KR102144172B1 - Apparatus and method for controlling combustion of blast furnace for optimization - Google Patents

Abstract

The present invention relates to an apparatus for controlling an optimization of a hot stove, comprising: an outside temperature detection unit that detects and transmits the outside temperature to a control unit; An exhaust gas temperature detection unit detecting the exhaust gas temperature discharged from the hot stove and transmitting it to the control unit; A blowing temperature detection unit for detecting the blowing temperature discharged from the hot stove to the blast furnace and transmitting it to the control unit; A fuel calorific value deriving unit for deriving a calorific value of fuel in the current combustion mode and transmitting the calorific value to the control unit; And the control unit calculating a fuel flow rate capable of optimizing the hot stove in response to a change in the calorific value of the hot stove based on the information received from the outside temperature detector, the exhaust gas temperature detector, the blowing temperature detector, and the fuel calorific value derivation unit. Include.

Description

Hot stove optimization control device and method {APPARATUS AND METHOD FOR CONTROLLING COMBUSTION OF BLAST FURNACE FOR OPTIMIZATION}

The present invention relates to a hot stove optimization control apparatus and method, and more particularly, to optimize a hot stove by appropriately controlling the flow rate of fuel in response to a change in the heating value of the hot stove. About.

In general, the blast furnace work, one of the iron making processes, is through a melting reduction process by charging iron ore and cokes into the blast furnace and blowing high-temperature hot air generated from the hot stove into the inside of the blast furnace through a fan formed on one side of the blast furnace. It is a process of producing molten iron.

At this time, the hot stove stores heat generated by combusting the mixture gas of blast furnace gas (BFG) and coke oven gas (COG) in the combustion chamber, and stores the heat generated in the heat storage chamber. It is a heat storage type heating furnace that continuously supplies heat.

The background technology of the present invention is disclosed in Korean Patent Registration No. 10-1388020 (2014.04.16., registration, combustion control method of a hot stove).

According to an aspect of the present invention, the present invention provides a hot stove optimization control apparatus and method for optimizing a hot stove by appropriately controlling a flow rate of fuel in response to a change in the calorific value of the hot stove.

An apparatus for controlling an optimization of a hot stove according to an aspect of the present invention includes: an outside temperature detection unit that detects and transmits the outside temperature to a control unit; An exhaust gas temperature detection unit detecting the exhaust gas temperature discharged from the hot stove and transmitting it to the control unit; A blowing temperature detection unit for detecting the blowing temperature discharged from the hot stove to the blast furnace and transmitting it to the control unit; A fuel calorific value deriving unit for deriving a calorific value of fuel in the current combustion mode and transmitting the calorific value to the control unit; And the control unit calculating a fuel flow rate capable of optimizing the hot stove in response to a change in the calorific value of the hot stove based on the information received from the outside temperature detector, the exhaust gas temperature detector, the blowing temperature detector, and the fuel calorific value derivation unit. It characterized in that it includes.

In the present invention, the control unit, according to the result of applying the standard deviation based on the accumulated calorific value data in the past, the average calorific value during the previously specified combustion time in the current combustion mode, as the current fuel calorific value (h _i ). It is characterized by setting.

A method for controlling a hot stove optimization according to another aspect of the present invention includes the steps of: detecting an outside temperature (T _o ) by a control unit of a hot stove optimization control apparatus; Calculating, by the control unit, a reference exhaust gas temperature for a heat recovery facility according to an outside temperature, and setting the exhaust gas lower limit reference temperature T _Li ; The control unit sets the exhaust gas lower limit reference temperature (T _Li ) to at least a reference temperature designated for stabilizing the heat storage body, and the exhaust gas upper limit reference temperature (T _Hi ) adds a temperature specified to the exhaust gas lower limit reference temperature (T _Li ). Setting by; Checking, by the control unit, whether the current exhaust gas temperature T _i is within a range of the set exhaust gas lower limit reference temperature T _Li and the exhaust gas upper limit reference temperature T _Hi ; When the current exhaust gas temperature (T _i ) is out of the range of the exhaust gas lower limit reference temperature (T _Li ) and the exhaust gas upper limit reference temperature (T _Hi ), the controller causes the current exhaust gas temperature (T _i ) to be the exhaust gas lower limit reference temperature Checking whether a value is smaller than (T _Li ) or larger than the exhaust gas upper limit reference temperature (T _Hi ); If the current exhaust gas temperature (T _i ) is greater than the exhaust gas upper limit reference temperature (T _Hi ), the input heat amount (H _i ) of the hot stove is set as small as the specified amount of heat, and the current exhaust gas temperature (T _i ) is the exhaust gas lower limit If it is less than the reference temperature (T _Li ), setting the input heat amount (H _i ) of the hot stove to be larger by the specified amount of heat; Deriving, by the control unit, a current fuel calorific value (h _i ); And a step of calculating the current input amount of heat (H _i) for the current fuel heating value (h _i) by dividing the current fuel flow rate _{(Q i = H i / h} i) to control the control unit is set the control for a hot-air; including Characterized in that.

In the present invention, the step of checking whether the current exhaust gas temperature (T _i ) is a value smaller than the exhaust gas lower limit reference temperature (T _Li ) or greater than the exhaust gas upper limit reference temperature (T _Hi ), the exhaust gas lower limit The difference between the reference temperature (T _Li ) and the current exhaust gas temperature (T _i ) (ΔT=T _Li -T _i ) and the difference between the exhaust gas upper limit reference temperature (T _Hi ) and the current exhaust gas temperature (T _i ) ( Calculating ΔT=T _i -T _Hi ); And checking whether the calculated difference value (ΔT) is greater than or less than 0.

In the present invention, when the difference value (ΔT) is greater than 0, it means that the current exhaust gas temperature (T _i ) is greater than the exhaust gas upper limit reference temperature (T _Hi ), and the difference value (ΔT) is less than 0 If, it is characterized in that the current exhaust gas temperature (T _i ) is less than the exhaust gas upper limit reference temperature (T _Hi ).

In the present invention, by calculating the heat recovery equipment based on the exhaust gas temperature according to the outside temperature, the exhaust gas lower reference temperature (T _Li) in the step to set the exhaust gas lower reference temperature (T _Li) is arranged according to the outside temperature It is characterized in that it is the exhaust gas temperature of the hot stove, which is a standard for preventing the acid dew point of the recovery facility.

In the present invention, the step of setting the exhaust gas lower limit reference temperature (T _Li ) to at least a reference temperature designated for stabilization of the heat storage body, the exhaust gas temperature of the heat recovery facility according to the outside temperature, for stabilizing the heat storage body When it is less than the specified reference temperature, the control unit is characterized in that the exhaust gas lower limit reference temperature (T _Li ) is set to at least a reference temperature designated for stabilizing the heat storage body.

In the present invention, the step of setting the exhaust gas upper limit reference temperature (T _Hi ) by adding a specified temperature to the exhaust gas lower limit reference temperature (T _Li ) is when the current blowing temperature (B _i ) is not the designated reference temperature The control unit sets the exhaust gas lower limit reference temperature T _Li using the exhaust gas reference temperature calculation formula (T _Li =T _Li + (B _i -1,200) * 0.25) according to the current blowing temperature (B _i ), and , The exhaust gas upper limit reference temperature (T _Hi ) is set by adding a predetermined temperature to the calculated exhaust gas lower limit reference temperature (T _Li ), and the specified reference temperature compared with the current blowing temperature (B _i ) is As a reference blowing temperature for managing the exhaust gas temperature for each temperature, the control unit applies the arithmetic expression "exhaust gas reference temperature = 1200°C of blowing temperature reference exhaust gas reference temperature + (blowing temperature-reference blowing temperature) * 0.25" to the blowing temperature. It characterized in that the exhaust gas reference temperature is calculated.

According to an aspect of the present invention, the present invention has an effect of reducing fuel consumption and carbon dioxide generation by allowing the hot stove to be optimized through appropriate control of the fuel flow rate in response to a change in the amount of heat generated by the hot stove.

1 is an exemplary view showing a schematic configuration of a hot stove optimization control apparatus according to an embodiment of the present invention.
2 is a flowchart illustrating a method of controlling optimization of a hot stove according to an embodiment of the present invention.
FIG. 3 is an exemplary view showing a hot stove exhaust gas temperature table as a reference for preventing acid dew points of a heat recovery facility according to the outside air temperature in FIG. 2;
4 is an exemplary view in the form of a graph showing exhaust gas temperature data based on temperature of a heat storage body in a plurality of hot stoves in FIG. 2.
FIG. 5 is an exemplary view showing accumulated calorific value data in a combustion mode for deriving the current fuel calorific value in a graph form in FIG. 2.

Hereinafter, an embodiment of a hot stove optimization control apparatus and method according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention and may vary according to the intention or custom of users or operators. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

1 is an exemplary view showing a schematic configuration of a hot stove optimization control apparatus according to an embodiment of the present invention.

As shown in Figure 1, the hot stove optimization control apparatus according to the present embodiment, the outside temperature detection unit 110, the exhaust gas temperature detection unit 120, the blowing temperature detection unit 130, the fuel calorific value derivation unit 140, the control unit 150, and a fuel flow rate control unit 160.

The outside temperature detection unit 110 detects (measures) the outside temperature and transmits it to the control unit 150.

The exhaust gas temperature detection unit 120 detects the exhaust gas temperature discharged from the hot stove and transmits it to the control unit 150.

The blowing temperature detection unit 130 detects the blowing temperature discharged from the hot stove to the blast furnace and transmits it to the control unit 150.

The fuel calorific value derivation unit 140 derives the fuel calorific value in the current combustion mode and transmits it to the control unit 150.

The control unit 150 responds to changes in the amount of heat generated by the hot stove based on information transmitted from the outside temperature detection unit 110, the exhaust gas temperature detection unit 120, the blowing temperature detection unit 130, and the fuel calorific value derivation unit 140. Thus, the fuel flow rate that can optimize the hot stove is calculated.

The fuel flow rate control unit 160 adjusts the fuel flow rate in the combustion mode of the hot stove with the fuel flow rate calculated by the control unit 150.

Hereinafter, a method of calculating the fuel flow rate by the control unit 150 will be described in more detail with reference to the flowchart of FIG. 2.

Hereinafter, the unit of temperature may be described by mixing “degrees” and “℃” for convenience.

2 is a flowchart illustrating a method of controlling optimization of a hot stove according to an embodiment of the present invention.

As shown in Figure 2, the control unit 150 detects the outside temperature (T _o ) (S101).

In addition, the control unit 150 calculates a reference exhaust gas temperature for a heat recovery facility (eg, a heat exchanger) and sets the exhaust gas lower limit reference temperature T _Li (S102).

Here, the reference exhaust gas temperature of the heat recovery facility (eg, a heat exchanger) means the exhaust gas temperature of the hot stove, which is a reference for preventing the acid dew point of the heat recovery facility, as shown in FIG. 3.

FIG. 3 is an exemplary view showing a hot stove exhaust gas temperature table as a reference for preventing acid dew points of a heat recovery facility according to the outside air temperature in FIG. 2.

For example, referring to FIG. 3, when the outside air temperature is "-10 to 5 degrees (less than)", the exhaust gas temperature of the hot stove, which is the standard for preventing the acid dew point of the heat recovery facility, is the exhaust gas temperature at the outlet of the waste heat recovery facility. It should be "minimum 130 degrees to maximum 132 degrees", and for this, the exhaust gas temperature (maximum) at the entrance to the waste heat recovery facility should be "minimum 313 degrees to the maximum degree". That is, when the outside temperature is "-10 ~ 5 degrees (less than)", the exhaust gas temperature of the hot stove, which is the standard for preventing the acid dew point of the heat recovery facility, must be "minimum 313 degrees to maximum 323 degrees" State.

At this time, the exhaust gas temperature of the hot stove, which is the standard for preventing the acid dew point of the heat recovery facility according to the outside air temperature, is an arithmetic expression designated by the outlet exhaust gas temperature of the waste heat recovery facility, as shown in the table shown in FIG. It can be calculated by substituting in.

The arithmetic expression is calculated based on the accumulated steel process information.

However, in order to protect the internal heat storage body of the hot stove under the constraints at this time, the exhaust gas temperature must be at least 300 degrees, as shown in FIG. 4.

4 is an exemplary view in the form of a graph showing exhaust gas temperature data based on the temperature of a heat storage body in a plurality of hot stoves in FIG. 2, and this graph is a plurality of hot stoves (eg No. 1, No. 2, No. 3) This is to check the temperature of the exhaust gas for maintaining the heat storage body in a stable state, and although there is a slight difference for each hot stove, it can be seen through an experiment that it maintains a stable state when it is at least 300 degrees Celsius.

Therefore, in the case of combining FIGS. 3 and 4, the exhaust gas temperature of the hot stove, which is the standard for preventing the acid dew point of the heat recovery facility, is controlled to be the exhaust gas temperature shown in the table of FIG. 3 above 300 degrees. And, when the exhaust gas temperature shown on the table is less than 300 degrees, it should be controlled to be at least 300 degrees, which is the stabilization temperature of the heat storage body.

Accordingly, referring again to FIG. 2, the controller 150 checks whether the exhaust gas lower limit reference temperature T _Li is 300 degrees or more (S103).

If the exhaust gas lower limit reference temperature (T _Li ) is not more than 300 degrees (No in S103), it is checked whether the current blowing temperature (B _i ) is a designated reference temperature (eg, 1,200 degrees) (that is, the reference blowing temperature). (S104).

Here, the specified reference temperature (eg, 1,200 degrees) (ie, the reference blowing temperature) is a reference blowing temperature for managing the exhaust gas temperature for each blowing temperature, and based on this, an arithmetic expression “exhaust gas reference temperature = 1200° C. By applying the exhaust gas reference temperature (ie, 280°C) + (blowing temperature -1200°C) *0.25", the exhaust gas reference temperature according to the blowing temperature can be calculated.

In the above arithmetic equation, the constant (eg 0.25) is calculated based on "The amount of heat storage variation for fluctuating the exhaust gas temperature 1℃: 1Gcal" and "The amount of heat storage fluctuation when the blowing temperature fluctuates 1℃: 0.25Gcal" Means fluctuation temperature of flue gas required for fluctuations, and the "fluctuation temperature of flue gas required for fluctuations of 1℃ of blowing temperature" means "1℃ flue gas/1Gcal * 0.25Gcal/1℃(ventilation) = 0.25℃(flue gas)/1℃ It is a value calculated through the arithmetic expression of "(blowing)".

If the current blowing temperature (B _i ) in the step S104 is not the specified reference temperature (eg, 1,200 degrees) (No in S104), the exhaust gas reference temperature calculation formula (i.e., T) according to the current blowing temperature (B _i ) _Li =T _Li + (B _i -1,200) * 0.25) to set the exhaust gas lower limit reference temperature (T _Li ) (that is, the minimum value) (S105).

In addition, the exhaust gas upper limit reference temperature T _Hi (ie, the maximum value) is set by adding a predetermined temperature (eg, 5° C.) to the exhaust gas lower limit reference temperature T _Li (ie, the minimum value) (S109).

That is, the exhaust gas lower limit reference temperature T _Li and the exhaust gas upper limit reference temperature T _Hi refer to the minimum and maximum values described with reference to FIG. 3.

On the other hand, if the current blowing temperature (B _i ) in the step S104 is the specified reference temperature (eg, 1,200 degrees) (Yes in S104), the exhaust gas lower limit reference temperature (T _Li ) (that is, the minimum value) is used to stabilize the heat storage body. It is set to a temperature for (ie, 300°C) (S108). In addition, the exhaust gas upper limit reference temperature T _Hi (ie, the maximum value) is set by adding a predetermined temperature (eg, 5° C.) to the exhaust gas lower limit reference temperature T _Li (ie, 300° C.) (S109).

In addition, if the exhaust gas lower limit reference temperature (T _Li ) in step S103 is more than 300 degrees (Yes in S103), whether the current blowing temperature (B _i ) is the designated reference temperature (eg, 1,200 degrees) (i.e., the reference blowing temperature). Check (S106).

If the current blowing temperature (B _i ) in step S106 is not the specified reference temperature (eg, 1,200 degrees) (ie, the reference blowing temperature) (No in S104), the exhaust gas standard according to the current blowing temperature (B _i ) The exhaust gas lower limit reference temperature (T _Li ) (that is, the minimum value) is set using a temperature calculation formula (ie, T _Li =T _Li + (B _i −1,200) * 0.25) (S107).

In addition, the exhaust gas upper limit reference temperature T _Hi (ie, the maximum value) is set by adding a predetermined temperature (eg, 5° C.) to the exhaust gas lower limit reference temperature T _Li (ie, the minimum value) (S109).

Next, the control unit 150 is the range of the exhaust gas lower limit reference temperature T _Li (ie, the minimum value) and the exhaust gas upper limit reference temperature (T _Hi ) (ie, the maximum value) set by the current exhaust gas temperature T _i It checks whether it is in the inside (S110).

In the step S110, if the current exhaust gas temperature T _i is within the range of the minimum and maximum values (No in S110), the current exhaust gas temperature T _i is in a normal state, so the next check routine (i.e., again after a certain time) Repeat routine to check the exhaust gas temperature) is performed.

However, if the current exhaust gas temperature (T _i ) is out of the range of the minimum value (T _Li ) and the maximum value (T _Hi ) in step S110 (Yes in S110), the current exhaust gas temperature (T _i ) is in an abnormal state. , The difference between the minimum value (T _Li ) and the current exhaust gas temperature (T _i ) (ΔT = T _Li -T _i ), and the difference between the maximum value (T _Hi ) and the current exhaust gas temperature (T _i ) (ΔT =T _i -T _Hi ) is calculated (S111).

Then, it is checked whether the calculated difference value ΔT is greater than 0 (S112).

That is, it is checked whether the current exhaust gas temperature T _i is a value less than the minimum value T _Li or a value greater than the maximum value T _Hi .

As a result of the check in step S112, if the difference value (ΔT) is greater than 0 (that is, if it is greater than the maximum value (T _Hi )) (Yes in S112), the input heat amount (H _i ) of the hot stove is designated as the designated heat amount ( Example: 0.6Gcal) is set to decrease (S113).

Meanwhile, as a result of the check in step S112, if the difference value (ΔT) is less than 0 (i.e., less than the minimum value (T _Li )) (No in S112), the input heat quantity (H _i ) of the hot stove is specified (Ex: 0.6Gcal) is set to increase (S114).

In addition, the control unit 150 derives the current fuel calorific value h _i (eg, the average calorific value for the previous 40 minutes from the present) (S115).

Here, the current fuel calorific value (h _i ) (eg, the average calorific value of the previous 40 minutes from the present) is a standard deviation based on data accumulated in the past (eg, for 16 years), as shown in FIG. Depending on the result of applying, the average of the calorific value during the previous designated combustion time (eg 40 minutes) in the current combustion mode is set as the current fuel calorific value (h _i ).

FIG. 5 is an exemplary diagram showing accumulated calorific value data in a combustion mode for deriving the current fuel calorific value in a graph form in FIG. 2.

Accordingly, the control unit 150 calculates a fuel flow rate to be adjusted (Q _i =H _i /h _i ) by dividing the set current input heat quantity H _i by the current fuel heating value h _i (S116).

Therefore, the control unit 150 controls the hot stove with the calculated fuel flow rate Q _i =H _i /h _i to optimize the hot stove.

As described above, the processes (S101 to S116) perform an iterative routine at regular time intervals (S117).

As described above, the present embodiment has an effect of reducing fuel consumption and carbon dioxide generation by allowing the hot stove to be optimized through appropriate control of the fuel flow rate in response to changes in the amount of heat generated by the hot stove.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but this is only exemplary, and various modifications and other equivalent embodiments are possible from those of ordinary skill in the field to which the technology belongs. I will understand the point. Therefore, the technical protection scope of the present invention should be determined by the following claims.

110: outside temperature detection unit
120: exhaust gas temperature detection unit
130: blowing temperature detection unit
140: fuel heating amount derivation unit
150: control unit
160: fuel flow control unit

Claims (8)

An outside temperature detection unit detecting the outside temperature and transmitting it to the control unit;
An exhaust gas temperature detection unit detecting the exhaust gas temperature discharged from the hot stove and transmitting it to the control unit;
A blowing temperature detection unit for detecting the blowing temperature discharged from the hot stove to the blast furnace and transmitting it to the control unit;
A fuel calorific value deriving unit for deriving a calorific value of fuel in the current combustion mode and transmitting the calorific value to the control unit; And
The control unit for calculating a fuel flow rate capable of optimizing the hot stove in response to a change in the calorific value of the hot stove based on the information received from the outside temperature detector, the exhaust gas temperature detector, the blowing temperature detector, and the fuel calorific value derivation unit; Hot stove optimization control device, characterized in that.
The method of claim 1, wherein the control unit,
According to the result of applying the standard deviation based on the accumulated calorific value data in the past,
A hot stove optimization control apparatus, characterized in that, in the current combustion mode, an average of the calorific value during a previously designated combustion time is set as the current fuel calorific value (h _i ).
Detecting, by a control unit of the hot stove optimization control apparatus, an outside temperature (T _o );
Calculating, by the control unit, a reference exhaust gas temperature for a heat recovery facility according to an outside temperature, and setting the exhaust gas lower limit reference temperature T _Li ;
The control unit sets the exhaust gas lower limit reference temperature (T _Li ) to at least a reference temperature designated for stabilizing the heat storage body, and the exhaust gas upper limit reference temperature (T _Hi ) adds a temperature specified to the exhaust gas lower limit reference temperature (T _Li ). Setting by;
Checking, by the control unit, whether the current exhaust gas temperature T _i is within a range of the set exhaust gas lower limit reference temperature T _Li and the exhaust gas upper limit reference temperature T _Hi ;
When the current exhaust gas temperature (T _i ) is out of the range of the exhaust gas lower limit reference temperature (T _Li ) and the exhaust gas upper limit reference temperature (T _Hi ), the controller causes the current exhaust gas temperature (T _i ) to be the exhaust gas lower limit reference temperature Checking whether a value is smaller than (T _Li ) or larger than the exhaust gas upper limit reference temperature (T _Hi );
If the current exhaust gas temperature (T _i ) is greater than the exhaust gas upper limit reference temperature (T _Hi ), the input heat amount (H _i ) of the hot stove is set as small as the specified amount of heat, and the current exhaust gas temperature (T _i ) is the exhaust gas lower limit If it is less than the reference temperature (T _Li ), setting the input heat amount (H _i ) of the hot stove to be larger by the specified amount of heat;
Deriving, by the control unit, a current fuel calorific value (h _i ); And
The input current is the control section set the amount of heat above the (H _i) by dividing the current fuel heating value (h _i) calculating the current fuel flow rate _{(Q i = H i / h} i) control step of controlling a hot-air; containing Hot stove optimization control method, characterized in that.
The method of claim 3, wherein the step of checking whether the current exhaust gas temperature (T _i ) is a value smaller than the exhaust gas lower limit reference temperature (T _Li ) or greater than the exhaust gas upper limit reference temperature (T _Hi ),
The difference between the exhaust gas lower limit reference temperature (T _Li ) and the current exhaust gas temperature (T _i ) (ΔT=T _Li -T _i ), and between the exhaust gas upper limit reference temperature (T _Hi ) and the current exhaust gas temperature (T _i ) Calculating a difference value (ΔT=T _i -T _Hi ); And
And checking whether the calculated difference ΔT is greater than or less than 0.
The method of claim 4,
If the difference value (ΔT=T _i -T _Hi ) between the exhaust gas upper limit reference temperature (T _Hi ) and the current exhaust gas temperature (T _i ) is greater than 0, the current exhaust gas temperature (T _i ) is the exhaust gas upper limit reference temperature ( T _Hi ) means greater than,
If the difference (ΔT=T _i -T _Hi ) between the exhaust gas upper limit reference temperature (T _Hi ) and the current exhaust gas temperature (T _i ) is less than 0, the current exhaust gas temperature (T _i ) is the exhaust gas upper limit reference temperature (T _Hi ) a method of controlling optimization of a hot stove, characterized in that it is less than.
The method of claim 3,
In the step of calculating the exhaust gas temperature of the heat recovery facility according to the outside temperature and setting the exhaust gas lower limit reference temperature (T _Li ),
The exhaust gas lower limit reference temperature (T _Li ) is,
A hot stove optimization control method, characterized in that it is the exhaust gas temperature of the hot stove that serves as a reference for preventing the acid dew point of the heat recovery facility according to the outside air temperature.
The method of claim 3, wherein the step of setting the exhaust gas lower limit reference temperature T _Li to at least a reference temperature designated for stabilizing the heat storage body or higher,
When the reference exhaust gas temperature of the heat storage facility according to the outside temperature is less than the reference temperature designated for stabilizing the heat storage body,
Wherein the control unit sets the exhaust gas lower limit reference temperature (T _Li ) to at least a reference temperature designated for stabilizing the heat storage body.
The method of claim 3, wherein the step of setting the exhaust gas upper limit reference temperature (T _Hi ) by adding a specified temperature to the exhaust gas lower limit reference temperature (T _Li ),
When the current blowing temperature (B _i ) is not the specified reference temperature, the control unit calculates the exhaust gas reference temperature according to the current blowing temperature (B _i ) (T _Li =T _Li + (B _i -1,200) *0.25 ) To set the exhaust gas lower limit reference temperature (T _Li ), and the exhaust gas upper limit reference temperature (T _Hi ) is set by adding a predetermined temperature to the calculated exhaust gas lower limit reference temperature (T _Li ),
The specified exhaust gas reference temperature compared with the current blowing temperature (B _i ) is,
As a standard blowing temperature for managing exhaust gas temperature by blowing temperature,
The control unit calculates the exhaust gas reference temperature according to the blowing temperature by applying the arithmetic expression "exhaust gas reference temperature = 1200 °C of blowing temperature reference exhaust gas reference temperature + (blowing temperature-reference blowing temperature) * 0.25" Optimization control method.

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