CN113588711B - Calculation device and calculation method for severe thermal decomposition area of gas insulation medium - Google Patents
Calculation device and calculation method for severe thermal decomposition area of gas insulation medium Download PDFInfo
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- CN113588711B CN113588711B CN202110705184.1A CN202110705184A CN113588711B CN 113588711 B CN113588711 B CN 113588711B CN 202110705184 A CN202110705184 A CN 202110705184A CN 113588711 B CN113588711 B CN 113588711B
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- 238000005979 thermal decomposition reaction Methods 0.000 title claims abstract description 79
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Abstract
The invention discloses a device and a method for calculating a severe thermal decomposition area of a gas insulation medium, wherein the device comprises the following steps: the multi-port temperature controller, the heater, the first temperature sensor, the second temperature sensor, the third temperature sensor, the tank body and the air valve port; simulating the temperature rise in the electric insulation equipment through a heater, simultaneously monitoring the temperatures of a first temperature sensor, a second temperature sensor and a third temperature sensor through a multi-port temperature controller, obtaining the critical decomposition temperature of a gas insulation medium by solving the heat conductivity of the gas insulation medium, and calculating a preliminary boundary line of a severe thermal decomposition area; and moving the second temperature sensor, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, determining the severe thermal decomposition area, facilitating the detection and protection of abnormal temperature rise of the insulating equipment, and reducing damage and safety accidents of the insulating equipment of the electric appliance.
Description
Technical Field
The invention relates to the technical field of electrical insulation, in particular to a calculation device and a calculation method for a severe thermal decomposition area of a gas insulation medium.
Background
Nowadays, many gas insulation media are applied to electrical insulation equipment on a large scale, the electrical insulation equipment has working temperature rise generated by the heat effect of current flowing through a conductor of the electrical insulation equipment and fault temperature rise caused by aging and poor contact at the connecting point of the electrical insulation equipment, the conditions can cause the gas insulation media of the electrical insulation equipment to generate huge temperature rise, the temperature rise can cause the gas insulation media to generate decomposition, and therefore the insulation capability of the electrical insulation equipment is reduced, and the equipment or even the personal safety is damaged when the temperature rise is serious.
Disclosure of Invention
In view of the above-mentioned drawbacks, embodiments of the present invention provide a device and a method for calculating a severe thermal decomposition area of a gas insulation medium, which can calculate an area where the gas insulation medium is severely decomposed.
An embodiment of the present invention provides a device for calculating a severe thermal decomposition area of a gas insulation medium, the device comprising: the multi-port temperature controller, the heater, the first temperature sensor, the second temperature sensor, the third temperature sensor, the tank body and the air valve port;
the heater is arranged in the tank body;
the first temperature sensor is arranged on the inner wall of the tank body;
the second temperature sensor is arranged inside the tank body;
the third temperature sensor is mounted on the heater;
the first temperature sensor, the second temperature sensor and the third temperature sensor are all connected with the multi-port temperature controller;
the air valve port is arranged on the tank body.
Preferably, the heater is movable in position within the tank by a first movement connecting means.
Preferably, the second temperature sensor is movable in position within the tank by a second movement connection means.
Preferably, the apparatus further comprises a relay, and the heater is connected to an ac power supply via the relay.
As a preferable mode, the device further comprises a barometer, and the barometer is communicated with the tank body and used for detecting the air pressure in the tank body.
The embodiment of the invention provides a device for calculating a severe thermal decomposition area of a gas insulating medium, which comprises: the multi-port temperature controller, the heater, the first temperature sensor, the second temperature sensor, the third temperature sensor, the tank body and the air valve port; through the inside temperature rise of heater simulation electrical insulation equipment, through the temperature of first temperature sensor, second temperature sensor and third temperature sensor of multiport temperature controller simultaneous monitoring, through solving the thermal conductivity of gas insulation medium, acquire the critical decomposition temperature of gas insulation medium can calculate serious pyrolysis region, through calculating the serious pyrolysis region of the internal portion of electrical insulation equipment jar, is convenient for realize the detection and the protection to the abnormal temperature rise of insulating equipment, reduces electrical insulation equipment's damage and incident.
Another embodiment of the present invention also provides a method for calculating a severe thermal decomposition area of a gas insulation medium, the method using the apparatus for calculating a severe thermal decomposition area of a gas insulation medium according to any one of the above embodiments, the method including:
filling a gas insulation medium with a preset air pressure value into the tank body;
adjusting a heater to a heating position to be calculated, and starting the heater;
calculating the thermal conductivity of an insulating gas medium, acquiring the critical decomposition temperature of the gas insulating medium, and estimating a preliminary boundary line of a severe thermal decomposition region according to the thermal conductivity and the critical decomposition temperature;
and moving the second temperature sensor, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area.
Preferably, the calculating the thermal conductivity of the insulating gas medium, obtaining the critical decomposition temperature of the gas insulating medium, and estimating the preliminary boundary line of the severe thermal decomposition region from the thermal conductivity and the critical decomposition temperature specifically comprises:
when the temperature of the third temperature sensor is higher than the critical decomposition temperature, the temperature of the first temperature sensor is not higher than the critical decomposition temperature, and the power of the heater is adjusted to be P, keeping the temperature of the third temperature sensor and the temperature of the first temperature sensor unchanged;
acquiring the distance x between the first temperature sensor and the third temperature sensor and the temperature T of the first temperature sensor 1 And the temperature T of the third temperature sensor 2 Calculating the thermal conductivity
Obtaining the critical decomposition temperature T of the gas insulation medium by inquiry 0 ；
According to the thermal conductivity lambda and the critical decomposition temperature T 0 And the temperature T of the third temperature sensor 2 Estimating boundary line distance
By a distance x from the edge of the heater 0 The preliminary boundary line of the severe thermal decomposition region is confirmed.
Preferably, the moving the second temperature sensor, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area specifically includes:
determining all correction points on the preliminary boundary line according to the preliminary boundary line and preset boundary line precision;
moving the second temperature sensor to a correction point of any one of the preliminary boundary line positions, detecting the temperature of the correction point, and judging whether the temperature of the correction point is equal to the critical decomposition temperature or not;
if the temperature of the correction point is equal to the critical decomposition temperature, marking the correction point as an accurate point; if the temperature of the correction point is not equal to the critical decomposition temperature, moving the second temperature sensor close to or away from the heater until the temperature of the second temperature sensor is equal to the critical decomposition temperature, and determining the point as an accurate point;
moving the second temperature sensor to a next correction point, detecting the temperature of the correction point, and determining whether the corrected temperature is equal to the critical decomposition temperature again; until finishing correcting all correction points;
and connecting the accurate points to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area.
The invention discloses a device and a method for calculating a severe thermal decomposition area of a gas insulation medium, wherein the device comprises the following steps: the multi-port temperature controller, the heater, the first temperature sensor, the second temperature sensor, the third temperature sensor, the tank body and the air valve port; simulating the temperature rise in the electric insulation equipment through a heater, simultaneously monitoring the temperatures of a first temperature sensor, a second temperature sensor and a third temperature sensor through a multi-port temperature controller, obtaining the critical decomposition temperature of a gas insulation medium by solving the heat conductivity of the gas insulation medium, and calculating a preliminary boundary line of a severe thermal decomposition area; and moving the second temperature sensor, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, determining the severe thermal decomposition area, facilitating the detection and protection of abnormal temperature rise of the insulating equipment, and reducing damage and safety accidents of the insulating equipment of the electric appliance.
Drawings
FIG. 1 is a schematic structural diagram of a computing device with a severe thermal decomposition area for a gas insulation medium according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a method for calculating a severe thermal decomposition area of a gas insulation medium according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
An embodiment of the present invention provides a calculation apparatus for severe thermal decomposition area of gas insulation medium, and referring to fig. 1, the calculation apparatus for severe thermal decomposition area of gas insulation medium according to an embodiment of the present invention is schematically configured, and includes: the temperature control device comprises a multi-port temperature controller 2, a heater 5, a first temperature sensor 6, a second temperature sensor 7, a third temperature sensor 8, a tank body 9 and a gas valve port 10;
the heater 5 is arranged inside the tank body 9;
the first temperature sensor 6 is arranged on the inner wall of the tank body 9;
the second temperature sensor 7 is arranged inside the tank body 9;
the third temperature sensor 8 is mounted on the heater 5;
the first temperature sensor 6, the second temperature sensor 7 and the third temperature sensor 8 are all connected with the multi-port temperature controller 2;
the air valve port 10 is installed on the tank body 9.
In the specific implementation of this embodiment, the multi-port thermostat 2 is connected to the first temperature sensor 6, the second temperature sensor 7 and the third temperature sensor 8, and can monitor the temperatures of the three temperature sensors at the same time; the air valve port 10 is used for charging and discharging air insulation medium into the tank body; the heater is used for simulating the temperature rise in the electric insulation equipment;
the critical decomposition temperature of the gas insulation medium is obtained by solving the thermal conductivity of the gas insulation medium, and then a severe thermal decomposition area can be calculated;
the embodiment of the invention provides a calculation device for a severe thermal decomposition area of a gas insulation medium, which comprises: the multi-port temperature controller, the heater, the first temperature sensor, the second temperature sensor, the third temperature sensor, the tank body and the air valve port; through the inside temperature rise of heater simulation electrical insulation equipment, through the temperature of first temperature sensor, second temperature sensor and third temperature sensor of multiport temperature controller simultaneous monitoring, through solving the thermal conductivity of gas insulation medium, acquire the critical decomposition temperature of gas insulation medium can calculate serious pyrolysis region, through calculating the serious pyrolysis region of the internal portion of electrical insulation equipment jar, is convenient for realize the detection and the protection to the abnormal temperature rise of insulating equipment, reduces electrical insulation equipment's damage and incident.
In still another embodiment of the present invention, the heater is movable in position within the tank by a first moving connection unit.
In the specific implementation of the embodiment, referring to fig. 1, the heater 5 is connected to the first movable connecting unit 11, and the first movable connecting unit 11 can control the heater 5 to move in the tank 9;
abnormal temperature rises of different positions of the electric insulation equipment can be simulated by moving the heater, and then severe thermal decomposition areas of the electric insulation equipment with faults at different positions can be calculated.
In still another embodiment of the present invention, the second temperature sensor is movable in position within the tank body by a second movable connection unit.
In the specific implementation of the present embodiment, referring to fig. 1, the second temperature sensor 7 is connected to the second movable connection unit 12, and the second movable connection unit 12 can control the second temperature sensor 7 to move in the tank 9;
the temperature of any position of the tank body of the electrical insulation equipment can be detected by moving the second temperature sensor, and the correction of the severe thermal decomposition area of the electrical insulation equipment is realized.
In yet another embodiment provided by the present invention, the apparatus further comprises a relay through which the heater is connected to an ac power source.
In the specific implementation of the embodiment, referring to fig. 1, the heater 5 is connected to the 200V ac power supply 1 through the relay 3, and the relay 3 is further connected to the multiport thermostat 2;
the temperature in the tank body is detected through the multi-port temperature controller, and the relay 1 is controlled, so that the on-off and power control of the heater can be realized, and the simulation of thermal faults is convenient to realize.
In another embodiment of the present invention, the apparatus further includes a barometer, which is in communication with the tank and is configured to detect the air pressure inside the tank.
In the specific implementation of this embodiment, as shown in fig. 1, the apparatus further includes a barometer 4, where the barometer 4 is communicated with the tank 9, and is configured to detect the air pressure inside the tank, so as to prevent the air pressure of the gas insulation medium from exceeding a rated value of the tank during the heating process, improve the safety performance of the apparatus, and simultaneously monitor whether the tank has faults such as air leakage.
The embodiment of the invention provides a device for calculating a severe thermal decomposition area of a gas insulating medium, which comprises: the temperature control device comprises a multi-port temperature controller, a heater, a first temperature sensor, a second temperature sensor, a third temperature sensor, a tank body and an air valve port; through the inside temperature rise of heater simulation electrical insulation equipment, through the temperature of first temperature sensor, second temperature sensor and third temperature sensor of multiport temperature controller simultaneous monitoring, through solving the thermal conductivity of gas insulation medium, acquire the critical decomposition temperature of gas insulation medium can calculate serious pyrolysis region, through calculating the serious pyrolysis region of the internal portion of electrical insulation equipment jar, is convenient for realize the detection and the protection to the abnormal temperature rise of insulating equipment, reduces electrical insulation equipment's damage and incident.
An embodiment of the present invention further provides a method for calculating a severe thermal decomposition area of a gas insulation medium, where the method employs the apparatus for calculating a severe thermal decomposition area of a gas insulation medium according to any of the above embodiments, and the method includes: steps S201 to S204;
s201, filling a gas insulation medium with a preset air pressure value into the tank body;
s202, adjusting the heater to a heating position to be calculated, and starting the heater;
s203, calculating the thermal conductivity of the insulating gas medium, acquiring the critical decomposition temperature of the gas insulating medium, and estimating a preliminary boundary line of a severe thermal decomposition region according to the thermal conductivity and the critical decomposition temperature;
and S204, moving the second temperature sensor, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area.
When the embodiment is implemented, a gas insulation medium is filled into the tank body through the gas valve port, and the air pressure value is detected through the barometer until the air pressure value reaches a preset air pressure value which is lower than the rated air pressure of the tank body;
the heater is adjusted to a heating position to be calculated through the first movable connecting unit, the relay is closed, the heater is started to heat, the specific position with the heating position to be calculated is confirmed according to the position where abnormal temperature rise is prone to occurring in the electrical insulation equipment tank body, and the position with serious temperature rise is calculated preferentially.
Calculating the thermal conductivity of an insulating gas medium through the temperature detected by a temperature sensor, acquiring the critical decomposition temperature of the gas insulating medium, and estimating a preliminary boundary line of a severe thermal decomposition region through the thermal conductivity and the critical decomposition temperature;
and moving the second temperature sensor through the second moving and connecting unit, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area.
According to the calculation method for the severe thermal decomposition area of the gas insulation medium, provided by the embodiment of the invention, the temperature is detected through a temperature sensor, the thermal conductivity of the insulation gas medium is calculated, the critical decomposition temperature of the gas insulation medium is obtained, and the preliminary boundary line of the severe thermal decomposition area is estimated through the thermal conductivity and the critical decomposition temperature; and moving the second temperature sensor, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, determining the severe thermal decomposition area, calculating the severe thermal decomposition area more accurately, and reducing the calculation error of the severe thermal decomposition area caused by other factors in the tank body.
In another embodiment of the present invention, the step S203 specifically includes:
when the temperature of the third temperature sensor is higher than the critical decomposition temperature, the temperature of the first temperature sensor is not higher than the critical decomposition temperature, and the power of the heater is adjusted to be P, the temperature of the third temperature sensor and the temperature of the first temperature sensor are kept unchanged;
acquiring the distance x between the first temperature sensor and the third temperature sensor and the temperature T of the first temperature sensor 1 And the temperature T of the third temperature sensor 2 ；
Calculating thermal conductivity
Wherein, P is the preset power of the heater;
obtaining the critical decomposition temperature T of the gas insulation medium by inquiry 0 ；
According to the thermal conductivity lambda and the critical decomposition temperature T 0 And the temperature T of the third temperature sensor 2 Estimating boundary line distance
With a distance x from the edge of the heater 0 The preliminary boundary line of the severe thermal decomposition region is confirmed.
In the specific implementation of this embodiment, the distance x between the first temperature sensor and the third temperature sensor, and the temperature T of the first temperature sensor are obtained 1 And the temperature T of the third temperature sensor 2 (ii) a Temperature is in kelvin units and distance is in meters; calculating thermal conductivity
Obtaining the critical decomposition temperature T of the gas insulating medium by inquiry 0 ；
According to the thermal conductivity lambda and the critical decomposition temperature T 0 And the temperature T of the third temperature sensor 2 Estimating boundary line distance
With a distance x from the edge of the heater 0 Confirming a preliminary boundary line of the severe thermal decomposition region;
when specifically confirming preliminary boundary line, according to the shape difference of heater, the shape of preliminary boundary line also can change, compare with the jar body when the size of heater, can arrive approximately as an one point, preliminary boundary line is for using the heater as the centre of sphere, with distance x 0 A sphere of radius;
when the heater is cylindrical, the preliminary boundary line is a distance x two times greater than both the diameter and height of the heater 0 A cylinder of (2).
The preliminary boundary line is obtained by calculating the thermal conductivity and the critical decomposition temperature point.
In another embodiment provided by the present invention, the step S204 specifically includes:
determining all correction points on the preliminary boundary line according to the preliminary boundary line and preset boundary line precision;
moving the second temperature sensor to a correction point of any one of the preliminary boundary line positions, detecting the temperature of the correction point, and judging whether the temperature of the correction point is equal to the critical decomposition temperature or not;
if the temperature of the correction point is equal to the critical decomposition temperature, marking the correction point as an accurate point; if the temperature of the correction point is not equal to the critical decomposition temperature, moving the second temperature sensor close to or away from the heater until the temperature of the second temperature sensor is equal to the critical decomposition temperature, and determining the point as an accurate point;
moving the second temperature sensor to a next correction point, detecting the temperature of the correction point, and determining whether the corrected temperature is equal to the critical decomposition temperature again; until finishing the correction of all correction points;
and connecting the accurate points to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area.
In the specific implementation of the embodiment, according to the preliminary boundary line, the distance may be an accurate distance according to the preset boundary line precision L, and in the specific implementation of the embodiment, the distance may be L =3cm, and all the correction points are determined on the preliminary boundary line according to L, and the distances between all the correction points are L;
moving the second temperature sensor to a correction point of any one of the preliminary boundary line positions, recording the correction point as an initial correction point, detecting the temperature of the correction point, and judging whether the temperature of the correction point is equal to the critical decomposition temperature or not;
if the temperature of the correction point is equal to the critical decomposition temperature, marking the correction point as an accurate point;
when the temperature of the correction point is higher than the critical decomposition temperature, adjusting a second temperature sensor to be far away from the heater until the temperature of the second temperature sensor is equal to the critical decomposition temperature, and determining the point as an accurate point; when the temperature of the correction point is lower than the critical decomposition temperature, adjusting a second temperature sensor to be close to the heater until the temperature of the second temperature sensor is equal to the critical decomposition temperature, and determining the point as an accurate point;
moving the second temperature sensor to a next correction point, detecting the temperature of the correction point, and determining whether the corrected temperature is equal to the critical decomposition temperature again; until finishing the correction of all correction points;
and connecting the accurate points to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area.
And detecting the temperature on the initial boundary line by moving the second temperature sensor, and correcting the correction point by moving the second temperature sensor when the temperature on the initial boundary line is not equal to the critical decomposition temperature, so as to realize the determination of the accurate boundary line of the severe thermal decomposition area.
The invention provides a device and a method for calculating a severe thermal decomposition area of a gas insulating medium, wherein the device comprises: the temperature control device comprises a multi-port temperature controller, a heater, a first temperature sensor, a second temperature sensor, a third temperature sensor, a tank body and an air valve port; through the inside temperature rise of heater simulation electrical insulation equipment, through the temperature of first temperature sensor, second temperature sensor and third temperature sensor of multiport temperature controller simultaneous monitoring, through solving the thermal conductivity of gas insulation medium, acquire the critical decomposition temperature of gas insulation medium can calculate serious pyrolysis region, through calculating the serious pyrolysis region of the internal portion of electrical insulation equipment jar, is convenient for realize the detection and the protection to the abnormal temperature rise of insulating equipment, reduces electrical insulation equipment's damage and incident. The method comprises the steps of detecting temperature through a temperature sensor, calculating the thermal conductivity of an insulating gas medium, obtaining the critical decomposition temperature of the gas insulating medium, and estimating a preliminary boundary line of a severe thermal decomposition area through the thermal conductivity and the critical decomposition temperature; and moving the second temperature sensor, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, determining the severe thermal decomposition area, calculating the severe thermal decomposition area more accurately, and reducing the calculation error of the severe thermal decomposition area caused by other factors in the tank body.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A gas-insulated medium severe thermal decomposition zone calculation apparatus, the apparatus comprising: the multi-port temperature controller, the heater, the first temperature sensor, the second temperature sensor, the third temperature sensor, the tank body and the air valve port;
the heater is arranged in the tank body;
the first temperature sensor is arranged on the inner wall of the tank body;
the second temperature sensor is arranged in the tank body;
the third temperature sensor is mounted on the heater;
the first temperature sensor, the second temperature sensor and the third temperature sensor are all connected with the multi-port temperature controller;
the air valve port is arranged on the tank body;
simulating abnormal temperature rises of different positions of the electrical insulation equipment by moving the heater, and calculating severe thermal decomposition areas of the electrical insulation equipment with faults at different positions;
and the temperature of any position of the tank body of the electrical insulation equipment is detected by moving the second temperature sensor, so that the correction of the severe thermal decomposition area of the electrical insulation equipment is realized.
2. The apparatus for calculating severe thermal decomposition area of gas insulating medium according to claim 1, wherein said heater is movable in position within said tank by a first moving connection unit.
3. The apparatus for calculating severe thermal decomposition area of gas insulating medium according to claim 1, wherein said second temperature sensor is movable in position within said tank body by a second movable connection unit.
4. The apparatus for calculating severe thermal decomposition area of gas insulating medium of claim 1, wherein said apparatus further comprises a relay through which said heater is connected to an ac power source.
5. The apparatus for calculating severe thermal decomposition area of gas insulating medium according to claim 1, further comprising a gas pressure gauge in communication with the tank for detecting the gas pressure inside the tank.
6. A method for calculating a severe thermal decomposition area of a gas insulating medium, using the apparatus for calculating a severe thermal decomposition area of a gas insulating medium according to any one of claims 1 to 5, the method comprising:
filling a gas insulation medium with a preset air pressure value into the tank body;
adjusting a heater to a heating position to be calculated, and starting the heater;
calculating the thermal conductivity of an insulating gas medium, acquiring the critical decomposition temperature of the gas insulating medium, and estimating a preliminary boundary line of a severe thermal decomposition region according to the thermal conductivity and the critical decomposition temperature;
and moving the second temperature sensor, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area.
7. The method according to claim 6, wherein the calculating of the thermal conductivity of the insulating gas medium, the obtaining of the critical decomposition temperature of the gas insulating medium, and the estimating of the preliminary boundary line of the severe thermal decomposition region from the thermal conductivity and the critical decomposition temperature comprise:
when the temperature of the third temperature sensor is higher than the critical decomposition temperature, the temperature of the first temperature sensor is not higher than the critical decomposition temperature, and the power of the heater is adjusted to be P, the temperature of the third temperature sensor and the temperature of the first temperature sensor are kept unchanged;
acquiring the distance x between the first temperature sensor and the third temperature sensor and the temperature T of the first temperature sensor 1 And the temperature T of the third temperature sensor 2 Calculating the thermal conductivity
Obtaining the critical decomposition temperature T of the gas insulation medium by inquiry 0 ；
According to the thermal conductivity lambda and the critical decomposition temperature T 0 And the temperature T of the third temperature sensor 2 Estimating boundary line distance
By a distance x from the edge of the heater 0 The preliminary boundary line of the severe thermal decomposition region is confirmed.
8. The method according to claim 6, wherein the moving the second temperature sensor, correcting the preliminary boundary line to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area comprises:
determining all correction points on the preliminary boundary line according to the preliminary boundary line and preset boundary line precision;
moving the second temperature sensor to a correction point of any one of the preliminary boundary line positions, detecting the temperature of the correction point, and judging whether the temperature of the correction point is equal to the critical decomposition temperature or not;
if the temperature of the correction point is equal to the critical decomposition temperature, marking the correction point as an accurate point; if the temperature of the correction point is not equal to the critical decomposition temperature, moving the second temperature sensor close to or away from the heater until the temperature of the second temperature sensor is equal to the critical decomposition temperature, and determining the point as an accurate point;
moving the second temperature sensor to a next calibration point, detecting the temperature of the calibration point, and determining whether the calibrated temperature is equal to the critical decomposition temperature again; until finishing the correction of all correction points;
and connecting the accurate points to obtain an accurate boundary line of the severe thermal decomposition area, and determining the severe thermal decomposition area.
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