JP6305803B2 - Surface melting furnace and method of operating surface melting furnace - Google Patents

Description

  The present invention relates to a surface melting furnace and a method for operating the surface melting furnace.

  The surface melting furnace includes a furnace chamber in which an outlet is formed, and a workpiece supply mechanism that supplies a workpiece to the furnace chamber, and is supplied to the furnace chamber by the workpiece supply mechanism. The processed object is melted from the surface and flows down to the tap outlet.

  The supply amount of the object to be processed by the object supply mechanism needs to be adjusted so that the object to be processed to be melted in the surface melting furnace has a target processing amount. The amount of slag that is measured and melted is measured after the fact, and in a certain period of several hours to half a day, it is judged whether the supply is insufficient or excessive from the ratio of the slag amount to the supply amount of the treatment object. The supply amount and the melting conditions were adjusted so that the supply amount became the target processing amount.

  However, since the time delay of several hours occurs between the supply amount of the workpiece to be measured before melting and the slag amount measured after melting, the above-described determination takes time. Therefore, a supply shortage state in which the melt surface profile of the object to be processed retreats from the outlet to the object supply mechanism side, and the melt surface profile of the object to be processed advances to the outlet and the object to be processed accumulates thickly. There was a situation in which the judgment of both of the excessive supply states was delayed, and the state where an appropriate melting surface profile could not be maintained continued.

  When the melting surface profile moves backward from the tap, there is a problem that the consumption of the refractory provided at the bottom of the furnace is accelerated and the life of the refractory in the furnace is shortened. An inconvenient situation occurs in which the unmelted workpiece is discharged to the tap outlet so as to roll down from the inclined surface having a large slope and formed toward the tap outlet.

  Therefore, at present, the melting furnace has a sufficient margin so that the target processing amount can be melted in an insufficient supply state rather than an excessive supply state so that unmelted workpieces are not discharged from the outlet. Was designed and operated.

  In Patent Document 1, the emission wavelength is shorter than the short wavelength end of the emission spectrum of a predetermined intensity or higher in the melting furnace in order to enable stable melting processing by maintaining the melting surface of the object to be processed at an appropriate position. A light beam having a wavelength is irradiated onto the molten surface of the workpiece, the position is detected by an optical sensor capable of detecting the position of the beam spot of the light beam on the molten surface, and the position of the molten surface is detected based on the position detection result. When it is determined that the position is moving forward from the appropriate position, the supply amount per unit time to the melt processing region of the workpiece is reduced, and conversely, when it is determined that the position is moving backward, A melting surface control method is disclosed in which the supply amount per unit time of a workpiece to be melted is increased.

JP-A-11-325434

  However, since the surface melting furnace disclosed in Patent Document 1 uses a very expensive laser having an emission wavelength in the ultraviolet region as a light source, a large number of lasers cannot be installed, It was difficult to estimate the profile.

  In view of the above-described problems, an object of the present invention is to provide a surface melting furnace and a method for operating the surface melting furnace capable of estimating a melting surface profile over a wide range.

In order to achieve the above-mentioned object, the first characteristic configuration of the surface melting furnace according to the present invention is as described in claim 1 of the present invention. A workpiece supply mechanism for supplying the workpiece to the workpiece, and the workpiece supplied to the furnace chamber by the workpiece supply mechanism is melted from the surface and flows down to the outlet. A surface melting furnace that is to be processed based on the temperature of the upper part of the supply section to the furnace chamber of the object to be processed by the object supply mechanism for estimating the melting surface profile of the object to be processed A temperature sensor for determining whether the melted surface of the object is in a backward phase or a forward phase, and a contact sensor for measuring the surface height of the workpiece on the outlet side from the temperature sensor. There is in point.

When the melt surface of the workpiece is retreated, the temperature of the supply section rises due to the influence of the furnace chamber temperature. To do. Therefore, based on the temperature information of the supply unit measured by the temperature sensor, it can be determined whether the molten surface is in the backward phase or the forward phase, which is important measurement information for estimating the profile of the molten surface. Moreover, it can be judged whether the molten surface of a to-be-processed object is a backward phase or a forward phase based on the surface height of the to-be-processed object in the spout opening side from the temperature sensor detected by the to-be-contacted sensor. Therefore, the temperature of the feed section the upper portion of the furnace chamber of the object detected by the temperature sensor, based on the surface height of the object at the tapping port side than the temperature sensor detected by the contact sensor, the The melting surface profile can be estimated appropriately based on whether the molten surface of the processed material is in the backward phase or the forward phase, and thereby it can be properly determined whether or not the molten surface is in an appropriate state. The

The second feature structure, as described in the claim 2, in addition to the first feature configuration described above, the molten surface of the temperature sensor and the object to be treated that is estimated based on the output of the contact sensor There exists a to-be-processed object supply control part which controls the supply amount of the to-be-processed object supplied to the said furnace chamber by the said to-be-processed object supply mechanism at least based on a profile .

Wherein the temperature sensor and the estimated profile of the melt surface of the object with the object to be treated supply control unit on the basis of the output of the contact sensor, the melt surface whether in located in either the forward aspect the recession is determined. When it is determined that the molten surface is in a backward phase, the supply amount of the workpiece is adjusted to increase so that the target supply amount is determined so as to obtain an appropriate molten surface profile, and the molten surface is advanced. If it is determined that the supply amount of the object to be processed is reduced, the supply amount of the object to be processed is adjusted so that the target supply amount is determined to be an appropriate melt surface profile.

The third feature structure, as described in the claim 3, in addition to the first feature configuration described above, the molten surface of the temperature sensor and the object to be treated that is estimated based on the output of the contact sensor Based on the profile , at least the workpiece supply mechanism controls the supply amount of the workpiece supplied to the furnace chamber to the target supply amount, and the cumulative supply amount of the workpiece for a predetermined period is the target accumulation. In other words, the apparatus includes a workpiece supply control unit that corrects the target supply amount so as to obtain the supply amount.

In the second characteristic configuration described above, the supply amount of the object to be processed is adjusted so that the melting surface profile is appropriate, but it is not guaranteed that the result will achieve the target processing amount of the surface melting furnace. . However, according to the workpiece supply control unit of the third characteristic configuration, the target supply amount is corrected so that the cumulative supply amount of the workpiece for a predetermined period becomes the target cumulative supply amount. The target throughput can be achieved.

In the fourth feature configuration, as described in claim 4 , in addition to any one of the first to third feature configurations described above, the inner cylinder integrally formed around the furnace ceiling and the furnace bottom portion An outer cylinder integrally formed around the outer periphery of the inner cylinder and the outer cylinder are arranged concentrically, the workpiece receiving portion is configured in a gap between the inner cylinder and the outer cylinder, and the workpiece supply mechanism is connected to the inner cylinder and the outer cylinder The object is that the workpiece is supplied to the furnace chamber by relative rotation with the cylinder.

  Measure different measurement points to estimate the profile of the melt surface of the workpiece for a rotary surface melting furnace in which the workpiece is fed into the furnace chamber in an annular shape by the relative rotation of the inner cylinder and outer cylinder When multiple sensors are provided, multiple measurement data along the circumferential direction can be obtained with at least one sensor during one revolution of the melting furnace, and a three-dimensional profile of the melt surface can be estimated. The melting surface profile can be estimated.

The characteristic configuration of the method of operating a surface melting furnace according to the present invention is as described in claim 5 , wherein a furnace chamber in which a spout is formed, and a workpiece supply for supplying the workpiece to the furnace chamber And a method for operating the surface melting furnace, wherein the workpiece supplied to the furnace chamber by the workpiece supply mechanism is configured to melt from the surface and flow down to the tap outlet. A temperature sensor for determining whether the molten surface of the workpiece is in the backward phase or the forward phase based on the temperature of the upper part of the supply portion of the workpiece to the furnace chamber by the workpiece supply mechanism; The profile of the molten surface of the workpiece is estimated based on the output of the contact sensor that measures the surface height of the workpiece on the outlet side from the temperature sensor, and at least the workpiece based on the estimation result Workpiece supplied to the furnace chamber by a supply mechanism With the amount of feed is controlled to be the target supply quantity is that a cumulative supply quantity of the object of the predetermined period to correct the target supply quantity so that the target cumulative supply quantity.

  Since the target supply amount is corrected so that the cumulative supply amount of the object to be processed in the predetermined period becomes the target cumulative supply amount, the profile of the melting surface is appropriately adjusted and the target processing amount of the surface melting furnace can be achieved. It becomes like this.

  As described above, according to the present invention, it is possible to provide a surface melting furnace and a method for operating the surface melting furnace capable of estimating a melting surface profile over a wide range.

Illustration of a rotary surface melting furnace according to the present invention Explanatory drawing of a rotary surface melting furnace showing a state in which the melting surface has receded Explanatory drawing of the rotary surface melting furnace showing the state where the melting surface has advanced Explanatory drawing showing sensor placement Illustration of multiple sensors that measure the melt surface height Illustration of a control table based on multiple sensors Explanatory drawing of the several sensor which shows another embodiment and measures melt surface height Explanatory drawing of the several sensor which shows another embodiment and measures melt surface height Explanatory drawing of the several sensor which shows another embodiment and measures melt surface height Explanatory drawing of the several sensor which shows another embodiment and measures melt surface height Explanatory drawing of the principal part of the surface melting furnace which shows another embodiment

Hereinafter, embodiments of the surface melting furnace and the method of operating the surface melting furnace according to the present invention will be described.
FIG. 1 shows a rotary surface melting furnace 1 which is an example of a surface melting furnace. The surface melting furnace 1 is a furnace for melting waste such as incineration ash and sewage sludge, and two combustion burners 10 having an air supply mechanism 11 are installed at a substantially central portion of the furnace ceiling 2. A furnace chamber 4 in which a tap outlet 3 a is formed in the furnace bottom portion 3, a workpiece storage portion 7 provided around the furnace chamber 4, and a workpiece to be processed from the workpiece storage portion 7 to the furnace chamber 4 A workpiece supply mechanism 8 or the like is provided.

  Further, an inner cylinder 5 integrally formed around the furnace ceiling 2 and an outer cylinder 6 integrally formed around the furnace bottom 3 are disposed concentrically, and between the inner cylinder 5 and the outer cylinder 6. The formed space is configured to be the workpiece storage unit 7.

  A connecting portion to the drive mechanism 13 is provided at the lower portion of the outer cylinder 6, and the inner cylinder 5 and the outer cylinder 6 are configured to rotate relative to each other when the outer cylinder 6 is rotated by the drive mechanism 13. A plurality of cutting blades 8 that are components of the mechanism are provided in the lower portion of the inner cylinder 5 along the circumferential direction. The cutting blade 8 is configured by a plate-like inclined blade that guides the workpiece to be processed in a tangential direction in the lower portion of the inner cylinder 5 by the rotation of the outer cylinder 6 to the furnace chamber 4. Due to the relative rotation between the outer cylinder 6 and the outer cylinder 6, the object to be processed, which is accommodated in the object accommodating part 7 by the cutting blade 8, is supplied to the furnace chamber 4 in an annular shape, and the object to be treated becomes a mortar shape in the furnace chamber.

  A boundary between the edge of the cover body 5a extending from the upper part of the inner cylinder 5 toward the outer cylinder 6 and the outer cylinder 6 is sealed with a water sealing mechanism 14, and a double damper mechanism 15a is provided on the upper part of the cover body 5a. The hopper 15 is disposed, and the object to be processed is put into the object to be processed container 7 by the screw conveyor mechanism 16. The furnace ceiling 2, the furnace bottom part 3, the inner cylinder 5 and the outer cylinder 6 are composed of fire walls laminated with fire bricks and the like, and water cooling is performed around the outlets of the furnace ceiling 2 and the furnace bottom part 3 so as to cover the fire walls. A jacket is arranged.

  A water tank for receiving the molten slag in which the object to be treated is melted is disposed below the tap outlet 3a, and a flue is formed in the lateral direction immediately below the tap outlet 3a, and a secondary along the flue Exhaust gas treatment facilities such as a combustion device, a waste heat boiler, an air preheater, a temperature reducing tower, a bag filter, a smoke washing device, and a white smoke prevention device are arranged, and the purified exhaust gas is exhausted from the chimney.

  In addition to incineration residues and incineration fly ash from waste incinerators, animal and plant residues such as sewage sludge, livestock manure, food waste, and combustible waste such as pulverized municipal waste are melt-treated as objects to be treated.

  When the rotary surface melting furnace 1 is started up, the combustion burner 10 is ignited and the furnace chamber 4 is preheated to 1000 ° C. or higher, and then the outer cylinder 6 is rotated via the drive mechanism 13 to start melting the workpiece. To do. Thereafter, the combustion burner 10 is continuously burned, and the furnace chamber and the melting surface become about 1300 ° C. If the object to be treated is combustible waste, the combustion burner 10 is stopped, and then the object to be treated is self-combusted to bring the furnace chamber to 1300 ° C. and continue melting.

  The object to be processed put into the furnace chamber 4 by the cutting blade 8 is melted at a temperature of about 1300 ° C. and flows out toward the tap outlet 3a. The combustion gas is attracted toward the chimney by an induction blower provided on the downstream side of the flue, is subjected to temperature reduction and purification treatment by the above-described exhaust gas treatment facility, and is exhausted from the chimney. The combustion air supplied from the air supply mechanism 11 into the furnace is preheated to about 200 ° C. by an air preheater using hot water or exhaust gas from the boiler.

  FIG. 1 shows a state in which the melt surface profile is melted in an appropriate state, FIG. 2 shows a state in which the melt surface profile is retracted, and FIG. 3 shows a state in which the melt surface profile has been advanced. Has been. In the figure, the hatched portion is the melting surface.

  When the melting surface profile is retracted from the spout 3a, the consumption of the refractory provided at the furnace bottom 3 and the like is accelerated, and the life of the refractory in the furnace is shortened. Further, when the melt surface profile advances to the taphole 3a, it is disadvantageous that the workpiece is discharged to the tapout so as to fall down from the inclined surface having a large slope and formed toward the tapout 3a. Things happen.

  Therefore, the rotary surface melting furnace 1 includes a plurality of sensors Ts and Hs that measure different measurement points in order to estimate the profile of the molten surface of the workpiece, and the measurement points that are different between the plurality of sensors Ts and Hs. Based on the information obtained from the measurement, the profile of the molten surface is appropriately estimated, and accordingly, whether or not the molten surface is in an appropriate state is properly determined, and the amount of the workpiece to be charged into the furnace A workpiece supply control unit 40 is provided for adjusting the process. The plurality of sensors may be the same type of sensor, but it is preferable to combine different types of sensors. The same type of sensor means a sensor having the same detection principle.

One of the sensors includes a non-contact sensor Hs that detects the surface height of the workpiece through the furnace ceiling 2 that covers the furnace chamber 4. Its melt level height h from the furnace roof 2 and the object to be processed is extraordinary free as is detected by the non-contact sensor Hs, one point of at least the melting surface will be able to measure directly. The melting surface height h is the height from the furnace bottom 3 to the surface of the workpiece.

  As the non-contact sensor Hs, an electromagnetic wave type sensor that irradiates microwaves from a trumpet tubular antenna toward the object to be processed and measures the melt surface height h based on the reflection time is suitably used. In addition, as the non-contact sensor Hs, it is also possible to use an optical sensor that irradiates a workpiece with laser light and measures the melt surface height h based on the reflection time. If at least the light for measurement is modulated, the infrared rays from the object to be processed can be removed by the filter, so that it is possible to measure even wavelengths in the infrared region.

  When the object to be treated is combustible waste, it is preferable to irradiate the surface of the melt immediately after being cut into the furnace by the cutting blade 8 with a measurement wave. Pyrolysis is promoted at the temperature in the furnace, and the change in volume becomes remarkable, so that the change state can be easily monitored.

  As shown in FIG. 5, for example, assuming that the profile of the elevation angle θ connecting the edge of the spout 3a and the lower end of the inner cylinder 5 in advance is the reference melt surface profile, the melt surface height h is the reference melt surface profile. If the corresponding melt surface height is h2, it is determined to be appropriate, if h1 is lower than that, it is determined to be a reverse phase, and if it is high, it is determined to be a forward phase. Furthermore, the degree is grasped by the magnitude of the difference value with respect to the melt surface height h2 at that time.

  One of the sensors is composed of a temperature sensor Ts that detects the temperature of the supply portion of the workpiece to the furnace chamber 4 by the cutting blade 8. As shown in FIG. 2, when the melting surface of the workpiece is retreated, the temperature of the supply section rises due to the influence of the furnace chamber temperature, and as shown in FIG. It becomes difficult to be affected by the room temperature, and the temperature of the supply section decreases. Therefore, it is difficult for the molten surface of the workpiece to detect the forward phase, but the backward phase can be accurately detected. A sheath-type thermocouple as a temperature sensor is provided at the lower edge of the inner cylinder 5 and at the end on the workpiece containing portion 7 side.

  That is, based on the temperature information of the supply unit measured by the temperature sensor Ts, it can be determined whether the molten surface has shifted to the backward phase or the forward phase, which is important measurement information for estimating the profile of the molten surface. Especially in the receding phase, it becomes an index related to damage of the refractory near the supply section, and is important measurement information.

  As shown in FIG. 4, the non-contact sensor Hs is provided at one peripheral portion of the furnace ceiling 2 having a circular shape in plan view, and the temperature sensors Ts are equally provided at eight locations in the circumferential direction. Each time the outer cylinder 6 makes one rotation, the melted surface height h at the same location is measured by the non-contact sensor Hs. For example, when the outer cylinder 6 and the furnace bottom 3 rotate once per hour, the respective melting surface heights h can be grasped in a one-hour cycle. The melt surface profile can be estimated based on the melt surface height h and the temperature detected by the temperature sensor Ts.

  In FIG. 4, the temperature sensor Ts is provided at eight locations, but the profile can be estimated if one temperature sensor Ts is provided at least at one location. In other words, even if any of the temperature sensors Ts disposed at eight locations fails, the accuracy can be estimated but the profile can be estimated. Further, the non-contact sensor Hs and the temperature sensor Ts are optimally arranged for estimating the profile if they are arranged side by side in the radial direction from the supply unit to the outlet.

  The workpiece supply control unit 40 estimates the profile of the molten surface of the workpiece based on the outputs of the plurality of sensors Hs and Ts, and based on the estimation result, at least the workpiece supplied to the furnace chamber by the cutting blade 8. Control is performed so that the supply amount of the processed product becomes the target supply amount.

  For example, if it is determined that the molten surface is in a receding phase, the supply amount of the workpiece is adjusted to increase so that the target supply amount is determined so as to obtain an appropriate molten surface profile. If it is determined that the vehicle is in the forward phase, the supply amount of the object to be processed is adjusted so as to be reduced so that the target supply amount is determined so as to obtain an appropriate melting surface profile.

  FIG. 6 shows table information for controlling the rotational speed of the outer cylinder 6 based on the outputs of the sensors Hs and Ts and adjusting the supply amount of the workpiece into the furnace. The workpiece supply control unit 40 controls the drive mechanism 13 based on the table data and the outputs of the sensors Hs and Ts.

  For example, when the melt surface level rises and the lower temperature of the inner cylinder 5 decreases, the melt surface profile is judged to be a forward phase, and the supply amount of the workpiece is lowered. Further, when the melt surface level is lowered and the lower temperature of the inner cylinder 5 is increased, the melt surface profile is judged to be in the receding phase, and the supply amount of the workpiece is increased. The target supply amount at this time is set in advance for each area of the table data as a reference supply amount. In addition, it is preferable that the reference supply amount set in the table data is configured to be sequentially corrected based on data obtained in the forward or backward phase of the melt surface during operation.

  Furthermore, the workpiece supply control unit 40 is configured to correct the target supply amount so that the cumulative supply amount of the workpiece for a predetermined period becomes the target cumulative supply amount. For example, the actual processing amount may be less than the target processing amount of the object to be processed based on the measurement information of the object supply amount obtained while the melt surface profile is maintained in an appropriate state by the above-described control. If the actual processing amount is larger than the target processing amount of the workpiece, the target supply amount is corrected to decrease.

  If the actual processing amount is smaller than the target processing amount of the object to be processed, the heating amount by the combustion burner 10 can be increased, or the processing amount can be increased by increasing the combustion air. If the actual processing amount is larger than the target processing amount of the workpiece, the heating amount by the combustion burner 10 can be reduced, or the processing amount can be reduced by reducing the combustion air.

  By controlling in this way, the target supply amount is corrected so that the cumulative supply amount of the object to be processed in the predetermined period becomes the target cumulative supply amount, so that the target processing amount of the surface melting furnace in the predetermined period can be achieved. Become.

  In other words, the profile of the molten surface can be appropriately estimated based on information obtained by measuring different measurement locations by the plurality of sensors Hs and Ts, and whether or not the molten surface is in an appropriate state is appropriate. Will be able to judge.

  That is, the method for operating the surface melting furnace according to the present invention estimates the profile of the molten surface of the workpiece based on the outputs of the plurality of sensors Hs and Ts installed in the surface melting furnace 1, and uses the estimated profile as the estimated profile. Based on this, at least the supply amount of the treatment object supplied to the furnace chamber 4 by the treatment object supply mechanism 8 is controlled to correct the profile and control the target supply amount. Further, the target supply amount is corrected so that the cumulative supply amount of the object to be processed in the predetermined period is the target cumulative supply amount, that is, the processing amount in the predetermined period achieves the target.

  As shown in FIG. 7, a plurality of non-contact sensors Hs are configured, and at different positions along the path from the supply part to the furnace chamber 4 of the object to be processed by the object supply mechanism 8 to the outlet 3a. Preferably, a plurality of points on the melting surface measured along the path from the supply unit to the outlet 3a are directly measured. An accurate profile can be estimated, and it is possible to appropriately grasp whether the melting surface is moving forward or backward.

  FIG. 8 shows an example in which a plurality of non-contact sensors Hs are arranged at different positions along the circumferential direction of the furnace ceiling 2 and the radial positions of the non-contact sensors Hs are different from each other. If comprised in this way, it can grasp | ascertain how much the molten surface height measured on the radial direction outer side at a certain time changes to the sprue port 3a after that until the molten surface makes one rotation. It becomes like this.

  FIG. 9 shows an example in which a plurality of temperature sensors Ts are installed. A first temperature sensor Tsa disposed on the workpiece storage section 7 side and a second temperature sensor Tsb disposed on the furnace chamber 4 side in the lower part of the inner cylinder 5 are provided. By providing the second temperature sensors Tsa and Tsb, it is possible to compensate for the dead zone due to the first temperature sensor Tsa when the molten surface profile shifts to the forward side. Also in this case, as in FIG. 4, a plurality of sets are installed at a predetermined interval in the circumferential direction.

  Furthermore, by installing the third temperature sensor Tsc and the fourth temperature sensor Tsd in the refractory that constitutes the furnace bottom 3, and measuring the temperature distribution in the radial direction from the tap outlet 3a, You may comprise so that the state of a fusion | melting surface may be grasped | ascertained. At this time, a plurality of temperature sensors may be installed in the radial direction, and a plurality of sets may be installed at predetermined intervals in the circumferential direction.

  By installing a plurality of temperature sensors in the radial direction, the profile of the molten surface can be determined even if the non-contact sensor fails or is not installed, although the accuracy is lowered. Note that the combination of temperature sensor and non-contact sensor is a combination of different types of sensors, so there is a low possibility that a failure will occur at the same time even under the same conditions. This is a better combination that can estimate the profile.

  FIG. 10 shows still another aspect of the non-contact sensor Hs. The measurement light emitted from the light source L is rotationally scanned by the first mirror M1, and is further reflected by the plurality of second reflection mirrors M2 disposed on the periphery of the furnace ceiling toward the melting surface. By providing the light source L with a light receiving element that detects reflected light, the distance from the light source to the melting surface can be measured. Since the distance with respect to the furnace bottom 3 is measured in advance, the melt surface height can be obtained from the difference between them.

  According to the above-described configuration, the melted surface heights at a plurality of locations can be measured with the single light source L and the light receiving element. Furthermore, if the third reflecting mirror M3 having different radial distances is configured to be able to move out and out of the optical path, it is possible to measure a plurality of melting surface heights in different regions along the radial direction.

  Although FIG. 10 shows a configuration applied to an optical sensor, a similar configuration can also be applied to a microwave distance sensor. A plurality of waveguides that propagate electromagnetic waves are arranged radially around the center point, and a metal reflector corresponding to the first mirror is rotated at the center point to propagate through each waveguide, and further to the second mirror You may comprise so that electromagnetic waves may be irradiated to a fusion | melting surface with a corresponding metal reflecting plate. In place of the waveguide, a coaxial cable may be connected to a plurality of trumpet-shaped antennas, and the path of the coaxial cable may be switched by a switch.

  In the above-described embodiment, the configuration in which the workpiece supply mechanism has the cutting blade 8 has been described. However, when the workpiece has fluidity, the processing is performed by the rotation of the outer cylinder 6 even if the cutting blade 8 is not provided. The object supply mechanism can be configured by the outer cylinder 6 and the drive mechanism 13 that rotates the outer cylinder 6.

  In the above-described embodiment, the case where the surface melting furnace is the rotary surface melting furnace 1 has been described as an example. However, the surface melting furnace according to the present invention is not limited to the rotary surface melting furnace 1, but other types. Needless to say, the present invention can also be applied to other surface melting furnaces.

  For example, as shown in FIG. 11 (a), a surface in which a tap outlet 3 a is formed at the center of the furnace bottom 3, and a plurality of pushing-in mechanisms 30 for charging a workpiece are arranged around the furnace bottom 2. It is also possible to apply to the melting furnace 1. In the surface melting furnace, both the outer cylinder 6 configured integrally with the furnace bottom portion 3 and the inner cylinder 5 configured integrally with the furnace ceiling 2 are fixed, and an object to be processed is placed in the furnace chamber by the push-in mechanism 30. Supplied type.

  Further, as shown in FIG. 11 (b), a surface melting furnace 1 in which a tap outlet 3a is formed at the end of the furnace bottom 3, and a plurality of pushing-in mechanisms 30 for injecting workpieces are arranged on the opposite side. It is also possible to apply to. In either example, the workpiece supply mechanism is the push-in mechanism 30.

  That is, the present invention may be a surface melting furnace provided with a plurality of sensors that measure different measurement locations in order to estimate the melting surface profile of the workpiece.

  Each embodiment mentioned above is only an example of the present invention, and the concrete composition of each part can be changed and designed suitably in the range where the operation effect of the present invention is produced.

1: Surface melting furnace 2: Furnace ceiling 3: Furnace bottom 3a: Outlet port 4: Furnace chamber 5: Inner cylinder 6: Outer cylinder 8: Object supply mechanism 40: Object supply controller Hs: Non-contact sensor Ts: Temperature sensor

Claims (5)

A furnace chamber in which a spout is formed; and a workpiece supply mechanism for supplying the workpiece to the furnace chamber; and the workpiece supplied to the furnace chamber by the workpiece supply mechanism A surface melting furnace configured to melt from the surface and flow down to the tap outlet,
To estimate the melt surface profile of the workpiece ,
A temperature sensor for determining whether the melted surface of the workpiece is in the backward phase or the forward phase based on the temperature of the upper part of the supply to the furnace chamber of the workpiece by the workpiece supply mechanism;
A contact sensor that measures the surface height of the object to be processed on the outlet side from the temperature sensor;
A surface melting furnace. Based on the profile of the melt surface of the workpiece estimated based on the outputs of the temperature sensor and the contact sensor, at least the supply amount of the workpiece supplied to the furnace chamber by the workpiece supply mechanism is controlled. surface melting furnace of claim 1, wherein is provided an object to be processed supply control unit. Based on the profile of the melt surface of the workpiece estimated based on the outputs of the temperature sensor and the contact sensor, at least the supply amount of the workpiece supplied to the furnace chamber by the workpiece supply mechanism is a target supply. controls such that the amount of the accumulated supply amount according to claim 1, wherein is provided an object to be processed supply control unit for correcting the target supply quantity so that the target cumulative supply quantity of the object for a predetermined period Surface melting furnace.   An inner cylinder integrally formed around the furnace ceiling and an outer cylinder integrally formed around the furnace bottom portion are arranged concentrically, and the workpiece storage portion is disposed in a gap between the inner cylinder and the outer cylinder. 4. The surface according to claim 1, wherein the workpiece supply mechanism is configured to supply the workpiece to the furnace chamber by relative rotation between the inner cylinder and the outer cylinder. Melting furnace. A furnace chamber in which a spout is formed; and a workpiece supply mechanism for supplying the workpiece to the furnace chamber; and the workpiece supplied to the furnace chamber by the workpiece supply mechanism A method of operating a surface melting furnace configured to melt from the surface and flow down to the tap outlet,
A temperature sensor for determining whether the melted surface of the workpiece is in the backward phase or the forward phase based on the temperature of the upper part of the supply to the furnace chamber of the workpiece by the workpiece supply mechanism; Estimating the profile of the molten surface of the workpiece based on the output of the contact sensor that measures the surface height of the workpiece on the outlet side from the temperature sensor , and supplying at least the workpiece based on the estimation result The target supply amount is controlled so that the supply amount of the workpiece supplied to the furnace chamber by the mechanism becomes the target supply amount, and the cumulative supply amount of the workpiece for a predetermined period becomes the target cumulative supply amount. Method of surface melting furnace to correct

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