JP2000074335A - Method and apparatus for treating waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To scarcely elute a heavy metal by melting an incombustible material and ash content to reduce in volume and renewing resources, in the case of treating waste containing combustible material and incombustible material, heat recovering, enhancing a generating efficiency, and volume reducing leaping flame containing the heavy metal. SOLUTION: Waste is treated in a shaft kiln type direct melting furnace 1 to generate thermally decomposed char and thermally decomposed gas, an incombustible material is melted, the char is partly or completely burned by oxygen, oxygen-enriched air or air and gasified in a char melting furnace 3 provided at a rear stage of the direct melting furnace, and ash content in the char is melted. A baking furnace 4 is provided together with the char melting furnace, completely burned with combustible gas from the melting furnace, sensible heat of the combustion exhaust gas is recovered by a boiler, and sent to a generating means. Leaping flames from the char melting furnace and the baking furnace are returned to the furnace 3 as needed, and melted to slag. Waste plastic is diffused to at least one of the direct melting furnace, the char melting furnace and the baking furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a facility for treating refuse such as municipal waste and industrial waste, which are composed of combustible and non-combustible substances.

[0002]

2. Description of the Related Art Conventionally, waste treatment methods in Japan have been carried out at 800 ° C. to 900 ° C. using a stoker type treatment furnace or a fluidized bed treatment furnace.
After the treatment, the method of landfilling treated ash has been used.
There is a demand for reducing the volume and recycling of treated ash. Therefore,
Plasma arc furnaces and burner combustion furnaces have been installed at the subsequent stage of the existing processing furnaces, and the processing ash processing methods that melt the generated processing ash and turn it into slag have been developed. There is a disadvantage that a large amount of external energy is required.

[0003] As a waste disposal method that solves this drawback, for example, “Environmental Facility” No. The waste is placed in a pyrolysis furnace at 400 ° C.
Pyrolyze at a low temperature of about 600 ° C to convert organic matter in waste into pyrolysis char and pyrolysis gas. Separate incombustibles such as empty cans with a separation device. Completely combusts at a high temperature of about 1300 ° C to 1400 ° C using air to melt the ash contained in the pyrolysis char. The molten ash is separated from the exhaust gas, cooled and solidified to form granulated slag. Gasification and melting systems have been proposed.
The gasification melting method uses ash contained in pyrolysis char or pyrolysis gas as fuel to melt ash by self-heating.
External energy input can be significantly reduced. Fluid bed and kiln systems have been proposed as thermal decomposition methods. further,
In order to effectively use waste as an energy resource, waste power generation is being introduced.However, a steam turbine that normally collects high-temperature combustion exhaust gas with a boiler and supplies the collected steam to a steam turbine to generate electric power A power generation method is adopted.

Further, as an improved type of the gasification melting method, for example, as described in “Monthly Global Environment”, May 1997, page 43, line 30, trash in a pyrolysis furnace. Of chlorine in pyrolysis gas by fixing chlorine
In the latter stage of the pyrolysis furnace, a melting furnace that completely burns the pyrolysis char with air to melt the ash and a combustion furnace that completely burns the pyrolysis gas with air are provided. Furnace-separated type with the aim of mitigating boiler corrosion by introducing only stable char into the melting furnace to ensure stable operation of the melting furnace and to obtain superheated steam mainly from the combustion furnace exhaust gas containing less HCl. Has also been proposed.

[0005]

However, the above-mentioned prior art has the following problems. The problem of treatment of incombustible materials that are difficult to reuse The gasification and melting system that thermally decomposes waste at a low temperature of about 400 ° C to 600 ° C using a fluidized bed or kiln, Includes items that are difficult to reuse. This incombustible material that is difficult to reuse must be landfilled, and it is difficult to fundamentally solve the problem of landfill disposal. Fly ash treatment problem Fly ash (dust) is contained in the flue gas generated from the melting furnace or combustion furnace, and the fly ash is removed by the dust collector before the flue gas is introduced into the smoke exhaust system. Need to be
When fly ash collected by the dust collector is returned to the melting furnace for volume reduction and melted, heavy metals in the fly ash migrate into the molten slag, making it difficult to reuse the slag. . For this reason, fly ash must be landfilled, but landfills must be disposed of at a managed landfill site because of the elution of heavy metals. There is a problem that it is difficult to secure new land. The problem of waste heat recovery boiler corrosion In order to avoid HCl gas corrosion generated from chlorine in garbage and molten salt corrosion due to alkali metal salts in fly ash, the temperature of the recovered steam in the boiler cannot be raised (400 ° C or less), and power generation The efficiency has to be low (at most about 20%). Even in the gasification and melting system of the melting furnace-combustion furnace separation type, it is difficult to prevent boiler corrosion because corrosive dusts such as alkali metal salts are present in the combustion exhaust gas. In order to raise the temperature of the recovered steam, an expensive material having excellent corrosion resistance is required. Dioxin resynthesis problem Metal chlorides (such as CuCl ₂ ), which are dioxin resynthesis catalysts, are generated from chlorine and metals in garbage, and dioxin is resynthesized when exhaust gas temperature decreases, such as during waste heat recovery in a boiler. There is a risk.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to stably melt incombustibles and ash in a wide range of garbage wastes to reduce the volume and recycle them. Provided are a waste treatment method and a treatment facility capable of effectively preventing corrosion, enabling high-efficiency power generation with recovered energy, enabling safe processing of fly ash, and avoiding resynthesis of dioxin. The purpose is to do.

[0007]

According to a first aspect of the present invention, there is provided a method for treating waste, comprising the steps of: treating waste consisting of combustibles and non-combustibles in a shaft furnace type direct melting furnace; After generating cracked gas and melting the incombustibles and ash, the pyrolysis char is combustible gas with oxygen or oxygen-enriched air in a char melting furnace or completely burned with air and the ash in the char is melted. It is characterized in that the pyrolysis gas is completely burned with air in a combustion furnace, and the sensible heat of the combustion exhaust gas is recovered by a boiler.

[0008] Since the shaft furnace type direct melting furnace melts all incombustibles in the waste, even non-combustible substances such as rubble, which are difficult to reuse in a gasification and melting system in which pyrolysis is performed at a low temperature, are disposed of in landfill. Instead, it can be recyclable slag and metal. The shaft furnace type direct melting furnace has a high gasification rate of combustibles because waste is thermally decomposed at high temperatures. In addition, since it has an ash melting function, most of the ash in the waste becomes molten slag. As a result, the amount of char generated is small (a fraction of that of conventional fluidized-bed or kiln-type pyrolysis furnaces and other waste pyrolysis systems), and the subsequent char melting furnace can be made more compact, maintaining the furnace temperature. Also becomes easier. Further, the sensible heat of the flue gas can be recovered and used for power generation.

According to a second aspect of the present invention, in the above method, a combustible gas obtained by gasification with oxygen or oxygen-enriched air in a char melting furnace or a combustion exhaust gas obtained by completely burning with air is subjected to wet cleaning. It is characterized by doing. In the shaft furnace type direct melting furnace, limestone is added in order to improve the fluidity of the molten slag, but this limestone reacts with corrosive components such as HCl contained in the gas generated by the shaft furnace type direct melting furnace to cause corrosion. The components are separated from the gas and immobilized in the char. HCl and fly ash are removed by wet-cleaning the combustible gas or combustion exhaust gas generated from the char melting furnace, so that dioxin generation is suppressed and boiler corrosion is prevented.

According to a third aspect of the present invention, the second aspect is provided.
In the above method, fly ash collected by a dust removal process of flue gas from a combustion furnace and fly ash collected by wet cleaning of combustible gas or complete flue gas generated from a char melting furnace are introduced into a char melting furnace. And melt processing. As a result, only troublesome fly ash containing heavy metals is converted into molten slag in a separate small char melting furnace,
It is possible to reduce the volume to 2/3 and landfill. In addition, heavy metal is less likely to be eluted by slagging than fly ash.

According to a fourth aspect of the present invention, the second aspect is provided.
In the method, the combustible gas after the wet cleaning is introduced into a combustion furnace. Since the combustible gas after the wet cleaning is clean, it becomes optimal as a fuel in a combustion furnace at a later stage.

Next, in claim 5 of the present invention, claim 1
In any one of the above items 4, the waste plastic is blown into at least one of a shaft furnace type direct melting furnace, a char melting furnace and a combustion furnace. When stably treating waste having a low calorific value, waste plastic can be used as an auxiliary fuel. The furnace into which the waste plastic is charged is preferably a shaft furnace type direct melting furnace, a char melting furnace, or a combustion furnace, or two or more furnaces. Further, when the ash content in the waste is large and the calorific value of the pyrolysis char is low, it is easy to maintain the furnace temperature stably at the char and fly ash melting temperature by charging the char into the char melting furnace. Further, by blowing the waste plastic from the tuyere of the shaft furnace type direct melting furnace, an effect of reducing the amount of coke used can be expected.

[0013] Further, the present invention as a facility suitable for carrying out the above-mentioned waste disposal method, according to the present invention, treats waste consisting of combustibles and incombustibles to produce pyrolysis char and pyrolysis gas. A shaft furnace type direct melting furnace, a char melting furnace for introducing a pyrolysis char and a gas combustion furnace for introducing a pyrolysis gas, which are arranged at the subsequent stage of the shaft furnace type direct melting furnace, and were installed following the char melting furnace. A wet cleaning device for wet cleaning combustible gas or combustion exhaust gas, a dust collection device arranged to communicate with the wet cleaning device, the char melting furnace and the gas combustion furnace, and a waste heat recovery boiler connected to the gas combustion furnace And a power generator.

[0014]

FIG. 1 is a block diagram showing an example of equipment for carrying out the waste disposal method of the present invention. FIG.
As shown in the figure, the waste treatment equipment comprises a shaft furnace type direct melting furnace 1 for melting and processing waste at a high temperature;
A gas-solid separation device 2 such as a cyclone for separating the pyrolysis char and pyrolysis gas generated in the above, a char melting furnace 3 and a combustion furnace 4 arranged following the solid-gas separation device 2, 4, a gas cooler 5 provided at the rear of the gas cooler 5, a dust collector 6 provided after the gas cooler 5 to collect fly ash in the cooling gas, and a smoke exhauster arranged at the rear of the dust collector 6. 7 and
It comprises a waste heat recovery boiler 8 attached to the combustion furnace 4 and a steam turbine power generation device 9 for generating electricity by using the recovered steam from the waste heat recovery boiler 8. Preferably, a wet cleaning device 21 for performing wet cleaning of gas is provided between the char melting furnace 3 and the combustion furnace 4.

The shaft furnace type direct melting furnace 1 puts the waste 13 and coke without being crushed or crushed by a crusher into the furnace, and feeds oxygen or oxygen-enriched air 10 and air 11 from the lower tuyere. Blowing and burning, discharging slag and metal 12 resulting from the melting of incombustibles from the bottom, and filling waste and coke sequentially from the top,
The furnace is maintained at a high temperature of about 1500 ° C. or more and generates pyrolysis gas and pyrolysis char as by-products. In addition, limestone is charged into the shaft furnace type direct melting furnace 1 in order to improve the fluidity of the molten slag, but chlorine in waste is converted into char by a desalination reaction (caCl ₂ conversion) by limestone. Can be fixed.

The char melting furnace 3 is provided with one or more burners 18 on the side in the form of a gas-bed furnace, and converts the pyrolysis char 20 supplied from the solid-gas separation device 2 into oxygen or oxygen-enriched air (or (Combustion) in the char is partially or completely burned and gasified,
The ash contained in the char is melted and turned into slag. The pyrolysis char 20 is directly discharged together with the pyrolysis gas from the melting furnace 1, collected by the solid-gas separation device 2, and transported by a stream of nitrogen or air via a hopper, and then the char melting furnace 3 with an oxidizing agent is discharged. Is supplied to the burner 18. The char melting furnace 3 generates a small amount of char from the shaft furnace type direct melting furnace 1, and thus can be a small and compact melting furnace.

The combustion furnace 4 has one or a plurality of nozzles 17 for blowing a pyrolysis gas 19 and air 15 supplied from the solid-gas separation device 2 on the lower side, and has a gas outlet on the upper side. In the combustion furnace 4, the combustible gas supplied by being wet-cleaned from the char melting furnace 3 and the pyrolysis gas 19 blown from the nozzle 17 are completely burned at a temperature of about 900 ° C. to 1000 ° C. The flue gas discharged from the combustion furnace 4 is recovered in a waste heat recovery boiler 8, and the resulting superheated steam drives the next steam turbine generator 9 to obtain electric power.

The gas cooling device 5 cools the gas discharged from the combustion furnace 4 to a temperature at which dust can be collected.
The gas is cooled by water spray cooling. The cooled gas is sent to the next dust collector 6 such as a bag filter, where the dust is collected. The clean gas that has passed through the dust collection device 6
Is discharged from

Hereinafter, the process flow of the waste treatment equipment shown in FIG. 1 will be described. The incombustibles in the waste treated at high temperature in the shaft furnace type direct melting furnace 1 are slag, metal 12
The pyrolysis gas and the pyrolysis char, which are discharged as a secondary gas, are separated into the pyrolysis gas 19 and the pyrolysis char 20 by the solid-gas separation device 2, and the pyrolysis gas is mounted on the combustion furnace 4. Is entered. The discharged slag and metal are used for civil engineering construction materials and heavy aggregates. On the other hand, the pyrolysis char is blown from the burner 18 together with oxygen or the oxygen-enriched gas 14 in the char melting furnace 3, and at a high temperature of 1300 ° C. or more, the organic matter in the pyrolysis char is converted to a high temperature mainly composed of CO and CO ₂ . It gasifies into flammable gas and melts ash in pyrolysis char. By partially burning only the pyrolysis char with oxygen or oxygen-enriched air, the melting furnace temperature can be maintained at a high temperature by self-heating even with a low-calorie char, and combustible gas can be generated from the char. In some cases, air 14 can be blown from the burner 18 of the char melting furnace 3 to completely burn the pyrolysis char.

The high-temperature gas (combustible gas or combustion exhaust gas) 22 generated in the char melting furnace 3 is introduced into the combustion furnace 4 without treatment (in the case of combustible gas), or the combustion furnace or gas is left untreated. Although it is possible to introduce it into a cooling device (in the case of complete combustion exhaust gas), in order to suppress dioxin resynthesis and prevent boiler corrosion, a wet cleaning device 2
It is desirable that 1 removes corrosive components such as HCl and alkaline dust. The combustible gas 23 cleaned by the wet cleaning device 21 is introduced into the combustion furnace 4, and the purified complete combustion exhaust gas 24 is directly sent to the dust collection device 6. In the combustion furnace 4, the combustible gas 23 and the nozzle 17
Is completely combusted by the pyrolysis gas 19 and the air 15 blown from the air.

Since the flue gas discharged from the combustion furnace 4 has the corrosive components removed in advance as described above, the steam conditions when heat is recovered by the waste heat recovery boiler 8 can be increased in temperature and pressure. The superheated steam collected by the waste heat recovery boiler 8 generates electric power in the steam turbine power generation device 9 to obtain electric power. The exhaust gas heat recovered by the boiler is appropriately gas-treated after cooling.

On the other hand, fly ash obtained by washing the gas generated from the char melting furnace 3 and fly ash 26 and 27 collected by removing dust from the combustion exhaust gas from the combustion furnace 4 are returned to the char melting furnace 3, where they are collected. It is melted and converted into slag 16 for processing.

In the waste treatment method of the present invention, the waste plastic 25a, the waste plastic 25a, and the nozzle 17 of the combustion furnace 4 and the tuyere of the shaft furnace type direct melting furnace 1, respectively, are used. It is also possible to blow 25b and 25c. It may be blown into all places, or may be blown into two places or one place as appropriate. When the waste has a high moisture content and a low pyrolysis gas calorie, the waste plastic is mainly blown into the shaft furnace type direct melting furnace 1 or the combustion furnace 4. Also, by injecting waste plastic from the tuyere of the shaft furnace type direct melting furnace 1, the amount of coke used can be reduced, and when the amount of ash in the waste is large and the calorific value of the pyrolysis char is low, the char melting furnace is used. By blowing the waste plastic into 3, it becomes easy to stably maintain the furnace temperature at the char and fly ash melting temperature.

[0024]

EXAMPLES (Example 1) Wastes were treated using the equipment shown in FIG. 1 under the following conditions. [Implementation conditions] ・ Waste Low calorific value of about 2000 kcal / kg, flammable content of about 45%, moisture of about 45%, non-combustible materials such as empty cans, empty bottles, rubble, etc., about 5%, and chlorine about 0.5%. Municipal garbage was charged into a shaft furnace type direct melting furnace without crushing, and treated at a processing rate of 100 t / D.・ Shaft furnace type direct melting furnace Oxygen gas 240Nm ³ / hr, air 2700Nm ³ / hr is blown, coke of calorific value 7500kcal / kg is 0.1T / hr,
Limestone is charged at 0.3 T / hr and melting temperature is about 1700 ℃ ～ 1
The waste was melted at 800 ° C. By this melting treatment, 490 kg / hr of the melt and 7000 Nm ³ / h of pyrolysis gas
r, a product of pyrolysis char 170 kg / hr was obtained. The pyrolysis char and pyrolysis gas were separated by the subsequent cyclone, and the pyrolysis char was introduced into the char melting furnace and the pyrolysis gas was introduced into the processing furnace. Char Charging Furnace Oxygen gas of 50 Nm ³ / hr was blown, the char was gasified at 1400 ° C., and the generated gas was scrubber-cleaned and alkali-wet-desalted by a wet cleaning device before being introduced into the combustion furnace. Combustion furnace air 12000 nm ³ / hr is blown, 900 pyrolysis gas and char melting furnace gas after washing from the cyclone
It burned completely at 1000 ° C. The flue gas discharged from the combustion furnace was recovered in a boiler to recover its sensible heat, and the recovered superheated steam was used to generate steam turbine power. The gas after the waste heat boiler is
After cooling with a temperature control tower and removing fly ash with a bag filter, the mixture was discharged from a smoke exhaust system. Since the above-mentioned combustion exhaust gas is preliminarily removed of corrosive components such as HCl and alkali dust, the steam conditions at the time of heat recovery by the waste heat boiler are set to 500 ° C.
High pressure and high pressure could be achieved.

[Results] Since the melt in the shaft furnace type direct melting furnace does not include the melt of fly ash, there is no concentration of heavy metals and recycling is easy. That is, the molten material was separated into slag and metal by magnetic separation, and the slag was reused as a material for civil engineering and construction, and the metal was reused as a counterweight of heavy equipment. In addition, power of 2900 kW can be obtained by the steam turbine power generation, and the power generation efficiency is about 30%, which is higher than the power generation efficiency of the existing refuse treatment furnace of 10 to 20%. In addition, fly ash collected by washing the gas generated from the char melting furnace and fly ash collected from the combustion furnace exhaust gas by a bag filter are returned to the char melting furnace and melted together with the pyrolysis char to reduce to about 1/2. The volume could be reduced. Moreover, by making the fly ash into molten slag at this stage, it became possible to reduce the volume and to confine the heavy metal in the fly ash in the slag.

Example 2 The conditions of the waste, the shaft furnace type direct melting furnace and the char melting furnace were the same as in Example 1, but the following waste plastic was used together with the waste. -Waste plastic Granulate waste plastic with a calorific value of 10,000 kcal / kg composed mainly of polyethylene, polypropylene, polystyrene and polyvinyl chloride, and put it in a char melting furnace at 200 kg / kg.
Infused with hr. In the char melting furnace, the pyrolysis char 130
kg / hr and waste plastic 200kg / hr with oxygen 220Nm ³
/ Hr partial combustion / gasification. Thermal efficiency was improved by 40% compared to gasification of pyrolysis char alone (cold gas efficiency 50
% → 70%).・ Combustion furnace Air is blown at 16,000 Nm ³ / hr to supply pyrolysis gas from the cyclone and char melting furnace gas after cleaning from 900 to
It burned completely at 1000 ° C. From the combustion exhaust gas discharged from the combustion furnace, superheated steam at 500 ° C. and 100 atm was collected by a waste heat boiler, and steam turbine power generation was performed. The gas after the waste heat boiler was cooled by a temperature control tower, fly ash was removed by a bag filter, and then discharged from a smoke exhaust device.

[Results] Although almost the same results as in Example 1 were obtained for the results of recycling of the melt, no concentration of heavy metals, recovery of heat energy, volume reduction, etc., the steam turbine The power generated by the power generation was 3700 kW.

[0028]

According to the present invention, it is possible to stably melt incombustibles and ash in a wide range of garbage wastes, thereby reducing the volume and recycling. Further, the pyrolysis char and pyrolysis gas generated from the waste can be completely burned to produce a combustion exhaust gas containing no corrosive component, and efficient power generation can be performed by recovering the sensible heat. In addition, the troublesome fly ash generated from a melting furnace or a combustion furnace according to the present invention can be converted into molten slag in a small-sized melting furnace, thereby solving the processing problem. Furthermore, the adoption of a shaft furnace type direct melting furnace greatly reduces the amount of pyrolysis chars generated compared to the conventional method, so that the char melting furnace can be made more compact, and there are great advantages in terms of equipment. In addition, by blowing the waste plastic into a melting furnace or a combustion furnace as appropriate, it is possible to effectively use the waste plastic and to reduce other fuels as an auxiliary fuel.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a process flow of a waste disposal method of the present invention.

[Explanation of symbols]

1: Shaft furnace type direct melting furnace 2: Solid-gas separation device 3: Char melting furnace 4: Combustion furnace 5: Gas cooling device 6: Dust collection device 7: Smoke exhaust device 8: Waste heat recovery boiler 9: Steam turbine power generation device 10: oxygen or oxygen-enriched air 11: air 12: slag, metal 13: waste 14: oxygen or oxygen-enriched air or air 15: air 16: slag 17: nozzle 18: burner 19: pyrolysis gas 20: heat Decomposition char 21: Wet cleaning device 22: Char melting furnace generated gas 23: Combustible gas after cleaning 24: Complete combustion exhaust gas after cleaning 25a, 25b, 25c: Waste plastic 26, 27: Fly ash

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F23G 5/14 ZAB F23G 5/16 ZABE 5/16 ZAB 5/24 ZABB 5/24 ZAB ZABC 5/48 5 / 48 7/12 ZABZ 7/12 ZAB F23J 1/00 B F23J 1/00 B09B 3/00 302G 15/02 303K F23J 15/00 C (72) Inventor Hachiro Harajiri Ohara Nakahara 46- 59 Nippon Steel Corporation Engineering Business Unit (72) Inventor Morihiro Osada 46-59 Nakahara Ogata, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation Engineering Business Unit (72) Inventor Sou Ono Kitakyushu, Fukuoka Prefecture 46-59 Nakahara, Tobata-ku New Nippon Steel Corporation Engineering Business Unit F-term (reference) 3K061 A A16 AA24 AB02 AB03 AC01 AC13 AC20 BA05 BA10 CA07 DA03 DA18 FA10 FA21 NB08 3K065 AA16 AB02 AB03 AC01 AC13 AC19 AC20 BA05 BA10 3K070 DA01 DA05 DA06 DA08 DA35 DA49 DA56 DA87 3K078 AA05 AA05 AA05 BA03 BA21 BA24 CA21 CA24 CA21

Claims (6)

[Claims] 1. A waste consisting of combustibles and incombustibles is treated in a shaft furnace type direct melting furnace to generate pyrolysis char and pyrolysis gas, and then the pyrolysis char is subjected to oxygen or oxygen in a char melting furnace. Combustible gas with enriched air or completely combust with air, melt ash in char, completely combust pyrolysis gas with air in combustion furnace, and recover sensible heat of flue gas with boiler. Characteristic waste treatment method. 2. The method according to claim 1, wherein a combustible gas obtained by gasification with oxygen or oxygen-enriched air in a char melting furnace or a combustion exhaust gas obtained by completely burning with air is wet-washed. Waste treatment method. 3. Fly ash collected by a dust removal process of flue gas from a combustion furnace and fly ash collected by wet cleaning of combustible gas or complete flue gas generated from a char melting furnace are introduced into a char melting furnace. 3. The method for treating waste according to claim 2, wherein the waste is melted. 4. The combustion furnace according to claim 2, wherein the combustible gas generated from the char melting furnace is introduced into the combustion furnace after wet cleaning.
Waste treatment method as described. 5. The waste plastic according to claim 1, wherein the waste plastic is blown into at least one of a shaft furnace type direct melting furnace, a char melting furnace and a combustion furnace. Processing method. 6. A shaft furnace type direct melting furnace for processing waste comprising combustibles and incombustibles to generate a pyrolysis char and a pyrolysis gas, and a heat furnace disposed downstream of the shaft furnace type direct melting furnace. A char melting furnace for introducing a cracking char, a gas combustion furnace for introducing a pyrolysis gas, a wet cleaning device for wet cleaning combustible gas or combustion exhaust gas installed following the char melting furnace, the wet cleaning device, the char melting A waste treatment facility comprising: a dust collection device arranged to communicate with a furnace and a gas combustion furnace; and a waste heat recovery boiler and a power generation device connected to the gas combustion furnace.