JPH10109011A - Purifying method of waste gas at incinerator and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely remove and adsorb a harmful component in a waste gas generated by incinerating various wastes to discharge the waste gas to the atmosphere in a clean state and to convert the adsorbed harmful component to a harmless slug and to reuse the harmless slug as a civil/building material, etc. SOLUTION: In a spray tower 40 to which the waste gas is introduced, the waste gas is washed with a shower liq. to which an adsorbent is incorporated, and the harmful component is adsorbed onto the adsorbent by passing the shower liq. through in order each falling hole 52, (55), 57 and (59) of plural weir plates 51, 53, 56 and 58, and the harmful component is separated and removed by filtering. A shower pipe 47 spraying the shower liq. and the plural weir plates 51, 53, 56 and 58 in which many falling holes 52, (55), 57 and (59) which become gradually small size in accordance to reach a lower direction are bored and which are arranged in steps are provided respectively in the spray tower 40, and a blower 65 discharging a pure waste gas in the spray tower 40 to outside and a filter device 66 filtering the shower waste liq. discharged from a discharge port 45 and separating and removing the harmful component are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adsorbs and separates, for example, harmful gases generated during incineration of various industrial wastes, harmful dust contained in soot and other harmful components, and renders them harmless by re-melting and incineration. The present invention relates to a method for purifying exhaust gas in an incinerator and a purifying apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, in the incineration treatment of various industrial wastes such as plastics, rubber, waste oil, garbage and garbage, as a method for purifying exhaust gas generated during incineration, adsorption, absorption, Diffusion, utilization of centrifugal force, drying, control by a gas analyzer, chemical purification, and the like. For example, in one method in the case of the adsorption method, by injecting slaked lime powder into an exhaust gas flue for deriving waste smoke after incineration, harmful components and the like contained in the exhaust gas are adsorbed to the slaked lime powder and then filtered. Although they are collected by filtration, dioxins and the like are exhausted as they are contained.

[0003]

However, in the above-described adsorption method using slaked lime powder, it is necessary to finally dispose of the sediment in the filter that has adsorbed and collected harmful components. For example, when these are landfilled, Imperfect disposal, such as infiltration into groundwater after landfill, may cause secondary pollution. In addition, in addition to turning the sediment into a slag in a high-temperature molten incinerator, there is no method for reusing the incinerated ash at the present time, so a similar problem would occur if the final disposal would be the same. However, the landfills required by landfills are gradually becoming smaller, and their installation is simply not acceptable.

On the other hand, in the case of treatment by combustion treatment, since the objects to be burned are various kinds of waste, highly toxic chemical substances such as dioxins are inevitably generated in the composition formed in the combustion process. . This is then diffused into the atmosphere and then dropped, eventually accumulating in the human body through fish, cultivation, and the like, thereby contributing to carcinogenesis and causing teratogenic problems.

[0005] Thus, from the necessity of preserving the global environment,
In addition, since the emission of carbon dioxide, which is a cause of global warming, is suppressed, no harmful gases are diffused into the atmosphere, and the environment is not destroyed by eliminating the disposal of incinerated ash. At present, a processing method is desired.

Accordingly, the present invention has been made in view of the above-mentioned various circumstances as described above. The present invention reliably absorbs and removes harmful components in exhaust gas generated by the melting and incineration of various kinds of waste, and cleanly removes air from the atmosphere. The harmful components that can be diffused and adsorbed inside are re-incinerated in a high-temperature melting incinerator to form harmless slag, which can be reused as bricks and other civil engineering and building materials. It is an object of the present invention to provide a method and a device for purifying exhaust gas in an incinerator, which can also protect the surrounding environment as a blockage treatment cut off from the environment.

[0007]

In order to achieve the above-mentioned object, a method for purifying exhaust gas in an incinerator according to the present invention comprises removing and separating harmful components in exhaust gas generated when various types of waste are incinerated. In the spray tower 40 into which the exhaust gas has been introduced, the exhaust gas is smoke-washed by a shower liquid mixed with an adsorbent, and a suitable number of dams 51, 53, 56 arranged in a stepped manner in the spray tower 40. , 58 each drop hole 5
The harmful components are adsorbed on the adsorbent by sequentially passing through steps 2, (55), 57, and (59), and are separated and removed by filtration. Further, in the exhaust gas purifying apparatus in the incinerator according to the present invention used in the above-mentioned purifying method, the inlet 44 for introducing the exhaust gas generated when various kinds of waste are incinerated is introduced.
Is formed at the upper part, and a spray tower 40 having a discharge port 45 at the lower part for discharging the shower liquid in which the exhaust gas is melted is formed. Shower tube 4 placed in
7 and a plurality of weirs 5 having a large number of falling holes 52, (55), 57, (59),
1, 53, 56, 58, a blower 65 that sucks purified exhaust gas and discharges it to the outside, and a filtering device 66 that filters shower effluent drained from the outlet 45 and separates and removes harmful components. It is equipped. Dams 51, 53,
Drop holes 52, (55), 57,
(59) is a first drop hole 52 in the first dam board 51 arranged above, a drop hole (55) in the second dam board 53 arranged below the first dam board 51, and further below the second dam board 53. Each of the third drop holes 57 in the third dam 56 arranged is formed to have a smaller diameter as it reaches the lower position. Second
The weir board 53 is a bottomed cylindrical shape having an outflow hole 54A formed in the bottom wall, and a falling cylinder 55 formed by drilling a large number of pores 54B in the surrounding cylindrical wall so as to hang down on the lower surface. The outflow guide tube 5 is connected to the outer periphery of the fall tube 55 so as to form a double cylindrical shape by being appropriately spaced from the outer peripheral surface of the fall tube 55.
5A can be provided and the fourth dam 58
Can have the same configuration as the second dam 53. The shower liquid separated by the filter 66 is supplied to a shower pipe 47, and the harmful components are incinerated again.

In the method and apparatus for purifying exhaust gas in the incinerator according to the present invention having the above-described configuration, the exhaust gas generated as various wastes are incinerated by the appropriate incinerator 1 is introduced. Spray tower 40 through port 44
Once introduced, it is smoked and melted by the shower liquid. In addition, the harmful components in the exhaust gas pass through the drop holes 52, (55), 57, and (59) in the dams 51, 53, 56, and 58 arranged stepwise in the spray tower 40, so that the harmful components in the exhaust gas are reduced by the shower liquid. After being melted by itself and adsorbed by the adsorbent mixed in the shower liquid, the liquid is agglomerated with the adsorbent as a nucleus, and after being discharged through the outlet 45, the filtering device 66 separates and removes them.
In the spray tower 40, the dams 51, 53, 56, and 58, which are arranged in a stepwise manner at the top and bottom, respectively, suppress the falling down of the shower liquid, and fall holes 52,
Through the steps (55), 57 and (59), the contact between the shower liquid and the harmful components in the exhaust gas is increased, and the melting thereof is promoted. When the shower liquid flows down along the peripheral wall, the falling tube 55 having a bottomed cylindrical shape in the second dam 53 increases the contact with the exhaust gas on the inner and outer surfaces, so that the outlet hole 54A formed in the bottom wall portion is formed. By adjusting the amount of drainage according to the size, the contact with the exhaust gas is made good, and the absorption and melting thereof are further promoted. In addition, the outflow guide cylinder 55A arranged so as to form a double cylinder around the drop cylinder 55 makes the contact with the exhaust gas even better by hitting the shower liquid discharged from the pores 54A of the drop cylinder 55, Adsorption of harmful components in exhaust gas is increased. The blower 65 discharges the clean exhaust gas cleaned in the spray tower 40 to the atmosphere and makes the inside of the spray tower 40 a negative pressure to smoothly introduce the exhaust gas generated after the incineration. The liquid is ejected again from the shower pipe 47 into the spray tower 40, and the slag-like harmful components are again incinerated and are not discharged to the outside.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes an incinerator, and the incinerator 1 is erected on an installation surface. A plurality of columns 2, a refractory incinerator 3 having a refractory structure supported by the columns 2, a slag cooler 20 disposed below the molten incinerator 3, and a flue gas passage 30 connected above the molten incinerator 3. And, for example, plastic,
Various industrial wastes such as rubber, waste oil, garbage and garbage are put in and incinerated.

The incinerator 3 is constructed of a refractory brick or the like, and is substantially enclosed by a peripheral wall having an opening 4 which is opened and closed. The bottom gradually narrows as it goes down. The heating section 6 is provided so as to be continuous with the tapered section 5 having such a small diameter. The heating unit 6 in the illustrated example is an electric resistance heating element 8 whose outer periphery is surrounded by a protective wall 7 constructed of a firebrick or the like.
A carbon crucible 9 made of graphite is arranged on the inner periphery of the slag, and a slag discharge hole 11 connected to the slag cooler 20 disposed below is formed in a substantially central position. The electric resistance heating element 8 includes, for example, a furnace material in which a pair of electrodes are arranged to face each other, a large number of heating elements filled between the electrodes, and a power supply circuit for supplying a current between the electrodes. It is composed of particles, inorganic particles, and a carbonized binder that bonds these particles, and the inorganic particles are electrically insulating below a predetermined temperature, but have the property of becoming a conductor or semiconductor above a predetermined temperature. This allows the internal temperature to be increased due to the high heat retention performance, and furthermore, the voltage,
The current control is easy, and it can be heated to, for example, about 1800 ° C. The slag discharge hole 11 is used to drop slag and the like of various kinds of waste melted by being incinerated inside the incinerator 3 by natural fall.
It is discharged into the outside, dropped into the slag cooler 20, and cooled so that the slag cooler 20 can be used as various kinds of recycled products such as civil engineering and construction materials.

In addition, an appropriate number of air holes 12 for supplying air to the inside of the incinerator 3 are formed at predetermined positions in the peripheral wall of the incinerator 3, and are generated after being incinerated in the incinerator 3. In the upper part of the incinerator 3, which is an exhaust port for communicating exhaust gas such as dust and smoke to the flue gas passage 30, dust and the like are temporarily retained in the melt incinerator 3 to suppress discharge and melt and incinerate. An appropriate number of exhaust holes 1 to maintain the heat retention inside the furnace 3
4 is provided with the suppression board 13 which is opened.

An exhaust taper portion 15 having a small diameter is formed in the communicating exhaust port at the upper portion of the melt incinerator 3 so as to gradually narrow as it goes upward, and above the exhaust taper portion 15. A secondary heating unit 16 is provided for heating the exhaust gas to be exhausted and further burning it. The secondary heating section 16 is formed by forming an electric resistance heating element 18 whose outer periphery is surrounded by a protective wall 17 made of a refractory brick or the like in the same manner as in the heating section 6 around the communication exhaust port. The electric resistance heating element 18 is made of the same material as that of the heating section 6, for example, 1000 to 1500 ° C.
The voltage and current are controlled so as to be heated to a certain degree.

The slag cooler 20 has a water tank structure in which cooling water is stored, and may be provided with a conveyor device for automatically discharging slag solidified by cooling to the outside.

The flue gas passage 30 guides and discharges flue gas such as dust and flue gas to a spray tower 40 for absorbing and melting harmful substances, harmful gases and other harmful components contained in the flue gas in a solvent described below. In the drawing, the inlet is connected to the communication exhaust port at the upper part of the incinerator 3 and the outlet is connected to the upper part of the spray tower 40 arranged at the side of the incinerator 1. It is formed in an inverted U-shaped cylindrical shape as viewed from above.

The spray tower 40 is supported by a plurality of columns 41 erected on the installation surface, and has an inlet 44 for introducing exhaust gas generated when various kinds of waste are incinerated, and a shower for melting the exhaust gas. Outlet 45 for draining liquid
At the bottom. A shower pipe 47 disposed immediately below the inlet 44 so as to eject the shower liquid mixed with the adsorbent, and a large number of drop holes 52, (55), 57,
A plurality of dampers 51, 53, 56, 58, each of which is provided with a stepped hole therein, a blower 65 for sucking purified exhaust gas and discharging it to the outside, and an outlet. A filter 66 for filtering the shower effluent drained from the filter 45 and separating and removing harmful components, and exhaust gas including dust, smoke and the like generated from the incinerator 3 by the suction action of the blower 65. Is introduced inside, and only the clean exhaust gas after melting and removing the harmful components is discharged to the outside.

That is, the spray tower 40 has a large number of drop holes 52, formed between an inlet 44 formed at the upper part and an outlet 45 formed at the lower part, inside the surrounding wall 43 formed as a substantially watertight structure. A plurality of dams 51, 53, 56, 58 in which (55), 57, (59) are opened are provided in a stepped manner. The upper inlet 44 gradually increases in diameter as it goes down the inside of the spray tower 40 body, thereby reducing the pressure of the exhaust gas introduced. A shower pipe 47 for ejecting a shower liquid mixed with an adsorbent is disposed immediately below the inlet 44 so that the introduced dust, smoke and the like are washed by the shower liquid. The shower liquid filtered and separated by the filtration device 66 is supplied to the shower pipe 47 so that the shower liquid can be reused, and if necessary, the adsorbent is replenished and mixed.

In the drawing, weirs 51, 53, 56, 58
Are arranged in order from the upper side as a first, a second, a third, and a fourth one in total of four sheets. As shown in FIG. 4, the first damper 51 has a plurality of slightly large diameter first drop holes 52 formed in the entire area thereof, and the shower liquid ejected from the shower pipe 47 absorbs harmful components and the like. First drop hole 5
Along the periphery of the hole 2, the tube is converged into a cylindrical shape and flows down. As shown in FIG. 5, the second dam 53 has an inner diameter slightly smaller than that of the first drop hole 52 in the entire area thereof, and has a bottomed cylindrical shape in which an outflow hole 54A is formed in the bottom wall.
A drop cylinder 55 formed by forming a large number of pores 54B in the peripheral cylinder wall is connected to the lower surface in a hanging manner, and the amount of the shower liquid flowing down from the first dam 51 is adjusted by the bottom wall. Along with the suppression, the flow is made to flow down along the inner and outer surfaces of the drop cylinder 55 through the small holes 54B. Also, as shown in FIG. 7, on the outer periphery of the drop cylinder 55,
An outflow guide cylinder 55A may be provided so as to form a double cylinder by leaving an appropriate distance from the outer peripheral surface of the drop cylinder 55, and the shower liquid discharged to the periphery from the pores 54B may be provided. By flowing down along the inner peripheral surface, the harmful components are further absorbed and melted.

As shown in FIG. 6, the third damper 56 has a third drop hole 57 having a diameter slightly smaller than the inner diameter of the drop cylinder 55 over the entire area thereof.
Is formed, so that the shower liquid flowing down from the second damper 53 is collected in a tubular shape along the periphery of the third drop hole 57 while absorbing the exhaust gas and the like and flows down. . The fourth dam 58 is similar to the second dam 53, and the fourth drop cylinder 59 in which the shower liquid flowing down from the third dam 56 is perforated in the fourth dam 58, Further, it is converged into a cylindrical shape along the wall surface of the outflow guide cylinder and flows down. Although not shown, the fourth dam 58 may have the same structure as the first dam 51 or the third dam 56, and any of them can be arbitrarily selected.

These dams 51, 53, 56, 58
May be arranged in different combinations of some of them, and may be appropriately arranged according to a plurality of groups of the combinations, such as dust generated in the incinerator 1, smoke emission amount, harmful components, etc. It can be arbitrarily selected according to the type or the like, and the size, length, etc. of the drop holes 52, (55), 57, (59) formed in the dams 51, 53, 56, 58, respectively, are also appropriately determined. Is selected.

The outlet 4 at the lower part of the spray tower 40
5, a funnel-shaped drain guide (not shown) having a gradually decreasing diameter as the upper part goes down provides a shower drain flowing down from the fourth dam 58. Consideration can also be given to focusing around 45. Further, an exhaust duct 62 penetrating the peripheral wall 43 is disposed above the outlet port 45, and the intake port of the exhaust duct 62 is directed downward, so that the intake efficiency is improved. As such, it communicates with a blower 65 located outside the spray tower 40 body. The drain guide may not be provided if care is taken to prevent the shower drain from entering the exhaust duct 62.
In particular, the fourth damper 58 may not be provided when the fourth drop cylinder 59 and the outflow guide cylinder are connected to the lower surface.

The filtering device 66 is disposed below the outlet 45. The filtering device 66 separates the harmful components by filtering the shower effluent absorbing and melting the harmful components drained from the outlet 45, and solidifies the harmful components. It is solidified and then put into the melting incinerator 3 again so that it can be incinerated. The filtered shower liquid is sucked up by a pump 67, supplied to a shower pipe 47 after being pressurized, and circulated so as to be reused without draining to the outside.

Thus, the adsorbent mixed in the shower liquid has a scientific name that is produced around Kobishiike, which is a base of the Ioyama mountain range near the Kanazawa city, which is the prefectural border between Ishikawa and Toyama prefectures. It is planned to use crushed and crushed powder of quartz diorite hakamaiwa (so-called Ioseki / green tough / mineral ore "Pegasus") and its components. Is as shown in Table 1 according to the analysis of the Ministry of International Trade and Industry Light Industry Bureau.

[Table 1] That is, the above-mentioned adsorbent used in the present embodiment in the present invention is roughly divided into three bases, the first being a sea floor stone of a submarine protuberance called green, and the second being a green. Is a volcanic rock glass ore called black, the third is shell fossils hundreds of millions of years old,
The various effects produced by combining these three purely natural bases are immeasurable and contain rare elements that are said to be indispensable for various organisms that cannot be elucidated with the current scientific analysis capabilities. Is what it is.

In addition, 10 g of the adsorbent is added to 100 ml of distilled water.
The change in hydrogen ion concentration due to immersion in the sample was 6.1 immediately after, 7.4 hours after 8 hours, 7.4 and 48 hours after 24 hours.
After hours it was 7.4.

The pollutant adsorption performance of this adsorbent and that of barley stone are as shown in Table 2;
In this method, 50 g of each of the adsorbent and the barley rice was used, and the mercury content was 0.1 g.
The solution was charged into 500 ml of a 01 wt ppm solution, and the change over time in the mercury content was measured.

[Table 2]

The adsorption performance of hexavalent chromium on the adsorbent and the activated carbon is as shown in Table 3, which is a comparative example at different weight percentages of the adsorbent and the activated carbon.
1.67 mg / l test solution was used.

[Table 3]

The performance of the adsorbent for decomposing and adsorbing harmful heavy metals and pesticide organic chlorine is as shown in Table 4, which shows the change over time after the adsorbent was added to 100 ml of water in which various types of drin were melted. Is what I saw.

[Table 4]

The treatment action of the aqueous solution of heavy metal Cd (cadmium) is as shown in Table 5, which shows that
a (CH ₃ COO) ₂ 2H ₂ O and add Cd 1.15p
FIG. 3 shows changes over time after the adsorbent was added to an aqueous solution at pm.

[Table 5] According to this, it was confirmed that the cadmium concentration of 1.15 decreased by about 60% after one day, and decreased to about 1/6 after two days. In addition, chlorine such as ammonia and nitrite, free It was also confirmed that compounds such as chlorine, cyanide and anone had a treatment effect, and it was confirmed that harmful substances such as PCB and dioxin also exert the same adsorption treatment effect.

Next, in the embodiment configured as described above, the case where various wastes are incinerated by this and the harmful exhaust gas generated therefrom is treated will be described. The inlet of the molten incinerator 3 in the incinerator 1 will be described. While various kinds of wastes are put in from 4, the wastes are melted and incinerated by causing the electric resistance heating elements 8 and 18 to generate heat by turning on the power in the heating units 6 and 16. The slag is dropped into the slag cooler 20 disposed below the molten incinerator 3 by the slag discharge holes 11 to be cooled and turned into slag. The slag is taken out from the slag cooler 20 and used for civil engineering and construction materials and the like.

On the other hand, the dust discharged through the exhaust hole 14,
Exhaust gas such as flue gas is combusted again when passing through the inside of the secondary heating unit 16, and is guided to the upper part of the spray tower 40 through the flue gas passage 30. By the suction action of the blower 65 connected to the lower side of the spray tower 40, the spray tower 4
The dust and the like accompanying the negative pressure in the chamber 0 are guided downward and smoke-washed by the shower liquid mixed with the adsorbent, and the first to fourth dams 51,
Exhaust gas and the like are absorbed and melted in the shower liquid by sequentially passing through 53, 56, and 58. In particular, the adsorbent, which is a powdery quartz diorite limestone mixed in the shower liquid, adsorbs PCBs and other harmful substances in the waste smoke, and the shower liquid itself melts dioxin, chlorine, etc. and showers. The liquid is discharged from the outlet 45 and falls into the filtering device 66.

After the harmful components and the like in the exhaust gas are adsorbed and removed by the shower liquid in the spray tower 40, the exhaust gas is cleaned and discharged to the outside air by the blower 65 and the exhaust duct 62. On the other hand, substances and the like to which harmful components that have fallen into the filtration device 66 are separated and removed from the raw water of the shower liquid by the filtration device 66, and are again put into the incinerator 3 through the inlet 4 to be incinerated. Processed
The shower liquid itself is pressurized by the pump 67 and supplied to the shower pipe 47, where it is circulated for reuse.

[0031]

Since the present invention is configured as described above, the soot and harmful components contained in the flue gas generated by the incineration of various wastes are reliably removed and adsorbed, and the air in a clean state is removed. The harmful components that can be diffused and adsorbed inside are re-incinerated to form harmless slag, which can be reused as bricks and other civil engineering and construction materials, etc., to preserve the global environment and to effectively use resources. You can do it. In addition, incineration, discharge of exhaust gas after incineration, adsorption and removal of harmful components from this exhaust gas, separation after adsorption, and other processes can all be made into a blockage treatment system in a state where it is shut off from the outside, It does not pollute the environment, does not require landfills or other final disposal sites, and can be disposed of safely without secondary pollution.

That is, in the present invention, in the spray tower 40 into which the exhaust gas has been introduced, the exhaust gas is smoke-washed by the shower liquid mixed with the adsorbent, and an appropriate number of dams 51 disposed in the spray tower 40 in a stepped manner. , 53, 56, and 58, the harmful components are adsorbed to the adsorbent by passing through the respective drop holes 52, (55), 57, and (59), and the harmful components are separated and removed by filtration. 40 is a shower pipe 47 disposed immediately below the inlet 44 so as to eject the shower liquid mixed with the adsorbent, and a large number of drop holes 52, (5).
5), 57, and (59) are perforated, and a plurality of dampers 51, 53, 56, and 58 disposed in a stepped manner therein, a blower 65 communicated for exhaust, and a discharge port 45. And a filtration device 66 for filtering and removing harmful components from the shower effluent drained from the wastewater, thereby eliminating harmful components in the exhaust gas generated by incineration of waste, such as PCB. , Dioxins and other substances can be adsorbed and removed and released to the atmosphere in a clean state.
The slag generated by cooling can be used for secondary use as, for example, civil engineering and construction materials.

The drop holes 5 in the dams 51, 53, 56, 58 arranged stepwise inside the spray tower 40.
Reference numerals 2, (55), 57, and (59) denote first drop holes 52 in the first dam 51 disposed above, drop holes (55) in the second dam 53 disposed below the first dam 51, Further, the third drop hole 5 in the third dam 56 arranged below the second dam 53
Each of the dams 7, 53, 56, and 58 is formed to have a smaller diameter as it reaches the lower position. , (55), 57, and (59), the contact between the shower liquid and the harmful components in the exhaust gas can be increased, and the adsorption and melting by the adsorbent can be promoted.

Further, the second dam 53 is provided with an outflow hole 5 in the bottom wall.
Since a falling cylinder 55 formed by drilling a large number of pores 54B in a peripheral cylinder wall and having a bottom surface with an opening 4A is connected to the lower surface in a hanging manner, a shower along the peripheral wall is provided. When the liquid is allowed to flow down, it is inserted into the inside and outside through the fine holes 54B, thereby increasing the contact with the exhaust gas on the inner and outer surfaces. Furthermore, the contact with the exhaust gas is improved by adjusting the amount of drainage passing through the drop cylinder 55 according to the size of the outflow hole 54A opened in the bottom wall, and the absorption and melting thereof can be further promoted. it can. In addition, since the outflow guide cylinder 55A is disposed so as to form a double cylinder around the fall cylinder 55, the shower liquid discharged from the pores 54A of the fall cylinder 55 hits the inner surface of the outflow guide cylinder 55A. This makes it possible to further improve the contact with the exhaust gas and increase the action of adsorbing harmful components in the exhaust gas.

Further, the fourth dam 58 has the same construction as the second dam 53, so that the final adsorbent absorbs harmful components while blocking the flow of the shower liquid in the spray tower 40. And discharge of the shower effluent to the outside by the blower 65 can be prevented.

Blower 65 communicating with spray tower 40
Discharges clean exhaust gas cleaned in the spray tower 40 to the atmosphere, and makes the spray tower 40 a negative pressure state, thereby facilitating the introduction of exhaust gas generated after incineration into the spray tower 40. is there. On the other hand, the shower liquid separated from the substance to which the harmful component is adsorbed by the filtration device 66 is supplied to the shower pipe 47 again, so that the shower solution can be squirted into the spray tower 40 and circulated so that it can be reused. Since it is not incinerated and released to the outside as it is, it contributes to environmental protection and can be treated safely.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram according to an embodiment of the present invention.

FIG. 2 is a sectional view of the spray tower.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a sectional view taken along line BB in FIG. 2;

FIG. 5 is a sectional view taken along the line CC in FIG. 4;

FIG. 6 is a sectional view taken along line DD of FIG. 2;

FIG. 7 shows C in FIG. 4 in another embodiment.
FIG. 4 is a sectional view taken along line C of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Incinerator 2 ... Column 3 ... Melting incinerator 4 ... Inlet 5 ... Taper part 6 ... Heating part 7 ... Protective wall 8 ... Electric resistance heating element 9 ... Carbon crucible 11 ... Slag discharge hole 12 ... Air hole 13 ... Suppression Panel 14 ... Exhaust hole 15 ... Exhaust taper section 16 ... Secondary heating section 17 ... Protective wall 18 ... Electrical resistance heating element 20 ... Slag cooler 30 ... Smoke exhaust path 40 ... Spray tower 41 ... Strut 43 ... Surrounding wall 44 ... Introduction Mouth 45 ... Outlet 47 ... Shower pipe 51 ... First dam 52 ... First drop hole 53 ... Second dam 54A ... Outflow hole 54B ... Fine hole 55 ... Drop cylinder 55A ... Outflow guide cylinder 56 ... Third dam 57 third drop hole 58 fourth dam 59 fourth drop cylinder 62 exhaust duct 65 blower 66 filtration device 67 pump

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 53/77 F23J 15/04

Claims (7)

[Claims] 1. A method for removing and separating harmful components in exhaust gas generated when various kinds of waste are incinerated, wherein the exhaust gas is smoke-washed by a shower liquid mixed with an adsorbent in a spray tower into which the exhaust gas is introduced. The harmful components are adsorbed on the adsorbent by sequentially passing through the drop holes of an appropriate number of dams arranged stepwise in the spray tower, and are separated and removed by filtration. Purification method. 2. A spray tower having an inlet for introducing exhaust gas generated when various kinds of wastes are incinerated and an outlet for discharging a shower effluent in which the exhaust gas is melted is formed at a lower part, and the spray tower is formed by the spray tower. Is a shower pipe arranged just below the inlet so as to eject the shower liquid mixed with the adsorbent, and a plurality of weirs that are provided with a large number of falling holes and are arranged stepwise inside. An incinerator characterized by comprising a blower that sucks purified exhaust gas and discharges it to the outside, and a filtration device that filters shower effluent drained from an outlet and separates and removes harmful components. Exhaust gas purifier. 3. A drop hole in each of the dams is a first drop hole in a first dam disposed above, a drop hole in a second dam disposed below the first dam, and further below a second dam. 3. The exhaust gas purifying apparatus for an incinerator according to claim 2, wherein each of the third drop holes in the third weir arranged has a smaller diameter as it goes down. 4. The second damper is a bottomed cylinder having an outflow hole formed in a bottom wall portion, and a falling cylinder formed by forming a large number of pores in a surrounding cylinder wall is formed on a lower surface. 3. A hanging connection.
Or an apparatus for purifying exhaust gas in an incinerator according to item 3. 5. The incinerator according to claim 4, wherein an outflow guide tube is provided on the outer periphery of the fall tube so as to form a double tube at an appropriate distance from the outer peripheral surface of the fall tube. Exhaust gas purifier. 6. The exhaust gas purifying apparatus in an incinerator according to claim 2, wherein the fourth damper has the same configuration as the second damper. 7. The exhaust gas purifying apparatus for an incinerator according to claim 2, wherein the shower liquid separated from the filter is supplied to a shower pipe, and harmful components are incinerated again.