JP2001342476A - Method and facility for producing carbonized waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both a method and facilities for producing carbonized wastes, capable of reducing a fuel in producing a waste solid fuel, forming an efficiently usable carbonized waste solid fuel and controlling formation of dioxins. SOLUTION: In subjecting a waste molding to dry distillation and carbonization by a furnace 3, a dry distillation gas generated in the dry distillation and carbonization process is burnt by combustion equipment 4. The obtained combustion gas and a gas evolved by drying waste are subjected to heat exchange by a heat exchanger 5. The gas evolved by drying waste heated by the heat exchange is preferably introduced into a waste and circularly used in a drying machine 1. Preferably the temperature of the combustion gas is adjusted before the heat exchange with the gas evolved by drying waste. The temperature adjustment of the combustion gas is preferably carried out by installation of a heat exchanger for a boiler and preferably the exhaust heat of the combustion gas is effectively recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing refuse carbide, and more particularly, to a method for producing refuse carbide capable of reducing fuel consumption during the production of refuse carbide and suppressing the production of dioxins. Related to manufacturing equipment.

[0002]

2. Description of the Related Art In recent years, waste disposal has attracted social interest. In other words, due to the location problem when constructing a waste incineration facility, only combustible waste is sorted, crushed, dried, molded, and solid waste recycling technology for environmentally friendly waste is actively used as fuel. Development is underway.

[0003] Refuse Derived Fuel (RDF)
Or WDF: Waste Derived Fuel) is a solid fuel produced by crushing, drying, and molding combustible materials selected from municipal waste, household waste, industrial waste, general waste, etc., or the above combustible materials. It is a solid fuel produced by crushing, forming and drying.It generally has a calorific value of 17600 to 18800 kJ / kg.It is burned in conventional stoker type incinerators and fluidized bed type incinerators, and heat is recovered in waste heat boilers. Has been used effectively.

[0004] Fig. 4 shows a process diagram of a conventional solid waste fuel conversion facility. Municipal garbage, household garbage, industrial waste, municipal waste, and other garbage brought into the solid fuel conversion facility for garbage are
Generally, after crushing, the water in the garbage (: usually;
(Mass%) is 10% by mass or less. As this drying heat source, kerosene or heavy oil is usually used, and the unit fuel consumption is about 70 (l / t-refuse).

[0005] Dried refuse is formed in a molding step after metals, glass and ceramics are removed in a sorting step. For example, a crayon-shaped refuse solid fuel (RDF)
, WDF) is manufactured. As a method of utilizing the solid waste fuel described above, a solid waste treatment system that burns solid fuel in a fluidized bed combustion furnace, exchanges the heat of the combustion gas with a hot water boiler, and uses the resulting hot water for hot water supply and cooling / heating is realized. It is becoming.

However, in the case of the above method, a combustion furnace suitable for burning solid fuel such as a fluidized bed combustion furnace is required as a combustion furnace, and it is difficult to employ the above-mentioned waste treatment system in the private sector due to capital investment. There is a problem that it is difficult. In addition, as a method of using the solid waste fuel described above, a waste treatment system using the manufactured solid waste fuel for power generation is being realized in a plurality of regions in Japan.

[0007] However, in the case of the above-mentioned method, power generation equipment using a large amount of solid waste fuel as fuel is required from the viewpoint of equipment efficiency and thermal efficiency of the power generation equipment. Therefore, when solid waste is used for power generation, a large amount of waste is collected and solid waste is manufactured in large-scale solid fuel conversion equipment and supplied to power generation equipment or installed in many regions. Collect garbage solid fuel produced by garbage solid fuel conversion equipment,
It is necessary to supply power generation equipment.

As described above, conventionally, as a method of utilizing solid waste solid waste, a large amount of solid waste is collected from each region and solid waste solid fuel is manufactured by a large-scale solid waste solidification facility, or solid waste solid fuel is used. After collecting a large amount from each region,
There was no effective way to use it only for power generation.
Further, as described above, in the solid fuel conversion equipment for refuse, kerosene or heavy oil is usually used as a heat source for drying refuse, and the unit fuel consumption is as high as about 70 (l / t-refuse), Reduction of basic unit is an essential issue.

As a method of reducing the unit fuel consumption, it is conceivable to burn a part of the refuse solid fuel, which is a product, in the refuse solidification facility and dry the refuse with the obtained combustion heat. However, also in this case, a combustion furnace suitable for burning solid waste fuel such as a fluidized bed combustion furnace is required,
It is difficult for the private sector to adopt the above method due to capital investment.

[0010]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, reduces the amount of fuel required for producing solid fuel, and makes it possible to effectively use the obtained solid fuel. It is an object of the present invention to provide a method and a facility for producing refuse carbide, which can suppress generation of dioxins as well as the above-mentioned carbide.

[0011]

According to a first aspect of the present invention, a molded article of refuse obtained by drying and then molding garbage, or a molded article of refuse obtained by drying and drying garbage is carbonized. A method for producing refuse carbide to be carbonized, in which the carbonized gas generated in the carbonization and carbonization process is burned, and heat exchange is performed between the obtained combustion gas and the refuse drying generated gas generated by drying the refuse. And a method for producing refuse carbide, wherein the refuse drying generated gas heated by the heat exchange is circulated for drying the refuse.

In the first aspect of the present invention, it is preferable that the heated dust-generating gas is blown into the dust when the dust-generating gas is circulated and used for drying the dust. In the first aspect of the present invention, it is preferable that a part of the refuse drying gas used for circulation is extracted and burned together with the carbonization gas.

[0013] In the first aspect of the present invention, it is preferable that the temperature of the obtained combustion gas is adjusted before heat exchange with the waste drying generated gas. The temperature control of the obtained combustion gas is preferably air supply to the obtained combustion gas, and the temperature control of the obtained combustion gas is performed by heat exchange with a circulating fluid of a boiler. You may.

In the first aspect of the present invention, after the heat exchange between the refuse drying generated gas and the obtained combustion gas is completed, the heat exchange between the obtained combustion gas and the circulating fluid of the boiler is further performed. Preferably, an exchange is performed. In the first aspect, it is preferable to supply heated air obtained by heat exchange between the room-temperature air and the obtained combustion gas into the chimney.

The second invention comprises a refuse dryer 1, a refuse molding machine 2 dried by the refrigeration machine 1, and a dry distillation / carbonization furnace 3 for refuse molded products obtained by the refuse dryer 2. A combustion device 4 for the carbonization gas generated in the carbonization and carbonization furnace 3, and a heat exchanger 5 for indirect heat exchange between the combustion gas generated in the combustion device 4 and the refuse drying generation gas generated in the dryer 1. , The heat exchanger 5
A refuse drying gas circulating piping system 6 for circulating and supplying the refuse drying generated gas heated in the dryer to the dryer 1.

A third aspect of the present invention relates to a refuse molding machine 2, a dryer 1 for a refuse molded product obtained by the refuse molding machine 2,
The carbonization furnace 3 of the refuse molded product dried in the above, the combustion apparatus 4 for the carbonization gas generated in the carbonization furnace 3, the combustion gas generated in the combustion apparatus 4, and the combustion gas generated in the dryer 1. A heat exchanger 5 for indirectly exchanging heat with the refuse drying gas, and a refuse drying gas heated by the heat exchanger 5;
It is a refuse carbide production facility characterized by having a circulating piping system 6 for refuse drying generated gas that is circulated and supplied to the refuse.

In the second and third aspects of the present invention, the circulating piping system 6 for the refuse drying generated gas, which circulates and supplies the refuse drying generated gas heated by the heat exchanger 5 to the dryer 1, It is preferable to use a circulation piping system for circulating and supplying the heated waste drying gas to the waste in the dryer 1. Further, in the second and third aspects described above, there are refuse drying generated gas supply piping systems 7a and 7b for supplying refuse drying generated gas generated in the dryer 1 to the dry distillation gas combustion device 4. Is preferred.

In the second and third aspects of the present invention, the air supply pipe (9) for supplying air for temperature adjustment to the combustion gas generated in the combustion device (4) is connected to the heat exchanger. It is preferable to dispose it in (5). Further, in the second invention and the third invention, the heat exchanger
It is preferable to dispose a heat exchanger (50) for the boiler 60 for performing heat exchange with the generated combustion gas for adjusting the temperature of the combustion gas before the step (5).

In the second and third aspects of the present invention, the heat exchanger (5) is provided with a finned heat transfer tube (5B) for generating heated air, and the finned heat transfer tube is provided. (Five
It is preferable to have a heating air supply pipe (25) for supplying the heating air generated in B) to the chimney.

[0020]

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 as a result, have obtained the following findings (1) to (3), and have reached the present invention. In addition, below, after drying the garbage or crushed garbage, the garbage obtained by molding, or
After forming the refuse or the crushed refuse, the refuse obtained by drying is referred to as a refuse molded product.

(1) Production of refuse carbide by carbonization and carbonization of refuse molded product: When refuse molded product is carbonized, carbide mainly composed of carbon and carbonized gas are generated. The calorific value (lower calorific value) of the carbide is about 14,700 kJ / kg, and it has excellent flammability and can be used as various fuels.

Further, since the carbonized gas has a calorific value (lower calorific value) of about 14200 kJ / Nm ³ per 1 Nm ³ of generated gas amount, it can be used as a heat source for drying refuse and other heat sources and fuels. (2) Suppression of generation of dioxins by high-temperature combustion of carbonized gas generated during carbonization and carbonization of refuse molded products: Combustion of carbonized gas generated during carbonization and carbonization of refuse molded products at a combustion temperature of 950 ° C or more By doing so, dioxins can be completely decomposed.

(3) Drying of refuse by combustion heat obtained by high-temperature combustion of the carbonized gas: Indirect heat exchange between the combustion gas obtained by the high-temperature combustion of the carbonized gas and the gas generated by the refuse drying generated by the refuse drying. Heat is exchanged using an air dryer, and the temperature of the waste gas generated is raised to, for example, 300 to 500 ° C, and the temperature is controlled by a hot air stove, if necessary. Is dried.

According to the above-mentioned method, the amount of fuel such as kerosene and heavy oil which has been conventionally used for drying refuse can be significantly reduced. In addition, since the refuse generated gas is used again as a heating medium for drying the refuse without dissipating the refuse dry gas, a closed system for the refuse dry generated gas is formed, and the harmful substances contained in the refuse are discharged out of the system Can be prevented.

More preferably, a part of the refuse drying gas circulating between the dryer and the heat exchanger (indirect heat exchanger) is extracted and burned together with the carbonization gas. According to the above-described method, it is possible to prevent harmful substances contained in the refuse drying generated gas from burning and discharging the harmful substances out of the system, and it is also possible to deodorize the refuse drying generated gas.

Next, FIG. 1 shows an example of a facility for producing refuse carbide according to the present invention by a process chart. In FIG. 1, 1 is a dryer, 1A is a hot stove, 1B is a fuel such as kerosene,
Is a molding machine, 3 is a carbonization / carbonization furnace, 3A is a refuse molded product storage hopper, 3B is a refuse carbide storage hopper, 4 is a carbonization gas combustion device (hereinafter also referred to as a carbonization gas combustion device), and 4A is a burner ( : Afterburner), 4B is a combustion air supply header,
4C is a combustion air fan, 4D is a pure oxygen, oxygen-enriched air supply pipe, 5 is a heat exchanger (indirect heat exchanger), 5A and 5B are finned heat transfer tubes, 6, 6a and 6b are refuse generated gas Circulating piping system, 7a and 7b are refuse drying generated gas supply piping systems for supplying refuse drying generated gas to the carbonization gas combustion device 4, and 8 are supply of combustion gas of the carbonization gas burning device 4 to the combustion gas quenching device 20 Piping (combustion gas bypass pipe), 9 is an air supply pipe into the combustion gas in the heat exchanger 5, 10 is a refuse bag, foreign matter separator, 11 is a magnetic separator, 12 is a crusher, and 13 is a crusher. Equipment for supplying alkaline agents such as slaked lime;
A is fuel such as kerosene, 16 is a screw feeder, 20 is a combustion gas quenching device, 21 is a bag filter, 22 is a catalytic contact oxidation reaction tower of combustion gas, 23 is a main exhaust fan, 24 is a cooling water treatment device, and 25 is a cooling water treatment device. A supply pipe for heating air to a chimney 40; 26, a fan for supplying air; 27, cooling water; 30, an exhaust fan for adjusting the flow rate of the combustion gas introduced from the heat exchanger 5 into the combustion gas quenching device 20;
Denotes a heat exchanger, 32 denotes a medium to be heated by the heat exchanger 31, 33 denotes a separator, and 40 denotes a chimney.

In addition, the circulating piping system 6 for the waste gas generated
Is a circulation piping system for heating the refuse drying generated gas generated in the dryer 1 by the heat exchanger (: indirect heat exchanger) 5 and circulating and supplying the heated refuse drying generated gas to the dryer 1. . Further, the circulation piping system 6 for the drying generated gas described above.
Is a blast oven that uses the refuse-drying gas heated in the heat exchanger 5
This is a circulation piping system that heats and controls the temperature as needed at 1A, blows it into the refuse in the dryer 1, and circulates and supplies it.

Further, the refuse drying generated gas supply piping system 7a,
Reference numeral 7b denotes a piping system for supplying the refuse drying generated gas to the dry distillation gas combustion device 4, and as shown in FIG. A system 7a may be provided, and a refuse drying gas supply piping system 7b for heating the refuse drying gas in the heat exchanger 5 and supplying the heated refuse drying gas to the carbonization gas combustion device 4 may be provided. Or both of them may be provided.

The combustion gas quenching device 20 is of a spray cooling type in which cooling water (cooling water) is sprayed into the combustion gas. As the carbonization / carbonization furnace 3, it is preferable to use a heating furnace of an internal heat rotary kiln type, but the type of the carbonization / carbonization furnace 3 is not particularly limited. In the facility for producing garbage carbide shown in FIG. 1, general garbage such as municipal garbage and household garbage,
From waste such as industrial waste, general waste, and shredder dust obtained by crushing home appliances, automobile parts, etc., metals,
Remove glass and ceramics.

Next, the obtained refuse mainly composed of combustibles is crushed or pulverized by a crusher 12 and then charged into the dryer 1, and the refuse drying generated gas heated by the heat exchanger 5 described later is mixed with the refuse drying gas. Dry by direct contact. The refuse after drying is separated into glass by a sorter 33, which is preferably a wind sorter,
Ceramics and pebbles are removed, and if necessary, metals are removed by a magnetic separator 11 and crushed or crushed again by a crusher 12.

Next, the dried refuse is molded by the molding machine 2 to produce a molded refuse. The refuse molded product is supplied to the dry distillation / carbonization furnace 3 via the refuse molded product storage hopper 3A and the screw feeder 16. In the carbonization / carbonization furnace 3, the waste product is carbonized and carbonized, and carbonized gas is generated.

The generated carbonized gas is completely burned in a carbonized gas combustion device (a carbonized gas combustion device) 4.
In consideration of safety, high-temperature combustion gas is blown from the burner 4A. 950 ℃ generated by the carbonization gas combustion unit 4
After the high-temperature combustion gas is recovered in the heat exchanger 5 and quenched by the combustion gas quenching device 20, it passes through the bag filter 21 and the catalytic contact oxidation reaction tower 22, and is rendered harmless. Dissipated from

The refuse carbide produced by carbonization and carbonization in the carbonization and carbonization furnace 3 is discharged from the carbonization and carbonization furnace 3 and stored in a garbage carbide storage hopper 3B. On the other hand, as shown in FIG. 1, in the present invention, the carbonization gas generated in the carbonization and carbonization furnace 3 for refuse molded products is burned, and the combustion obtained in the heat exchanger (: indirect heat exchanger) 5 is obtained. Heat exchange between the gas and the refuse drying generated gas generated by drying the refuse,
The refuse drying generated gas heated by the heat exchange is circulated and supplied to the refuse dryer 1 described above.

In this case, from the viewpoint of thermal efficiency, it is preferable to directly blow the refuse drying gas heated by heat exchange into the refuse. According to the present invention described above, it is possible to greatly reduce the amount of fuel such as kerosene and heavy oil that has been conventionally used for drying refuse. In addition, since the refuse generated gas is used again as a heating medium for drying the refuse without dissipating the refuse dry gas, a closed system for the refuse dry generated gas is formed, and the harmful substances contained in the refuse are discharged out of the system Can be prevented.

In the present invention, as shown in FIG. 1, it is more preferable that the refuse-drying gas is supplied to the carbonized gas combustion device 4 and burned together with the carbonized gas. As a method of supplying the refuse drying generated gas to the dry distillation gas combustion device 4, refuse drying generated gas generated in the dryer 1 is used.
It may be directly supplied to the carbonization gas combustion device 4 via the refuse drying generation gas supply piping system 7a shown in FIG. 1, and the refuse drying generation gas heated by the heat exchanger 5 is shown in FIG. The gas may be supplied to the carbonization gas combustion device 4 via the refuse drying generated gas supply piping system 7b, or both of them may be used.

According to the above-mentioned method, it is possible to prevent the harmful substances contained in the refuse-drying gas from burning and discharge the harmful substances out of the system, and it is possible to deodorize the refuse-drying gas. . In the present invention, as shown in FIG.
It is preferable to provide a pipe 8 (a combustion gas bypass pipe) for feeding the combustion gas of the carbonization gas combustion apparatus 4 to the combustion gas quenching apparatus 20.

This is because the combustion gas corresponding to an excess amount of heat with respect to the amount of heat required in the dryer 1 is supplied to the combustion gas quenching device.
The reason for this is that it is possible to suppress the generation of dioxins by feeding the mixture to 20 and rapidly cooling it. In the present invention, as shown in FIG. 1, a heat exchanger 31 is provided in the middle of a feed pipe (combustion gas bypass pipe) 8 for feeding a combustion gas to a combustion gas quenching apparatus 20 of a carbonization gas combustion apparatus 4. It may be provided.

This is because the combustion gas corresponding to the amount of heat surplus to the amount of heat required in the dryer 1 is supplied to the heat exchanger 31 and the medium to be heated 32 is heated, so that the effective heat source other than the heat source for drying is supplied. This is because it is possible to use a great amount of heat. further,
In the present invention, as shown in FIG.
The waste drying generated gas generated in the above is extracted and supplied to the combustion chamber of the waste drying generated gas combustion device 15 provided with a burner,
A combustible component such as an odor component in the refuse dry gas may be burned by the combustion gas supplied from the burner.

As shown in FIG. 1, the waste gas generated from the waste gas generator 15 is discharged from at least one of the combustion gas quenching device 20, the bag filter 21, and the catalytic contact oxidation reaction tower 22. It is preferable to supply crab. This is the refuse drying generated gas combustion device 15
Combustion gas quenching device 20
To prevent re-synthesis of dioxins, dust and dust can be removed by supplying to the bag filter 21, and unburned components including odor components can be supplied to the catalytic contact oxidation reaction tower 22. Can be completely burned (: complete oxidation), and the refuse drying generated gas discharged from the refuse drying generated gas combustion device 15 can be completely rendered harmless.

Also, in the present invention, as shown in FIG.
Heat transfer tube 5B with fins in heat exchanger 5 supplying air supplied from 26
It is preferable that the heated air heated by flowing through the inside is supplied into the chimney 40 by the supply pipe 25 of the heated air. Further, in the present invention, the finned heat transfer tube 5A
The temperature of the combustion gas supplied to the heat exchanger 5 is controlled in order to prevent the adhesion of Na and K in the waste gas generated on the inner tube wall and to prevent corrosion by iron chloride, alkali, sulfate and the like.
It is preferable to adjust the temperature to about 500 ° C.

FIG. 1 shows a method of controlling the temperature of the combustion gas.
As shown in (2), a method of arranging an air supply pipe 9 and supplying air into the combustion gas in the heat exchanger 5 is preferable. Also,
As another method of controlling the temperature of the combustion gas, a high-pressure boiler (waste heat boiler) is provided before the heat exchanger 5 used for heat exchange with the waste drying generated gas, that is, before heat exchange with the waste drying generated gas. ) A finned heat transfer tube 50A of the heat exchanger 50 for 60 is provided to exchange heat between the combustion gas and the circulating fluid of the high-pressure boiler (waste heat boiler), and the temperature of the combustion gas falls within a desired range. It is preferred to adjust to. FIG. 3 shows an example of an apparatus using a high-pressure boiler suitable for controlling the temperature of the combustion gas. FIG. 3A schematically shows only the vicinity of the heat exchanger 5 in the waste carbide production facility of FIG.

The circulating fluid of the high-pressure boiler (waste heat boiler) 60 is converted into high-pressure steam by heat exchange with high-temperature combustion gas.
Power can be supplied through a high-pressure steam header and a power generation turbine. FIG. 3B shows an example of an arrangement of a high-pressure boiler (waste heat boiler) that exchanges heat with combustion gas and power generation equipment. Note that a high-pressure boiler (waste heat boiler) 60 is provided downstream of the heat exchanger 5 for exchanging heat between the combustion gas and the refuse drying generated gas.
Heat exchanger 50 consisting of heat transfer tubes 50B with fins for heat exchange between the combustion gas after heat exchange with the refuse drying gas and the high-pressure boiler circulating fluid to further improve thermal efficiency Is preferred. The heat exchanger 50 of such a high-pressure boiler is disposed in series with the heat exchanger 5 of the combustion gas and the refuse generated gas, so that it is discarded as excess heat. The waste heat of the burned combustion gas can be recovered, and the heat recovery rate is further improved.

Next, FIG. 2 shows another example of the waste carbide manufacturing equipment of the present invention. The reference numerals in FIG.
Indicates the same content as. In addition, the manufacturing equipment of the garbage carbide and the manufacturing process of the garbage carbide of the present invention shown in FIG. 2 are the manufacturing equipment of the molded garbage, and the manufacturing equipment of the garbage carbide shown in FIG. 1 and FIG. It is the same as the manufacturing process.

As shown in FIG. 2, in the present invention,
It is also preferable that the refuse is crushed or crushed by the crusher 12, formed by the forming machine 2, and then dried by the dryer 1 to dry-distill and carbonize the refuse to produce refuse carbide. In the present invention, as shown in FIGS. 1 and 2, it is preferable to add an alkali agent such as slaked lime as a part of the raw material of the molded waste.

This is because the addition of an alkaline agent as a part of the raw material of the refuse solid fuel promotes dechlorination and desulfurization during dry distillation and carbonization. Further, in the present invention, as shown in FIGS. 1 and 2 described above, a pure oxygen and / or oxygen-enriched air supply pipe 4D for blowing pure oxygen and / or oxygen-enriched air into the dry distillation gas combustion device 4 is provided. In addition, pure oxygen and / or oxygen concentration
Preferably, more than 21 vol% of oxygen-enriched air is mixed.

This is because, by blowing pure oxygen and oxygen-enriched air into the carbonized gas combustion device 4, it becomes possible to achieve higher-temperature combustion in the carbonized gas combustion device 4 and further facilitate the generation of dioxins. This is because it can be suppressed. The present invention has been described above. According to the present invention, the following excellent effects (1) to (4) can be obtained.

(1) It is possible to produce a carbide that can be used as a carbon material by using garbage such as municipal garbage, household garbage, and general waste as a raw material. Also, the weight of garbage is about 1/8 of the original garbage
Becomes As a result, it is possible to reduce the volume of the solid fuel, which is about half the weight of the waste, by about 1/4, and the transport of the produced carbon material becomes easy.

By using the garbage carbide as a substitute for coke and coal in blast furnaces at steelworks, kilns at cement plants, and the like, the ash in the garbage can be
It can be used as a component in products such as slag and cement. (2) It is possible to drastically reduce the amount of fuel used when manufacturing refuse molded products (refuse solid fuel).

That is, it has become possible to reduce the fuel required as a drying heat source in the conventional solid waste fuel conversion equipment to about 1/3. (3) The combustion gas generated in the carbonization gas combustion device is used for heating the waste gas generated, and the waste heat can be effectively recovered without discarding the remainder as excess heat.

(4) A closed system for the refuse drying generated gas is formed, thereby preventing harmful substances contained in the refuse from being discharged out of the system. (5) The generation of dioxins can be suppressed.

[0051]

According to the present invention, it is possible to greatly reduce the amount of fuel used in the production of refuse molded products (: refuse solid fuel) and to effectively utilize the obtained refuse molded products (: refuse solid fuel). It has become possible to provide a method and a facility for producing a refuse carbide capable of suppressing generation of dioxins as well as making the refuse carbide possible.

[Brief description of the drawings]

FIG. 1 is a process chart showing an example of a waste carbide production facility of the present invention.

FIG. 2 is a process chart showing an example of a waste carbide production facility of the present invention.

FIG. 3 is a process diagram showing an example of a heat exchange device in the waste carbide production facility of the present invention.

FIG. 4 is a process diagram of a conventional solid waste fuel conversion facility.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Dryer 1A Hot-blast stove 1B Fuel 2 Molding machine 3 Drying / carbonization furnace 3A Waste storage hopper for refuse 3B Storage hopper for waste carbonization 4 Drying gas combustion device (: Drying gas combustion device) 4A Burner (: Afterburner) 4B Combustion air supply header 4C Combustion air fan 4D Pure oxygen, oxygen-enriched air supply pipe 5 Heat exchanger (indirect heat exchanger) 5A, 5B Heat transfer tubes with fins 6, 6a, 6b Circulation piping system for waste gas generated 7a, 7b Dust drying generated gas supply piping system 8 Pipe for supplying carbonized gas combustion gas to combustion gas quenching device (bypass pipe for combustion gas) 9 Air supply pipe to combustion gas in heat exchanger 10 Bag breaker and foreign matter separator 11 Magnetic separator 12 Crusher 13 Alkaline agent supply device 15 Garbage drying generated gas combustion device 15A fuel 16 Screw feeder 20 Combustion gas quenching device 21 Bag filter 22 Catalytic oxidation reaction of combustion gas 23 Main air blower 24 Cooling water treatment equipment 25 Supply pipe for heating air to the chimney 26 Air supply fan 27 Cooling water 30 Air blower 31 Heat exchanger 32 Heated medium 33 Sorter 40 Chimney 50 Boiler heat exchanger 50A, 50B Heat transfer tube with fin for boiler 60 High pressure boiler (waste heat boiler)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F23G 5/027 ZAB F23G 5/04 ZABD 5/04 ZAB 5/14 ZABF 5/14 ZAB B09B 3/00 ZAB (72) Inventor Yasuyuki Yamaguchi 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation (72) Inventor Koichi Shiozu 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation (72) Inventor Katsuyuki Nakanishi 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corporation (72) Inventor Sumio Yamada 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside Kawasaki Steel Corporation (72) Shigeru Watanabe 2-2-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation

Claims (14)

[Claims] A method for producing a refuse molded product obtained by drying and then molding refuse or a refuse molded product obtained by forming refuse and then drying the refuse obtained by drying. Then, the carbonized gas generated in the carbonization and carbonization process is burned, and the obtained combustion gas is exchanged for heat with the garbage drying generated gas generated by drying the garbage. A method for producing a refuse carbide, wherein a drying generated gas is circulated for drying the refuse. 2. The refuse carbide according to claim 1, wherein when the refuse drying generated gas is circulated for drying the refuse, the heated refuse drying generated gas is blown into the refuse. Manufacturing method. 3. The method for producing a refuse carbide according to claim 1, wherein a part of the refuse drying generated gas used for circulation is extracted and burned together with the dry distillation gas. 4. The method for producing refuse carbide according to claim 1, wherein the temperature of the obtained combustion gas is adjusted before heat exchange with the refuse drying generated gas. . 5. The method for producing refuse carbide according to claim 4, wherein the temperature control of the obtained combustion gas is an air supply to the obtained combustion gas. 6. The method for producing refuse carbide according to claim 4, wherein the temperature of the obtained combustion gas is adjusted by heat exchange with a circulating fluid of a boiler. 7. The refuse carbide according to claim 1, wherein heated air obtained by heat exchange between the room temperature air and the obtained combustion gas is supplied into a chimney. Production method. 8. A refuse dryer (1), a refuse molding machine (2) dried by the refuse dryer (1), and a refuse molding of the refuse molded product obtained by the refuse dryer (2). Carbonization furnace (3) and the carbonization / carbonization furnace
A combustion device (4) for the carbonized gas generated in (3), and the combustion device
A heat exchanger (5) for indirect heat exchange between the combustion gas generated in (4) and the refuse drying generated gas generated in the dryer (1), and refuse drying generated by the heat exchanger (5) Circulation piping system for refuse drying generated gas that circulates gas to the dryer (1)
(6) A refuse carbide production facility, characterized by having: 9. A refuse molding machine (2), a dryer (1) for a refuse molded product obtained by the refuse molding machine (2), and a refuse molded product dried by the refrigerator (1) And the carbonization furnace (3)
A combustion device (4) for the carbonization gas generated in the carbonization furnace (3); and a heat for indirect heat exchange between the combustion gas generated in the combustion device (4) and the refuse drying generated gas generated in the dryer (1). Exchanger (5)
And a circulating piping system (6) for the refuse drying gas supplied to the dryer (1) for circulating the refuse drying gas heated in the heat exchanger (5). Facility. 10. A circulating piping system (6) for refuse generated gas which circulates and supplies refuse dried gas heated in the heat exchanger (5) to the dryer (1). The refuse carbide production facility according to claim 8 or 9, wherein the circulating piping system supplies a drying generated gas to the refuse in the dryer (1) in a circulating manner. 11. A refuse drying gas supply piping system (7a, 7b) for supplying refuse drying gas generated in the dryer (1) to the dry distillation gas combustion device (4). A facility for producing refuse carbide according to any one of claims 8 to 10. 12. An air supply pipe (9) for supplying air for temperature adjustment to combustion gas generated in the combustion device (4) is provided in the heat exchanger (5). A facility for producing refuse carbide according to any one of items (8) to (11). 13. A heat exchanger (50) for a boiler, which performs heat exchange with generated combustion gas, for adjusting the temperature of the combustion gas, is provided in front of the heat exchanger (5). The facility for producing refuse carbide according to any one of claims (8) to (11). 14. A finned heat transfer tube (5B) for generating heated air is disposed in the heat exchanger (5), and the heated air generated by the finned heat transfer tube is supplied to a chimney. The facility for producing refuse carbide according to any one of claims (8) to (13), further comprising a supply pipe (25).