US20030097968A1 - Ash melting apparatus - Google Patents
Ash melting apparatus Download PDFInfo
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- US20030097968A1 US20030097968A1 US09/979,399 US97939901A US2003097968A1 US 20030097968 A1 US20030097968 A1 US 20030097968A1 US 97939901 A US97939901 A US 97939901A US 2003097968 A1 US2003097968 A1 US 2003097968A1
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- United States
- Prior art keywords
- crucible
- ash
- furnace body
- furnace
- melting apparatus
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/06—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in pot furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/1005—Forming solid beads
- C03B19/1045—Forming solid beads by bringing hot glass in contact with a liquid, e.g. shattering
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/109—Glass-melting furnaces specially adapted for making beads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/20—Combustion to temperatures melting waste
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/30—Solid combustion residues, e.g. bottom or flyash
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/01007—Thermal treatments of ash, e.g. temper or shock-cooling for granulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/10—Crucibles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B2014/002—Smelting process, e.g. sequences to melt a specific material
- F27B2014/004—Process involving a smelting step, e.g. vaporisation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D2001/0046—Means to facilitate repair or replacement or prevent quick wearing
- F27D2001/005—Removable part or structure with replaceable elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Definitions
- the present invention relates to an apparatus for melting ash, particularly to an extremely efficient and downsizable apparatus which is directed to detoxifying and reusing ash to be left after incineration of industrial waste, and which melts ash to convert it into the form of granule, block or fiber.
- the above method involve problems that, while the furnace is heated to a high temperature of 2,000° C. or higher and it is difficult to carry out temperature control, there is substantially no furnace material which can withstand such temperatures, and in order to cope with the high temperatures, the thickness of furnace materials is increased, leading to increase in size of the furnace; and that since the furnace body undergoes wearing heavily and since there is taken no countermeasure for it, the furnace body needs wholesale servicing under long-term interruption of operation of the apparatus in a short cycle, leading to extremely low production efficiency and increase in maintenance cost of equipment.
- Japanese Unexamined Patent Publication Nos. Hei 10-220964, 2000-039267 and 2000-097425 each disclose an ash melting apparatus utilizing a phenomenon of the generally so-called thermit reaction to be induced by heating a mixture of a metal oxide and an aluminum powder to generate a large quantity of heat by oxidation of aluminum.
- the apparatus likewise involves the problems as described above, since it is difficult here again to carry out temperature control, and since the apparatus is frequently heated to a temperature of 2,000° C. or higher.
- Japanese Unexamined Patent Publication No. Hei 8-226622 which is directed to providing an inexpensive and small-sized ash melting apparatus, containing a furnace body having an exhaust port, a mechanism of feeding ash into the furnace body and a burner for burning a heavy oil in the furnace body, discloses a constitution in which the furnace body contains means for supplying a gas which increases susceptibility of a fuel to burn, and the exhaust port is of such a size as will increase the internal pressure of the furnace body.
- the present invention is directed to attaining easily a target temperature of 1,600 to 1650° C. without increasing the internal temperature of the furnace; to increase durability of the furnace body by reducing wastage thereof due to ease of temperature control and to absence of abnormal temperature rise to 2,000° C.
- the following measures were taken: wearing of the furnace body is reduced by using a less-wearing crucible as the innermost layer of the furnace body and by facilitating temperature control so as to avoid abnormal temperature rise; the crucible is allowed to have the form of cartridge so as to fully facilitate replacement thereof; an oil having a small number of carbon atoms such as propane and butane is used mainly as a fuel, which is subjected to complete combustion in the presence of a relatively small amount (approximately equivalent amount) of oxygen gas or air supplied at a relatively low flow rate during combustion in well-ventilated normal condition without regulation of ventilation for pressurization, so as to fully attain necessary temperatures; and means is employed for arranging a burner, an ash charge port, etc. in position so as to improve heat efficiency.
- FIG. 1 is a sectional side elevation showing an embodiment of the present invention.
- FIG. 1 shows an embodiment in the present invention, which is composed essentially of a furnace body 1 , a cover 2 , a burner section 3 , a crucible 4 , an ash charge port 5 , a crucible ejector rod 6 and a temperature sensor 7 .
- the furnace body 1 desirably has a columnar appearance, it may have an appearance of polygonal prism such as a quadratic prism.
- the furnace wall has a six-layer structure having the crucible 4 as the innermost layer, a fluidized sand bed 11 , a first refractory layer 8 , a second refractory layer 9 , a third refractory layer 10 and an iron housing 12 arranged in this order.
- the furnace body 1 has the ash charge port 5 defined on a lateral side around the center, the crucible ejector rod 6 located in the right wall, a discharge port 13 located at a lower left position for discharging a molten ash 14 and for ventilation, and the temperature sensor 7 at an upper left position to secure such a falling position 18 in the crucible 4 so that the molten ash 14 can fall without being brought into contact with a wall surface 16 of the discharge port 13 .
- the location of the ash charge port 5 is not limited to the-position described above but may be located, for example, in the right wall or top.
- the crucible 4 for example, a refractory graphite-silicon carbide crucible (C: 30 to 55%; SiC: 30 to 50%) commercially manufactured by Nippon Crucible, by molding a refractory material to have predetermined dimensions and baking the resulting molded product.
- the thus obtained crucible wears less than conventional refractory bricks and castable refractories.
- the first refractory layer 8 and the second refractory layer 9 there can be used castable refractories, crucibles or refractory bricks.
- a material having higher heat resistance is used for first refractory layer 8 rather than for the second refractory layer 9 .
- a board or a heat-insulating castable can be used for the third refractory layer 10 .
- the cover 2 is composed essentially of a first refractory layer 8 , a second refractory layer 9 , a third refractory layer 10 and an iron housing 12 like the furnace body 1 and has the burner 3 at the center.
- the cover 2 is designed to be opened and closed easily with hinges attached to one side thereof and to be openably fastened intimately to the furnace body 1 with screws or the like, as shown in FIG. 1.
- the burner 3 to be employed in the present invention is desirably of such a type that uses a petroleum gas such as propane gas and butane gas as a fuel which is subjected to complete combustion with the aid of a relatively small amount (approximately equivalent amount) of oxygen gas or air. Since the exhaust gas formed by combustion of the gas is relatively clean, and since the gases are injected from the burner 3 under a relatively low pressure, scattering of ash is reduced, so that the amount of ash contained in the exhaust gas can be reduced. In addition, ash is designed to be charged into the furnace around the center of the crucible 4 , i.e. the highest temperature zone, to which flames from the burner 3 direct. Therefore, the ash starts to melt immediately after charging. As described above, since the furnace has a rational constitution to show excellent heat efficiency, there can be used a city gas containing inexpensive natural gasses or fossil fuels such as kerosene.
- the furnace In operating the furnace of the present invention shown in FIG. 1, the furnace is set as shown in FIG. 1, and then a mixture of propane gas and an approximately equivalent amount of oxygen gas is ignited immediately after it is injected from the burner 3 . If ash is charged through the ash charge port 5 after confirmation of the state where the internal furnace temperature being controlled between 1,600 and 1,650° C. by the temperature sensor 7 , scattering of ash can be reduced due to the low flame injecting rate, and the ash starts to melt speedily since the high-temperature state can be obtained easily.
- the molten ash 14 forms a pasty liquid, which falls, through the discharge port 13 into water 15 to be granulated therein. It should be noted here that if the pasty liquid is taken into the atmosphere and is cooled slowly, it forms a block. Meanwhile, the block can be drawn into fibers that can be utilized effectively as aggregate or reinforcing material for concrete.
- the furnace when the crucible 4 is worn out after a long-term use and needs replacement with new one, the furnace is cooled, and then the cover 2 is opened to around 180°. In this state, the furnace body 1 is pivoted on a boss 17 formed on the sidewall thereof to allow the cover 2 to face downward.
- the crucible 4 is then pushed with the crucible ejector rod 6 under hydraulic driving or manual screw driving, the crucible 4 can be taken out from the furnace easily under the action of the fluidized sand bed 11 . Thus, replacement of crucible can be carried out extremely easily.
- the ash melting apparatus in the present invention is designed to be able to pivot on the boss 17 of the furnace body 1 and to be locked, so that the inclination of the furnace body 1 can be set at a desired angle to enable adjustment of the exit velocity of the molten ash 14 .
- the ash melting apparatus according to the present invention has the constitution as described above and exhibits the following effects:
- the crucible serving as the innermost layer of the furnace body is made into the form of cartridge, and also the furnace body is originally designed to have a structure facilitating removing of the crucible, making the operation of replacing the worn-out crucible with new one extremely easy;
- the furnace Since the furnace is designed to have a constitution in which flames are injected under low pressure toward the center of the crucible, the furnace shows excellent heat efficiency, readily provides high temperature levels and can reduce the running cost; and
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasification And Melting Of Waste (AREA)
- Processing Of Solid Wastes (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Furnace Details (AREA)
Abstract
The furnace body uses a crucible as the innermost layer thereof to reduce wearing of furnace materials and achieve downsizing of the furnace body; the crucible is made into the form of cartridge so as to fully facilitate replacement thereof; a mixture of a petroleum gas such as propane and butane and an oxygen gas or air is used mainly as a fuel, which is subjected to complete combustion to ensure complete combustion of the fuel, as well as, sufficient temperature control; and means is employed for contriving arrangement of the burner, the ash charge port, etc. so as to improve heat efficiency, thus facilitating temperature control in the furnace, reducing wearing of the furnace body and facilitating repair of the furnace.
Description
- The present invention relates to an apparatus for melting ash, particularly to an extremely efficient and downsizable apparatus which is directed to detoxifying and reusing ash to be left after incineration of industrial waste, and which melts ash to convert it into the form of granule, block or fiber.
- Today, dioxin, heavy metals, etc. contained in ash to be left as waste after incineration of domestic, industrial and hospital refuse and discarded in the environment are giving rise to serious social problems, and means for treating them have been sought for.
- There have recently been disclosed methods as means for treating such ash waste, which carry out melting and solidification of ash to achieve weight reduction and detoxification thereof. For example, Japanese Unexamined Patent Publication No. Hei 05-261358 discloses a method in which melting of ash is carried out by means of arc melting and resistance melting.
- The above method involve problems that, while the furnace is heated to a high temperature of 2,000° C. or higher and it is difficult to carry out temperature control, there is substantially no furnace material which can withstand such temperatures, and in order to cope with the high temperatures, the thickness of furnace materials is increased, leading to increase in size of the furnace; and that since the furnace body undergoes wearing heavily and since there is taken no countermeasure for it, the furnace body needs wholesale servicing under long-term interruption of operation of the apparatus in a short cycle, leading to extremely low production efficiency and increase in maintenance cost of equipment.
- Meanwhile, for example, Japanese Unexamined Patent Publication Nos. Hei 10-220964, 2000-039267 and 2000-097425 each disclose an ash melting apparatus utilizing a phenomenon of the generally so-called thermit reaction to be induced by heating a mixture of a metal oxide and an aluminum powder to generate a large quantity of heat by oxidation of aluminum. However, the apparatus likewise involves the problems as described above, since it is difficult here again to carry out temperature control, and since the apparatus is frequently heated to a temperature of 2,000° C. or higher.
- Meanwhile, Japanese Unexamined Patent Publication No. Hei 8-226622, which is directed to providing an inexpensive and small-sized ash melting apparatus, containing a furnace body having an exhaust port, a mechanism of feeding ash into the furnace body and a burner for burning a heavy oil in the furnace body, discloses a constitution in which the furnace body contains means for supplying a gas which increases susceptibility of a fuel to burn, and the exhaust port is of such a size as will increase the internal pressure of the furnace body.
- Since the main purpose of the above method is to use heavy oil as a fuel, use of the fuel having a large number of carbon atoms requires a large quantity of air necessary for achieving complete combustion thereof, and the air cools the furnace to prevent the internal temperature of the furnace from rising to a sufficient level. Therefore, ventilation is regulated to provide an increased pressure in the furnace so as to reduce cooling and to attain the predetermined temperature. However, the insufficient ventilation makes it difficult to maintain well the state of complete combustion, bringing about problems including insufficient temperature, abnormal combustion, noxious gas formation and scattering of ash.
- In view of the problems described above, the present invention is directed to attaining easily a target temperature of 1,600 to 1650° C. without increasing the internal temperature of the furnace; to increase durability of the furnace body by reducing wastage thereof due to ease of temperature control and to absence of abnormal temperature rise to 2,000° C. or higher; to further extend the periodical servicing cycle of the furnace by using a less-wearing material in a zone of the innermost layer of the furnace containing a plurality of layers to be brought into contact with a high-temperature molten ash; and to make the furnace body of the innermost layer into a form of cartridge to enable easy replacement thereof, thus reducing out-of-production period for troubleshooting of the furnace body, improving production efficiency by a wide margin and enabling downsizing of the furnace body.
- In the present invention, in order to attain the subjects described above, the following measures were taken: wearing of the furnace body is reduced by using a less-wearing crucible as the innermost layer of the furnace body and by facilitating temperature control so as to avoid abnormal temperature rise; the crucible is allowed to have the form of cartridge so as to fully facilitate replacement thereof; an oil having a small number of carbon atoms such as propane and butane is used mainly as a fuel, which is subjected to complete combustion in the presence of a relatively small amount (approximately equivalent amount) of oxygen gas or air supplied at a relatively low flow rate during combustion in well-ventilated normal condition without regulation of ventilation for pressurization, so as to fully attain necessary temperatures; and means is employed for arranging a burner, an ash charge port, etc. in position so as to improve heat efficiency.
- FIG. 1 is a sectional side elevation showing an embodiment of the present invention.
- FIG. 1 shows an embodiment in the present invention, which is composed essentially of a
furnace body 1, acover 2, aburner section 3, acrucible 4, anash charge port 5, a crucible ejector rod 6 and atemperature sensor 7. - While the
furnace body 1 desirably has a columnar appearance, it may have an appearance of polygonal prism such as a quadratic prism. The furnace wall has a six-layer structure having thecrucible 4 as the innermost layer, a fluidizedsand bed 11, a firstrefractory layer 8, a secondrefractory layer 9, a thirdrefractory layer 10 and aniron housing 12 arranged in this order. Thefurnace body 1 has theash charge port 5 defined on a lateral side around the center, the crucible ejector rod 6 located in the right wall, adischarge port 13 located at a lower left position for discharging amolten ash 14 and for ventilation, and thetemperature sensor 7 at an upper left position to secure such a fallingposition 18 in thecrucible 4 so that themolten ash 14 can fall without being brought into contact with awall surface 16 of thedischarge port 13. Here, the location of theash charge port 5 is not limited to the-position described above but may be located, for example, in the right wall or top. - As the
crucible 4, for example, a refractory graphite-silicon carbide crucible (C: 30 to 55%; SiC: 30 to 50%) commercially manufactured by Nippon Crucible, by molding a refractory material to have predetermined dimensions and baking the resulting molded product. The thus obtained crucible wears less than conventional refractory bricks and castable refractories. As the firstrefractory layer 8 and the secondrefractory layer 9, there can be used castable refractories, crucibles or refractory bricks. A material having higher heat resistance is used for firstrefractory layer 8 rather than for the secondrefractory layer 9. A board or a heat-insulating castable can be used for the thirdrefractory layer 10. - The
cover 2 is composed essentially of a firstrefractory layer 8, a secondrefractory layer 9, a thirdrefractory layer 10 and aniron housing 12 like thefurnace body 1 and has theburner 3 at the center. Thecover 2 is designed to be opened and closed easily with hinges attached to one side thereof and to be openably fastened intimately to thefurnace body 1 with screws or the like, as shown in FIG. 1. - The
burner 3 to be employed in the present invention is desirably of such a type that uses a petroleum gas such as propane gas and butane gas as a fuel which is subjected to complete combustion with the aid of a relatively small amount (approximately equivalent amount) of oxygen gas or air. Since the exhaust gas formed by combustion of the gas is relatively clean, and since the gases are injected from theburner 3 under a relatively low pressure, scattering of ash is reduced, so that the amount of ash contained in the exhaust gas can be reduced. In addition, ash is designed to be charged into the furnace around the center of thecrucible 4, i.e. the highest temperature zone, to which flames from theburner 3 direct. Therefore, the ash starts to melt immediately after charging. As described above, since the furnace has a rational constitution to show excellent heat efficiency, there can be used a city gas containing inexpensive natural gasses or fossil fuels such as kerosene. - In operating the furnace of the present invention shown in FIG. 1, the furnace is set as shown in FIG. 1, and then a mixture of propane gas and an approximately equivalent amount of oxygen gas is ignited immediately after it is injected from the
burner 3. If ash is charged through theash charge port 5 after confirmation of the state where the internal furnace temperature being controlled between 1,600 and 1,650° C. by thetemperature sensor 7, scattering of ash can be reduced due to the low flame injecting rate, and the ash starts to melt speedily since the high-temperature state can be obtained easily. Themolten ash 14 forms a pasty liquid, which falls, through thedischarge port 13 intowater 15 to be granulated therein. It should be noted here that if the pasty liquid is taken into the atmosphere and is cooled slowly, it forms a block. Meanwhile, the block can be drawn into fibers that can be utilized effectively as aggregate or reinforcing material for concrete. - In the present invention, when the
crucible 4 is worn out after a long-term use and needs replacement with new one, the furnace is cooled, and then thecover 2 is opened to around 180°. In this state, thefurnace body 1 is pivoted on aboss 17 formed on the sidewall thereof to allow thecover 2 to face downward. The crucible 4 is then pushed with the crucible ejector rod 6 under hydraulic driving or manual screw driving, thecrucible 4 can be taken out from the furnace easily under the action of thefluidized sand bed 11. Thus, replacement of crucible can be carried out extremely easily. - Further, the ash melting apparatus in the present invention is designed to be able to pivot on the
boss 17 of thefurnace body 1 and to be locked, so that the inclination of thefurnace body 1 can be set at a desired angle to enable adjustment of the exit velocity of themolten ash 14. In addition, it is desirable to apply to thewall surface 16 of the discharge port 13 a cylindricaladhesion preventing material 19 of the same composition as the crucible so as to prevent deposition and solidification of the molten ash on thewall surface 16. - Industrial Applicability
- The ash melting apparatus according to the present invention has the constitution as described above and exhibits the following effects:
- (1) The use of a refractory crucible as the innermost layer of the furnace body can reduce wearing of the furnace material in normal operations at a temperature of 1,600 to 1,650° C.;
- (2) The crucible serving as the innermost layer of the furnace body is made into the form of cartridge, and also the furnace body is originally designed to have a structure facilitating removing of the crucible, making the operation of replacing the worn-out crucible with new one extremely easy;
- (3) The adoption of the system for achieving complete combustion of propane gas having a small number of carbon atoms used mainly as a fuel in the presence of an approximately equivalent amount of oxygen gas or the like can afford easily sufficient temperature levels necessary for melting ash under full ventilation without pressurization, while the ease of temperature control can reduce notably wearing of the furnace due to abnormal temperature rise;
- (4) The use of the fuel described above forms a relatively clean exhaust gas, and the gases are supplied at a relatively low flow rate to reduce scattering of ash, facilitating treatment of the exhaust gas;
- (5) Since the furnace is designed to have a constitution in which flames are injected under low pressure toward the center of the crucible, the furnace shows excellent heat efficiency, readily provides high temperature levels and can reduce the running cost; and
- (6) Since wearing of the furnace is reduced as described above, intervals of the servicing cycle of the furnace can be extended notably; and the thickness of the furnace wall need not be increased so much, so that the furnace can be downsized, in addition, durability of the furnace can totally be improved significantly.
Claims (9)
1. An ash melting apparatus containing a furnace body having a discharge port and an ash charge port, and a cover having a burner substantially at the center;
wherein the furnace body comprises a replaceable crucible as an innermost layer; the crucible having an opening facing toward the cover.
2. The ash melting apparatus according to claim 1 , further comprising a fluidized sand bed 11 between the crucible 4 and a first refractory layer 8 in the furnace body 1.
3. The ash melting apparatus according to claim 1 , characterized in that the crucible 4 of the furnace body 1 is designed to be ejected by abutting a crucible ejector rod 6 against a side face of the crucible 4.
4. The ash melting apparatus according to claim 1 , characterized in that flame from the burner 3 is directed toward a cavity of the crucible 4.
5. The ash melting apparatus according to claim 1 , characterized in that a petroleum gas such as propane gas and butane gas or a city gas is used as a fuel of the burner in combination with an oxygen gas.
6. The ash melting apparatus according to claim 1 , characterized in that a petroleum gas such as propane gas and butane gas or a city gas is used as a fuel of the burner in combination with air.
7. The ash melting apparatus according to claim 1 , characterized in that the ash charge port 5 is located around the center of a side face of the furnace body 1.
8. The ash melting apparatus according to claim 1 , characterized in that, in a falling position 18 of a molten ash 14, the molten ash 14 is allowed to be located in such a position as is not brought into contact with a wall surface 16 of the discharge port 13.
9. The ash melting apparatus according to claim 1 , characterized in that the discharge port 13 is provided on the wall surface 16 with an adhesion preventive material 19.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2000-324734 | 2000-09-19 | ||
JP324734/2000 | 2000-09-19 | ||
JP2000324734A JP2002089822A (en) | 2000-09-19 | 2000-09-19 | Ash melting apparatus |
PCT/JP2001/008071 WO2002025172A1 (en) | 2000-09-19 | 2001-09-17 | Ash melting device |
Publications (2)
Publication Number | Publication Date |
---|---|
US20030097968A1 true US20030097968A1 (en) | 2003-05-29 |
US6571721B1 US6571721B1 (en) | 2003-06-03 |
Family
ID=18802204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/979,399 Expired - Fee Related US6571721B1 (en) | 2000-09-19 | 2001-09-17 | Ash melting apparatus |
Country Status (8)
Country | Link |
---|---|
US (1) | US6571721B1 (en) |
EP (1) | EP1319893A1 (en) |
JP (1) | JP2002089822A (en) |
KR (1) | KR20020041335A (en) |
CN (1) | CN1388881A (en) |
AU (1) | AU8805601A (en) |
TW (1) | TW505765B (en) |
WO (1) | WO2002025172A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130302217A1 (en) * | 2010-12-21 | 2013-11-14 | Finaxo Environnement | Heating module, heating system including a plurality of heating modules, and facility including such a heating system |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003074828A (en) * | 2001-08-29 | 2003-03-12 | Hikari Tekku Kk | Melting device for ash |
JP5827368B2 (en) * | 2014-04-23 | 2015-12-02 | 中外炉工業株式会社 | Method for removing deposits from hot metal ladle and apparatus for removing deposits from hot metal ladle |
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JP2000097425A (en) | 1998-09-22 | 2000-04-04 | Imanaka:Kk | Waste melting system |
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2000
- 2000-09-19 JP JP2000324734A patent/JP2002089822A/en active Pending
-
2001
- 2001-09-17 US US09/979,399 patent/US6571721B1/en not_active Expired - Fee Related
- 2001-09-17 EP EP01967715A patent/EP1319893A1/en not_active Withdrawn
- 2001-09-17 AU AU88056/01A patent/AU8805601A/en not_active Abandoned
- 2001-09-17 KR KR1020017016075A patent/KR20020041335A/en not_active Application Discontinuation
- 2001-09-17 WO PCT/JP2001/008071 patent/WO2002025172A1/en not_active Application Discontinuation
- 2001-09-17 CN CN01802476A patent/CN1388881A/en active Pending
- 2001-09-19 TW TW090123076A patent/TW505765B/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130302217A1 (en) * | 2010-12-21 | 2013-11-14 | Finaxo Environnement | Heating module, heating system including a plurality of heating modules, and facility including such a heating system |
US9291394B2 (en) * | 2010-12-21 | 2016-03-22 | Finaxo Environment | Heating module, a heating system including a plurality of heating modules, and an installation including such a heating system |
Also Published As
Publication number | Publication date |
---|---|
CN1388881A (en) | 2003-01-01 |
TW505765B (en) | 2002-10-11 |
KR20020041335A (en) | 2002-06-01 |
US6571721B1 (en) | 2003-06-03 |
AU8805601A (en) | 2002-04-02 |
WO2002025172A1 (en) | 2002-03-28 |
JP2002089822A (en) | 2002-03-27 |
EP1319893A1 (en) | 2003-06-18 |
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