CN109871052A - A kind of electrothermal radiation tube temperature control equipment and its control method - Google Patents
A kind of electrothermal radiation tube temperature control equipment and its control method Download PDFInfo
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- CN109871052A CN109871052A CN201910264271.0A CN201910264271A CN109871052A CN 109871052 A CN109871052 A CN 109871052A CN 201910264271 A CN201910264271 A CN 201910264271A CN 109871052 A CN109871052 A CN 109871052A
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- radiation tube
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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
- G05D23/27—Control of temperature characterised by the use of electric means with sensing element responsive to radiation
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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
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
- G05D23/32—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature with provision for adjustment of the effect of the auxiliary heating device, e.g. a function of time
Abstract
The invention discloses a kind of electrothermal radiation tube temperature control equipment and its control method, which includes at least one electrothermal radiation tube protruded into inside heat-treatment furnace for heat dissipation, further includes: one is set to the first thermocouple inside electrothermal radiation tube；One is embedded at the second thermocouple of electric radiation tube wall；And one be set to heat-treatment furnace workspace third thermocouple；First thermocouple, the second thermocouple and third thermocouple are electrically connected temperature controller, and temperature controller controls the opening and closing of electrothermal radiation tube power supply by pid algorithm, to be precisely controlled to each phase temperature of heat-treatment furnace according to the temperature of each thermocouple monitoring.Temperature control equipment provided by the invention utilizes the structure of radiant tube self-heating, reduces the heat transfer link and thermal resistance of radiant tube, improves heating efficiency and rate, extends the service life；And temprature control method of the present invention is used, it can guarantee the stability, uniformity, accuracy and sensitivity for measuring furnace temperature signal.
Description
Technical field
The present invention relates to temperature regulating devices when a kind of heating heat-treatment equipment, more particularly, to a kind of electrothermal radiation tube temperature control
Device processed and its control method.
Background technique
In metal heat treatmet field, more and more extensive answer is had been obtained using the method that radiant tube carries out indirect heating
With.Existing heat-treatment furnace stove temp-controled mode is that the temperature signal measured by the thermocouple of workspace is controlled
, this temperature control method is the problem is that the change in location of thermocouple insertion and the flowing of furnace gas change the temperature to measurement
Degree signal has a great impact, and causes fluctuation, inaccuracy and lag of temperature signal etc..Therefore, it is lacked in the prior art
It falls into and develops that a kind of temperature control response is fast, control temperature of heat treatment furnace control device with high accuracy is very necessary.
Summary of the invention
The present invention is to solve big temperature fluctuation range in existing temperature of heat treatment furnace measurement process, inaccuracy and lag etc.
Problem proposes a kind of electrothermal radiation tube temperature control equipment and its control method.
To achieve the above object, the invention adopts the following technical scheme:
The first aspect of the invention is to provide a kind of electrothermal radiation tube temperature control equipment, including protrudes into heat-treatment furnace
At least one electrothermal radiation tube of portion for heat dissipation, further includes:
One is set to the first thermocouple inside the electrothermal radiation tube for Heating Zone Temperature control；
One is embedded at overtemperature alarm when temperature control and heating of the electric radiation tube wall for holding stage
The second thermocouple；And
One is set to the heat-treatment furnace workspace for temperature rise period temperature controlled third thermocouple；
Wherein, first thermocouple, the second thermocouple and third thermocouple are electrically connected temperature controller, the temperature
Controller is spent according to the temperature of each thermocouple monitoring, and the electrothermal radiation tube power supply is controlled by pid algorithm and is opened and closed, to described
Each phase temperature of heat-treatment furnace is precisely controlled.
Further, on the electrothermal radiation tube temperature control equipment, the electrothermal radiation tube itself is heater,
Without built-in heater.
Further, on the electrothermal radiation tube temperature control equipment, the side wall of the electrothermal radiation tube, which is provided with, is led
Discharge orifice.
Further, on the electrothermal radiation tube temperature control equipment, the bottom of the electrothermal radiation tube is offered
Opening.
Further, on the electrothermal radiation tube temperature control equipment, the electrothermal radiation tube is more, and every two
It is connected in series in pairs between electrothermal radiation tube described in root by connection sheet.
Further, on the electrothermal radiation tube temperature control equipment, the electrothermal radiation tube is installed in the heat
At the top for the treatment of furnace, and its wall thickness is in up big and down small.
The second aspect of the invention is to provide a kind of electrothermal radiation tube temprature control method, includes the following steps:
Step 1, several electrothermal radiation tubes arranged in pairs are set in the heat treatment furnace, is arranged inside electrothermal radiation tube
One thermocouple, for monitoring electrothermal radiation tube internal temperature；The second thermocouple is set in electric radiation tube wall, for monitoring electricity
Heat radiation tube tube wall temperature；And third thermocouple is set in electrothermal radiation tube outsourcing, for monitoring in heat-treatment furnace
The temperature of workspace；
Step 2, the temperature that third thermocouple detects is transmitted to temperature controller, the temperature controller executes control program
It is calculated and is judged, judge the working condition of the heat-treatment furnace for temperature rise period or holding stage；If working condition is to rise
Thermophase, the then temperature and target temperature difference surveyed with third thermocouple, controls the input power of the electrothermal radiation tube；
Step 3, in holding stage, the temperature that the second thermocouple detects is transmitted to temperature controller, the temperature controller
According to the target temperature of setting, the electrothermal radiation tube electricity is automatically controlled according to the target temperature by the temperature controller
The opening and closing in source, to adjust the temperature of the temperature-controlled area；In the temperature rise period, second thermocouple is not involved in Control for Kiln Temperature；
Step 4, the temperature that the first thermocouple detects is transmitted to temperature controller, the temperature controller is according to the report of setting
Alert temperature, judges whether the temperature of the heat-treatment furnace temperature control area is more than alarm temperature；If being more than alarm temperature, by described
Temperature controller automatically controls the logical of electrothermal radiation tube power supply according to the target temperature and closes, and temperature is made to be less than alarm temperature
Degree.
Further, in the electrothermal radiation tube temprature control method, the step (2), step (3) and step
(4) in, by the difference of the third thermocouple observed temperature and the temperature-controlled area target temperature, judge the heat-treatment furnace
The working condition of each temperature-controlled area be in temperature rise period or holding stage.
It is further preferred that in the electrothermal radiation tube temprature control method, when the third thermoelectricity of workspace
When the temperature occasionally detected is always below the target temperature, then corresponding heat-treatment furnace control zone is in the temperature rise period；Work as work
When the temperature of area's third thermocouple detection is greater than or equal to the target temperature, then corresponding heat-treatment furnace control zone enters heat preservation
Stage.
It is further preferred that in the electrothermal radiation tube temprature control method, when heat-treatment furnace is in the temperature rise period,
According to the difference of the third thermocouple observed temperature and the temperature-controlled area target temperature, furnace temperature is controlled by pid algorithm；When
Heat-treatment furnace enters holding stage, by the difference of the second thermocouple observed temperature and the temperature-controlled area target temperature,
Furnace temperature is controlled by pid algorithm.
Further, in the electrothermal radiation tube temprature control method, in step (3), the electrothermal radiation tube is produced
Raw Joule heat a part increases own temperature, and another part is transferred to environment by thermally conductive, radiation and convection type, makes heat
Treatment furnace environment temperature increases, in which:
If the outer diameter of the electrothermal radiation tube isWall thickness δ, resistance R, electric current generate Joule heat when passing through radiant tube:
Q=U2/R (1)
The resistance R of the electrothermal radiation tube (1) is determined by material and the geometric dimension synthesis of radiant tube:
R=ρ L/A (2)
In formula, ρ is the resistivity of radiant tube, and L is the length of radiant tube, and A is the sectional area of radiant tube；
According to thermal balance, the summation of each section heat is equal with Joule heat；
Q=Q1+Q2+Q3 (3)
In formula, Q is Joule heat, and Q1 is the heat that radiant tube itself heating absorbs, and Q2 is that radiant tube is transmitted to external environment (at heat
Manage furnace) heat, Q3 is that radiant tube is transmitted to the heat of tube environment；
In formula, m is radiant tube quality, and Cp is level pressure thermal capacitance,For average level pressure thermal capacitance, Tr is radiant tube temperature, and Tm is
Room temperature；
Q2=h0(Tr-Tf0) (5)
Q3=hi(Tr-Tfi) (6)
In formula (5) and (6), heat transfer coefficient of the ho between radiant tube and pipe external environment, hi is radiant tube and tube environment
Between heat transfer coefficient, Tfo is the temperature of pipe external environment, and Tr is tube wall temperature, and Tfi is tube environment temperature；
The temperature controller adjusts the temperature of the temperature-controlled area according to formula (3) by following formula (7):
In formula, Tfo is heat-treatment furnace workspace temperature, and Tr is radiation tube wall temperature, and Tfi is the radiant tube that thermocouple is measured
Interior temperature；
The temperature controller calculates real time temperature by Tfo, Tr, (Tr-Tfo) and (Tr-Tfi) value, using pid algorithm
And the deviation of target temperature exports control amount, realizes the accurate control that temperature rise period and holding stage temperature are carried out to heat-treatment furnace
System.
Further, in the electrothermal radiation tube temprature control method, the temperature rise period is according to workspace temperature
Carry out temperature control；Into after holding stage, according to the temperature signal temperature control of radiation tube wall.
The present invention by adopting the above technical scheme, compared with prior art, has the following technical effect that
(1) there is no heating wire inside the electrothermal radiation tube used, directly use radiant tube as heater, when circuit is connected,
The advantages of generation Joule heat makes radiant tube temperature quickly increase, directly heat radiant tube when electric current passes through radiant tube is to reduce
The link and thermal resistance of heat transfer, improve heat transfer efficiency, and under identical operating temperature, heater surface temperature is reduced, and extend spoke
Penetrate the service life of pipe；
(2) temperature controlling mode based on electrothermal radiation tube temperature control equipment, thermocouple is arranged in radiant tube
Portion radiates the workspace of tube wall and heat-treatment furnace, and different phase takes different temperature control methods, and the temperature rise period is according to workspace heat
The signal temperature control of galvanic couple, into after holding stage, according to the temperature signal temperature control of radiation tube wall.Since the position of thermocouple is solid
Determine, by airflow influence very little, control amount is exported using the deviation that pid algorithm calculates real time temperature and set temperature, to realize
Accurate control to resistance furnace temperature.It can guarantee the stability, uniformity, accuracy and sensitivity for measuring furnace temperature signal.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of electrothermal radiation tube temperature control equipment of the present invention；
Fig. 2 is a kind of partial enlargement structural representation of electrothermal radiation tube temperature control equipment of the present invention.
Specific embodiment
The present invention is described in more detail below by specific embodiment, for a better understanding of the present invention,
But following embodiments are not intended to limit the scope of the invention.
As shown in Figure 1, the present embodiment provides a kind of electrothermal radiation tube temperature control equipments, including protrude into inside heat-treatment furnace
At least one electrothermal radiation tube 1 for heat dissipation, further includes: one is set to inside the electrothermal radiation tube 1 for heating zone temperature
Spend the first thermocouple 2 of control；One is embedded at temperature control and heating of 1 tube wall of electrothermal radiation tube for holding stage
When overtemperature alarm the second thermocouple 3；And one be set to the heat-treatment furnace workspace for temperature rise period temperature control
Third thermocouple 4；Wherein, first thermocouple 2, the second thermocouple 3 and third thermocouple 4 are electrically connected temperature control
Device, the temperature controller control 1 power supply of electrothermal radiation tube by pid algorithm and open according to the temperature of each thermocouple monitoring
It closes, to be precisely controlled to each phase temperature of the heat-treatment furnace.
Electrothermal radiation tube temperature control equipment provided in this embodiment, is surveyed by temperature controller according to each thermocouple
Temperature controls the opening and closing of 1 power supply of electrothermal radiation tube by pid algorithm, controls temperature of heat treatment furnace.The electric radiation tube temperature
Degree control device proposes new temperature controlling mode, and thermocouple is arranged in inside, radiation tube wall and the Re Chu of electrothermal radiation tube
The workspace for managing furnace, different temperature control methods is taken for different phase: the temperature rise period carries out temperature control according to workspace temperature, and
Reference work area temperature and the temperature difference of wall temperature carry out comprehensive temperature control；Into after holding stage, according to the temperature signal of radiation tube wall
Temperature control, and temperature control is carried out with reference to the temperature difference of wall temperature and workspace mean temperature.Since the position of thermocouple is fixed, by airflow influence
Very little exports control amount using the deviation that pid algorithm calculates real time temperature and set temperature, to realize to resistance furnace temperature
Accurate control.It can guarantee the stability, uniformity, accuracy and sensitivity for measuring furnace temperature signal.
As a preferred embodiment, different from traditional radiant tube, the electrothermal radiation tube 1 used by the present embodiment
It is inside without the metal tube of heating wire, its own is heater, without built-in heater.As shown in Fig. 2, the electric radiation
The side wall of pipe 1 is provided with deflector hole 5, and bottom offers opening 6, is conducive to gaseous exchange and conducts heat.Specifically, the electrothermal radiation tube 1
Inside does not have resistance wire winding, and radiant tube 1 itself is exactly heater, and when radiant tube 1 is communicated to power supply, electric current is in radiant tube
Outer wall generates Joule heat, for heating.Electrothermal radiation tube 1 is made of electrothermal alloy；And surface area (diameter, length of radiant tube 1
And wall thickness) etc. geometric dimensions according to the power of heating furnace determine；1 one end of electrothermal radiation tube is electrode, and electrode both ends are fixed respectively
Insulating layer on the outside of furnace shell and on the inside of furnace shell.
Traditional electrothermal radiation tube structure is by there is a set of resistance wire winding inside radiant tube, and resistance wire passes through thermally conductive and spoke
The modes such as penetrating heat is transmitted to radiant tube increases radiant tube temperature, so radiant tube by it is thermally conductive, radiate and convection type adds
Heated work pieces.And there is no heating wire inside electrothermal radiation tube 1 used by the present embodiment, directly use radiant tube as heater, electricity
When road is connected, the advantages of Joule heat makes radiant tube temperature quickly increase, directly heat radiant tube is generated when electric current passes through radiant tube
It is to reduce the link of heat transfer and thermal resistance, improves heat transfer efficiency, under identical operating temperature, heater surface temperature drop
It is low, extend the service life of radiant tube.
As a preferred embodiment, the electrothermal radiation tube 1 is more, and between every two electrothermal radiation tubes 1
It is connected in series in pairs by connection sheet 7.As shown in Figure 1, electrothermal radiation tube 1 be two, between by connection sheet 7 series connection connect
It connects.In addition, the electrothermal radiation tube 1 is installed at the top of the heat-treatment furnace, and its wall thickness is in up big and down small, to guarantee to radiate
It manages that the gravity that the unit area that bears from top to bottom is born is of substantially equal, mitigates electrothermal radiation tube under the high temperature conditions uneven
Creep.
As another preferred embodiment, a kind of electric radiation based on above-mentioned electrothermal radiation tube temperature control equipment is provided
Pipe temprature control method, specifically comprises the following steps:
Step 1, several electrothermal radiation tubes arranged in pairs 1 are set in the heat treatment furnace, are arranged inside electrothermal radiation tube 1
First thermocouple 2, for monitoring 1 internal temperature of electrothermal radiation tube；The second thermocouple 3 is set in 1 tube wall of electrothermal radiation tube, is used for
Monitor 1 tube wall temperature of electrothermal radiation tube；And third thermocouple 4 is set in 1 outsourcing of electrothermal radiation tube, for monitoring
The temperature of heat-treatment furnace workspace；
Step 2, the temperature that third thermocouple 4 detects is transmitted to temperature controller, the temperature controller executes control journey
Sequence is calculated and is judged, judges the working condition of the heat-treatment furnace for temperature rise period or holding stage；If working condition
It is the temperature rise period, the temperature and target temperature difference just surveyed with third thermocouple 4 control the input power of radiant tube；
Step 3, in holding stage, the temperature that the second thermocouple 3 detects is transmitted to temperature controller, the temperature controller
According to the target temperature of setting, the electrothermal radiation tube is automatically controlled according to the target temperature by the temperature controller
(1) opening and closing of power supply, to adjust the temperature of the temperature-controlled area；In the temperature rise period, second thermocouple 3, which detects temperature, does not join
With Control for Kiln Temperature；
Step 4, the temperature that the first thermocouple 2 detects is transmitted to temperature controller, the temperature controller is according to setting
Alarm temperature judges whether the temperature of the heat-treatment furnace temperature control area is more than alarm temperature；If it exceeds alarm temperature, passes through institute
Logical the closing that temperature controller automatically controls 1 power supply of electrothermal radiation tube according to the target temperature is stated, temperature is made to be less than alarm
Temperature.
In the present embodiment, in the step (2), step (3) and step (4), temperature is surveyed by the third thermocouple 4
The difference of degree and the temperature-controlled area target temperature judges that the working condition of each temperature-controlled area of the heat-treatment furnace is in and rises
Thermophase or holding stage.
In the present embodiment, when the temperature that the third thermocouple 4 of workspace detects is always below the target temperature
When, then corresponding heat-treatment furnace control zone is in the temperature rise period；When the temperature that workspace third thermocouple 4 detects is greater than or equal to
When the target temperature, then corresponding heat-treatment furnace control zone enters holding stage.
In the present embodiment, when heat-treatment furnace is in the temperature rise period, according to 4 observed temperature of third thermocouple and the temperature
The difference for spending control zone target temperature, controls furnace temperature by pid algorithm；When heat-treatment furnace enters holding stage, pass through described
The difference of two thermocouples 3 observed temperature and the temperature-controlled area target temperature, controls furnace temperature by pid algorithm.
In the present embodiment, in step (3), Joule heat a part that the electrothermal radiation tube 1 generates makes own temperature liter
Height, another part are transferred to environment by thermally conductive, radiation and convection type, increase heat-treatment furnace environment temperature, in which:
If the outer diameter of the electrothermal radiation tube 1 isWall thickness δ, resistance R, U are voltage, and electric current generates when passing through radiant tube
Joule heat:
Q=U2/R (1)
The resistance R of the electrothermal radiation tube 1 is determined by material and the geometric dimension synthesis of radiant tube:
R=ρ L/A (2)
In formula, ρ is the resistivity of radiant tube, and L is the sum of the length of two radiant tubes, and A is the average cross-section of radiant tube
Product；
According to thermal balance, the summation of each section heat is equal with Joule heat；
Q=Q1+Q2+Q3 (3)
In formula, Q is Joule heat, and Q1 is the heat that radiant tube itself heating absorbs, and Q2 is that radiant tube is transmitted to external environment (at heat
Manage furnace) heat, Q3 is that radiant tube is transmitted to the heat of tube environment；
In formula, m is radiant tube quality, and Cp is level pressure thermal capacitance,For average level pressure thermal capacitance, Tr is radiant tube temperature, and Tm is
Room temperature；
Q2=h0(Tr-Tf0) (5)
Q3=hi(Tr-Tfi) (6)
In formula (5) and (6), heat transfer coefficient of the ho between radiant tube and pipe external environment, hi is radiant tube and tube environment
Between heat transfer coefficient, Tfo is the temperature of pipe external environment, and Tr is tube wall temperature, and Tfi is tube environment temperature；
The temperature controller adjusts the temperature of the temperature-controlled area according to formula (3) by following formula (7):
In formula, Tfo is heat-treatment furnace workspace temperature, and Tr is radiation tube wall temperature, and Tfi is the radiant tube that thermocouple is measured
Interior temperature；It remains unchanged in the average value of heat-treatment furnace stationary operational phase, temperature value Tfo, Tr and Tfi, exists between each other
Determining corresponding relationship.In process certification test, according to the radiation tube wall of actual measurement and pipe internal and external temperature homologous thread, can pass through
Experiment determines this corresponding relationship, then passes through Tfo, Tr, (Tr-Tfo) and (Tr-Tfi) value, benefit using the temperature controller
Export control amount with the deviation that pid algorithm calculates real time temperature and target temperature, realize to heat-treatment furnace carry out the temperature rise period and
The accurate control of holding stage temperature.
In addition, the temperature rise period carries out temperature control according to the difference of workspace observed temperature and the regional aim temperature, and
Reference work area temperature and the temperature difference of wall temperature carry out comprehensive temperature control, to reach target temperature；Into after holding stage, according to radiation
The difference temperature control of tube wall observed temperature and the regional aim temperature
Heat-treatment furnace temperature traditional at present is controlled by the temperature signal that the thermocouple of workspace is measured, this
Temperature control method is the problem is that the change in location of thermocouple insertion and the flowing of furnace gas change the temperature signal to measurement
Have a great impact, causes fluctuation, inaccuracy and lag of temperature signal etc.；Compared with prior art, base proposed by the present invention
In the temperature controlling mode of electrothermal radiation tube temperature control equipment, thermocouple is arranged in the inside of radiant tube, radiates tube wall and heat
The workspace for the treatment of furnace, different phase take different temperature control methods, the temperature rise period according to the signal temperature control of workspace thermocouple,
Into after holding stage, according to the temperature signal temperature control of radiation tube wall.Due to the position of thermocouple fixes, by airflow influence very
It is small, control amount is exported using the deviation that pid algorithm calculates real time temperature and set temperature, to realize the essence to resistance furnace temperature
Really control.It can guarantee the stability, uniformity, accuracy and sensitivity for measuring furnace temperature signal.
To sum up, the structure for simplifying radiant tube than traditional Resistant heating using radiant tube self-heating, reduces spoke
The heat transfer link and thermal resistance for penetrating pipe improve heating efficiency and rate, extend the service life；Meanwhile using temperature control proposed by the present invention
Method, due to the position of thermocouple fixes, by airflow influence very little, calculate real time temperature and set temperature using pid algorithm
Deviation exports control amount, to realize the accurate control to resistance furnace temperature.Can guarantee measure furnace temperature signal stability, uniformly
Property, accuracy and sensitivity.
Specific embodiments of the present invention are described in detail above, but it is merely an example, the present invention is simultaneously unlimited
It is formed on particular embodiments described above.To those skilled in the art, any couple of present invention carries out equivalent modifications and
Substitution is also all among scope of the invention.Therefore, without departing from the spirit and scope of the invention made by equal transformation and
Modification, all should be contained within the scope of the invention.
Claims (10)
1. a kind of electrothermal radiation tube temperature control equipment, including protruding at least one electric heating spoke inside heat-treatment furnace for heat dissipation
Penetrate pipe (1), which is characterized in that further include:
One is set to the first thermocouple (2) inside the electrothermal radiation tube (1) for Heating Zone Temperature control；
One is embedded at overtemperature alarm of the electrothermal radiation tube (1) tube wall for the temperature control of holding stage and when heating up
Second thermocouple (3)；And
One is set to the heat-treatment furnace workspace for temperature rise period temperature controlled third thermocouple (4)；
Wherein, first thermocouple (2), the second thermocouple (3) and third thermocouple (4) are electrically connected temperature controller,
The temperature controller controls the electrothermal radiation tube (1) power supply by pid algorithm and opens according to the temperature of each thermocouple monitoring
It closes, to be precisely controlled to each phase temperature of the heat-treatment furnace.
2. electrothermal radiation tube temperature control equipment according to claim 1, which is characterized in that the electrothermal radiation tube (1)
It itself is heater, without built-in heater.
3. electrothermal radiation tube temperature control equipment according to claim 1, which is characterized in that the electrothermal radiation tube (1)
Side wall be provided with deflector hole (5)；And the bottom of the electrothermal radiation tube (1) offers opening (6).
4. electrothermal radiation tube temperature control equipment according to claim 1, which is characterized in that the electrothermal radiation tube (1)
It is more, and is connected in series in pairs between every two electrothermal radiation tubes (1) by connection sheet (7).
5. electrothermal radiation tube temperature control equipment according to claim 1, which is characterized in that the electrothermal radiation tube (1)
It is installed at the top of the heat-treatment furnace, and its wall thickness is in up big and down small.
6. a kind of electrothermal radiation tube temprature control method, which comprises the steps of:
Step 1, several electrothermal radiation tubes arranged in pairs (1) are set in the heat treatment furnace, are arranged inside electrothermal radiation tube (1)
First thermocouple (2), for monitoring electrothermal radiation tube (1) internal temperature；In electrothermal radiation tube (1) tube wall, the second thermocouple is set
(3), for monitoring electrothermal radiation tube (1) tube wall temperature；And third thermocouple is set in electrothermal radiation tube (1) outsourcing
(4), for monitoring the temperature in heat-treatment furnace workspace；
Step 2, the temperature that third thermocouple (4) are detected is transmitted to temperature controller, the temperature controller executes control program
It is calculated and is judged, judge the working condition of the heat-treatment furnace for temperature rise period or holding stage；If working condition is to rise
Thermophase, the then temperature and target temperature difference surveyed with third thermocouple (4), controls the input of the electrothermal radiation tube (1)
Power；
Step 3, in holding stage, the temperature that the second thermocouple (3) are detected is transmitted to temperature controller, the temperature controller root
According to the target temperature of setting, the electrothermal radiation tube (1) is automatically controlled according to the target temperature by the temperature controller
The opening and closing of power supply, to adjust the temperature of the temperature-controlled area；In the temperature rise period, the second thermocouple (3) detection temperature is not joined
With Control for Kiln Temperature；
Step 4, the temperature that the first thermocouple (2) are detected is transmitted to temperature controller, the temperature controller is according to the report of setting
Alert temperature, judges whether the temperature of the heat-treatment furnace temperature control area is more than alarm temperature；If being more than alarm temperature, by described
Temperature controller automatically controls logical the closing of electrothermal radiation tube (1) power supply according to the target temperature, and temperature is made to be less than alarm
Temperature.
7. electrothermal radiation tube temprature control method according to claim 6, which is characterized in that the step (2), step
(3) and in step (4), pass through the difference of third thermocouple (4) observed temperature and the temperature-controlled area target temperature, judgement
The working condition of each temperature-controlled area of the heat-treatment furnace is in temperature rise period or holding stage.
8. electrothermal radiation tube temprature control method according to claim 7, which is characterized in that when the third of workspace
When the temperature of thermocouple (4) detection is always below the target temperature, then corresponding heat-treatment furnace control zone is in the temperature rise period；
When the temperature that workspace third thermocouple (4) detects is greater than or equal to the target temperature, then corresponding heat-treatment furnace control
Area enters holding stage.
9. electrothermal radiation tube temprature control method according to claim 7, which is characterized in that when heat-treatment furnace is in heating
Stage passes through pid algorithm control according to the difference of third thermocouple (4) observed temperature and the temperature-controlled area target temperature
Furnace temperature processed；When heat-treatment furnace enters holding stage, pass through the second thermocouple (3) observed temperature and the temperature-controlled area target
The difference of temperature controls furnace temperature by pid algorithm.
10. electrothermal radiation tube temprature control method according to claim 6, which is characterized in that in step (3), the electricity
Joule heat a part that heat radiation tube (1) generates increases own temperature, and another part is passed by thermally conductive, radiation and convection type
It is defeated by environment, increases heat-treatment furnace environment temperature, in which:
If the outer diameter of the electrothermal radiation tube (1) isWall thickness δ, resistance R, electric current generate Joule heat when passing through radiant tube:
Q=U2/R (1)
The resistance R of the electrothermal radiation tube (1) is determined by material and the geometric dimension synthesis of radiant tube:
R=ρ L/A (2)
In formula, ρ is the resistivity of radiant tube, and L is the length of radiant tube, and A is the sectional area of radiant tube；
According to thermal balance, the summation of each section heat is equal with Joule heat:
Q=Q1+Q2+Q3 (3)
In formula, Q is Joule heat, and Q1 is the heat that radiant tube itself heating absorbs, and Q2 is that radiant tube is transmitted to external environment (heat treatment
Furnace) heat, Q3 is that radiant tube is transmitted to the heat of tube environment；
In formula, m is radiant tube quality, and Cp is level pressure thermal capacitance,For average level pressure thermal capacitance, Tr is radiant tube temperature, and Tm is room temperature；
Q2=h0(Tr-Tf0) (5)
Q3=hi(Tr-Tfi) (6)
In formula (5) and (6), heat transfer coefficient of the ho between radiant tube and pipe external environment, hi is between radiant tube and tube environment
Heat transfer coefficient, Tfo is the temperature of pipe external environment, and Tr is tube wall temperature, and Tfi is tube environment temperature；
The temperature controller adjusts the temperature of the temperature-controlled area according to formula (3) by following formula (7):
In formula, Tfo is heat-treatment furnace workspace temperature, and Tr is radiation tube wall temperature, temperature in the radiant tube that Tfi measures for thermocouple
Degree；
The temperature controller calculates real time temperature and mesh by Tfo, Tr, (Tr-Tfo) and (Tr-Tfi) value, using pid algorithm
The deviation for marking temperature exports control amount, realizes the accurate control that temperature rise period and holding stage temperature are carried out to heat-treatment furnace.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910264271.0A CN109871052A (en) | 2019-04-03 | 2019-04-03 | A kind of electrothermal radiation tube temperature control equipment and its control method |
| PCT/CN2019/087869 WO2020199323A1 (en) | 2019-04-03 | 2019-05-21 | Electric-heating radiant tube temperature control device and control method therefor |
| JP2019547106A JP7037828B2 (en) | 2019-04-03 | 2019-05-21 | Temperature control method for electric radiant tube |
| TW108130021A TWI694319B (en) | 2019-04-03 | 2019-08-22 | Temperature control device with electrothermal radiant tube and method thereof |
Applications Claiming Priority (1)
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| CN201910264271.0A CN109871052A (en) | 2019-04-03 | 2019-04-03 | A kind of electrothermal radiation tube temperature control equipment and its control method |
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| JP (1) | JP7037828B2 (en) |
| CN (1) | CN109871052A (en) |
| TW (1) | TWI694319B (en) |
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| CN110144545A (en) * | 2019-06-14 | 2019-08-20 | 上海颐柏科技股份有限公司 | A kind of frequency converter and its speed regulating method for vacuum carburization process |
| CN112257191A (en) * | 2020-12-23 | 2021-01-22 | 中国人民解放军国防科技大学 | Load platform integrated microsatellite thermal control subsystem optimization method and system |
| CN113684442A (en) * | 2021-08-05 | 2021-11-23 | 江苏颐柏机械有限公司 | Variable-frequency speed regulation device for vacuum carburization process and speed regulation method thereof |
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| CN113372000B (en) * | 2021-04-02 | 2022-07-22 | 山东玻纤集团股份有限公司 | Bushing plate and intelligent heating method |
| CN114265446B (en) * | 2021-12-27 | 2023-07-14 | 广东蓝玖新能源科技有限公司 | Heat supply structure for hydrogen production reactor, temperature coordination control method and system |
| CN115505725A (en) * | 2022-09-24 | 2022-12-23 | 中国航空工业标准件制造有限责任公司 | Furnace temperature control method for aviation small part heat treatment process test |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW202038036A (en) | 2020-10-16 |
| JP7037828B2 (en) | 2022-03-17 |
| JP2021521498A (en) | 2021-08-26 |
| TWI694319B (en) | 2020-05-21 |
| WO2020199323A1 (en) | 2020-10-08 |
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