CN109688638B - Automatic control system and control method for multistage series electric heating device - Google Patents
Automatic control system and control method for multistage series electric heating device Download PDFInfo
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- CN109688638B CN109688638B CN201811571645.5A CN201811571645A CN109688638B CN 109688638 B CN109688638 B CN 109688638B CN 201811571645 A CN201811571645 A CN 201811571645A CN 109688638 B CN109688638 B CN 109688638B
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- 238000005485 electric heating Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
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- Control Of Resistance Heating (AREA)
Abstract
The invention belongs to the control technology of electric heating equipment, and particularly relates to an automatic control system of a multistage series electric heating device. The system comprises a multi-stage electric heating unit, wherein each stage of electric heating unit consists of an electric heater, a power controller, an overtemperature protection module, an overtemperature control PID operation module and a power control operation module; the detection output end of the outlet detection module at the outlet is connected to an outlet control PID operation module; in each stage, the overtemperature protection module detects the temperature and outputs the temperature to the overtemperature control PID operation module, and the temperature is compared with a temperature set value; the operation result output end is connected to one input end of the power control operation module, the signal of the other input end of the power control operation module comes from the result output end of the outlet control PID operation module, and the power control operation module outputs to the power controller. The invention can stably raise the outlet heating temperature, and has high control precision and long service life.
Description
Technical Field
The invention belongs to the control technology of electric heating equipment, and particularly relates to an automatic control system of a multistage series electric heating device.
Background
The resistive continuous heating device is an electric heating system for continuously heating a medium in multiple stages to meet the requirement of ultrahigh temperature, and generally comprises multiple stages of electric heating units connected in series, so that the heated medium is heated to ultrahigh temperature in a gradual circulation process. The control system of the existing multi-stage electric heater generally has two functions of over-temperature protection and temperature control; each stage of electric heating unit is provided with a respective overtemperature protection module, independent overtemperature protection is provided for each electric heating unit, and if the temperature in the unit exceeds the temperature set value of the electric heating unit of the stage, the corresponding electric heating unit must be powered off to stop heating; the temperature control module generally collects the final stage or outlet temperature of the whole device, compares the final stage or outlet temperature with the set outlet temperature by using a PID algorithm, and uses the operation result as the power adjustment basis of each stage of electric heating unit so as to realize stable control of the outlet temperature. These two control processes typically run each independently. However, for the multi-stage series electric heater, because of the large temperature difference between the inlet temperature and the outlet temperature, under the working conditions of low flow and short heating time, the electric heating units of each stage can frequently touch the protection temperature, and the frequent power-off protection makes the heated medium difficult to heat and stabilize at the ultrahigh temperature above 700 ℃. And frequent actions of over-temperature protection are not beneficial to prolonging the service life of equipment.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic control system and a control method for a multistage series electric heating device, which can stably improve the heating temperature of an outlet, and has high control precision and long operation life.
The automatic control system of the multistage series electric heating device comprises multistage electric heating units, wherein each stage of electric heating unit consists of an electric heater, a power controller, an overtemperature protection module, an overtemperature control PID operation module and a power control operation module;
The electric heaters of the electric heating units of each stage are sequentially connected in series on a heated medium conveying route, an outlet detection module capable of detecting the temperature of a medium outlet is arranged at the outlet of the electric heater of the final stage, and the detection output end of the outlet detection module is connected to an outlet control PID operation module and can be compared with an outlet temperature set value of the whole heating device;
In each stage of electric heating unit, the power controller is used for controlling the heating power of the electric heater; the over-temperature protection module is arranged in the electric heater of the stage and is used for over-temperature protection control; the overtemperature protection module can detect the actual temperature of the monitoring area, output the actual temperature to the overtemperature control PID operation module and perform comparison operation with an overtemperature set value of the primary heater; the operation result output end of the overtemperature control PID operation module is connected to one input end of the power control operation module, the signal of the other input end of the power control operation module is from the result output end of the outlet control PID operation module, and the operation result output end of the power control operation module is output to the power controller.
Preferably, the electric heating unit has 4-8 stages.
The control method of the multistage series electric heating device is based on the device, and comprises the following steps:
a. Heating the medium flowing from the inlet to the outlet through a multi-stage electric heating unit, and performing over-temperature protection on the medium by an electric heater in each stage through a corresponding over-temperature protection module;
b. Calculating the difference value between the real-time monitoring temperature of each stage of electric heater and the overtemperature set value of the electric heater of the stage of electric heater in an overtemperature control PID operation module through a PID algorithm to obtain a power adjustment reference value, and outputting the power adjustment reference value to the power control operation module of the stage; the greater the difference, the lower the power adjustment reference indicates the adjusted power;
c. Calculating the difference value between the detected temperature of the outlet medium and the set value of the temperature of the outlet medium in an outlet control PID operation module through a PID algorithm to obtain another power adjustment reference value, and outputting the power adjustment reference value to the power control operation module of each stage; the greater the difference, the higher the power adjustment reference indicates the adjusted power;
d. In each stage of electric heating unit, the power adjustment reference values of the over-temperature control PID operation module and the outlet control PID operation module are subjected to superposition operation in the power control operation module, the operation result is output to the power controller, and the heating power of the stage of electric heater is adjusted through the power controller.
In the step d, the power adjustment reference values from the over-temperature control PID operation module and the outlet control PID operation module are subjected to superposition operation according to the set weight values.
The invention has the advantages that: the power regulation parameters of the electric heaters of each stage are obtained, and the parameters of the total outlet temperature and the parameters of the overtemperature state of the electric heater of the stage are referenced, so that the stable temperature rising requirement of the medium can be met when the power is regulated, the electric heaters are prevented from reaching the overtemperature set temperature too fast, the frequency of overtemperature protection outage is reduced, the temperature rising speed is improved, the overtemperature is easier to reach, the stability of the outlet medium temperature is ensured, and the service life of a protection device is prolonged.
Drawings
FIG. 1 is a system schematic diagram of an embodiment of the present invention.
Detailed Description
As shown in the figure, the automatic control system of the multistage series electric heating device comprises six stages of electric heating units, wherein each stage of electric heating unit consists of an electric heater, a power controller, an overtemperature protection module, an overtemperature control PID operation module and a power control operation module;
The electric heaters of the electric heating units of all stages are sequentially connected in series on a heated medium conveying route, the electric heaters are one-level electric heater to six-level electric heater according to the sequence from a medium inlet to an outlet, an outlet detection module capable of detecting the medium outlet temperature T is arranged at the outlet of the electric heater of the final stage, and the detection output end of the outlet detection module is connected to an outlet control PID operation module and can carry out comparison operation with the outlet temperature set value of the whole heating device;
In each stage of electric heating unit, the power controller is used for controlling the heating power of the electric heater; the over-temperature protection module is arranged in the electric heater of the stage and is used for over-temperature protection control; the overtemperature protection module can detect the actual temperature of the monitoring area, output the actual temperature to the overtemperature control PID operation module and perform comparison operation with an overtemperature set value of the primary heater; the operation result output end of the overtemperature control PID operation module is connected to one input end of the power control operation module, the signal of the other input end of the power control operation module comes from the result output end of the outlet control PID operation module, and the operation result output end of the power control operation module is output to the power controller.
The operation method of the device comprises the following steps:
a. Heating the medium flowing from the inlet to the outlet through a multi-stage electric heating unit, and performing over-temperature protection on the medium by an electric heater in each stage through a corresponding over-temperature protection module;
b. Calculating the difference value between the real-time monitoring temperature of each stage of electric heater and the overtemperature set value of the electric heater of the stage of electric heater in an overtemperature control PID operation module through a PID algorithm to obtain a power adjustment reference value, and outputting the power adjustment reference value to the power control operation module of the stage; the greater the difference, the lower the power adjustment reference indicates the adjusted power;
c. Calculating the difference value between the detected temperature of the outlet medium and the set value of the temperature of the outlet medium in an outlet control PID operation module through a PID algorithm to obtain another power adjustment reference value, and outputting the power adjustment reference value to the power control operation module of each stage; the greater the difference, the higher the power adjustment reference indicates the adjusted power;
d. In each stage of electric heating unit, the power adjustment reference values from the over-temperature control PID operation module and the outlet control PID operation module are subjected to superposition operation in the power control operation module according to the set weight values, the operation result is output to the power controller, and the heating power of the stage of electric heater is adjusted through the power controller.
Claims (4)
1. An automatic control system of a multistage series electric heating device is characterized in that:
the electric heating device comprises a multi-stage electric heating unit, wherein each stage of electric heating unit consists of an electric heater, a power controller, an overtemperature protection module, an overtemperature control PID operation module and a power control operation module;
The electric heaters of the electric heating units of each stage are sequentially connected in series on a heated medium conveying route, an outlet detection module capable of detecting the temperature of a medium outlet is arranged at the outlet of the electric heater of the final stage, and the detection output end of the outlet detection module is connected to an outlet control PID operation module and can be compared with an outlet temperature set value of the whole heating device;
In each stage of electric heating unit, the power controller is used for controlling the heating power of the electric heater; the over-temperature protection module is arranged in the electric heater of the stage and is used for over-temperature protection control; the overtemperature protection module can detect the actual temperature of the monitoring area, output the actual temperature to the overtemperature control PID operation module and perform comparison operation with an overtemperature set value of the primary heater; the operation result output end of the overtemperature control PID operation module is connected to one input end of the power control operation module, the signal of the other input end of the power control operation module is from the result output end of the outlet control PID operation module, and the operation result output end of the power control operation module is output to the power controller.
2. The automated control system for a multi-stage series electric heating apparatus of claim 1, wherein: the electric heating unit has 4-8 stages.
3. A method of controlling a multi-stage series electric heating apparatus employing the automated control system for a multi-stage series electric heating apparatus as set forth in claim 1, characterized by: comprises the steps of,
A. Heating the medium flowing from the inlet to the outlet through a multi-stage electric heating unit, and performing over-temperature protection on the medium by an electric heater in each stage through a corresponding over-temperature protection module;
b. Calculating the difference value between the real-time monitoring temperature of each stage of electric heater and the overtemperature set value of the electric heater of the stage of electric heater in an overtemperature control PID operation module through a PID algorithm to obtain a power adjustment reference value, and outputting the power adjustment reference value to the power control operation module of the stage; the greater the difference, the lower the power adjustment reference indicates the adjusted power;
c. Calculating the difference value between the detected temperature of the outlet medium and the set value of the temperature of the outlet medium in an outlet control PID operation module through a PID algorithm to obtain another power adjustment reference value, and outputting the power adjustment reference value to the power control operation module of each stage; the greater the difference, the higher the power adjustment reference indicates the adjusted power;
d. In each stage of electric heating unit, the power adjustment reference values of the over-temperature control PID operation module and the outlet control PID operation module are subjected to superposition operation in the power control operation module, the operation result is output to the power controller, and the heating power of the stage of electric heater is adjusted through the power controller.
4. A control method of a multistage serial electric heating apparatus according to claim 3, characterized in that: in the step d, the power adjustment reference values from the over-temperature control PID operation module and the outlet control PID operation module are subjected to superposition operation according to the set weight values.
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| CN201811571645.5A CN109688638B (en) | 2018-12-21 | 2018-12-21 | Automatic control system and control method for multistage series electric heating device |
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| CN201811571645.5A CN109688638B (en) | 2018-12-21 | 2018-12-21 | Automatic control system and control method for multistage series electric heating device |
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| CN109688638B true CN109688638B (en) | 2024-06-18 |
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| CN112684772B (en) * | 2020-12-31 | 2024-05-03 | 贵阳振兴铝镁科技产业发展有限公司 | Heat balance control system and method for aluminum oxide dissolution |
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| CN107270548A (en) * | 2017-08-08 | 2017-10-20 | 广东万家乐燃气具有限公司 | Overtemperature prote control system and electric heater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11231946A (en) * | 1998-02-10 | 1999-08-27 | Komatsu Ltd | Temperature controller for multi-stage regenerator tank |
| JP2000335957A (en) * | 1999-05-28 | 2000-12-05 | Yukinori Hayashi | Division assembly type kiln |
| CN101634486B (en) * | 2009-08-28 | 2011-12-21 | 镇江东方电热有限公司(中外合资) | Electrical heater |
| CN103838188B (en) * | 2012-11-20 | 2016-12-21 | 中核建中核燃料元件有限公司 | UF6vaporization automatic control system and control method |
| CN103286929B (en) * | 2013-06-17 | 2015-08-05 | 王楠 | A kind of multi-way PID temperature control device and control method thereof |
| DE102014203657A1 (en) * | 2014-02-28 | 2015-09-03 | Siemens Aktiengesellschaft | Power module and interface module for a heating control and / or regulation as well as a modular system for heating control and / or regulation |
| CN105098709B (en) * | 2015-07-01 | 2018-05-08 | 新誉轨道交通科技有限公司 | The guard method of motor-car air-conditioning electrical heating overtemperature protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105807812A (en) * | 2014-12-30 | 2016-07-27 | 中核控制系统工程有限公司 | PID temperature control method and temperature control module |
| CN107270548A (en) * | 2017-08-08 | 2017-10-20 | 广东万家乐燃气具有限公司 | Overtemperature prote control system and electric heater |
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