JP3339734B2 - Exhaust gas purification equipment - 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 purifying apparatus for removing particulate matter such as carbon particles such as carbon particles contained in exhaust gas from a diesel engine and removing NOx to denitrate.

[0002]

2. Description of the Related Art A typical prior art is disclosed in JP-A-55-72.
623. In this prior art, NOx is removed by guiding exhaust gas from a diesel engine to a dry-type denitration apparatus in which performance is not reduced by dust or SOx. Although there is a description that the catalyst of this dry denitration apparatus is configured in a parallel flow type such as a honeycomb-shaped plate, there is no disclosure of any specific configuration for preventing adverse effects due to dust contained in exhaust gas. Absent. If dust is attached to the catalyst and clogging occurs, the efficiency of denitration decreases due to a decrease in the catalytic function, and the pressure loss increases.

[0003] The applicant of the present invention discloses an apparatus for removing NOx by forming a centrifugal fluidized bed by accommodating a catalyst in a cylindrical dispersion plate having a horizontal axis in JP-A-4-322724 and JP-A-4-322725. Has been proposed. In order to increase the surface area of the catalyst, the catalyst is, for example, fine particles of several μm. In order to keep such a fine catalyst on the dispersion plate, the gas passage of the dispersion plate is formed smaller than the pore size of the catalyst. It must be.

[0004]

In the prior art for forming such a centrifugal fluidized bed, the dust contained in the dirty gas from the diesel engine adheres to the outer peripheral surface of the dispersion plate to cause clogging, and the denitration function is reduced. And the pressure loss increases.

An object of the present invention is to provide an exhaust gas purifying apparatus in which a dispersion plate forming a centrifugal fluidized bed of a denitration catalyst is not clogged by dust.

[0006]

SUMMARY OF THE INVENTION The present invention provides a dust removing means for removing dust from exhaust gas of an internal combustion engine, and a means provided downstream of the dust removing means for denitrifying exhaust gas using a catalyst. And a filling space between the housing to which the exhaust gas to be treated is supplied, an inner porous support plate provided inside and outside the radial direction, and a porous outer support plate. A first cylindrical container in which a particle-filled layer for removing particulate matter is formed, and a rotatably provided around a horizontal axis in the first container, and a particulate denitration catalyst partially disposed in a cylindrical dispersion plate. An exhaust gas purifying apparatus comprising: a second cylindrical container that is housed to form a centrifugal fluidized bed; and a unit that rotationally drives the second container around its axis.

The present invention also provides a dust removing means for removing dust from the exhaust gas of an internal combustion engine, a means for adjusting the temperature of the exhaust gas provided downstream of the dust removing means, and a downstream of the temperature adjusting means. And a means for denitrifying the exhaust gas using a catalyst. The medium dust removing means includes a housing to which the exhaust gas to be treated is supplied, and a porous support provided inside the housing and provided inside and outside in the radial direction. Plate, a first cylindrical container in which a particulate-filled particle-filled layer is formed in a filling space between the porous outer support plate, and a first container, which is provided rotatably around a horizontal axis in the first container, It comprises a second cylindrical container which partially accommodates a particulate denitration catalyst in a cylindrical dispersion plate to form a centrifugal fluidized bed, and means for rotating and driving the second container around its axis. It is an exhaust gas purification device.

The present invention also provides a supercharger having a turbine driven by exhaust gas from an internal combustion engine, a blower driven by the turbine to supply combustion air to the internal combustion engine, Means for denitrification using, a reducing agent supply source for supplying a reducing agent, and a bypass means for diverting a part of the air from the blower, diluting the reducing agent from the reducing agent supply source, and leading to the denitration means. At least upstream of the denitration means, dust removal means for removing the dust of the exhaust gas is arranged, the dust removal means is provided in the housing to which the exhaust gas to be treated is supplied, and is provided in the housing, radial direction A first cylindrical container in which a particle-filled layer for removing dust is formed in a space between the inner porous support plate and the outer porous support plate, and a horizontal axis in the first container; Provided rotatable around A second cylindrical container that partially accommodates the particulate denitration catalyst in the cylindrical dispersion plate to form a centrifugal fluidized bed; and a unit that rotationally drives the second container around its axis. It is an exhaust gas purifying device.

[0009]

Further, according to the present invention, the reducing agent supply source supplies a liquid reducing agent, and the liquid reducing agent from the reducing agent supply source is heated by the exhaust gas of the internal combustion engine to be vaporized, and the vaporized reducing agent is denitrated. A carburetor leading to the means is provided.

[0011]

[0012]

The first container of the present invention is provided so as to be rotatable about a horizontal axis, is provided with means for driving the first container to rotate about the axis, and is provided at a position close to the outside of the first container. Means for supplying a regeneration gas to the particulate-removed particle-packed layer.

Further, the filling space of the first container of the present invention is characterized in that a particulate denitration catalyst is also included.

Still further, the first container of the present invention comprises the inner perforated support plate and the outer perforated support plate, a partition plate arranged at intervals in the circumferential direction, and a pair of plates arranged at intervals in the axial direction. A plurality of each unit by the end plate,
The regeneration gas supply means supplies the regeneration gas to at least one unit of the particle packed bed. Further, the present invention also provides a housing to which exhaust gas to be treated is supplied, a porous internal support plate provided inside the housing and provided inside and outside in the radial direction, and a particulate removing particle in a filling space between the porous external support plate. A first cylindrical container on which a packed layer is formed;
In the first container, rotatably provided about a horizontal axis,
It comprises a second cylindrical container which partially accommodates a particulate denitration catalyst in a cylindrical dispersion plate to form a centrifugal fluidized bed, and means for rotating and driving the second container around its axis. It is a dust removing means.

[0016]

According to the present invention, the dust contained in the exhaust gas of the internal combustion engine is removed by the dust removing means and then guided to the subsequent denitration means. There is no adhesion of dust, which prevents a drop in catalytic function and does not increase pressure drop. Further, the exhaust gas to be treated from a diesel engine or the like is supplied into the housing, and the dust is removed by passing through the dust-removing particle-filled layer in the first container, and further provided in the first container. The NOx concentration is guided by the denitration catalyst of the second container. In order to increase the surface area of the denitration catalyst, the catalyst is made into fine particles. At this time, it is necessary to reduce the pore diameter of the cylindrical dispersion plate so that a centrifugal fluidized bed can be formed. Since the dust is removed in the dust-filled particle-filled layer of the container, it is possible to prevent the dispersion plate from being clogged by the dust.

[0017]

[0018]

Further, according to the present invention, the dust removing means is disposed on the upstream side of the temperature adjusting means, that is, the dust removing means is interposed between the internal combustion engine and the temperature adjusting means, or the dust removing means is disposed between the internal combustion engine and the temperature adjusting means. It may be provided between the denitration means.

Further, according to the present invention, a part of the air from the blower of the supercharger of the internal combustion engine is diverted to dilute the reducing agent such as ammonia or urea from the reducing agent supply source to denitrate. Therefore, there is no need to separately prepare a blower for supplying air for diluting the reducing agent through the bypass means, and the configuration is simplified. Since the reducing agent is stored in a tank or a pressure vessel and has a relatively high pressure of, for example, ² to 3 kg / cm ² ,
As described above, it is necessary to use a part of the air from the blower for dilution.

The flow rate of air from the blower of the supercharger used for dilution of the reducing agent is, for example, about 1 when the flow rate of air used for combustion of fuel in the internal combustion engine is 100. Only a very small amount, so that the air from the blower can be used only partially for diluting the reducing agent without adversely affecting the internal combustion engine.

Further, according to the present invention, when a liquid reducing agent is used, the liquid reducing agent is heated and vaporized by the exhaust gas of the internal combustion engine, and the thus obtained vaporized reducing agent is guided to the denitration means, whereby the liquid is reduced. In addition, there is no need to separately provide a configuration for heating the liquid reducing agent, and the configuration is simplified.

[0023]

Further, according to the present invention, the first container is provided rotatably about a horizontal axis, for example, about a horizontal axis, and a high-temperature gas is supplied by a regeneration gas supply means to burn the dust and remove the dust. The particle packed bed is regenerated and continuous operation is thus possible.

Further, according to the present invention, a particulate denitration catalyst is also included in the filling space of the first container, thereby removing particulates in the particulate-removing particle-packed layer and performing denitration.
Thus, the burden of denitration by the denitration catalyst forming the centrifugal fluidized bed can be reduced, and the overall configuration can be reduced in size.

Further, according to the present invention, in the first container, a plurality of units are arranged in a circumferential direction by an inner porous support plate, an outer porous support plate, a partition plate and a pair of end plates, Since the particle-packed layer is formed in each unit, the particle-packed layer of each unit can be reliably regenerated by the regeneration gas supply means.

[0027]

FIG. 1 is a system diagram showing the overall structure of an exhaust gas purifying apparatus 6 according to one embodiment of the present invention. Exhaust gas containing NOx and NOx from an internal combustion engine, for example, a diesel engine 1, is supplied from a pipe 3 to a dust removing means 6 to remove the particulate matter, and then from a pipe 105 to a NOx removing means 106.
To remove NOx, and then the exhaust gas passing through the pipe 5 drives the turbine 8 of the supercharger 7 and is guided from the pipe 9 to the chimney 12 via the exhaust gas economizer 11. Diesel engine 1 is, for example, a two-cycle marine diesel engine, and has a plurality of cylinders. Combustion air is supplied from a pipe 14 to a blower 13 rotationally driven by the turbine 8 of the supercharger 7, and the air from the blower 13 is guided from a pipe 15 to a cooler 16 to be cooled, From the road 17, it is guided to each cylinder of the diesel engine 1.

FIG. 2 is a system diagram showing the structure of the denitration means 106. Exhaust gas to be denitrated is supplied to the inlet 110 of the denitration reactor 109 from the above-mentioned pipe 105, and the purified exhaust gas is guided from the pipe 5 as described above. A nozzle 111 is provided in the denitration reactor 109, and the nozzle 111 is supplied with a diluted reducing agent from a pipe 112. From the pipe line 113, a blower 11 provided separately is provided.
4 from the reducing agent supply source 108 to a mixer 107 provided in the middle of the pipe line 113.
A high pressure reducing agent of 3 kg / cm ² is pumped. Thus, the reducing agent is diluted by the air from the blower 114 and injected into the denitration reactor 109 from the nozzle 111.

A catalyst 115 is provided in the denitration reactor 109. The catalyst is, for example, TiO ₂ -V ₂ O ₅ -WO ₃
System, or TiO ₂ -V ₂ O ₅ system, Cu
O-Al ₂ O ₃ may be used. The reducing agent may be, for example, NH ₃ or urea.

The dust removing means 6 is provided upstream of the denitration means 106.
Is provided, it is possible to prevent the catalyst 115 of the denitration means 106 from being clogged by dust, prevent the catalyst function from being lowered as described above, and prevent the pressure loss from increasing.

FIG. 3 is an overall system diagram showing the configuration of another embodiment of the present invention. This embodiment is similar to the previous embodiment, and corresponding parts are denoted by the same reference numerals. In this embodiment, the supercharger 7 is arranged on the downstream side of the dust removing unit 6, and the denitration unit 106 is further arranged on the downstream side. By providing the dust removing means 6, the catalyst 1 of the denitration means 106
15 is prevented from adhering to the dust. 1 and 3
In each of the embodiments, since the dust removing means 6 is provided on the upstream side of the supercharger 7, it is needless to say that the dust does not adhere to the turbine 8 of the supercharger 7.

In the supercharger 7, a bypass line 11 is provided between a line 105 on the inlet side of the turbine 8 and a line 9 on the outlet side.
The flow path control valve 117 is interposed in the bypass line 116. By adjusting the opening of the flow control valve 117, the temperature of the exhaust gas supplied to the denitration means 106 via the pipe 9 can be adjusted, and the turbine 8
Prevents the temperature of the exhaust gas to the denitration means 106 from becoming too low.

Another embodiment is shown in FIG. The embodiment shown in FIG. 4 is similar to the previous embodiment, but it should be noted that the supercharger 7 is arranged upstream of the dust removing means 6. Exhaust gas from the diesel engine 1 is directly guided to the turbine 8 of the supercharger 7, and thus dust may adhere to the turbine 8, but the performance of the turbine 8 and therefore the supercharger 7 may not be reduced. Rarely occurs. From the turbine 8 and from the bypass 11
The exhaust gas from 6 through the flow control valve 117 is guided to the dust removing means 6. Other configurations are the same as those of the above-described embodiment.

FIG. 5 is a system diagram showing the overall configuration of still another embodiment of the present invention. This embodiment is similar to the previous embodiment, and corresponding parts are denoted by the same reference numerals. It should be noted that in this embodiment, the dust removing means 6 and the denitration means 10
6. Temperature adjusting means 118 for adjusting the temperature of the exhaust gas between
Is interposed. The temperature adjusting means 118 includes a cooler 119 for cooling the exhaust gas supplied from the dust removing means 6 via the conduit 105, and a heater 120 arranged in cascade with the cooler 119. Bypass path 121,
122 is provided, and the three-way valves 123 and 124 are connected. The three-way valves 123 and 124 include a cooler 119 / heater 1
20 and the flow rate of the exhaust gas in the bypass passage 121 / bypass passage 122 can be controlled, and can also be opened and closed. The cooler 119 may have a configuration for indirect heat exchange between a refrigerant such as seawater and exhaust gas via a heat transfer wall such as a heat transfer plate. The heater 120 may be configured to heat the exhaust gas by an electric heater.

When the temperature of the exhaust gas from the diesel engine 1 is too high due to the catalyst of the denitration means 106, the exhaust gas is cooled using the cooler 119. At this time, the exhaust gas guided from the dust removing means 6 to the pipe 105 is supplied to the denitration means 106 through the three-way valve 123, the cooler 119, the three-way valve 124, and the bypass 122. At this time, a part of the exhaust gas may be diverted to the bypass path 121 due to the temperature adjustment.

The temperature of the exhaust gas from the diesel engine 1 is
When the temperature is too low for the catalyst 115 of the denitration means 106, the exhaust gas from the dust removal means 6 is heated from the pipe 106 through the three-way valve 123, the bypass path 121, and the three-way valve 124 by the heater 120. Supplied to Therefore, the catalyst 115 of the denitration means 106 is kept at a temperature of, for example, about 300 ° C. to about 500 ° C., thereby preventing adhesion of acidic ammonium sulfate, and further progress of sintering of the catalyst component and occurrence of phase transition of crystals. Is prevented.

Further, when the exhaust gas from the diesel engine 1 is at an appropriate temperature in the denitration catalyst 115, the exhaust gas passes through the pipe 105, the three-way valve 123,
Bypass passage 121, three-way valve 124 and bypass passage 12
After passing through line 2, it is guided from line 126 to denitration means 106.

As another embodiment of the present invention, the dust removing means 6 of FIG. 5 may be interposed between the diesel engine 1 and the three-way valve 123, instead of being interposed between the diesel engine 1 and the three-way valve 123. Good.

FIG. 6 is a system diagram showing the overall configuration of another embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 5, but noteworthy is the cooler 119 in FIG.
, A turbocharger 7 including a turbine 8 and a blower 13 is used.
A bypass passage 116 connected between the inlet and the outlet is used, and a flow control valve 117 is used instead of the three-way valve 123. The flow control valve 117 has an opening / closing function. The exhaust gas is expanded by the turbine 8 to lower the temperature, thereby achieving the function of cooling the exhaust gas. For temperature adjustment, the opening of the flow control valve 117 is adjusted.

FIG. 7 is a system diagram showing the overall configuration of another embodiment of the present invention. The embodiment shown in FIG. 7 is similar to the embodiment shown in FIG. 1 described above, and corresponding portions are denoted by the same reference numerals. It should be noted that in this embodiment, part of the combustion air for the diesel engine 1 supplied from the blower 13 of the supercharger 7 to the pipe 15 is bypassed by the bypass 129.
And the mixture is led to a mixer 107 of a denitration means 106 and used for diluting the reducing agent from a reducing agent supply source 108. A flow control valve 130 is interposed in the bypass 129. The ratio of the flow rate of the air used in the mixer 107 to the flow rate of the combustion air supplied to the cooler 16 is, for example, 1: 100, and the flow rate of the air supplied to the bypass 129 is It is negligible compared to the flow rate of the supplied combustion air. Therefore, even if such a bypass 129 is provided and air from the blower 13 is used for diluting the reducing agent, the diesel engine 1 is not adversely affected.

FIG. 8 is a system diagram showing the overall configuration of still another embodiment of the present invention. Although this embodiment is similar to the embodiment of FIG. 7 described above, it should be noted that in this embodiment, a vaporizer 133 is provided in a pipe 9 on the downstream side of the supercharger 7, and the vaporizer 133 has , A part of the exhaust gas is led from the pipe 9 via the pipe 134. A flow control valve 135 is interposed in the pipe 134. A liquid reducing agent supply source 131 is connected to the vaporizer 133. This liquid reducing agent supply source 131
For example, urea water or ammonia water or the like is pressure-fed, and is vaporized by heat from a heat transfer tube 136 into which exhaust gas supplied through a pipe 134 is introduced by a vaporizer 133, and is vaporized into a pipe 137. A reducing agent is led. The reducing agent is supplied from the line 128 of the denitration means 106 to the mixer 1
07 and the mixer 1 as in the embodiment of FIG.
At 07, the air is diluted by the air through the bypass 129 and the flow control valve 130. Other configurations are the same as those of the above-described embodiment.

FIG. 9 is a block diagram showing the overall configuration of still another embodiment of the present invention. Although the embodiment shown in FIG. 9 is similar to the embodiment shown in FIG. 8 described above, it should be noted that in this embodiment, the line 134 for supplying the exhaust gas to the heat transfer tube 136 of the vaporizer 133 includes: A part of the exhaust gas flowing in the pipeline 5 on the upstream side of the turbine 8 of the supercharger 7 is divided and guided.

FIG. 10 is a longitudinal sectional view showing the entire structure of the dust removing means 6 according to one embodiment of the present invention. In the dust removing means 6, the exhaust gas to be treated including the dust and NOx is generated from, for example, a diesel engine and supplied to the housing 25 from the inlet 26. This housing 25 may also serve as an exhaust manifold. In the housing 25, the first straight cylindrical container 3 on which the particulate-removed particle-filled layer 39 is formed.
0, and a second straight cylindrical container 31 provided coaxially in the first container 30. The second container 31 is driven to rotate about the horizontal axis 20 by the driving cylinder 21, A centrifugal fluidized bed of the particulate denitration catalyst 22 is formed. Exhaust gas to be treated from the inlet 26 is removed in the particulate removal layer 39 for particulate removal in the first container 30 and proceeds radially inward, and is further denitrated by the particulate denitration catalyst 22 in the second container 31. The gas thus purified is discharged through a straight cylindrical passage 5. The drive tube 21 and the base end of the pipe 5 are fixed to the end plates 67 and 68 of the second container 31, and are rotatably provided on the end plates 37 and 38 of the first container 30 by bearings 69 and 70. Can be

The base ends of straight cylindrical support cylinders 73 and 74 are fixed to the end plates 37 and 38 of the first container 30, and these support cylinders 73 and 74 are attached to the housing 25 by bearings 75 and 76. It is rotatably supported. The rotational power from the motor 23 is transmitted to the drive cylinder 21 and the support cylinder 73 via the transmission 24, and is rotated at a high speed so that a centrifugal fluidized bed of the particulate denitration catalyst 22 is formed. Cylinder 7
3, and thus the first container 30 is driven for regeneration at a low speed, for example one revolution every few hours.

The dust removing means 6 shown in FIG. 10 is used in connection with the two-stroke marine diesel engine 1 shown in FIG. Exhaust gas from each of the plurality of cylinders 2 of the diesel engine 1 is supplied from the pipe 3 to the dust removing means 6, and exhaust gas from the dust removing means 6 is discharged through the pipe 5. The exhaust gas from the dust removing means 6 via the pipe 5 drives the turbine 8 of the supercharger 7 and is guided from the pipe 9 to the chimney 12 via the exhaust gas economizer 11. Turbocharger 7
Combustion air is supplied from a pipe 14 to a blower 13 that is rotationally driven by a turbine 8 of the above. The air from the blower 13 is guided from a pipe 15 to a cooler 16 and cooled.
The gas is guided from a pipe 17 to each cylinder of the diesel engine 1 through a scavenging pipe 18.

FIG. 12 is an enlarged sectional view of a part of the first container 30 in FIG. 10, and FIG.
FIG. 14 is a partial cross-sectional view as viewed from a cutting plane perpendicular to FIG.
Is a cross-sectional view of the first container 30 viewed from a cut surface passing through the axis 20. Referring to these drawings, the first container 30
Has a number of units 32 that are spaced apart in the circumferential direction. Each unit 32 includes a perforated inner support plate 33 and a perforated outer support plate 34 provided inside and outside in the radial direction,
Partition plates 35 and 36 arranged at intervals in the circumferential direction;
A pair of end plates 37, 3 arranged at intervals in the axial direction
And 8. This unit 32 is made of metal. In each unit 32, a particle-filled layer 39 for removing dust particles filled with a particulate filter material is formed. The granular filter material forming the particle-filled layer 39 is, for example, a thermally-stable ceramic granule such as alumina, mullite, and silica, and may have an outer diameter of 1 to 5 mmφ.
Further, catalyst particles such as Pt, Pd, MnO, NiO, etc. which are effective in promoting dust combustion may be mixed. Further, a material similar to the above-mentioned catalyst particles may be applied to the ceramic granulated material.

Thus, the first container 30 is formed in a cylindrical shape as a whole. The inner and outer support plates 33 and 34 are realized by, for example, a punched metal, a wire mesh, or the like.
Other units 32a, 3 adjacent to one unit 32
Corresponding portions of 2b are denoted by the same numerals with the suffixes a and b added thereto, and these suffixes a and b may be omitted in general. In the unit 32, cooling chambers 41 and 42 are respectively formed on both sides in the circumferential direction by intermediate partition plates 59 and 60, and the units 32 and 32a adjacent in the circumferential direction are separated from each other via the cooling chambers 41 and 41a. The units 32 and 32b are provided with cooling chambers 42 and 42b.
Are separated through. The radially inner ends of the cooling chambers 41 and 42 are closed by sealing plates 43 and 44, and the radially outer ends are closed by sealing plates 45 and 46. Vent holes 47 and 48 are formed in the sealing plates 45 and 46. The radially inward ends of the cooling chambers 41 and 42 are 1
Alternatively, they are communicated by a plurality of (two in this embodiment) pipelines 49.

FIG. 15 is an enlarged sectional view showing the vicinity of the radially inner end of the cooling chamber 41. The pipe 49 is air-tightly connected to the partition plate 35 and communicates with the cooling chamber 41. The same applies to the other cooling chamber 42.

Referring again to FIG. 10, a regeneration gas supply means 51 is arranged at a position above the housing 25 of the dust removing means 6. The casing 77 of the regeneration gas supply means 51 is connected to the casing 77 via a pipe 52 shown in FIG.
A portion of the high-temperature air at 100 to 150 ° C. is branched and supplied from the blower 13 via a pipe 15. This conduit 52
Is heated by, for example, a heater 53 such as an electric heater, and is opened to one or more (in this embodiment, one) the particle-filled layers 39 of the unit 32. Supply air with temperature,
The medium in the exhaust gas adhering to or adsorbed to the filter material filled in the particle filling layer 39 is burned to regenerate the filter material. At this time, the temperature of the unit 32 is, for example, 1000
Since the temperature is higher than ℃, to improve heat resistance,
A nozzle 55 for supplying air as a cooling gas from the ventilation hole 47 to one of the cooling chambers 41 is attached to the exhaust manifold 4. The air supplied to the cooling chamber 41 is
The gas flows into the other cooling chamber 42 through 9 and is discharged from the pipe 56 attached to the exhaust manifold 4 through the vent hole 48. An air cooler 16 shown in FIG.
, And cooled air is supplied via a pipe 17.

Referring again to FIG. 12, the partition plate 36 is provided at an angle θ 1 with respect to the radial line 57 of the container 19. Therefore, although a space 58 is formed above the particle packed layer 39 of each unit 32, a short path of the exhaust gas from the outer support plate 34 to the inner support plate 33 is prevented, and the exhaust gas is reliably transferred to the particle packed layer 39. Therefore, the trapping of the particulate matter in the exhaust gas is ensured, the bias of the filtering material in the particulate packed layer 39 is prevented as much as possible, and the regeneration of the particulate packed layer by incineration of the particulate dust as described above. It is easily possible.

Next, the configuration of the second container 31 will be described. A straight cylindrical dispersion plate 78 provided coaxially with the axis 20 is formed of a metal plate such as a punched metal having a large number of air holes. The powdery denitration catalyst 22 is attached to the dispersion plate 78 by centrifugal force. To support. A cylindrical filter member 7 extends radially inward and between the end plates 67 and 68.
9 is attached. This filter member 79 prevents the particulate denitration catalyst 22 from being discharged to the pipe 5 together with the gas.
The particle size of the particulate denitration catalyst is, for example, on the order of μm, thereby increasing the surface area and improving the reactivity. Examples of the granular denitration catalyst 22 include V ₂ O ₅ —TiO ₂ , V ₂
O ₅ —WO ₃ —TiO ₂ , CuO—Al ₂ O ₃ are mixed with inert particles, and NH ₃ as a reducing agent is added to the gas to be treated in a necessary reaction equivalent amount to supply the gas to be treated. By removing the dust in the first container 30 in this manner,
The dust is prevented from blocking the passage holes, which are a large number of pores, of the dispersion plate 78 to cause clogging. As a denitration catalyst, V ₂ O ₅ , WO ₃ and Cu can be used on the surface of ceramic granules such as thermally stable alumina, bright and silica.
It may have a configuration supporting O or the like, and may have another configuration.

FIG. 16 is a partial sectional view of another embodiment of the present invention. In this embodiment, a porous partition plate 81 coaxial with the axis 20 is provided between the inner porous support plate 33 and the outer porous support plate 34 of the first container 30. Perforated outer support plate 34
And the space between the porous partition plate 81 and the porous partition plate 81 are provided with the above-mentioned particle filling layer 39 for removing dust. A granular denitration catalyst 82 is filled between the perforated partition plate 81 and the perforated support plate 33. The exhaust gas from which the dust has been removed by the dust-removing particle-packed layer 39 by this means is converted into NOx by the packed bed of the particulate denitration catalyst 82.
Is auxiliary removed, and then the denitration in the second container 31 is further reliably performed. Such a particulate denitration catalyst 82
Is formed in the first container 30, the burden on the particulate denitration catalyst 22 in the second container 31 is reduced, and the overall configuration can be reduced in size.

FIG. 17 is a diagram showing the structure of the transmission 24 in a simplified manner. The power of the motor 23 is transmitted to the sprocket wheel 83, and the sprocket wheel 83
Is fixed to the corresponding gear 84 constituting the planetary gear device,
The corresponding gear 84 is fixed to the driving cylinder 21. A plurality of planet gears 85 mesh with the corresponding gear 84, and the planet gears 8
5 meshes with an internal gear 86. The support cylinder 73 is fixed to the ring gear 86. In this manner, the driving cylinder 21 is driven to rotate at a high speed, and the driving cylinder 21 is driven to rotate at a low speed. The transmission 24 may be realized by other configurations.

[0054]

As described above, according to the present invention, after the dust contained in the exhaust gas from an internal combustion engine such as a diesel engine is removed by the dust removing means, the dust is guided to the denitration means using a catalyst. As a result, the catalyst is not clogged by dust or the like, thereby preventing the catalyst function from lowering. Therefore, the denitration efficiency does not decrease and the pressure loss does not increase. In the exhaust gas to be treated supplied into the housing, the dust is removed by the dust-removing particle-packed layer in the filling space formed in the first cylindrical container, and then, the dust is rotated about a horizontal axis. In the driven second cylindrical container, the exhaust gas is denitrated by the particulate denitration catalyst forming the centrifugal fluidized bed held by the cylindrical dispersion plate, and the exhaust gas is purified. Since the gas after the removal is supplied, the dispersion plate is not clogged, and even if the particle size is small in order to increase the surface area of the denitration catalyst, it can be held by the dispersion plate.

[0055]

Further, according to the present invention, the dust removing means is provided upstream of the temperature adjusting means, thereby causing a problem that the medium dust enters and adheres to the temperature adjusting means to lower the heat exchange efficiency. Can be prevented.

Further, according to the present invention, a part of the air from the blower of the supercharger of the internal combustion engine is diverted and used for diluting the reducing agent from the reducing agent supply source. There is no need to provide a new blower for dilution of
The configuration can be simplified. Moreover, the air from the blower used for such dilution is smaller than the flow rate of the air supplied from the blower as combustion air for the internal combustion engine.
It is sufficient if the value is sufficiently small, so that it does not adversely affect the internal combustion engine.

Further, according to the present invention, when the reducing agent is a liquid, a vaporizer for heating and vaporizing the liquid reducing agent by the exhaust gas of the internal combustion engine is provided.

[0059]

Further, according to the present invention, the first container can also be rotated around the horizontal axis to supply a regeneration gas to the particle-removing particle-packed layer and burn the dust to perform regeneration. And continuous operation for a long time becomes possible.

Further, according to the present invention, the filling space of the first container includes not only the particles for removing dust but also a particulate denitration catalyst, so that the burden of denitration by the denitration catalyst in the second container can be reduced. , To reduce the size of the configuration.

[Brief description of the drawings]

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

FIG. 2 is a partial system diagram showing a specific configuration of the dust removing means 6.

FIG. 3 is a system diagram showing the overall configuration of another embodiment of the present invention.

FIG. 4 is a system diagram showing the overall configuration of another embodiment of the present invention.

FIG. 5 is a system diagram showing the entire configuration of another embodiment of the present invention.

FIG. 6 is a system diagram showing the overall configuration of another embodiment of the present invention.

FIG. 7 is a system diagram showing the overall configuration of another embodiment of the present invention.

FIG. 8 is a system diagram showing the overall configuration of another embodiment of the present invention.

FIG. 9 is a system diagram showing the overall configuration of another embodiment of the present invention.

FIG. 10 is a longitudinal sectional view showing the overall configuration of one embodiment of the present invention.

FIG. 11 is a system diagram showing a diesel engine 1 and an overall configuration related thereto.

FIG. 12 is a cross-sectional view of a part of the first container 30 perpendicular to the axis.

FIG. 13 is a cross-sectional view of the vicinity of the regeneration gas supply means 51 as viewed from a section perpendicular to the axis 20 of a part of the first container 30. FIG. 2 is an enlarged cross-sectional view of a part of the container 19 in FIG. 1.

FIG. 14 is a cross-sectional view of the first container 30 as viewed from a cutting plane parallel to the axis 20.

FIG. 15 is an enlarged sectional view of a part near the cooling chamber 41.

FIG. 16 is a cross-sectional view perpendicular to the axis showing a part of a first container 30 according to another embodiment of the present invention.

FIG. 17 is a diagram schematically illustrating an embodiment of a transmission 24.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diesel engine 6 Exhaust gas purifier 7 Supercharger 8 Turbine 13 Blower 15, 36 Partition plate 16 Air cooler 18 Scavenging pipe 20 Axis 22, 82 Granular denitration catalyst 23 Motor 24 Transmission 25 Housing 30 First straight cylindrical container 31 Second Right cylindrical container 32 Unit 33 Inner perforated support plate 34 Outer perforated support plate 37, 38, 67, 68 End plate 39 Particle removal layer for dust removal 51 Regeneration gas supply means 81 Porous partition plate 82 Granular denitration catalyst

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-322724 (JP, A) JP-A-4-87332 (JP, U) JP-A-4-54927 (JP, U) JP-A-63- 149222 (JP, U) Japanese Utility Model 63-143143 (JP, U) JP-B 47-23245 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01N 3/08-3 / 36 F01N 3/02

Claims (8)

(57) [Claims] 1. A dust removing means for removing dust from exhaust gas of an internal combustion engine, and means provided downstream of the dust removing means for denitrifying exhaust gas using a catalyst. The means includes: a housing to which the exhaust gas to be treated is supplied; a porous inner support plate provided in the housing and provided inside and outside in the radial direction; A first cylindrical container in which is formed, provided in the first container so as to be rotatable around a horizontal axis,
It comprises a second cylindrical container for forming a centrifugal fluidized bed by partially accommodating a granular denitration catalyst in a cylindrical dispersion plate, and means for rotating and driving the second container around its axis. Exhaust gas purification device. 2. A dust removing means for removing dust from exhaust gas of an internal combustion engine; a means provided downstream of the dust removing means for adjusting the temperature of the exhaust gas; and a means downstream of the temperature adjusting means. Means for denitrifying the exhaust gas using a catalyst, the medium dust removing means, a housing to which the exhaust gas to be treated is supplied, an inner porous support plate provided in the housing and provided inward and outward in the radial direction, A first cylindrical container in which a particle-filled layer for removing dust is formed in a filling space between the porous outer support plate, and a first container provided rotatably around a horizontal axis in the first container;
It comprises a second cylindrical container for forming a centrifugal fluidized bed by partially accommodating a granular denitration catalyst in a cylindrical dispersion plate, and means for rotating and driving the second container around its axis. Exhaust gas purification device. 3. A supercharger having a turbine driven by exhaust gas of an internal combustion engine, a blower driven by the turbine to supply combustion air to the internal combustion engine, and using the exhaust gas by using a catalyst and a reducing agent. A denitrification means, a reducing agent supply source for supplying a reducing agent, and a bypass means for diverting a part of the air from the blower to dilute the reducing agent from the reducing agent supply source and leading it to the denitration means, At least upstream of the denitration means, dust removing means for removing dust in the exhaust gas is disposed, and the dust removing means is provided in the housing to which the exhaust gas to be treated is supplied, and inside and outside the radial direction, respectively. A first cylindrical container in which a particle-filled layer for removing dust is formed in a space between the inner porous support plate and the outer porous support plate, wherein the first cylindrical container rotates around a horizontal axis in the first container; Provided as possible,
It comprises a second cylindrical container for forming a centrifugal fluidized bed by partially accommodating a granular denitration catalyst in a cylindrical dispersion plate, and means for rotating and driving the second container around its axis. Exhaust gas purification device. 4. A reducing agent supply source supplies a liquid reducing agent, and heats and vaporizes the liquid reducing agent from the reducing agent supply source by exhaust gas from an internal combustion engine, and guides the vaporized reducing agent to a denitration unit. The exhaust gas purifying apparatus according to claim 3, further comprising a vaporizer. 5. The first container is provided so as to be rotatable about a horizontal axis, means for driving the first container to rotate about the axis, and provided at a position close to the outside of the first container. The exhaust gas purifying apparatus according to any one of claims 1 to 4, further comprising means for supplying a regeneration gas to the removal particle-packed layer. 6. The exhaust gas purifying apparatus according to claim 1, wherein the filling space of the first container includes a particulate denitration catalyst. 7. A first container, wherein: the inner perforated support plate and the outer perforated support plate; a partition plate disposed at intervals in a circumferential direction; and a pair of end plates disposed at intervals in an axial direction. 5. The method according to claim 1, wherein each of the plurality of units comprises a plurality of units, and the regeneration gas supply unit supplies the regeneration gas to the particle packed bed of at least one unit. Exhaust gas purification device. 8. A housing to which the exhaust gas to be treated is supplied, a porous support plate provided in the housing and provided inside and outside in the radial direction, and particles for removing particulate matter in a filling space between the porous support plate. A first cylindrical container in which a packed layer is formed, and provided in the first container so as to be rotatable about a horizontal axis,
It comprises a second cylindrical container for forming a centrifugal fluidized bed by partially accommodating a granular denitration catalyst in a cylindrical dispersion plate, and means for rotating and driving the second container around its axis. Dust removal device.