JP2000051816A - Method and apparatus for treating fly ash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and economically decompose hazardous substances in fly ash. SOLUTION: A heating apparatus 6 for heating fly ash A contg. dechlorination residue at a temp. where hazardous substances can be decomposed and in the presence of oxygen, a cooling and kneading apparatus 10 for cooling and kneading this heated fly ash A', a reactor 9 for collecting heavy metals from vaporized gas C generated in the heating apparatus 6 and an exhausting apparatus 5 for exhausting the vaporized gas G from which these heavy metals are removed are provided and in the heating apparatus 6, at least one of amine chemicals or reducing sulfur chemicals may be fed.

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 device for treating fly ash, a waste treatment method and a waste treatment device, and more particularly to an exhaust gas discharged from a refuse incinerator, a blast furnace, a coal-fired boiler, etc. Incineration of waste (general waste such as municipal waste from homes and offices, waste plastic, car shredder dust, waste office equipment, electronic equipment, industrial waste such as chemicals, etc., including combustible materials) TECHNICAL FIELD The present invention relates to a method and an apparatus for treating fly ash to be removed from waste gas, and a waste treatment method and a waste treatment apparatus.

[0002]

2. Description of the Related Art Conventionally, fly ash removed from exhaust gas obtained by incinerating wastes includes organic chlorine compounds such as dioxins,
A harmful substance such as heavy metal is contained, and a device proposed in, for example, Japanese Patent Application Laid-Open No. 8-14147 is known as a device for decomposing these. This is because ash is decomposed by heating fly ash at a temperature of 400 ° C. or more under oxygen deficiency (inert gas atmosphere) and maintaining this high temperature state for 30 minutes or more to decompose harmful substances and decompose organic chlorine compounds. Means, an ash cooling supply path for cooling the fly ash heated by the ash thermal decomposition means in a state of lack of oxygen, and discharging a predetermined amount at a time, and receiving fly ash from the ash cooling supply path to supply humidified water. A kneading means for cooling and kneading, and a heavy metal stabilizer supply means for supplying a heavy metal stabilizer to fly ash in the kneading means, and evaporative gas discharged by the ash thermal decomposition means and the kneading means To the precipitation treatment means,
This is a so-called closed-system fly ash processing facility configured to supply the gas after the precipitation treatment to the ash pyrolysis device through a gas circulation pipe after removing heavy metals in the evaporative gas.

[0003]

However, in the above-mentioned conventional processing equipment, since the fly ash is heated with insufficient oxygen, it is necessary to perform the entire equipment in a closed system. Therefore, additional equipment such as an inert gas replenishment tank is required to maintain the sealing performance.The heat transfer of the ash is rate-limiting, the entire equipment becomes large, the installation area increases, and the operation and arrangement of the equipment become complicated. There is a problem of doing.

[0004] Further, when fly ash is heated with insufficient oxygen, it takes time to heat the fly ash and decompose the dioxin, so that the heating apparatus itself becomes large and the amount that can be treated per unit time is limited.

It is an object of the present invention to efficiently and economically remove harmful substances, especially dioxins, in fly ash.

[0006]

The above object is achieved as follows.

The invention according to claim 1 includes a heating step of heating fly ash at a temperature at which harmful substances can be decomposed and in the presence of oxygen.
A cooling and kneading step of cooling and kneading the heated fly ash, a collecting step of collecting heavy metals from the evaporative gas generated in the heating step, and a discharging step of discharging the evaporative gas from which the heavy metals have been removed. It is a method of processing fly ash.

[0008] The term "in the presence of oxygen" as used herein means air supply means for positively supplying air to the heating step or air supply means for opening one end to the atmosphere and connecting the other end to the heating step. It refers to the state of

In the above fly ash treatment method, since the fly ash is heated in the presence of oxygen (air atmosphere), the required space and cost of the entire facility can be greatly reduced as compared with a closed system heating means. Also, operation management is relatively easy. In addition, since the fly ash is heated in the presence of air, a heater having a high heat transfer effect can be adopted, so that the fly ash can be heated in a short time and the decomposition reaction of dioxins in the fly ash is further promoted. In addition, the processing amount per unit time can be greatly increased, and the heating device can be downsized. In addition,
In a closed heating device, the heat treatment of fly ash takes more than 30 minutes, whereas in an open heating device according to the present fly ash treatment method, heating is performed in the presence of oxygen, so that the reaction rate is remarkably accelerated. Processing can be performed in about 10 minutes.

[0010] Further, the invention according to claim 2 is a method for treating fly ash, wherein a chemical is supplied to the heating step. In the heating process due to the specific decomposition action of the supplied drug,
Can quickly decompose fly ash harmful substances.

Further, the invention according to claim 3 is a method for treating fly ash, wherein the chemical is at least one of an amine chemical and a reduced sulfur chemical. This amine-based agent or reduced sulfur-based agent can be used to prevent resynthesis of dioxins in fly ash, and can contribute to an improvement in the removal rate of dioxins.

The invention according to claim 4 is a method for treating fly ash, wherein the fly ash contains a desalination residue. Fly ash containing desalted residue is particularly generated from exhaust gas, and even with such fly ash, harmful substances contained in the desalted residue in the fly ash can be quickly removed.

[0013] Further, the present invention provides a heating device for heating fly ash at a temperature capable of decomposing harmful substances and in the presence of oxygen, a cooling and kneading device for cooling and kneading the heated fly ash, A fly ash processing apparatus, comprising: a reactor for collecting heavy metals from the evaporative gas generated by the heating device; and a discharge device for discharging the evaporative gas from which the heavy metals have been removed.

Since the fly ash processing apparatus heats the fly ash in the presence of oxygen (air atmosphere), the required space and cost of the entire facility can be greatly reduced as compared with the closed heating means. Also, operation management is relatively easy. Further, since the fly ash is heated in the presence of air, a heater having a high heat transfer effect can be employed, and the fly ash can be heated in a short time. Since the decomposition reaction of dioxins in fly ash is further promoted, the throughput per unit time can be greatly increased, and the heating device can be downsized. It should be noted that while the heating process of fly ash takes 30 minutes or more in the closed heating device, the open ash heating device of the present fly ash processing device can perform the treatment in about 5 to 10 minutes.

Further, the invention according to claim 6 is the fly ash processing apparatus, wherein the heating device has a chemical supply means for supplying at least one of an amine-based chemical and a reduced sulfur-based chemical. The amine-based drug or reduced sulfur-based drug supplied by the drug supply means can prevent resynthesis of dioxins in fly ash and contribute to an improvement in the dioxin removal rate.

The invention according to claim 7 is the apparatus for treating fly ash, wherein the fly ash contains a desalination residue. Fly ash containing desalted residue is particularly generated from exhaust gas, and even with such fly ash, harmful substances contained in the desalted residue in the fly ash can be quickly removed.

According to the present invention, the waste is thermally decomposed to generate a pyrolysis gas and a pyrolysis residue mainly composed of a non-volatile component, and the pyrolysis residue is incombustible with a combustible component. After being separated into volatile components, the pyrolytic gas and the combustible components are burned to form molten slag and exhaust gas, fly ash is removed from the exhaust gas, and the fly ash is used as the fly ash according to any of the preceding. A waste disposal method characterized by treating the waste according to the above method. Fly ash removed from the exhaust gas generated by pyrolyzing and melting the waste is treated by the fly ash treatment method described above, thereby improving the waste treatment efficiency.

According to a ninth aspect of the present invention, there is provided a pyrolysis reactor for pyrolyzing waste to generate a pyrolysis gas and a pyrolysis residue mainly composed of a non-volatile component, and burning the pyrolysis residue. A combustion melting furnace for supplying and burning the pyrolysis gas and the combustible component to discharge molten slag and exhaust gas after separating into a volatile component and a non-combustible component, and an exhaust gas for removing fly ash from the exhaust gas A waste treatment device comprising a purifier, wherein fly ash removed by the exhaust gas purifier is treated by the fly ash treatment device according to any one of the above. Fly ash removed by the exhaust gas purifier of the waste treatment device is treated by the fly ash treatment device described above, and the treatment efficiency of the waste treatment device is improved.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fly ash processing method and apparatus according to an embodiment of the present invention;

FIG. 1 is a system diagram illustrating a first embodiment of a fly ash processing method or apparatus according to the present invention. Hereinafter, the fly ash processing device of the first embodiment will be described.
The exhaust gas G ₂ discharged from the incinerator 1 is supplied to the desalinating agent supply device 3.
The desalinating agent 4 is further added, and the fly ash in the exhaust gas is
After the removal of harmful substances such as hydrogen chloride and sulfur oxides,
It is discharged from the chimney 5 as a clean exhaust gas G _3. The desalting agent 4 is, for example, slaked lime. The exhaust gas purifier 2 includes, for example, an electric dust collector or a bag filter that removes fly ash in the exhaust gas with a filter cloth.

The fly ash A that is removed from the exhaust gas G ₂ by the exhaust gas purifier 2 is supplied to the heating device 6, capable of decomposing the harmful substances temperature, usually 350 to 550 ° C., preferably from 400 to 500 ° C. Heated. In this heating, air B is supplied by a blower 7, and at this time, the oxygen concentration in the evaporative gas C described later is 5 to 18% by volume.
(VOL%), preferably 8 to 13% by volume. The heating device 6 may be any ordinary heating means that discharges the supplied fly ash A while heating and stirring it. For example, a stirring blade that is rotationally driven through a stirring shaft in a casing having the heating means. And a mechanism that feeds fly ash A from one end to the other end, or a type in which fly ash is charged into a kiln-type retort (cylindrical tube) and agitated toward an outlet by rotation.

The evaporative gas C generated from the fly ash A heated by the heating device 6 is led to a reactor 9 via an induction blower 8 to remove harmful substances, and then becomes a clean exhaust gas G ₄ to be discharged. , For example, from the chimney 5 to the atmosphere.
The reactor 9 is composed of ordinary equipment for adsorbing or decomposing harmful substances such as dioxins and heavy metals in the evaporative gas C, for example, an activated carbon adsorption tower, a catalytic reaction tower and the like.

The fly ash A ′ from which harmful substances such as dioxin are decomposed by the heating device 6 is introduced into the cooling and kneading device 10. The cooling and kneading apparatus 10 includes kneading and extruding means such as a paddle that is rotationally driven via a rotating shaft in a casing.
Then, water 12 for quenching is supplied from the water supply device 11 to the cooling and kneading device 10, and is rapidly cooled to a temperature at which the dioxins of the fly ash A ′ are prevented from being resynthesized, for example, 100 ° C. or less. Further, the cooling and kneading device 10 includes a heavy metal fixing agent supply device 1.
The heavy metal fixing agent 14 is supplied from 3. If necessary, a solidifying material such as cement can be supplied. The fly ash A "processed by the cooling and kneading apparatus 10 is discharged and subjected to landfill disposal and the like.

FIG. 2 is a system diagram for explaining a fly ash processing method or apparatus according to a second embodiment of the present invention. Hereinafter, a fly ash processing apparatus according to the second embodiment will be described.
The same reference numerals as those in FIG. 1 indicate the same names. The apparatus for treating fly ash according to the second embodiment includes, in addition to the apparatus for treating fly ash according to the first embodiment, an amine-based drug 1 from the drug supply towers 15 and 17.
6. At least one of the reduced sulfur-based chemicals 18 is heated by the heating device 6.
Is provided with a medicine supply means for supplying the medicine to the patient.

The above-mentioned amine 16 and reduced sulfur 1
The total amount supplied to the heating device 6 which is a single or mixed 8 is 0.5 to 8% by weight, preferably 1 to 3% by weight, based on the fly ash to be heated. As shown in Table 1, dioxins in fly ash heated by adding an amine-based agent and a reduced sulfur-based agent were 0.05 ng / g, and when these agents were not added (dioxin concentration 1. 21n
g / g), the amount of dioxin can be significantly reduced. If the content of these agents is less than 0.5% by weight, the effect of suppressing the resynthesis of dioxin is low. If the amount exceeds 8% by weight, the effect is not changed. It can be seen that the processing amount is increased, which is not preferable.

[0026]

[Table 1]

In the fly ash processing apparatus of the second embodiment shown in FIG. 2, the structure and operation of the other parts are the same as those of the first embodiment shown in FIG.
The description is omitted because it is the same as that of the embodiment.

[0028] In the first, fly ash processing apparatus of the second embodiment, fly ash A is is set to fly ash containing residue after desalting denitration in exhaust converter 2, just removed from the exhaust gas G ₂ The same effect can be obtained by introducing only fly ash (dust) to the heating device 6.

Further, in the fly ash processing apparatus of the first and second embodiments, the air B is positively introduced into the heating device 6. For example, one end is opened and the other end is heated by the heating device 6. An air pipe extending inside may be connected to maintain the air circulation state. In this case, the evaporative gas C in the heating device 6 is drawn by the induction blower 8 for guiding the evaporative gas C to the reactor 9. Air will flow. Further, by adjusting the amount of evaporative gas suctioned by the induction blower 8, the amount of air flowing into the heating device 6 can be controlled. In any case, the inside of the heating device 6 is set to an air atmosphere so that the reaction of the amine-based drug for preventing the resynthesis of dioxin can be promoted.

In addition, according to the fly ash processing apparatus of the first and second embodiments, the fly ash A is heated in the heating device 6 in the presence of air or in the flow of air, so that There is no need for equipment such as equipment for maintaining the sealing property or pressure control of the equipment in the system, the entire equipment can be reduced in size, and operation and maintenance are relatively easy.

In addition, particularly in the second embodiment, since the inside of the heating device 6 is in an air atmosphere, the amine-based agent and the reduced sulfur-based agent conventionally used for the purpose of preventing the resynthesis of dioxins in the gas are used. Can be used to prevent resynthesis of dioxins in fly ash, and has a great effect in preventing resynthesis of dioxins.

Next, a method of treating fly ash according to the first embodiment will be described with reference to FIG. The fly ash treatment method of the first embodiment includes a heating step of heating the fly ash in a heating device 6 at a temperature capable of decomposing harmful substances and in the presence of oxygen.
The cooling and kneading step of cooling and kneading the heated fly ash performed in the cooling and kneading apparatus 10, the collection step of collecting heavy metals from the evaporative gas C generated in the heating step performed in the reactor 9, and the chimney 5 Evaporated gas G ₄ from which this heavy metal has been removed through
And a discharge step of discharging the wastewater. Here, fly ash A
May contain a desalination residue.

The fly ash processing method according to the first embodiment employs fly ash A
Since the heating is performed in an air atmosphere, the required space and cost of the entire facility can be significantly reduced as compared with the closed heating means, and operation management is relatively easy. Also,
Since a heater having a high heat transfer effect can be adopted, fly ash A can be heated in a short time, and the decomposition reaction of dioxins in fly ash is further promoted, so that the throughput per unit time can be greatly increased. As a result, the heating device can be downsized. In addition, desalting residues in fly ash A can be quickly removed. Other configurations and operations of the fly ash processing method according to the first embodiment are the same as those of the fly ash processing apparatus according to the first embodiment, and thus description thereof will be omitted.

Next, a method of treating fly ash according to the second embodiment will be described with reference to FIG. The fly ash treatment method according to the second embodiment has a configuration and an operation of the fly ash treatment method according to the first embodiment. In addition, in the heating step performed by the heating device 6, the amine-based agent 16 and the reduced sulfur-based agent 18 are used. Is to be supplied. The amine-based agent 16 and the reduced sulfur-based agent 18 prevent the resynthesis of dioxins in fly ash and improve the removal rate of dioxins. Other configurations and operations of the fly ash processing method of the second embodiment are the same as those of the fly ash processing method of the first embodiment, and a description thereof will be omitted.

FIG. 3 is a system diagram for explaining an embodiment of a waste treatment method or a waste treatment apparatus employing the fly ash treatment method or treatment apparatus according to the present invention. Hereinafter, the waste treatment apparatus 50 will be described. The crusher 52 is a crusher of, for example, a two-axis shearing type disposed in a receiving yard, and waste a such as municipal solid waste is supplied to the crusher 52 by a first conveyor 51, for example, 150 mm square or less. Crushed. The crushed waste a is charged by a second conveyor 53 and supplied to a pyrolysis reactor 55 via a screw feeder 54. This pyrolysis reactor 5
5 is, for example, a horizontal rotary drum, the inside of which is kept in a low oxygen atmosphere by a sealing mechanism (not shown), and is heated by a heat exchanger 68 arranged on the downstream side of a combustion melting furnace 63 as a combustor. heating air is supplied from the line L _1.

The waste a supplied into the pyrolysis reactor 55 by the heated air is kept at 300 to 600 ° C., usually at 4 ° C.
It is heated to about 50 ° C. Thereby, this waste a
Is thermally decomposed, the thermal decomposition gas G _1, primarily to produce a pyrolysis residue b nonvolatile. Then, the pyrolysis gas G ₁ is generated in the pyrolytic reactor 55 and the pyrolysis residue b
And the pyrolysis gas G ₁
Combustion melting furnace 63 via line L ₂ is a pyrolysis gas pipe
Is supplied to the burner 62.

Although the pyrolysis residue b varies depending on the type of the waste a, in the case of municipal solid waste in Japan, according to the knowledge of the present inventors, most of the flammable components are relatively fine granules. 60% Relatively fine ash content 5-40% Coarse metal component 7-50% It was found that it was composed of 10-60% such as coarse rubble, pottery and concrete.

Pyrolysis residue b having such components
Is discharged at a relatively high temperature of about 450 ° C., and is cooled to about 80 ° C. by the cooling device 57 and guided to the separating device 58, where it is separated into the combustible component c and the non-combustible component d. As the separation device 58, for example, a known separator of a magnetic separation type, a centrifugal type, or a wind separation type is used. The combustible component c from which the non-combustible component d has been separated and removed as described above is supplied to the pulverizer 6.
0 is supplied. The crusher 60 is suitably of a roll type, a tube mill type, a rod mill type, a ball mill type, or the like, and is appropriately selected depending on the properties of the waste to be treated.

[0039] Then, the combustion component c in this grinder 60 is preferably ground to all 1mm or less, the ground combustible component c is supplied to the burner 62 of the burning melting furnace 63 via line L ₃ You. On the other hand, the combustion air and the pyrolysis gas G ₁ supplied from the line L ₄ by the blower 61 and the combustible component c are heated at 1300 ° C. in the combustion melting furnace 63.
Combustion in a high temperature range of about
The combustion ash generated from the relatively fine ash of the above melts to form molten slag f.

The non-combustible component d is stored in the container 59. Unburned waste e is fed towards the possible under the combustion melting furnace 63 through a line L _5. At this time, the non-combustible waste e is 1 m in order to improve the combustion and melting efficiency.
m or less and preferably heated. Therefore, crusher provided in line L _5, crush provided a pulverizer 64 and heater 65, is good is supplied to the combustion melting furnace 63 is a process such as grinding and heating.
Therefore, heated air heated by the heat exchanger 68 disposed on the downstream side of the combustion melting furnace 63, and is supplied to the heater 65 via a line L _8.

Further, the non-combustible waste e is melted in the combustion melting furnace 63 to become slag g, mixed with the molten slag f formed by the combustion ash, dropped from the slag discharge port 66 into the water tank 67 and granulated. It is slag. The granulated slag is formed into blocks or formed into granules in a predetermined shape by a device (not shown), and can be reused as a building material or a pavement material. In this case, the non-combustible waste e may be mixed into the molten slag f without melting if necessary.

The combustion melting furnace 6 of such a waste disposal apparatus
The exhaust gas G ₂ generated in Step 3 is recovered by the heat exchanger 68 and further recovered by the waste heat boiler 69 from the line L ₆ , and then the fly ash a ′ is removed by the first exhaust gas purifier 2. and, by adding 4 desalting desulfurizing agent, desalted and desulfurization in the second exhaust gas treatment unit 2 'after exhausting the fly ash a, including Datsushiozan渣, cold clean gas G _3, and the attraction The air is discharged from the chimney 5 through the blower 20 to the atmosphere. A part of the exhaust gas G ₃ are supplied to the cooling device 57 via a line L ₇ by the blower 21.

The steam generated by the waste heat boiler 69 is sent to a steam turbine of a generator 70 to perform work.

[0044] In this waste treatment apparatus, some or all of the fly ash a 'trapped by the first exhaust gas treatment unit 2 is supplied to the heating device 6 by the line L _10, the remaining fly ash It returned to the combustion melting furnace 63 by a line L ₉ is
It is melted and carried out as slag. Or fly ash a '
May be returned to the combustion melting furnace 63 in some cases.

The flue gas from which fly ash has been removed by the first flue gas treatment means 2 is added with a desalinating agent 4 and subjected to desalination treatment by the second flue gas treatment means 2 ′. fly ash a containing is supplied to the heating device 6 by the line L _11.

In the heating device 6, air B is introduced, and at least one of the amine-based agent 16 and the reduced sulfur-based agent 18 or a mixture thereof is supplied to fly ash A (fly ash A).
And / or fly ash a ′)
A temperature at which dioxins can be decomposed, in this example, 400 to
Heat fly ash at 500 ° C.

Further, the evaporation gas C generated by the heating of fly ash A is led to the activated carbon adsorption tower 9 by the line L ₁₂ through the inducement blower 8, dioxins other harmful substances traces contained in the off gas C After removal, it is released to the atmosphere.

The fly ash A 'treated by the heating device 6
Is a temperature which is guided to the cooling and kneading apparatus 10 and which prevents the resynthesis of dioxins by the supply of water 12;
It is quenched below ℃. At the same time as the rapid cooling, the heavy metal fixing agent 14 is supplied from the heavy metal fixing agent supply device 13 into the cooling kneading device 10, so that the cooling kneading device 10 can be used as a kneading machine. As the heavy metal fixing agent, either a chelating agent or an inorganic agent can be used. The fly ash A ″ detoxified by the cooling and kneading apparatus 10 is then appropriately
Used for landfill disposal.

Next, an embodiment of a waste disposal method will be described with reference to FIG. Waste treatment method of the present embodiment, the waste a generates a pyrolysis residue b consisting mainly non-volatile components and the pyrolysis gas G ₁ by thermal decomposition, pyrolysis residue b combustible component c And the non-combustible component d, the pyrolysis gas G ₁ and the combustible component c are burned to form a molten slag f and an exhaust gas G _2, and fly ash a ′ and A are removed from the exhaust gas G ₂ , These fly ashes a ′ and A are processed by the above fly ash processing method. The waste disposal method of this embodiment improves waste disposal efficiency. Other configurations and operations of the present waste treatment method are the same as those of the waste treatment apparatus described above, and thus description thereof will be omitted.

[0050]

According to the fly ash treatment method of the present invention, the fly ash is heated in the presence of air, so that the heat treatment time can be greatly reduced, and the amount of fly ash heat treated per unit time is greatly increased. Can be increased. Furthermore, since an amine-based agent or a reduced sulfur-based agent for preventing the resynthesis of dioxins is supplied, the amount of dioxins in fly ash and residues finally released to the atmosphere is greatly reduced.

According to the apparatus for treating fly ash of the present invention,
In addition to the same effects as the above fly ash treatment method, the size of the heating device can be reduced, the installation area of the entire equipment can be reduced, and the operation and maintenance of the equipment can be simplified.

According to the waste disposal method of the present invention,
By employing the above fly ash treatment method, it is possible to remove harmful substances, particularly dioxins, generated by treating waste, and to improve the efficiency of waste treatment.

According to the waste disposal apparatus of the present invention, the same effects as those of the above-mentioned waste disposal method can be obtained by employing the above fly ash treatment apparatus.

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating a fly ash processing method or apparatus according to a first embodiment of the present invention.

FIG. 2 is a system diagram illustrating a fly ash processing method or apparatus according to a second embodiment of the present invention.

FIG. 3 is a system diagram illustrating an embodiment of a waste treatment method or a waste treatment device employing a fly ash treatment method or treatment device according to the present invention.

[Explanation of symbols]

2 Exhaust gas purifier 2 'Second exhaust gas purifier 5 Chimney (discharge device) 6 Heating device 9 Reactor 10 Cooling and kneading device 11 Water supply device 12 Water 13 Heavy metal fixing agent supply device 14 Heavy metal fixing agent 15 Chemical supply tower 16 Amine system drug 17 drug supply tower 18 reduced sulfur based agent 50 waste treatment apparatus 55 the pyrolysis reactor 63 the combustion melting furnace A, A ', A ", a' fly ash B air C vapor G ₁ pyrolysis gas G ₂ gas G ₄ Clean exhaust gas a Waste b Pyrolysis residue c Flammable component d Non-flammable component e Non-flammable waste f, g Molten slag

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23J 1/00 F23J 1/00 A B09B 3/00 302Z 304G (72) Inventor Hideaki Fujiyoshi Kawasaki, Kawasaki, Kanagawa Prefecture 10-6 Yotsuya-Kamicho, Ward F-term in Japan Environmental Health Center (reference) 3K061 AA07 AB02 AB03 AC01 BA05 BA10 CA01 CA07 DA12 DB06 FA03 FA08 FA10 FA21 NA02 NA07 NA18 3K078 AA05 AA10 BA03 BA26 CA02 CA21 CA24

Claims (9)

[Claims] 1. A heating step of heating fly ash at a temperature at which harmful substances can be decomposed and in the presence of oxygen; a cooling kneading step of cooling and kneading the heated fly ash; and the evaporation generated in the heating step A method for treating fly ash, comprising: a collecting step of collecting heavy metals from a gas; and a discharging step of discharging evaporated gas from which the heavy metals have been removed. 2. A method for treating fly ash according to claim 1, wherein a chemical is supplied to said heating step. 3. The method for treating fly ash according to claim 2, wherein the chemical is at least one of an amine chemical and a reduced sulfur chemical. 4. The method for treating fly ash according to claim 1, wherein said fly ash contains a desalination residue. 5. A heating device for heating fly ash at a temperature at which harmful substances can be decomposed and in the presence of oxygen, a cooling and kneading device for cooling and kneading the heated fly ash, and evaporation generated by the heating device. An apparatus for treating fly ash, comprising: a reactor for collecting heavy metals from a gas; and a discharge device for discharging an evaporated gas from which the heavy metals have been removed. 6. The apparatus for treating fly ash according to claim 5, wherein said heating device has a chemical supply means for supplying at least one of an amine-based drug and a reduced sulfur-based drug. 7. The fly ash processing apparatus according to claim 5, wherein the fly ash includes a desalination residue. 8. Pyrolysis of waste to generate a pyrolysis gas and a pyrolysis residue mainly composed of non-volatile components, and after separating the pyrolysis residue into a combustible component and a non-combustible component. The method for treating fly ash according to any one of claims 1 to 4, wherein the pyrolysis gas and the combustible component are burned to form molten slag and exhaust gas, and fly ash is removed from the exhaust gas. A waste disposal method characterized by treating the waste. 9. A pyrolysis reactor for pyrolyzing waste to produce a pyrolysis gas and a pyrolysis residue mainly composed of a non-volatile component, and a pyrolytic component and a non-combustible component for converting the pyrolysis residue to a combustible component and a non-combustible component. After being separated into, the combustion pyrolysis gas and the combustible component is supplied and burned to discharge a molten slag and an exhaust gas, and a flue gas purifier for removing fly ash from the exhaust gas, A waste treatment apparatus, wherein fly ash removed by an exhaust gas purifier is treated by the fly ash treatment apparatus according to any one of claims 5 to 7.