EP1347236A1 - Four de fusion a gazeification de dechets et procede de fonctionnement de ce four de fusion - Google Patents

Four de fusion a gazeification de dechets et procede de fonctionnement de ce four de fusion Download PDF

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Publication number
EP1347236A1
EP1347236A1 EP01961244A EP01961244A EP1347236A1 EP 1347236 A1 EP1347236 A1 EP 1347236A1 EP 01961244 A EP01961244 A EP 01961244A EP 01961244 A EP01961244 A EP 01961244A EP 1347236 A1 EP1347236 A1 EP 1347236A1
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EP
European Patent Office
Prior art keywords
furnace
melting
waste
gas
furnace body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01961244A
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German (de)
English (en)
Other versions
EP1347236A4 (fr
Inventor
Torakatsu Miyashita
Mitsuharu Kishimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
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Publication date
Application filed by Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
Publication of EP1347236A1 publication Critical patent/EP1347236A1/fr
Publication of EP1347236A4 publication Critical patent/EP1347236A4/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/723—Controlling or regulating the gasification process
    • 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
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
    • F23G5/0276—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage using direct heating
    • 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
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
    • 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
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
    • F23G5/165—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber arranged at a different level
    • 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
    • F23G5/24—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a vertical, substantially cylindrical, combustion chamber
    • 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
    • F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
    • 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
    • F23J1/08—Liquid slag removal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/12—Heating the gasifier
    • C10J2300/1215—Heating the gasifier using synthesis gas as fuel
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
    • C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
    • C10J2300/1823—Recycle loops, e.g. gas, solids, heating medium, water for synthesis gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/30—Pyrolysing
    • F23G2201/304—Burning pyrosolids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/40—Gasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2202/00—Combustion
    • F23G2202/10—Combustion in two or more stages
    • F23G2202/104—Combustion in two or more stages with ash melting stage
    • 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

Definitions

  • the present invention relates to a waste gasification-melting furnace in which municipal waste, industrial waste, and the like are heated, dried, and thermally decomposed to allow incombustible matter to be discharged as slag, and a pyrolysis gas generated inside the furnace is treated by an exhaust gas treating device and discharged, and a method of operating the gasification-melting furnace. More particularly, the present invention relates to a waste gasification-melting furnace capable of improving fluctuation and unstability in a system due to variation in waste in melting ash generated by drying and thermally decomposing the waste in a single furnace, and a method of operating the gasification-melting furnace.
  • a shaft furnace is used as a gasification-melting furnace of this type, as well as a rotary kiln or a fluidized bed furnace.
  • waste A is fed into a furnace 51, and fuel R and oxygen-enriched air P are introduced from a bottom portion of the furnace 51 into the furnace through burners 52 or the like, thereby heating and melting the waste A.
  • the waste A being heated and melted is balanced by a pressure of a high-temperature (e.g., 1700 °C) combustion gas Q containing large amount of oxygen gas introduced from the bottom of the furnace, thereby causing a melting zone at a boundary between the combustion gas Q and the waste A to be dome-shaped 53.
  • a high-temperature e.g., 1700 °C
  • the molten slag S flows downward and is discharged outside the furnace 51. Meanwhile, the combustion gas Q flows upward through a void in the waste A bed in the furnace 51. The combustion gas Q dries the waste A in an upper portion inside the furnace 51, and thermally decomposes the dried waste A in an intermediate portion inside the furnace 51, and during this time, a pyrolysis gas G is generated from combustible component. The pyrolysis gas G is discharged through an exhaust port 55.
  • the waste A inside the furnace 51 go through a dry step and a pyrolysis step and residue resulting from pyrolysis gradually moves downward to a vicinity of the bottom of the furnace 51 by gravity. As described above, the residue including carbon is heated, reacted with oxygen, and melted by the high-temperature combustion gas and the resulting slag S is taken out from the furnace 51.
  • one feature of the shaft furnace is that it can efficiently achieve a high-temperature condition. Specifically, the waste supplied into the shaft furnace moves downward while being combusted, and the generated gas flows upward while heating the supplied waste.
  • the waste i.e., solid waste, moves downward by gravity, whereas the lightweight gas moves upward. Direct heat exchange between the waste and the gas can be achieved very efficiently.
  • large retention time of the waste in the furnace reduces bad effect to the process due to variation in properties of the waste.
  • the melting zone 53 is kept dome-shaped while a balance between a load of the waste A inside the furnace body and a pressure of the combustion gas (high-temperature gas) Q being introduced from the bottom portion of the furnace and moving upward is maintained. In such state, there are small holes in the dome zone and the combustion gas passes through the holes. Then, the combustion gas pressure is maintained due to the pressure loss of the gas passing through the holes.
  • the dome zone 53 becomes deformed accompanying large hole and part of the combustion gas Q goes up by through the large hole of the dome zone 53.
  • the waste has various variation factors. For example, when highly moist waste is supplied, water vapor is generated vigorously. In the case of plastic waste, the amount of generated gas is greatly increased in a short time, or the melted waste adheres to a furnace wall. In the case of waste including sheet-shaped or plate-shaped waste, a gas flows unevenly in a furnace. Difference in properties of waste (difference in heating value) causes an increase or decrease in the generated pyrolysis gas or difference in temperature of the generated pyrolysis gas, which leads to an unstable reaction. As a result, waste adheres to a portion of the furnace and the waste layer located above hangs without moving downward. In the meantime, the hanging waste becomes unsupportable because a hollow space is formed in a lower part of the waste layer and then slips abruptly, which is called a "slip". Under these influences, the dome-shaped melting zone 53 is sometimes broken.
  • exhaust gas G discharged from the furnace fluctuates.
  • the waste A, limestone M and coke N are fed thereinto through a supplying shoot 64 and dried and thermally decomposed, and thereafter an oxygen gas O and air P are introduced from a vicinity of a bottom portion of the furnace 61 into the furnace 61 for continuous combustion.
  • a large quantity of water e.g., 30 to 50%
  • water is evaporated from the waste A and dried by a combustion gas Q moving upward in an upper portion inside the furnace 61, and thereafter, the waste A is thermally decomposed in an intermediate portion under the upper portion to cause combustible matter in the waste to be gasified.
  • the coke is combusted by oxygen O and air P introduced through tuyers 62 and 63. Then, residue resulting from the pyrolysis, with combustible matter in the coke are actively heated, melted and converted to a molten slag in a lower portion of the furnace 61, and the resulting slag is taken out by a slag discharge machine 65 and a combustible pyrolysis gas G mainly generated during pyrolysis is discharged through an exhaust port 66.
  • the combustible pyrolysis gas is used as a fuel for generating a steam by a boiler or the like and generating a power in a generator by a steam turbine.
  • drying and pyrolysis are performed in the rotary kiln or the fluidized bed to produce uncombustible and incombustible matter, and the generated uncombustible matter and incombustible matter are heated up to a high temperature to be melted.
  • the present invention has been developed in view of the above problems, and an object of the present invention is to provide a waste gasification-melting furnace (process) that has high heat efficiency and is stably operated, by organically and integrally combining two furnaces (processes) comprised of the conventional melting furnace of the shaft furnace type and the conventional ash melting furnace, by melting char (residue resulting from pyrolysis, composed of carbon or and incombustible ash) generated in the conventional melting furnace portion in the ash melting furnace portion, and by introducing (feeding) a high-temperature gas (hereinafter also referred to as a high-temperature gas) generated in the ash melting furnace portion into the melting furnace portion to cause waste to be heated and thermally decomposed, and a method of operating the waste gasification-melting furnace that uses an inexpensive oil as a fuel instead of an expensive gas fuel used in the conventional melting furnace.
  • a high-temperature gas hereinafter also referred to as a high-temperature gas
  • a waste gasification-melting furnace comprising a gasifying furnace body of a shaft furnace type or a fluidized bed type, for drying and pyrolysis of waste sequentially supplied from above into the furnace by using a high-temperature gas; and a melting chamber furnace provided continuously with a lower end discharge port of the gasifying furnace body, for receiving residue of the waste resulting from pyrolysis, the melting chamber furnace being provided with a heating and melting burner directed toward a slope of the residue, wherein the melting chamber furnace is provided with a discharge port through which molten substances containing molten slag and molten metal are discharged, and a mechanism inside thereof, for feeding a high-temperature pyrolysis gas generated during heating and melting of the residue to the gasifying furnace body.
  • oxygen containing gas and a fuel are introduced into the furnace through burners to heat and melt the residue resulting from pyrolysis inside the melting furnace and is combusted with carbon remaining in the residue.
  • incombustible matter in the residue is melted and converted into slag.
  • Oxygen more than a theoretical combustion amount to be equivalent for fuel is fed.
  • Chloride metal in the residue is oxidized. For example, iron is converted into iron oxide and copper is converted into copper oxide, and these oxides are discharged in a melted and mixed state with the slag.
  • the present invention basically uses an oxygen atmosphere and therefore almost all of metal is oxidized and is well combined with slag. Therefore, it is not necessary to separate the metal from the slag for reuse.
  • the melted metal oxide and the slag may be used for roadbed paving, after being cooled.
  • the high-temperature gas After being used for melting the residue inside the melting chamber furnace, the high-temperature gas is fed to the furnace body to be used for drying or thermally decomposing the waste. Therefore, most of sensible heat owned by the high-temperature gas is used for reaction with the waste and temperature of the exhaust gas discharged from the furnace is reduced to, for example about 300°C.
  • the gasification-melting furnace of the present invention has high efficiency like a general shaft furnace type melting furnace without large energy loss, and as a result, fuel consumption, power consumption, and oxygen gas consumption are all reduced, which leads to a reduced running cost.
  • the melting chamber furnace is independent of the gasifying furnace body and only the refractory in the space inside the melting chamber furnace is damaged, therefore, maintenance is easily accomplished by spraying mud, made of wet refractory powder onto the damaged refractory wall, and as a result, the rate of operation is very high. Further, since the furnace has a simple structure, the furnace is easily handled and operation and maintenance are easy.
  • the furnace is operated stably regardless of larger variation in the amount of feeding waste per unit time. Since the flow rate and properties of the exhaust gas discharged from the top portion of the furnace are stable, the exhaust gas can be treated properly. In other words, since the flow rate, composition and temperature of the generated gas, which are important factors in operating the gasification melting furnace, are stable, excess air for dealing with sudden change in the amount of the gas can be minimized. This suppresses generation of carbon monoxide, generation of dioxin, NOx, and SOx, and correspondingly reduces the amount of spent gas cleaning chemicals such as urea, activated carbon and slaked lime, and the amount of flying ash.
  • the flow rate and properties of the exhaust gas discharged from the top portion of the furnace are stable, the exhaust gas can be treated properly. In other words, since the flow rate, composition and temperature of the generated gas, which are important factors in operating the gasification melting furnace, are stable, excess air for dealing with sudden change in the amount of the gas can be minimized. This suppresses generation of carbon monoxide,
  • a plasma burner can be applied instead of a burner for combusting a fossil fuel or various gas fuels.
  • an oxygen or oxygen-enriched air is introduced into the high-temperature gas feed path from the melting chamber furnace to the gasifying furnace body to allow temperature of the high-temperature gas being fed into the gasifying furnace body to be lowered and concentration of oxygen to be increased by the oxygen or oxygen-enriched air.
  • the temperature of the high-temperature gas can be lowered by introducing a normal-temperature oxygen-containing gas into the high-temperature gas fed into the gasifying furnace body.
  • a normal-temperature oxygen-containing gas introduced from outside into the furnace body is less likely to fully react with the waste, but by introducing the oxygen-containing gas under a high-temperature condition together with the high-temperature gas, the waste reacts with oxygen and is partially combusted.
  • the temperature of a gas mixture is lowered, but heat generated from reaction between the oxygen and the waste increases temperature of the corresponding portion.
  • the amount of the introduced oxygen By adjusting the amount of the introduced oxygen to obtain the temperature at which the residue is hardly softened (hardly start partial melting), the residue can be stably fed into the melting chamber.
  • a feed path may be provided at a position where the gasifying furnace body is connected to the melting chamber furnace, or a lower portion inside the gasifying furnace body may be connected to a space inside the melting chamber furnace by means of a duct to allow the high-temperature gas to be fed from the melting chamber furnace to the gasifying furnace body.
  • the waste gasification-melting furnace may comprise a mechanism for delivering the residue resulting from thermal decomposition, which is a screw type, a rotating vane type, or a pusher type, the mechanism being provided in the vicinity of a position where the gasifying furnace body is connected to the melting chamber furnace. Since the residue moves downward by gravity along a repose angle by the amount of the residue melted in the melting chamber furnace, it is continuously delivered. Desirably, large substances or abnormal condition such as hanging should be taken into account.
  • the residue generated inside the gasifying furnace body is charged quantitatively into the melting chamber furnace by the delivery mechanism, or the charging rate of the residue is adjusted depending on the melted state of the residue inside the melting chamber furnace.
  • the melting chamber furnace may be provided with a tuyere inside thereof through which an oxygen-containing gas is introduced into the residue resulting from thermal decomposition.
  • temperature of the pyrolysis region inside the gasifying furnace body can be set to around 800°C while adjusting the amount of excess oxygen.
  • the gasification-melting furnace may be equipped with a control device capable of adjusting temperature of the high-temperature gas being fed from the melting chamber furnace into the gasifying furnace body to be set to 1000 to 1300°C, and of heating and thermally decomposing the waste to be converted into residue at a temperature of 500 to 1000 °C.
  • the waste dried by removing its moisture is controlled to have a temperature within a range of 500 to 1000°C, 500°C, which is , at least, required for thermally decompose combustible matter in the waste, is obtained and the residue (ash) is hardly softened (hardly start partially melting) under temperature lower than 1000°C.
  • the high-temperature gas generated inside the melting furnace chamber is very high, for example, around 1650°C, but the temperature of the high-temperature gas is reduced to 1000 to 1300°C, therefore, a quality of the refractory bonded to the inner wall of the gas feed pipe, the duct, or the header located in the feed path is well kept, and life of the refractory is extended.
  • the gasifying furnace body may be provided with an inlet of incombustible substances such as ash or sludge under an intermediate portion in a vertical direction of the gasifying furnace body and an extruding mechanism of a screw type, a rotating vane type, or a pusher type, or an injecting mechanism using a carrier gas in the vicinity of the inlet.
  • incombustible substances such as ash or sludge
  • the incombustible substances such as ash or polluted sludge are fed into the waste layer in an intermediate portion of the furnace by the feeding mechanism or the gas injecting mechanism using the carrier gas, and the waste deposited above the feeding extrusion position serves as a filter.
  • This enables the ash to be efficiently heated by the high-temperature gas fed into the furnace body without flying out with an effluent gas.
  • various types of wastes can be efficiently treated.
  • the melting chamber furnace may be provided with a feeding port through which incombustible substances are fed independently or together with fuel and an oxygen-containing gas.
  • the ash is directly introduced into the melting chamber furnace to be melted together with the residue and converted into slag.
  • the waste gasification-melting furnace may comprise a hot cyclone provided in a high-temperature gas feed path from the melting chamber furnace to the gasifying furnace body, the cyclone being provided with a supplying port of incombustible substances such as ash or sludge in an inlet portion or inside thereof, wherein a feed path of substances collected by the cyclone extends from the cyclone to the melting chamber furnace after being heated.
  • the waste gasification-melting furnace In the waste gasification-melting furnace according to Claim 10, after the ash or sludge fed into the hot cyclone contacts the high-temperature gas and is instantaneously heated, they are taken into the melting chamber furnace and efficiently melted, while the high-temperature gas inside the hot cyclone, whose temperature is lowered because a part of sensible heat of the gas is transferred to the ash or sludge, and in this state, the gas with a reduced temperature is fed to the furnace body. Therefore, the feed pipe or the header is hardly damaged, and damage to the refractory inside the furnace body is prevented.
  • the waste gasification-melting furnace may be equipped with an industrial television camera, a microwave measuring device or a radiation ray type measuring device as a level measuring device for keeping a residue layer resulting from thermal decomposition being heated and melted by the heating and melting burner at a proper melting flow rate or level.
  • the residue layer being heated and melted inside the melting chamber furnace by the burner is kept at a proper level by the measurement using the level measuring device, the residue can be stably and properly melted and converted into slag.
  • the television camera allows the damage or the like of the refractory inside the melting chamber furnace to be observed, as well as obtaining information on the quality (viscosity, etc), and quality of the slag. Therefore, an appropriate timing for maintenance can be known.
  • the melting chamber furnace may have an inlet hole of a mud (made of wet refractor powder) spraying device in a wall thereof to allow damaged refractory inside the melting chamber furnace to be repaired from outside.
  • a mud made of wet refractor powder
  • the damage of the refractory wall such as a ceiling portion can be detected, and wet refractory (powder) can be coated by using a gun as the spraying device.
  • the gun is operated for about 20 minutes and is easily handled. Also, time during which operation is stopped for maintenance of the refractory is greatly reduced in contrast with the conventional melting furnace. Consequently, the rate of operation of furnace is improved.
  • the gasifying furnace body may be configured to have an annular space, in which no waste exists, by sharply enlarging or reducing an inner wall of the furnace in comparison with a portion located above in the vicinity of an intermediate portion in a vertical direction of the gasifying furnace body, and the high-temperature gas being fed from the melting chamber furnace to the gasifying furnace body is led into the annular space and then uniformly distributed into the waste layer.
  • the gas header may be provided inside the furnace as part of the furnace body. So, the structure of the equipment is simple and durability of the header is improved. Also, since the gas header is located inside the furnace, thermal loss of the gas is less. Further, the high-temperature gas can be introduced evenly to the waste layer.
  • the melting chamber furnace may be provided with a plurality of gas feeding ports in an inner wall in contact with the residue layer in the melting chamber furnace so as to respectively communicate with the gas feed pipe.
  • the high-temperature gas generated inside the melting chamber furnace is fed into the furnace body not from the space but through the residue layer, the high-temperature gas is utilized for preheating the residue.
  • the speed of the gas flowing into each suction port is made lower. This prevents the residue from flying and mixing into the high-temperature gas.
  • the melting chamber furnace body may be a fluidized bed furnace, a residue resulting from thermal decomposition, which is separated from fluidizing media such as sand circulating inside the furnace body, residue accompanied by a gas generated inside the gasifying furnace body, and dust recovered by the cyclone or the like are fed into the melting chamber furnace.
  • a method of operating the waste gasification-melting furnace according to Claim 16 comprises adjusting a flow rate of oxygen and nitrogen introduced from outside into the gasifying furnace body and a flow rate of a high-temperature gas being fed from the melting chamber furnace into the gasifying furnace body to increase temperature of an exhaust gas discharged from a top portion of the furnace up to 800 to 1100°C by adding an oxygen-containing gas such as air, oxygen or oxygen-enriched air in an air ratio of 0.5 to 2.5 from outside to an upper portion inside the gasifying furnace body, thereby controlling concentration of CO 2 contained in the exhaust gas (gas being derived from the waste layer inside the gasifying furnace body) to be high.
  • an oxygen-containing gas such as air, oxygen or oxygen-enriched air
  • the temperature of the exhaust gas can be increased by increasing the temperature of the residue by increasing oxygen.
  • the temperature of the exhaust gas can be lower than 500°C, the waste does not flame up due to injection of air or oxygen, and therefore, stable gasification is achieved.
  • Most of the gases naturally ignite around 700°C, and it is therefore desirable to set the temperature of the exhaust gas to be lower than 500 °C as an appropriate temperature for partial combustion without flame, taking variation in properties of waste or the like into consideration.
  • the temperature of the gasification gas is set low to reduce the amount of fuel for promoting combustion.
  • the exhaust gas can be re-combusted.
  • the heating value of the partially combusted gas varies depending on the heating value of waste. In view of this, air ratio is increased when the heating value is large.
  • temperature of the partially combusted gas is lowered to 800 to 950 °C. For example, water may be sprayed into the gas to adjust the temperature.
  • combustion is conducted in a combustion region within a range of 700 to 800 °C by injecting oxygen or air from outside in the top portion of the gasification furnace to set the re-combustion temperature to be within a range of 800 to 950°C.
  • oxygen or air from outside in the top portion of the gasification furnace to set the re-combustion temperature to be within a range of 800 to 950°C.
  • the combustion temperature is controlled to be 700 to 800°C in the furnace in advance, adjustment of the subsequent rebuming at a reburning temperature is facilitated.
  • combustible gases such as hydro carbon, carbon monoxide, and hydrogen contained in the gasification gas have a combustion point higher than a natural ignition point and are perfectly combusted easily by adding normal-temperature air or oxygen, a complex structure of the burner becomes unnecessary. Attention should be paid to the direction in which air or oxygen is added so that adhesion or deposit of the flying ash to the furnace wall is easily avoided.
  • the combustion temperature is kept stable. Therefore, CO due to imperfect combustion is reduced, and increase in NOx due to too high a temperature is also reduced.
  • the re-combustion temperature of the exhaust gas is reduced to 850 to 900°C, a low-quality and inexpensive material may be used for pipes of the subsequent boiler or air preheater and dioxin can be reduced.
  • the combustion temperature of the waste layer inside the furnace body is lower than that in the conventional method, but the temperature of the residue generated in the pyrolysis region is slightly higher than that in the conventional method, the amount of LP gas used as a fuel for promoting combustion is reduced and the heating value of the exhaust gas is reduced. Since the amount of combustion air is reduced, the amount of the exhaust gas is correspondingly reduced.
  • the method of operating the waste gasification-melting furnace according to Claim 17 may further comprise conducting part of the high-temperature gas generated inside the melting chamber furnace to a vicinity of an upper surface of the waste layer inside the gasifying furnace body and adding an oxygen-containing gas such as air, oxygen, or oxygen-enriched air, and, mixing oxygen-containing gas with the gas exhausted from the waste layer for combustion, thereby adjusting temperature of the exhaust gas discharged from a top portion of the furnace.
  • an oxygen-containing gas such as air, oxygen, or oxygen-enriched air
  • combustion and operation can start regardless of presence/absence of the waste in the gasification furnace. Since the temperature of the exhaust gas is controlled, feeding waste rate can be applied in a wide range, or variation of the amount or blow-by (partial passing of a large amount of gas through a part of the waste layer) of the exhaust gas can be minimized.
  • the method of operating the waste gasification-melting furnace may further comprise conducting part of a high-temperature gas generated inside the melting chamber furnace to an intermediate portion in a vertical direction of the gasifying furnace body and adding air, oxygen, or oxygen-enriched air to a vicinity of an upper surface of a waste layer inside the gasifying furnace body to combust.
  • the method of operating the waste gasification melting chamber furnace may further comprise conducting part of the high-temperature gas generated inside the melting chamber furnace to plural positions apart in the vertical direction at the intermediate portion in the vertical direction of the gasifying furnace body and adding air, oxygen or oxygen-enriched air to a vicinity of an upper surface of the waste layer inside the gasifying furnace body to combust.
  • the method of operating the waste gasification-melting furnace may further comprise controlling a flow rate of oxygen to be injected into the gasifying furnace body according to a CO/CO 2 ratio in an exhaust gas generated from a waste layer inside the gasifying furnace body.
  • a flow rate of oxygen to be injected into the gasifying furnace body according to a CO/CO 2 ratio in an exhaust gas generated from a waste layer inside the gasifying furnace body it is preferable that the flow rate of entire oxygen to be injected into the gasifying furnace body according to the CO/CO 2 ratio of the exhaust gas generated from the waste layer inside the gasifying furnace body is adjusted so that variation in the CO/CO 2 ratio is minimized.
  • Fig. 1(a) is a central longitudinal sectional view showing a waste gasification-melting furnace according to a first embodiment of the present invention and Fig. 1 (b) is a cross-sectional view along line b - b in Fig. 1(a).
  • a gasification-melting furnace 1 of this embodiment comprises a gasifying furnace body 2 constituted by a longitudinal shaft furnace with refractory (not shown) lined onto an inner wall thereof and a melting chamber furnace 3 adapted to heat and melt residue resulting from pyrolysis which is called char generated finally in the gasifying furnace body 2.
  • the gasifying furnace body 2 is configured such that its upper portion has a diameter gradually decreasing toward its upper end and is provided with an exhaust port 4 of an exhaust gas at its upper end.
  • An end of a duct is connected to the exhaust port 4 and an exhaust gas treating device is connected to its downstream side, although this is not shown.
  • the exhaust gas treating facility is comprised of energy recovery equipment such as a reburning chamber, a heat exchanger such as a boiler, and a steam turbine, and a dust collector, or the like.
  • a waste feeing chute 5 penetrates through a furnace wall 2a in an upper portion of the gasifying furnace body 2.
  • the gasifying furnace body 2 is configured such that its lower portion has a diameter gradually decreasing downwardly and is connected integrally with the melting chamber furnace 3 at a bottom portion under a lower-end opening 2b.
  • the melting chamber furnace 3 is formed by a tubular body with rectangular cross-section that is laterally long.
  • the melting chamber furnace 3 is provided with an upper-end opening 3a communicating with the lower-end opening (discharge port) 2b of the gasifying furnace body 2 and a slag discharge port 6 at a lower end portion of a side wall 3b.
  • the slag discharge port 6 is provided with a dam 6a and slag S overflowing the dam 6a is automatically discharged.
  • the melting chamber furnace 3 is configured to have a lateral length to permit the residue flowing into the melting chamber furnace 3 through the upper-end opening 3a so as to form a sufficient slope of repose angle inclining toward one side (rightward in Fig. 3) and have a space formed above the slope of the residue.
  • a heating and melting burner 7 is installed on the melting chamber furnace 3 such that a part of combustion gas at its tip end is directed toward the slope of the residue.
  • the burner 7 is installed with an angle so that a lower end of flame of the burners 7 is distant 50 to 300 mm from an upper surface of the residue layer, but this is only illustrative.
  • the heating and melting burner 7 uses an inexpensive fuel such as a heavy oil mixed with oxygen, air or oxygen-enriched air. Alternatively, a plasma burner may be used.
  • a gas feeding pipe 8 extends upward from the space inside the melting chamber furnace 3 and is connected to a header duct 9 on the periphery of the lower portion of the gasifying furnace body 2.
  • One ends of gas introducing pipes 10 are connected to the header duct 9 at equal intervals in the circumferential direction thereof and the other ends of the gas introducing pipes 10 penetrate through the furnace wall 2a of the gasifying furnace body 2.
  • the position where a high-temperature gas is introduced into through the gas introducing pipes 10 corresponds to a pyrolysis region Y of the waste A.
  • the high-temperature gas generated inside the melting chamber furnace 3 is led into the pyrolysis region Y while its temperature and flow rate is adjusted so that moisture of the supplied waste A is removed and the supplied waste A is dried under temperature of 300 to 400 °C in a dry region X in an upper portion inside the gasifying furnace body 2 and the waste A is thermally decomposed at a temperature within a range of 500 to 1000°C, preferably at a temperature a little higher than 800°C.
  • the reason why the temperature of the thermal decomposition region Y is controlled to be within a range of 500 to 1000°C is that at lowest 500°C is required to thermally decompose combustible matter in the waste A and the residue (ash) starts to be partially molten at a temperature higher than 1000 °C.
  • the gasification-melting furnace 1 is constituted as described above.
  • the waste A slowly moves downward to the pyrolysis region Y in the lower portion while being dried in the dry region X in the upper portion inside the furnace.
  • the waste A is thermally decomposed and the combustible matter in the waste A is gasified in the pyrolysis region Y.
  • the resulting gas is led from the melting chamber furnace 3 to the gasifying furnace body 2 to be used for drying the waste A in the dry region X together with the high-temperature gas and is thereafter discharged through the exhaust port 4 to be sent a gas treating facility including a power generating equipment or the like.
  • the gas is treated in a bag filter or the like and is then discharged outside.
  • the residue generated in the gasifying furnace body 2 flows into the melting chamber furnace 3, and the surface layer of the slope of the residue layer is sequentially melted by the flame from the heating and melting burner 7 and converted into slag, which is melted together with alumina, silica, and the like contained in the waste A, and is discharged from the slag discharge port 6.
  • the discharged molten slag is abruptly cooled and solidified by water spray-cooling and disposed for land filling or reused as a material for road bed for land filling. It should be appreciated that the residue deposited on the bottom surface inside the melting chamber furnace 3 protect the refractory on the bottom surface.
  • Z represents a heating and melting region where the residue C is deposited.
  • Fig. 2 is a central longitudinal sectional view showing a waste gasification-melting furnace according to a second embodiment of the present invention.
  • a melting furnace 1 - 2 of the second embodiment differs from the melting furnace 1 in that a gas header 11 is provided as part of the gasifying furnace body 2 inside the furnace instead of the header duct 9 provided outside the furnace.
  • the gas header 11 is configured such that the furnace wall 2a of the gasifying furnace body 2 is radially outwardly and circumferentially annularly protruded to have a triangular cross-section, and has an inner annular space in which no waste exists without a waste layer B.
  • the other constitution and function are identical to those of the first embodiment, and therefore, the same components as those in the first embodiment are identified by the same reference numerals and will not be further described.
  • Fig. 3 is a central longitudinal sectional view showing a waste gasification-melting furnace according to a third embodiment of the present invention.
  • a melting furnace 1 - 3 of the third embodiment differs from the melting furnace 1 in that an oxygen introducing pipe 12 is connected to the gas feeding pipe 8 to allow an oxygen-containing gas such as oxygen, air, or oxygen-enriched air to be introduced therethrough.
  • an oxygen introducing pipe 12 is connected to the gas feeding pipe 8 to allow an oxygen-containing gas such as oxygen, air, or oxygen-enriched air to be introduced therethrough.
  • Heat required for melting the residue inside the melting furnace 3 is basically proportional to the amount of the residue led from the gasifying furnace body 2 into the melting chamber furnace 3.
  • the high-temperature gas generated inside the melting chamber furnace 3 is insufficient to completely dry and thermally decompose the waste A.
  • a hydro carbon gas such as CO, H 2 , or CH 4 , rather than tar or oil
  • heat and oxygen need to be added. To this end, it becomes necessary to introduce oxygen into the gasifying furnace body 2.
  • a normal-temperature oxygen-containing gas is introduced through the oxygen introducing pipe 12 serves to lower the temperature of the high-temperature gas being fed into the gasifying furnace body 2.
  • the high-temperature gas generated inside the melting furnace chamber 3 is extremely high, for example, about 1650 °C. If such a high-temperature gas is directly fed into the gasifying furnace body 2, this damages refractory lined on an inner wall of the gas feeding pipe 8, or the header in a feed path of the gas. But, addition of the oxygen-containing gas lowers the temperature of the gas to, for example, 1300°C. Thereby, the damage to the refractory is lessened.
  • the normal-temperature oxygen-containing gas being independently introduced from outside into the gasifying furnace body 2 is less likely to fully react with the waste A, but when the oxygen-containing gas is introduced under a high-temperature condition of , for example, 1300 °C together with the high-temperature gas, the waste A reacts with oxygen and is reliably combusted.
  • Fig. 4 is a central longitudinal sectional view showing a waste gasification-melting furnace according to a fourth embodiment of the present invention.
  • a melting furnace 1 - 4 of the fourth embodiment differs from the melting furnace 1 - 3 in that a screw type feeder 13 is provided just under the openings (discharge ports) 2b, 3a where the gasifying furnace body 2 is connected to the melting chamber furnace 3.
  • the residue generated inside the gasifying furnace body 2 is quantitatively and gradually extruded toward the burner 7 in the melting chamber furnace 3.
  • a main part of the screw shaft 13a (including a screw) has a water-cooled structure for cooling (not shown).
  • the temperature of the residue is relatively low, i.e., 800 to 1000°C or less. Therefore, various types of feeders including pusher-type extruder is applied, as well as the screw-type extruder.
  • an extruder used for a direct reduction iron making furnace of a shaft furnace type, or an iron making furnace of a rotary furnace type may be used.
  • Fig. 5 is a central longitudinal sectional view showing a waste gasification-melting furnace according to a fifth embodiment of the present invention.
  • a melting furnace 1 - 5 of the fifth embodiment differs from the melting furnace 1 - 4 of the fourth embodiment.
  • the high-temperature gas Q generated inside the melting chamber furnace 3 is led into the gasifying furnace body 2 through the residue layer resulting from pyrolysis inside the melting chamber furnace 3 from the openings 2b, 3a connecting with the gasifying furnace body 2, without the use of the gas feeding pipe 8 or the header duct 9.
  • the screw type extruder 13 is illustrated as being located slightly under the openings 2b, 3a, it is more preferable in this embodiment that the extruder 13 is located slightly above the openings 2b, 3a, i.e., on the gasifying furnace body 2 side.
  • a gas header 16 is provided inside the furnace as part of the gasifying furnace body 2.
  • the gas header 16 is configured such that a furnace wall 2a of the gasifying furnace body 2 is radially inwardly and circumferentially annularly protruded to have a triangular cross-section, and has an inner annular space in which no waste exists.
  • the high-temperature gas generated inside the melting chamber furnace 3 is fed into the gasifying furnace body 2 not from the space but through the residue layer resulting from thermal composition.
  • a plurality gas suction ports 17 are provided on the inner wall in contact with the residue layer deposited inside the melting chamber furnace 3 so as to connect with the gas feeding pipe 8.
  • Each of the suction ports 17 is apart about 1000 mm (as represented by L in Fig. 6) from the surface of the slope of the residue layer, and the speed of the gas flowing into each suction port 17 is set very low, for example, 0.1m/sec, for the purpose of preventing the residue from flying and mixing into the high-temperature gas.
  • Fig. 7 is a central longitudinal sectional view showing a waste gasification-melting furnace according to a seventh embodiment of the present invention.
  • a melting furnace 1 - 7 of the seventh embodiment differs from the melting furnace 1 - 4 of the fourth embodiment is that two types of oxygen-containing gases, i.e., oxygen and air, are introduced into the gas feed pipe 8, and a flow rate of oxygen and a flow rate of air are controlled by using controllers 18, 19 and control valves 20, 21 so that measured temperature of the residue in the lower portion inside the furnace body 2 is 800 °C and measured temperature of the high-temperature gas being fed into the gas feeding pipe 8 is 1300°C.
  • the temperature of the high-temperature gas to be fed into the furnace body 2 is adjusted by the flow rate of oxygen and the flow rate of air, and the temperature of the residue is adjusted by a ratio between oxygen and air.
  • the fuel being fed by the burner 7 is increased and the amount of air and the amount of oxygen being fed into the melting chamber furnace 3 are increased.
  • oxygen and air may be introduced through the burner 7.
  • Fig. 8 is a central longitudinal sectional view showing a waste gasification-melting furnace according to an eighth embodiment of the present invention.
  • a melting furnace 1 - 8 of the eighth embodiment differs from the melting furnace 1 - 4 of the fourth embodiment.
  • ash is charged from outside into the furnace body 2.
  • an ash charging chute 22 is provided at a position slightly above the high-temperature gas introducing port of the gasifying furnace body 2, and a screw feeder 23 is provided with an upper end portion of the ash charging chute 22 so that ash C is charged into the furnace body 2 from outside and treated in the furnace.
  • the ash C does not fly with gas because the waste A deposited above the position from where the ash is charged serves as a kind of filter in this embodiment, although upon supplying the ash C into the upper portion of the gasifying furnace body 2, the ash C flies away with the flow of the exhaust gas Q.
  • the other constitution and function are identical to those of the fourth embodiment, and therefore, the same components as those in the above embodiments are identified by the same reference numerals and will not be further described.
  • Fig. 9 is a central longitudinal sectional view showing a waste gasification-melting furnace according to a ninth embodiment of the present invention.
  • a melting furnace 1 - 9 of the ninth embodiment differs from the melting furnace 1 - 4 of the fourth embodiment.
  • a cyclone type suspended preheater 24 is provided in the gas feeding pipe 8 and an ash supplying port 25 is provided upstream of the cyclone type suspended preheater 24.
  • the high-temperature gas Q being fed from the melting chamber furnace 3 into the gasifying furnace body 2 is led into the cyclone type suspended preheater 24, while the ash being supplied from the supplying port 25 into the gas feeding pipe 8 is instantaneously heated by being mixed with the high-temperature gas flowing into the cyclone suspended preheater 24 and falls into the melting chamber furnace 3 to be melted. Meanwhile, temperature of the high-temperature gas Q is reduced to an appropriate value because the gas Q has been used for heating the ash C and is fed into the gasifying furnace body 2.
  • the ash may be supplied from the inside of the cyclone type suspended preheater 24 into the inside of the melting furnace chamber 3 through an introducing port 26 as shown in Fig. 9 or through the burner 7 together with fuel, air, and the like.
  • Fig. 10 is an enlarged central longitudinal sectional view showing another embodiment of a melting chamber furnace.
  • a melting chamber furnace 3' of this embodiment is provided with an insertion hole 28 on a side wall 3c through which a spraying gun 27 for spraying mud made of wet refractory powder E is installed.
  • the gun 27 is installed through the insertion hole 28 to be movable in longitudinal and lateral directions.
  • Measurement instruments such as a television camera (not shown) or a thermometer (not shown) are provided in a space U inside the melting chamber furnace 3', for inspecting the refractory wall such as a ceiling portion, and the sprayed wet refractory powder E is sprayed by using the gun 27.
  • the gun 27 is operated for about 20 minutes, and its operation is easy. With this structure, time for stopping operation to maintenance the refractory is greatly reduced, and operation efficiency of the melting furnace 1 is improved.
  • Fig. 11 is a central longitudinal sectional view showing a waste gasification-melting furnace according to a tenth embodiment of the present invention.
  • a melting furnace 1 - 10 of this embodiment differs from each of the above embodiments as follows.
  • the melting furnace 1 - 10 is configured such that the gasifying furnace body 2 is connected to the melting chamber furnace 3 through the connecting openings 2b, 3a which are equal in diameter to the gasifying furnace body 2 and a side wall 3d (left in Fig. 11) of the melting chamber furnace 3 is configured to have a slope near a repose angle of the residue C.
  • a steel-made slate belt conveyor 29 (with bars) as a heat-resistant carrying device is mounted along the slope 3d.
  • a slag reservoir 30 is installed under a slag discharge port 6 to open upward.
  • a steel-made conveyor 31 is installed inside the slag reservoir 30 to allow the cooled molten matter such as the slag to be continuously carried out.
  • Three burners 7 are installed in the space inside the melting chamber furnace 3 and an LP gas or an oil is injected as oxygen-enriched air and a fuel for promoting combustion from each of the burners 7.
  • a furnace wall 1a in an intermediate portion (dry region X) and a lower portion (thermal decomposition region Y) in the vertical direction of the gasifying furnace body 2 is radially outwardly and circumferentially annularly protruded to have a triangle cross-section, and an annual space, in which no waste exists, is formed above the slope of the waste A with a repose angle as upper and lower gas headers 32, 33.
  • Pipes 34, 35 branching from the gas feeding pipe 8 are connected to the upper and lower gas headers 32, 33, respectively, and a pipe 36 branching from the gas feeding pipe 8 is connected to a top space portion T inside the furnace body 2.
  • Dampers 37, 38, 39 are internally provided in the branching pipes 34, 35, 36, respectively.
  • Introducing pipes 40, 41, 42 for introducing oxygen-containing gas such as oxygen or nitrogen are connected to the top space portion T and the gas headers 32, 33, and valves 43, 44, 45 are provided in the introducing pipes 40, 41, 42, respectively.
  • a supplying port 46 of the waste A opens in the upper furnace wall 2a of the furnace body 2 and a pusher 48 provided with a feeding hopper 47 of the waste A is provided continuously with the supplying port 46.
  • the other constitution and function are identical to those of the first embodiment, and therefore, the same components as those in the first embodiment are identified by the same reference numerals and will not be further described.
  • a rotary kiln may be used instead of the shaft furnace or the fluidized bed furnace.
  • the melting furnace 1 - 10 constituted above is operated according to the subsequent procedure.
  • the melting method (operating method) of this embodiment will be described with reference to the melting method (hereinafter referred to as the conventional method) using the conventional melting furnace (Japanese Laid-Open Patent Application Publication No. Hei. 11 - 132432, hereinafter referred to as the conventional furnace).
  • the exhaust gas derived from the furnace is produced into hydrogen and carbon monoxide.
  • the LP gas used as the fuel for promoting combustion occupies about 20% of the total heating value of the waste A.
  • the percentage of CO 2 in the composition of the exhaust gas is greater than that of the conventional furnace. This is because combustion temperature of the waste layer B inside the furnace body 2 is set lower than that in the conventional method.
  • the high-temperature gas Q generated in the melting chamber furnace 3 is led into the top space portion T and the gas headers 32, 33, together with the oxygen-containing gas.
  • the gas Q reacts with the waste layer B inside the furnace body 2 and is combusted at a temperature lower than that in the conventional method. But, since temperature of the residue generated in the pyrolysis region Y is slightly higher than that in the conventional method, the amount of LP gas or oil used as the fuel for promoting combustion is reduced, and the heating value of the exhaust gas is reduced.
  • the exhaust gas containing CO 2 with a percentage higher than that in the conventional method is generated.
  • the temperature required for melting the residue C is 1650°C that is equal to that in the conventional method.
  • the amount of heat generated per unit of the waste A is equal in both methods, while LHV (lower heating value) of the exhaust gas is greater in the conventional method than in the operating method of this embodiment. Because reduction of hydrogen due to reduction of the LP gas used as the fuel for promoting combustion regardless of equal amount of carbon contained in the exhaust gas, the gas volume is greater in the conventional method than in the operating method of this embodiment.
  • the dampers 37, 38 adjust the amount of the high-temperature gas Q being fed into the gas headers 32, 33 so that concentration of carbon dioxide contained in the exhaust gas G is kept constant, and the amount of oxygen-containing gas from the introducing pipes 41, 42 is set so that the drying region X and the pyrolysis region Y have desired temperatures. By introducing the oxygen-containing gas into the furnace body 2, the amount of carbon dioxide is increased.
  • the high-temperature gas Q and the oxygen-containing gas are led into the top space portion T from the branch pipe 36 and from the introducing pipe 40, respectively, and mixed.
  • variation in the amount of supplied waste A within a wide range can be dealt with, or fluctuation in the quality or blow-by of the exhaust gas G is minimized.
  • combustion is started and the furnace is operated regardless of presence/absence of the waste A.
  • the waste gasification-melting furnace and the method of operating the furnace offers advantages described below.
  • the present invention is constituted as described above, and is suitable as a waste gasification-melting furnace that has high-heat efficiency and is stable, comprising an integrated melting furnace and ash melting furnace, capable of melting char generated in the melting furnace in the ash melting furnace, and heating and thermally decomposing the waste by leading a high-temperature combustion gas generated in the ash melting furnace into the melting furnace.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Processing Of Solid Wastes (AREA)
  • Cyclones (AREA)
  • Treatment Of Sludge (AREA)
EP01961244A 2000-09-05 2001-08-31 Four de fusion a gazeification de dechets et procede de fonctionnement de ce four de fusion Withdrawn EP1347236A4 (fr)

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JP2000268857 2000-09-05
JP2000268857A JP2002081624A (ja) 2000-09-05 2000-09-05 廃棄物ガス化溶融炉と同溶融炉の操業方法
PCT/JP2001/007523 WO2002021047A1 (fr) 2000-09-05 2001-08-31 Four de fusion a gazeification de dechets et procede de fonctionnement de ce four de fusion

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EP1593731A3 (fr) * 2004-04-09 2006-04-26 Hyun Yong Kim Gazogène à haute température
US7556659B2 (en) 2004-04-09 2009-07-07 Hyun Yong Kim High temperature reformer
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WO2014140551A1 (fr) * 2013-03-11 2014-09-18 Envirofusion Ltd Réacteur de traitement de matière première
EP2971960A1 (fr) * 2013-03-11 2016-01-20 Envirofusion Ltd Réacteur de traitement de matière première
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EP3950606A1 (fr) * 2020-08-07 2022-02-09 HBI S.r.l. Procédé et installation de traitement de biomasse

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AU2001282571A1 (en) 2002-03-22

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