CN113727480A - Control method and system for output power of electromagnetic heating controller of thermal desorption furnace - Google Patents
Control method and system for output power of electromagnetic heating controller of thermal desorption furnace Download PDFInfo
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- CN113727480A CN113727480A CN202010447709.1A CN202010447709A CN113727480A CN 113727480 A CN113727480 A CN 113727480A CN 202010447709 A CN202010447709 A CN 202010447709A CN 113727480 A CN113727480 A CN 113727480A
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- thermal desorption
- solid waste
- output power
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- oily solid
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- 238000003795 desorption Methods 0.000 title claims abstract description 144
- 238000010438 heat treatment Methods 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000002910 solid waste Substances 0.000 claims abstract description 111
- 230000008569 process Effects 0.000 claims abstract description 28
- 238000005520 cutting process Methods 0.000 claims description 18
- 238000010586 diagram Methods 0.000 claims description 12
- 239000010802 sludge Substances 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 4
- 239000003208 petroleum Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 description 9
- 238000005553 drilling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000630 rising 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
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
Abstract
The invention provides a method and a system for controlling the output power of an electromagnetic heating controller of a thermal desorption furnace, wherein the method comprises the following steps: (1) according to a thermal desorption field test of the oily solid waste, obtaining a linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste; (2) substituting the target load input quantity of the oily solid waste into the linear relational expression to obtain first output power of the electromagnetic heating controller of the thermal desorption furnace; (3) obtaining a second output power of the electromagnetic heating controller of the thermal desorption furnace according to the actual temperature of the oily solid waste in the thermal desorption process of the oily solid waste; (4) and taking the sum of the first output power of the thermal desorption furnace electromagnetic heating controller and the second output power of the thermal desorption furnace electromagnetic heating controller as the final output power of the thermal desorption furnace electromagnetic heating controller. The method and the system provided by the invention can ensure that the thermal desorption furnace can stably, reliably, safely and energy-saving operate.
Description
Technical Field
The invention relates to a method and a system for controlling the output power of an electromagnetic heating controller of a thermal desorption furnace, belonging to the technical field of electromagnetic heating type thermal desorption furnace control.
Background
The thermal desorption furnace is key equipment for treating the oily solid waste such as oil-based drill cuttings, and mainly has the functions of heating the furnace wall of the thermal desorption furnace through the electromagnetic heater, transferring heat to the oily solid waste through the furnace wall of the thermal desorption furnace, and volatilizing pollutants of the oily solid waste by heating the oily solid waste at a rising temperature so as to achieve the purpose of separating the pollutants from the drill cuttings. At present, the output power of an electromagnetic heater of the thermal desorption furnace is mainly controlled by the temperature of the furnace wall of the thermal desorption furnace. When the load of the oily solid waste input into the thermal desorption furnace is reduced and the temperature of the furnace wall of the thermal desorption furnace is increased, the output power of the electromagnetic heater is reduced; when the load of the oily solid waste input into the thermal desorption furnace is increased and the temperature of the furnace wall of the thermal desorption furnace is lowered, the output power of the electromagnetic heater is increased. However, the temperature change of the oily solid waste has certain hysteresis for the temperature change of the oven wall of the electromagnetic heating oven, and the change of the output power of the electromagnetic heater has certain hysteresis for the temperature change of the oven wall of the electromagnetic heating oven, so that the output power of the electromagnetic heater is not matched with the actual temperature of the oily solid waste, and long-time adjustment is needed for matching, thereby meeting the operation requirement.
Therefore, it has become an urgent technical problem in the art to provide a method for controlling the output power of an electromagnetic heating controller of a thermal desorption furnace.
Disclosure of Invention
In order to solve the above disadvantages and shortcomings, an object of the present invention is to provide a method for controlling the output power of an electromagnetic heating controller of a thermal desorption oven.
The invention also aims to provide a control system for the output power of the electromagnetic heating controller of the thermal desorption furnace. The invention enables the electromagnetic heating controller of the thermal desorption furnace to quickly find out the optimal output power according to the change of the load of the oily solid waste, and ensures that the heating temperature of the oily solid waste is not changed, so that the electromagnetic thermal desorption furnace can stably, reliably, safely and energy-saving operate.
In order to achieve the above object, in one aspect, the present invention provides a method for controlling output power of an electromagnetic heating controller of a thermal desorption furnace, wherein the method for controlling output power of the electromagnetic heating controller of the thermal desorption furnace comprises:
(1) according to a thermal desorption field test of the oily solid waste, obtaining a linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste;
(2) substituting the target load input quantity of the oily solid waste into the linear relational expression to obtain first output power of the electromagnetic heating controller of the thermal desorption furnace;
(3) obtaining a second output power of the electromagnetic heating controller of the thermal desorption furnace according to the actual temperature of the oily solid waste in the thermal desorption process of the oily solid waste;
(4) and taking the sum of the first output power of the thermal desorption furnace electromagnetic heating controller and the second output power of the thermal desorption furnace electromagnetic heating controller as the final output power of the thermal desorption furnace electromagnetic heating controller.
In the method described above, preferably, in step (1), the obtaining of the linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste during the thermal desorption process of the oily solid waste according to the thermal desorption field test of the oily solid waste comprises:
drawing a scatter diagram of the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste by taking the output power of a plurality of groups of electromagnetic heating controllers of the thermal desorption furnace obtained in the thermal desorption field test process of the oily solid waste as a vertical coordinate and the load input quantity of the corresponding oily solid waste as a horizontal coordinate;
performing linear fitting on the scatter diagram to obtain a linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste, and recording the linear relation as a formula 1):
y ═ aX + b, formula 1), Y is the output power of the thermal desorption oven electromagnetic heating controller, kW, X is the load input of the oily solid waste, kg/h, a, b are constants.
In the method described above, preferably, in the step (3), the second output power of the electromagnetic heating controller of the thermal desorption furnace is obtained by PID operation according to the actual temperature of the oily solid waste in the thermal desorption process of the oily solid waste.
In the method described above, preferably, in step (1), the obtaining of the linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste during the thermal desorption process of the oily solid waste according to the thermal desorption field test of the oily solid waste comprises:
drawing a scatter diagram of the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste by taking the output power of a plurality of groups of electromagnetic heating controllers of the thermal desorption furnace obtained in the thermal desorption field test process of the oily solid waste as a vertical coordinate and the load input quantity of the corresponding oily solid waste as a horizontal coordinate;
performing linear fitting on the scatter diagram to obtain a linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste, and recording the linear relation as a formula 1): y is aX + b, in formula 1), Y is the output power of the electromagnetic heating controller of the thermal desorption furnace, kW, X is the load input of the oily solid waste, kg/h, and a and b are constants;
and (3) obtaining second output power of the electromagnetic heating controller of the thermal desorption furnace through PID operation according to the actual temperature of the oily solid waste in the thermal desorption process of the oily solid waste.
In the above method, preferably, the oily solid waste includes oil-based drill cuttings, petroleum-contaminated soil, and oily sludge.
The method provided by the invention realizes the requirement that the output power of the electromagnetic heating controller quickly tracks the load change of the oily solid waste.
In another aspect, the present invention further provides a control system for output power of an electromagnetic heating controller of a thermal desorption oven, which is used for implementing the control method for output power of an electromagnetic heating controller of a thermal desorption oven, wherein the system comprises:
the device comprises a discharge valve, a PLC control system, a thermal desorption furnace electromagnetic heating controller and an oil-containing solid waste temperature transmitter;
the discharge valve is connected with the input end of the PLC control system through a signal line so as to transmit the load input data of the oily solid waste to the PLC control system, and the PLC control system calculates according to a formula 1) to obtain the first output power of the electromagnetic heating controller of the thermal desorption furnace;
the temperature transmitter of the oily solid waste is connected with the input end of the PLC control system through a signal wire so as to transmit actual temperature data of the oily solid waste to the PLC control system, and the PLC control system calculates to obtain second output power of the electromagnetic heating controller of the thermal desorption furnace and then sums the second output power with the first output power to obtain final output power of the electromagnetic heating controller of the thermal desorption furnace;
and the output end of the PLC control system is connected with the thermal desorption furnace electromagnetic heating controller through a signal wire so as to transmit the final output power to the thermal desorption furnace electromagnetic heating controller.
In the system described above, preferably, the discharge valve is a star-type discharge valve.
In the above system, preferably, the PLC control system is provided with a PID operator.
In the system described above, preferably, the discharge valve is a star-type discharge valve; the PLC control system is provided with a PID arithmetic unit.
In the system described above, preferably, the oily solid waste includes oil-based drill cuttings, petroleum-contaminated soil, and oily sludge.
In the system provided by the invention, the PLC control system receives data and signals from the discharge valve and the oily solid waste temperature transmitter, calculates the final power output value of the electromagnetic heating controller according to a set program and a set formula, and transmits the final power output value to the electromagnetic heating controller.
The electromagnetic heating controller is connected with the output end of the PLC control system through a signal wire and used for receiving data output by the PLC control system and controlling the output power of the electromagnetic heating controller.
In the system, the discharge valve, the PLC control system, the thermal desorption furnace electromagnetic heating controller, and the oily solid waste temperature transmitter (which is disposed on the thermal desorption furnace and used for monitoring the temperature of the oily solid waste in real time) are all conventional devices.
The technical scheme provided by the invention can achieve the following technical effects:
1. the system response is fast. The final output power of the electromagnetic heating controller directly changes along with the change of the oil-containing solid waste load, and the temperature steady state of the oil-based drilling cuttings is guaranteed to be unchanged.
2. The stability is good. The system provided by the invention adjusts the final output power of the electromagnetic heating controller according to two parameters, namely the load input quantity of the oily solid waste and the temperature of the oily solid waste, so that the stable operation of the electromagnetic heating desorption furnace is realized; and the operation of the electromagnetic heating desorption furnace cannot be influenced by the fault of any one process of the load input of the oily solid waste and the temperature control of the oily solid waste.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a control system of an output power of an electromagnetic heating controller of a thermal desorption furnace according to embodiment 1 of the present invention.
Fig. 2 is a process flow chart of a method for controlling the output power of the electromagnetic heating controller of the thermal desorption furnace according to embodiment 2 of the present invention.
Fig. 3 is a scatter diagram of the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input amount of the oily solid waste in embodiment 2 of the present invention.
The main reference numbers illustrate:
1. a star-shaped discharge valve;
2. a PLC control system;
3. a thermal desorption oven electromagnetic heating controller;
4. oily solid waste temperature transmitter.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
The embodiment provides a control system for output power of an electromagnetic heating controller of a thermal desorption furnace, which is shown in fig. 1, and as can be seen from fig. 1, the system comprises:
the device comprises a star-shaped discharge valve 1, a PLC control system 2, a thermal desorption furnace electromagnetic heating controller 3 and an oil-containing solid waste temperature transmitter 4;
the star-shaped discharge valve 1 is connected with the input end of the PLC control system 2 through a signal wire so as to transmit the load input data of the oily solid waste to the PLC control system 2 and calculate the first output power of the electromagnetic heating controller of the thermal desorption furnace according to the formula 1) by the PLC control system 2;
the oily solid waste temperature transmitter 3 is connected with the input end of the PLC control system 2 through a signal wire so as to transmit actual temperature data of the oily solid waste to the PLC control system 2, and after the second output power of the thermal desorption furnace electromagnetic heating controller is obtained through calculation by a PID arithmetic unit arranged in the PLC control system 2, the second output power is summed with the first output power to obtain the final output power of the thermal desorption furnace electromagnetic heating controller;
the output end of the PLC control system 2 is connected with the thermal desorption furnace electromagnetic heating controller 4 through a signal wire so as to transmit the final output power to the thermal desorption furnace electromagnetic heating controller 4.
Example 2
The present embodiment provides a method for controlling output power of an electromagnetic heating controller of a thermal desorption furnace, which is implemented by using the system for controlling output power of an electromagnetic heating controller of a thermal desorption furnace provided in embodiment 1, and a process flow chart of the control method is shown in fig. 2, and as can be seen from fig. 2, the method includes the following steps:
s1: a plurality of groups of thermal desorption furnaces (3T/h electromagnetic heating type thermal desorption furnaces developed by China Petroleum safety and environmental protection institute) output power of electromagnetic heating controllers and corresponding oil-based drill cuttings load input quantity are obtained through oil-based drill cuttings thermal desorption field test tests, and experimental data in the embodiment are shown in the following table 1;
by taking the output power of a plurality of groups of thermal desorption furnace electromagnetic heating controllers obtained in the thermal desorption field test process of the oil-based drilling cuttings as a vertical coordinate and the corresponding load input quantity of the oil-based drilling cuttings as a horizontal coordinate, drawing a scatter diagram of the output power of the thermal desorption furnace electromagnetic heating controllers and the load input quantity of the oil-containing solid wastes, as shown in fig. 3;
TABLE 1
Performing linear fitting on the scatter diagram to obtain a linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste, and recording the linear relation as a formula 1): y is 0.2X +13, and in formula 1), Y is the output power of the electromagnetic heating controller of the thermal desorption furnace, kW, and X is the load input of the oily solid waste, kg/h;
s2: the star-shaped discharge valve and the oily solid waste temperature transmitter respectively detect an oil-based drill chip load input value and an oil-based drill chip actual temperature, and transmit the oil-based drill chip load input value and the oil-based drill chip actual temperature to the PLC control system by standard 4-20mA analog quantity signals, the PLC control system respectively brings the oil-based drill chip load input value and the oil-based drill chip actual temperature value into the PID arithmetic units of the linear relation and the PLC control system, a first output power Y1 of the thermal desorption furnace electromagnetic heating controller and a second output power Y2 of the thermal desorption furnace electromagnetic heating controller are obtained through calculation, and the Y1 and the Y2 are summed to obtain the final output power of the thermal desorption furnace electromagnetic heating controller;
in this embodiment, for example, the instantaneous load input value of the oil-based drill cuttings detected by the star discharge valve and the oily solid waste temperature transmitter is 100kg/h, the actual temperature of the oil-based drill cuttings is 345 ℃, the star discharge valve and the oily solid waste temperature transmitter transmit the two data to the PLC control system respectively by using standard 4-20mA analog quantity signals, the PLC control system then brings the load input value of the oil-based drill cuttings and the actual temperature value of the oil-based drill cuttings into the above linear relational expression and the PID arithmetic unit of the PLC control system respectively, and calculates to obtain the first output power Y1 of the electromagnetic heating controller of the thermal desorption furnace and the second output power Y2 of the electromagnetic heating controller of the thermal desorption furnace to be 3.3kW, and sums Y1 and Y2 to obtain the final output power Y of the electromagnetic heating controller of the thermal desorption furnace, which is 36.3 kW;
s3: the PLC control system converts the final output power value into a standard 4-20mA analog quantity signal and outputs the signal to the electromagnetic heating controller, so that the load change of the oil-based drilling cuttings is quickly tracked, and the heating temperature of the oil-based drilling cuttings is kept constant at 350 ℃.
The technical scheme provided by the embodiment of the invention can achieve the following technical effects:
1. the system response is fast. The final output power of the electromagnetic heating controller directly changes along with the change of the oil-containing solid waste load, and the temperature steady state of the oil-based drilling cuttings is guaranteed to be unchanged.
2. The stability is good. The system provided by the invention adjusts the final output power of the electromagnetic heating controller according to two parameters, namely the load input quantity of the oily solid waste and the temperature of the oily solid waste, so that the stable operation of the electromagnetic heating desorption furnace is realized; and the operation of the electromagnetic heating desorption furnace cannot be influenced by the fault of any one process of the load input of the oily solid waste and the temperature control of the oily solid waste.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (10)
1. A control method for the output power of an electromagnetic heating controller of a thermal desorption furnace is characterized by comprising the following steps:
(1) according to a thermal desorption field test of the oily solid waste, obtaining a linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste;
(2) substituting the target load input quantity of the oily solid waste into the linear relational expression to obtain first output power of the electromagnetic heating controller of the thermal desorption furnace;
(3) obtaining a second output power of the electromagnetic heating controller of the thermal desorption furnace according to the actual temperature of the oily solid waste in the thermal desorption process of the oily solid waste;
(4) and taking the sum of the first output power of the thermal desorption furnace electromagnetic heating controller and the second output power of the thermal desorption furnace electromagnetic heating controller as the final output power of the thermal desorption furnace electromagnetic heating controller.
2. The method according to claim 1, wherein in the step (1), the linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste is obtained according to the thermal desorption field test of the oily solid waste, and the linear relation comprises the following steps:
drawing a scatter diagram of the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste by taking the output power of a plurality of groups of electromagnetic heating controllers of the thermal desorption furnace obtained in the thermal desorption field test process of the oily solid waste as a vertical coordinate and the load input quantity of the corresponding oily solid waste as a horizontal coordinate;
performing linear fitting on the scatter diagram to obtain a linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste, and recording the linear relation as a formula 1): y ═ aX + b, formula 1), Y is the output power of the thermal desorption oven electromagnetic heating controller, kW, X is the load input of the oily solid waste, kg/h, a, b are constants.
3. The method according to claim 1, wherein in the step (3), the second output power of the electromagnetic heating controller of the thermal desorption furnace is obtained by PID operation according to the actual temperature of the oily solid waste in the thermal desorption process of the oily solid waste.
4. The method according to claim 1, wherein in the step (1), the linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste is obtained according to the thermal desorption field test of the oily solid waste, and the linear relation comprises the following steps:
drawing a scatter diagram of the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste by taking the output power of a plurality of groups of electromagnetic heating controllers of the thermal desorption furnace obtained in the thermal desorption field test process of the oily solid waste as a vertical coordinate and the load input quantity of the corresponding oily solid waste as a horizontal coordinate;
performing linear fitting on the scatter diagram to obtain a linear relation between the output power of the electromagnetic heating controller of the thermal desorption furnace and the load input quantity of the oily solid waste in the thermal desorption process of the oily solid waste, and recording the linear relation as a formula 1): y is aX + b, in formula 1), Y is the output power of the electromagnetic heating controller of the thermal desorption furnace, kW, X is the load input of the oily solid waste, kg/h, and a and b are constants;
and (3) obtaining second output power of the electromagnetic heating controller of the thermal desorption furnace through PID operation according to the actual temperature of the oily solid waste in the thermal desorption process of the oily solid waste.
5. The method of any one of claims 1-4, wherein the oily solid waste comprises oil-based drill cuttings, petroleum contaminated soil, and oily sludge.
6. A control system of output power of an electromagnetic heating controller of a thermal desorption oven for realizing the control method of the output power of the electromagnetic heating controller of the thermal desorption oven according to any one of claims 1 to 5, which is characterized by comprising:
the device comprises a discharge valve, a PLC control system, a thermal desorption furnace electromagnetic heating controller and an oil-containing solid waste temperature transmitter;
the discharge valve is connected with the input end of the PLC control system through a signal line so as to transmit the load input data of the oily solid waste to the PLC control system, and the PLC control system calculates according to a formula 1) to obtain the first output power of the electromagnetic heating controller of the thermal desorption furnace;
the temperature transmitter of the oily solid waste is connected with the input end of the PLC control system through a signal wire so as to transmit actual temperature data of the oily solid waste to the PLC control system, and the PLC control system calculates to obtain second output power of the electromagnetic heating controller of the thermal desorption furnace and then sums the second output power with the first output power to obtain final output power of the electromagnetic heating controller of the thermal desorption furnace;
and the output end of the PLC control system is connected with the thermal desorption furnace electromagnetic heating controller through a signal wire so as to transmit the final output power to the thermal desorption furnace electromagnetic heating controller.
7. The system of claim 6, wherein the discharge valve is a star-type discharge valve.
8. The system of claim 6, wherein the PLC control system is provided with a PID operator.
9. The system of claim 6, wherein the discharge valve is a star-type discharge valve; the PLC control system is provided with a PID arithmetic unit.
10. The system of any one of claims 6-9, wherein the oily solid waste comprises oil-based drill cuttings, petroleum contaminated soil, and oily sludge.
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| CN105547704A (en) * | 2016-01-13 | 2016-05-04 | 中国航空动力机械研究所 | Aero-engine fuel oil heating test method and test device |
| CN207738704U (en) * | 2017-12-22 | 2018-08-17 | 中海油能源发展股份有限公司 | Equipment is desorbed in a kind of electromagnetic heating sea oil-containing, hydrocarbon contamination castoff heat |
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- 2020-05-25 CN CN202010447709.1A patent/CN113727480A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06330276A (en) * | 1993-05-17 | 1994-11-29 | Nkk Corp | Method for controlling degree of alloying of hot dip metal coated steel sheet in induction heating type alloying furnace |
| US5597501A (en) * | 1994-11-03 | 1997-01-28 | United States Department Of Energy | Precision control of high temperature furnaces using an auxiliary power supply and charged practice current flow |
| KR20020048087A (en) * | 2000-12-16 | 2002-06-22 | 이구택 | edge heater auto control apparatus using Fe induction pating line |
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