JP2006233408A - Fiber production plant based on coal ash melting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plant for producing uniform fly ash fiber from coal ash using no electricity as energy with no need of the pretreatment of removing unburnt carbon fractions. <P>SOLUTION: The plant has the following construction: There is equipped a melting furnace of such a structure as to melt coal ash using coal as fuel and allow the resulting molten slag to fall via a slag tap. A slag pond is provided under the slag tap and furnished with a slag outlet, which is so structured as to form a molten slag pool, and there is provided a molten slag discharge means functioning to make molten slag overflow at a position higher than the slag outlet. Further, there is equipped a fiber-forming machine functioning to spray falling molten slag with air to effect fiber formation. With this plant, a given amount of molten slag can be discharged via the slag outlet, and by keeping the air jet level via an air nozzle constant, the objective uniform fly ash fiber can be produced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coal ash melt fiberizing apparatus that melts and fiberizes coal ash.

  Coal ash discharged from coal-fired boilers is reused for soil improvement materials, cement raw materials, etc., but most are disposed of in landfills. In recent years, elution of harmful substances contained in a small amount of coal ash and depletion of landfill sites have become problems, and it has been studied to melt coal ash into slag. By making slag, it is possible to prevent elution of harmful substances and to reduce the volume. The reuse of slag is also under consideration. Granulated slag produced by melting coal ash and quenching molten slag with water has already been reused as cement aggregate and asphalt roadbed material.

  Recently, coal ash is being melted and made into a fiber, so that it can be effectively used as an alternative to rock wool, glass fiber, and ceramic fiber. Hereinafter, what was manufactured by melting and fiberizing coal ash is referred to as fly ash fiber. As a method for producing fly ash fiber, a batch type electric furnace method is known (see, for example, Patent Document 1). Since the electric furnace method can increase the temperature up to 2000 ° C., it can be used for many types of coal ash and is excellent in that it can produce high-quality fly ash fiber. However, coal ash contains 5% or less of unburned carbon, and there is a problem that carbon monoxide gas is generated from the inside of the electric furnace, thereby inhibiting current conduction. In order to prevent this, a firing step for removing unburned carbon in advance is required. In the electric furnace method, expensive electricity is used as energy, and further, a pretreatment firing step is required, so that the manufacturing cost of fly ash fiber is high.

JP 2004-137625 A (summary)

  The object of the present invention is to melt coal ash using energy cheaper than electricity, eliminate the need for a pretreatment step of removing unburned carbon contained in the coal ash, and produce a homogeneous fly ash fiber. An object of the present invention is to provide a coal ash melt fiberizing apparatus.

  The present invention relates to a coal ash melting and fiberizing apparatus for melting and fiberizing coal ash, melting the coal ash using coal as fuel and dropping the molten slag from the lower slag tap, and discharging from the slag tap A slag pond that stores the molten slag, a spout from which the molten slag is discharged from the slag pond, and a fiber that blows air to the molten slag that flows out from the spout and falls to cause the molten slag to scatter And a melting slag taping means for overflowing the molten slag at a position higher than the tapping port.

  In the present invention, a coal combustion type melting furnace using coal, which is cheaper than electricity, as a fuel is employed as a furnace for melting coal ash. In the coal combustion type melting furnace, coal ash can be directly charged into the melting furnace, and unburned carbon in the coal ash can be removed. For this reason, the pre-processing process for baking coal ash beforehand can be made unnecessary, and it is possible to reduce the manufacturing cost of a fly ash fiber compared with an electric furnace method.

  In addition, the coal ash melt fiberizing apparatus of the present invention can maintain a constant discharge amount of molten slag by forming a molten slag pool at the outlet, and therefore, keep the air discharge amount constant. A homogeneous fly ash fiber can be produced.

  In the present invention, the molten slag taping means is provided with a hook having an outlet that overflows the molten slag separately from a bottle provided with an outlet that flows out and drops the molten slag for fiberization. Can be realized. Moreover, it can implement | achieve by providing a sprue opening in the spear provided with the sprue opening which flows out and drops molten slag for fiberization.

  It is preferable that the spout for discharging and dropping the molten slag for fiberizing has a hole diameter of φ10 mm to φ20 mm, and the periphery of the spout is preferably 50 mm or less. Thereby, stable slag discharge can be realized.

  Below the molten slag reservoir, there is provided a tank that receives the molten slag that has flowed out from the spout and dropped without being fiberized by the fiberizer and the molten slag that has flowed out by the molten slag unloading means. It is desirable to collect as slag. Further, it is desirable to provide a heating burner to heat the molten slag in the molten slag pool, particularly the molten slag present at the fiberizing side and the fiberizing side outlet. Furthermore, it is desirable to provide a temperature measuring device near the outlet where the molten slag for fiberizing flows out and drops, and to control the load of the heating burner based on the measured temperature value.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic view showing a configuration of a coal ash melt fiberizing apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view of the vicinity of the melting furnace and the slag pond. As the melting furnace for melting coal ash, a coke bed, a thermal decomposition direct melting furnace, and a surface combustion and swirl melting fuel combustion melting furnace are possible. In this embodiment, a swirl type melting furnace which is a kind of fuel combustion type melting furnace is used.

  The swirl type melting furnace 1 is provided with an air nozzle 2, an ash nozzle 3 and a coal nozzle 4 on the side wall of the furnace body, and uses coal as a fuel to form a high-temperature field at the top of the slag tap 5 at the bottom of the furnace by swirling flow. And melt the ash. Exhaust gas from coal combustion is discharged from the top of the furnace body.

  Coal ash contains 5% or less of unburned carbon, but since this unburned carbon burns in the swirl type melting furnace 1, the pretreatment for burning the coal ash in advance and removing the unburned carbon is performed. Not necessary. Moreover, since cheap coal is used as the energy of the melting furnace body, the manufacturing cost of the fly ash fiber to be manufactured can be reduced.

  An in-furnace temperature measuring device 7 is installed in the high temperature field, and the amount of coal in the coal nozzle 4 is controlled via the melting furnace control device 8 from the measured value of the in-furnace temperature. The high-temperature field needs to be maintained at a temperature equal to or higher than the melting point of ash. If the temperature is lower than that, the amount of coal is increased to increase the temperature. After the temperature measurement value of the in-furnace temperature measuring device 7 reaches or exceeds the melting point of the ash to be melted, the ash is supplied from the ash nozzle 3. When the ash is supplied, the temperature of the in-furnace temperature measuring device 7 is lowered. Therefore, when the measured value is lowered below the melting point of the ash, the amount of coal supplied from the coal nozzle 4 is increased.

  The slag melted in the swirl type melting furnace 1 flows down from the slag tap 5 and stays in the slag pond 6. The molten slag 10 flows separately into a ridge 15 that induces molten slag for fiberization and a ridge 25 that induces molten slag to overflow.

  The flange 15 has a structure in which the tip portion is closed, and a hole for discharging the molten slag, that is, an outlet 16 is provided at the bottom of the flange 15. Since the outlet 16 is provided at a position lower than the outlet 26 provided in the overflow side hook 25, the molten slag flowing down from the slag tap 5 to the slag pond 6 It flows down preferentially to the outlet 16 on the fiberizing side. It is preferable that the spout 16 has a structure that is easily filled with molten slag by reducing the space by reducing the hole diameter or the like. When the amount of molten slag is large, the molten slag overflowing from the slag pond 6 flows through the dredger 25 and is discharged from the outlet 26. It is desirable that the overflow outlet 26 has a structure in which the space is increased and the molten slag is not easily filled. By adopting the overflow method, the thickness of the slag reservoir formed at the top of the taphole 16 can be kept constant, and the discharge amount of the molten slag at the tapport 16 can be kept constant.

  The molten slag flowing down from the outlet 26 of the overflow side dredger 25 falls into the water tank 41 through the slag discharge tube 24 and is recovered as a granulated slag. On the other hand, the molten slag flowing down from the outlet 16 on the fiberizing side does not eject air from the air nozzle 12 because the temperature of the molten slag does not reach the temperature required for fiberization at the initial stage of startup. It is dropped into the water tank 41 through the discharge cylinder 14, is rapidly cooled in the water tank 41, and is recovered as a granulated slag.

  The temperature of the molten slag required for fiberization is generally higher than the temperature of the molten slag flowing down from the slag tap 5 and the outlet 26 on the overflow side. In order to raise the molten slag to a temperature necessary for fiberization, the molten slag of the slag pond 6 is heated by the heating burner 11, in particular, the molten slag staying at the fiber-side tub 15 and the fiberizing-side outlet 16. Heat. The temperature measuring device 17 measures or evaluates the temperature of the molten slag on the fiberizing side. A temperature measuring device may be embedded in the refractory material to indirectly estimate the temperature of the molten slag. Further, the temperature measuring device 17 in the present embodiment may measure the ambient temperature in the vicinity of the tap. The ambient temperature is sensitive to the load change of the heating burner 11, and the load control of the heating burner can be performed quickly. The load of the heating burner 11 is controlled via the heating burner control device 18 from the temperature information of the atmosphere near the molten slag or the tap. If the temperature of the molten slag staying at the eaves 15 and the outlet 16 is equal to or lower than the molten slag temperature range suitable for fiberization, the load of the heating burner 11 is increased and the molten slag temperature is raised. On the other hand, if it is higher than the melting slag temperature range necessary for fiberization, the load of the heating burner 11 is gradually lowered to the melting slag temperature range necessary for fiberization.

  After reaching the melting slag temperature necessary for fiberization, high-speed air is ejected from the air nozzle 12, and the molten slag is scattered as fine droplets to be fiberized. The liquid droplets are solidified in the form of fibers and are collected by the fiber collection device 13. In this example, the fiberizer was composed of an air nozzle 12 and a fiber recovery device 13. A homogeneous fly ash fiber can be produced by keeping the amount of molten slag discharged from the spout 16 on the fiberizing side and the amount of air blown from the air nozzle 12 constant.

  When the fiberizing operation is not performed, the ejection of air from the air nozzle 12 is stopped, and the molten slag is dropped into the water tank 41 through the slag discharge cylinder 14 and recovered as a granulated slag. It is also possible to provide a plurality of tap holes 16 for mass production.

  According to this example, it was possible to produce a homogeneous fly ash fiber without performing a pretreatment process for removing unburned carbon necessary for the use of electricity as energy. In addition, coal ash can be continuously melted and fiberized.

  An embodiment in which the structure in the vicinity of the spout 15 of the gutter 15 is changed will be described with reference to (a), (b) and (c) of FIG.

  FIG. 3A is a plan view showing a structure in the vicinity of the taphole 16. (B) is AA sectional drawing of (a), (c) is BB sectional drawing of (a). In this embodiment, a hole structure is used in order to reduce the space of the spout 16. Moreover, as shown in (b), the upper part of the taphole 16 was made into the concave structure which has a hollow in order to form a slag reservoir.

  As a result of a melting test at a slag amount of 80 kg / h to 250 kg / h, it was found that massive slag was mixed in the molten slag. This massive slag is one in which the slag adhered to the melting furnace falls off and is carried on the flow of the molten slag, and the size is 30 to 40 mm square.

  As a result of producing and testing a spear with a spout structure with a hole diameter of φ10 mm, φ15 mm, and φ20 mm, massive slag sometimes blocked the spout opening, but the spout was not completely blocked, The molten slag flowed down, and the massive slag gradually melted and disappeared. When the hole diameter was 10 mm, the bottom of the tap was closed with slag after the melting furnace was stopped and cooled, and it was necessary to penetrate the tap at the time of restart. On the other hand, when the hole diameter was φ20 mm, the slag reservoir was not continuously formed at the upper part of the tap opening during the melting operation, and the slag discharge amount fluctuated. When the hole diameter was 15 mm, there was no slag blockage at the bottom of the tap outlet after the melting furnace was stopped and cooled, and a slag reservoir was continuously formed at the top of the tap outlet during the melting operation, and the slag discharge amount was also stable. As described above, it was found that if the amount of coal for heating the melting furnace and the amount of ash to be melted are constant, the slag discharge amount is stabilized by forming a slag reservoir at the top of the tap. The diameter of the tap hole is preferably 10 mm or more and 20 mm or less, and particularly preferably in the range of 13 to 17 mm around 15 mm. When the diameter of the tap hole is larger than the size of the block slag, the block slag passes through the tap port and the block slag is mixed in the manufactured fiber, so that the quality of the fiber is expected to deteriorate.

  Although the upper part of the tap hole 16 is in a high temperature state, the hole bottom part of the tap hole dissipates heat toward the water surface of the water tank 41 that cools the molten slag, and the temperature decreases. When the amount of slag is small, the temperature of the molten slag decreases at the bottom of the tap hole 16 and solidifies and closes. Therefore, as shown in the AA sectional view and the BB sectional view, the thickness of the peripheral portion of the tap outlet is made as thin as possible, and the heat of the molten slag accumulated at the upper portion of the tap outlet 16 A temperature drop at the bottom of the mouth was prevented.

  As a result of manufacturing and testing a melting pot having two tap hole structures with a thickness of 50 mm and 30 mm in the vicinity of the tap hole of the tap hole 16, the melting furnace Depending on the stop state, the hole of the tap 16 may be blocked after stopping and cooling, and it is necessary to work through the tap to restart. On the other hand, when the thickness of the peripheral portion of the taphole was 30 mm, the tapport was not blocked even after the melting furnace was stopped and cooled. From the above, it was found that the thickness of the peripheral portion of the taphole 16 is 50 mm or less at the maximum, and 25 to 35 mm of about 30 mm is particularly preferable.

  In FIG. 1, when the tap port 16 is closed, the slag reservoir at the top of the tap port 16 is at the same height as the tap port 26 of the opposite tap 25, so the melting furnace is stopped and cooled in this state. It will be. In this case, it is necessary to disassemble and replace not only the portion of the outlet 16 but also the portions of the slag pond 6 and the ridges 15 and 25. As shown in FIG. 3, a tip space 19 is provided at the tip of the rod 15, an overflow outlet is provided as shown in the AA cross-sectional view, and the height of the weir is the same as that of the rod 15. Thereby, even when the spout 16 was closed, the molten slag overflowed from the tip space 19 and was able to spout. In this state, when the melting furnace is stopped and cooled, only the structure of the spout 16 need be replaced.

  In FIG. 1, the spear having the spout 16 for fiberization and the spear having the spout 26 for overflow are provided separately, but the spout and the spout for overflow are provided in the same reed. By providing, it is possible to unite the cage structure.

  4 and 5 are schematic configuration diagrams showing another embodiment of the coal melt fiberizing apparatus according to the embodiment of the present invention. FIG. 5 is a view of the apparatus of FIG. 4 as viewed from the direction of the heating burner 11.

  In the present embodiment, a monitoring window 20 is provided at the upper part of the spout 15 of the spout 15, and a slag state monitoring device 21 for monitoring the molten slag state at the top of the spout is provided through the monitoring window 20. For example, a radiation thermometer can be used for the slag state monitoring device 21. The condition for fiberizing the molten slag was determined by the slag viscosity, and as a result of examination by a melt fiberization test, it was 1 Pa · s or less. The higher the temperature, the lower the viscosity, and the viscosity can be evaluated from the slag temperature. The relationship between the slag temperature and the viscosity can be obtained, for example, by a basic test using a high-temperature rotary viscometer.

  In the initial stage where molten slag comes out from the spout 16, the slag temperature is low and the viscosity is high, but the slag temperature gradually increases and reaches a slag viscosity of 1 Pa · s or less. This condition is the first condition for starting the air nozzle 12 and the fiber recovery device 13 which are fiberizers.

  Furthermore, in order to produce a stable fiber, it is necessary to form a slag reservoir. For example, by using a video camera for the slag state monitoring device 21 in the melting test, it is possible to monitor the open / closed state of the hole of the spout 16. Then, by analyzing the image information in the vicinity of the tap hole obtained by the video camera, it is possible to monitor the opening / closing state of the tap hole and monitor the formation of the slag pool. Also, video cameras used for other monitoring devices monitor the slag state by analyzing image information.

  The monitoring window 35 provided in the slag discharge cylinder 14 is a window for monitoring the state in which the slag flows down the slag discharge cylinder 14. For example, a video camera is used as the slag monitoring device 36. If slag flow is confirmed by the slag monitoring device 36, there is no solidification blockage of the hole of the spout 16 and a second condition for starting the air nozzle 12 and the fiber recovery device 13 as the fiberizing device is established.

  After the two conditions for starting the fiberizer are satisfied, the air nozzle 12 and the fiber recovery device 13 can be started by controlling the pumps 33 and 39 by the fiberization control device 34. Here, if the slag flow is not confirmed by the slag monitoring device 36, the molten slag is solidified and blocked at the spout 16, so that the air nozzle 12 and the fiber recovery device 13 are not activated and melted from the tip space 19. Slag is discharged and granulated slag is produced.

  After starting the air nozzle 12 and the fiber recovery device 13 which are fiberizers, the fiber manufacturing state is monitored from the monitoring window 37. For example, a video camera is used for the fiber production monitoring device 38 to monitor whether the fiber production is normal. If there is an abnormality, the air nozzle 12 and the fiber recovery device 13 are stopped by the fiberization control device 34.

  The slag discharge cylinder 14 has a water-sealed structure connected to a water tank 41, and is provided with a pressure measuring device 30 and a gas suction port 29, and the gas suction control device 31 controls the output of the gas suction pump 32 based on the measured pressure value. . When the combustion state of the coal in the swirling furnace 1 and the heating burner 11 is unstable, the pressure in the slag discharge cylinder 14 fluctuates through the slag pond 6, the dredger 15, and the outlet 16. Although the slag discharge cylinder 14 is sealed with the water tank 41, there is a risk of causing combustion gas to leak out of the apparatus together with the water in the water tank 14 when the degree of pressure fluctuation is large. In addition, even when the air nozzle 12 is supplying air but the pump 33 for collecting and sucking the fiber does not operate, the slag discharge cylinder 14 is pressurized, and the gas from the water tank 14 is discharged outside the apparatus together with water. Leak. In order to prevent this, the internal pressure of the slag discharge cylinder 14 may be maintained at a negative pressure. The pressure in the slag discharge cylinder is monitored by the pressure measuring device 30, and the gas suction pump 32 is controlled via the gas suction control device 31. Thereby, the leakage of the combustion gas from the slag discharge cylinder 14 can be prevented.

Schematic which shows the structure of the coal ash melt fiberization apparatus by the Example of this invention. The perspective view which shows the structure of the vicinity of a melting furnace and a slag pond. Schematic which shows the structure of the taphole vicinity. Schematic which shows the other Example of a coal ash melt fiberization apparatus. The schematic diagram which looked at the device of Drawing 4 from the direction of a heating burner.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Swivel-type melting furnace, 2 ... Air nozzle, 3 ... Ash nozzle, 4 ... Coal nozzle, 5 ... Slag tap, 6 ... Slag pond, 7 ... In-furnace temperature measuring device, 8 ... Melting furnace control apparatus, 10 ... Melting Slag, 11 ... heating burner, 12 ... air nozzle, 13 ... fiber recovery device, 14 ... slag discharge tube, 15 ... slag, 16 ... spout, 17 ... temperature measuring device, 18 ... heating burner control device, 19 ... tip Space, 20 ... Monitoring window, 21 ... Slag state monitoring device, 24 ... Slag discharge cylinder, 25 ... Saddle, 26 ... Outlet, 29 ... Gas suction port, 30 ... Pressure measuring device, 31 ... Gas suction control device, 32 DESCRIPTION OF SYMBOLS ... Gas suction pump, 33 ... Pump, 34 ... Fiberization control apparatus, 35 ... Monitoring window, 36 ... Slag monitoring apparatus, 37 ... Monitoring window, 38 ... Fiber production monitoring apparatus, 39 ... Pump, 41 ... Water tank.

Claims (14)

  In a coal ash melting and fiberizing apparatus for melting and fiberizing coal ash, a melting furnace having a structure for melting coal ash using coal as fuel and dropping molten slag from a lower slag tap, and molten slag discharged from the slag tap A slag pond that stores slag, a tapping outlet that discharges molten slag from the slag pond, and a fiberization that blows air to the molten slag that flows out of the tapping outlet and falls to disperse the molten slag into a fiber A coal ash melt fiberizing apparatus comprising: a machine and molten slag taping means for overflowing the molten slag at a position higher than the taphole so that the taphole is filled with molten slag.   In a coal ash melting and fiberizing apparatus for melting and fiberizing coal ash, a melting furnace having a structure for melting coal ash using coal as fuel and dropping molten slag from a lower slag tap, and molten slag discharged from the slag tap A slag pond that stores slag, a slag that guides molten slag from the slag pond, and a fiberizer that blows air to the molten slag that flows out from the outlet of the slag and falls to disperse the molten slag into a fiber And a coal ash melting and fiberizing apparatus, comprising: molten slag taping means for overflowing the molten slag at a position higher than the tapping port so that the tapping port of the soot is filled with molten slag.   3. The coal ash melt fiberizing apparatus according to claim 2, wherein the molten slag taping means is provided with another barb having a barb at a position higher than the barb of the barn.   3. The coal ash melt fiberizing apparatus according to claim 2, further comprising an outlet for overflowing the molten slag at a position higher than the outlet.   3. The coal ash melt fiberization according to claim 2, wherein a portion of the tap opening of the paddle having the tap opening is recessed as compared with the periphery thereof, and a slag pool is formed there. apparatus.   The coal ash melt fiberizing apparatus according to claim 1 or 2, wherein the tap hole has a hole diameter of φ10 mm to φ20 mm.   The coal ash melt fiberizing apparatus according to claim 1 or 2, wherein a thickness around the taphole is 50 mm or less.   The water tank according to claim 1 or 2, further comprising a molten slag that flows out from the tap and falls without being fiberized by the fiberizer, and a water tank that receives the molten slag that flows out by the molten slag taping means. Coal ash melt fiberizing equipment.   In a coal ash melting and fiberizing apparatus for melting and fiberizing coal ash, a melting furnace having a structure for melting coal ash using coal as fuel and dropping molten slag from a lower slag tap, and molten slag discharged from the slag tap A slag pond that stores slag, a slag that guides molten slag from the slag pond, and a fiberizer that blows air to the molten slag that flows out from the outlet of the slag and falls to disperse the molten slag into a fiber And a molten slag taping means for overflowing the molten slag at a position higher than the tapping port so that the tapping port of the paddle is filled with molten slag, and a molten slag accumulated in the vicinity of the tapping port of the paddle A coal ash melt fiberizing apparatus comprising heating means for heating the ash.   10. The heating burner according to claim 9, wherein the heating means is a heating burner for heating the molten slag accumulated in the vicinity of the tap outlet, and a molten slag temperature or an ambient temperature in the vicinity of the tap outlet is measured. A coal ash melt fiberizing device comprising a heating burner control device for controlling a load.   In a coal ash melting and fiberizing apparatus for melting and fiberizing coal ash, a melting furnace having a structure for melting coal ash using coal as fuel and dropping molten slag from a lower slag tap, and molten slag discharged from the slag tap A slag pond that stores slag, a slag that induces molten slag from the slag pond, and a fiberizer that blows air to the molten slag that flows out from the outlet of the slag and falls to disperse the molten slag into a fiber A molten slag taping means for overflowing the molten slag at a position higher than the tapping port so that the tapping port of the paddle is filled with molten slag, and a molten slag existing above the tapping port of the paddle A temperature measuring device for measuring the temperature, and a fiberizer control device for operating the fiberizer when the temperature of the molten slag measured by the temperature measuring device is in a predetermined temperature range. Coal ash melting fiberizing apparatus, characterized in that.   In a coal ash melting and fiberizing apparatus for melting and fiberizing coal ash, a melting furnace having a structure for melting coal ash using coal as fuel and dropping molten slag from a lower slag tap, and molten slag discharged from the slag tap A slag pond that stores slag, a slag that guides molten slag from the slag pond, and a fiberizer that blows air to the molten slag that flows out from the outlet of the slag and falls to disperse the molten slag into a fiber And a molten slag taping means for overflowing the molten slag at a position higher than the tapping port so that the tapping port of the paddle is filled with molten slag, and monitoring the taping port to form a molten slag pool. A coal ash melt fiberizing apparatus, comprising: a fiberizer control device configured to operate the fiberizer when in operation.   In a coal ash melting and fiberizing apparatus for melting and fiberizing coal ash, a melting furnace having a structure for melting coal ash using coal as fuel and dropping molten slag from a lower slag tap, and molten slag discharged from the slag tap A slag pond that stores slag, a slag that induces molten slag from the slag pond, and a fiberizer that blows air to the molten slag that flows out from the outlet of the slag and falls to disperse the molten slag into a fiber A molten slag taping means for overflowing the molten slag at a position higher than the tapping port so that the tapping port of the paddle is filled with molten slag, and a molten slag that flows out and falls from the tapping port of the paddle A coal ash melt fiberizing apparatus comprising a fiberizer control device that monitors the flow down state and operates the fiberizer when the flow of molten slag is continuous   In a coal ash melting and fiberizing apparatus for melting and fiberizing coal ash, a melting furnace having a structure for melting coal ash using coal as fuel and dropping molten slag from a lower slag tap, and molten slag discharged from the slag tap A slag pond that stores slag, a slag that guides molten slag from the slag pond, and a fiberizer that blows air to the molten slag that flows out from the outlet of the slag and falls to disperse the molten slag into a fiber A molten slag taping means for overflowing the molten slag at a position higher than the tapping outlet so that the tapping outlet of the paddle is filled with the molten slag, and Provided so as to surround the molten slag that has fallen without being fiberized, the water tank that receives the molten slag that has flowed out by the molten slag taping means, and the tank outlet and the water tank The slag discharge cylinder, coal ash melting fiberizing apparatus characterized by comprising a control device for controlling the slag discharge tube to a negative pressure.

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