KR101997710B1 - Intelligent temperature control system and method for Heat treatment Furnace - Google Patents

Abstract

Disclosed is a temperature control apparatus and method for a heat treatment industry in which an internal process environment is maintained in a non-oxidizing process atmosphere. The temperature control device according to one aspect of the present invention is provided corresponding to each of a plurality of regenerative radiant tube burners disposed at equal intervals in the heat treatment furnace along the conveying direction of the object to be treated, A plurality of temperature detecting sensors for detecting a star temperature, a plurality of gas valves connected to respective ones of the radiant tube burners arranged for each zone by individual fuel supply pipes and for controlling gas supply to each of the radiant tube burners, And a controller configured to correspond to each of the radiant tube burners for individually controlling the tube burners and configured by a plurality of controllers connected to the temperature detection sensors and the gas valves, respectively, ) The operation of the radiant tube burner and the gas valve is individually controlled based on the respective temperature data, and the heat treatment inside the heat treatment furnace So that it is possible to precisely and precisely control the light intensity according to the zones.

Description

TECHNICAL FIELD [0001] The present invention relates to a temperature control system and method for a heat treatment industry,

The present invention relates to an apparatus and method for controlling a temperature in a heat treatment industry, and more particularly, to a method and apparatus for controlling and controlling a temperature in a heat treatment industry which can more accurately and precisely control a heat treatment environment inside a heat treatment furnace .

In general, advanced heat treatment products used for automobile parts such as steel, SUS, copper alloy, and electronic parts are subjected to heat treatment in a non-oxidizing atmosphere such as annealing, sintering and brazing in H2 and CO atmospheres. The atmospheric gas for forming such anoxic atmosphere is generated through combustion in a low air ratio, that is, in a fuel rich state, and is injected into the heat treatment furnace.

The atmospheric gas used for general heat treatment such as annealing, sintering, brazing, carburizing, etc. is usually an endothermic gas. Specifically, a denatured gas called Rx gas is mainly used. Rx gas is denatured in a catalytic reactor maintained at a high temperature (about 1000 ° C) by adding a raw material gas and an appropriate amount of air, and is subjected to annealing, sintering, brazing, .

The Rx gas used for the heat treatment in the heat treatment facility is generated through the Rx gas generator and an electric heater is mainly used as a heat source for creating a temperature environment suitable for the heat treatment. Electric heaters have an advantage in terms of temperature control. This is because accurate and rapid access to process-dependent process temperatures is possible. On the other hand, there is a disadvantage in terms of economy because of using electricity with high production cost.

Accordingly, a technique of using a regenerative radiant tube burner as a heat source instead of an electric heater has been proposed as an alternative. However, most of the conventional methods using radiant tube burners as the heat source control the temperature by controlling the air-fuel ratio (ratio of air and fuel). Therefore, it is difficult to guarantee promptness and accuracy in terms of temperature control .

Korean Patent Publication No. 2010-0037778 (published on April 12, 2010)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a temperature control apparatus and method for a heat treatment industry in which a heat treatment facility using a regenerative radiant tube burner as a heat source can quickly and accurately prepare an internal processing environment of a heat treatment furnace .

According to an aspect of the present invention,

A plurality of temperature detection sensors provided corresponding to each of a plurality of regenerative radiant tube burners arranged at equal intervals along a conveyance direction of the object to be treated in the heat treatment furnace and detecting the temperature of each zone in the heat treatment furnace;

A plurality of gas valves connected to respective ones of the radiant tube burners arranged in each zone by an individual fuel supply pipe and interrupting gas supply to each of the radiant tube burners;

And a controller configured to correspond to each of the radiant tube burners for individually controlling the radiant tube burners and configured by a plurality of controllers connected to the temperature detection sensors and the gas valves, respectively,

Wherein the controller controls the operation of the radiant tube burner and the gas valve on the basis of the temperature data for each zone provided by the temperature detection sensor so that the temperature for each zone is maintained within the set range, A temperature control device is provided.

In one aspect of the present invention, the control unit outputs a valve control signal including on / off and open time information for each gas valve from temperature data for each zone provided by the temperature detection sensor, The overall combustion load can be controlled by individually outputting an operation command to each tube burner.

Specifically, the control unit is electrically connected to a temperature detection sensor for each zone to receive temperature data, and transmits a corresponding temperature control signal to the main burner controller after comparing the detection temperature and the set temperature for each zone And a control unit for controlling the specific gas valve and the radiant tube burner by using some of the temperature control signal and the temperature data provided by the individual temperature controller and the temperature detection sensor, A main burner controller for delivering the signal to the main burner controller, and at least two individual burner controllers for individually receiving the other signals and data from the main burner controller to independently control the remaining gas valves and the radiant tube burners.

Here, the main burner controller and two or more individual burner controllers may be connected so as to allow bidirectional communication so that signals and data can be exchanged with each other.

In addition, three regenerative radiant tube burners and three temperature detection sensors are provided at equal intervals in the heat treatment furnace along the conveying direction of the object to be treated, and heat treatment is applied to each of the three radiant tube burners And the control unit includes three individual temperature controllers corresponding to three regenerative radiant tube burners, a temperature detection sensor, and a gas valve, and one main burner Controller, and two separate burner controllers to implement individual temperature control for the three zones inside the heat treatment furnace.

The control unit may be configured to control the switching cycle of the switching valve for alternately interrupting the inflow of combustion air and the discharge of exhaust gas to the heat storage unit of each of the radiant tube burners, The valve closing time can be used as a parameter to determine the opening time (gas supply time) of each gas valve.

Preferably, the heat treatment furnace may be a Rx gas generator built-in heat treatment furnace having a built-in reformer for forming an internal processing environment in an Rx gas atmosphere.

According to another aspect of the present invention as a solution to the problem,

(a) collecting temperature data for each zone from a temperature detection sensor provided for each zone of the heat treatment furnace;

(b) outputting a temperature control signal for each zone corresponding to the detected temperature for each zone included in the temperature data;

(c) outputting individual ignition signals and individual valve control signals for each of the radiant tube burner and the gas valve based on the temperature data for each zone provided by the temperature detection sensor and the temperature control signal; And

(d) ignition of radiant tube burners for each zone by the individual ignition signals and individual valve control signals, and gas supply to each of the radiant tube burners through a gas valve are controlled to control the temperature for each zone A method for controlling a temperature in a heat treatment industry, the method comprising:

In the step (b) of the other aspect of the present invention, the detection temperature for each zone included in the temperature data is compared with a set temperature previously manually stored by the manager or different according to the object to be processed, ) Temperature control signal.

In the step (c), the switching cycle of the switching valve for alternately interrupting the inflow of combustion air and the discharge of exhaust gas to the heat storage portion of each of the radiant tube burners and the switching of the gas valve in the direction of shutting off the gas supply (Gas supply time) of each gas valve by using the valve closing time at the time of opening of the valve, and selecting and outputting the valve control signal having the control current value corresponding to the calculated opening time.

According to the embodiment of the present invention, the heat treatment environment inside the heat treatment furnace is controlled for each zone through the individual control of the radiant tube burner and the gas valve based on the temperature data provided by the temperature detection sensor, Accurate temperature control is possible. As a result, it is possible to improve the performance of a heat treatment facility using a radiant tube burner as a heat source.

In addition, it is possible to construct a heat treatment facility that uses a radiant tube burner as a heat source, which is more advantageous in terms of energy production cost than an electric heater, and can exhibit temperature control performance at the level of an electric heater, thereby saving energy and reducing facility operation cost And it is advantageous in terms of control as compared with the method of controlling the temperature through controlling the air-fuel ratio in the radiant tube burner system.

1 is a schematic diagram of a facility for a heat treatment facility to which a temperature control device according to the present invention is applied.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a temperature control apparatus,
3 is a table showing a detailed description and a range of an automatic operation flow of the time reference control unit and a detailed description of each time according to the elementary control time involved in the automatic operation during the automatic operation of the RT burner.
4 is a view showing a sequence of a temperature control process performed by the temperature control device;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, the terminology used herein is used only to describe a specific embodiment and is not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

It is to be understood that the terms "comprises", "having", and the like in the specification are intended to specify the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Also, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software .

In the following description with reference to the accompanying drawings, the same reference numerals are given to the same constituent elements, and a duplicate description thereof will be omitted. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a conceptual view of a facility of a heat treatment facility to which the temperature control device according to the present invention is applied, and the overall construction of the heat treatment industry facility will be described first.

Referring to FIG. 1, a heat treatment industrial furnace to which a temperature control device is applied includes a heat treatment furnace 10 in which an internal environment is maintained in an Rx gas atmosphere. The heat treatment furnace 10 is provided with an inlet 12 through which a workpiece to be heat-treated is introduced and an outlet 14 through which a predetermined heat-treated workpiece is carried out, A heat treatment space is formed.

The size and shape of the heat treatment furnace 10 are not particularly specified because they can be designed differently depending on the material of the workpiece to be heat-treated, the quantity of the material to be heat-treated, the spatial environment in which the equipment is built, and the like. A reformer 20 containing a reaction catalyst for Rx gas production is charged into the heat treatment furnace 10.

The reformer 20 is supplied with a mixture (mixture raw material in which air is mixed with the raw material gas at a predetermined ratio) as a raw material for producing Rx gas through the raw material supply means 30. [ The raw material supply means 30 mixes the raw material gas and air at a predetermined ratio outside the heat treatment furnace 10 so that an Rx gas atmosphere suitable for the processing environment depending on the material is formed in the workpiece to be heat-treated, Supply.

The temperature of the internal space of the heat treatment furnace 10 can be maintained at a temperature suitable for the annealing treatment in the case of heat treatment, for example annealing, by the heating means. The heating means 40 is preferably a radiant tube burner 40, which uses gas as fuel, stores heat of the combustion heat and preheats the combustion air to preheat the combustion air, thereby greatly improving thermal efficiency. Hereinafter, referred to as 'RT burner') may be used.

The RT burner 40 is under the control of the control unit 50. The control unit 50 controls the internal environment of the heat treatment furnace 10 to be a temperature environment suitable for the heat treatment environment depending on the material of the object to be treated. The control unit 50 preferably controls the temperature inside the heat treatment furnace 10 by controlling the operation / stop of the RT burner 40 based on the temperature data inside the heat treatment furnace and controlling the combustion load.

The RT burner 40 can be disposed at equal intervals along the conveying direction of the object to be processed on the upper and lower sides of the conveyance belt 15 for conveying the object to be processed to the processing environment of the heat treatment furnace 10 maintained in the Rx gas atmosphere And the control unit 50 may include control logic for the automatic ignition and combustion load control of each of the burners according to the conveyance speed of the belt so that the total combustion load is controlled through the operation and stop control of each burner.

A nitrogen chamber 60 may be added to the inlet 12 side of the heat treatment furnace 10 to which the object to be treated is charged. And the nitrogen chamber 70 may be added to the side of the opposite outlet 14 to which the object to be treated is transferred. In this case, the internal environment of the heat treatment furnace 10 can be formed into a non-oxidizing atmosphere by the nitrogen gas continuously supplied from the outside into the nitrogen chambers 60 and 70.

Compared with the method which relies only on the Rx gas, which is a denaturating gas, the use amount of the gas can be greatly reduced and the fuel cost can be reduced and the process can be shortened by forming the heat treatment environment using the nitrogen gas in an oxygen free atmosphere. The workplace environment can be improved. In addition, since the negative pressure on the inlet 12 and the outlet 14 side of the heat treatment furnace 10 can be suppressed, the risk of explosion can be greatly reduced.

As described above, the control unit 50 controls the combustion load by controlling the ignition and operation / stop of the RT burner 40 on the basis of the temperature data in the collected heat treatment furnace. Preferably, the ignition control of the RT burner 40 and the control of the gas valves V1 to V3 connected to each of the RT burners 40 via the fuel supply pipes P1 to P3 are performed for each of the RT burners 40 And controls the operation and stop of the RT burner 40 by interrupting the supply of the fuel gas.

Hereinafter, a temperature control apparatus for a heat treatment industry according to the present invention including a control unit will be described.

2 is a block diagram schematically showing a temperature control apparatus for a heat treatment industry according to the present invention.

1 and 2, the temperature control apparatus according to the present invention mainly includes temperature detection sensors TC.1 to TC.3, gas valves V1 to V3, a plurality of controllers 52a to 52c , And 56a to 56c.

The controller 50 controls the temperature of the RT burner 40 based on the temperature data for each zone provided by the temperature detection sensors TC.1 to TC.3 so that the temperature inside the heat treatment furnace is maintained within the set range. And the gas valves V1 to V3, respectively.

A plurality of temperature detection sensors TC.1 to TC.3 may be provided to correspond to each of a plurality of regenerative RT burners 40 arranged at equal intervals along the conveyance direction of the object to be treated in the heat treatment furnace .

The plurality of temperature detection sensors TC.1 to TC.3 detect the temperature of each zone of the heat treatment furnace which is virtually divided based on the period of the radiant heat of each of the RT burners 40a to 40c, And transfers the data to the control unit 50. [

Contact type temperature detection sensors TC.1 to TC.3 for measuring the temperature of the hot wire radiating from the RT burner 40 are suitable for temperature detection for each zone, 1 to TC.3) can be transmitted to the controller 50 through an independent transmission path. And may be transmitted to individual temperature controllers 52a to 52c, which will be described later, which are provided correspondingly.

The gas valves V1 to V3 are provided to correspond to the respective RT burners 40 arranged for each zone and can be connected through individual fuel supply pipes P1 to P3. Each of the gas valves V1 to V3 individually operates under the control of the control unit 50 based on the temperature data for each zone collected from the temperature detection sensors TC.1 to TC.3, To 40c, respectively.

The control unit 50 is provided corresponding to each RT burner 40 for the individual control of the RT burner 40 and is provided for each of the temperature detection sensors TC.1 to TC.3 and the gas valves V1 to V3 And a plurality of controllers 52a to 52c, 56a to 56c connected to the controller 50. [

The control unit 50 preferably controls the gas valves V1 to V3 from the temperature data for each zone provided by the respective temperature detection sensors TC.1 to TC.3 arranged in the zones in the heat treatment furnace, A valve control signal including on / off and open time information is outputted to each of the RT burners 40a to 40c, and the entire combustion load is controlled by individually outputting an operation command to each of the RT burners 40a to 40c.

The control unit 50 may be specifically configured to include individual temperature controllers 52a to 52c, a main burner controller 56a, and individual burner controllers 56b and 56c. Each of the individual temperature controllers 52a to 52c is electrically connected to each of the temperature detection sensors TC.1 to TC.3 for each zone to receive the temperature data and compare the detection temperature and the set temperature for each zone, To the main burner controller 56a.

The main burner controller 56a is a key component that controls the overall operation of the heat treatment equipment such as the speed of the conveyance belt 15 and the overall burning load through the operation control of the RT burner 40 to provide a heat treatment environment that varies depending on the product. In particular, based on the information collected from the temperature detection sensors TC.1 to TC.3, the main operation of the RT burner 40 and the on / off control of the gas valves V1 to V3 are mainly performed.

The main burner controller 56a is controlled by the temperature control signals provided by the individual temperature controllers 52a to 52c and the temperature detection sensors TC.1 to TC.3 and a part of the temperature data provided by the first individual temperature controller 52a (The first gas valve V1) and the RT burner (the first RT burner 40a (the second gas valve V1)) with the data (the temperature detection signal provided by the first temperature detection sensor TC1) ). And transfers some other signals and data to the respective individual burner controllers 56b and 56c.

The individual burner controllers 56b and 56c receive different signals and data from the main burner controller 56a and function to individually control the remaining gas valves V2 to V3 and the RT burners 40b and 40c. The individual burner controllers 56b and 56c can be determined (N-1) according to the number N of the RT burners 40 applied to the heat treatment furnace. For example, as shown in FIG. 2, two RT burners 40 may be configured to control the RT burners 40 corresponding to the three RT burners 40, respectively.

The main burner controller 56a and the individual burner controllers 56b and 56c are connected to the RT burner 40 by signals and data, for example, information regarding the operating state of the current RT burner 40 according to the control of the RT burner 40, Information on the control state of the gas valves V1 to V3 for controlling the supply of the gas as the fuel and the supply amount (valve opening and closing amount and opening amount information) for controlling the supply amount can be mutually connected so that more efficient control can be performed .

The control unit 50 and preferably the main burner controller 56a are provided with switching valves V4 to V6 and 4Way valves V4 to V6 for alternately interrupting combustion air inflow and exhaust gas discharge to the heat storage units of the RT burners 40a to 40c, And the valve closing time when the gas valves V1 to V3 are switched in the direction of shutting off the gas supply are set as parameters and the opening times of the gas valves V1 to V3 Can be determined.

Preferably, the gas supply time (fuel supply time) through the gas valves V1 to V3 to the RT burners can be adjusted to Tx by using the following relational expression.

[Relational expression]

Xm = T5 - T6 - T7, Output (%) = Tx / Xm

Here, T5 is a switching period of the switching valves V4 to V6 for alternately interrupting the inflow of combustion air and the exhaust gas to the heat storage portions of the RT burners 40, T6 and T7 can be switched between the Pre Time and Post Time to close the gas valves V1 to V3 in order to prevent the burner from being turned off when the changeover valves V4 to V6 are switched, Respectively.

T6 and T7 may preferably take about 0.1 second to 2 seconds depending on the valve size, structure, and switching method. Therefore, it is preferable that the overall control time is set considering the minimum switching time to about 0.1 sec. In the above relational expression, Output (%) indicates a total combustion load ratio automatically determined by manual input or a predetermined algorithm according to the object to be treated.

The adjustment of the gas supply time (fuel supply time) for each of the RT burners will be further described with reference to FIG.

FIG. 3 is a table showing an automatic operation flow and a specific description and range of each time according to a time reference control unit in which control time for each element involved in automatic operation in automatic operation of the RT burner based on temperature data is schematized.

In Fig. 3, T1 denotes the operating time of the ignition coil for the operation of the RT burner (start), which indicates the time from when the ignition coil is turned on to when the ignition signal is applied, and is turned off after the ignition is completed. The ignition signal can be generated by each burner controller (main burner controller or individual burner controller) based on the temperature data and transmitted to the ignition coil of each corresponding RT burner.

T1 can be determined flexibly within a range of 1 to 10 sec considering the switching time of the gas valve and the switching valve, and the minimum operation time required to ignite the RT burner to be stable (start) is 1 sec (See the time table in FIG. 3).

T2 indicates the time taken to open the gas valve (gas valve ON) for interrupting gas supply to the RT burners after the automatic operation command is inputted to the RT burner, that is, after outputting the ignition signal. It may take about 0.1 to 2 sec depending on the size, structure and switching method of the valve. It is preferable that the total control time is set considering the minimum switching time to about 0.1 sec.

T3 indicates the time until the flame is detected when the ignition is normally performed, that is, the time taken until the flame is confirmed through the flame detection sensor, as the fuel gas is supplied to the gas valve at the same time as the ignition coil is operated. This may be about 1 to 5 sec, taking into consideration the reaction time between the arc and the mixed fuel (air + fuel) and the time required to transmit and receive the flame detection signal according to the operation of the ignition coil.

T4 is a time required for the control of switching the gas valve to the closed position after the flame of the burner is confirmed through the flame detection sensor (after the flame detection sensor is on) Quot; < / RTI > This is not particularly limited because it may vary depending on the set temperature and the temperature data for each actual zone detected by the temperature detection sensor.

Since T5 to T7 have been described above, redundant description will be omitted below.

Meanwhile, the temperature control device according to the embodiment of the present invention may be provided in a form suitable for three zones, for example, as illustrated in the drawings (FIGS. 1 and 2). That is, it can be provided in a form in which temperature control can be individually performed for each zone (zone) in the heat treatment which is virtually divided into three zones. Of course, the present invention is not limited to the form suitable for the illustrated three-zone control.

In the case of the three zone control as shown in the figure, three RT burners 40a to 40c and three temperature detection sensors TC.1 to TC.3 are arranged at equal intervals in the heat treatment furnace along the conveying direction of the object to be processed And one gas valve V1 to V3 may be installed in each of the first to third individual fuel supply pipes P1 to P3 outside the heat treatment furnace so as to interrupt gas supply to each of the three RT burners 40a to 40c have.

The control unit 50 for controlling the operation of each of the RT burners 40a to 40c and the gas valves V1 to V3 is connected to three temperature detection sensors TC.1 to TC.3, One main burner controller 56a and two individual burner controllers 56b and 56c corresponding to the respective individual temperature controllers 52a to 52c and the RT burner 40 and the gas valves V1 to V3 , Individual temperature control for the three zones (Zone) inside the heat treatment furnace which is virtually partitioned can be realized.

Hereinafter, a temperature control process performed by the temperature control apparatus of the heat treatment industry having the above-described configuration will be described.

FIG. 4 is a view showing a sequence of a temperature control process performed by the temperature control device.

Referring to FIG. 4 and FIG. 2 attached hereto, collecting temperature data for each zone from the temperature detection sensors TC.1 to TC.3 provided for each zone in the heat treatment furnace S100) is performed. Temperature data for each zone by the temperature detection sensors TC.1 to TC.3 can be simultaneously received by the individual temperature controllers 52a to 52c and the main burner controller 56a which are electrically connected to the respective sensors .

A step S200 of outputting a temperature control signal for each zone corresponding to the detection temperature for each zone included in the next temperature data is performed. Preferably, the individual temperature controllers 52a to 52c perform arithmetic processing for comparing the detection temperature for each zone included in the temperature data with the set temperature stored in a different value depending on the manual setting or the object to be processed, It is possible to output a temperature control signal for each zone.

A step S300 of outputting individual ignition signals and individual valve control signals for the RT burners 40a to 40c and the gas valves V1 to V3 is performed after the step S200. Specifically, based on the temperature data for each zone provided by the respective temperature detection sensors TC.1 to TC.3 and the temperature control signals outputted by the individual temperature controllers 52a to 52c, Output individual ignition signals and individual valve control signals for the RT burners 40a to 40c and the gas valves V1 to V3, respectively.

In this process, the switching cycles of the switching valves V4 to V6 for alternately interrupting the combustion air inflow and the exhaust gas discharge to the heat storage portions of the RT burners 40a to 40c, and the switching periods of the gas valves V1 to V3, The valve closing time when switching is switched to the direction of shutting off the supply is calculated by using a parameter to calculate the opening time of each of the gas valves V1 to V3 and the valve control signal having the control current value corresponding to the calculated opening time Can be selected and output.

The final step is to control the temperature for each zone by interrupting gas supply to each of the RT burners 40a to 40c through the ignition of each of the RT burners 40a to 40c and the gas valves V1 to V3 The individual ignition signals and the individual valve control signals are used to ignite the RT burners 40a to 40c for each zone and to ignite each of the RT burners 40a to 40c through the gas valves V1 to V3, The gas supply can be controlled to control the temperature for each zone.

According to the embodiments of the present invention described above, the heat treatment environment inside the heat treatment furnace is controlled for each zone through the individual control of the radiant tube burner and the gas valve based on the temperature data provided by the temperature detection sensor, Accurate and accurate temperature control is possible. As a result, it is possible to improve the performance of a heat treatment facility using a radiant tube burner as a heat source.

In addition, it is possible to construct a heat treatment facility that uses a radiant tube burner as a heat source, which is more advantageous in terms of energy production cost than an electric heater, and can exhibit temperature control performance at the level of an electric heater, thereby saving energy and reducing facility operation cost And it is advantageous in terms of control as compared with the method of controlling the temperature through controlling the air-fuel ratio in the radiant tube burner system.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

10: heat treatment furnace 15: conveying belt
20: reformer 30: raw material supplying means
40: Radiant tube burner 50:
52a to 52c: individual temperature controller 56a: main burner controller
56b, 56b: individual burner controller 60, 70: nitrogen chamber
TC.1, TC.2, TC.3: Temperature detection sensor

Claims (10)

The radiant tube burners 40a to 40c are provided corresponding to each of the plurality of regenerative radiant tube burners 40a to 40c arranged at equal intervals along the conveying direction of the object to be treated in the heat treatment furnace, A plurality of temperature detection sensors (TC.1 to TC.3) for detecting the temperature of each zone of the heat treatment furnace virtually partitioned on the basis of the temperature detection sensors (TC1 to TC.3);
The plurality of radiant tube burners 40a to 40c are connected to the respective radiant tube burners 40a to 40c by individual fuel supply pipes P1 to P3 and the radiant tube burners 40a to 40c, Gas valves (V1 to V3);
And is connected to each of the temperature detection sensors TC.1 to TC.3 and the gas valves V1 to V3 in correspondence with the respective radiant tube burners for individual control of the radiant tube burners 40a to 40c. And a control unit (50) comprising a plurality of controllers,
The control unit (50)
The radiant tube burners 40a to 40c and the radiant tube burners 40a to 40c are controlled based on the temperature data for each zone provided by the temperature detection sensors TC.1 to TC.3 so that the temperature for each zone is kept within the set range. The operation of the gas valves V1 to V3 is individually controlled so that the radiant tube burner (or the radiant tube burner) is operated in accordance with the conveyance speed of the conveyance belt 15, 40a to 40c, respectively, wherein the gas supply time for each of the radiant tube burners is adjusted to Tx, which is calculated through the following relationship: < EMI ID = 1.0 >Lt; / RTI >

[Relational expression]
Xm = T5 - T6 - T7, Output (%) = Tx / Xm
(Where T5 is a switching cycle of the switching valves V4 to V6 for alternately interrupting the inflow of combustion air and the exhaust gas to the heat storage portions of the respective radiant tube burners, and T6 and T7 denote switching cycles of the switching valves V4 ~ V6) is Pre Time and Post Time to close the gas valves (V1 ~ V3) in order to prevent the burner from being turned off during the changeover. Output (%) is automatically input by manual input or by a predetermined algorithm Which indicates the total combustion load ratio to be determined)
The method according to claim 1,
The control unit 50 determines on / off and open time information for each of the gas valves V1 to V3 from the temperature data for each zone provided by the temperature detection sensors TC.1 to TC.3 And outputs an operation command to each of the radiant tube burners 40a to 40c to control the overall combustion load.
3. The method of claim 2,
The control unit (50)
The temperature sensor is electrically connected to the temperature detection sensors TC.1 to TC.3 for each zone and receives the temperature data. After comparing the detection temperature and the set temperature for each zone, a corresponding temperature control signal is transmitted to the main burner controller (56a);
The temperature of the specific gas valve V1 and the temperature of the radiant tube burner (temperature sensor) A main burner controller 56a for controlling the main burner controller 40a and delivering some other signals and data to the individual burner controllers 56b and 56c; And
Two or more individual burner controllers 56b, 56c (not shown) are provided for receiving the other signals and data from the main burner controller 56a and separately controlling the remaining gas valves V2, V3 and radiant tube burners 40b, ) For controlling the temperature of the heat treatment furnace.
◈ Claim 4 is abandoned due to the registration fee. The method of claim 3,
Wherein the main burner controller (56a) and at least two individual burner controllers (56b, 56c) are bidirectionally communicably connected so that signals and data can be exchanged with each other.
The method according to claim 1,
Three regenerative radiant tube burners 40a to 40c and three temperature detection sensors TC.1 to TC.3 are provided in the heat treatment furnace at equal intervals along the conveying direction of the object to be treated,
Each of the three radiant tube burners 40a to 40c is provided with one gas valve V1 to V3 on the first to third individual fuel supply pipes P1 to P3 outside the heat treatment furnace so as to intermittently supply gas to the three radiant tube burners 40a to 40c,
The control unit 50 includes three individual temperature controllers 52a to 52c and three temperature controllers 52a to 52c corresponding to three regenerative radiant tube burners, temperature detection sensors TC.1 to TC.3, and gas valves V1 to V3. The main burner controller 56a and the two individual burner controllers 56b and 56c to individually control the temperatures of the three zones inside the heat treatment furnace which are virtually divided. Lt; / RTI >
delete The method according to claim 1,
Wherein the heat treatment furnace is a Rx gas generator built-in type heat treatment furnace having a reformer (20) for constituting an internal process environment in an Rx gas atmosphere.

delete delete delete

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