JP2001129511A - Apparatus for treatment of incineration ash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently treat incineration ash in order to suppress solubilities of various heavy metal substances to achieve its effective utilization by a method wherein unburned organic matter becoming a generation source of methane contained in the incineration ash (main ash and fly ash are contained) is removed, and decomposition and stabilizing treatment of dioxins are carried out. SOLUTION: An apparatus for treatment of incineration ash comprises a reception feed apparatus for transferred incineration ash; a dryer; a grinding apparatus; primary reaction equipment for carrying out a primary reaction process of heating dechlorination and thermal decomposition treatment of dioxins of pulverized dry incineration ash; secondary reaction equipment for carrying out a secondary reaction process of performing pulverization and decomposition of the incineration ash sent from the primary reaction equipment and stabilization and fixation of heavy metals or the like; bag-filling equipment for carrying out a measurement and bag-filling process of the incineration ash sent from the secondary reaction equipment; an exhaust gas treating equipment for carrying out an exhaust gas treating process such as dust collection, rapid cooling, adsorption, denitration, adsorption of the dioxins or the like of the exhaust gas; and rapid cooling equipment for feeding cooling water to a water cooled carrying conveyor 202 of the dryer and a water cooled carrying conveyor 407 of the primary reaction equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for treating incinerated ash generated during incineration of, for example, municipal waste, sewage sludge, and other industrial wastes. The present invention relates to an incineration ash processing device capable of efficiently processing incineration ash (including “main ash” and “fly ash”) and effectively utilizing the same.

[0002]

2. Description of the Related Art Conventionally, incineration ash generated during incineration of municipal garbage, sewage sludge, and other industrial wastes is partially replaced with cement filler or aggregates such as blocks, and furthermore, with incineration ash. After being melted, it has been used as a roadbed material or the like, but most of it has been landfilled.

[0003]

However, in recent years,
It is becoming difficult to secure landfills, and incinerated ash
Usually, it contains dioxins such as dioxins and dibenzofurans and heavy metals such as chromium, mercury, lead, and cadmium, and the disposal standards are strict from the viewpoint of water pollution by such dioxins and heavy metals. Cost-managed landfills are required,
There is a problem that it is difficult to use. Therefore,
Today, the safety treatment of the incinerated ash is a very important issue.

[0004] By performing incineration ash safety treatment,
This can be used as an auxiliary material for cement. However, incinerated ash contains CaO, SiO ₂ , Al ₂ O ₃ , Fe ₂
Although it contains a lot of active ingredients of cement such as O ₃ ,
On the other hand, it contains a large amount of alkali components such as K ₂ O and Na ₂ O and chlorine components such as Cl, and it is not preferable to use this as it is as a cement material. Even if it is going to treat incineration ash as it is with the latest baking equipment, not only the above-mentioned alkali component and chlorine component adhere to a heater and a sensor, etc., but also it becomes impossible to perform a stable operation, such as blocking, Incinerated ash causes alkali-aggregate reaction, corrosion of reinforcing steel due to chlorine, and the like, and there is a problem in directly using it as a cement auxiliary material. Furthermore, incinerated ash contains a large amount of unburned organic matter and heavy metal compounds, and even if an attempt is made to adopt the cement solidification method, which is an appropriate treatment method, methane gas is generated from the unburned organic matter in a short time and the solidified matter is destroyed. In addition, harmful heavy metals elute from the damaged part, and there is a problem in maintaining the environment.

[0005] In general, currently operating incinerators emit a small amount of incinerated ash completely burned, contain a large amount of unburned organic matter, and even when solidified as cement, etc., may cause methane gas and the like. Significantly accelerates environmental pollution. Even if dioxins and other chlorine and alkali components are contained in the incinerated ash, even if they are solidified with cement as they are, the solidification will be damaged by alkali-aggregate reaction etc. in a short time, resulting in functional damage. It is thought that it is connected. Cadmium (Cd) in incineration ash
Also, heavy metals such as lead (Pd) dissolve in activated state in rainwater even when solidified with cement, and cannot be used or discarded as it is.

It is known that dioxins float when left in an atmosphere of about 600 ° C. or higher while being ionized by carbon, oxygen, chlorine and the like of the constituent elements. The component elements in this state have not been evaluated as dangerous substances. However, it is known that when gradually cooled, it is regenerated and becomes highly toxic.

Further, among heavy metals, elements mainly collected in the sulfide phase on the earth, such as copper, silver, zinc, cadmium, mercury,
Lead and arsenic are considered harmful among heavy metals,
In nature, it is a principle that it exists stably as a sulfide. For example, zinc exists as a sphalerite with the compound ZnS as a natural ore, cinnabar as a mercury with a compound HgS as a natural ore, copper as a chalcopyrite as a compound Cu ₂ S, and lead as a galena as a compound PbS. However, the elements that collect in the sulfide phase in the incineration ash are artificially processed by incineration or the like, and are therefore compounds of other elements.

SUMMARY OF THE INVENTION In view of the above problems, the present invention has been made to solve the problems, and the object thereof is to include incinerated ash (including "main ash" and "fly ash"). ) Removes unburned organic matter, which is a source of methane, and decomposes and stabilizes dioxins.
Converted to sulfides existing in nature to suppress the solubility of various heavy metal substances and converted to stable incinerated ash, making effective use of incinerated ash as an auxiliary material such as cement, 800 ° C
It is an object of the present invention to provide an incineration ash treatment device which can easily and efficiently treat incineration ash at a temperature of up to 900 ° C. and can effectively utilize the incineration ash.

[Means for Solving the Problems]

In order to achieve the above object, the incineration ash treatment apparatus according to the first aspect of the present invention is a receiving apparatus for performing pretreatment steps such as storage, quantitative supply, particle size sorting, and magnetic force sorting of the incinerated ash. The drying process is performed by a high-temperature treatment of 800 to 900 ° C for the water removal of the incineration ash sent from the receiving and supplying equipment and the unburned incineration, and the outlet temperature is 200 ° C during the transportation by the water-cooled transportation conveyor. Drying equipment that performs a drying step of rapidly cooling below, and crushing equipment that performs crushing steps such as coarse crushing of dry incinerated ash sent from the drying equipment, iron sorting, non-ferrous metal sorting, and fine crushing to a particle size of 100 to 150 microns or less. And an additive containing calcium as a main component is added to the finely powdered dry incineration ash sent from the pulverizing equipment to form a low oxygen atmosphere at 80
A primary reaction facility that performs a primary reaction step of heat dechlorination and pyrolysis of dioxins by high-temperature treatment at 0 to 900 ° C. and rapidly cools to an outlet temperature of 200 ° C. or less during transport by a water-cooled transport conveyor; and Crushing the incinerated ash to a particle size of 100 to 150 microns or less, particle size 10
Addition of an additive which is a heavy metal stabilizing agent containing sulfide as a main component to incineration ash of 0 to 150 microns or less and treating temperature 1
A secondary reaction facility for performing a secondary reaction process such as stabilization and solidification of heavy metals by stirring and mixing under conditions of 80 to 200 ° C. and an oxygen concentration of about 6% in the furnace, and measurement of incineration ash sent from the secondary reaction facility Bagging equipment for bagging, exhaust gas treatment for exhaust gas collection, quenching, adsorption, denitration, adsorption of dioxins, etc., water-cooled conveyor for drying equipment and water cooling for primary reaction equipment And a cooling water facility for supplying cooling water to the conveyer to cool them. Here, incineration ash includes "main ash" and "fly ash"
including.

The additives added in the primary reaction step are calcium oxide 80%, aluminum hydroxide 5-10%.
%, Viscosity 10%, and 3% of the ash weight ratio is added. Additives added in the secondary reaction step are sodium sulfide 40%, silicon dioxide 10%, sodium carbonate 10%, calcium carbonate 10%, anhydrous borane 10%, calcium silicate 10
%, Activated iron oxide 5-10%, calcium sulfate 10%, 1% of ash weight ratio is added.

[0011]

By heating the incinerated ash, organic substances and dioxins which are methane sources are decomposed into carbon, oxygen, carbon dioxide, chlorine and activated. Among them, the chlorine component is combined with sodium (eg, Na, Ca, Kl, etc.), fixed as a stabilizing substance (eg, CaCl, etc.), and then quenched to prevent re-generation of dioxins. The sulfide reacts with the contained heavy metal oxides, and natural ores existing in nature (for example, mercury is cinnabar,
Cadmium is converted to cadmium sulfide ore, etc. to prevent elution of heavy metals, and incinerated ash is used as a cement auxiliary material.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the invention shown in the drawings. Here, FIG. 1 is a configuration diagram of the entire apparatus.

[0013] In the figure, the incineration ash processing apparatus is used for storing, quantitatively supplying, particle size sorting, and incineration ash conveyed by a transport vehicle.
Receiving and supplying equipment 10 for performing a pretreatment step such as magnetic separation, drying equipment 20 for performing a drying step such as removing moisture from incinerated ash sent from the receiving and supplying equipment 10 and incineration of unburned materials, and drying equipment 20
Crushing equipment 30 that performs crushing processes such as coarse crushing, iron separation, non-ferrous metal sorting, and fine crushing of the dry incinerated ash sent from the factory, and heating of the dioxins in the finely powdered dry incinerated ash sent from the crushing equipment 30 A primary reaction facility 40 for performing a primary reaction step of dechlorination and thermal decomposition treatment, a secondary reaction facility 50 for performing a secondary reaction step such as disintegration of incinerated ash sent from the primary reaction facility 40, and stable solidification of heavy metals, A bagging facility 60 for performing a measuring and bagging process of incinerated ash sent from the secondary reaction facility 50, and an exhaust gas treatment facility 70 for performing an exhaust gas treatment process such as dust collection, quenching, HCl adsorption, denitration, and dioxin adsorption of exhaust gas. , The water-cooled conveyor 202 of the drying equipment 20, the water-cooled conveyor 407 of the primary reaction equipment 40, and the exhaust gas treatment equipment 7.
A cooling water system 80 that supplies cooling water to the heat exchanger 702 of No. 0 and cools them.

The receiving and supplying facility 10 is a facility for performing pretreatment processes such as storage, quantitative supply, particle size sorting, and magnetic force sorting of incinerated ash conveyed by a transport vehicle. 103, a feed disperser 104, a vibrating screen 105, a conveyor 106, a magnetic separator 107, a conveyor 108, a conveyor 109, and the like.

The storage device 101 is a device for storing incinerated ash conveyed by a transport vehicle.
0 m ³ can be stored. The incinerated ash stored in the storage device 101 is discharged to the fixed amount supply device 102.

The fixed amount supply device 102 can arbitrarily change the supply amount of the incinerated ash, for example, from 1 t / h to 2.5 t / h, and determine the processing capacity of the equipment. The transport conveyor 103 is a conveyor for transporting the incinerated ash in the fixed quantity supply device 102 to the supply / dispersion device 104, and has a transport capacity of, for example, 2.5 t / h or more.

The supply disperser 104 is a device for dispersing the incinerated ash supplied to the vibrating sifter 105 by the transport conveyor 103 so as not to be agglomerated. It fulfills the function of improving the efficiency.

The vibrating sifter 105 is equipped with a screen having a mesh of 50 mm, for example.
Performs the function of excluding those with mm or more. Vibrating sieve 105
A conveyor 106 for conveying the incinerated ash that has passed through the sieve is provided below.

The magnetic separator 107 sorts and removes large irons such as empty cans and bolts from the incineration ash conveyed by the conveyor 106 after passing through the sieve of the vibrating sieve 105 to prevent obstacles in subsequent processes. It does the function of removing what is, but it cannot remove small pieces buried in the incineration ash, which are processed in a later step. As the magnetic separator 107, for example, a suspension type magnetic separator is used, and for example, a magnetic separator of 1 kW is used.

The transport conveyor 108 is a conveyor for transporting the incinerated ash from which the large iron has been removed by the magnetic separator 107 to the transport conveyor 109. The transport conveyor 109 is a conveyor that distributes the transported incinerated ash to the two drying facilities 20 and transports it.

The drying unit 20 is a unit that performs a drying process such as removing moisture from the incinerated ash sent from the receiving / supplying unit 10 and incineration of unburned components. The rotary kiln 201, the water-cooled transfer conveyor 202, the transfer conveyor 203, Tank 20
4, the service tank 205 and the like. The drying equipment 20 is provided with two identical equipments.

The rotary kiln 201 rolls the incinerated ash from one end to move in the axial direction, and heat-exchanges the incinerated ash with a gas at a processing temperature of 800 to 900 ° C.
Heat to dry. Thereby, the water in the incinerated ash is completely evaporated, and the unburned carbon is completely burned, so that the quality as a recycled material can be improved.

At this time, by heating at a treatment temperature of 800 to 900 ° C., measures against dioxins in exhaust gas can be taken. In addition, the waste heat generated at this time is
0 is sent to the primary reaction rotary kiln 406 and reused as a heat source for the primary reaction process. The throughput of one rotary kiln 201 is, for example, 0.5 to 1.3 t / h.
Two of them are used.

The water-cooled conveyor 202 is a conveyor that rapidly cools high-temperature incinerated ash discharged from the other end of the rotary kiln 201 during conveyance, cools it to an outlet temperature of 200 ° C. or less, and carries it out. The transport conveyor 203 is a conveyor that transports the dried incinerated ash cooled to 200 ° C. or lower by the water-cooled transport conveyor 202 to the crushing equipment 30 in the next step.

The fuel tank 204 is a rotary kiln 20
The service tank 205 stores fuel to be supplied to the rotary kiln 2 from the fuel tank 204.
01 is a tank provided for adjusting the fluctuation of the fuel supplied to 01.

The crushing equipment 30 roughly crushes the dried incinerated ash sent from the drying equipment 20, sorts iron, sorts non-ferrous metals,
Equipment for performing a pulverization process such as fine pulverization, which includes a crusher 301, a magnetic separator 302, a non-ferrous metal separator 303, and a conveyor 30.
4. Dry incineration ash tank 305, crusher feeder 306, crusher 307, crusher main fan 308, crusher cyclone 309, crusher dust collector 310, crusher vent fan 311, transfer conveyor 312, transfer conveyor 3
13 and the like. The crushing equipment 30 is provided with two identical equipments.

The crusher 301 roughly crushes the dried incineration ash sent from the drying equipment 20 in the preceding process to, for example, a particle size of 10 to 20 mm or less, and separates the metal from the dried incineration ash. For the crusher 301, for example, an impact type is used. The metal and the dry incineration ash roughly crushed by the crusher 301 are sent to the magnetic separator 302.

The magnetic separator 302 sorts and removes, from the metal and the dry incineration ash sent from the crusher 301, small pieces of iron that could not be removed by the receiving and supplying equipment 10, and has a magnetic force of, for example, 5000 gauss. Drum type magnetic separator is used. The non-ferrous metal from which iron has been removed by the magnetic separator 302 and the dried incineration ash are sent to the non-ferrous metal separator 303.

The non-ferrous metal sorter 303 sorts and removes the non-ferrous metal from the non-ferrous metal and the dry incineration ash sent from the magnetic separator 302. For example, an eddy current type is used. The dried incinerated ash from which the non-ferrous metal has been removed by the non-ferrous metal sorter 303 is sent to the dried incinerated ash tank 305 by the conveyor 304 and stored therein.

The crusher feeder 306 is used for drying the incinerated ash tank 3
This is a device for supplying a constant amount of the dried incinerated ash stored in the ash storage unit 05 to the crusher 307.

The crusher 307 is a device for finely crushing the dried incinerated ash supplied through the crusher feeder 306 to, for example, a particle size of 100 to 150 μm or less, for example, a roller mill. The processing capacity of one crusher 307 including a roller mill is, for example, 800 kg / h, and two crushers are installed.

The pulverizer 307 converts the dried incinerated ash to, for example, a particle size of 1.
By pulverizing to a size of less than 100-150 microns,
It functions to increase the surface area of the ash and to increase the reaction rate of the subsequent primary reaction treatment.

The main fan 308 for the crusher 30
Air is fed into the crusher 7 and the dried incinerated ash crushed into fine powder in the crusher 307 is sent to the crusher cyclone 309 together with the air.

The cyclone 309 for the pulverizer separates the fine powdered dry incineration ash that has flowed in with the air by using centrifugal force generated by the turning of the airflow, drops it down, discharges it from the lower end, and discharges it from the lower end. I do.

The dust collector 310 for the pulverizer is a device for collecting the floating dust in the cyclone 309 for the pulverizer, and the fine incineration ash contained in the dust is dropped downward and discharged from the lower end side.

The vent fan 311 for the crusher is a device for sucking and exhausting exhaust gas containing dust and the like inside the cyclone 309 for the crusher and the dust collector 310 for the crusher. Exhaust gas exhausted from the vent fan 311 for the pulverizer is sent to the activated carbon adsorption tower 705 of the exhaust gas treatment equipment 70, detoxified, and released from the chimney 707 to the atmosphere.

The conveyor 312 is disposed below the discharge port at the lower end of the cyclone 309 for the crusher and the dust collector 310 for the crusher, and conveys the fine incineration ash discharged from these to the conveyor 313. It is a conveyor. The transport conveyor 313 is a conveyor for transporting the finely powdered dried incinerated ash to the primary reaction facility 40 in the next step.

The primary reaction facility 40 is a facility for performing a primary reaction step of thermal dechlorination and pyrolysis of dioxins in the finely powdered dry incineration ash sent from the grinding facility 30. A supply device 402, transport conveyor 403, transport conveyor 404, transport conveyor 40
5, a primary reaction rotary kiln 406, a water-cooled transport conveyor 407, a transport conveyor 408, and the like. As the primary reaction equipment 40, two identical equipments are installed.

The pulverized raw material tank 401 is a tank for storing the finely powdered dry incinerated ash finely pulverized in the previous process, and the finely powdered dry incinerated ash stored in the pulverized raw material tank 401 is discharged from the lower end side to be conveyed. By 403, it is conveyed to the primary reaction rotary kiln 406.

The additive A supply device 402 is a rotary kiln 406 for the primary reaction of the additive A containing calcium as a main component.
The additive A of the additive A supply device 402 is supplied to the conveyor 4 for transporting the finely powdered dry incinerated ash.
03 is conveyed to the primary reaction rotary kiln 406.

The additive A contains a calcium compound as a main component and a function-improving catalyst added thereto, and is used for accelerating the reaction rate in the rotary kiln 406 for the primary reaction. Additive A is composed of, for example, 80% of calcium oxide CaO, 5 to 10% of aluminum hydroxide Al (OH) _{3, and} 10% of viscosity,
An amount of 3% of the ash weight ratio is added.

The rotary kiln 406 for the primary reaction rolls the incinerated ash and the additive A from one end so that they react while moving in the axial direction.
By the high temperature treatment of 00 to 900 ° C., the dechlorination of dioxins in the exhaust gas and the thermal decomposition reaction are advanced. The throughput of one primary reaction rotary kiln 406 is, for example, 0.5 to
1 t / h, two of which are used.

The water-cooled transport conveyor 407 is a conveyor for rapidly cooling the high-temperature incinerated ash discharged from the other end of the primary reaction rotary kiln 406 during transportation, cooling the incinerated ash to an outlet temperature of 200 ° C. or less, and carrying out the same. . The conveyor 408 is
This is a conveyor that conveys the incinerated ash cooled to 200 ° C. or lower by the water-cooled conveyor 407 to the secondary reaction facility 50 in the next step.

The secondary reaction equipment 50 is an equipment for performing secondary reaction steps such as crushing of incinerated ash sent from the two primary reaction equipments 40 and stable solidification of heavy metals, etc. 502, a primary incineration ash tank 503, an additive B supply device 504, a measuring hopper 505, a secondary reaction device 506, an air transporter 507, and the like.

The vibrating sieve 501 has a function of distributing incinerated ash, which is provided with a screen and sent from the primary reaction facility 40, to, for example, those having a particle size of 100 to 150 μm or more, by a screen sieve, to a crusher 502. . A primary incineration ash tank 503 for storing incineration ash that has passed through the sieve is installed below the vibrating sieve 501.

The crusher 502 converts the incinerated ash agglomerated in the primary reaction treatment of the primary reaction equipment 40 to a particle size of 100 to 150, for example.
It has the function of increasing the surface area of incinerated ash by crushing it to submicron size. The processing capacity per crusher 502 is 2
t / h, one of which is installed. Crusher 50
The incinerated ash cracked in step 2 is stored in a primary incinerated ash tank 503 installed below the crusher 502.

The measuring hopper 505 is provided with an incineration ash supplied from the primary incineration ash tank 503 and an additive B supply device 504.
Is a device for measuring the additive B supplied from the reactor, and the measured incinerated ash and the additive B are sent to the secondary reactor 506.

The additive B supply device 504 is a device for supplying additive B, which is a heavy metal stabilizing solidifier containing sulfide as a main component, to the secondary reaction device 506.
The additive B of No. 4 is measured by the measuring hopper 505 and sent to the secondary reaction device 506.

The additive B contains sulfide as a main component and is used to promote a stable solidification reaction of heavy metals in the secondary reactor 506. Additive B is, for example, sodium sulfide Na ₂ S
(40%), silicon dioxide SiO ₂ (10%), sodium carbonate Na ₂
CO ₃ (10%), calcium carbonate CaCO ₃ (10%), anhydrous borane B ₂ O ₃ (10%), calcium silicate CaSiO ₃ (10%), activated iron oxide Fe ₂ O ₃ (5-10%) , Calcium sulfate CaSO ₄ (10
%) And an amount of 1% of the ash weight ratio is added.

The secondary reaction device 506 includes the measuring hopper 50
The incinerated ash measured in 5 and the additive B were treated at a treatment temperature of 180
The stable solidification reaction of the heavy metal is progressed by stirring and mixing under conditions of about 200 ° C. and an oxygen concentration of about 6% in the furnace.
The throughput of the secondary reactor 506 is, for example, 2 t / h.

The pneumatic transporter 507 sends the incinerated ash treated in the secondary reactor 506 to the bagging equipment 60 in the next step. The incinerated ash discharged from the lower end of the secondary reactor 506 is transported by the pneumatic transporter. The inside of the machine 507 is sucked and sent to the product tank 601 of the bagging equipment 60 in the next process.

The bagging facility 60 is a facility for performing a step of measuring and bagging the incinerated ash sent from the secondary reaction facility 50, and includes a product tank 601, a bagging machine 602, a product carrying conveyor 603, and the like. .

The product tank 601 is a tank for storing the incinerated ash sent from the secondary reaction equipment 50, and the product tank 60
1 is provided with a fan for collecting and discharging dust in the tank. The product tank 601 is located below the product tank 601.
A bagging machine 602 for bagging the incinerated ash supplied from the company into a product is installed.

The bag filling machine 602 is a device for measuring the incineration ash in the product tank 601 and filling the bag with the incineration ash. The processing capacity of this bagging machine 602 is 5 t
1010t bags / h.

The product unloading conveyor 603 is a conveyor for unloading the incinerated ash that has been packed and commercialized by the bagging machine 602, and after unloading, the incinerated ash that has been packed and commercialized is loaded on a transport vehicle by a crane or the like. Be transported.

The exhaust gas treatment equipment 70 includes the primary reaction equipment 40
Is a facility for performing exhaust gas treatment processes such as dust collection, quenching, HCl adsorption, denitration, and dioxins adsorption of exhaust gas generated in the primary reaction rotary kiln 406, and includes a cyclone 701, a heat exchanger 702, a slaked lime blowing device 703, and a dust collector 704. ,
Activated carbon adsorption tower 705, exhaust attraction fan 706, chimney 70
7, a compressor 708 and the like.

Among them, cyclone 701 and heat exchanger 7
02, two slaked lime blowing devices 703 and dust collectors 704 are provided. On the other hand, an activated carbon adsorption tower 705, an exhaust air induction fan 706, a chimney 707, and a compressor 708 are provided.

The cyclone 701 collects the exhaust gas generated by the rotary kiln 406 for the primary reaction, separates the fine incineration ash that has flowed in with the air, and separates the fine incineration ash using centrifugal force generated by the turning of the air flow. Drop it down and discharge from the lower end. The discharged incinerated ash is transferred to the conveyor 40
4 and the transport conveyer 403 return to the primary reaction rotary kiln 406 for reprocessing.

The heat exchanger 702 is a device for rapidly cooling the exhaust gas discharged from the cyclone 701 to 200 ° C. or less, and has a function of preventing the generation of dioxins. The heat exchanger 702 rapidly cools the exhaust gas with cooling water supplied from the cooling water facility 80. For this heat exchanger 702, for example, a fire tube type is used.

The slaked lime blowing device 703 includes a heat exchanger 702
A device that sprays slaked lime onto the exhaust gas that has been quenched and exhausted by HCl, NO _X
Is adsorbed and removed. As the slaked lime blowing device 703, for example, a pneumatic pressure feeding type is used.

The dust collector 704 is a device for collecting dust in the exhaust gas floating in the cyclone 701, and drops fine incinerated ash contained in the dust downward and discharges it from the lower end. The discharged incinerated ash is transferred to the primary reaction rotary kiln 406 by the conveyor 405 and the conveyor 403.
And is reprocessed. For the dust collector 704, for example, a pulse air type bag filter is used.

The activated carbon adsorption tower 705 is connected to the exhaust gas discharged from the dust collector 704 and the vent fan 3 for the pulverizer.
Dioxins and NO _X from exhaust gas exhausted from 11
It is a device that detoxifies by adsorption removal. The activated carbon adsorption tower 705 has, for example, a cylindrical shape.
m ³ of activated carbon is filled, and the exhaust gas of 500 to 1500 h ⁻¹ is treated.

The exhaust fan 706 is connected to the activated carbon adsorption tower 70.
5 dioxins and NO _X is a device for exhausting by suction of exhaust gas which is harmless is adsorbed and removed by. For example, a turbo type is used for the exhaust induction fan 706, and its processing capacity is, for example, 20000 Nm ³ / h × 600 mmAq.

The chimney 707 discharges the exhaust gas exhausted from the exhaust induction fan 706 to the atmosphere. Compressor 70
Reference numeral 8 denotes a device that sends compressed air to the dust collector 704 of the exhaust gas treatment facility 70 and the dust collector 310 for the crusher of the crushing facility 30.

The cooling water equipment 80 includes a water-cooled transfer conveyor 202 of the drying equipment 20, a water-cooled transfer conveyor 407 of the primary reaction equipment 40, and a heat exchanger 702 of the exhaust gas treatment equipment 70.
This is a facility for supplying cooling water to the cooling water and cooling them, and includes a cooling tower 801, a water tank 802, a circulation pump 803, and the like.

The cooling tower 801 is provided with the water-cooled conveyor 20
2. The circulating water heated by cooling the water-cooled transfer conveyor 407 and the heat exchanger 702 is air-cooled and cooled. Water tank 802
Contains cooling water air-cooled in the cooling tower 801. The circulation pump 803 supplies and circulates the cooling water to the water-cooled transfer conveyor 202, the water-cooled transfer conveyor 407, and the heat exchanger 702.

Next, the operation based on the configuration of the above embodiment of the present invention will be described below. The incinerated ash carried by the carrier is temporarily stored in the storage device 101 of the receiving and supplying facility 10. The receiving and supplying facility 10 is a facility for performing pretreatment processes such as storage, quantitative supply, particle size sorting, and magnetic force sorting of the incinerated ash conveyed by the transport vehicle. The incinerated ash stored in the storage device 101 is supplied to the quantitative supply device 102. Is discharged.

The incinerated ash discharged to the fixed quantity supply device 102 is transported to the supply disperser 104 by the transport conveyor 103. In the supply disperser 104, the incinerated ash supplied to the vibrating sieve 105 by the transport conveyor 103 is dispersed so as not to be a lump, and then the incinerated ash is sent to the vibrating sieve 105.

The incineration ash sent to the vibrating sifter 105 is, for example, a screen having a mesh of 50 mm excluding the ash contained in the incineration ash of 50 mm or more. It is sent to the lower side of the magnetic separator 107 by the transport conveyor 106 installed on the lower side.

While the incinerated ash is being conveyed and passed below the magnetic separator 107 by the transport conveyor 106, large iron components such as empty cans and bolts are removed from the incinerated ash.
, And is separated and removed, thereby removing large iron which is an obstacle to a subsequent process. In this case, the small pieces buried in the incineration ash cannot be removed, and they are processed in a later step.

As described above, the incinerated ash that has been subjected to the pretreatment in the receiving / supplying facility 10 is distributed to one of the two drying facilities 20 by the transport conveyor 109 and sent to the next drying step.

The drying facility 20 is a facility for performing a drying process such as removing moisture from the incinerated ash sent from the receiving / supplying facility 10 and incinerating unburned components. The incinerated ash sent from the preceding process is supplied to the rotary kiln from one end. Inserted in 201. Fuel is supplied to the rotary kiln 201 from a fuel tank 204 and a service tank 205.

The incinerated ash inserted into the rotary kiln 201 is heated at a processing temperature of 800 to 900 ° C. by heat exchange with gas while being moved to the other end while rolling inside, and dried. As a result, the moisture in the incinerated ash completely evaporates, and the unburned carbon completely burns, so that the quality as a recycled material can be improved.

At this time, by heating at a treatment temperature of 800 to 900 ° C., measures against dioxins in exhaust gas can be taken. In addition, the waste heat generated at this time is
0 is sent to the primary reaction rotary kiln 406 and reused as a heat source for the primary reaction process.

The incinerated ash dried in the rotary kiln 201 is discharged into the water-cooled conveyor 202 from the other end. The high-temperature incinerated ash discharged into the water-cooled conveyer 202 is rapidly cooled while being conveyed in the conveyer 202, and is cooled and discharged to an outlet temperature of 200 ° C. or lower.

The water-cooled conveyor 202 for rapidly cooling the high-temperature incinerated ash to an outlet temperature of 200 ° C. or less has a cooling water facility 80
The cooling water is supplied by the circulation pump 803.
The high temperature incinerated ash can be rapidly cooled by the supplied cooling water.

The incinerated ash discharged after being rapidly cooled to an outlet temperature of 200 ° C. or less by the water-cooled transfer conveyor 202 is
The material is conveyed to the crushing equipment 30 in the next step by the conveyer 203.

The crushing equipment 30 roughly crushes the dried incinerated ash sent from the drying equipment 20, sorts iron, sorts non-ferrous metals,
This is a facility that performs a pulverization process such as fine pulverization.
The incinerated ash conveyed by the above is roughly crushed to a particle size of, for example, 10 to 20 mm or less by the crusher 301, and metal and dry incinerated ash are separated. The metal and the dry incineration ash roughly crushed by the crusher 301 are sent to the magnetic separator 302.

From the metal and the dry incineration ash sent from the crusher 301, small pieces of iron that could not be sorted and removed by the receiving and supplying equipment 10 are sorted and removed by the magnetic separator 302. Then, the non-ferrous metal from which iron has been removed by the magnetic separator 302 and the dry incineration ash are sent to the non-ferrous metal separator 303.

From the non-ferrous metal and the dry incineration ash sent from the magnetic separator 302, the non-ferrous metal is separated from the non-ferrous metal sorter 303.
Is sorted out. The dried incinerated ash from which the non-ferrous metal has been removed by the non-ferrous metal sorter 303 is sent to the dried incinerated ash tank 305 by the conveyor 304 and stored therein.
The dry incineration ash stored in the dry incineration ash tank 305 is supplied to the pulverizer 307 by the pulverizer supply unit 306 in a fixed amount.

The dry incineration ash supplied to the pulverizer 307 is
The pulverizer 307 pulverizes to a particle size of, for example, 100 to 150 microns or less. Dry incinerated ash, for example, particle size 1
By pulverizing to a size of less than 100-150 microns,
The surface area of the ash can be increased, and the reaction rate of the primary reaction treatment in the subsequent step can be improved.

The dry incineration ash finely pulverized in the pulverizer 307 is discharged to the pulverizer cyclone 309 by air from the pulverizer main fan 308. In the cyclone 309 for the pulverizer, the fine powdered incinerated ash that has flowed in together with the air is separated into fine powdered incinerated ash using centrifugal force generated by swirling of the airflow, dropped downward, and discharged from the lower end.

Dust floating in the cyclone 309 for the pulverizer is collected by the dust collector 310 for the pulverizer, and the fine incinerated ash contained in the dust is dropped downward and discharged from the lower end.

The exhaust gas from which the finely divided incinerated ash contained in the dust has been removed in this manner is supplied to the exhaust gas treatment facility 70.
Is sent to the activated carbon adsorption tower 705, detoxified, and released from the chimney 707 into the atmosphere.

The dry ash in the form of fine powder discharged from the discharge port at the lower end of the cyclone 309 for the pulverizer and the dust collector 310 for the pulverizer is transferred by the transfer conveyor 312 to the transfer conveyor 3.
13 is carried out. Then, the fine powdered incinerated ash is transported by the transport conveyor 313 to the primary reaction facility 40 in the next step.

The primary reaction facility 40 is a facility for performing a primary reaction step of heat dechlorination and pyrolysis of dioxins in the finely powdered dry incinerated ash sent from the crushing facility 30, and is transported by the transport conveyor 313. The resulting fine incinerated dry incineration ash is stored in the pulverized raw material tank 401. The fine powdered incinerated ash stored in the pulverized raw material tank 401 is discharged from the lower end side, and is conveyed to the primary reaction rotary kiln 406 by the conveyor 403.

The dry kiln ash in the form of fine powder is sent from the pulverized raw material tank 401 to the rotary kiln 406 for the primary reaction by the transport conveyor 403, and calcium is mainly contained by the transport conveyor 403 from the additive A supply device 402. Additive A is sent in.

The amount of the additive A supplied to the rotary kiln 406 for the primary reaction is 3 parts by weight based on the dry incinerated ash in the form of powder.
%. Additive A contains a calcium compound as a main component and a function-improving catalyst added thereto, and is used for accelerating the reaction rate in the primary reaction rotary kiln 406. The additive A comprises, for example, 80% of calcium oxide CaO, 5 to 10% of aluminum hydroxide Al (OH) _{3, and} 10% of viscosity.

In the primary reaction rotary kiln 406,
The dry incinerated ash and the additive A in the form of fine powder are rolled to react while being moved in the axial direction, so that a low oxygen atmosphere with an oxygen concentration of about 6% in the kiln furnace and a temperature in the kiln furnace of 80% are used.
By the high temperature treatment of 0 to 900 ° C., the dechlorination and the thermal decomposition reaction of dioxins in the exhaust gas proceed. The reaction equation at this time is as follows.

[0090]

Embedded image

The incinerated ash that has undergone the primary reaction treatment in the primary reaction rotary kiln 406 is discharged from the other end into the water-cooled conveyor 407. Water-cooled conveyor 4
07 is discharged to the conveyor 40
7 is rapidly cooled while being conveyed in
Cooled to below ℃ and discharged.

A water-cooled conveyor 407 for rapidly cooling high-temperature incinerated ash to an outlet temperature of 200 ° C. or less has a cooling water facility 80
The cooling water is supplied by the circulation pump 803.
The high temperature incinerated ash can be rapidly cooled by the supplied cooling water.

In this primary reaction treatment, the exhaust gas generated in the primary reaction rotary kiln 406 is collected by the cyclone 701, and the fine incinerated ash that has flowed in with the air is finely divided by centrifugal force generated by the turning of the air flow. The incinerated ash is separated, dropped downward, and discharged from the lower end. The discharged incinerated ash is transferred to the primary kiln rotary kiln 406 by the conveyor 404 and the conveyor 403.
And is reprocessed.

The exhaust gas discharged from the cyclone 701 is quenched to 200 ° C. or less by the heat exchanger 702 to prevent the generation of dioxins. Then, the exhaust gas discharged is quenched in heat exchanger 702, HCl by slaked lime sprayed from vanishing stone cupellation write device 703, NO _X is adsorbed and removed, is fed to a dust collector 704.

The dust collector 704 collects the dust in the exhaust gas sent in, drops the incinerated ash contained in the dust downward, and discharges it from the lower end. The discharged incinerated ash is returned to the primary reaction rotary kiln 406 by the transport conveyor 405 and the transport conveyor 403 to be reprocessed.

[0096] exhaust gas discharged from the dust collector 704 is fed to the activated carbon adsorption tower 705, dioxins and NO _X are harmless is adsorbed and removed from the exhaust gas by the activated carbon filled in the activated carbon adsorption tower 705. The harmless exhaust gas is exhausted by a fan 706 to a chimney 707.
Is released into the atmosphere.

The incinerated ash discharged after being rapidly cooled to an outlet temperature of 200 ° C. or less by the water-cooled conveyor 407 is
The secondary reaction equipment 50 of the next process is transported by the conveyor 408.
Transported to

The secondary reaction facility 50 is a facility for performing secondary reaction steps such as crushing of incinerated ash sent from the two primary reaction facilities 40 and stable solidification of heavy metals, and is transported by the transport conveyor 408. The incinerated ash is, for example, a particle size of 100 to 1 by a vibrating sieve 501 equipped with a screen.
Those having a size of 50 microns or more are sorted to the crusher 502. The incinerated ash having a particle size of 100 to 150 microns or less passes through the screen of the vibrating sieve 501 and is stored in the primary incinerated ash tank 503.

The incinerated ash that has agglomerated by the primary reaction treatment of the primary reaction equipment 40 and has a particle size of 100 to 150 μm or more is
The crusher 502 crushes the particles to a particle size of, for example, 100 to 150 μm or less to increase the surface area.
2 is stored in a primary incineration ash tank 503 installed below.

The incinerated ash is metered into the secondary reactor 506 from the primary incinerated ash tank 503 by the measuring hopper 505 and is sent from the additive B supply unit 504 as a heavy metal stabilizing agent containing sulfide as a main component. The additive B is measured by the measuring hopper 505 and sent.

Additive B supplied to secondary reactor 506
Is 1% by weight of the dry incinerated ash in the form of fine powder, and the additive B is mainly composed of sulfide and is used to promote a stable solidification reaction of heavy metals in the secondary reactor 506. Additive B is, for example, sodium sulfide Na ₂ S (40%), silicon dioxide
SiO ₂ (10%), sodium carbonate Na ₂ CO ₃ (10%), calcium carbonate CaCO ₃ (10%), anhydrous borane B ₂ O ₃ (10%), calcium silicate CaSiO ₃ (10%), activated oxidation Iron Fe ₂ O ₃ (5 ~
10%) and calcium sulfate CaSO ₄ (10%).

Of these, sodium sulfide, which is the main component of the additive B, plays a role of generating a sulfide compound of heavy metals. Silicon dioxide, sodium carbonate, calcium carbonate, anhydrous borane and calcium silicate mineralize over time. Activated iron oxide functions as a catalyst, and calcium sulfate functions as a swelling inhibitor.

The basic reaction described above is as follows. CDY (cadmium) + [S ^2-] → CdS (cadmium sulfide) Pby (lead) + [S ^2-] → PbS (lead sulfide) ASY (arsenic) + [S ^2-] → As ₂ S ₃ (trisulfide diarsenic) HGy (Hg) + [S ^2-] → Hg ₂ S (mercuric sulfide) CRY (chromium) + [S ^2-] → CrS ₃ (trisulfide chromium) Se (selenium) + [S ^2- ] → SeS (Selenium sulfide)

In the secondary reactor 506, the incinerated ash and the additive B are treated at a treatment temperature of 180 to 200 ° C. and an oxygen concentration of 6 in the furnace.
%, The solidification reaction of the heavy metal proceeds.

That is, when treated with predetermined components, an alite phase (3CaO.SiO ₂ -based solid solution) and a belite phase (2CaO.
When water is added to a vitreous mixed phase such as an SiO ₂ -based solid solution) or an aluminate phase (3CaO / Al ₂ O ₃ -based solid solution), heat of hydration is generated, and firstly, solidification occurs and fluidity is lost, and then silica A calcium hydrate gel forms and hardens.

The incinerated ash treated in the secondary reactor 506 is discharged as a cement auxiliary material. Since the treated incinerated ash has been baked through these steps, it can be hydrated and solidified when mixed and stirred with an appropriate amount of water. The secondary reaction incineration ash undergoes a hydration reaction to be stabilized and solidified, and has an effect of preventing elution of heavy metals.

The incinerated ash treated in the secondary reactor 506 is sent to the bagging equipment 60 in the next step by the air transporter 507.

The incinerated ash sent to the bagging equipment 60 in the next step is accommodated in the product tank 601 and bagged by the bagging machine 602 installed therebelow. The incinerated ash that has been bagged by the bagging machine 602 and commercialized as a cement auxiliary material is carried out by the product carrying-out conveyor 603, loaded on a carrier by a crane or the like, and transported.

[0109]

As is apparent from the above description, according to the incineration ash processing apparatus of the present invention, the incineration ash ("main ash") is used.
And incinerator ash (including "main ash" and "fly ash"), which can be treated at temperatures between 800 ° C and 900 ° C without the need to treat at temperatures as high as 1000 ° C or higher. ) Can be treated, and this can be effectively used as a cement auxiliary material, a raw material and the like. This has been explained mainly for general incinerated ash, but "fly ash" in incinerated ash designated as specially managed waste can also be treated in the same way, and there is no pollution problem .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an entire apparatus showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Receiving supply equipment 101 Storage device 102 Quantitative supply device 103 Transport conveyor 104 Supply disperser 105 Vibrating sieve 106 Transport conveyor 107 Magnetic separator 108 Transport conveyor 109 Transport conveyor 20 Drying equipment 201 Rotary kiln 202 Water-cooled transport conveyor 203 Transport conveyor 204 Fuel tank 205 Service tank 30 Crusher 301 Crusher 302 Magnetic separator 303 Nonferrous metal sorter 304 Conveyor 305 Dry incineration ash tank 306 Crusher feeder 307 Crusher 308 Crusher main fan 309 Crusher cyclone 310 Crusher dust collector 311 Vent fan for crusher 312 Conveyor 313 Conveyor 40 Primary reaction equipment 401 Grinding material tank 402 Additive A supply device 403 Conveyor 404 Conveyor Bear 405 Transport conveyor 406 Rotary kiln for primary reaction 407 Water-cooled transport conveyor 408 Transport conveyor 50 Secondary reaction equipment 501 Vibrating sieve machine 502 Crusher 503 Primary incineration ash tank 504 Additive B feeder 505 Weighing hopper 506 Secondary reactor 507 Pneumatic transporter 60 Bagging equipment 601 Product tank 602 Bagging machine 603 Product carry-out conveyor 70 Exhaust gas treatment equipment 701 Cyclone 702 Heat exchanger 703 Slaked lime blower 704 Dust collector 705 Activated carbon adsorption tower 706 Exhaust fan 707 Chimney 708 Compressor 80 Cooler 801 Cooling tower 802 Water tank 803 Circulation pump

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 53/68 B01D 53/34 134E 53/64 134A B09B 5/00 136Z F23G 7/00 ZAB B09B 3/00 304G 103 5/00 NF term (reference) 3K061 AA07 AB01 AC01 AC02 BA05 BA08 BA09 BA10 DA02 DA03 DA05 DA18 DA19 DB01 DB03 EB01 EB06 EB18 4D002 AA12 AA21 AA28 AC04 BA03 BA04 BA12 BA13 CA05 CA13 CA20 DA02 DA05 DA08 DA12 DA11 DA12 DA12 DA22 DA46 DA47 EA02 GA01 GA02 GA03 GB02 GB03 GB06 GB08 4D004 AA36 AA37 AB03 AB07 AC05 BA02 CA04 CA08 CA09 CA15 CA22 CA32 CA42 CB09 CB42 CC11 DA03 DA06 DA20

Claims (3)

[Claims] 1. Receiving and supplying equipment for performing pretreatment processes such as storage, quantitative supply, particle size sorting, and magnetic force sorting of the incinerated ash that has been transported, water removal of the incinerated ash sent from the receiving and supplying equipment, and unburned Drying equipment that performs a drying process by high-temperature treatment of 800 to 900 ° C, such as separate incineration, and performs a drying process of rapidly cooling to an outlet temperature of 200 ° C or less while being conveyed by a water-cooled conveyor, and dry incineration sent from the drying equipment Crushing equipment that performs crushing processes such as coarse crushing of ash, iron sorting, non-ferrous metal sorting, and fine crushing to a particle size of 100 to 150 microns or less, and calcium as a main component in finely powdered dry incineration ash sent from the crushing equipment. Low-oxygen atmosphere and 800-900
Primary reaction equipment that performs the primary reaction step of heat dechlorination and thermal decomposition of dioxins by high temperature treatment at ℃ and rapidly cools to an outlet temperature of 200 ° C or less during transportation by a water-cooled transportation conveyor, and is sent from the primary reaction equipment. Particle size of incinerated ash 10
Crushing to 0-150 microns or less, particle size 100-150
An additive which is a heavy metal stabilizing and solidifying agent containing sulfide as a main component is added to incineration ash having a size of less than micron, and a treatment temperature of 180 to 20 is added.
A secondary reaction facility that stirs and mixes at 0 ° C and an oxygen concentration of about 6% in the furnace to perform secondary reaction processes such as stable solidification of heavy metals, etc. Bagging equipment that performs the above processes, exhaust gas treatment equipment that performs exhaust gas treatment processes such as dust collection, quenching, adsorption, denitration, and adsorption of dioxins, and water-cooled conveyors for drying equipment and water-cooled conveyance for primary reaction equipment An incineration ash processing apparatus, comprising: a cooling water facility for supplying cooling water to a conveyor to cool them. 2. The additives added in the primary reaction step are calcium oxide 80%, aluminum hydroxide 5-10%, viscosity
2. The incineration ash treatment apparatus according to claim 1, wherein the apparatus comprises 10% and an amount of 3% by weight of the ash is added. 3. The additives added in the secondary reaction step are sodium sulfide 40%, silicon dioxide 10%, sodium carbonate 10%.
%, Calcium carbonate 10%, anhydrous borane 10%, calcium silicate 10%, activated iron oxide 5-10%, calcium sulfate 10
%, Wherein an amount of 1% of the ash weight ratio is added.
The incineration ash processing device described in the above.