WO2015147091A1

WO2015147091A1 - Surface melting furnace and method for operating surface melting furnace

Info

Publication number: WO2015147091A1
Application number: PCT/JP2015/059218
Authority: WO
Inventors: 上林　史朗; 吉岡　洋仁; 史樹寳正; 正治岡田; 健一郎篠原
Original assignee: 株式会社クボタ
Priority date: 2014-03-26
Filing date: 2015-03-25
Publication date: 2015-10-01
Also published as: JP2015187513A; EP3124863A1; JP6305803B2; EP3124863B1; EP3124863A4

Abstract

A surface melting furnace equipped with: a furnace chamber (4) in which a slag hole (3a) is formed in the furnace bottom (3); and a processed material supply mechanism (8) that supplies a material being processed to the furnace chamber (4). The surface melting furnace is configured such that material being processed, which is supplied to the furnace chamber (4) by the processed material supply mechanism (8), melts from the surface and flows down to the slag hole (3a). In addition, the surface melting furnace is equipped with multiple sensors (Hs, Ts) which perform measurements at different measurement locations in order to estimate a profile for the molten surface of the material being processed, thereby enabling the profile of the molten surface to be estimated over a wide range.

Description

Surface melting furnace and method of operating surface melting furnace

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 the workpiece to the furnace chamber, and the workpiece to be processed supplied to the furnace chamber by the workpiece supply mechanism The object is configured to melt from the surface and flow down to the tap.

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 it is judged whether the supply is insufficient or excessive from the ratio of the amount of slag to the amount of workpiece to be processed in a certain period of time from several hours to half a day. The supply amount and the melting conditions are adjusted so that the supply amount of the object to be processed becomes 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-mentioned judgment 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, in order to prevent unmelted workpieces from being discharged from the outlet, the melting furnace has a sufficient margin so that the target throughput can be melted in a supply shortage state rather than an excessive supply state. 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 with a wavelength is irradiated onto the melt 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 melt surface, and the position of the melt surface is determined based on the position detection result. A melting surface control method for determining whether or not the material is suitable is disclosed.

When the melt surface control method determines that the position of the melt surface has advanced from the appropriate position, the supply amount per unit time to the melt processing area of the workpiece is reduced, and conversely, the position is When it is determined that the object is moving backward, the supply amount per unit time of the object to be melted is increased.

JP 11-325434 A

However, 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. For this reason, a large number of units cannot be installed, and it has been difficult to estimate the profile of the melting surface over a wide range.

An object of the present invention is to provide a surface melting furnace and a method for operating a surface melting furnace capable of estimating a wide range of melting surface profiles in view of the above-described problems.

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. The surface melting furnace is provided with a plurality of sensors for measuring different measurement points in order to estimate the melting surface profile of the workpiece.

According to the above configuration, the profile of the molten surface can be estimated appropriately based on information obtained by measuring different measurement points with a plurality of sensors. This makes it possible to properly determine whether or not the molten surface is in an appropriate state.

In the second characteristic configuration, as described in claim 2, in addition to the first characteristic configuration described above, one of the sensors is configured so that an object to be processed by the object supply mechanism is supplied to the furnace chamber. It is in the point comprised with the temperature sensor which detects the temperature of a supply part.

If the molten surface of the workpiece is retreated, it becomes susceptible to the furnace chamber temperature and the temperature of the supply section rises. When the molten surface of the workpiece advances, it becomes difficult to be affected by the furnace chamber temperature, and the temperature of the supply section decreases. 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.

In the third feature configuration, as described in claim 3, in addition to the first or second feature configuration described above, the plurality of sensors may be configured such that the furnace of the workpiece by the workpiece supply mechanism is provided. It exists in the point arrange | positioned in a different position along the path | route from the supply part to a chamber to the said spout.

According to the above-described configuration, a plurality of melt surfaces measured along the path from the supply unit to the tap outlet are measured. Based on this measurement information, the profile of the molten surface from the supply unit to the outlet can be estimated, and it is possible to appropriately grasp whether the molten surface is moving forward or backward.

In the fourth feature configuration, as described in claim 4, in addition to any of the first to third feature configurations described above, one of the sensors detects the surface height of the workpiece. It is in the point comprised with a non-contact sensor.

The surface height of the object to be processed is detected by a non-contact sensor, and at least one point of the melt surface can be directly measured.

As described in the fifth aspect, in addition to any of the first to fourth characteristic configurations described above, the fifth characteristic configuration is based on the output of the plurality of sensors. A profile supply is provided, and a workpiece supply control unit that controls at least the supply amount of the workpiece supplied to the furnace chamber by the workpiece supply mechanism based on the estimated profile is provided.

The workpiece supply control unit estimates the profile of the molten surface of the workpiece, and determines whether the molten surface is in a backward phase or a forward phase. When it is determined that the molten surface is in the receding phase, the supply amount of the object to be processed is adjusted so as to increase toward the target supply amount determined so as to obtain an appropriate molten surface profile. When it is determined that the molten surface is in the forward phase, the supply amount of the object to be processed is adjusted so as to decrease toward the target supply amount determined so as to obtain an appropriate molten surface profile.

In the sixth feature configuration, as described in claim 6, in addition to any one of the first to fourth feature configurations described above, based on outputs of the plurality of sensors, The profile is estimated, and based on the estimation result, control is performed so that the supply amount of the treatment object supplied to the furnace chamber by at least the treatment object supply mechanism becomes the target supply amount, and the treatment object for a predetermined period In other words, the apparatus includes a workpiece supply control unit that corrects the target supply amount so that the cumulative supply amount becomes the target cumulative supply amount.

In the fifth 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 sixth 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 addition to any one of the first to sixth feature configurations described above, the seventh feature configuration includes an inner tube integrally formed around the furnace ceiling and the furnace bottom portion as described in claim 7 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 a plurality of sensors are provided, a plurality of measurement data along the circumferential direction can be obtained by at least one sensor during one rotation of the melting furnace. The three-dimensional melt surface profile can be estimated from the plurality of measurement data, and the melt surface profile can be estimated more accurately.

The characteristic configuration of the operation method of the surface melting furnace according to the present invention includes a furnace chamber in which a spout is formed, and a workpiece supply for supplying the workpiece to the furnace chamber as described in claim 8 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. Estimating the profile of the molten surface of the workpiece based on the outputs of a plurality of sensors installed in the surface melting furnace, and based on the estimation result, at least the workpiece supplied to the furnace chamber by the workpiece supply mechanism. The control is performed so that the supply amount of the processed material becomes the target supply amount, and the target supply amount is corrected so that the cumulative supply amount of the processing object during the predetermined period becomes the target cumulative supply amount.

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.

FIG. 1 is an explanatory view of a rotary surface melting furnace according to the present invention. FIG. 2 is an explanatory view of a rotary surface melting furnace showing a state in which the melting surface is retracted. FIG. 3 is an explanatory diagram of a rotary surface melting furnace showing a state in which the melting surface has advanced. FIG. 4 is an explanatory diagram showing the arrangement of sensors. FIG. 5 is an explanatory diagram of a plurality of sensors that measure the melt surface height. FIG. 6 is an explanatory diagram of a control table based on a plurality of sensors. FIG. 7 shows another embodiment and is an explanatory diagram of a plurality of sensors for measuring the melt surface height. FIG. 8 shows another embodiment, and is an explanatory diagram of a plurality of sensors that measure the melt surface height. FIG. 9 shows another embodiment, and is an explanatory diagram of a plurality of sensors that measure the melt surface height. FIG. 10 shows another embodiment, and is an explanatory diagram of a plurality of sensors that measure the melt surface height. 11 (a) and 11 (b) are explanatory views of a main part of a surface melting furnace showing 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. The surface melting furnace 1 includes a furnace chamber 4 in which two combustion burners 10 each having an air supply mechanism 11 are installed at a substantially central part of the furnace ceiling 2 and an outlet 3a is formed in the furnace bottom part 3; A workpiece storage unit 7 provided around the chamber 4 and a workpiece supply mechanism 8 for supplying the workpiece from the workpiece storage unit 7 to the furnace chamber 4 are provided.

In addition, an inner cylinder 5 formed integrally with the furnace ceiling 2 around the furnace ceiling 2 and an outer cylinder 6 formed integrally with the furnace bottom 3 around the furnace bottom 3 are arranged concentrically. The space formed between the outer cylinder 6 and the outer cylinder 6 is configured to be the workpiece storage portion 7.

The connection part with the drive mechanism 13 is provided in the lower part of the outer cylinder 6, and when the outer cylinder 6 rotates by the drive mechanism 13, the inner cylinder 5 and the outer cylinder 6 are comprised so that it may rotate relatively. A plurality of cutting blades 8 that are components of the workpiece supply mechanism are provided in the lower portion of the inner cylinder 5 along the circumferential direction.

The cutting blade 8 is composed of a plate-like inclined blade that guides to the furnace chamber 4 an object to be processed that moves in a tangential direction below the inner cylinder 5 by the rotation of the outer cylinder 6. By the relative rotation of the cutting blade 8, the inner cylinder 5 and the outer cylinder 6, the object to be processed accommodated in the object to be processed container 7 is supplied to the furnace chamber 4 in an annular shape, and the object to be processed is mortar-shaped in the furnace chamber. It becomes.

A boundary portion between the edge of the cover body 5 a 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. A hopper 15 having a double damper mechanism 15 a is disposed on the upper part of the cover body 5 a, and the object to be processed is thrown 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 processed is melted is disposed below the tap outlet 3a. Immediately below the outlet 3a, a flue extends in the horizontal direction, and along the flue, a secondary combustion device, a waste heat boiler, an air preheater, a temperature reducing tower, a bag filter, a smoke washing device, white An exhaust gas treatment facility such as a smoke prevention device is 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 treated objects.

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

When the melting surface profile is retracted from the outlet 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 is provided with 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. Based on the information obtained by measuring different measurement points with the plurality of sensors Ts and Hs, the profile of the molten surface is estimated. This profile includes a workpiece supply control unit 40 that appropriately determines whether or not the molten surface is in an appropriate state, and adjusts the amount of workpiece to be charged into the furnace. 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 is composed of a non-contact sensor Hs that detects the surface height of the workpiece through the furnace ceiling 2 that covers the furnace chamber 4. The melting surface height h is detected by the non-contact sensor Hs so as to face the workpiece from the furnace ceiling 2, and at least one point of the melting surface can be directly measured. 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 an 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. Since the thermal decomposition of the object to be processed is promoted at the temperature in the furnace, and the volume of the object to be processed fluctuates significantly, 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. Further, the degree of forward and reverse phases is grasped by the magnitude of the difference value between the melt surface height h at that time and the melt surface height h2 corresponding to the reference melt surface profile.

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 melt surface of the workpiece is retreated, the temperature of the supply unit rises due to the influence of the furnace chamber temperature. As shown in FIG. 3, when the melting surface of the workpiece advances, it becomes difficult to be affected by the furnace chamber temperature, and the temperature of the supply section decreases. Therefore, it is difficult for the melt surface of the workpiece to detect the forward phase, but the backward phase can be accurately detected by the temperature increase of the temperature sensor Ts. 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 circular ceiling 2 in a 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 sensors Ts are 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. Based on the estimation result, control is performed so that the supply amount of the workpiece to be supplied to the furnace chamber by at least the cutting blade 8 becomes the target supply amount.

For example, when it is determined that the molten surface is in a backward phase, the supply amount of the workpiece is adjusted so as to increase toward the target supply amount determined so as to obtain an appropriate molten surface profile. When it is determined that the molten surface is in the forward phase, the supply amount of the object to be processed is adjusted so as to decrease toward the target supply amount determined so as to obtain an appropriate molten 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 inner cylinder 5 lower temperature falls, the melt surface profile is judged to be in 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.

That is, the profile of the molten surface can be estimated based on information obtained by measuring different measurement locations by the plurality of sensors Hs and Ts. Whether or not the molten surface is in an appropriate state can be properly determined from the profile of the molten surface.

That is, the surface melting furnace operating method according to the present invention estimates the melting surface profile of the workpiece based on the outputs of the plurality of sensors Hs and Ts installed in the surface melting furnace 1. Based on the estimated profile, the supply amount of the object to be supplied to the furnace chamber 4 by at least the 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. It is preferable that they are arranged. Since a plurality of points on the melting surface are directly measured along the path from the supply unit to the spout 3a, an accurate profile of the melting surface from the supply unit to the spout can be estimated, and the melting surface advances. You will be able to properly grasp whether you are moving or retreating.

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 are arranged so that the radial positions of the respective non-contact sensors Hs are different. 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.

複数 By installing a plurality of temperature sensors in the radial direction, the profile of the molten surface can be determined although the accuracy is lowered even when the non-contact sensor is broken or not installed. 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 embodiment 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, it is possible to measure the melt surface height at a plurality of locations with a single light source L and a 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.

FIG. 10 shows a configuration applied to an optical sensor, but 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 for measuring different measurement points in order to estimate the profile of the melting surface of the workpiece.

Each embodiment described above is merely an example of the present invention, and the specific configuration of each part can be appropriately changed and designed within the range where the effects of the present invention are exhibited.

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

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,
A surface melting furnace comprising a plurality of sensors for measuring different measurement points in order to estimate a melting surface profile of a workpiece.
The surface melting furnace according to claim 1, wherein one of the sensors comprises a temperature sensor that detects a temperature of a supply portion of the workpiece to be supplied to the furnace chamber by the workpiece supply mechanism.
The said some sensor is arrange | positioned in a different position along the path | route from the supply part to the said furnace chamber of the to-be-processed object by the said to-be-processed object supply mechanism to the said spout. Surface melting furnace.
The surface melting furnace according to any one of claims 1 to 3, wherein one of the sensors is a non-contact sensor that detects a surface height of an object to be processed.
Based on the outputs of the plurality of sensors, the profile of the molten surface of the workpiece is estimated, and based on the estimated profile, at least the supply amount of the workpiece to be supplied to the furnace chamber by the workpiece supply mechanism The surface melting furnace in any one of Claim 1 to 4 provided with the to-be-processed object supply control part to control.
A profile of the melting surface of the workpiece is estimated based on the outputs of the plurality of sensors, and a supply amount of the workpiece supplied to the furnace chamber by at least the workpiece supply mechanism based on the estimation result is a target. 2. A processing object supply control unit that controls the supply amount so as to correct the target supply amount so that the cumulative supply amount of the object to be processed in a predetermined period becomes the target cumulative supply amount. 4. The surface melting furnace according to any one of 4 above.
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. The surface according to any one of claims 1 to 6, wherein the workpiece supply mechanism is configured to supply the workpiece to the furnace chamber by relative rotation of 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,
Based on the output of a plurality of sensors installed in the surface melting furnace, the profile of the melting surface of the workpiece is estimated, and based on the estimation result, the workpiece to be processed is supplied to the furnace chamber by at least the workpiece supply mechanism A method for operating a surface melting furnace, wherein control is performed so that a supply amount of a product becomes a target supply amount, and the target supply amount is corrected so that a cumulative supply amount of an object to be processed for a predetermined period becomes a target cumulative supply amount.