JP3202453B2 - Exhaust gas treatment method for melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas treatment method for a melting furnace applied to a melting furnace for melting and processing incinerated ash generated by incinerating municipal solid waste, sewage sludge or other waste in an incinerator. About.

[0002]

2. Description of the Related Art In general, incineration ash generated by incineration of municipal solid waste, sewage sludge, or other waste in an incinerator is, in most cases, landfilled. However, it is becoming increasingly difficult to secure landfill sites year by year, and there is a demand for a method of reducing the volume of incinerated ash to be reclaimed, that is, a volume reduction treatment. If the incinerated ash is buried in a landfill without treatment, the incinerated ash itself contains various harmful substances such as heavy metals. The unburned organic matter in the incineration ash is dissolved in the incineration ash, and these phenomena cause secondary pollution. Therefore, there is a demand for a treatment for making the incineration ash discharged from the incinerator pollution-free.

Under such circumstances, various types of incineration ash melting apparatuses have been developed. As one of them, for example, a melting furnace using a plasma torch has been developed (for example, Japanese Patent Publication No. 4-6351).
No. 6). The structure of such a plasma melting apparatus will be described with reference to FIG.

The plasma melting furnace 1 melts incineration ash, particularly municipal waste incineration ash containing a large amount of high melting point materials such as earth and sand, pottery, and metal, in a plasma arc furnace 4. 4, a plasma system for generating plasma in a plasma torch 5 provided in a plasma arc furnace 4.

[0005] As shown in FIG. 5, a plasma-cooled furnace 4 is provided with a water-cooled furnace lid 30 which is an upper part of a furnace body 29. The furnace body 29 is constructed of a refractory material such as carbon, magnesia, and alumina. The tilting of the furnace body 29 allows the residual molten slag accumulated in the furnace body 29 to be released. Further, the furnace cover 30 is provided with a torch elevating device 31, an incineration ash charging chute 7, and an exhaust gas outlet cover 32 through which exhaust gas is guided to an exhaust gas duct. The plasma torch 5 is moved by the torch elevating device 31 to the furnace cover 30.
It is provided so that it can be installed in. A graphite electrode serving as a counter electrode 33 of the plasma torch 5 is buried in the furnace bottom of the furnace body 29, and includes an electrode (+ electrode) built in the plasma torch 5 and a graphite electrode provided on the furnace bottom of the furnace body 29. Counter electrode 33 (-
Pole) between them.

[0006] The incineration ash B generated in the incinerator or the incineration ash B collected by the dust collector is once collected in an ash container, and thereafter is put into the ash hopper 2 of the pusher type ash supply device 3 from the ash container. You. Incineration ash B put into ash hopper 2
Is continuously or intermittently fed into the plasma arc furnace 4 through the chute 7 by the ash supply device 3. Due to the high thermal energy of the plasma arc, the incinerated ash B containing oxides, high-melting substances, etc., becomes molten slag 34 in a molten state, and flows out continuously or intermittently from the slag discharge port 8 of the furnace body 29, and slag S It is taken out as outside. On the other hand, the exhaust gas (combustion gas) generated by melting the incineration ash B is sent from the exhaust gas outlet 9 to the exhaust gas treatment device through the exhaust gas duct, and after being purified, is discharged from the chimney to the atmosphere.

The concentration of the exhaust gas generated when the incineration ash B is melted differs depending on the type of the incineration ash B, but the concentration of the nitrogen oxide (N
The concentration of O _X) is generally 10000～20000Ppm, the concentration of hydrogen chloride (HCl) is 1000~10000ppm
, And the regulation value of the country (NO _X is 250ppm or less, HC
l is 430 ppm or less). Therefore, when exhaust gas is released into the atmosphere, NO contained in the exhaust gas
_X and HCl should be released after being subjected to a cleaning treatment so that the concentrations of _X and HCl are lower than the national regulation values.

As a means for treating the exhaust gas discharged from the plasma melting apparatus 1, there is a bag filter. In bag filters, harmful substances in exhaust gas are generally removed in two stages. As a first step, before the exhaust gas is introduced into the bag filter, slaked lime is sprayed into the flue to neutralize acidic components such as hydrogen chloride and sulfur oxides contained in the exhaust gas. Next, as a second step, the neutralized reaction product (CaCl ₂ , CaSO ₄ ) is captured on the surface of the filter cloth provided in the bag filter. However, although the bag filter is generally harmful substances such as HCl can be removed, it is impossible to remove NO _X in the gaseous state.

Conventionally, as an exhaust gas processing method for processing a NO _X discharged from the plasma melter 1, for example, those disclosed in Japanese Patent Laid-Open No. 2-192591 is known. In this exhaust gas treatment method, a reducing substance is supplied into the furnace, and the exhaust gas in the furnace is circulated into the furnace until the inside of the furnace is uniformly heated to react with the reducing substance to generate CO. , is that reduced NO _X. However, according to the above-mentioned exhaust gas treatment method, flammable and highly toxic CO is generated, which may cause explosion in a furnace or poisoning of a human body. Further, in order to make CO harmless, it is necessary to convert CO into CO ₂ by attaching a secondary combustion furnace or the like.

[0010] On the contrary, without causing the above problems, another exhaust gas treatment process capable of processing NO _X, for example, there is an exhaust gas treatment method using the denitration apparatus. The denitration apparatus uses ammonia (NH ₃ ) as a reducing agent, and the NOx contained in exhaust gas
_X is selectively decomposed into harmless nitrogen (N ₂ ) and water vapor (H ₂ O).

By the way, since the exhaust gas discharged from the plasma melting device has a very high temperature (1500 ° C.), if it is sent as it is to the bag filter, the bag filter will be broken. Even though the filter cloth of the bag filter can withstand the high temperature of the exhaust gas, it is limited to 250 ° C. Therefore, in order to protect the bag filter, it is necessary to cool the exhaust gas and introduce the exhaust gas into the bag filter. Therefore, conventionally, as a method of cooling exhaust gas, for example,
Japanese Patent Application Laid-Open No. 3-186191 has been developed. In the exhaust gas cooling method, as shown in FIG. 6, the exhaust gas is cooled using a water-cooled heat exchanger 35. 6 shows the heat exchanger 35,
The lower diagram shows the temperature change. Here, symbols T and T 'indicate the temperature of the exhaust gas, and symbols t and t' indicate the temperature of the cooling water. The exhaust gas passes through the heat exchanger 35 from the exhaust gas inlet 24 and is discharged from the exhaust gas outlet 26. On the other hand, the cooling water enters the water cooling jacket 37 from the water inlet 36 and is discharged from the water outlet 38. The heat exchanger 35 configured as described above is installed in the exhaust gas duct connecting the plasma arc furnace and the bag filter, and the exhaust gas is cooled by the heat exchanger 35 to 1000 ° C. or less by indirect cooling.

[0012]

However, as described above, according to the exhaust gas cooling system shown in FIG. 6, the exhaust gas temperature when introduced into the bag filter is set to be equal to or lower than the heat-resistant temperature of the bag filter, that is, 250 ° C. In addition, it is difficult to instantaneously lower the temperature of exhaust gas using a heat exchanger. The main component of fly ash discharged from the plasma arc furnace is
It is a mixture of salts such as NaCl, KCl, Na ₂ SO ₄ , and K ₂ SO _4. The melting point of these mixtures is 600 ° C., the boiling point is about 1200 ° C., and the temperature in the plasma arc furnace is as described above. Since the temperature is 1500 ° C., those fly ash are gaseous. Therefore, the flue gas discharged from the plasma arc furnace must pass through the temperature of the melting point of fly ash before passing through the flue gas duct and reaching the bag filter. The problem of fusing to the pipe wall surface of the exhaust gas duct and blocking or corroding the exhaust gas duct occurs.

An object of the present invention is to solve the above problems,
Prior to sending the exhaust gas discharged from the melting furnace to the bag filter, a large amount of cooling air is blown to instantly cool and dilute the exhaust gas, and the substance contained in the exhaust gas, so-called fly ash, becomes molten. These gases are instantaneously solidified without any time, preventing the melt from adhering to exhaust gas ducts, etc. In addition, by diluting and cooling the exhaust gas, the adverse effects of high temperature of the exhaust gas on the bag filter are eliminated. It is an object of the present invention to provide a method for treating exhaust gas from a melting furnace.

[0014]

SUMMARY OF THE INVENTION The present invention relates to an exhaust gas treatment method for a melting furnace, which melts incinerated ash generated by incinerating municipal solid waste, sewage sludge, or other waste in an incinerator. Cooling air is blown into the exhaust gas exhausted from the furnace to dilute the exhaust gas by a factor of 5 to 50 and cool it, solidify the gaseous substances contained in the exhaust gas by cooling the exhaust gas, and then dilute and cool the exhaust gas. And further purifying the exhaust gas by sending the exhaust gas to a bag filter to remove the solidified substance.

[0015] Further, in this exhaust gas treatment method for a melting furnace,
The temperature of the exhaust gas after diluting the exhaust gas with the cooling air is about 500 ° C. or less. In this exhaust gas treatment method for a melting furnace, the temperature of the exhaust gas after being diluted 5 to 50 times with the cooling air is 500 ° C. since the melting point of the salt mixture which is a main component of fly ash is about 600 ° C. It is preferable to set the following. Also, in consideration of the heat resistance of the bag filter, the temperature of the exhaust gas further decreases as the exhaust gas proceeds downstream, so that the temperature becomes 250 ° C. or less, which is a preferable state.

Further, the present invention relates to municipal waste, sewage sludge,
Alternatively, in an exhaust gas treatment method for a melting furnace in which incineration ash generated by incinerating other waste in an incinerator, cooling air is blown into the exhaust gas discharged from the melting furnace to reduce the temperature of the exhaust gas to about 500 ° C. ° C or lower, and solidification of gaseous substances contained in the exhaust gas by cooling the exhaust gas, and then sending the diluted and cooled exhaust gas to a bag filter to remove the solidified substance and remove the exhaust gas. The present invention relates to a method for treating flue gas in a melting furnace, characterized by purifying wastewater.

Since the method for treating exhaust gas from the melting furnace is configured as described above, a large amount of cooling air is mixed with the exhaust gas discharged from the melting furnace, and the exhaust gas is diluted 5 to 50 times. This instantaneously cools and dilutes the exhaust gas. As a result, a mixture of salts such as NaCl, which is a main component of the gaseous substance contained in the exhaust gas, instantaneously passes through the molten state and changes from a gas to a solid at a stretch. Ash is less likely to adhere.

In the method for treating exhaust gas of the melting furnace, the concentration of nitrogen oxides in the exhaust gas after diluting the exhaust gas with the cooling air is about 5000 ppm or less. The concentration of nitrogen oxides after dilution with the cooling air is 500
0 ppm or less, preferably 2000 ppm. Further, the concentration of hydrogen chloride after dilution with the cooling air is adjusted to be 500 ppm or less, preferably 200 ppm or less.

The concentration of HCl at the exhaust gas outlet of the melting furnace is 1000 to 10000 ppm.
It can only be removed down to about ppm, which is the national regulation value of 43
0 ppm cannot be achieved. However, by diluting the exhaust gas with cooling air by 5 to 50 times in a standard condition to cool and treat the diluted exhaust gas, the HCl concentration at the exhaust gas outlet of the melting furnace can be reduced to 500 ppm or less. Therefore, the concentration of HCl after the dehydrochlorination treatment by the bag filter can be reduced to 100 ppm or less, and the regulation value can be sufficiently cleared.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for treating exhaust gas of a melting furnace according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing one embodiment of an exhaust gas treatment method for a melting furnace according to the present invention, and shows an entire exhaust gas treatment system. FIG. 2 is an enlarged view of a region denoted by reference numeral A in FIG. Although the melting furnace incorporating the exhaust gas treatment method according to the present invention is described in the embodiment as a plasma melting furnace, it can be applied to a melting furnace such as a cyclone furnace or an electric furnace.

The plasma melting furnace 1 includes an ash hopper 2, an ash supply device 3, a plasma arc furnace 4, a plasma torch 5, a slag generator 6, and the like. The plasma arc furnace 4 has an incineration ash charging chute 7, a slag discharge port 8, and an exhaust gas outlet 9. Since the structure of the plasma melting furnace 1 is basically the same as that described in FIG. 5, the description thereof is omitted.

A gas cooler 10 is connected to an exhaust gas outlet 9 of the plasma arc furnace 4. In the gas cooler 10,
A cooling air supply pipe 11 for supplying cooling air and an exhaust gas duct 12 for guiding exhaust gas diluted with the cooling air to a bag filter 14 are connected. In FIG. 2, the exhaust gas outlet 9 and the cooling air supply pipe 11 appear to be arranged to face each other, but they are arranged to be shifted.
The gas cooler 10 is provided with a mixing chamber 13 in which the cooling air supplied through the cooling air supply pipe 11 and the exhaust gas discharged from the plasma arc furnace 4 are mixed. The exhaust gas diluted by the cooling air is sent to the bag filter 14 through the exhaust gas duct 12.

If necessary, a temperature sensor 15 is provided in the exhaust gas duct 12 near the inlet of the bag filter 14, and the temperature of the exhaust gas supplied to the bag filter 14 is measured. On the other hand, the cooling air supply pipe 11 is also provided with a temperature sensor 16 for measuring the temperature of the cooling air supplied to the gas cooler 10. Also, the cooling air supply pipe 11
Is provided with a valve 17, and the opening of the valve 17 is automatically adjusted based on the measured temperature so that the supply amount of cooling air can be adjusted. That is, the supply amount of the cooling air is adjusted so that the temperature measured by the temperature sensor 15 becomes 250 ° C. or less. At that time, the dilution ratio of the exhaust gas is set in a range of about 5 to 50 times.

The bag filter 14 is for removing harmful substances of acidic components such as HCl from the exhaust gas, and slaked lime [(Ca (OH) ₂ ]) is contained in the exhaust gas immediately before the exhaust gas is introduced into the bag filter 14. That is, slaked lime stored in the slaked lime storage tank 18 is pushed out by the slaked lime feeder 19 and sprayed into the exhaust gas duct 12 by the slaked lime blower 20. Thereby, acid such as HCl contained in the exhaust gas is discharged. The components are neutralized, and the neutralized reaction products (such as CaCl ₂ ) are captured on the surface of the filter cloth provided in the bag filter.
Cl is removed.

The exhaust gas discharged from the bag filter 14 is subsequently introduced into the denitration device 21. Immediately before the exhaust gas is introduced into the denitration device 21, the ammonia gas supply device 2
4 sprays ammonia gas (NH ₃ ). In the denitration unit 21, the exhaust gas contacts the denitration catalyst to reduce the concentration of NO _X contained in the exhaust gas. That is, the exhaust gas processed by the bag filter 14 is then processed by the denitration device 21. If a special bag filter having a denitration catalyst is used, the exhaust gas is processed by the denitration device. Of course, there is no need to do this.

Further, the concentration of the NO _X in the exhaust gas outlet 9 of the plasma melting furnace 1, 10000～20000Ppm
, And the can only remove up to about 1000ppm be directly denitration exhaust gas containing NO _X in such concentrations,
The regulated value of 250 ppm cannot be achieved.
However, the exhaust gas is diluted 5 to 50 times with cooling air, cooled, and treated, whereby the plasma melting furnace 1 is cooled.
The concentration of NO _X exhaust gas discharged from the exhaust gas outlet 9 5
000 ppm or less. Therefore, NO _X concentration after denitration by a bag filter or the denitration apparatus 21 with the de-nitrification function is reduced to 50ppm or less, it is possible to sufficiently clear limits for the country.

The exhaust gas discharged from the plasma arc furnace 4 in this manner is supplied to the bag filter 14 and the denitration device 2.
1, is attracted by the induction blower 22,
Released from the chimney 23 into the atmosphere.

FIG. 3 is a diagram showing the temperature change of the exhaust gas in the gas cooler 10, wherein the upper diagram shows the gas cooler 10 and the lower diagram shows the temperature change. Here, the symbol T
And T ′ indicate the temperature of the exhaust gas. Exhaust gas enters the mixing chamber 13 from the exhaust gas inlet 24 of the gas cooler 10, while cooling air enters the mixing chamber 13 from the cooling air inlet 25, where the exhaust gas is diluted with cooling air and discharged from the exhaust gas outlet 26. Is done. As you can see in Figure 3,
The temperature of the exhaust gas is instantaneously
From T to T '. It can be seen that the temperature drop occurs more rapidly than in the prior art using the heat exchanger 35 (see FIG. 6). Therefore, the gaseous fly ash contained in the exhaust gas instantaneously passes from the gas state to the molten state, and solidifies, that is, changes into particles at once, and the inner wall of the mixing chamber 13 of the gas cooler 10 and the exhaust gas duct A mixture of salts such as NaCl, KCl, Na ₂ SO ₄ , and K ₂ SO ₄ hardly adheres to the inner wall of No. 12.

Next, an example in which municipal solid waste incineration ash is melted using the plasma melting furnace 1 having a maximum plasma output of 1500 kW and a processing capacity of 1.5 t / h will be described with reference to FIG. Municipal solid waste incineration ash is supplied by the ash supply device 3
Is continuously or intermittently charged into the plasma arc furnace 4. The injected municipal waste incineration ash is melted by the thermal energy of the plasma arc formed between the plasma torch 5 and the counter electrode. The melted incineration ash overflows from the plasma arc furnace 4 and is discharged to the slag generator 6. On the other hand, the exhaust gas is diluted in the gas cooler 10 by a dilution factor of 5%.
After being instantaneously cooled by double to 20 times the cooling air,
It is dust with HCl in bag filter 14 is removed, and further NO _X is removed by the denitration apparatus 21, and is discharged from a chimney into the atmosphere.

When the incinerated ash was melt-processed using the plasma melting furnace 1 at a plasma output of 1000 kW and a processing amount of 1 t / h, the exhaust gas temperature at the outlet of the plasma arc furnace 4 was 1500 ° C., the HCl concentration was 10000 ppm, and NO _X
The concentration was 20000 ppm. The exhaust gas was cooled to 200 ° C. using a water-cooled heat exchanger 35 without air dilution, and gas was passed.
The inner wall of the was closed and operation was disabled. In addition, H after cooling
Cl concentration and NO _X concentration is not changed, respectively 1000
It was 0 ppm and 20,000 ppm. Slaked lime 50 kg / Hr and ammonia 1.5
As a result of exhaust gas treatment by adding Nm ³ / Hr, H
Cl concentration 3000 ppm, the concentration of the same NO _X 12
It was 00 ppm, which was much higher than the national standard.
On the other hand, the exhaust gas is instantaneously reduced to 10
Diluted twice, exhaust gas temperature 200 ℃, HCl concentration 1
000ppm, and the NO _X concentration of 2000ppm. In this case, even if the operation is performed for one year or more, no blockage trouble of the gas cooler 10 and the exhaust gas duct 12 occurs, and, similarly to the above case, slaked lime 50 kg / Hr and ammonia 1.5 Nm ³ / As a result of exhaust gas treatment with addition of Hr, HC
l concentration 100 ppm, NO _X concentration can be reduced to 5 ppm.

Next, another embodiment of the exhaust gas treatment method for a melting furnace according to the present invention will be described with reference to FIG.
FIG. 4 is a schematic diagram showing the entire exhaust gas treatment system.
In the exhaust gas treatment system of the embodiment shown in FIG. 1, a cyclone 27 is provided upstream of the bag filter 14. Therefore, the only difference between this embodiment and the above embodiment is whether or not the cyclone 27 is provided. That is, in this embodiment, the diluted exhaust gas is
After removing particulate matter of the solidified substance from the exhaust gas through the filter, the exhaust gas is sent to a bag filter for purification. Of course, as in this embodiment, the exhaust gas diluted with the cooling air may be introduced into the bag filter 14 via the cyclone 27, or may be directly introduced into the bag filter 14 without providing the cyclone. Good. When the cyclone 27 is installed, solidified particulate matter accumulates on the bottom of the cyclone 27, so that the load on the bag filter 14 can be reduced correspondingly.

The cyclone 27 is disposed between the gas cooler 10 and the slaked lime supply part, is provided in the middle of the exhaust gas duct 12, and has a rotary valve 28 at the bottom. Since the temperature of the exhaust gas is instantaneously reduced by the gas cooler 10 and the gaseous fly ash contained in the exhaust gas is instantaneously turned into solid particles, the provision of the cyclone 27 makes the bottom of the cyclone 27 Particulate solids accumulate.
The solid accumulated at the bottom of the cyclone 27 can be removed by opening the rotary valve 28. An advantage of this embodiment is that the load on the bag filter 14 can be reduced by providing the cyclone 27.

Further, as in the above embodiment, cyclone 2
2 is omitted in FIG. 2 instead of being provided in the middle of the exhaust gas duct, but a cyclone may be provided below the mixing chamber 13 of the gas cooler 10 to take out fly ash in the form of solid particles. Good.

[0034]

The exhaust gas treatment method for a melting furnace according to the present invention is configured as described above, so that a large amount of cooling air is mixed with the exhaust gas discharged from the melting furnace, and the cooling air is mixed 5 to 50 times.
By diluting and cooling the exhaust gas twice or cooling the exhaust gas temperature to about 500 ° C or less, the mixture of salts such as NaCl, which is the main component of fly ash contained in the exhaust gas, changes from a gas state to a molten state. Since it passes instantaneously and changes into a solid at a stretch, salts, which are the main components of fly ash, are unlikely to adhere to the exhaust gas duct or the inner wall surface of the gas cooler. Also, by diluting 50-fold from 5 times to exhaust the cooling air, reduces the NO _X concentration at the exhaust gas outlet of the melting furnace, thereby improving the denitration efficiency, reduces the HCl concentration in the exhaust gas outlet of the melting furnace, Dehydrochlorination efficiency is improved. Therefore, it is possible to prevent the exhaust gas dust and the tube wall of the gas cooler from being clogged or corroded by salts, and to operate the melting system for a long time without having to stop and clean the operation. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of an exhaust gas treatment method for a melting furnace according to the present invention and showing an entire exhaust gas treatment system.

FIG. 2 is an enlarged view of a region indicated by reference numeral A in FIG.

FIG. 3 is a schematic diagram of a gas cooler in a melting furnace and an explanatory diagram showing a temperature change when the gas cooler is used.

FIG. 4 is a schematic diagram showing another embodiment of the exhaust gas treatment method for a melting furnace according to the present invention, and showing the entire exhaust gas treatment system.

FIG. 5 is a sectional view of a melting furnace.

FIG. 6 is a schematic diagram of a conventional water-cooled heat exchanger and a diagram showing a temperature change when the heat exchanger is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plasma melting furnace 2 Ash hopper 4 Plasma arc furnace 5 Plasma torch 8 Slag discharge port 9 Exhaust gas outlet 10 Gas cooler 11 Cooling air supply pipe 12 Exhaust gas duct 13 Mixing chamber 14 Bag filter 18 Slaked lime storage tank 19 Slaked lime feeder 20 Slaked lime blower 21 Denitration Equipment 22 Induced blower 27 Cyclone 28 Rotary valve

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshihiro Kawase 1-6-27 Konan, Minato-ku, Tokyo Inside Ebara Infilco Co., Ltd. (56) References JP-A-5-253557 (JP, A) 57-114230 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23J 15/00

Claims (3)

(57) [Claims] 1. An exhaust gas treatment method for a melting furnace for melting and treating incinerated ash generated by incinerating municipal solid waste, sewage sludge, or other waste in an incinerator, wherein the exhaust gas discharged from the melting furnace is cooled. said by blowing air
Exhaust gas is diluted 5 to 50 times and cooled.
Cooling the gaseous substances contained in the exhaust gas
And then the diluted and cooled exhaust gas is sent to a bag filter to remove the solidified material.
An exhaust gas treatment method for a melting furnace, comprising purifying the exhaust gas. 2. After dilution of said exhaust gas with said cooling air
The method of claim 1, wherein the temperature of the exhaust gas is about 500 ° C. or less . (3) Municipal waste, sewage sludge, or other waste
Incineration ash generated by incineration of waste in incinerators
In the exhaust gas treatment method for a melting furnace for performing a melting process,
Blowing cooling air into the exhaust gas exhausted from the melting furnace
The temperature of the exhaust gas is cooled to about 500 ° C or less,
The gaseous substance contained in the exhaust gas is cooled to a solid
The diluted and cooled exhaust gas is then bagfed.
To remove the solidified material
Exhaust gas treatment method of the soluble Toruro you characterized by purifying exhaust gas.