JP2000111015A - Method and facility for waste melting treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to raise the calorific value of a refined combustible gas by effectively utilizing part of the combustible gas recovered and refined after a top waste gas of a shaft type direct melting furnace is subjected to gas- reforming. SOLUTION: In a waste melting treatment method wherein waste 2, coke 3 and limestone 4 are charged into a shaft type direct melting furnace 10 and oxygen is blown for drying thermal decomposition, combustion and melting, a top waste gas 12 of the shaft type direct melting furnace 10 is separated into a fly ash-containing char 25 and a waste gas 26, and the separated fly ash containing char 25 is gasified and melted in a char gasifying-melting furnace 28 and a char-gasified gas 30 thus produced is reformed together with the waste gas 26 in a gasification reforming furnace 31 so as to recover a crude combustible gas 32, which is then refined, and part 36a of a refined combustible gas 36 thus obtained is blown into the shaft type direct melting furnace 10 so as to raise the calorific value of the refined combustible gas 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste melting treatment method and a treatment facility for treating waste such as general waste and industrial waste in a shaft furnace type direct melting furnace.

[0002]

2. Description of the Related Art As one of the disposal methods of general waste, industrial waste, etc., waste is charged from the top of a shaft furnace type direct melting furnace, and dried / preheated, pyrolyzed, burned, and decomposed. There is a waste melting treatment method in which non-combustible substances in waste are melted as slag and metal from the lower part of the furnace, and combustibles are extracted as gas from the furnace top. In this treatment method, the waste can be treated collectively by the gasification function and the high-temperature ash melting function.

[0003] Waste treatment processes using a shaft furnace type direct melting furnace are roughly classified into the following two types based on the mode of recovery and utilization of thermal energy possessed by the waste. One is a conventional waste heat recovery type in which the exhaust gas from the top of a shaft furnace type direct melting furnace is completely burned, and the exhaust gas sensible heat is recovered by a boiler and used in the form of electric power or thermal energy by steam power generation. ,
The other one has a different concept from the former, which is a combustible gas recovery type that converts the furnace top exhaust gas into flammable gas and recovers it. In addition to this, it is a process that aims to develop diversified use for chemical industry raw materials.

FIG. 2 is a process flow explanatory diagram showing an example of a conventional waste heat recovery and utilization type facility. In the shaft furnace type direct melting furnace 10, waste 2, coke 3, limestone 4, circulating fly ash 5 and the like are charged as furnace top charge 1 from the furnace upper part. The circulating fly ash 5 is fly ash 5 collected from the downstream combustion chamber 14, the waste heat recovery boiler 16, the exhaust gas temperature controller 19 and the like. On the other hand, oxygen-enriched air obtained by mixing oxygen 9 and air 7 from the oxygen generator 8 is blown from the lower part of the furnace alone, or air 6 is blown in parallel above it. Single or parallel selection mainly depends on the nature of the treated waste (moisture,
Ash, calorific value, etc.) and treatment scale.

[0005] In the lower part of the furnace, oxygen in the blown gas and coke, a part of the pyrolysis residue described later, and the like react to form a high-temperature field, and the generated high-temperature gas rises in the furnace to charge waste and other materials. The material is dried and preheated as it descends in the furnace, and pyrolyzed. Combustible materials in waste produce gas (mixture of tar, carbonized gas, carbonized moisture, etc.) and solid residue (char containing fly ash) by pyrolysis, and a part of pyrolysis gas and pyrolysis residue from bottom of furnace Is discharged from the furnace top together with the ascending gas and the moisture evaporated at the furnace upper part as an exhaust gas 12. The remainder of the pyrolysis residue descends in the furnace, burns in the high-temperature field, gasifies and rises by the solution reaction (C + CO ₂ = 2CO), etc., but the ash content of the reaction residue, ash such as coke and limestone, and waste Is melted and fluidized by the heat generated in the lower part of the furnace, and is discharged as a molten material (slag, metal) 11.
Used as a resource.

Exhaust gas 12 discharged from the furnace top is introduced into a combustion chamber 14 and is completely burned at 850 ° C. or higher, usually by combustion air 13 to be blown. Next, the high temperature flue gas 15 is usually heated to 200 ° C. by the waste heat recovery boiler 16.
The outlet gas is cooled to about the outlet temperature, and the sensible heat of the exhaust gas between the inlet and outlet temperatures is recovered as steam 17. Most of the recovered steam is converted into electric energy by ancillary equipment of the turbine / power generation equipment 18, and a part is used as direct thermal energy.

The exhaust gas from the waste heat recovery boiler 16 is cooled to an appropriate temperature of about 170 ° C. by an exhaust gas temperature controller 19 such as water spray cooling, and is cooled by a dust collector 20 such as a bag filter. After removing harmful gases and the like, the exhaust gas is purified and discharged to the atmosphere from the chimney 23. Further, the collected fly ash in the dust collector 20 is rendered harmless by the fly ash detoxification treatment equipment 21, and then is disposed as landfill ash 22.

FIG. 3 is an explanatory diagram of a process flow showing an example of a conventional flammable gas recovery type facility. The shaft furnace type direct melting furnace 10 is the same as the above except that the waste plastic 27 is blown into a high temperature region at the lower part of the furnace if necessary, and the description is omitted.

The furnace top exhaust gas 12 enters a solid-gas separator 24 such as a cyclone, and the fly ash-containing char 25 is separated from the exhaust gas 12. The separated fly ash-containing char 25 and the discharged ash 5 collected from a gas quenching device 33, a gas purifying device 34, and the like, which will be described later, are introduced into a char gasification and melting furnace 28, and the oxygen generator 8
And reacts with oxygen 9 supplied from the furnace to form a high-temperature field of usually 1300 ° C. or higher by utilizing the heat generated by the char. Due to this high temperature, the ash is melted and fluidized and discharged as a molten slag 29, which makes it possible to reduce the volume of fly ash and to supplement heavy metal in the ash to the slag. At the same time, the char is converted into a gas containing CO and H ₂ , and the generated high-temperature char gasification gas 30 and some fly ash flow out and are introduced into the connected gasification and reforming furnace 31.

The gasification and reforming furnace 31 includes the solid-gas separator 2
Exhaust gas 26 that has passed through 4 is introduced, and both gases react with oxygen 9 supplied from oxygen generator 8 to form a temperature field of usually 800 ° C. or higher. to reform the gas containing ₂ minutes H.
That is, all combustibles in the waste discharged from the shaft furnace type direct melting furnace 10 by the gasification reforming furnace 31 are finally converted into the crude combustible gas 32 partially containing fly ash.

The generated crude combustible gas 32 is cooled in a short time to usually 100 ° C. or less in a gas quenching device 33 such as water spray cooling to suppress re-synthesis of dioxin, and fly ash is removed by a gas purification device 34 such as washing. Heavy metals, harmful gas components, excess moisture, and the like are removed, purified into a highly clean combustible gas 36, and stored in a gas holder 35. The purified combustible gas 36 is efficiently converted into electric energy by a power generation facility 37 such as a gas engine and used, and clean exhaust gas is released from the chimney 23 to the atmosphere. In addition, purified combustible gas 3
6 is also expected to be applied to chemical recycling as a raw material for chemical industry such as methanol synthesis. If necessary, the waste plastic 27 can be blown into the char gasification melting furnace 28, the gasification reforming furnace 31, and the like, and can be used as an auxiliary fuel.

[0012]

SUMMARY OF THE INVENTION Waste treatment techniques are:
Against the background of recent social demands, "improvement of environmental performance symbolized by dioxin reduction", "fly ash treatment with less environmental pollution", "resource recycling type treatment", "advanced recovery and use of waste energy", etc. Must be able to respond to the various issues.

[0013] From this viewpoint, the above-mentioned conventional waste heat recovery and utilization process has a low energy recovery and utilization efficiency due to the steam recovery and utilization system of the sensible heat of exhaust gas. There are problems such as reduction.

On the other hand, the combustible gas recovery and utilization process is a process excellent in responding to the above-mentioned problems, but is inactive because a large amount of air is supplied to the conventional shaft furnace type direct melting furnace. There is a problem in that the nitrogen content dilutes the furnace top exhaust gas and limits the calories (quality) of the purified combustible gas recovered as a product. Since gas calories have an effect on the power generation efficiency when using gas power generation, and the use efficiency of energy such as added value when using chemical industrial raw materials, it is desired to increase the calories of purified combustible gas.

According to the present invention, the function as a heat source for drying / preheating and pyrolysis of the charge held by nitrogen in the air supplied to the shaft furnace type direct melting furnace as described above is newly added. Instead of external energy, the energy of the waste itself is retained and replaced by a gas with a low inert content that has been recovered and manufactured, thereby increasing gas calories, which is an issue.

That is, according to the present invention, a part of the combustible gas recovered and refined by gasifying and reforming the top exhaust gas of a shaft furnace type direct melting furnace is effectively used for the shaft furnace type direct melting furnace, and the refining is performed. Another object of the present invention is to provide a waste melting treatment method and a treatment facility for increasing the calories of combustible gas.

[0017]

The waste treatment method of the present invention comprises the steps of charging waste, coke, and limestone into a shaft furnace type direct melting furnace, blowing oxygen, drying, pyrolyzing, burning, and so on.
In the waste melting method for melting, the top exhaust gas of the shaft furnace type direct melting furnace is separated into fly ash-containing char and exhaust gas, and the separated fly ash-containing char is gasified and melted in a char gasification melting furnace to produce Reforming the char gasified gas together with the exhaust gas in a gasification reforming furnace to convert it to a crude combustible gas, and blowing a part of the purified combustible gas obtained by purifying the crude combustible gas into the shaft furnace type direct melting furnace. It is characterized by.

In the above construction, the waste plastic may be blown into at least one of a shaft furnace type direct melting furnace, a char gasification melting furnace or a gasification reforming furnace.

Further, the waste melting treatment equipment of the present invention comprises a shaft furnace type direct melting furnace equipped with a purified combustible gas and an oxygen injection port, and a furnace ash containing exhaust gas from the shaft furnace type direct melting furnace. Solid-gas separator for separating into flue gas, char gasification and melting furnace for gasifying and melting fly ash-containing char separated by the solid-gas separator, gasification for reforming char gasification gas produced in char gasification and melting furnace together with the exhaust gas Reforming furnace,
A cooling / refining device for cooling / refining the reformed crude combustible gas, an exhaust ash supply device for supplying the ash from the cooling / refining device to the char gasification and melting furnace, and a shaft furnace for supplying the purified combustible gas from the cooling / refining device. A refined combustible gas supply device for supplying to the mold direct melting furnace is provided.

[0020] In the above equipment, a waste plastic supply device may be provided in at least one of a shaft furnace type direct melting furnace, a char gasification melting furnace and a gasification reforming furnace.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of a process flow showing an example of equipment of a waste melting treatment method of the present invention. In the shaft furnace type direct melting furnace 10, waste 2, coke 3 and limestone 4 are charged as furnace top charge 1 from the furnace upper part. On the other hand, waste plastics 27 are blown in from the lower part of the furnace by air flow transport of nitrogen or the like via a hopper, if necessary. Further, the oxygen 9 from the oxygen generator 8 and the purified combustible gas 36 described later are blown into the furnace lower part alone or in parallel above it. The choice between single and parallel is determined mainly in consideration of the properties of the treated waste (moisture, ash, calorific value, etc.) and the treatment scale, as well as the balance of the waste treatment process in the furnace described later.

In the lower part of the furnace, injected oxygen and purified combustible gas,
Coke, some pyrolysis residues described later, waste plastics, etc. react to form a high-temperature field at the bottom of the furnace, and the generated high-temperature gas rises in the furnace, causing waste and other charges to fall with the furnace. Dry, preheat and pyrolyze. The blown purified combustible gas has good flammability and reacts with oxygen prior to pyrolysis residue and coke to form the high-temperature gas described above. In addition, waste plastics are similarly gasified to form high-temperature gas. Combustible materials in waste produce gas (mixture of tar, carbonized gas, carbonized moisture, etc.) and solid residue (char containing fly ash) by pyrolysis, and a part of pyrolysis gas and pyrolysis residue from bottom of furnace Is discharged from the furnace top together with the ascending gas and the moisture evaporated at the furnace upper part as an exhaust gas 12. The remainder of the pyrolysis residue is burned in the high-temperature field and a solution reaction (C + CO
₂ = 2CO) etc., but the ash contained in the reaction residue, the ash such as coke and limestone, and the incombustibles in the waste are melted and fluidized by the heat generated in the lower part of the furnace to form molten materials (slag, metal) 11. Emitted and used as resources.

The furnace top exhaust gas 12 enters a solid-gas separator 24 such as a cyclone and is separated into fly ash-containing char 25 and exhaust gas 26. Separated fly ash-containing char 25 and discharged ash 5 collected from gas quenching device 33, gas purifying device 34, etc.
Is introduced into a char gasification and melting furnace 28 and partially burned with oxygen 9 supplied from the oxygen generator 8. Further, if necessary, waste plastic 27 is blown. Fly ash containing char 25
The circulating fly ash 5 and the added waste plastic 27 are each transported in a stream by nitrogen or the like via a hopper. The char gasification and melting furnace 28 has both a gasification function and an ash melting function.
The fly ash-containing char 25 and the added waste plastic 27 react under an oxygen partial pressure of a theoretical amount or less to generate heat and form a high-temperature reaction field of usually 1300 ° C. or more. As a result, the char and the plastic mainly generate gas containing CO and H ₂ ,
A portion of fly ash is entrained as high-temperature char gasification gas 30 and introduced into a connected gasification and reforming furnace 31. The ash contained in the char and a part of the circulating fly ash 5 are scattered from the furnace top, but most of the ash is melted and fluidized and flows out as molten slag 29 from below. Due to this high-temperature molten slag,
It is possible to suppress the resynthesis of dioxin and to reduce the volume of fly ash by supplementing the supplied fly ash-containing char 25 and the circulating fly ash 5 with heavy metal components.

If necessary, the char gasification and melting furnace 28
If the waste plastic 27 is supplied into the inside, in addition to increasing the heat of the char gasification gas 30, heat replenishment of the char gasification and melting furnace 28 and heat compensation when the calorific value of the char is reduced are achieved, and the ash melting temperature is stabilized.

The gasification and reforming furnace 31 includes the solid-gas separator 2
Exhaust gas 26 that has passed through 4 is also introduced, and is partially burned with the supply gas 9 from the oxygen generator 8 together with the char gasification gas 30 to generate a crude combustible gas partially containing fly ash. In addition, if necessary, the waste plastic 27 is blown through a hopper by air current transport such as nitrogen. Gasification reforming furnace 31
Converts all combustibles in the waste charged in the shaft furnace type direct melting furnace 10 into a form of combustible gas, and recovers the energy of the waste as a valuable gas having a wide use and a high use efficiency. Has functions. That is, in the gasification reforming furnace 31, a mixture of the exhaust gas 26 from the shaft furnace type direct melting furnace 10, the char gasification gas 30 containing CO and H ₂ from the char gasification melting furnace 28, the added waste plastic 27, etc. is theoretically used. It reacts under an oxygen partial pressure of less than the amount to generate heat, and usually forms a high-temperature reaction field of 800 ° C. or more. As a result, tar, char, plastic, etc. are reformed into a gas mainly containing CO and H ₂ , and the crude combustible gas 3 partially containing fly ash
It is converted to 2 and discharged. At this time, the retained heat of the inflowing high-temperature char gasification gas 30 effectively functions as a heat supply source of the gasification reforming furnace 31 to form a temperature field.

If the waste plastic 27 is supplied to the gasification and reforming furnace 31 as required, the heat of the gasification and reforming furnace 31 is replenished in addition to the increase of the heat of the crude combustible gas 32.

The generated crude combustible gas 32 is sent to a gas quenching device 33 such as a water spray, and is cooled to a gas purification temperature in a short period of time usually at a temperature of 100 ° C. or less to suppress the resynthesis of dioxin. Further, at this time, the moisture in the crude combustible gas 32 is reduced to a level corresponding to the saturated steam partial pressure at the operating temperature, the calories are increased, and fly ash is also removed. Next, the gas purification device 34
Then, the heavy metal component contained in the crude combustible gas 32, HC
1, gaseous harmful substances such as H ₂ S, SO _X , fly ash, solid particles, excess moisture, etc., acid washing (de-heavy metal), alkali washing (desalting), catalyst (desulfurization), activated carbon (denitration), water Clean or combustible gas 3 by removing to the required cleanliness of the gas destination by washing or filtering (dust removal), supercooling (dehumidification), etc.
Purify to 6. The cooling and refining functions are not inseparable, but may be treated as an integrated gas purifier in terms of equipment. The purified combustible gas 36 finally obtained is stored in the gas holder 35.

The gas holder 35 and the shaft furnace type direct melting furnace 10 are connected by a duct, and a part 36b of the purified combustible gas 36 is introduced into the shaft furnace type direct melting furnace via a blower. The remaining purified combustible gas 36a is sent to a power generation facility 37 such as a gas engine, and is efficiently converted into electric energy for use. Further, the purified combustible gas 36a can be used as a raw material for chemical industry such as methanol synthesis.

The use of the crude combustible gas 32 in the shaft furnace type direct melting furnace 10 is based on the fact that the crude combustible gas 32 has a high moisture content and the inside of the shaft furnace type direct melting furnace 10 is cooled to maintain a necessary heat level. Harmful substances such as fly ash and HCl contained in the crude combustible gas 32 adhere in the circulation route,
It is not preferable because it causes problems such as corrosion, accumulation and concentration.

The position at which the purified combustible gas 36b is blown into the shaft furnace type direct melting furnace 10 is determined in consideration of the properties and the scale of the waste and the waste treatment process in the furnace. As mentioned above, waste is processed through drying / preheating, pyrolysis, combustion / melting processes. The main points of stable processing are (1) whether sufficient hot gas can be supplied for drying / preheating. (2) How to form a temperature range in which the solid residue generated by thermal decomposition can be consumed by a solution reaction (C + CO ₂ = 2CO); (3) Further, the ash falling to the lower part of the furnace is melted, fluidized, and discharged. Whether the heat source is sufficient. In addition, the actual properties (moisture, ash content, calorific value, etc.) of the treated waste are not stable, and large fluctuations are used as triggers to disturb the balance of the above-mentioned treatment process and to reduce the drying and melting functions. In some cases, stagnation of processing may be caused. Therefore, to stabilize the process, it is basically important to secure the balance of the above process.

From the above viewpoint, the blowing position is basically at the upper part of the coke bed formed at the lower part of the furnace, and is blown to the upper part as necessary. That is, when the purified combustible gas 36b is blown directly above the coke bed,
Along with the coke combustion, the ash melting / fluidizing heat source can be stably secured, and a high temperature field can be realized. When blown into the upper part of the coke bed, thermal decomposition,
An activation temperature zone for the generated solid residue solution can be easily formed, and heat absorption for solution reaction, water gas reaction, etc., and heat source for drying and preheating of the furnace upper part can be stably secured.

The amount of the purified combustible gas 36b to be blown is determined in consideration of the material and heat balance of the shaft furnace type direct melting furnace 10. That is, given the properties of waste (water, ash, calorific value, etc.), treatment amount, supply oxygen amount set according to coke supply amount, etc., the purified combustible gas amount to be supplied, It is calculated to satisfy the balance of the shaft furnace type direct melting furnace. Further, it is determined so that the supplied oxygen amount is small and the gas utilization rate for the originally intended power generation or the like becomes high.

Since the purified combustible gas 36b supplied to the lower part of the shaft furnace type direct melting furnace 10 has high flammability and burns in preference to the solid residue, the combustion amount of the solid residue under the set supply oxygen is relatively small. And the solution volume increases,
This leads to increased calorie of furnace exhaust gas. However, with the increase in the supply of purified combustible gas, the changes in the amount of combustion and the amount of solution slowed down, and the calorific value of the furnace top exhaust gas showed a tendency to saturate. Insufficient preheating is caused, and it becomes difficult to maintain the balance of the treatment process. On the other hand, the decrease in the amount of combustible gas supplied and purified has the same situation as the above-mentioned excessive supply, accompanied by a decrease in calorie exhaust gas from the furnace top and the amount of generated gas in the lower part. , Stagnant processing, etc.

That is, the supply amount of the purified combustible gas 36b is based on the premise that the in-furnace process related to the stabilization process is maintained.
It is set to an appropriate area calculated from the material and heat balance of the corresponding shaft furnace type direct melting furnace, and of course, it is set in consideration of economic efficiency such as oxygen consumption rate and gas utilization rate for power generation etc. Select. In actual operation, the amount of purified combustible gas is adjusted while monitoring detected data such as the properties of the treated waste, the temperature inside the furnace, the pressure distribution, and the furnace top exhaust gas analysis value.

Further, if necessary, the waste plastic 27 is blown into the shaft furnace type direct melting furnace 10, the char gasification melting furnace 28, the gasification reforming furnace 31 or the like, so that the waste plastic is gasified, thereby improving the calorie of the purified combustible gas. Heat supply of each furnace, stabilization of the ash melting temperature of the char gasification melting furnace, and the like can be performed.

[0036]

The following table shows the conditions and results of the embodiment of the present invention using the equipment shown in FIG. A comparative example using the equipment shown in FIG. 2 is also shown as a reference example.

Table 1 shows a comparison between the embodiment of the present invention and the reference example.

[0038]

[Table 1] Table 2 shows the results of Examples of the present invention in which waste plastics composed of polyethylene, polystyrene, and polyvinyl chloride were blown into a char gasification melting furnace in an amount equivalent to 10% of the waste treatment amount (100 Kg / garbage ton).

[0039]

[Table 2] As is clear from the results in Table 1, a part of the purified combustible gas obtained by gas-converting the combustible waste material is replaced with conventional air and recycled to the shaft furnace type direct melting furnace, thereby achieving the final 1Nm of purified combustible gas calories obtained
Approximately 610 Kcal increase per ³ to improve the utility value as a raw material for chemical recycling such as methanol synthesis in addition to fuel gas for gas power generation, and to improve cold gas efficiency (=
The energy recovery ratio (total calorific value of purified combustible gas / total calorific value of the charge) was also improved by about 10% or more, which proved to be an effective process from the viewpoint of effective use of resources.

As can be seen from the results in Table 2, the calorie of the purified combustible gas is further increased by about 230 Kcal and the cold gas efficiency is increased by about 3% by adding waste plastic, and the added value of the purified combustible gas is further improved. It has been found that the process is effective as a means for treating waste plastic, as well as contributing.

[0041]

The present invention circulates and supplies a part of the combustible gas obtained by gasifying, reforming, recovering and purifying the top exhaust gas generated in the shaft furnace type direct melting furnace to the shaft furnace type direct melting furnace. By doing so, it is possible to increase the calories of the purified combustible gas obtained from the waste and improve the added value, and it is possible to efficiently recover the heat energy of the waste as electric energy or raw material gas for the chemical industry.

Further, according to the present invention, a heat source, which is required in the lower part of the shaft furnace type direct melting furnace and depends on the quality of the waste, such as the water content of the waste, can be compensated and controlled by the heat generated from the purified combustible gas. In addition, the shaft furnace type direct melting furnace has improved operational flexibility against fluctuations in waste quality, stability of treatment, and the like.

Further, by appropriately blowing the waste plastic into a char gasification melting furnace and the like, the waste plastic can be effectively used, and this contributes to the reduction of other fuels as an auxiliary fuel.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a process flow of a waste melting treatment method of the present invention.

FIG. 2 is an explanatory diagram of a process flow of a conventional waste melting treatment method.

FIG. 3 is an explanatory diagram of another process flow of a conventional waste melting treatment method.

[Explanation of symbols]

1: Furnace top charge 2: Waste 3:
Coke 4: Limestone 5: Circulated fly ash 6:
Air 7: Air 8: Oxygen generator 9:
Oxygen 10: Shaft furnace direct melting furnace 1
1: melt (slag, metal) 12: furnace top exhaust gas 13: combustion air 1
4: Combustion chamber 15: Combustion exhaust gas 16: Waste heat recovery boiler 1
7: Steam 18: Turbine and power generation equipment 1
9: Exhaust gas temperature controller 20: Dust collector 2
1: Fly ash detoxification treatment equipment 22: Export ash 23: Chimney 2
4: Solid-gas separator 25: Fly ash containing char 26: Exhaust gas 2
7: Waste plastic 28: Char gasification and melting furnace 2
9: Melt (slag) 30: Char gasification gas 3
1: gasification reforming furnace 32: crude combustible gas 33: gas quenching device 3
4: Gas purification device 35: Gas holder 36, 36a, 36
b: Refined combustible gas 37: Gas power generation equipment

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F23G 5/16 ZAB F23G 7/00 ZABZ 7/00 ZAB 7/12 ZABZ 7/12 ZAB B09B 3/00 303K (72) Inventor Sou Ono 46-59 Nakahara, Tobata-ku, Kitakyushu Nippon Steel Corporation Engineering Business Headquarters (72) Inventor Hideo Nishimura 20-1 Shintomi, Futtsu City Nippon Steel Corporation Technology Development Headquarters (72) Inventor Takafumi Kawamura 20-1 Shintomi, Futtsu Nippon Steel Corporation Technology Development Division F term (reference) 3K061 AA16 AA24 AB02 AB03 AC03 AC13 AC19 AC20 BA05 BA10 CA08 DA18 FA21 3K078 AA05 AA10 BA03 BA22 CA02 CA06 CA24

Claims (4)

[Claims] 1. A waste melting method in which waste, coke, and limestone are charged into a shaft furnace type direct melting furnace, oxygen is blown, and drying, pyrolysis, combustion, and melting are performed. Furnace top exhaust gas is separated into fly ash-containing char and exhaust gas, and the separated fly ash-containing char is gasified and melted in a char gasification and melting furnace, and the generated char gasified gas together with the exhaust gas in a gasification reforming furnace. A waste melting treatment method, comprising reforming and converting a crude combustible gas into a crude combustible gas, and blowing a part of the purified combustible gas obtained by purifying the crude combustible gas into the shaft furnace type direct melting furnace. 2. The waste melting treatment method according to claim 1, wherein the waste plastic is blown into at least one of a shaft furnace type direct melting furnace, a char gasification melting furnace or a gasification reforming furnace. 3. A shaft furnace type direct melting furnace provided with an inlet for purified combustible gas and oxygen, a solid-gas separator for separating the furnace top exhaust gas of the shaft furnace type direct melting furnace into fly ash-containing char and exhaust gas, Char gasification and melting furnace for gasifying and melting the fly ash-containing char separated by the solid-gas separator, a gasification and reforming furnace for reforming the char gasification gas produced by the char gasification and melting furnace together with the exhaust gas, and a reformed crude combustible gas Cooling and refining equipment for cooling and refining, exhaust ash supply for supplying ash from the cooling and refining equipment to the char gasification and melting furnace, and supplying purified combustible gas from the cooling and refining equipment to the shaft furnace type direct melting furnace A waste melting treatment facility comprising a purified combustible gas supply device. 4. The waste melting treatment equipment according to claim 3, wherein a waste plastic supply device is provided in at least one of a shaft furnace type direct melting furnace, a char gasification melting furnace, and a gasification reforming furnace.