JP2003320211A - Exhaust gas treatment method and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high performance exhaust gas treatment method for efficiently removing PM (particulate matter) contained in exhaust gas, and to make an exhaust gas treatment apparatus compact, simple and inexpensive. <P>SOLUTION: The exhaust gas treatment apparatus has an apparatus main body, in which a particle bed 10 comprising particles for capturing particulates contained in exhaust gas, a gas dispersion plate 12 provided under the particle bed, the wind box 6 under the gas dispersion plate and a scattering preventing plate 18 above the particle bed are provided, and the exhaust gas is introduced from the area under the gas dispersion plate 12 to bring the particle bed 10 to a fluidized bed and particulates in the exhaust gas are captured while passing treated gas to the area above the particle bed to discharge the same. A heating member 22 having air permeability is provided to the undersurface of the gas dispersion plate 12. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to solid carbon (soot), SOF, and sulfate contained in exhaust gas discharged from combustion devices such as diesel engines, gasoline engines, marine engines, gas turbines, boilers, and combustion furnaces. Exhaust gas treatment method capable of efficiently removing such fine particles (PM) with high performance, downsizing and simplification of the apparatus, and denitration of treated exhaust gas And the device.

[0002]

2. Description of the Related Art For example, in a diesel engine, a large amount of fine particles (PM) of 1 μm or less made of solid carbon are generated when the load fluctuates, and are discharged to the atmosphere together with exhaust gas, which is a problem. As a conventionally known PM removal technique, there is a method of collecting PM in engine exhaust gas by using a filter and burning the PM collected by the filter to process the PM (Japanese Utility Model Publication No. 5-13934). , JP-A-7-286512).

Further, in Japanese Patent Laid-Open No. 4019/1992, a fluidized bed is provided downstream of exhaust gas, in which particles carrying a combustion catalyst on a spherical ceramic surface are fluidized by exhaust gas introduced from below, and the fluidized bed is formed. A fixed layer composed of particles supporting an oxidation catalyst on the surface of the foamed ceramic is provided downstream of the layer,
An exhaust gas purifying apparatus is disclosed which is provided with means for heating the fluidized bed and the fixed bed.

[0004]

The PM removal technique using the filter described above requires a filter having a large area, which increases the size of the apparatus. In addition, the filter is likely to be clogged, resulting in an increase in pressure loss and deterioration in performance. Further, although a ceramic fiber resistant to high temperature is used for the filter, this type of filter has low durability, high price, and high cost. Further, there is a problem that the complete combustion of PM cannot be performed well even in the combustion process of PM collected in the filter.

Further, in the above exhaust gas purifying apparatus using a fluidized bed and a fixed bed, the carbon particles captured in the fluidized bed reduce the nitrogen oxides in the exhaust gas to nitrogen, and the carbon particles are oxidized to carbon monoxide or carbon dioxide gas. The carbon monoxide is also oxidized to carbon dioxide in the fixed bed, and the purified gas is discharged.
The technical idea is basically different from the removal method in which the PM in the exhaust gas is captured in the fluidized bed and the PM adhering to the fluidized medium is burned.

In view of the above points, the applicant of the present invention has a particle layer made of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, and a wind box below the gas dispersion plate. , A scattering prevention plate above the particle layer is provided in the main body of the apparatus, and the exhaust gas is introduced from below the gas dispersion plate to form a fluidized bed of the particle layer so that the particles in the exhaust gas are captured and the processing gas is above the particle layer. We have already developed an exhaust gas treatment device that allows the exhaust gas to be discharged into the exhaust gas.

However, in this exhaust gas treating apparatus, when the exhaust gas temperature is low, for example, below 400 ° C., PM adheres and accumulates on the back surface (lower surface) of the gas dispersion plate, and the dispersion plate is apt to become clogged. is there. Further, NOx is contained in the processing gas discharged from the exhaust gas processing device, and a denitration device must be separately provided. In addition, the entire device, especially the height of the device, increases,
There are problems such as requiring an installation area.

The present invention has been made in view of the above points, and an object of the present invention is to provide a simple structure utilizing a fluidized bed,
Solid carbon (soot), SOF, and fine particles (PM) such as sunfate contained in the exhaust gas can be removed efficiently and with high performance, and at the same time, the cost is low, and the device is made compact and simple. An object of the present invention is to provide an exhaust gas treatment method and apparatus that can perform denitration of a treatment gas.

[0009]

In order to achieve the above-mentioned object, the method of the present invention uses a particle layer in which particles for trapping fine particles contained in exhaust gas are deposited on a gas dispersion plate in a wind box. An exhaust gas treatment method in which the exhaust gas is introduced from below the gas dispersion plate, the fine particles are captured by a particle layer fluidized by the exhaust gas, and the processing gas from which the fine particles have been removed is passed over the particle layer and discharged. And the gas dispersion plate is 4
By heating and controlling in the range of 00 to 550 ° C., the fine particles adhering to the lower surface of the gas dispersion plate are burned and removed (see FIG. 1).

Further, the method of the present invention introduces the exhaust gas from below the gas dispersion plate into a particle layer in which particles for capturing fine particles contained in the exhaust gas are deposited on the gas dispersion plate in the wind box, An exhaust gas treatment method in which the fine particles are captured by a particle layer fluidized by exhaust gas, and the processing gas from which the fine particles have been removed is caused to flow over the particle layer and discharged, and which adheres to the lower surface of the gas dispersion plate. It is characterized by scraping off existing fine particles (see FIGS. 2 to 4).

Further, in the method of the present invention, the exhaust gas is introduced from below the gas dispersion plate into a particle layer in which particles for trapping fine particles contained in the exhaust gas are deposited on the gas dispersion plate in the wind box, An exhaust gas treatment method in which the fine particles are captured in a particle layer fluidized by exhaust gas, and a processing gas from which the fine particles are removed is passed over the particle layer and discharged, wherein the exhaust gas before being introduced into the particle layer The method is characterized in that a reducing agent is blown into and the processing gas from which fine particles have been removed is brought into contact with a reducing catalyst to perform denitration processing (see FIG. 5).

In the method of the present invention, the particles for capturing fine particles contained in the exhaust gas are introduced into the particle layer in which the particles are deposited on the gas dispersion plate in the wind box from below the gas dispersion plate, An exhaust gas treatment method in which the fine particles are captured in a particle layer fluidized by exhaust gas, and the processing gas from which the fine particles have been removed is passed over the particle layer and discharged, either directly from the exhaust gas introduction pipe or by introducing the exhaust gas. The flow rate of the exhaust gas is reduced by introducing the exhaust gas from the pipe into the wind box through the modified joint (see FIGS. 6 to 11).

Further, in the method of the present invention, the exhaust gas is introduced from below the gas dispersion plate into a particle layer in which particles for capturing fine particles contained in the exhaust gas are deposited on the gas dispersion plate in the wind box, An exhaust gas treatment method of trapping the fine particles in a particle layer fluidized by exhaust gas, discharging the processing gas from which the fine particles have been removed by passing it over the particle layer, and having an appropriate fluidized state The particles are mixed with particles having an average particle size larger than the average particle size to form a particle layer.

The apparatus of the present invention comprises a particle layer composed of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and an upper part of the particle layer. An anti-scattering plate is provided in the main body of the apparatus, the exhaust gas is introduced from below the gas dispersion plate, the particle layer becomes a fluidized bed, and the fine particles in the exhaust gas are captured, and the processing gas is passed over the particle layer. An exhaust gas treatment device designed to be discharged,
It is characterized in that a heating member having air permeability is provided on the lower surface of the gas dispersion plate (see FIG. 1).

Further, the apparatus of the present invention comprises a particle layer made of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a particle layer. An upper anti-scattering plate is provided in the main body of the device, and the exhaust gas is introduced from below the gas dispersion plate, and the particle layer becomes a fluidized bed, trapping the fine particles in the exhaust gas and allowing the processing gas to flow over the particle layer. The exhaust gas treatment device is configured to be discharged by being made to discharge by a scraping device provided on the lower surface of the gas dispersion plate (see FIGS. 2 to 4).

Further, the apparatus of the present invention comprises a particle layer composed of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a particle layer. An upper anti-scattering plate is provided in the main body of the device, and the exhaust gas is introduced from below the gas dispersion plate, and the particle layer becomes a fluidized bed, trapping the fine particles in the exhaust gas and allowing the processing gas to flow over the particle layer. An exhaust gas treatment device configured to be discharged by allowing a reducing agent supply pipe to be connected to an exhaust gas introduction port for introducing exhaust gas into a wind box or in the vicinity thereof, and a reduction catalyst provided in a space above a shatterproof plate. This is characterized (see FIG. 5).
The reduction catalyst preferably has a honeycomb shape.

Further, the apparatus of the present invention comprises a particle layer composed of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a particle layer. An upper anti-scattering plate is provided in the main body of the device, and the exhaust gas is introduced from below the gas dispersion plate, and the particle layer becomes a fluidized bed, trapping the fine particles in the exhaust gas and allowing the processing gas to flow over the particle layer. An exhaust gas treatment device configured to discharge the exhaust gas by forming a diffuser section in the wind box below the gas distribution plate in parallel with the gas distribution plate and forming a diffuser-shaped guide vane. An exhaust gas introduction pipe is connected to the introduction port through a modified joint having a small diameter on the upstream side of the exhaust gas (see FIGS. 6 and 7).

Further, the apparatus of the present invention comprises a particle layer composed of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a particle layer. An upper anti-scattering plate is provided in the main body of the device, and the exhaust gas is introduced from below the gas dispersion plate, and the particle layer becomes a fluidized bed, trapping the fine particles in the exhaust gas and allowing the processing gas to flow over the particle layer. An exhaust gas treatment device configured to discharge the exhaust gas by forming a diffuser section below the gas dispersion plate in the wind box in parallel with the gas dispersion plate and forming a diffuser-shaped guide vane. A feature is that an exhaust gas introduction pipe in a substantially horizontal direction that is substantially orthogonal to the exhaust gas introduction port is connected to the introduction port (see FIGS. 8 and 9).

Further, the apparatus of the present invention comprises a particle layer composed of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a particle layer. An upper anti-scattering plate is provided in the main body of the device, and the exhaust gas is introduced from below the gas dispersion plate, and the particle layer becomes a fluidized bed, trapping the fine particles in the exhaust gas and allowing the processing gas to flow over the particle layer. In the exhaust gas treatment device configured to be discharged by making it possible to form a plurality of diffuser parts by providing a plurality of guide vanes having a diverging shape in parallel with the gas dispersion plate below the gas dispersion plate in the wind box. Characteristic (Fig. 10,
(See FIG. 11).

Further, the apparatus of the present invention comprises a particle layer composed of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a particle layer. An upper anti-scattering plate is provided in the main body of the device, and the exhaust gas is introduced from below the gas dispersion plate, and the particle layer becomes a fluidized bed, trapping the fine particles in the exhaust gas and allowing the processing gas to flow over the particle layer. An exhaust gas treatment device adapted to be discharged by means of 30-70 wt% particles with a particle size of 0.3-0.5 mm
And 70 to 30 wt% of particles having a particle diameter of 0.5 to 1.0 mm are mixed to form a particle layer.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments, and can be appropriately modified and implemented. . FIG. 1 shows an exhaust gas treating apparatus according to a first embodiment of the present invention. As shown in FIG. 1, a particle layer 10 in which particles made of alumina, silica, zeolite, zirconia, sintered metal or the like having a particle diameter of 0.3 to 1 mm are deposited.
However, it is provided on the gas dispersion plate 12 in which numerous small holes are formed by etching or the like. This gas dispersion plate 1
Although 2 is made of iron, stainless steel or the like, it is preferably made of stainless steel from the viewpoint of heat resistance.

The exhaust gas introduced into the wind box 16 from the exhaust gas inlet 14 uniformly enters the gas dispersion plate 12 from below. In addition, it is preferable that a horizontal guide vane is provided in the wind box so that the exhaust gas is uniformly introduced into the gas dispersion plate. The particle layer 10 on the upper side of the gas dispersion plate 12 becomes a fluidized bed when the exhaust gas flow rate becomes equal to or higher than the fluidization start speed, and PM in the exhaust gas is captured by the fluidized bed 10 forming the fluidized bed. The amount of PM emitted from the engine, which is the emission source of exhaust gas, and the combustion amount depending on the exhaust gas temperature / fluidized bed temperature are 300 to 450.
It is assumed that the temperature is balanced at about ℃, and when the exhaust gas temperature is 300 to 450 ℃ or less, the particles are heated by an electric heater (glow plug, sheath heater, etc.) installed in the fluidized bed 10 and adhered to the particles. It is preferable that the PM is burned for regeneration. The exhaust gas from which the PM has been removed passes through the particle (fluid medium) scattering prevention plate 18 and is discharged from the exhaust gas discharge port 20. As the shatterproof plate 18, innumerable holes having a diameter slightly smaller than the smallest particle size of the fluidized medium are opened by etching or the like, and a perforated plate that repels the fluidized medium that scatters and collides is used. It As the gas dispersion plate 12, in addition to the dispersion plate formed by etching, an iron or stainless steel plate having a thickness of 1 mm or more and a long slit-like hole having a width of several hundred microns is formed, and a thickness of about 1 mm. It is possible to use a plate in which a number of round holes are made with a laser.

In the exhaust gas treating apparatus configured as described above, the heating member 22 having air permeability is provided on the lower surface (back surface) of the gas dispersion plate 12. Then, the gas dispersion plate 12 is heated and controlled in the range of 400 to 550 ° C. by the heating member 22, and the fine particles (PM) adhering to and deposited on the lower surface of the gas dispersion plate 12 are burned and removed. If the temperature of the gas dispersion plate 12 is less than 400 ° C., PM will not burn. On the other hand, when the temperature of the gas dispersion plate 12 exceeds 550 ° C., the gas dispersion plate 12
There is a problem of durability of the material such as stainless steel. Therefore, the temperature is automatically controlled to 400 to 550 ° C. As the air-permeable heating member 22, a heater such as a nichrome wire formed in a lattice shape or a wire mesh shape, a heat transfer heater, or the like is used.

FIG. 2 shows an example of an exhaust gas treating apparatus according to the second embodiment of the present invention, which is a bottom surface (back surface) of the gas dispersion plate 12.
Is shown. In the present embodiment, instead of the heating member in the first embodiment, a scraping device 24 is provided on the lower surface (back surface) of the gas dispersion plate 12. Then, the scraping device 24 is moved in parallel with the plane of the lower surface of the gas dispersion plate 12, and the PM adhering to and accumulated on the lower surface of the gas dispersion plate 12 is scraped and dropped. A scraper, a brush or the like is used as the scraping device 24, and a material that can withstand 550 ° C.,
For example, it is preferable to use stainless steel or the like.
Other configurations and operations are similar to those of the first embodiment.

As shown in FIG. 2, instead of the scraping device that moves parallel to the plane of the gas dispersion plate, as shown in FIG. 3, the scraping device 2 that slides on the lower surface of the gas dispersion plate 12a and rotates.
4a may be provided. Further, as shown in FIG. 4, the entire apparatus may be cylindrical and the gas dispersion plate 12b may be circular.

FIG. 5 shows an exhaust gas treating apparatus according to the third embodiment of the present invention. As shown in FIG. 5, the wind box 1
A reducing agent supply pipe 26 is connected to the exhaust gas introducing port 14 for introducing the exhaust gas to 6 or the vicinity thereof, while a reducing catalyst 30 is provided in a space 28 above the scattering prevention plate 18. As the reduction catalyst 30, a honeycomb-shaped body, a granular material packed layer, or the like is used, but it is preferable to use a honeycomb-shaped body capable of reducing the pressure loss. A reducing agent such as urea or ammonia is blown into the exhaust gas from the reducing agent supply pipe 26,
While the exhaust gas passes through the particle bed (fluidized bed) 10, the reducing agent is uniformly dispersed in the exhaust gas, passes through the reduction catalyst 30, and is subjected to high-performance denitration treatment. Since the reducing agent can be uniformly dispersed by the fluidized bed, the denitration effect can be enhanced. Other configurations and operations are similar to those of the first or second embodiment. That is, it is preferable to provide a heating member or a scraping device having air permeability on the lower surface of the gas dispersion plate.

FIG. 6 shows an exhaust gas treating apparatus according to a fourth embodiment of the present invention, and FIG. 7 shows a cross section taken along the line AA in FIG. In the present embodiment, a guide vane 32 having a diverging shape is provided in parallel with the gas distribution plate 12 to form a diffuser portion 34, and the exhaust gas inlet 14 of the diffuser portion 34 has a deformed joint 36 with a small diameter on the upstream side of the exhaust gas.
The exhaust gas introduction pipe 38 is connected via
By introducing the exhaust gas into the wind box 16 via the deformed joint 36, the flow velocity of the exhaust gas is reduced. In the preceding exhaust gas treatment device, since the curved guide vanes were provided in the wind box or the exhaust gas header was provided, the height of the wind box, and thus the height of the entire device, was high. In the present embodiment, the height of the wind box can be reduced, and thus the height of the entire device can be reduced. Moreover, the height of the apparatus can be further reduced by using the deformed joint for the exhaust gas outlet. Other configurations and actions are similar to those of the first or second embodiment and the third embodiment.

FIG. 8 shows an exhaust gas treating apparatus according to a fifth embodiment of the present invention, and FIG. 9 shows a cross section taken along line BB in FIG. In the present embodiment, the exhaust gas introduction port 14 of the diffuser portion 34 is connected to an exhaust gas introduction pipe 38a in a substantially horizontal direction that is substantially orthogonal to the introduction port 14. Other configurations and operations are similar to those of the fourth embodiment.

FIG. 10 shows an exhaust gas treating apparatus according to a sixth embodiment of the present invention, and FIG. 11 shows C- in FIG.
The C line cross section is shown. In this embodiment, a plurality of guide vanes 32a and 32b (two as an example in the drawing) having a diverging shape are provided below the gas distribution plate 12 in the wind box 16 in parallel with the gas distribution plate 12 (a plurality of guide vanes in the drawing). 2 as an example
The individual diffuser parts 34a and 34b are formed. In this embodiment, the width W of the device can be reduced, and the device can be made compact. Other configurations and operations are similar to those of the fourth and fifth embodiments.

Next, an exhaust gas treating apparatus according to the seventh embodiment of the present invention will be described. In this embodiment, the particle size is 0.3 to
Particles of 0.5 mm (for example, alumina) 30 to 70 wt%, preferably 40 to 60 wt% and particles of 0.5 to 1.0 mm (for example, alumina) 70 to 30 wt%, preferably 60
˜40 wt% is mixed to form a particle layer. That is, by mixing particles having an average particle size that achieves an appropriate flow state and particles having an average particle size larger than this average particle size to form a particle layer, the overall size of the device can be reduced while maintaining high performance. Can be achieved. In the above example,
Particles with a particle size of 0.3 to 0.5 mm are violently flowed to maintain the performance of the particles, while particles with a particle size of 0.5 to 1.0 mm are gently fluidized to realize downsizing of the apparatus. . Other configurations and operations are similar to those of the first to sixth embodiments.

[0031]

Since the present invention is configured as described above, it has the following effects. (1) With a simple structure using a fluidized bed, fine particles (PM) such as solid carbon (soot), SOF, and sulfate contained in exhaust gas can be removed efficiently and with high performance. , Equipment compactness, simplification,
Cost reduction can be achieved. (2) It is also possible to denitrate the treated exhaust gas in the exhaust gas treatment device.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration explanatory view showing an exhaust gas treatment apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a bottom surface (back surface) of a gas dispersion plate, which is an example of an exhaust gas treating apparatus according to a second embodiment of the present invention.

FIG. 3 is an explanatory view showing a bottom surface (back surface) of a gas dispersion plate in another example of the exhaust gas treating apparatus according to the second embodiment of the present invention.

FIG. 4 is an explanatory view showing a bottom surface (back surface) of a gas dispersion plate in still another example of the exhaust gas treating apparatus according to the second embodiment of the present invention.

FIG. 5 is a sectional configuration explanatory view showing an exhaust gas treating apparatus according to a third embodiment of the present invention.

FIG. 6 is a sectional configuration explanatory diagram showing an exhaust gas treatment apparatus according to a fourth embodiment of the present invention.

7 is a cross-sectional view taken along the line AA in FIG.

FIG. 8 is a sectional configuration explanatory diagram showing an exhaust gas treating apparatus according to a fifth embodiment of the present invention.

9 is a sectional view taken along line BB in FIG.

FIG. 10 is a sectional configuration explanatory diagram showing an exhaust gas treatment device according to a sixth embodiment of the present invention.

11 is a cross-sectional view taken along the line CC in FIG.

[Explanation of symbols]

10 particle layers 12, 12a, 12b Gas dispersion plate 14 Exhaust gas inlet 16 wind box 18 Shatterproof plate 20 Exhaust gas outlet 22 Heating member having air permeability 24, 24a scraping device 26 Reductant supply pipe 28 Space above the shatterproof plate 30 Reduction catalyst 32, 32a, 32b Guide vanes 34, 34a, 34b Diffuser part 36 Deformed joint 38, 38a Exhaust gas introduction pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F01N 3/24 F01N 3/24 L N 3/28 301C 3/28 301 B01D 53/36 101A F term (reference) ) 3G090 AA03 AA06 BA01 CB11 EA02 EA03 3G091 AA04 AA17 AA18 AB04 AB08 BA00 BA14 BA38 CA05 CA16 CA27 FB02 FC07 GA06 4D048 AA06 AA14 AB02 AC03 AC04 BB01 Q30 A01 QAQA30 A01 QA QAJB20 JA02 A10 QBJ JA02 JA02 JA02 JB02 JB02 J10B17 JA02 A10B30 JA02 JB02 JA02 A10B30 JA02 JB02 JA02 A10A34 A01 QBJAQBQAJAQBJAQAQAJAQBQJAQAQAQAQAQAQAQAQAQAJAQAQAJAQAQAQAQAQAQAQAQAQAQQQAQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQO

Claims (13)

[Claims] 1. Particles for trapping fine particles contained in exhaust gas are introduced into the particle layer deposited on the gas dispersion plate in the wind box from below the gas dispersion plate and fluidized by the exhaust gas. An exhaust gas treatment method of trapping the fine particles in a particle layer, flowing the treatment gas from which the fine particles have been removed to flow over the particle layer, and discharging the gas.
A method for treating exhaust gas, which comprises heating and controlling in the range of 0 ° C. to burn and remove fine particles adhering to the lower surface of the gas dispersion plate. 2. Particles for trapping fine particles contained in the exhaust gas are introduced into the particle layer deposited on the gas dispersion plate in the wind box from below the gas dispersion plate and fluidized by the exhaust gas. An exhaust gas treatment method in which the fine particles are captured in a particle layer, and the treatment gas from which the fine particles have been removed is passed over the particle layer and discharged, and the fine particles adhering to the lower surface of the gas dispersion plate are scraped off. An exhaust gas treatment method characterized by: 3. Particles for trapping fine particles contained in the exhaust gas are introduced into the particle layer deposited on the gas dispersion plate in the wind box from below the gas dispersion plate and fluidized by the exhaust gas. In the exhaust gas treatment method of trapping the fine particles in the particle layer, the processing gas from which the fine particles have been removed is passed over the particle layer and discharged, and a reducing agent is blown into the exhaust gas before being introduced into the particle layer, An exhaust gas treatment method, characterized in that a treatment gas from which fine particles have been removed is brought into contact with a reducing catalyst to perform denitration treatment. 4. Particles for trapping fine particles contained in the exhaust gas are introduced into the particle layer deposited on the gas dispersion plate in the wind box from below the gas dispersion plate and fluidized by the exhaust gas. An exhaust gas treatment method in which the fine particles are captured in a particle layer, and the processing gas from which the fine particles have been removed is allowed to flow over the particle layer and discharged, directly from the exhaust gas introduction pipe or through a modified joint from the exhaust gas introduction pipe. The exhaust gas treatment method is characterized by reducing the flow velocity of the exhaust gas by introducing the exhaust gas into the wind box. 5. Particles for trapping fine particles contained in exhaust gas are introduced into the particle layer deposited on the gas dispersion plate in the wind box from below the gas dispersion plate and fluidized by the exhaust gas. The exhaust gas treatment method of trapping the fine particles in the particle layer, discharging the treatment gas from which the fine particles have been removed by passing it over the particle layer, and the particles having an average particle diameter in a proper flow state, An exhaust gas treatment method, characterized in that a particle layer is formed by mixing particles having an average particle size larger than the particle size. 6. A particle layer composed of particles for capturing fine particles contained in exhaust gas, and a gas dispersion plate below the particle layer,
A wind box on the lower side of the gas dispersion plate and a shatterproof plate on the upper side of the particle layer are provided in the main body of the apparatus, and the exhaust gas is introduced from below the gas dispersion plate to form a fluidized bed of the particle layer and the fine particles in the exhaust gas. An exhaust gas treatment device for allowing the treated gas to flow through above a particle layer and to be discharged, wherein an exhaust gas treatment device is provided on the lower surface of a gas dispersion plate, the heating member having air permeability. . 7. A particle layer made of particles for capturing fine particles contained in exhaust gas, and a gas dispersion plate below the particle layer,
A wind box on the lower side of the gas dispersion plate and a shatterproof plate on the upper side of the particle layer are provided in the main body of the apparatus, and the exhaust gas is introduced from below the gas dispersion plate to form a fluidized bed of the particle layer and the fine particles in the exhaust gas. An exhaust gas treatment device, wherein the trapped and treated gas is made to flow over the particle layer and discharged, wherein an exhaust device is provided on the lower surface of the gas dispersion plate. 8. A particle layer made of particles for capturing fine particles contained in exhaust gas, and a gas dispersion plate below the particle layer,
A wind box on the lower side of the gas dispersion plate and a shatterproof plate on the upper side of the particle layer are provided in the main body of the apparatus, and the exhaust gas is introduced from below the gas dispersion plate to form a fluidized bed of the particle layer and the particles in the exhaust gas An exhaust gas treatment device in which the trapped and processed gas is discharged by flowing it over the particle layer, and a reducing agent supply pipe is connected to the exhaust gas introduction port for introducing the exhaust gas into the wind box or in the vicinity thereof to scatter. An exhaust gas treatment device, wherein a reduction catalyst is provided in a space above the prevention plate. 9. The reduction catalyst has a honeycomb shape.
Exhaust gas treatment device described. 10. A particle layer made of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a shatterproof plate above the particle layer. Is provided in the main body of the apparatus, the exhaust gas is introduced from below the gas dispersion plate, the particle layer becomes a fluidized bed, and the fine particles in the exhaust gas are trapped so that the processing gas is passed over the particle layer and discharged. In the exhaust gas treatment device according to the above, a diffuser section is formed by providing a guide vane having a diverging shape parallel to the gas dispersion plate below the gas dispersion plate in the wind box, and the exhaust gas upstream of the exhaust gas upstream of the diffuser section. An exhaust gas treatment device characterized in that an exhaust gas introduction pipe is connected through a modified joint having a small diameter on the side. 11. A particle layer made of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a shatterproof plate above the particle layer. Is provided in the main body of the apparatus, the exhaust gas is introduced from below the gas dispersion plate, the particle layer becomes a fluidized bed, and the fine particles in the exhaust gas are trapped so that the processing gas is passed over the particle layer and discharged. In the exhaust gas treatment device according to the above, a diffuser portion is formed by providing a guide vane having a diverging shape in parallel with the gas dispersion plate under the gas dispersion plate in the wind box, and the exhaust gas is introduced into the exhaust gas inlet of the diffuser portion. An exhaust gas treatment apparatus, characterized in that an exhaust gas introduction pipe in a substantially horizontal direction substantially orthogonal to the introduction port is connected. 12. A particle layer composed of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a shatterproof plate above the particle layer. Is provided in the main body of the apparatus, the exhaust gas is introduced from below the gas dispersion plate, the particle layer becomes a fluidized bed, and the fine particles in the exhaust gas are trapped so that the processing gas is passed over the particle layer and discharged. An exhaust gas treatment apparatus characterized in that a plurality of diffuser-shaped guide vanes are provided below the gas dispersion plate in the wind box in parallel with the gas dispersion plate to form a plurality of diffuser parts. . 13. A particle layer composed of particles for trapping fine particles contained in exhaust gas, a gas dispersion plate below the particle layer, a wind box below the gas dispersion plate, and a shatterproof plate above the particle layer. Is provided in the main body of the apparatus, the exhaust gas is introduced from below the gas dispersion plate, the particle layer becomes a fluidized bed, and the fine particles in the exhaust gas are trapped so that the processing gas is passed over the particle layer and discharged. The exhaust gas treatment device, which has a particle size of 0.3
.About.0.5 mm particles 30-70 wt%, and particle size 0.5-1.
An exhaust gas treating apparatus characterized in that a particle layer is formed by mixing with 0 to 30% by weight of particles.