KR101885759B1 - Ash adhesion and corrosion mitigation method reduce boiler tube - Google Patents

Abstract

A method for reducing ash adhesion and corrosion of a boiler tube,
A method for reducing ash adhesion and corrosion of a boiler tube according to the present invention includes a thickness detection detector installed outside a boiler tube to detect a thickness of the boiler tube in real time; A chute blower for injecting high-pressure air into a boiler tube to remove accumulated ash from the boiler tube; The control unit controls the air injection pressure of the chute blower according to the ash accumulation state according to the thickness change of the boiler tube sensed by the thickness detection detecting unit. This method reduces boiler tube corrosion, Detection detection step; Calculating a fuel ash content and minerals; Determining whether excessive generation of ash is expected if the occurrence of excessive ash is judged; and if it is not expected to generate extreme ash, real-time monitoring through thickness measurement is performed, And determining the occurrence of the problem
It is possible to prevent the ash from being accumulated on the outer surface of the boiler tube, and the corrosion of the boiler tube can be reduced.

Description

{Ash adhesion and corrosion mitigation method reduce boiler tube}

More particularly, the present invention relates to a reduction method for reducing the corrosion of a boiler tube due to slagging and fouling in which ash generated during combustion accumulates in a boiler tube .

Generally, slagging which is generated by burning fuel in a boiler and volatile component contained in ash are condensed and adhered to boiler tube together with fly ash, resulting in fouling, The more fuel is generated, the more it occurs.

In recent years, international CO ₂ The use of renewable fuels is steadily increasing due to the reduction and regulation of the Renewable Portfolio Standard (RPS).

At present, only wood pellets and sewage sludge are burned together with coal in renewable fuels.

In addition, studies are underway to use waste heat sources incinerated from the aspect of recycling of waste as power generation heat sources. However, biomass and wastes have more sulfur (S) and chlorine (Cl) Thereby causing corrosion of the combustion system equipment.

The following Patent Document 1 discloses a method for preventing corrosion of the outer surface of a heat exchanger or a boiler.

The heat exchanger of the patent document 1 or the outer surface corrosion prevention method of the boiler neutralizes the corrosion product by using the liquid additive composition containing magnesium ions and the base material exposed to the surface inhibits the corrosion by the corrosion inhibitor, So that the integrity of the outer surface exposed to the exhaust gas can be secured.

The following Patent Document 2 discloses a boiler tube leakage and dust accumulation diagnosis apparatus.

The boiler tube leakage and dust accumulation diagnosis apparatus of Patent Document 2 is installed in the lower part of at least one tube block group formed by a plurality of tubes grouped in the boiler, At least one sensing part formed in a space and being lifted or lowered according to the weight of the water or the accumulated dust contained in the internal space; One or more supports on which the sensing unit is seated and secured to the inner wall of the boiler; A magnetic sensor installed adjacent to each of the sensing units on the outer wall of the boiler and sensing the rising and lowering of the sensing unit installed in the boiler using magnetic force; And a control unit for measuring the leakage of the tube provided in the boiler and the amount of dust accumulation in the boiler according to the ascending and descending information of the sensing unit measured by the magnetic sensor.

On the other hand, when ash accumulates on the outer surfaces of various tube-shaped components such as heat exchangers, cooling tubes, reheaters, condensers, etc. inside the boiler during the combustion process of the boiler, not only does it cause corrosion of the boiler tubes, do.

A technique of spraying high-pressure air through a chute blower to the boiler tube to reduce accumulation of ash on the outer surface of the boiler tube is applied.

Korean Patent Publication No. 10-2013-0035643 (published on Apr. 09, 2013) Korean Patent Publication No. 10-2014-0076100 (published on Aug. 20, 2014)

The boiler tube corrosion reduction method through the chute blower according to the related art injects air of constant pressure into the chute blower regardless of the characteristics of the fuel or other combustion conditions so that the ash accumulated on the outer surface of the boiler tube can be effectively So that the ash accumulates on the outer surface of the boiler tube, thereby deteriorating the performance of the boiler tube and shortening the service life.

It is an object of the present invention to provide a boiler tube which can reliably remove the ash accumulated on the outer surface of the boiler tube, thereby reducing the performance degradation and corrosion of the boiler tube, And a method of reducing corrosion.

According to an aspect of the present invention, there is provided a method for reducing ash adhesion and corrosion of a boiler tube, the method including: a fuel property detector; Ash content and mineral content calculator; An estimated excessive position of ash generation; A thickness sensing detector for sensing the thickness of the boiler tube in real time; A chute blower for blowing air into the boiler tube to remove accumulated ash from the boiler tube; A control unit for controlling an air injection pressure of a chute blower in accordance with a result of determination of an excessive ash occurrence position and a ash accumulation state according to a thickness change of a boiler tube sensed by a thickness detection detector, Detecting the characteristics of the fuel before the injection of the boiler fuel; Calculating a fuel ash content and a mineral content; Determining whether the occurrence of the minute is excessive; Determining whether an ash over-generation occurrence position is determined if the occurrence of an excessive ash is judged; And spraying the boiler tube with air having a higher pressure than the reference pressure through the chute blower at a position where the ash excess occurrence expected position or the thickness detection result is equal to or greater than the reference thickness.

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention is characterized by determining a change in fuel input amount or mixed amount when the thickness detection result is not greater than the reference thickness and is not excessive.

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention is characterized in that when it is determined that the ash is excessive, a step of controlling the pressure and controlling the injection position according to the expected amount of ash of the tube is added.

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention is characterized in that the step of calculating the content of the fuel ash and the amount of mineral as long as it is changed in the step of determining the change of the fuel input amount or the mixing amount.

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention moves to a step of determining whether or not the ash accumulation is performed through the thickness detection if the change in the fuel input amount or the mixing amount is not changed do.

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The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention includes the steps of injecting air having a higher pressure than a reference pressure into the boiler tube through the chute blower, .

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention is characterized in that the step of calculating the content of the fuel ash and the amount of minerals is carried out by using the base component to acid component ratio (B / A value) Quot; is calculated on the basis of an index.

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention is characterized in that the step of calculating the content of the fuel ash and the amount of minerals is carried out in accordance with the base component to the acid component ratio (B / A value) and the chlorine (Cl) A fouling index, and a fouling index according to sodium (Na) content.

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention comprises the steps of calculating the content of the fuel ash and the amount of minerals, and determining the melting point temperature, the base component to the ash component ratio (B / A value) The fouling index according to the content of chlorine (Cl), and the fouling index according to the content of sodium (Na).

According to the method of reducing ash adhesion and corrosion of a boiler tube according to the present invention, it is possible to determine the possibility of causing slagging and fouling by calculating the amount of fuel and the amount of minerals by detecting the property of the fuel before the boiler is injected, It is possible to effectively remove the ash accumulated on the outer surface of the boiler tube by controlling the air pressure of the chute blower based on the estimated ash generation position based on the calculated ash, mineral amount and fuel injection position.

According to the method of reducing ash adhesion and corrosion of a boiler tube according to the present invention, the thickness of slagging and fouling accumulated in a boiler tube is detected in real time and the air pressure of the chute blower is controlled according to the detection result The ash accumulated on the outer surface of the boiler tube can be effectively removed.

According to the method of reducing ash adhesion and corrosion of a boiler tube according to the present invention, it is possible to anticipate and predict the ash generation amount from the amount of fuel and the amount of minerals, and to detect the thickness of the boiler tube, Two criteria are proposed that can effectively remove ash accumulated on the outer surface of the boiler tube by injecting high-pressure air at a position above the reference thickness, even if the thickness is over.

According to the method of reducing ash adhesion and corrosion of a boiler tube according to the present invention, it is possible to quickly and preliminarily cope with the accumulation of ash on the outer surface of the boiler tube, thereby preventing the performance of the boiler tube from deteriorating, The life span can be extended.

According to the ash reduction and corrosion reduction method of the boiler tube according to the present invention, the performance of the boiler tube can be stably maintained, thereby preventing the boiler efficiency from lowering.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a batch sticking reduction and corrosion abatement device of a boiler tube according to the present invention;
FIG. 2 is a block diagram of a control section of a method for reducing ash adhesion and corrosion of a boiler tube according to the present invention. FIG.
3 is a control flow chart of a method of reducing ash adhesion and corrosion of a boiler tube according to the present invention.

Ash is a solid or liquid particulate that floats in the furnace and refers to a material that flows like a gas in small particulate form. These ash consists of charcoal (ash), ash (or ash), and mineral matter produced after combustion. The ash deposits are collectively referred to as the ash deposits which are adhered to the inner walls, water pipes and boilers by the contained mineral components, heat flux and temperature.

There are two main types of ash ash: molten ash and alkali salts ash. Molten ash, or melt ash, occurs primarily around the burner region, which is a high temperature region above 1000 ° C where combustion occurs in the furnace.

When the rye ash is classified by temperature, wall slag generated on the wall surface of the high temperature region in the furnace, high-temperature ash that naturally flows down to the wall according to the boiler capacity and cycle, Superheater slag, melting ash produced by convection near the superheater.

The classification of slag is divided into four types as Metallic, Amorphous, Vesicular and Sintered. Alkali salts ash occurs in the region behind the boiler which is a low temperature region below 800 ℃. The ash that mainly affects the corrosion of the boiler tube is the ash of the alkaline salt component, which combines with the exhaust gas and the alkaline ash to form sulfur oxides, which again produce alkaline sulphates and corrode the boiler tubes.

The slagging and fouling phenomena are mainly caused by internal temperature, particle size, heat transfer, and heat flux. The order of progression depends on particle formation, sintering lamination, and heat transfer stacking. The slag is generated in the burner portion of the furnace and under the downfire, and is deposited on the furnace wall to lower the insulation effect and efficiency, and adversely affect the heat transfer of the wall. Also, wall slag is generated around the burner, which is called "eyebrows", which interferes with the flow of coal and air. This eyebrows phenomenon reduces the efficiency of the burner and shortens the life of the burner.

The degree of slagging and fouling which causes the corrosion of the boiler tube from the nature of the fuel can be predicted before the fuel is introduced into the boiler, and it is calculated whether it causes slagging or fouling, It is possible to judge (predict) the estimated position of excessive ash generation.

In the present invention, a method for detecting the occurrence of the slagging and fouling phenomenon, that is, whether or not the ash overflow occurs, by detecting the properties of the fuel is as follows.

First, Ash Fusion Temperature is the most suitable method for evaluating the influence / tendency of slagging in furnace coal ash. The main minerals that generate slagging are iron, calcium, and sodium. It is directly affected by high iron content and carbon monoxide (CO) levels during burning, which are the main generated minerals of slagging. It is sticky when it is rich and low in nitrogen (NOx) It tends to become a stickier form.

The method of calculating the melting point generation temperature

Melting point temperature

IDT = Initial Deformation Temperature (IDT) at which the corners or angular quadrangular corners start to be melted by temperature,

ST = the temperature at which the round shape is formed, the temperature at which the cone height and cone width are equal (Softening or sphere Temperature, ST)

HT = hemisphere temperature (HT),

Evaluation index of slagability according to melting point temperature Slagging property Rating scale  Low Medium High Severe Comparison value > 1343 ° C 1232-1343 DEG C 1149-1232 ° C 1149 DEG C

The melting point temperature generated during combustion in the boiler is closely related to the occurrence of slagging. As shown in Table 1, if the temperature is high, the possibility of occurrence of slagging is low, and if the temperature is low, the possibility of occurrence of slagging is high. It can be predicted that when the slagging property of the ash is high (in the case of Severe, the comparison value is less than 1149 ° C), the ash adheres to the boiler tube during boiler burning, thereby reducing the efficiency of the boiler during boiler heat exchange. On the contrary, when the slagging property is low (1343 ° C or more), it is considered that the ash produced during combustion is less likely to adhere to the boiler tube, and thus the efficiency of the boiler is reduced.

Therefore, when the slagging property is high, in order to prevent floating ash that flows together with the exhaust gas from being seated on the tube and melting to adhere to the boiler tube, the discharge pressure of the chute blower is increased, It is possible to prevent the ash from sticking to the tube in advance by blowing the ash beforehand into the stuf blower and sending it to the bag filter at the rear end before adhesion. When the slagging property is low, the pressure of the chute blower is controlled to be discharged at a low pressure.

Second, there is a method of using the base component to acid component ratio (B / A value) of ash.

Ash of a basic mineral is a _{SiO 2, Al 2 O 3,} TiO 2 , and the mineral acid ash has a _{Fe 2 O 3, CaO, MgO} , K 2 O, Na 2 O.

The ratio of base component to acid component (B / A value)

Slagging index using mineral element analysis, which is the base component of ash to acid component ratio Slagging property Rating scale  Low Medium High Severe B / A value 0.5 or less 0.5 to 1.0 1.00 or higher 1.75 or higher

 If the B / A value is more than 1.75 (in the case of Severe), the ash is adhered to the boiler tube and the efficiency of the boiler can be reduced during boiler heat exchange by calculating the base component to acid component ratio of the ash If the B / A value is less than 0.5 (Low), the ash generated during combustion is less likely to adhere to the boiler tube, and thus it is judged that the factor that reduces the efficiency of the boiler during the boiler heat exchange is small.

Accordingly, in the case where the slagging property is high, in order to prevent floating ash flowing together with the exhaust gas from being deposited on the tube and melting to adhere to the boiler tube, the discharge pressure of the chute blower is increased, The ash can be prevented from sticking to the tube beforehand by blowing the ash beforehand to the blower and sending it to the bag filter at the rear end before adhesion. When the slagging property is low, the pressure of the blower is discharged at a low pressure.

Fouling is a phenomenon in which volatile components contained in fly ash, ie, NaSO ₄ , NA ₂ O and CaSO ₄ , volatilize during combustion and condense on the convection heat front surface together with fly ash in the combustion gas, This phenomenon is called fouling, which reduces convection heat transfer and interferes with the flow of combustion gas. The higher the sintering strength of the fly ash, the higher the fouling property and the higher the sintering strength, the higher the content of alkali salt (Na ₂ O + K ₂ O) and the ratio of base component to acid component (B / A value). In addition, chlorine (Cl) content (W% in dry) and sodium (Na) content (W% in dry) affect fouling. Fouling index, chlorine content (W% in dry), and sodium content (W% in dry) are used as an index for predicting this phenomenon.

Fouling index (F _u ) using mineral analysis

Foulling index using mineral analysis Foulability Rating scale  Low High Extremely high Comparison value F _u = 0.6 F _u = 0.6 to 40 F _u = 40

Fouling index according to chlorine (Cl) content Foulability Rating scale  Low Medium High Comparison value 0.1 or less Around 0.3 0.5 or more

Fouling index according to sodium content Foulability Rating scale  Low Medium High Comparison value 0.07 or less Around 0.2 0.33 or more

If the fouling comparison value is more than 40 (Extremely high) or the chlorine (Cl) content is more than 0.5 (High) or the sodium content (Na) is more than 0.33 (High) It is predicted that the efficiency of the boiler can be reduced by preventing the convection heat transfer during the boiler heat exchange by increasing the generation and attaching the point condenser to the boiler tube.

Therefore, in order to prevent the floating ash that flows together with the exhaust gas from being seated on the tube when the fouling performance is high, the discharge pressure of the chute blower is increased so that the ash is blown in advance with the blower If it is sent to the bag filter at the rear end, it is possible to prevent the ash from condensing in the tube in advance.

The fouling index according to the slagging property determination criterion, the base component to the acid component ratio (B / A value) of the ash, the fouling index using the mineral analysis, And the fouling index according to the sodium content are used in the calculation of the ash content and the mineral content to determine the ash excess resulting from the fuel combustion of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for reducing ash adhesion and corrosion of a boiler tube according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of an apparatus for reducing ash adhesion and corrosion of a boiler tube according to the present invention. FIG. 2 is a view showing the configuration of a control unit of a method for reducing ash adhesion and corrosion of a boiler tube according to the present invention. FIG. 2 is a control flow chart of the ash adhesion reduction and corrosion reduction method of a boiler tube according to the present invention.

The apparatus for reducing ash adhesion and corrosion of a boiler tube according to the present invention comprises a fuel property detecting unit for detecting a property of a fuel before entering a boiler, a calculating unit for calculating the content of ash in the fuel and the amount of ash generation, A thickness overheat detection unit 20 installed outside the boiler tube 10 for sensing the thickness of the boiler tube 10 in real time; A chute blower (30) for blowing high pressure air to the boiler tube (10) to remove accumulated ash from the boiler tube (10); And a control unit 40 for controlling the air injection pressure of the chute blower 30 according to the ash accumulation state according to the thickness change of the boiler tube sensed by the thickness detection detecting unit 20. [

The method for reducing ash adhesion and corrosion of a boiler tube according to the present invention is a method for reducing corrosion of a boiler tube by controlling the ash reduction and corrosion reduction device of a boiler tube, If it is judged that the ash generation is excessive, it is judged where the ash overflow is expected, and high pressure air is injected to the expected position of the ash overflow occurrence by the high pressure chute blower do.

A thickness detection unit 20 installed outside the boiler tube 10 to sense the thickness of the boiler tube 10 in real time if the occurrence of the excessive ash is not determined; A chute blower (30) for blowing high pressure air to the boiler tube (10) to remove accumulated ash from the boiler tube (10); A control unit 40 for controlling the air injection pressure of the chute blower 30 according to the ash accumulation state according to the thickness variation of the boiler tube sensed by the thickness detection detecting unit 20, Thereby reducing the corrosion of the boiler tube 10 by removing the accumulated ash.

In the method of reducing ash adhesion and corrosion of a boiler tube according to the present invention, an ultrasonic sensor or a laser sensor may be used as the boiler tube thickness detection detector.

The ash cohesion reduction and corrosion reduction method of a boiler tube according to the present invention includes a fuel property detection step.

Currently, various types of coal are used in coal-fired power plants, and various kinds of coal are stored in coal-fired power plants.

In addition, various types of raw materials are injected into the incinerator of the coal-fired power plant, and the characteristics of the input raw materials must be determined in advance in order to solve the problem of the combustion failure which may occur later.

The ash cohesion reduction and corrosion reduction method of a boiler tube according to the present invention includes the steps of containing a fuel ash and calculating a mineral and judging whether or not ash generation is excessive.

In order to determine whether or not the ash overflow has occurred, the fouling temperature, the base component to acid component ratio (B / A value) of the ash, the fouling index using the mineral analysis, The fouling index according to the content of chlorine (Cl) and the fouling index according to the content of sodium (Na) are respectively calculated and the calculated value is compared with the reference value to derive the judgment value, . And then estimating the expected amount of ash generation based on the amount of fuel supplied thereafter.

(Ash, volatile matter, fixed carbon, moisture content), mineral content (NaO2, K20, etc.) of the selected fuels, and The amount of fuel input, and the expected combustion temperature.

At this time, the total oxidation condition is assumed.

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention includes a step of determining an expected position of ash occurrence when it is determined that the ash overflow occurs in the step of determining whether or not the ash production is excessive.

At this time, the position of the soot blower installed in the boiler, incineration burning furnace, etc. is estimated, and the position of the heat exchanger, the cooling tube, the reheater, the condenser, and the like are ascertained.

If extreme ash production is not expected, proceed to boiler tube thickness detection.

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention includes a step of determining an occurrence of abnormality by real-time monitoring through thickness measurement if extreme ash production is not expected in a severe ash generation step.

The thickness of the ash deposited on the surface of the tube is measured through a thickness measurement detector such as a level gauge. When the condition of the ash in the flue gas accumulated in the continuous flue gas is exceeded, The following shall apply.

It is possible to determine the occurrence of abnormality by measuring the thickness through the thickness measurement. If the abnormality as mentioned above is expected to occur, it is possible to determine the occurrence of extreme ash due to a large increase in ash due to changes in the constitution of minerals contained in ash, .

In addition, the location of the soot blower installed in the boiler, incineration burning furnace, etc. is estimated, and the position of the heat exchanger, the cooling tube, the reheater, the condenser, etc. is grasped and the shoot blower is operated at a pressure higher than the present .

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention includes a step of judging the occurrence of an abnormality by real-time monitoring through thickness measurement, and a step of judging a change in an input amount and a mixed amount when abnormality does not occur.

At this time, when the amount of fuel to be injected and the amount of fuel to be mixed are changed, it is reduced to a closed loop in which the amount of the corrosion-inducible substance is changed to calculate the initial fuel mixture amount.

In addition, if there is no change in fuel amount and mixing amount, the boiler real-time measurement system continues the detection.

The ash reduction and corrosion reduction method of the boiler tube according to the present invention can prevent the occurrence of extreme ash formation in the extreme ash generation presumption determination step or cause an abnormality in the step of determining the occurrence of abnormality through real time monitoring through thickness measurement And determining a severe ash accumulation expected site occurrence point when the ash accumulation expected site occurrence point is determined.

At this time, the position of the heat exchanger, the cooling tube, the reheater, the condenser, and the like may be grasped and compared with the portion where the thickness detection portion is mounted.

In addition, the method of reducing ash adhesion and corrosion of a boiler tube according to the present invention includes the step of injecting air of a higher pressure through the chute blower when a severe ash accumulation site is detected.

That is, when the batch accumulation progress position is detected, the pressure of the chute blower installed in the heat exchanger, the cooling tube, the reheater, the condenser, etc. is raised and the strong air is sprayed to the necessary portion.

The method of reducing ash adhesion and corrosion of a boiler tube according to the present invention includes the steps of detecting an abnormality through thickness measurement again after an air injection step of a higher-level chute blower, and judging an ash accumulation position hydraulic pressure fluctuation and an actuator position control .

If there is no abnormality in the abnormality detection step through the thickness measurement, it is restored to the real time monitoring detection function after the input amount control, and if there is abnormality, the batch addition position oil pressure fluctuation and the actuator position control are judged.

If the abnormality is not detected in the step of judging the ash accumulation position hydraulic pressure fluctuation and the actuator position control, the high-pressure chute blower injects one step higher air.

In addition, control is performed so that the input amount is injected twice higher than the presently set amount, and this method is repeatedly performed by repeating the closed loop to detect anomaly.

In addition, the hydraulic actuator blower is used to inject the air to the optimum position in the stacked portion.

In addition, when the progress of corrosion is suppressed, the input amount is cut off.

The ash cohesion reduction and corrosion reduction method of a boiler tube according to the present invention includes a step of initializing if the fuel property is changed.

As described above, the method of reducing ash adhesion and corrosion of a boiler tube according to the present invention detects the thickness of the boiler tube in real time and controls the injection pressure of the chute blower that blows air to the boiler tube according to the sensed value, Reduces corrosion on boiler tubes by reducing ash accumulated on the surface.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

10: Boiler tube
30: Suit blower
40: control unit
41: fuel property detector
42: Calculation part - Ash content and mineral content
43: Excessive ash occurrence estimated position determining unit
44: Tube thickness detector
45: Chute blower control - Control of injection pressure and injection position

Claims (9)

A method for reducing ash adhesion and corrosion of a boiler tube includes a fuel property detector; Ash content and mineral content calculator; An estimated excessive position of ash generation; A thickness sensing detector for sensing the thickness of the boiler tube in real time; A chute blower for blowing air into the boiler tube to remove accumulated ash from the boiler tube; A control unit for controlling an air injection pressure of a chute blower in accordance with a result of determination of an excessive ash occurrence position and a ash accumulation state according to a thickness change of a boiler tube sensed by a thickness detection detector, ,
Detecting characteristics of the fuel before the boiler fuel injection;
Calculating a fuel ash content and a mineral content;
Determining whether the occurrence of ash is excessive;
Determining an expected position of excessive ash generation if it is determined that the occurrence of ash generation is excessive,
Determining whether or not the batch is stacked by detecting thickness if it is not determined to be excessive;
Spraying the boiler tube with air at a higher pressure than the reference pressure through the chute blower at a position at or above the reference thickness, Reduced and Corrosive Reduction Methods. The method according to claim 1,
If it is determined that the batch is not excessive and is less than or equal to the reference thickness,
And determining a change in the fuel input amount or the mixed amount. The method according to claim 1,
If it is determined that the ash is excessive,
Wherein the step of controlling the pressure and controlling the injection position is added in accordance with the predicted amount of ash of the tube. 3. The method of claim 2,
If the change in the fuel input amount or the mixture amount is changed,
Calculating the content of the fuel ash and the amount of minerals;
If it is determined that the change of the fuel input amount or the mixture amount is not changed,
And determining whether or not the ash accumulation through the thickness detection is determined. delete The method according to claim 1,
Spraying the boiler tube with air at a higher pressure than the reference pressure through the chute blower,
And determining whether or not the ash accumulation through the thickness detection is determined. The method according to claim 1,
Calculating the content of the fuel ash and the amount of minerals;
Wherein the ash content is calculated on the basis of the base component of the ash to the acid component ratio (B / A value) or the fouling index using the mineral analysis. The method according to claim 1,
Calculating the content of the fuel ash and the amount of minerals;
And a fouling index according to the content of sodium (Na), based on the base component to acid component ratio (B / A value) and the chlorine (Cl) content of the ash, Ash adhesion reduction and corrosion reduction method. The method according to claim 1,
Calculating the content of the fuel ash and the amount of minerals;
The fouling index according to the foul point temperature, the base component of ash to acid component ratio (B / A value), the fouling index using minerals analysis, the fouling index according to chlorine content, and the sodium content Wherein the ash content is calculated by including at least one of the ash content and the ash content.

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