JP2001208322A - Method for judging property of molten material, method for operating surface melting furnace, and control device - Google Patents

Abstract

(57) [Summary] [Problem] To be thrown into a surface melting furnace 1 for melting incombustible material as a processing object thrown into a main chamber 2 by heat generated by burning a combustible material in a main chamber 2. The properties of the flammability of the object to be processed are determined, and even when the flammable material is charged together with the non-combustible material as the object to be processed, the combustion of the combustible material and the melting of the non-combustible material in the main chamber 2 are stably performed. Provide a means to maintain. SOLUTION: A surface temperature of an input portion of an object to be processed introduced into a main chamber 2 is detected, and a combustible substance and an incombustible substance are identified based on a fluctuation state of the detected temperature within a predetermined time. . When the detected temperature falls below the predetermined temperature range, it is more preferable to determine that the combustible is contained in the object to be processed. It is more preferable to control the processing object supply device 6, the combustion device 3, and the primary air supply device 4 based on the determination result of the determination means 9 that determines that the processing object contains combustibles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining the properties of a material to be melted, a method for operating a surface melting furnace, and a control device, and more particularly, to heat generated by burning combustibles in a main chamber. In a surface melting furnace for melting an incombustible material as an object to be charged into the furnace, a method for determining the property of the material to be melted for determining the property related to the flammability of the object to be charged into the surface melting furnace, and the surface melting The present invention relates to a furnace operation method and a control device.

[0002]

2. Description of the Related Art Conventionally, in a surface melting furnace, as shown in FIG. 6, for example, as an object to be treated introduced into the main chamber 2 by heat generated by burning a combustible material in the main chamber 2. , And the properties of the object to be treated are not determined in a furnace. In the illustrated example, an outer wall portion 11 having a cylindrical inner surface is provided upright on a bottom portion 10 of the main chamber 2, and a ceiling portion 12 of the main chamber 2 is formed separately from the bottom portion 10. An inner wall portion 13 having a cylindrical outer surface is provided upright on the outer peripheral portion of the ceiling portion 12, and the inner wall portion 1 is provided.
3 is arranged coaxially with the outer wall 11 inside the outer wall 11 so as to rotate relative to the outer wall 11 about an axis. The object to be processed is configured such that an annular space formed between the outer wall portion 11 and the inner wall portion 13 is set as an object loading space 14 and the object to be processed from the object loading mechanism 15 is processed by the object. It was configured to be supplied into the processing object loading space 14. In order to maintain the inside of the main chamber 2 at a predetermined temperature (for example, 1300 ° C.), the ceiling 12 has a combustion device 3 for supplying fuel as the combustible material into the main chamber 2, A burner 17 connected to primary air supply means 4 for supplying primary air for burning objects is arranged.
Temperature detecting means 16 comprising a thermocouple for detecting the temperature in the furnace heated by the combustion heat of the fuel from the main chamber 2 and the fuel and primary air are detected by the temperature detecting means 16. It is adjusted according to the temperature to be detected. The processing object supplied into the processing object loading space 14 forms a deposition layer 5 in the processing object loading space 14, and the processing object supply device 6 removes the deposition layer 5 from the deposition layer 5. It is put into the chamber 2, and the furnace inner surface 5a of the deposition layer 5 is formed in a mortar shape. In the illustrated example, the workpiece supply device 6
A cutting blade 6 </ b> A is provided at the lower end of the inner wall portion 13 and relatively rotates around the axis of the inner wall portion 13 with respect to the bottom portion 10. The object to be processed, which is located at the lower end of the inner wall 13, is thrown into the main chamber 2. This surface melting furnace 1
Is set for a predetermined amount of processing determined based on the required amount of processing, the amount of processing is confirmed by the amount of slag discharged, and this is adjusted according to the confirmed amount of processing. It is configured to be adjusted by the rotation speed of the outer wall 11 erected on the bottom 10.

[0003]

In recent years, even in surface melting furnaces, for example, combustibles (eg, chars), which are residuals of dry distillation of an object to be treated, are introduced into the furnace together with non-combustibles, and wastes to be treated at the same time are treated. Attention has been paid to processing methods. However, in the above-mentioned conventional surface melting furnace 1, if the properties of the object to be treated change, that is, if the object to be treated contains combustibles such as dry distillation residues represented by the char, Since the combustibles located on the furnace inner surface 5a burn, the amount of the object to be processed is greatly reduced. As the weight loss increases, the furnace inner surface 5a of the deposition layer 5 recedes, and at the same time, the upper surface of the deposition layer 5 in the processing object charging space 14 decreases, and the annular shape on the deposition layer 5 There is a possibility that an undesired state in which the space communicates with the main chamber 2 may occur. The illustrated surface melting furnace 1 is provided with temperature detecting means 16 using a sheath-type thermocouple for detecting the temperature in the main chamber 2, and the main chamber temperature detected by the temperature detecting means 16 and the main chamber Melting control means 7 having arithmetic means 7a for adjusting the opening of the fuel control valve 3a to the combustion device 3 and the primary air control valve 4b provided in the primary air supply means 4 based on the target temperature of 2
There is provided combustion control means 18 functioning as. The calculating means 7a includes a main chamber temperature, a constant pressure specific heat of the exhaust gas from the main chamber 2, a flow rate of the exhaust gas from the main chamber 2, a lower heating value of the fuel supplied to the main chamber 2, The temperature of the fuel supplied to the chamber 2, the specific heat at a constant pressure of the fuel, the constant pressure specific heat of the air supplied to the combustion device 3, that is, the main chamber 2 with the addition of the fuel, the temperature of the air, and the temperature of the fuel. Calculating a fuel additional amount required to maintain the inside of the main chamber at the target temperature based on a theoretical air amount coefficient for the additional amount and a predetermined air ratio to fuel in the main chamber; The opening of the fuel control valve 3a is adjusted so that the fuel addition amount calculated in 7a is supplied to the combustion device 3, and the inside of the main chamber 2 is controlled by a predetermined amount with the adjustment of the opening of the fuel control valve 3a. Opening of the primary air control valve 4b to maintain the air ratio It has configured the combustion control means 18 to regulate.

[0004] However, since it is not configured to judge the properties of the charged object in the furnace, in the surface melting furnace 1 described above, if the amount of combustible material in the object increases, A primary control for preventing the furnace inner surface 5a from retreating due to the burning of the combustible material on the furnace inner surface 5a by only the combustion control means 18 and for burning the combustible material in the workpiece; It is difficult to adjust the air volume. Therefore, as described above, it is difficult to put the object to be treated including combustibles into the furnace and to properly maintain the combustion state in the main chamber 2. Therefore, as shown in FIG. 7, the applicant previously provided a burner 17 at the center of the ceiling 12 toward the lower main chamber 2, and further provided a burner 17 on the side of the ceiling 12. An inspection window for temperature measurement is provided, and an infrared radiation thermometer 8 is provided as a surface temperature detecting means 8 to face the inspection window.
A is disposed in the surface melting furnace 1 in which the position A is adjusted, the posture is adjusted toward the peripheral portion of the slag outlet of the bottom portion 10, and the slag surface on the peripheral portion is adjusted to be focused. A melting furnace was proposed (Japanese Patent Application No. 9-289456). The waste melting furnace is provided above the workpiece loading space 14 and hermetically connects the outlet of a workpiece loading mechanism 15 composed of a screw feeder 15A to the waste melting furnace. In order to stably feed the workpiece into the main chamber 2 from the charging space 14, as a workpiece supply device into the main chamber 2, at a predetermined position at the lower end of the inner wall portion 13, The cutting blade 6 </ b> A that rotates relatively to the deposition layer 5 is provided as a processing object supply device. Further, in order to constantly maintain the position of the layer of the molten slag on the furnace inner surface 5a of the workpiece supplied by the screw feeder 15A, the speed of the screw feeder 15A and the heat input from the combustion device 3 are set. A combustion control means 18 having a function of adjusting both is provided. The combustion control means 18
A fuel regulating valve 3a provided in a fuel supply path to the combustion device 3 for stably maintaining the furnace temperature, and a primary air for feeding primary air toward the combustion device 3; Primary air control valve 4 provided in air supply means 4
b is adjusted under predetermined conditions, and at the same time, the rotational speed of the screw feeder 15A is also adjusted to adjust the amount of the object to be processed. In the above-described surface melting furnace, the infrared radiation thermometer 8 </ b> A is also fixed to the ceiling 12, but also rotates relative to the bottom 10 with the relative rotation with respect to the outer wall 11. Since the measuring point of the thermometer 8A rotates over the entire circumference along the periphery of the slag port, if the average value of the measured temperature is taken in synchronization with the rotation of the outer wall portion 11, it is 1 as it is.
The average value in the circumferential direction of the periphery of the slag port can be known from the average value during the rotation. The retreat of the inner surface of the furnace of the deposition layer 5 can be detected from the change in the average temperature.

[0005] However, in the waste melting furnace, even if it can be detected that the combustibles in the object to be treated have burned due to the retreat of the furnace surface of the deposition layer 5, the temperature in the main chamber 2 is low. The furnace inner surface 5a was too high.
May recede, and there is still a problem in controlling the combustion of combustibles in the object.

Therefore, a method for determining the properties of a material to be melted, a method for operating a surface melting furnace, and a control device according to the present invention solves the above-mentioned problems, and the method according to the present invention is applied to a case where a combustible material is put into the material to be processed together with an incombustible material. Another object is to provide means for stably maintaining the combustion of combustibles and the melting of incombustibles in the main chamber.

[0007]

SUMMARY OF THE INVENTION [Characteristic Means and Operation and Effect of Method for Determining Property of Molten Material] The first characteristic means of the method for determining the property of a material to be melted according to the present invention for the above object is described in claims. As described in 1, a surface temperature of an input portion of an object to be treated introduced into the main chamber is detected, and a combustible substance and an incombustible substance are identified based on a fluctuation state of the detected temperature within a predetermined time. It is in. In addition, if the temperature detected by the first characteristic means falls within a predetermined time after exceeding a predetermined temperature difference and then rises within a predetermined temperature range, the loaded object to be processed is provided. It is even better if it is determined that contains combustibles (second characteristic means).

According to the first feature, the object to be processed is
Can detect the characteristics of temperature change when there is a burning substance
From the above, it is appropriate to burn the combustible
Combustion conditions can be maintained. In other words, this is based on the knowledge of the inventor.
This is based on the
If the surface temperature of the entry site is detected,
If the object is only non-combustible, an example of temperature change is modeled.
As shown in FIG. 3A shown in FIG.
The surface temperature Ts is the standard furnace temperature Tfs (for example, 1300 ° C.)
Equilibrium with the furnace temperature Tf fluctuating up and down
T₀Fluctuates somewhat up and down, but shows a stable temperature. This
On the other hand, combustibles are contained in the input object to be treated.
In this case, FIG. 3 schematically shows an example of a temperature change.
(B) As shown in FIG.
Degree Ts is the temperature of the main room immediately after the object is charged.
The temperature once drops below a certain temperature difference with respect to Tf. Its decline
Temperature falls within a certain area, and
The upper limit is the steady surface temperature T₀Below and its temperature range
Is lower than the steady surface temperature T.₀Lower, said main room
First temperature T lower than internal temperature Tf by a certain temperature difference₁
And a second temperature T lower by a specific temperature difference._TwoBetween
Within the range. The surface of the input portion of the object to be treated
After that, the temperature Ts is set such that incombustible substances are thrown within a certain time period.
The same temperature as the surface temperature Ts of the part when
The steady surface temperature T₀And the first temperature T ₁Temperature between
Returned to the area. Based on this knowledge, the above-mentioned certain
Within the time of
Therefore, it is possible to determine the properties of the object to be processed.
It is. If this phenomenon is estimated,
The combustibles in the newly supplied workpiece are exposed to the high temperature inside the furnace.
And burns, and the surface of the charging site
The surface temperature once drops because the workpiece is exposed.
It is inferred that after that, the surface
Is formed once by the incombustible material remaining after the
The temperature rises by touching the temperature of
It can be considered as an indicator of degree. This heated
If the fuel melts, the melt will flow down, making it newly flammable
The object to be treated including the object is exposed on the surface of the charging site,
Assuming that the phenomenon repeats, the behavior of the surface temperature
I can explain for a while. Incidentally, the structure of the second characteristic means described above.
The composition is based on the knowledge of the inventor, and
It can be easily determined whether or not any combustible material is contained in the. One
That is, for example, as shown in FIG.
The first temperature T₁Of the main room temperature Tf
Instead of the difference, the main room temperature Tf is a representative value of the main room temperature Tf.
Steady surface temperature T₀The temperature difference with respect to the predetermined temperature difference ΔT
And the input portion presented in the case of an object to be processed containing only incombustibles
The steady-state surface temperature T instead of the surface temperature Ts₀And the said
First temperature T₁A predetermined temperature range R_Tage
Therefore, when a certain time in the above knowledge is
I just need to. With this configuration, the object to be processed is
If there is no flammable material in the
Is the steady surface temperature T₀Almost stable,
Even if the temperature is reduced, the minimum temperature is the predetermined temperature range R_TStay in
If the object to be treated contains combustibles,
Once the predetermined temperature difference ΔT
Above the first temperature T₁Because it drops below
If such a temperature change is detected, the workpiece contains combustibles.
It can be determined that it is rare. The main room temperature
If the change with time of Tf is large, the above-mentioned steady surface temperature
T₀Substituting the moving average value of the main room temperature Tf into
Good.

[Characteristic means and operation effect of the method for operating the surface melting furnace] The characteristic means of the method for operating the surface melting furnace according to the present invention for the above object are as described in claim 3. Based on the property of the workpiece determined based on the first characteristic means or the second characteristic means of the property determining method, at least the amount of the workpiece to be charged into the main chamber, the primary air supply amount, and the fuel supply amount The point is to set one of them.

[0010] In the characteristic means of the method for operating the surface melting furnace constructed as described above, the first characteristic means or the second characteristic means of the above-described method for judging the property of the material to be melted is applied to the charging section charged into the main chamber. Since it is determined whether or not a combustible material is contained in the processed material, a change in the amount of combustible material in the main chamber can be known from the result of the determination, and a change in the weight reduction of the processed material in the main chamber. To predict the change in the amount of heat required for the melting treatment of incombustibles in the main chamber,
Alternatively, it is possible to predict a change in the amount of primary air required for combustion of the combustibles in the main chamber. Therefore, according to the prediction, the amount of the object to be treated or the amount of primary air supplied to the main chamber or the fuel supply By adjusting what is needed within the amount, the melting treatment of the object can be smoothly performed. In particular, according to the second characteristic means of the method for judging the property of the material to be melted, it is surely found that the combustible material is contained in the material to be processed, so that the fuel supply amount is reduced and the fuel supply is reduced. By increasing the ratio of the amount of primary air to the amount, that is, by increasing the air ratio to fuel, the combustibles in the object to be treated are actively burned, and can be effectively used for melting incombustibles, If the object to be treated contains combustibles, the amount of the object to be treated in the main chamber is greatly reduced. Therefore, the supply amount of the object to be treated into the main chamber as needed, that is, the object to be treated, If the charging amount is increased, it is possible to prevent the furnace inner surface of the workpiece in the main chamber from retreating excessively. To prevent the furnace inner surface of the object to be treated from retreating excessively, it is also a measure to reduce the amount of primary air.

[Characteristic Configuration and Operation and Effect of Control Device for Surface Melting Furnace] A first characteristic configuration of the control device for a surface melting furnace according to the present invention for the above object is as described in claim 4. Surface temperature detection means for detecting the surface temperature of the input portion of the workpiece supplied to the, based on the temperature detected by the surface temperature detection means, the target supply speed of the workpiece supply device,
The melting control means is configured to adjust at least one of the target fuel supply amount of the combustion device and the target primary air supply amount of the primary air supply means. In addition, if the temperature detected by the surface temperature detecting means falls within a predetermined time, exceeds a predetermined temperature difference, and then rises within a predetermined temperature range, the object to be processed which has been input is set. Is provided with a determination unit that determines that it contains combustibles, based on the determination result of the determination unit, a target supply speed in the workpiece supply device, a target fuel supply amount in the combustion device,
It is further preferable that the melting control means is configured to adjust at least one of the target primary air supply amount in the primary air supply means. [Function and effect of first characteristic configuration] The first characteristic configuration is that the control apparatus for the surface melting furnace has the first method of determining the property of the material to be melted.
The method is characterized by applying the characteristic means of the method for operating the surface melting furnace based on the characteristic means, wherein the surface temperature detection means detects the surface temperature of the processing object input site in the main chamber, and the processing object input site Since the properties of the object to be treated can be determined, the melting control means makes this determination and, based on the result of the determination, determines the target supply speed of the workpiece supply device, the target fuel supply amount of the combustion device, and the primary fuel supply amount. The target primary air supply amount of the air supply means is adjusted alternatively, or two of them are adjusted. Therefore,
Since it is possible to detect a characteristic of a temperature change when a combustible is contained in the object supplied to the main chamber, appropriate combustion conditions for burning the combustible in the object in the main chamber are maintained. it can. Further, the second characteristic configuration is obtained by applying the characteristic means of the operation method of the surface melting furnace based on the second characteristic means of the property determination method of the material to be melted to the control device of the surface melting furnace. Since it is possible to easily determine whether or not a combustible substance is contained in the object, the determination unit determines whether or not the combustible substance is included in the object to be processed, and the melting control unit based on the determination result. Alternatively, the target supply speed of the treatment object supply device, the target fuel supply amount of the combustion device, and the target primary air supply amount of the primary air supply means can be selected, or two of them, or Adjust. For example, when the determination means determines that the combustible is contained in the object to be processed, the melting control means adjusts the target fuel supply amount to a decrease side and increases the target primary air supply amount. By adjusting to the side, the combustibles in the object to be treated are actively burned in the main chamber and can be effectively used for melting the non-combustible substances, and the amount of the object to be treated in the main chamber is greatly reduced. Regarding the point, if the target supply speed is increased, it is possible to prevent the furnace inner surface of the workpiece in the main chamber from retreating excessively. To prevent the furnace inner surface of the workpiece from retreating excessively, the target primary air supply amount may be reduced.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The method for determining the properties of a material to be melted, the method for operating a surface melting furnace, and the implementation of a control device according to the present invention will be described below with reference to the drawings using an example of a surface melting furnace. I do. FIG. 1 is a longitudinal sectional view showing a configuration of a surface melting furnace according to the present invention, FIG. 2 is a flowchart showing an example of melting control according to the present invention, and FIG. 3 is a behavior of a surface temperature at a charging site in the furnace. It is a diagram which shows as a tendency.
The same elements as those described in the related art and elements having the same functions are denoted by the same reference numerals as those in FIGS. 6 and 7, and a part of the detailed description is omitted. .

The surface melting furnace is, for example, as shown in FIG.
An outer wall portion 11 having a cylindrical inner surface formed on a bottom portion 10 of the main chamber 2.
And an inner wall portion 13 having a cylindrical inner surface formed on an outer peripheral portion of a ceiling portion 12 of the main chamber 2 separate from the bottom portion 10, and a coaxial core is provided inside the outer wall portion 11. The inner wall part 1
3, an annular space between the inner wall portion 13 and the outer wall portion 11 is formed in the workpiece loading space 14, and the outer wall portion 11 is configured to rotate around an axis. A screw feeder 15 is provided above the workpiece loading space 14.
A processing object loading mechanism 15 made of A is arranged and connected to the processing object loading space 14 in an airtight manner. The processing object supplied from the screw feeder 15 </ b> A forms the deposition layer 5 on the bottom 10 in the processing object loading space 14. At the lower end of the inner wall portion 13, a cutting blade 6 </ b> A is attached as the workpiece supply device 6, and at the position of the lower end portion of the inner wall portion 13, the cutting blade 6 </ b> A is attached around the axis of the outer wall portion 11. By rotating relative to the bottom portion 10, the processing object cut out from the deposition layer 5 of the processing object by the cutting blade 6 </ b> A, the furnace inner surface 5 a of the deposition layer 5 is placed in the main chamber 2. The non-combustible material on the furnace inner surface 5a is melted by heat generated by burning combustible material in the main chamber 2 in a mortar shape. In the central part of the bottom part 10, there is provided a slag outlet for discharging the molten slag in which the object to be treated on the furnace inner surface 5a is melted through a secondary chamber.

The ceiling section 12 includes a combustion device 3 for burning combustibles in the main chamber 2 to heat the supplied workpiece, and a fuel containing fuel supplied from the combustion device 3. Primary air supply means 4 for supplying primary air for burning combustibles in the main chamber 2 into the main chamber 2;
Fuel and primary air from both are burned into the main chamber 2 by a burner 1.
7. A combustion control means 18 for controlling both the combustion device 3 and the primary air supply means 4 on the basis of a target supply amount of both, so as to maintain the temperature in the main chamber 2 at a predetermined temperature; Melting control for adjusting and controlling at least one of the target supply amounts of the two in the combustion control means 18 and the target supply speed in the treatment object supply device 6 with respect to the treatment object supply device 6. Means 7 are provided. The surface temperature T of the site where the object to be processed supplied to the main chamber 2 is introduced into the ceiling 12
a target temperature of the workpiece supply device 6, a target fuel supply amount of the combustion device 3, and a surface temperature detection means 8 for detecting s and a surface temperature Ts detected by the surface temperature detection means 8. The melting control means 7 is configured so that any of the primary air supply means 4 and the target primary air supply amount can be adjusted.

A determination means 9 is provided for giving conditions for adjusting the target supply speed, the target fuel supply amount, and the target primary air supply amount to the melting control means 7. If the detected temperature decreases within a predetermined time after exceeding a predetermined temperature difference and then increases within a predetermined temperature range, it is determined that the inputted object to be processed contains combustibles. The melting control means 7 includes:
On the basis of the determination result of the determination means 9, at least one of the target supply speed, the target fuel supply amount, and the target primary air supply amount is adjusted. Which of the three target values is to be adjusted,
If the melting control means 7 is provided with a function of making a judgment in accordance with the state of the furnace, it can be automatically controlled and is convenient.

The combustion device 3 is provided with a fuel control valve 3a for adjusting the amount of fuel supplied into the main chamber 2, and the primary air supply means 4 is provided with a primary air supply means 4 for supplying primary air to the main chamber 2. A primary air control valve 4b for adjusting the amount is provided. The opening of both the fuel control valve 3a and the primary air control valve 4b is adjusted by the combustion control means 18. The object to be processed introduced into the object to be processed space 14 from the object to be processed supply device 6 forms the deposition layer 5 on the bottom 10 and the processing object to form the deposition layer 5. Is cut out by the cutting blade 6A toward the furnace inner surface 5a at the charging site facing the inside of the main chamber 2. Here, the target supply speed is set as a relative rotation speed of the cutting blade 6A with respect to the bottom portion 10, and the outer wall portion 11 is driven to rotate at the set target rotation speed. The target fuel supply amount is set as a target opening of the fuel control valve 3a, and the target primary air supply amount is set as a target opening of the primary air control valve 4b. The melting control means 7 normally detects the temperature in the main chamber 2 by the temperature detecting means 16 provided in the ceiling portion 12 and changes the detected furnace temperature Tf to a preset standard furnace temperature Tfs. The combustion control means 1 for making the furnace temperature Tf closer to the standard furnace temperature Tfs and optimizing for a preset melting condition.
8 to set the target opening and the target rotational speed of the fuel control valve 3a and the primary air control valve 4b.

In the surface melting furnace 1 described above, the properties of the material to be treated are determined, and the target supply speed, the target fuel supply amount, and the target primary air supply are controlled for melting control of the furnace. The procedure for setting the operation amount for adjusting the amount will be described below with reference to FIG. 3 by using the simplest example along the example of the flowchart shown in FIG. Here, in order to simplify the description, the furnace temperature Tf in the main chamber 1 is set.
Is stably maintained at approximately the standard furnace temperature Tfs. In the surface melting furnace in the following example, the primary air supply amount is adjusted based on a preset air ratio with respect to the fuel supply amount, and the standard of the furnace temperature Tf detected by the temperature detecting means 16 is set. The target degree of opening of the fuel control valve 3a is adjusted by the combustion control means 18 based on the deviation from the furnace temperature, and the primary air control valve 4b is proportionally controlled with respect to the target degree of opening of the fuel control valve 3a. It should be noted that the target rotation speed,
A target opening of the fuel control valve 3a is set. Further, a predetermined temperature range _RT and a predetermined temperature difference ΔT are set in advance. Further, the surface temperature T at the time of melting the incombustibles is
The steady surface temperature T _0, which is a representative value of s, is also determined.

[1] The surface temperature Ts at the charging portion of the object to be processed is detected repeatedly by the surface temperature detecting means 8 and the furnace temperature Tf by the temperature detecting means 16 continuously for a predetermined time (* in FIG. 2). 1 is indicated). [2] In determining means 9, the surface temperature Ts, compared to the furnace temperature Tf and the constant surface temperature T ₀ (in FIG. 2 are denoted by the sign of the * 2 display). (Judgment in the above [2] by the judgment means 9) [2-1] In the judgment means 9, the surface temperature Ts
If the temperature is close to the steady surface temperature T ₀ , or lower than or equal to the furnace temperature Tf and within a range from the furnace temperature Tf to the first temperature T ₁ lower than the furnace temperature Tf by the predetermined temperature difference ΔT (see FIG. 3A). It is determined that the input object is made of non-combustible material and does not contain much combustible material (indicated by the symbol * 2-1 in FIG. 2), and the target opening of the fuel control valve 3a is determined. The procedure returns to the step [1] without adjusting the degree. If the determination in the above procedure [2] is performed after returning from the above procedure [4] to the above [1], the opening reduction correction for the fuel control valve 3a set in the following procedure [3] is performed. After returning the amount and the opening increase correction amount for the primary air control valve 4b set in the following procedure [4] to the initial values, the procedure returns to the above procedure [1]. Enclosed). [2-2] In the determination means 9, the as the surface temperature Ts, if I by detecting the from the furnace temperature Tf predetermined temperature difference ΔT lower first temperature T ₁ of the temperature drops below (Figure 3
(B)), it is determined that the input workpiece contains a large amount of combustibles (indicated by the symbol * 2-2 in FIG. 2), and the following procedure [3] is performed. Execute (setting of the operation amount in the melting control means 7) [3] The melting control means 7 calculates the difference amount of the fuel corresponding to the in-furnace calorific value of the combustible material based on the determination result of the determination means 9. Then, an opening reduction correction amount corresponding to the difference amount is set (indicated by the symbol * 3 in FIG. 2), and the target opening of the fuel control valve 3a is adjusted to the closing side. [4] The difference amount of the primary air required for the combustion of the combustibles is calculated, and the primary air control valve 4b changed according to the target opening of the fuel control valve 3a adjusted in the above [3]. With respect to the target opening, an opening-side opening increase correction amount corresponding to the difference amount of the primary air is set (indicated by the symbol * 4 in FIG. 2), and the primary air regulating valve is set. 4b is adjusted to the open side, and the procedure returns to the above [1].

Next, another embodiment of the present invention will be described. <1> In the above embodiment, FIG.
Although the example in which the fuel from the fuel supply and the primary air from the primary air supply means 4 are both supplied from the burner 17 into the main chamber 2 has been described, for example, as shown in FIG. The primary air is also supplied to a primary air supply nozzle 4a, which is provided separately from the burner 17 and supplies primary air for burning combustibles in an object to be processed directly into the main chamber 2. There may be. In FIG. 4,
The illustration of the surface temperature detecting means 8 and the temperature detecting means 16 is omitted. These may be configured in the same manner as shown in FIG. In the case of such a configuration, the procedure for setting each operation amount for the melting control of the surface melting furnace can be changed as follows, for example, as shown in a flowchart in FIG. In this case, the primary air supply amount in the burner 17 is set by the combustion control means 18 at a predetermined air ratio with respect to the set fuel supply amount.
The target opening of the primary air control valve 4b to the fuel control valve 3a
Is controlled proportionally to the target opening degree, and the opening degree is not corrected. Apart from this, the primary air supply amount to the primary air supply nozzle 4a is adjusted. That is, in the illustrated example, the combustion control means 18 is provided with the furnace temperature adjustment means 18.
The target fuel supply amount is set by the furnace temperature adjusting means 18a so as to maintain the furnace temperature Tf detected by the temperature detecting means 16 at the standard furnace temperature Tfs. The target opening of the fuel control valve 3a is set, and the primary air control valve 4b to the burner 17 is proportionally controlled. The combustion control of the combustibles in the processing object is performed in the following procedure. In the melting control means 7. As described below, the procedures of [1] and [2] are as follows.
This is the same as shown in the above embodiment. [1] The surface temperature Ts at the charging site of the workpiece is detected by the surface temperature detecting means 8 and the furnace temperature Tf is detected by the temperature detecting means 16.
Then, each of them is repeatedly detected for a predetermined period of time (in FIG. 5, the symbol * 1 is attached). [2] In determining means 9, the surface temperature Ts, compared to the furnace temperature Tf and the constant surface temperature T ₀ (in FIG. 5 are denoted by the sign of the * 2 display). (Judgment in the above [2] by the judgment means 9) [2-1] In the judgment means 9, the surface temperature Ts
If the temperature is close to the steady-state surface temperature T ₀ or within a range from the furnace temperature Tf to the first temperature T ₁ lower than the furnace temperature Tf by the predetermined temperature difference ΔT or more (see FIG. 3A). ), It is determined that the input object is made of non-combustible material and does not contain much combustible material (indicated by the symbol * 2-1 in FIG. 5), and the target of the fuel control valve 3a is determined. The procedure returns to the procedure [1] without adjusting the opening. In addition, the following [4]
When the determination is made in the procedure of [2] after returning from the procedure [1] from the procedure [1], the opening reduction correction amount for the fuel control valve 3a set in the procedure of [3] below and the following [4] After returning the target opening of the primary air control valve 4c to the primary air supply nozzle 4a set in the procedure [1] to the initial value, the procedure returns to the procedure [1] above (in FIG. 5, the area surrounded by a thick dashed line is shown). Shown). [2-2] In the determination means 9, the as the surface temperature Ts, if I by detecting the furnace temperature Tf than the predetermined temperature difference lower first temperature T ₁ of below lowered temperature or higher [Delta] T (FIG. 3 ( B), it is determined that the thrown object contains a large amount of combustible materials (indicated by the reference numeral * 2-2 in FIG. 5), and the following [3] and subsequent steps are executed. (Setting of the operation amount in the melting control means 7) [3] The melting control means 7 calculates the difference amount of the fuel corresponding to the in-furnace calorific value of the combustible material based on the determination result of the determination means 9. Then, an opening reduction correction amount corresponding to the difference amount is set (indicated by the symbol * 3 in FIG. 2), and the target opening of the fuel control valve 3a is adjusted to the closing side. [4] A difference amount of primary air required for combustion of the combustibles is calculated, and a target primary air supply amount to the primary air supply nozzle 4a is set (in FIG. 2, a reference sign of * 4 is attached). ), The primary air supply valve 4c to the primary air supply nozzle 4a is adjusted to the open side, and the procedure returns to the above [1]. According to the above configuration, the maintenance of the furnace temperature and the response to the change in the amount of combustibles in the processing object can be performed independently and independently, so that more detailed melting control can be performed. <2> In the above embodiment, the cutting blade 6A is attached to the lower end of the inner wall 13 as the workpiece supply device 6,
At the position of the lower end of the inner wall portion 13, the cutting blade 6A
Is rotated relative to the bottom portion 10 around the axis of the outer wall portion 11 so as to be cut out from the deposition layer 5 of the treatment object by the cutting blade 6A.
Although the example in which the furnace inner surface 5a is formed has been described, the outer wall portion 11 is relatively fixed without rotating the outer wall portion 11 relative to the inner wall portion 13 and only the cutting blade 6A is used. Along the lower end of the inner wall 13, the inner wall 13 may be rotated around the axis of the inner wall 13 with respect to the bottom. <3> In the above embodiment, the cutting blade 6A is attached to the lower end of the inner wall 13 as the workpiece supply device 6,
At the position of the lower end of the inner wall portion 13, the cutting blade 6A
Is rotated relative to the bottom portion 10 around the axis of the outer wall portion 11 so as to be cut out from the deposition layer 5 of the treatment object by the cutting blade 6A.
Although the example in which the furnace inner surface 5a is formed has been described, the workpiece supply device 6 may be configured by means other than the cutting blade 6A. For example, a pusher or a screw feeder may be arranged in the deposition layer 5 so that the object to be processed is sent out from the deposition layer 5 toward the main chamber 2, and an upper end portion of the furnace inner surface 5a may be provided. As long as the object to be processed can be supplied into the main chamber 2 at the position (1), any means can be used as the object supply device 6. In short, it suffices if the surface temperature detecting means 8 can be configured so as to be able to detect the temperature of the furnace inner surface 5a at the charging site. <4> In the above-described embodiment, an example has been described in which the supply amounts of the fuel and the primary air supplied into the main chamber 2 via the burner 17 are adjusted in accordance with the result of the determination by the determination means 9. Only the supply amount of the primary air may be adjusted. Also,
The supply speed of the object to be processed by the object to be processed supply device 6 may be adjusted at the same time. For example, if the determination means 9 determines that the object to be processed contains a combustible material, An input amount adjusting means 19 (for example, see FIG. 4) for increasing the speed of the material supply device 6 may be provided. If a surface detecting means for detecting the position of the furnace inner surface 5a in the main chamber 2 is provided,
The charging amount adjusting means 19 may be configured to control the workpiece supply device 6 so as to maintain the furnace inner surface 5a detected by the surface detecting means at a predetermined position. <5> In the above-described embodiment, an example has been described in which the decrease correction amount of the fuel supply amount is set and the increase correction amount for the target primary air supply amount set by the corrected fuel supply amount is set. Alternatively, the correction amount may be set for any one of the target supply amounts of the fuel and the primary air and the target supply speed of the object to be processed or a plurality of the target supply speeds depending on the situation in the main chamber 2. Good. For example, the melting control means 7
Is provided with an arithmetic means 7a composed of a neurocomputer, and from the respective process data including the surface temperature of the input part detected by the surface temperature detecting means 8, each correction amount is calculated and derived by the arithmetic means 7a based on the learning result. It may be configured as follows. <6> In the above description, the case has been described in which the property relating to the flammability of the object to be treated is determined as the presence or absence of a combustible material by the determination means 9; It is even better if the configuration is such that the abundances of are determined simultaneously. For example, the lower limit temperature (for example, the second temperature T ₂ in FIG. 3) at which the surface temperature of the charging site is reduced when the combustible material is included in the object to be treated, and the standard furnace temperature Tfs
It may be configured to detect a change in the abundance of the combustible material based on a change in the difference from (see FIG. 3).

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a configuration of an example of a surface melting furnace according to the present invention.

FIG. 2 is a flowchart showing an example of a melting control procedure in the surface melting furnace shown in FIG.

FIG. 3 is a diagram showing the behavior of the surface temperature at the charging site in the surface melting furnace.

FIG. 4 is a longitudinal sectional view illustrating a configuration of another example of the surface melting furnace according to the present invention.

5 is a flowchart showing an example of a melting control procedure in the surface melting furnace shown in FIG.

FIG. 6 is a vertical sectional view of a furnace for explaining an example of melting control in a conventional surface melting furnace.

FIG. 7 is a vertical cross-sectional view of a furnace for explaining another example of melting control in a conventional surface melting furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface melting furnace 2 Main chamber 3 Combustion device 4 Primary air supply means 6 Processing object supply apparatus 7 Melting control means 8 Surface temperature detection means 9 Judgment means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01N 25/02 B09B 3/00 303K F term (Reference) 2G040 AB12 BA02 BA25 CA02 CA12 CA23 CB03 DA05 DA12 EA03 EB02 GA04 ZA08 3K061 AA05 AB03 AC01 BA01 BA03 BA06 CA01 DB06 DB20 3K062 AA05 AB03 AC01 BA02 CB03 DA01 DA40 DB03 DB06 4D004 AA46 CA24 CA29 DA01 DA02 DA06 DA12

Claims (5)

[Claims] 1. A surface melting furnace (1) for melting an incombustible material as an object to be processed, which is introduced into the main chamber (2), by heat generated by burning combustibles in the main chamber (2). In the above, there is provided a method for judging the property of a material to be melted for determining the property of combustibility of the material to be thrown into the surface melting furnace (1), wherein the material to be thrown into the main chamber (2). A method for determining the property of a material to be melted, which detects a surface temperature of a charging portion of the object and discriminates a combustible substance and an incombustible substance based on a fluctuation state of the detected temperature within a predetermined time. 2. If the detected temperature falls within a predetermined time after exceeding a predetermined temperature difference and then rising within a predetermined temperature range, it is determined that the thrown object contains combustibles. The method for determining the property of a material to be melted according to claim 1. 3. A method for operating a surface melting furnace for melting an object to be treated introduced into the main chamber (2) by heat generated by burning a combustible material in the main chamber (2), The main chamber (2) based on the property of the object determined based on the property determination method of the object according to claim 1 or 2.
A method for operating a melting furnace, wherein at least one of an input amount of an object to be processed, a primary air supply amount, and a fuel supply amount is set. 4. A processing object supply device (6) for supplying the input processing object into the main chamber (2), and combustible material is burned in the main chamber (2) to supply the processing object. A combustion device (3) for heating an object to be treated, and primary air for burning combustibles in the main chamber (2) containing fuel supplied from the combustion device (3). And a primary air supply means (4) for supplying the inside of the main chamber (2), and in order to maintain the temperature in the main chamber (2) at a predetermined temperature, the object supply device (6).
A melting furnace control device comprising a melting control means (7) for adjusting and controlling at least one of the combustion device (3) and the primary air supply means (4), wherein the main chamber (2) Surface temperature detecting means (8) for detecting the surface temperature of the input portion of the processing object supplied to the apparatus, and the processing object supply device (6) based on the temperature detected by the surface temperature detecting means (8). , The melting control means (3) so as to adjust at least one of the target supply speed of the combustion device (3), the target fuel supply amount of the combustion device (3), and the target primary air supply amount of the primary air supply means (4). 7. A control device for a melting furnace, which constitutes 7). 5. After the temperature detected by said surface temperature detecting means (8) drops within a predetermined time and exceeds a predetermined temperature difference,
When the temperature rises within a predetermined temperature range, there is provided a determining means (9) for determining that the inputted object to be treated contains combustibles, and the target supply speed is determined based on the determination result of the determining means (9). The control apparatus for a melting furnace according to claim 4, wherein the melting control means (7) is configured to adjust at least one of the target fuel supply amount and the target primary air supply amount.