracing temperature control system of claim 1, wherein said output module further comprises a monitoring module and/or an alarm module; the monitoring module and the alarm module are connected with the PLC;
the monitoring module is used for realizing a man-machine interaction function, displaying various information in the running process of the control loop, receiving a control instruction input by a user, and forwarding the control instruction to the PLC;
the alarm module is used for realizing an alarm function.
6. The high temperature electrical tracing temperature control system of claim 5, wherein said alarm function implemented by said alarm module comprises at least one of:
an overtemperature alarm function, which is used for carrying out overtemperature alarm when the current temperature exceeds a set target temperature alarm value;
a short-circuit alarming function, which is used for carrying out short-circuit alarming when a short-circuit fault occurs in a heating wire loop which is currently operated;
a circuit breaking alarm function, which is used for performing circuit breaking alarm when a circuit breaking fault occurs in a current running heating wire loop;
and the hardware fault alarm function is used for carrying out control loop fault alarm when the temperature controller works abnormally.
7. The high temperature electric tracing temperature control system of claim 1, wherein said temperature sensor is a thermocouple, said thermocouple being disposed at a central position of said heating wire.
8. The high-temperature electric tracing temperature control system according to claim 1, wherein,
the temperature control cabinet is connected with the heating wire by adopting a cold end extension line of an armored mineral insulation heating cable, and the temperature sensor is connected with the temperature control cabinet by adopting a compensation wire.
9. The high temperature electric tracing temperature control system of claim 1, wherein said heating wire is an armored mineral insulated heating wire filled with high purity magnesia powder.
10. A method for controlling the temperature of high-temperature electric tracing, which is applied to the temperature control system of the high-temperature electric tracing according to any one of claims 1 to 9, and comprises the following steps:
measuring and obtaining the current temperature of the heating wire by using a temperature sensor, and sending the current temperature to a temperature controller;
after determining a target heating wire loop to be put into, a PLC controller judges whether the target heating wire loop meets the input condition according to a reference signal on the target heating wire loop, controls the target heating wire loop to be put into after judging that the target heating wire loop meets the input condition, acquires target temperature and control information, and sends the target temperature and the control information to a temperature controller in the target heating wire loop;
and the temperature controller controls the on-off of the silicon controlled rectifier module according to the target temperature and the current temperature and the control information, so as to control the voltage output by the silicon controlled rectifier module to realize the control of the output power of the heating wire.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117492492A (en) * | 2023-11-02 | 2024-02-02 | 华能山东石岛湾核电有限公司 | Optimizing method for equipment surface temperature distribution |
| CN117492492B (en) * | 2023-11-02 | 2024-05-31 | 华能山东石岛湾核电有限公司 | Optimizing method for equipment surface temperature distribution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117492492A (en) * | 2023-11-02 | 2024-02-02 | 华能山东石岛湾核电有限公司 | Optimizing method for equipment surface temperature distribution |
| CN117492492B (en) * | 2023-11-02 | 2024-05-31 | 华能山东石岛湾核电有限公司 | Optimizing method for equipment surface temperature distribution |
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