KR101044975B1 - Method and apparatus for controlling temperature in combustion chamber - Google Patents

Abstract

Here, the temperature control method of the secondary combustion chamber in an incinerator is disclosed. The disclosed method comprises the steps of: measuring temperature at various locations in a particular section of the secondary combustion chamber; and based on the measured temperature, finding a target location having the largest temperature deviation from the average temperature among the various locations; And adjusting the temperature of the target location to be close to the average temperature.

Incinerator, Secondary, Combustion Chamber, Temperature, Measurement, Average, Target

Description

METHOD AND APPARATUS FOR CONTROLLING TEMPERATURE IN COMBUSTION CHAMBER}

The present invention relates to a temperature control method and apparatus in a combustion chamber, and more particularly, to a temperature control method and apparatus well suited for uniformly controlling the temperature of a secondary combustion chamber in an incinerator.

1 is a view for explaining a general incinerator structure as an example. Referring to FIG. 1, an incinerator includes a primary combustion chamber 2, a secondary combustion chamber 4, and a boiler 6. The incinerator is also provided with an inlet 7 for waste, an outlet 8 for incineration ash, and an exhaust port 9 for combustion gas. The injected waste is sequentially processed via the primary combustion chamber 2 and the secondary combustion chamber 4. The incineration ash remaining after the treatment is discharged to the outside through the discharge port 8, and the combustion gas is discharged to the outside through the discharge port 9.

Pollutants emitted to the atmosphere during waste incineration are determined by the operation of incinerators including primary and secondary combustion chambers and by the method of removing pollutants from flue gas treatment plants. At present, the method applied to most incineration systems is operated to maintain the outlet temperature in the secondary combustion chamber at 850 ° C or more for 2 seconds or more, and to reduce the pollutants through the complete combustion in the incinerator. The driving method is not applied.

Pollutants emitted to the atmosphere from incinerators include dust, NOx and carbon monoxide. Excessive dust emissions can increase the load on the dust collector and act as a catalyst for the dioxin resynthesis reaction. In addition, a large cost can be wasted in treating the dust (classified as designated waste) collected in the dust collector. NOx is decomposed in the SCR facility, which is a nitrogen oxide reduction facility among the flue gas treatment plants. When the amount of NOx is increased, the consumption of chemicals such as ammonia or urea, which is a reducing agent supplied to the SCR, is increased and the life of the catalyst is shortened. Carbon monoxide is used as an indicator for determining whether the waste is completely burned, and when a large amount of carbon monoxide is emitted, a large amount of dioxin, a toxic organic substance, is also likely to be emitted.

Techniques related to or ameliorating the above conventional problems are disclosed in Korean Patent No. 267146, Korean Patent No. 0705204, US49570050, US5230293, and the like. The above documents are incorporated herein by reference.

Through the uniform velocity distribution, the uniform temperature distribution, and the uniform distribution of chemical species (eg, oxygen concentration) in the secondary combustion chamber of the incinerator, the above-described problems of the related art may be solved. For such uniformity of distribution of velocity, temperature or species, it will be required to evaluate the distribution of velocity, temperature and species concentration in the secondary combustion chamber in the incinerator design. For such evaluation, computational fluid dynamics analysis software or the like may be used, and the flow field analysis using such software may determine the shape of the incinerator or the method of supplying combustion air.

In the past, it has been considered to uniformize the temperature and speed distribution in the secondary combustion chamber only in the design of the incinerator, but in practice, monitoring or operation to uniform the speed, temperature and species distribution in the secondary combustion chamber during the operation of the incinerator. No method has been suggested.

One technical problem of the present invention is to provide a method and apparatus for monitoring a temperature in a combustion chamber (especially a secondary combustion chamber in an incinerator) and uniformly controlling the temperature in the combustion chamber based on the monitored result.

Another technical problem of the present invention is to provide a method and an apparatus for controlling the temperature in the secondary combustion chamber uniformly based on the monitored result by monitoring the temperature in the secondary combustion chamber widely during actual incinerator operation.

According to an aspect of the present invention, there is provided a temperature control method of a secondary combustion chamber in an incinerator, the temperature control method comprising the steps of: (a) measuring the temperature at various locations in a particular section of the secondary combustion chamber, (b) finding a target position having the largest temperature deviation from the average temperature among the various positions based on the measured temperature, and (c) adjusting the temperature of the target position to be close to the average temperature. .

According to an embodiment, the step (a) may measure the temperature using a plurality of thermocouples arranged in a row in a specific cross section of the secondary combustion chamber.

According to an embodiment, step (c) may be performed by adjusting the amount of combustion air at the target position or a position adjacent thereto.

According to an embodiment, when the temperature of the target location found in the step (b) is lower than the average temperature, the step (c) increases the supply amount of combustion air to the target location or a location adjacent thereto. Evaluating whether the temperature of the target location increases with increasing supply of the combustion air, and when the temperature of the target location increases, the temperature for the combustion until the target temperature approaches the average temperature. Continue to increase the supply of air.

According to an embodiment, when the temperature of the target location found in the step (b) is higher than the average temperature, the step (c) reduces the supply amount of combustion air to the target location or a location adjacent thereto. Evaluating whether the temperature of the target location decreases as the supply amount of the combustion air decreases, and when the temperature of the target location decreases, the temperature for the combustion until the target temperature approaches the average temperature. Continue to reduce the air supply.

In the above embodiments, when the temperature standard deviation of the target position is within a predetermined allowable range, it is preferable to determine that the temperature of the target position is close to the average temperature.

In the above embodiments, it is preferable to change the rate of adjustment of the supply amount of air for combustion in accordance with the decrease in the temperature standard deviation.

According to an exemplary embodiment, the step (b) may calculate a standard deviation of the various positions in order to find a position having the largest temperature deviation, and determine a position having the largest standard deviation as a target position.

According to an embodiment, the step (c) may be performed by adjusting the amount of air using at least one air nozzle close to the target position among the air nozzles on the left and right sides of the secondary combustion chamber, wherein the target position is When relatively far from the left and right air nozzles in the middle of the secondary combustion chamber, the air volume of the target position is determined by using air nozzles close to the position where the temperature deviation is severe among the temperature measurement positions adjacent to the target position. I can regulate it.

According to an embodiment, the step (a) measures the temperature of the various positions from the thermocouples arranged in three rows and three columns in a specific cross section of the secondary combustion chamber, and the step (b) indicates that the measured temperature is the average The position of the thermocouple having the largest deviation with respect to temperature is determined as the target position, and the step (c) is performed by using the at least one air nozzle selected from two sets of air nozzles installed on both left and right sides of the secondary combustion chamber. Adjust the combustion air supply to the location.

In this case, when the position of one of the thermocouples in the second column of the three thermocouples arranged in the third row and the third column is determined as the target position, among the thermocouple positions in the first column and the third column, the deviation of the average temperature is larger It is preferable to select the left or right air nozzles adjacent to the thermocouple, and use the selected air nozzles to adjust the amount of combustion air supply at the target position.

According to another aspect of the invention, there is provided a temperature control device for a secondary combustion chamber in an incinerator. The temperature control device includes a plurality of thermocouples for measuring temperature at various locations in a particular section of the secondary combustion chamber, and based on the measured temperature, the temperature deviation from the average temperature among the various locations is greatest. And temperature adjusting means for finding a target position and adjusting the temperature of the target position to be close to the average temperature.

According to one embodiment, the temperature control means, the air supply having a plurality of air nozzles installed in the secondary combustion chamber to supply the air for combustion to the various positions, and the specific on the basis of the measured temperature And a calculation unit for calculating an average temperature of a section and a standard deviation of each of the various positions, and an air amount control unit controlling the air supply unit to adjust a supply amount of combustion air to a specific position having the largest standard deviation.

According to one embodiment, the plurality of thermocouples are arranged in rows in a specific cross section of the secondary combustion chamber. More preferably, the plurality of thermocouples are arranged in three rows and three columns in a specific cross section of the secondary combustion chamber.

According to another aspect of the present invention, by finding the position with the largest deviation from the average temperature from the temperature measured from the various positions of the combustion chamber, by adjusting the amount of supply of combustion air to the found position, reducing the deviation A temperature control method of a combustion chamber is provided.

The advantages obtained by uniforming the temperature in the combustion chamber (particularly in the incinerator) of the secondary combustion chamber are:

① Uniform temperature distribution → Minimize incomplete combustion area by equalizing combustion area in secondary combustion chamber. For reference, the advantages obtained by the uniformity of the velocity and chemical species distribution in the secondary combustion chamber is as follows.

② Uniform velocity distribution → Reduces carryover of dust by minimizing the size of the recycle zone.

③ Uniform distribution of chemical species (eg oxygen concentration) → Uniform combustion of oxygen in the incinerator secondary combustion chamber

Contaminant reduction control through uniformity of temperature distribution is advantageous over pollutant reduction control through uniformity of rate or species distribution, because it is possible to measure continuously compared to species such as rate and oxygen concentration. It is because it is easier and more economical to control the temperature of a combustion chamber (especially the secondary combustion chamber of an incinerator) more easily and economically since temperature is made into a measurement object. Instruments that can continuously measure the velocity and species distribution of the combustion chamber are expensive, and if such measuring instruments are installed, they cause complex incinerator systems.

According to the present invention, the temperature deviation (or temperature standard deviation) at each position can be obtained from the temperature measured by a plurality of thermocouples installed in the secondary combustion chamber during the operation of the incinerator, so as to reduce the temperature deviation. The following effects can be obtained by controlling the secondary combustion air.

First, by increasing the temperature uniformity in the secondary combustion chamber, it is possible to prevent the formation of local high temperature region or low temperature region, and to suppress the generation of secondary pollutants in the incinerator through complete combustion in the incinerator. .

By suppressing the generation of secondary pollutants in the incinerator, it is possible to reduce the pollutant treatment load in the flue gas treatment system connected to the rear end of the incinerator, thereby reducing the operating cost of the flue gas treatment system.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples to ensure that the spirit of the present invention to those skilled in the art will fully convey. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the width, length, thickness, etc. of the components may be exaggerated for convenience. Like numbers refer to like elements throughout.

FIG. 2 is a view showing an arrangement of an incinerator and thermocouples in a secondary combustion chamber of the incinerator, and FIG. 3 is a view illustrating a supply structure of primary combustion air and secondary combustion air in an incinerator.

As shown in Figs. 2 and 3, the incinerator of this embodiment includes a primary combustion chamber 2, a secondary combustion chamber 4 and a boiler 6. The incinerator is also provided with an inlet 7 for waste, an outlet 8 for incineration ash, and an exhaust port 9 for combustion gas. The injected waste is sequentially processed via the primary combustion chamber 2 and the secondary combustion chamber 4. The incineration ash remaining after the treatment is discharged to the outside through the discharge port 8, and the combustion gas is discharged to the outside through the discharge port 9.

Referring to FIG. 2, a plurality of thermocouples T (nine in this embodiment) are arranged in a matrix arrangement (three rows and three columns in this embodiment) in a specific cross section of the secondary combustion chamber. At this time, the reason why the thermocouples (T) are arranged in a specific cross section of the secondary combustion chamber (4) is to reduce the error due to the difference in the installation height of the thermocouple (T). It is most desirable that all of the thermocouples T be arranged in a certain arrangement on a specific cross section, but due to various circumstances it is also possible to install the thermocouples T with a slight height difference, even in this case, Beyond a certain height range should be avoided. The matrix arrangement is intended to measure the thermocouples T wide and unbiased to one side of the temperature.

3 includes an air supply unit 10 for supplying primary combustion air to the primary combustion chamber and another air supply unit 20 for supplying secondary combustion air to the secondary combustion chamber. As will be described below, the embodiment of the present invention uses the air supply unit 20 for supplying air to various locations in the secondary combustion chamber for the temperature uniformity of the secondary combustion chamber, the term 'air' used in the description of the following embodiments The supply section will be used only to supply air to the secondary combustion chamber.

The air supply unit 20 includes a plurality of air nozzles A1 to A4 and B1 to B4 (see FIG. 6) for supplying combustion air to various positions of the secondary combustion chamber 4. In this case, the plurality of air nozzles are preferably installed at a specific height of the second combustion chamber 4 in which adjustment of the amount of combustion air can be well reflected in the temperature change of each position of the thermocouples T.

4 is a block diagram illustrating a temperature control apparatus of a secondary combustion chamber of an incinerator according to an embodiment of the present invention.

Referring to FIG. 4, the control device of the present embodiment uniformly adjusts the temperature of the secondary combustion chamber 4 based on the plurality of thermocouples T and the temperature information measured from the thermocouples T described above. It includes a temperature control means. The temperature regulating means includes an air supply unit 20 and a control unit 30, and the control unit 30 includes a calculating unit 32 and an air amount control unit 34.

Thermocouples T measure the temperature of the various locations of a particular cross section in secondary combustion chamber 4. The measured temperature is provided to the calculator 32. For this purpose, a system (not shown) for converting and measuring the temperature measured at each of the thermocouples T into an electrical signal may be used. In addition, the calculation unit 32 is a software system for calculating the average temperature and the temperature deviation and / or standard deviation for each position in the secondary combustion chamber 4 with respect to the average temperature using the provided temperature data to be used. Can be. In addition, the air amount control unit 34 uses the result calculated by the calculating unit 32 to calculate the amount of combustion air at a position having the largest deviation from the average temperature, more preferably, the position having the maximum standard deviation of the temperature. To control the air supply unit 20 is controlled.

In the embodiment of the present invention, the standard deviation is used to find the position where the deviation from the average temperature is the largest. When the standard deviation is used, the deviation value of the temperature used for the control can be unified to a positive value. have. And, among the various positions where the temperature is measured by the thermocouples (T), the position where the standard deviation is the largest, that is, the position where the maximum standard deviation is the first, is the target position requiring temperature control. Once the temperature at the target location is adjusted close to the average temperature by adjusting the supply of combustion air, the standard deviation of the temperature at the other location is the largest, so that if the above temperature control is repeated over and over again, the temperature in the secondary combustion chamber is It becomes substantially uniform. At this time, it is preferable that the temperature evaluation is performed in parallel with the change in the supply amount of the combustion air.

On the other hand, in the target position where the temperature deviation (or standard deviation) is the largest, the temperature at the position is higher than the average temperature, and the temperature at the position is lower than the average temperature, respectively. In the following [Table 1] and [Table 2], when the temperature deviation is the largest position, that is, the target position which is the maximum standard deviation, the temperature of the position is lower than the average temperature ([Table 1] The method of controlling the temperature of the secondary combustion chamber by adjusting the air volume will be explained by dividing into the case of high) (see [Table 2]).

<When the temperature at the position of the maximum standard deviation is lower than the average temperature>

<When the temperature at the position of the maximum standard deviation is higher than the average temperature>

6 shows the thermocouple placement position and the air nozzle placement position in the secondary combustion chamber of the incinerator.

Referring to FIG. 6, nine thermocouples T11 to T33 (collectively T) are arranged in the secondary combustion chamber in an array of rows, and four air nozzles A1 to A4 and B1 to each of the left and right sides of the secondary combustion chamber. B4) is arranged. Accordingly, the thermocouples in the left column and the right column are relatively close to the left and right air nozzles, while the thermocouples T12, T22, and T32 in the center row are relatively far from the left and right air nozzles. For example, the thermocouple T11 is disposed in the leftmost column (column 1) and the top row (column 1) of the matrix array, and the measured temperature at the position is the air nozzle A1 and the air nozzle A2. It is most affected by the air supply adjustment, and the measured temperature of the thermocouple T21 in the leftmost column (1 row) and the center row (2 rows) is controlled by the air supply amounts of the air nozzles A2 and A3. Most affected.

More specifically, the relationship between the temperature and the air volume control at each position is as follows.

(1) air volume control with A1 and A2 if temperature adjustment of T11 is required;

(2) control of air volume with A2 and A3 if temperature adjustment of T21 is required;

(3) air volume control with A3 and A4 if T31 temperature adjustment is required;

(4) control air volume with B1 and B2 if temperature adjustment of T13 is required;

(5) control air volume with B2 and B3 if temperature adjustment of T23 is required;

(6) When temperature adjustment of T33 is necessary, air volume is controlled by A3 and A4.

However, if it is necessary to adjust the temperature of T12, T22, T32 installed in the center row (i.e. 2 rows),

(7) If temperature adjustment of T12 is necessary, compare the standard deviation of T11 and T13.

If the temperature standard deviation of T11 is greater than the temperature standard deviation of T13, control the air volume with A1 and A2,

If the temperature standard deviation of T13 is greater than the temperature standard deviation of T11, control the air volume with B1 and B2;

(8) When temperature adjustment of T22 is necessary, compare the standard deviation of temperature of T21 and T23,

If the temperature standard deviation of T21 is greater than the temperature standard deviation of T23, control the air volume with A2 and A3,

If the temperature standard deviation of T23 is greater than the temperature standard deviation of T21, control the air volume with B2 and B3;

(9) When temperature adjustment of T32 is necessary, compare the temperature standard deviation of T31 and T33,

If the temperature standard deviation of T31 is greater than the temperature standard deviation of T33, control the air volume with A3 and A4;

If the temperature standard deviation of T33 is greater than the temperature standard deviation of T31, control the air volume with B3 and B4.

7 is a graph showing temperatures measured from the nine thermocouples described above and average temperatures obtained from the measured temperatures. The temperature standard deviation at each position can be obtained from the average temperature and the respective temperature difference of the graph shown in FIG. 7. The temperature standard deviation is greatest at the position where the deviation from the average temperature is greatest, and the temperature standard deviation at the T33 position is largest in FIG. 7.

8 shows that when the temperature measured in the thermocouple T33 is the lowest, that is, when the maximum standard deviation is the largest and the temperature is lower than the average temperature, the thermocouple T33 is controlled by adjusting the air supply amounts of the air nozzles B3 and B4. Demonstrate how to increase the temperature of the location.

As shown in FIG. 8, when the calculation result of the calculation unit 32 shown in FIG. 4 determines that the temperature at the position T33 is the lowest and the temperature standard deviation (or the temperature deviation) is also the greatest (S1), the air nozzle B3 And increase the air supply amount to the air nozzle (B4) (S2). Thereafter, it is determined whether there is an increase in temperature (S3). If there is an increase in temperature, the air supply is increased (S4-1). If there is no increase or decrease in temperature, the air supply is decreased (S4-2). When the temperature is within the allowable range (S5-1 or S5-2) by the increase or decrease of the air supply amount by the above steps S4-1 or S4-2, the increase or decrease of the air supply amount is stopped.

9 shows that when the temperature measured in the thermocouple T22 is the lowest, that is, the maximum standard deviation is the largest and the temperature is lower than the average temperature, the temperature of the thermocouple T22 is increased by adjusting the air supply amount of the air nozzle. The control method is shown.

The control method shown in FIG. 9 proceeds substantially similarly to the method shown in FIG. 8, but in this case, the air nozzle is advantageous for temperature control among the left and right nozzles because the amount of air at the center position far from the left and right air nozzles is controlled. Steps for selecting are added. In step S11 of FIG. 9, Abs (T21-Tm) represents the absolute value of the difference between the measured temperature and the average temperature of T21 (Abs stands for absolute and represents an absolute value), and Abs (T23-Tm) represents T23. The absolute value of the difference between the measured temperature and the average temperature is shown. In step S11, in the case of Abs (T21-Tm)> Abs (T23-Tm), the temperature of the T22 position is controlled in the same direction as the average temperature by using the air nozzles A2 and A3 adjacent to T21 (S12). -1) Otherwise, using the air nozzles B2 and B3 adjacent to T23, the temperature at the T22 position is controlled in the same direction as the average temperature (S12-2). The subsequent method controls the temperature of the T22 position in the same order as in FIG.

Finding the position where the standard deviation of temperature is greatest from a plurality of thermocouples installed in a specific section of the secondary combustion chamber, and repeating the process of adjusting the temperature of the position close to the average temperature, that is, within the allowable temperature range, The temperature may be uniform.

1 is a view showing an example of a conventional incinerator structure.

2 shows the arrangement of thermocouples installed in a secondary combustion chamber of an incinerator according to one embodiment of the invention.

FIG. 3 is a view showing air supply units used for adjusting the amount of air for combustion of the primary combustion chamber and the secondary combustion chamber together with the thermocouples shown in FIG. 2;

4 is a view for explaining a temperature control device of the secondary combustion chamber in the incinerator according to an embodiment of the present invention.

5 is a graph for explaining the temperature distribution in the secondary combustion chamber according to the lack or excessive air in the secondary combustion chamber.

6 is a view showing the arrangement of the air nozzle of the thermocouples and the air supply according to an embodiment of the present invention.

7 is a graph showing the difference between the temperature and the average temperature at each location with thermocouples.

8 is a flow chart showing an example of a method of controlling the temperature of the T33 position among the positions of several thermocouples.

9 is a flowchart showing a method of controlling the temperature of the T22 position among the positions of several thermocouples as an example.

Claims (16)

delete delete delete In the temperature control method of the secondary combustion chamber in the incinerator, (a) measuring temperature at various locations in a particular section of the secondary combustion chamber; (b) based on the measured temperature, finding a target position having the largest temperature deviation from the average temperature among the various positions; And (c) adjusting the temperature of the target location to be close to the average temperature, The step (c) is made by adjusting the amount of combustion air at the target position or a position adjacent thereto, When the temperature of the target position found in the step (b) is lower than the average temperature, the step (c) increases the supply amount of combustion air to the target position or a position adjacent thereto, and the combustion air Evaluate whether the temperature of the target location increases with increasing supply amount of, and if the temperature of the target location increases, the supply amount of the combustion air continues to increase until the temperature of the target location approaches the average temperature. Temperature control method of the combustion chamber, characterized in that. In the temperature control method of the secondary combustion chamber in the incinerator, (a) measuring temperature at various locations in a particular section of the secondary combustion chamber; (b) based on the measured temperature, finding a target position having the largest temperature deviation from the average temperature among the various positions; And (c) adjusting the temperature of the target location to be close to the average temperature, The step (c) is made by adjusting the amount of combustion air at the target position or a position adjacent thereto, When the temperature of the target position found in the step (b) is higher than the average temperature, the step (c) reduces the supply amount of combustion air to the target position or a position adjacent thereto, and the combustion air Evaluate whether the temperature of the target location decreases as the supply amount of the gas decreases, and if the temperature of the target location decreases, the supply amount of the combustion air continues to decrease until the temperature of the target location approaches the average temperature. Temperature control method of the combustion chamber, characterized in that. The temperature control method of the combustion chamber according to claim 4 or 5, wherein when the temperature standard deviation of the target position is within a predetermined allowable range, the temperature of the target position is determined to be close to the average temperature. The temperature control method of the combustion chamber according to claim 6, wherein the rate of adjustment of the supply amount of the combustion air is changed in accordance with the decrease in the temperature standard deviation. The method of claim 4 or 5, wherein the step (b), in order to find the position with the largest temperature deviation, by calculating the standard deviation of the various positions, characterized in that the position with the largest standard deviation is determined as the target position The temperature control method of the combustion chamber made into. The method according to claim 4 or 5, wherein the step (c) is performed by adjusting the air volume using at least one air nozzle close to the target position among the air nozzles on the left and right sides of the secondary combustion chamber, When the position is relatively far from the left and right air nozzles in the middle of the secondary combustion chamber, the air position close to the target position by using air nozzles close to the position where the temperature deviation is severe among the left and right adjacent temperature measurement positions. Temperature control method of the combustion chamber, characterized in that for adjusting the amount of air. The method according to claim 4 or 5, The step (a) is to measure the temperature of the various locations from the thermocouples arranged in three rows and three columns in a specific cross section of the secondary combustion chamber, In step (b), the position of the thermocouple having the largest deviation from the measured temperature is determined as the target position. The step (c) of the combustion chamber temperature control characterized in that for controlling the air supply amount for the combustion to the target position using at least one air nozzle selected from the two sets of air nozzles installed on the left and right sides of the secondary combustion chamber. Way. The method according to claim 10, wherein when the position of one of the thermocouples in the second column of the thermocouples arranged in three rows and three columns is determined as the target position, the deviation of the average temperature of the thermocouple positions in the first column and the third column, Selecting a left or right air nozzle adjacent a larger thermocouple, and using the selected air nozzles to adjust the amount of combustion air supplied to the target location. The method according to claim 4 or 5, wherein the step (a), the temperature control method of the combustion chamber, characterized in that for measuring the temperature using a plurality of thermocouples arranged in a row in a specific cross section of the secondary combustion chamber. In the temperature control device of the secondary combustion chamber in the incinerator, A plurality of thermocouples for measuring temperature at various locations in a particular section of the secondary combustion chamber; And Based on the measured temperature, a temperature adjusting means for finding a target position having the largest temperature deviation from the average temperature among the various positions and adjusting the temperature of the target position close to the average temperature, The temperature control means, An air supply unit having a plurality of air nozzles installed in the secondary combustion chamber to supply combustion air to the various positions; An operation unit for calculating an average temperature of the specific section and a standard deviation of each of the various positions based on the measured temperature; And an air amount control unit for controlling the air supply unit so as to adjust a supply amount of combustion air for a specific position having the largest standard deviation. The apparatus of claim 13, wherein the plurality of thermocouples are arranged in rows in a specific cross section of the secondary combustion chamber. The apparatus of claim 14, wherein the plurality of thermocouples are arranged in three rows and three columns in a specific cross section of the secondary combustion chamber. delete

Images