JP2002048336A - Combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to control temperature distribution inside a furnace to be the desired temperature distribution in heating the inside of the furnace with a combustion control pattern, wherein the combustion states of a plurality of dispersedly arranged burners are predetermined in accordance with the elapse of time. SOLUTION: A control means 100 controls the combustion state in the combustion control patterns of a plurality of burners 4 dispersedly arranged inside the furnace 13 changing with each of burners.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a combustion control pattern in which a plurality of burners for heating the inside of a furnace are provided in a distributed manner, and a combustion state of each of the plurality of burners is determined with a lapse of time. The present invention relates to a combustion device provided with control means for controlling combustion of a plurality of burners.

[0002]

2. Description of the Related Art In such a combustion apparatus, the combustion in a plurality of burners arranged in a distributed manner is controlled based on a combustion control pattern which determines a combustion state of each burner with the passage of time, thereby obtaining an atmosphere in a furnace. To heat the inside of the furnace to a predetermined target temperature or a predetermined target temperature distribution.

Conventionally, for example, Japanese Patent Application Laid-Open No. 9-2
As shown in Japanese Patent No. 87736, a thermometer is installed at a load measurement point (for example, a central position in the furnace) representing the entire thermal load in the furnace, and the difference between the detected temperature of the thermometer and the target temperature is measured. The heat load in the furnace is determined, and the combustion state of each burner in the combustion control pattern is changed and adjusted according to the determined heat load. The adjustment of the combustion state of each burner according to the heat load will be specifically described.
For example, in the case of a combustion control pattern in which the same pattern is repeated in a predetermined cycle time, under the condition that the combustion time of each burner is constant, the cycle time is shortened when the heat load is large as compared to when the heat load is small. Or under the condition that the cycle time is kept constant, the burn time of each burner is increased by the same ratio when the heat load is large compared to when the heat load is small. Was.

[0004] However, as described above, in the control for similarly changing and adjusting the combustion state of a plurality of burners in accordance with the overall heat load in the furnace determined based on the detected temperature at a representative point in the furnace, Although it is possible to control the temperature in the furnace to be maintained at the target temperature on average, the temperature distribution in the furnace is necessarily controlled to the desired temperature distribution with high accuracy (for example, the temperature at each point in the furnace is made uniform). Target temperature). Therefore, in order to remedy such a problem, the temperature at various points in the furnace or at a specific position (for example, the planned position of a processing object to be installed in the furnace) is measured, and the degree of influence of each burner on each measured temperature is measured. That is, the target combustion pattern for each burner (for example, the combustion time of each burner under the condition that the cycle time is constant) is individually changed and adjusted manually while taking into consideration the heat load distribution in the furnace. The temperature distribution inside was adjusted to a desired temperature distribution.

[0005]

However, as in the above-mentioned prior art, it takes considerable skill to manually change and adjust the combustion state of each burner, and the adjustment work is troublesome because it is a manual operation. There was a defect that was. Furthermore, when the heat load distribution in the furnace changes, there is also the inconvenience that the troublesome adjustment work for the combustion state of each burner must be performed again. As a result, in such manual adjustment, the temperature distribution in the furnace could not be controlled accurately and accurately to a desired temperature distribution.

The present invention has been made in view of the above circumstances, and an object of the present invention is to heat the inside of a furnace by burning a plurality of burners arranged in a distributed manner in a combustion control pattern that determines a combustion state over time. In this case, it is an object of the present invention to provide a combustion device that can accurately and precisely control a temperature distribution in a furnace to a desired temperature distribution without having to perform troublesome manual adjustment for each burner. .

[0007]

According to a first aspect of the present invention, the control means controls the combustion of the plurality of burners in accordance with a heat load at a plurality of load measurement points distributed in the furnace. The combustion state in the pattern is configured to be changed and adjusted for each burner. That is, according to the heat load at a plurality of load measurement points dispersedly set in the furnace, the combustion state over time of the plurality of burners dispersedly arranged for heating the furnace is changed and adjusted for each burner. I do. For example, if the temperature distribution in the furnace is controlled to be a uniform temperature distribution, that is, the temperature at each point in the furnace is controlled to be the same target temperature, the heat load at each of the load measurement points is equal. The combustion state of each burner is adjusted so as to achieve. When the temperature distribution in the furnace is controlled so as to be a non-uniform set temperature distribution, each burner is set so that the heat load at each of the load measurement points becomes a heat load that generates the set temperature distribution. Adjust the combustion state of the. Therefore, in accordance with the heat load at a plurality of load measurement points distributed in the furnace, the combustion state of the plurality of distributed burners over time is automatically changed and adjusted for each burner. Thus, it is possible to provide a combustion device that can accurately and accurately control the temperature distribution in the furnace to a desired temperature distribution without having to perform troublesome manual adjustment.

According to a second aspect, in the first aspect, a reference load detecting means for detecting a reference heat load at a reference measurement point representing a total load in the furnace among the plurality of load measurement points; A plurality of individual load detection units for detecting individual heat loads at a plurality of individual measurement points other than the reference measurement point are provided, and the control unit sets the combustion control pattern based on the detection information of the reference load detection unit. Set,
And, based on the detection information of each of the plurality of individual load detection means, the combustion state of the burner associated with each of the individual measurement points among the plurality of burners is changed and adjusted in the combustion control pattern. ing. That is, based on the detection information of the reference load detecting means for detecting the reference heat load at the reference measurement point representing the total load in the furnace among the plurality of load measurement points, the combustion state of each burner over time is determined. The combustion control pattern is set, and each individual measurement among a plurality of burners is performed based on detection information of a plurality of individual load detection units that detect individual heat loads at a plurality of individual measurement points other than the reference measurement point. The combustion state of the burner associated with the point in the set combustion control pattern is changed and adjusted.

Therefore, the combustion state of each burner over time is adjusted based on the reference heat load at the reference measurement point representing the overall heat load in the furnace. The combustion state corresponding to each of the individual measurement points among the plurality of burners can be set based on the individual heat loads at the plurality of individual measurement points other than the reference measurement point. Since the state is changed and adjusted, the combustion state of each burner adjusted to correspond to the overall load in the furnace can be finely adjusted to correspond to each individual heat load. In other words, the multiple load measurement points are divided into functions as a reference measurement point that detects the overall load in the furnace and an individual measurement point that detects the individual heat load at each location in the furnace, and are used as detection information of the overall load. By controlling a plurality of burners uniformly based on the overall load in the furnace based on the detected information of the individual heat loads, the burners are fine-tuned to a combustion state corresponding to the individual heat loads. Instead of dividing a plurality of load measurement points into functions as described above, for example, based on detection information of a plurality of load measurement points, a total load and an individual load are discriminated and combustion of each burner is controlled. Although the control configuration is simple, the temperature distribution in the furnace can be controlled to a desired temperature distribution with high accuracy, and the preferable means of claim 1 can be obtained.

According to a third aspect, in the second aspect, the control means sets, as the combustion control pattern, a pattern which is repeated at a set cycle time changed according to the reference heat load, and The combustion state of the burner associated with each of the individual measurement points within the set cycle time is changed and adjusted according to the individual heat load. That is, a pattern repeated at a set cycle time is set as the combustion control pattern, the set cycle time is changed according to the reference heat load, and the set cycle time of the burner associated with each of the individual measurement points is set. The combustion state in the chamber is changed and adjusted according to the individual heat load. Therefore, the combustion control pattern may be set only within the set cycle time, not over the entire time period from the start of operation to the stop of operation of the combustion device.
The amount of information required to set the combustion control pattern can be reduced, and each burner is adjusted according to the overall load by changing the set cycle time, and each burner is adjusted according to each individual heat load. Can be adjusted by changing and adjusting the combustion state within the set cycle time.
Further simplification of the control configuration is realized, and the preferable means of claim 2 is obtained.

According to a fourth aspect of the present invention, in the third aspect, the control means sets a burner associated with a load measurement point having the largest heat load among the plurality of individual measurement points as a reference burner and burns the reference burner. The state is set as a reference combustion state, and the combustion state of the other burners other than the reference burner is changed to a smaller heat load than the reference combustion state, so that the individual heat loads of the plurality of burners are changed. The combustion state is adjusted accordingly. That is, the combustion state of the reference burner, which is the burner associated with the load measurement point having the largest heat load among the plurality of individual measurement points, is set as the reference combustion state, and the combustion state of other burners other than the reference burner is set. The combustion state is adjusted in accordance with the individual heat load at the plurality of individual measurement points of the plurality of burners by changing the reference burner to a smaller heat load side than the reference combustion state.

Therefore, when adjusting the combustion state of a plurality of burners according to the individual heat loads at a plurality of individual measurement points, the reference combustion state set for the reference burner associated with the load measurement point having the largest heat load is determined. Also, since the combustion state of each burner is adjusted by changing the heat load to the smaller side, even when the variation in the individual heat load at the plurality of individual measurement points is large, for example, a reference burner is previously set among the plurality of burners. If set, if the heat load of the individual measurement points related to the reference burner is small, the combustion state of the other burners will be changed to a larger heat load than the reference combustion state of this reference burner, and will reach the limit state, Further adjustment of the combustion state may not be possible, but according to the present invention, the combustion state of each burner can be surely adjusted without such inconvenience. Suitable means are obtained. For example, in a case where the combustion time is changed and adjusted as the combustion state within the set cycle time of each burner according to each individual heat load, a reference is made to a reference burner associated with a load measurement point having the largest heat load. Since the longest reference combustion time is set as the combustion state, and the combustion time of the other burners is changed to a time shorter than the reference combustion time, the change of the combustion time of each burner can be reliably adjusted.

According to a fifth aspect, in any one of the second to fourth aspects, the association between each of the plurality of individual measurement points and the plurality of burners is configured to be freely changeable.
That is, the association between each of the plurality of individual measurement points and each of the plurality of burners is changed in accordance with conditions such as the number and the set positions of the plurality of individual measurement points in the furnace and the number and the installation positions of the plurality of burners. be able to. Therefore, for example, the number of individual measurement points and the number of burners are made the same, and each individual measurement point is associated with the number of each burner on a one-to-one basis, or the number of individual measurement points is set to the number of burners. By associating a plurality of burners with one individual measurement point with a smaller number, and associating each of the plurality of individual measurement points with a plurality of burners according to the specific conditions of the furnace. Can be changed as appropriate, and accordingly, Claim 2
The preferred means of any one of (1) to (4) is obtained.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention applied to a combustion apparatus for heating a box type heat treatment furnace will be described. As shown in FIG. 1, four burners 4 (4a, 4b, 4c, 4d) for heating a furnace interior 13 of a box-shaped furnace body 11 having an opening / closing door 12 are provided in a distributed manner. A control device 7 for controlling each of the burners 4;
A touch panel type operation panel 8 for sending various operation commands to the control device 7 is provided. Then, the processing object is disposed in the furnace 13, and the four burners 4 are controlled by the control device 7 to heat the furnace 13 to a predetermined target heating condition so as to perform the heat treatment of the processing object. Make up.

Each of the burners 4 has the same construction, and each of the burners 4 has a fuel gas supply passage 9 provided with a gas on-off valve Vg and a combustion air supply passage provided with an air on-off valve Va. 10 is connected. Then, by intermitting the supply of the fuel gas to the burner 4 by the gas on-off valve Vg, the burner 4 can be burned or the combustion can be stopped.

As shown in FIG. 2, four burners 4
Are installed on the opposed side walls 11a and 11b of the furnace body 11 in a state where the flame injection direction of each burner toward the inside of the furnace is shifted laterally in plan view, and further clarify the positional relationship between the burners. For this reason, they are numbered as 4a, 4b, 4c and 4d in order from the one located near the door 12.

Next, a control configuration of the combustion device will be described. As a temperature sensor for detecting the temperature of the furnace 13, a master temperature sensor TM is installed at a central position of the furnace 13,
Positioning each burner 4 on the extension of the flame injection direction,
Individual temperature sensors T1, T2, T3, and T4 are provided. Then, the detection signals of these temperature sensors are input to the control device 7. The master temperature sensor TM is arranged at a position where it is not directly affected by the combustion of each burner 4.

In other words, a plurality of (in this case, five) load measurement points distributed and set in the furnace 13 correspond to the temperature sensors T
M, T1 to T4, and a reference measurement point representing the overall load of the furnace 13 among the plurality of load measurement points corresponds to the position of the master temperature sensor TM, and Plural (four) individual measurement points other than the reference measurement point correspond to the positions of the individual temperature sensors T1 to T4. Further, each individual measurement point is associated with each burner 4 according to the degree of influence on each individual measurement point. Specifically, the temperature sensor T1 and the burner 4a, the temperature sensor T2 and the burner 4b, the temperature sensor T3 and the burner 4c,
The association is made by each combination of the temperature sensor T4 and the burner 4d. The association of each of the plurality of individual measurement points with the plurality of burners 4 is configured to be freely changeable, as described in a third embodiment described later.

The operation panel 8 has a temperature setting section 81 for setting a target temperature SP and a temperature display section 8 for displaying the target temperature SP.
2, and an operation start / stop switch (not shown).

The control device 7 determines the thermal load of the entire furnace based on the deviation between the detected temperature Pv0 of the master temperature sensor TM and the target temperature SP set by the temperature setting section 81, and outputs a temperature control output. A temperature controller 71 that outputs a signal, a pattern setting unit 72 that sets a combustion control pattern that determines a combustion state of each burner 4 over time,
A combustion control unit 73 that controls the combustion of each burner 4 according to the combustion control pattern set by the pattern setting unit 72 is provided. In other words, the control unit 100 is configured to control the combustion of the four burners 4 by using the control device 7 in a combustion control pattern that determines the combustion state over time of each of the four burners 4. I have. Further, a reference load detecting means for detecting a reference heat load at the reference measurement point,
It comprises the master temperature sensor TM.

The combustion control unit 73 obtains a temperature difference between the detected temperatures Pvn (n = 1 to 4) of the individual temperature sensors T1 to T4 and the detected temperature Pv0 of the master temperature sensor TM, and calculates the temperature difference based on the temperature difference. The magnitude of the heat load at each individual measurement point is determined. In other words, a plurality of individual load detecting means for detecting individual heat loads at the plurality of individual measurement points are constituted by the individual temperature sensors T1 to T4.

The control means 100 determines the combustion state of the four burners 4 in the combustion control pattern in accordance with the heat load at the plurality of load measurement points (the installation positions of the temperature sensors TM, T1 to T4). Is changed and adjusted for each burner 4. That is, the control means 1
00 sets the combustion control pattern based on the detection information of the master temperature sensor TM, and controls the four burners 4 based on the detection information of each of the plurality of individual temperature sensors T1 to T4. The combustion state of the burner 4 associated with each individual measurement point in the combustion control pattern is changed and adjusted.

The setting of the combustion control pattern and the adjustment of the combustion state of each burner 4 will be described. Temperature controller 71
Determines that the larger the deviation between the detection temperature Pv0 of the master temperature sensor TM and the target temperature SP is, the greater the thermal load of the entire furnace is, and outputs a large temperature control output signal, and the pattern setting unit 72 is configured to set the combustion control pattern based on a temperature control output signal from the temperature controller 71. This combustion control pattern is set as a pattern that is repeated every set cycle time Cs, as shown in FIG.
s is set to be shorter as the temperature control output signal is larger. Specifically, a reference combustion time t0 (for example, 10 seconds) of each burner 4 is set in advance, and is set by dividing the reference combustion time t0 by the temperature control output (%) as in the following equation. The cycle time Cs is obtained. However,
When the temperature control output is small and the set cycle time Cs is longer than the longest cycle time (for example, 60 seconds), the longest cycle time is set.

[0024]

## EQU1 ## Cs = (t0 / temperature control output (%)) × 100

Further, the combustion control unit 73 determines the temperature of each of the individual temperature sensors T1 to T4 and the detected temperature Pv0 of the master temperature sensor TM in accordance with each heat load determined by the temperature difference between the burner 4 and the burner 4. The combustion time tn (n = 1 to 4) within the cycle time Cs is adjusted. Specifically, the individual temperature sensor T is calculated based on the temperature detected by the master temperature sensor TM.
In the case where the temperature difference obtained by subtracting the detected temperature of 1 is positive, as the temperature difference becomes larger, the combustion time t1 of the burner 4a associated with the individual temperature sensor T1 is set to the reference combustion time t0.
In contrast, when the temperature difference is negative, the combustion time t1 of the burner 4a is adjusted to be shorter than the reference combustion time t0 as the absolute value of the temperature difference increases. The combustion times of the other burners 4b to 4d are similarly adjusted according to the temperature difference obtained by subtracting the detected temperatures of the individual temperature sensors T2 to T4 from the detected temperatures of the master temperature sensor TM. With the above configuration, the control means 100 sets, as the combustion control pattern, a pattern that is repeated at a set cycle time Cs that is changed according to the reference heat load, and sets each of the patterns according to the individual heat load. The combustion state (specifically, the combustion time) of the burner 4 associated with the individual measurement point within the set cycle time Cs is changed and adjusted.

Next, the combustion control operation by the control device 7 will be described with reference to the flowchart shown in FIG.
First, a reference burner (for example, the burner 4b or 4c at a position close to the position of the master temperature sensor TM is set as a reference burner) is determined, and a reference combustion time t0 (for example, 10).
Seconds). Next, the temperature Pv0,
Pvn is detected, a temperature control output is determined from the reference measurement point temperature Pv0 and the target temperature SP, and a cycle time Cs is determined from the temperature control output and the reference combustion time t0. Next, the combustion ON time tn of each burner 4 is calculated by the following equation in a state that is proportional to the deviation of the temperature Pvn at each individual measurement point from the temperature Pv0 at the reference measurement point. In the formula,
The coefficient K is a value twice as large as the allowable temperature difference. For example, if the allowable temperature difference is 20 ° C., K = 40.

[0027]

## EQU2 ## tn = {(Pv0-Pvn) / K + 1} .times.t0

Next, the combustion ON time tn of each burner 4 obtained as described above is different from the upper limit 1.5t0 and the lower limit 0.5t0.
It is determined whether or not it is within a range of 0, and if it is within this range, the combustion ON time tn obtained as described above is directly used as the combustion ON time.
When the time exceeds the upper limit 1.5t0, the combustion ON time tn is set to the upper limit 1.5t0, and the lower limit 0.5t0.
If it is smaller than 0, the combustion ON time tn is set to its lower limit of 0.
Let it be 5t0. Further, it is determined whether or not the combustion ON time tn is longer than the set cycle time Cs.
If the combustion ON time tn is longer than the set cycle time Cs, the continuous combustion condition (combustion ON time tn = set cycle time Cs) is set. Hereinafter, the flow from the detection of the temperatures Pv0 and Pvn at each load measurement point is repeated.

[Second Embodiment] A second embodiment of the present invention will be described. In the second embodiment, in the combustion control, the determination of the reference burner and the setting of the combustion ON time tn of each burner 4 are different from those of the first embodiment except for the first burner.
The configuration is the same as that of the embodiment. That is, the control means 100 sets the burner 4 associated with the load measurement point having the largest thermal load among the plurality of individual measurement points as a reference burner, and sets the combustion state of the reference burner as the reference combustion state, and By changing the combustion state of the other burners 4 other than the reference burner to a smaller heat load than the reference combustion state, the combustion state of the plurality of burners 4 is adjusted according to the individual heat load. Is configured. Incidentally, the load measurement point having the largest heat load corresponds to the measurement point having the lowest detected temperature.

Specifically, the combustion control operation is performed based on a flowchart shown in FIG. 5 instead of FIG. 4 in the first embodiment. First, the combustion ON time tn of each burner 4
(For example, 10 seconds). Next, the temperatures Pv0 and Pvn at each load measurement point are detected, and the temperature Pv at the reference measurement point is detected.
The temperature control output is determined from v0 and the target temperature SP. Next, among the temperatures Pvn at the individual measurement points, the lowest temperature P
The combustion ON time tn of the burner 4 associated with the load measurement point of vn0 is set as the reference combustion time as the reference combustion state. Further, the cycle time Cs is determined from the temperature control output and the reference combustion time t0. Next, the combustion ON time tn as the combustion state of each burner 4 is determined by the lowest temperature P
In a state proportional to the deviation of the temperature Pvn at each individual measurement point with respect to vn0, it is calculated by the following equation. Note that the coefficient K in the equation is the same as the equation (2).

[0031]

Tn = {(Pvn0−Pvn) / K + 1} × t0

Next, it is determined whether or not the combustion ON time tn of each burner 4 obtained as described above is smaller than the lower limit value 0.5t0. The combustion ON time tn obtained above is directly used as the combustion ON time, and if it is smaller than the lower limit value 0.5t0, the combustion ON time
The time tn is set to the lower limit value 0.5t0. In addition, this second
In the embodiment, the combustion ON time tn of each burner 4 is:
The adjustment is performed only in the direction shorter than the reference combustion time t0 (smaller heat load side), but not in the direction longer than the reference combustion time t0 (larger heat load side). Hereinafter, the flow from the detection of the temperatures Pv0 and Pvn at each load measurement point is repeated.

[Third Embodiment] A third embodiment of the present invention will be described. In the third embodiment, each of the plurality of individual measurement points and the plurality of burners 4 are configured in the same manner as the first and second embodiments, except that the association is different from the first and second embodiments. ing. Specifically, FIGS. 6 and 7
As shown in FIG. 7, in the third embodiment, a master temperature sensor TM is installed at a central position of the furnace 13 as in the first and second embodiments as a temperature sensor for detecting the temperature of the furnace 13. The two individual temperature sensors T5 and T6 are respectively installed in the middle of the flame injection directions of the two burners 4a and 4b, and 4c and 4d, of which the flame injection directions are adjacent to each other. I have. A plurality of individual measurement points are set corresponding to the positions of the two individual temperature sensors T5 and T6, and one of the individual temperature sensors T5
And the burner 4a and the burner 4b are associated with each other, and the other individual temperature sensor T6 is associated with the burner 4c and the burner 4d.

[Another Embodiment] Next, another embodiment will be described. In the first to third embodiments, the control means 10
0 is the combustion ON time tn as the combustion state of each burner 4
Was changed and adjusted based on the individual heat load at each reference measurement point, it was set in a state proportional to the deviation of the temperature Pvn at each individual measurement point from the temperature Pv0 at the reference measurement point. Alternatively, the deviation may be divided into classes in a plurality of stages and adjusted to a time determined for each class. Specifically, FIG. 8 shows a flow in which the flow after the calculation of each burner ON time in FIG. 4 of the first embodiment is replaced with the flow for classifying and processing.
Further, FIG. 9 shows the second embodiment in which the flow after the calculation of each burner ON time in FIG.

In the first to third embodiments, when the control means 100 sets the combustion control pattern based on the detection information of the reference load detection means (master temperature sensor TM), the control means 100 determines the combustion control pattern according to the reference heat load. Although the pattern to be repeated at the changed set cycle time is set, instead of this, the set cycle time is fixed to a predetermined value, and a plurality of burners 4 in the cycle are set according to the reference heat load. You may make it set the combustion control pattern changed so that each combustion time may become long.

In the first to third embodiments, when the combustion state in the combustion control pattern of the plurality of burners 4 is changed and adjusted for each burner, each burner 4 is switched between the combustion ON state and the combustion OFF state. The combustion ON time at this time is configured to be longer or shorter according to the heat load. However, instead of switching between the combustion ON state and the combustion OFF state, the amount of combustion is switched between strong and weak while performing continuous combustion. You may comprise so that it may be performed by switching of a strong combustion state.

In the first to third embodiments, the load detecting means TM, T1 to T6 for detecting the thermal load at a plurality of load measuring points distributed and set in the furnace 13 are provided, and the thermal load detection information is provided. Although the case where the combustion state of the plurality of burners 4 is changed and adjusted based on the above has been exemplified, the heat load at the plurality of load measurement points may be artificially input instead.

In the above-described first to third embodiments, the case where the heat load is adjusted so that the inside of the furnace 13 uniformly reaches the target temperature has been described as an example. The load may be adjusted so that the temperature distribution becomes as described above.

In the above embodiment, the processing object is arranged in the furnace 13 and the processing object in the furnace 13 is directly heated by the burner 4. However, the processing object is placed in the furnace 13 instead. By providing a muffle to be stored and heating the muffle from the outer periphery by the burner 4, the processed material in the muffle may be indirectly heated.

In the above embodiment, the case where the combustion apparatus of the present invention is applied to heating of a box type heat treatment furnace is exemplified. However, in addition to this, the present invention is applicable to a combustion apparatus for heating various furnaces. Can be. For example, the present invention can also be applied to a combustion apparatus that heats a continuous furnace provided with a conveyance unit that introduces a processed product into an oven from an inlet, passes through the oven, and discharges the outlet from an outlet.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of a combustion device according to a first embodiment.

FIG. 2 is a plan view of a heating furnace.

FIG. 3 is a diagram showing a time chart of a combustion operation.

FIG. 4 is a flowchart of combustion control.

FIG. 5 is a flowchart of combustion control in a second embodiment.

FIG. 6 is a block diagram showing an overall configuration of a combustion device according to a third embodiment.

FIG. 7 is a plan view of a heating furnace according to a third embodiment.

FIG. 8 is a flowchart of combustion control in another embodiment.

FIG. 9 is a flowchart of combustion control in another embodiment.

[Explanation of symbols]

 4 Burner 13 Furnace 100 Control means T1 to T6 Individual load detection means TM Reference load detection means

Claims (5)

[Claims] A plurality of burners for heating the inside of a furnace are provided in a distributed manner, and the combustion of the plurality of burners is controlled by a combustion control pattern that determines a combustion state of each of the plurality of burners with time. A combustion device provided with control means for controlling, the control means according to a heat load at a plurality of load measurement points set dispersed in the furnace, in the combustion control pattern of the plurality of burners. A combustion device configured to change and adjust the combustion state for each burner. 2. A reference load detecting means for detecting a reference heat load at a reference measurement point representing a total load in the furnace among the plurality of load measurement points, and a plurality of individual measurement points other than the reference measurement point. A plurality of individual load detecting means for detecting an individual heat load in the control unit, wherein the control means sets the combustion control pattern based on detection information of the reference load detecting means, and 2. The apparatus according to claim 1, wherein a combustion state in the combustion control pattern of the burner associated with each of the individual measurement points among the plurality of burners is changed and adjusted based on detection information of each of the detection units. 3. Combustion equipment. 3. The control means sets, as the combustion control pattern, a pattern that is repeated at a set cycle time that is changed according to the reference heat load, and the individual measurement is performed according to the individual heat load. 3. The combustion device according to claim 2, wherein the combustion state of the burner associated with the point is changed and adjusted within the set cycle time. 4. The control means sets a burner associated with a load measurement point having the largest heat load among the plurality of individual measurement points as a reference burner, and sets a combustion state of the reference burner as a reference combustion state, and The combustion state of the other burners other than the reference burner is changed to a smaller heat load than the reference combustion state, so that the combustion state of the plurality of burners is adjusted according to the individual heat load. 4. The combustion device according to claim 3, wherein the combustion device is configured. 5. The combustion apparatus according to claim 2, wherein an association between each of the plurality of individual measurement points and the plurality of burners is configured to be freely changeable.