JP2000279916A - Waste treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat waste of low heat generation such as general waste with fuel reduced consumption and reduced formation of dioxins is restrained by mixing waste of low heat generation and/or a carbonized product of waste with carbide of refuse solid fuel to subject the mixture to heating treatment. SOLUTION: In a gasifying treatment method, both waste of low heat generation and carbide of refuse solid fuel are fed into a high temperature reaction furnace, and also oxygen containing gas such as air is blown into the high temperature reaction furnace. Combustibles in material to be treated are burned and thermally decomposed by the oxygen containing gas to gasify them in the high temperature reaction furnace. In this case, by adjusting the oxygen concentration in the oxygen containing gas and the fed quantity of the oxygen containing gas, the generated gas can be recovered as fuel gas containing carbon monoxide and hydrogen. And the residue not gasified by thermal decomposition is melted in the high temperature reaction furnace and turned into melt constituted of molten metal and molten slag, which is recovered from a melt discharge port in the lower part of the high temperature reaction furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to wastes having a low calorific value, such as general wastes such as sewage sludge and garbage.
The present invention relates to a waste treatment method capable of significantly reducing the amount of fuel used such as kerosene and suppressing the production of dioxins.

[0002]

2. Description of the Related Art In recent years, waste disposal has attracted social interest. General wastes such as sewage sludge and garbage have a low calorific value and cannot be self-combusted by themselves, so conventionally, combustion of auxiliary fuels such as kerosene and heavy oil
Alternatively, it is incinerated by co-firing with coke breeze.

On the other hand, the separation and collection of garbage has become widespread in accordance with the Containers and Packaging Recycling Law, and the generation of waste such as general waste from households has been reduced (the amount of generated heat has been reduced). When treating low-quality waste, it was necessary to install an auxiliary burner in the incinerator and perform incineration by burning auxiliary fuel. In other words, general waste such as sewage sludge and garbage must be incinerated by burning auxiliary fuels such as kerosene and heavy oil, or by co-firing with coke breeze, etc. It has become.

On the other hand, municipal waste, household waste, industrial waste,
Refuse-derived fuel (RDF: Refuse Derived Fuel) manufactured by crushing, pulverizing, drying, and molding combustible materials selected from general waste and shredder dust, which is a crushed product of automobile parts and home appliance parts ) Is under development. The above solid waste fuel is generally 4200
It has a low calorific value of ~ 4500 kcal / kg, and has been used effectively by burning in a stoker type incinerator or fluidized bed type incinerator and recovering heat in a waste heat boiler.

However, the solid waste fuel having a high calorific value often contains a chlorine compound such as a vinyl chloride resin, so that the flue gas treatment accompanying the recent tightening of dioxin regulations and the treatment of the generated combustion ash. It is the present situation that is suffering.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and reduces waste having a low calorific value, such as sewage sludge and garbage, into fuel such as heavy oil and kerosene. It is an object of the present invention to provide a method for treating waste, which can greatly reduce the amount of waste used and can treat it while suppressing the generation of dioxins.

[0007]

SUMMARY OF THE INVENTION According to the present invention, wastes are characterized in that a waste of low calorific value and / or a carbonized product of the waste are mixed with a solid waste carbonized carbide and heat-treated. Processing method. In the present invention described above, the above-mentioned carbides of the solid refuse are crushed or pulverized, dried, and then crushed or pulverized with the solids of the refuse solid fuel and / or refuse obtained by molding.
It is preferable that the solid fuel is obtained by drying after molding.

In the present invention, the heat treatment is preferably incineration or gasification by partial oxidation using an oxygen-containing gas. Further, the oxygen concentration in the oxygen-containing gas in the gasification treatment by partial oxidation using the oxygen-containing gas is preferably 1.5 vol% or less. In the present invention, the waste having a low calorific value has a low calorific value (= low calorific value).
It is preferably used as a method for treating waste having a low calorific value, preferably 1800 kcal / kg or less, more preferably a low calorific value (= low calorific value) of 500 to 1800 kcal / kg.

Further, in the present invention described above, it is preferable that the waste having a low calorific value is a waste having a low calorific value containing a total of 50 wt% or more of sewage sludge and / or garbage. The method of blending the solid waste fuel carbide with the waste having a low calorific value and / or the carbonized product of the waste in the above-described present invention and performing the heat treatment is the above-described two or three types of treatment. A method of heat-treating materials in a co-existing state in a heat treatment device such as an incinerator or a high-temperature reactor for gasification treatment is shown, and it is not essential to mix them before heat treatment.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The present inventors have conducted intensive studies in order to solve the above-mentioned problems of the prior art, and found that waste having a low calorific value and / or a carbonized product of the waste contain refuse solid fuel [hereinafter
It has been found that the following effects (1) and (2) can be obtained by blending and heat-treating a carbide of RDF (also referred to as Refuse Derived Fuel).

(1) Achievement of energy saving: Waste with a low calorific value can be treated by drastically reducing the amount of fuel such as heavy oil and kerosene to achieve energy saving. (2) Suppression of generation of dioxins: As described later, the carbon content of refuse solid fuel shifts into the carbonization gas during the carbonization of refuse solid fuel, and the chlorine content in the carbide decreases significantly. Even if the carbonized solid fuel is mixed with waste having a low calorific value and the carbonized product of the waste and subjected to heat treatment, the generation of dioxins is greatly suppressed.

Further, the carbonized gas generated during the carbonization of the refuse solid fuel can be burned at a high temperature, and as a result, the generation of dioxins due to chlorine transferred to the carbonized gas during the carbonization of the refuse solid fuel is greatly suppressed. You. Hereinafter, I. waste having a low calorific value, II. Carbide of refuse solid fuel (: RDF), and III. Heat treatment according to the present invention will be described in this order.

[I. Low waste with low calorific value:]
It is suitably used as a method for treating low calorific value waste having a low calorific value (= low calorific value) of 1800 kcal / kg or less.
The waste having a low calorific value in the present invention preferably has a lower calorific value (= low calorific value) of 500 to 1800 kcal / k.
g of waste.

[0014] Such waste having a low calorific value includes:
Preferably, general wastes such as garbage shown in Table 1 and sewage sludge are exemplified. Note that the lower heating value (= lower heating value) is obtained by subtracting the latent heat of water vapor generated during combustion from the total heating value.

[0015]

[Table 1]

[II. Carbide of Waste Solid Fuel (: RDF)] FIG. 4 is a flow sheet showing an example of a process for producing a solid waste fuel carbide according to the present invention. For garbage such as municipal waste, household waste, industrial waste, general waste, and shredder dust (crushed products such as home appliances and automobile parts), glass, ceramics, and metals have been removed by bag breakage, foreign matter separation, and magnetic separation. Thereafter, the obtained refuse mainly composed of combustibles is crushed or pulverized, and dried using steam from a boiler in a carbonization process of refuse solid fuel described later as a heat source.

The dried refuse is crushed or pulverized again, and lime or slaked lime used as a dechlorinating agent, a water removing agent, and a solidifying agent is added as necessary. Solid waste fuel (: RDF) is produced. The refuse solid fuel thus produced is sieved as required, and then conveyed to a carbonization step where it is carbonized in a carbonization device to produce a refuse solid fuel carbide.

On the other hand, the carbonized gas generated in the carbonization device is completely decomposed by dioxins by high-temperature combustion of 1000 ° C. or more by the carbonized gas high-temperature combustion device, and then heat is recovered in the form of steam by the boiler. Part of the obtained steam is used as a heat source in the above-mentioned refuse drying step.

Further, in the present invention, as shown in FIG. 4, refuse is crushed or pulverized, dried, and then molded as refuse solid fuel (: RDF), which is a raw material of the carbide of the refuse solid fuel. It is preferable to use the refuse solid fuel obtained as described above, but as shown in FIG. 5, refuse is crushed or pulverized as refuse solid fuel (: RDF), which is a raw material of a carbide of the refuse solid fuel, and after molding, It is preferable to use a refuse solid fuel obtained by drying, and it is also possible to use both in combination.

In the case where drying is performed after the above-described molding, the drying may be performed in the heating stage of the carbonization step. As mentioned above, the manufacturing process of the refuse solid fuel carbide according to the present invention has been described. However, since the refuse solid fuel carbonization device (dry distillation furnace) illustrated in FIGS. 4 and 5 is a self-burning type, supply of energy from outside is performed. Is required only slightly at the time of startup, and the fuel required for the carbonization apparatus (carbonization furnace) may be small.

Further, the lower heating value (==) of the carbide obtained in the process of manufacturing the carbide of the refuse solid fuel illustrated in FIGS.
Low calorific value) can obtain at least 3500-4000 kcal / kg. [III. Heat Treatment] In the present invention, a waste solid fuel and a carbonized waste are blended with a waste having a low calorific value and / or a carbonized product of the waste, followed by heat treatment.

The above-mentioned heat treatment is preferably a gasification treatment by incineration treatment or partial oxidation (: partial combustion). According to the present invention, as described above, the chlorine content in the refuse solid fuel is transferred to the carbonization gas during carbonization of the refuse solid fuel, and the chlorine content in the carbide is significantly reduced. Is mixed with waste having a low calorific value and a carbonized product of the waste, and heat treatment such as incineration greatly suppresses the generation of dioxins.

Further, as described above, the carbonization gas generated during the carbonization of the refuse solid fuel can be burned at a high temperature, and as a result, the generation of dioxins due to the chlorine transferred to the carbonization gas during the carbonization of the refuse solid fuel. Is greatly suppressed. [III.-1. Incineration:] In the present invention, for example, the RDF carbide transported from the garbage solid fuel carbide manufacturing facility is put into a garbage pit, mixed appropriately with waste having a low calorific value in the garbage pit, and provided with a grab bucket. Put in the incinerator by crane.

The mixing ratio of the low calorific value waste and the RDF carbide varies depending on the calorific value of the low calorific value waste, but the lower calorific value of the mixture is 1800 to 3000 kcal / kg, more preferably 1800 to 3000 kcal / kg. What is necessary is just to mix so that it may become 2500 kcal / kg. That is, the mixing ratio can be determined by heat calculation in accordance with the amount of waste having a low calorific value to be incinerated and the lower calorific value of the waste.

In the case of the incineration treatment, preferably, the RDF carbide is temporarily stored in the hopper, and the required amount is uniformly dispersed in the garbage pit. ADVANTAGE OF THE INVENTION According to this invention, waste with a low calorific value, such as sewage sludge and garbage, can be incinerated without additional cooking of kerosene, heavy oil, etc., and resource saving can be achieved.
As described above, since the refuse solid fuel carbonization device (dry distillation furnace) illustrated in FIGS. 4 and 5 is a self-combustion type, external supply of energy is only slightly required at the time of startup. In addition, the entire waste according to the present invention can be treated by greatly reducing the amount of fuel used.

Since the RDF carbide has a low chlorine content, the generation of dioxins during incineration can be suppressed. [III.-2. Gasification treatment:] In the present invention, waste having a low calorific value and / or a carbonized product of the waste are
It is preferable to mix carbide of refuse solid fuel and perform partial oxidation (partial combustion) and gasification using an oxygen-containing gas.

The gasification treatment by partial oxidation according to the present invention means that an oxygen-containing gas is blown in during the heat treatment of an object to be treated, and the oxygen concentration in the oxygen-containing gas and the supply amount of the oxygen-containing gas are set to predetermined values. By setting the value, the complete oxidation (complete combustion) of the object to be treated and / or the pyrolysis product gas of the object to be treated is suppressed, and the generated gas containing carbon monoxide and hydrogen is obtained by the partial oxidation (: partial combustion). It is a gasification method.

In the gasification treatment by partial oxidation using the oxygen-containing gas of the present invention, the oxygen concentration in the oxygen-containing gas is as follows:
It is preferably at most 1.5 vol%. This is because by reducing the oxygen concentration to 1.5 vol% or less, the calorific value of the generated gas (fuel gas) obtained by the gasification treatment increases, and the amount of the generated gas decreases significantly. This is because the conversion can be achieved.

FIGS. 1 and 2 show an example of a preferred gasification system in the present invention. In the gasification system shown in Fig. 1, waste and refuse solid fuel (: RDF) with low calorific value
(Hereinafter, also referred to as an object to be treated) are charged into a high-temperature reactor, and an oxygen-containing gas such as air is blown into the high-temperature reactor. In the gasification method shown in FIG. 2, waste having a low calorific value is subjected to heat treatment in a heating furnace in which the wall temperature of the furnace is maintained at 500 to 800 ° C., followed by drying, thermal decomposition and carbonization. The obtained carbonized product of waste having a low calorific value and the char of refuse solid fuel (: RDF) are charged into a high-temperature reactor, and the oxygen-containing gas is blown into the high-temperature reactor.

In the gasification system shown in FIGS. 1 and 2, the combustibles in the object to be treated are gasified by being burned and thermally decomposed by an oxygen-containing gas in a high-temperature reactor. In this case, the generated gas can be recovered as a fuel gas containing carbon monoxide and hydrogen by adjusting the oxygen concentration in the oxygen-containing gas and the supply amount of the oxygen-containing gas. Residues (non-combustible components) that are not gasified by combustion and thermal decomposition are melted in the high-temperature reactor to become a melt composed of molten metal and molten slag, and a melt outlet at the lower part of the high-temperature reactor. Recovered from.

In the gasification system shown in FIGS. 1 and 2, as shown in FIG.
A washing device is provided to quench and wash high-temperature generated gas to prevent the synthesis of dioxins and to absorb and remove hydrogen chloride. Next, FIG. 3 shows an example of a gasification treatment facility to which the present invention is preferably applied by a side sectional view.

In the gasification treatment system shown in FIG. 3, in the gasification treatment system shown in FIG. 2, waste having a low calorific value is compression-formed in advance, and the obtained compression-formed product is charged into a tunnel type heating furnace. Then, the carbonized products of waste with low calorific value generated by being dried, pyrolyzed and carbonized in the tunnel type heating furnace are sequentially charged into the high-temperature reactor, and the garbage of solid fuel is removed from the high-temperature reactor. And gasification of the object to be processed and melting of non-combustible components.

In FIG. 3, reference numeral 1 denotes pressurization of waste,
Compression device, 2 is a compression cylinder, 3 is a compression support plate, 4 is
Drying of compressed waste (hereinafter also referred to as compression molded product),
Tunnel type heating furnace for pyrolysis and carbonization
4a is the dry area of the compression molded product, 4b is the compression
Pyrolysis and carbonization of shaped objects, 4_EIs a tunnel heating furnace (:
Channel) 4 inlet, 5 high temperature reactor, 10a, 10i
Compression molding, 11_i, 11 _nIs a carbonized compression molded product
12) is a mixture of carbonized products and combustion residues
Material, 13 is an oxygen-containing gas inlet, 15 is a melt, 15H
Is the melt outlet, 20 is the waste inlet, 21 is the waste inlet
Lid, 30 is the solid fuel carbide hopper, 31 is the solid waste
-Type fuel carbide storage tank, 32a and 32b are gate valves, 40 is
Pressing of carbonized product of tunnel type heating furnace (: channel) 4
Outlet (: inlet for charging carbonized product into high-temperature reactor 5),
50 is the exhaust gas discharge pipe of the high-temperature reactor 5, 50a is the high-temperature reaction
The outlet gas of the generated gas of the furnace 5, 51 is a gas outlet of the high temperature reactor 5.
Rapid cooling / cleaning device, 52 to spray nozzle 53 for water for rapid cooling / cleaning
Water supply pipe, 60 is the generated gas (: fuel gas
S), 61 is the quenching / washing water discharged, f₁Is compression molding
Direction of movement of objects 10a, 10i, 10n, f_TwoIs the carbonized product 11_n
The moving direction of f_ThreeIs a tunnel heating furnace (: channel)
4, the flow direction of the pyrolysis gas generated in_FourIs a high temperature reaction
Direction of blowing oxygen-containing gas into the furnace 5, f_FiveIs for compression
Moving direction of cylinder 2, f₆Is how to move the compression support plate 3
Direction, f₇Indicates the direction of rotation of the lid 21 of the waste inlet 20.

That is, in the gasification treatment equipment shown in FIG. 3, the waste having a low calorific value is batch-pressurized and compressed by the pressurizing and compressing device 1, and the obtained compression-molded product is subjected to a tunnel-type process. It is charged into the heating furnace 4 and dried, thermally decomposed and carbonized. The obtained carbonized product is sequentially charged into the high-temperature reactor 5 by driving the compression cylinder 2, and gasification by partial oxidation of the carbide and melting of incombustible components are performed.

Further, in the high-temperature reactor 5, carbide of refuse solid fuel is charged via a hopper 30, a gate valve 32a, a storage tank 31, and a gate valve 32b, and together with waste carbide having a low calorific value. Then, gasification and non-combustible components are melted by partial oxidation of the processing object. In the present invention, the mixing of the carbide of waste having a low calorific value (: the carbide with a low calorific value) and the carbide of the refuse solid fuel (: the carbide with a high calorific value) is improved, To accelerate gasification,
As shown in FIG. 3, both the solid fuel and the waste having a low calorific value are charged into a heating furnace for carbonization (tunnel heating furnace 4) and carbonized, and the obtained mixed carbide is subjected to a high-temperature reaction. It is also preferable to charge the mixture in a furnace to perform gasification by partial oxidation of the mixed carbide and melting of non-combustible components.

In this case, since the carbides of the refuse solid fuel are treated again by the heating furnace, the filling amount of the waste having a low calorific value per unit volume of the heating furnace (tunnel heating furnace 4) for carbonization decreases. However, the required carbonization time per unit volume of the material to be treated is reduced, and by charging a mixed carbide, which is a mixture of a carbide of waste and a solid waste fuel with a low calorific value, into a high-temperature reactor, Gasification in the high-temperature reactor proceeds rapidly.

As a result, it is possible to avoid a reduction in the throughput per unit time of the entire gasification treatment facility. In addition,
The gasification system shown in FIGS. 1 to 3 described above basically uses the energy by partial combustion (: partial oxidation) of the object without using auxiliary fuel such as kerosene or heavy oil. This is a method for gasifying and melting and recovering non-combustible components.

When an external heating type heating system using a high temperature gas or the like is used as a heating system for the heating furnace (tunnel type heating furnace 4) for carbonization, a combustion gas generated from the high temperature reaction furnace 5 can be used. In addition, less fuel is required in the entire gasification treatment facility. As mentioned above, although the example of the specific processing method of the gasification processing in the present invention has been described, according to the partial oxidation using oxygen-containing gas (: partial combustion) and the gasification processing method in the present invention, the following ( The excellent effects of 1) to 3) are obtained.

(1) Elimination of restrictions on the scale of the waste gasification treatment facility: According to the above-mentioned method, the low calorific value of the waste having a low calorific value is, for example, about 3500 to 4000 kcal / kg. By blending and gasifying RDF carbide having a high content, the calorific value of the object to be treated is increased, and the object to be treated can be smoothly gasified by the oxygen-containing gas.

That is, in the gasification treatment method shown in FIGS. 1 to 3, the ratio of the amount of heat dissipated by the furnace of the high temperature reactor to the amount of heat generated by partial combustion of the object to be processed by the oxygen-containing gas is determined by the high temperature reactor. Is inversely proportional to the internal volume of As a result, in the case of gasifying low calorific value waste and / or carbonized product of the low calorific value of 1500 kcal / kg, from the viewpoint of heat compensation, the lower limit of the equipment specification of the throughput of the high temperature reactor is considered. Is limited to 75t / day.

According to the present invention, the calorific value of the object to be treated is increased by mixing RDF carbide having a high calorific value with the waste having a low calorific value and / or the carbonized product of the waste, thereby increasing the calorific value. It became possible to install gasification treatment equipment. That is, if the low calorific value of the waste with a low calorific value and / or the mixture of the carbonized product of the waste and the charcoal of RDF is 2500 kcal / kg, the gasification treatment facility with a treatment amount of 35 t / day is specified. If the lower heating value of the mixture is 3000 kcal / kg, it is possible to install gasification treatment equipment with a processing capacity of 25 t / day.

(2) Suppression of Dioxin Production: According to the gasification treatment described above, the production of dioxins can be greatly suppressed for the following reasons. : The solid chlorine content of the solid waste fuel (: RDF) is low. : High calorific value of fuel gas obtained by gasification process,
High temperature combustion of the fuel gas becomes possible.

That is, even if a chlorine compound is contained in the waste having a low calorific value, by supplying the RDF carbide to the high-temperature reactor, gasification, which is partial combustion of the object to be treated by the oxygen-containing gas, is performed. As a result, the calorific value of the fuel gas obtained increases, and high-temperature combustion of the fuel gas is possible. As a result, generation of dioxins can be significantly suppressed.

In the present invention, FIGS.
As shown in FIG. 3, a generated gas quenching / washing device is provided on the generated gas outlet side of the high temperature reactor to rapidly cool the generated gas to prevent the synthesis of dioxins and to wash and remove hydrogen chloride. preferable. (3) Effective use of the residue (: non-combustible): According to the gasification treatment with the oxygen-containing gas described above, metals in the object to be treated,
Residues that are not gasified such as glass (non-combustible components) are melted in the high-temperature reactor, become a melt composed of molten metal and molten slag, and are discharged from the melt outlet at the bottom of the high-temperature reactor. In that case, the molten metal and the molten slag can be separated by the difference in specific gravity between the two.

As a result, the residue can be effectively used as a metal raw material, a construction material, and a roadbed material.

[0046]

EXAMPLES The present invention will be described below more specifically based on examples. (Example 1) Lower calorific value produced in the refuse solidification process and the refuse solid fuel carbonization process shown in FIG. 4: 3800 kc
Al / kg, charcoal of refuse solid fuel having a water content of 7 wt% was uniformly dispersed in a pit storing sewage sludge (low-calorific value waste) having a low heating value of 750 kcal / kg and a water content of 77 wt%.

The above-mentioned spraying is performed every time sewage sludge is received in the pit, and the solid waste solid carbide is uniformly blended in the sewage sludge. The mixture was sprayed such that the lower heating value of these mixtures became 2500 kcal / kg. Next, the above mixture was put into an incinerator by a crane with a grab bucket, and an incineration experiment was performed.

As a result, sewage sludge, which is waste having a low calorific value, could be incinerated without burning auxiliary fuel such as heavy oil. The content of dioxins in the combustion gas from the incinerator is less than 0.05ng-TEQ / Nm ^3, also the content of dioxins in incineration ash is less than 0.0020ng-TEQ / g, According to the present invention, it has been found that the generation of dioxins can be suppressed.

(Example 2) Low heat value: 3600 kcal / kg, water content: 10 wt% of the waste solid fuel produced in the solid fuel conversion process and the carbonization process of the solid fuel shown in FIG. Amount: 750 kcal / kg, water: 77 wt% sewage sludge (low calorific value waste) and lower calorific value: 2000 kcal
/ kg, moisture: 60wt% garbage (low calorific value waste)
Is charged into a gasification type high temperature reactor shown in FIG.
It was gasified.

As the oxygen-containing gas, nitrogen containing 1.2 vol% of oxygen in the mixed gas was used.
In addition, the compounding amount of the solid waste fuel carbide to sewage sludge and garbage is such that the lower heating value of these compounds is 2500 kcal / k
g was set. As a result, the temperature in the furnace of the high-temperature reactor was maintained at 1000 ° C. or higher, and gasification of the object to be processed was successfully performed.

The content of dioxins in the combustion gas when burning the generated gas (: fuel gas) (lower heating value: 2200 kcal / Nm ³ ) washed in the high temperature reactor is as follows:
It is less than 0.01 ng-TEQ / Nm ³ , which indicates that the present invention can suppress the generation of dioxins. (Embodiment 3) Lower calorific value produced in the solid fuel conversion process and the carbonization process of the solid fuel shown in FIG. 4: 3800 kc
al / kg, water: 7 wt% of garbage solid fuel carbonized and low calorific value: 750 kcal / kg, water: 77 wt% sewage sludge (waste with low calorific value), high temperature of gasification treatment equipment shown in Fig. 3 Gasification was performed in a reactor.

As the oxygen-containing gas, nitrogen containing 1.2 vol% of oxygen in the mixed gas was used.
In addition, the supply of carbides of solid waste fuel to sewage sludge is such that the lower heating value of the whole of these treated materials is 2500 kcal / kg.
Supply and supply of solid waste fuel
1/2 was supplied from the waste inlet 20 together with the sewage sludge, and 1/2 of the carbonized solid fuel was directly supplied from the hopper 30 into the high-temperature reactor 5.

As a result, the temperature inside the high-temperature reactor was 1000 ° C.
By maintaining the above, the gasification of the object to be processed was successfully performed. The content of dioxins in the combustion gas when burning the generated gas (fuel gas) (lower heating value: 2200 kcal / Nm ³ ) washed from the high-temperature reactor is 0.01 ng-TEQ.
/ Nm ³ , which indicates that the present invention can suppress the generation of dioxins.

[0054]

According to the present invention, the use of low calorific value waste such as sewage sludge, garbage, and general waste can be greatly reduced, and the use of fuel such as heavy oil and kerosene can be greatly reduced. Processing can be performed with generation suppressed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a gasification processing method according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a gasification processing method according to the present invention.

FIG. 3 is a side sectional view showing an example of the gasification processing equipment to which the present invention is applied.

FIG. 4 is a flow sheet showing an example of a process for producing a solid waste fuel carbide according to the present invention.

FIG. 5 is a flow sheet showing an example of a process for producing a solid waste fuel carbide according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pressurization and compression apparatus of waste 2 Cylinder for compression 3 Compression support board 4 Tunnel type heating furnace (: channel) for drying, pyrolysis and carbonization of compressed waste (: compression molded product) 4a Compression molding Drying area of the product 4b Pyrolysis and carbonization area of the compression molded product 4 _E Entrance of the tunnel type heating furnace (: channel) 5 High temperature reactor 10a, 10i Compression molded product 11 _i , 11 _n Carbonized compression molded product (: carbonized product 12) Mixture of carbonized products and combustion residues 13 Oxygen-containing gas inlet 15 Melt 15H Melt outlet 20 Waste inlet 21 Waste inlet cover 30 Solid fuel hopper 31 Carbide storage tanks 32a, 32b Gate valve 40 Tunnel type furnace (: channel) Carbonized product extrusion port (: Charging product inlet into high-temperature reactor) 50 High-temperature reactor generated gas discharge pipe 50a High-temperature reactor generated gas emissions Mouth 51 High-temperature reactor generated gas quenching / washing device 52 Water supply pipe to spray nozzle for quenching / washing water 53 Spray nozzle for quenching / washing water 60 Washed generated gas (gas for fuel) 61 Exhausted quenching・ Washing water f ₁ Moving direction of the compression molded product f ₂ Moving direction of the carbonized product f ₃ Flow direction of the pyrolysis gas generated in the tunnel heating furnace (: channel) f ₄ Oxygen-containing gas into the high-temperature reactor direction of rotation of the lid in the movement direction f ₇ wastes inlet in the blowing direction f ₅ moving direction f ₆ compression support plate of the compression cylinder

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Claims (3)

[Claims] Claims 1. A waste material having a low calorific value and / or a carbonized product of the waste material is mixed with a carbonized solid waste fuel.
A method for treating waste, comprising performing heat treatment. 2. The refuse solid fuel carbide is obtained by crushing or crushing refuse and drying, and then crushing or crushing the refuse solid fuel carbide and / or refuse obtained by molding, forming, and then drying. The waste treatment method according to claim 1, wherein the waste is a carbide of refuse solid fuel obtained by the above method. 3. The waste treatment method according to claim 1, wherein the heat treatment is incineration treatment or gasification treatment by partial oxidation using an oxygen-containing gas.