JPH07119445A - Exhaust gas purification device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the catalyst in denitration means using a catalyst from being clogged by dust particles contained in exhaust gas. [Structure] Exhaust gas from a diesel engine is guided to a dust removing means to remove dust from the exhaust gas, and then to denitration means using a catalyst. As a result, it is possible to prevent the catalyst from being clogged in the denitration means, and thus to prevent an increase in pressure loss and a reduction in denitration efficiency due to a reduction in the catalytic function.

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 NOx by removing dust such as carbon particles and other carbides contained in exhaust gas of a diesel engine and for removing NOx.

[0002]

2. Description of the Related Art A typical prior art is JP-A-55-72.
623. In this prior art, exhaust gas from a diesel engine is guided to a dry denitration device that does not deteriorate in performance due to dust or SOx to remove NOx. Although there is a description that the catalyst of this dry denitration device is configured in a parallel flow type such as a honeycomb plate shape, nothing is disclosed about a specific configuration for preventing adverse effects due to dust particles contained in exhaust gas. Absent. When dust particles adhere to the catalyst to cause clogging, the denitration efficiency decreases due to the deterioration of the catalytic function, and the pressure loss increases.

The applicant of the present application discloses, in JP-A-4-322724 and JP-A-4-322725, an apparatus for accommodating a catalyst in a cylindrical dispersion plate having a horizontal axis to form a centrifugal fluidized bed for removing NOx. Is proposed. In order to increase the surface area of the catalyst, the catalyst is made into fine particles of, for example, several μm, and in order to hold such fine catalyst on the dispersion plate, the gas passage of the dispersion plate is formed smaller than the pore diameter of the catalyst. It must be.

[0004]

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

An object of the present invention is to provide an exhaust gas purifying apparatus in which the dispersion plate forming the centrifugal fluidized bed of the denitration catalyst is prevented from being clogged with dust.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a means for removing dust particles from exhaust gas of an internal combustion engine, and means for denitrifying the exhaust gas by using a catalyst, which is provided downstream of the dust particle removing means. It is an exhaust gas purifying device characterized by including and.

Further, the present invention is an exhaust gas purifying apparatus characterized by including means for adjusting the temperature of exhaust gas of an internal combustion engine, and means for denitrifying the exhaust gas using a catalyst, provided downstream of the temperature adjusting means. Is.

Further, the present invention provides a dust removing means for removing dust from the exhaust gas of the internal combustion engine, a means provided downstream of the dust removing means for adjusting the temperature of the exhaust gas, and a temperature adjusting means downstream. An exhaust gas purifying apparatus is provided, which comprises means for denitrifying the exhaust gas using a catalyst.

Further, the present invention is directed to a turbine driven by exhaust gas of an internal combustion engine, a supercharger having a blower driven by the turbine to supply combustion air to the internal combustion engine, an exhaust gas, a catalyst and a reducing agent. Means for denitrifying 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 to dilute the reducing agent from the reducing agent supply source and guiding it to the denitration means. It is an exhaust gas purifying apparatus characterized by including.

In the present invention, the reducing agent supply source supplies a liquid reducing agent, 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. It is characterized in that a vaporizer leading to the means is provided.

Further, the present invention is characterized in that a dust removing means for removing dust of exhaust gas is arranged at least upstream of the denitration means.

Further, the dust removing means of the present invention is provided between a housing to which the exhaust gas to be treated is supplied, a porous inner support plate provided inside the housing, and a porous inner support plate provided inside and outside the radial direction, respectively. A first cylindrical container having a particle-filled bed for removing dust particles in a filling space thereof, and a granular denitration catalyst provided in the cylindrical container so as to be rotatable about a horizontal axis in the first container. It is characterized by including a second cylindrical container which is partially housed to form a centrifugal fluidized bed, and means for rotationally driving the second container around its axis.

The first container of the present invention is rotatably provided around a horizontal axis, and is provided at a position close to the outside of the first container and a means for driving the first container to rotate about the axis. A means for supplying a regenerating gas to the particle-filled bed for removing dust particles is included.

Furthermore, the filling space of the first container of the present invention is characterized in that it also contains a granular denitration catalyst.

Furthermore, the first container of the present invention comprises a pair of inner and outer porous support plates, partition plates arranged at intervals in the circumferential direction, and a pair arranged at intervals in the axial direction. With the end plate of, each of a plurality of units is configured,
The regeneration gas supply means is characterized in that the regeneration gas is supplied to the particle packed bed of at least one unit.

[0016]

According to the present invention, since the particulate matter contained in the exhaust gas of the internal combustion engine is removed by the particulate matter removing means, the particulate matter is guided to the denitration means which follows it. No dust adheres, which prevents the catalytic function from deteriorating and does not increase the pressure loss.

Further, according to the present invention, after the temperature of the exhaust gas of the internal combustion engine such as a diesel engine is adjusted by the temperature adjusting means, the exhaust gas is guided to the denitration device that follows it. Optimal temperature,
For example, it becomes possible to keep at 300 to 500 ° C. If the temperature of the exhaust gas supplied to the catalyst becomes less than about 300 ° C., the sulfuric acid produced from the sulfur content in the fuel, for example, by the combustion of heavy fuel oil C used as a marine fuel used in the internal combustion engine, is used as the reducing agent. Reacts with to precipitate acidic ammonium sulfate, and the acidic ammonium sulfate adheres to the catalyst to deteriorate the catalytic performance.

On the contrary, if the temperature of the exhaust gas supplied to the denitration means is too high, for example, higher than about 500 ° C., sintering of the catalyst component will proceed and phase transition of crystals will occur. As a catalyst, for example, TiO ₂ —V ₂ O ₅ —W
When the O ₃ system is used, the inlet temperature of exhaust gas is preferably about 370 ° C., for example.

Further according to the invention, the dust removing means is arranged upstream of the temperature adjusting means, that is, the dust removing means is interposed between the internal combustion engine and the temperature adjusting means, or alternatively, the temperature adjusting means is provided. 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. It is not necessary to separately prepare a blower for introducing air to the reducing agent through the bypass means, and thus supplying air for diluting the reducing agent, and the configuration is simplified. 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 mentioned above, it is necessary to use some of the air from the blower to dilute.

The flow rate of air from the blower of the supercharger used for diluting the reducing agent is about 1 when the flow rate of air used for combustion of fuel in the internal combustion engine is 100. It is of a modest and very low level, so that even if the air from the blower is used in a partial shunt to dilute the reducing agent, it does not adversely affect the internal combustion engine.

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

Further, according to the invention, the exhaust gas to be treated from a diesel engine or the like is supplied into the housing,
The dust particles are removed by passing through the particle-filled bed for removing dust particles in the container, and are further guided to the denitration catalyst of the second container provided in the first container to reduce the NOx concentration. In order to increase the surface area of the denitration catalyst, the catalyst is made into fine particles, and at this time, it is necessary to make the pore diameter of the cylindrical dispersion plate small so that a centrifugal fluidized bed can be formed. Since the dust particles are removed from the particle-filled layer for removing dust particles of the container, it is possible to prevent the dispersion plate from being clogged with the dust particles.

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

Furthermore, according to the present invention, the filling space of the first container also includes a particulate denitration catalyst, whereby the particulate dust removal layer is used to remove dust and denitration.
In this way, the burden of denitration by the denitration catalyst forming the centrifugal fluidized bed can be reduced, and thus the overall configuration can be downsized.

Further in accordance with the present invention, in the first container, a plurality of units are arranged in the circumferential direction by the inner porous support plate, the outer porous support plate, the partition plate and the pair of end plates. Since the particle packed bed is formed in each unit, the particle packed bed of each unit can be surely regenerated by the regenerating gas supply means.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram showing the overall construction of an exhaust gas purifying apparatus 6 according to an embodiment of the present invention. Exhaust gas to be treated containing dust 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 dust, and thereafter, a denitration means 106 from a pipe 105.
The exhaust gas passing through the pipe 5 drives the turbine 8 of the supercharger 7 and is led from the pipe 9 to the chimney 12 via the exhaust gas economizer 11. The 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 line 14 to a blower 13 which is rotationally driven by a turbine 8 of the supercharger 7. The air from the blower 13 is guided from a pipe line 15 to a cooler 16 to be cooled, From the road 17 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 diluted reducing agent from the pipe 112 is supplied to the nozzle 111. Blower 11 provided separately from pipe line 113
4 is pressure-fed, and, for example, from the reducing agent supply source 108 to the mixer 107 provided in the middle of the pipe line 113.
A reducing agent having a high pressure of 3 kg / cm ² is pumped. In this way, the reducing agent is diluted with the air from the blower 114 and injected from the nozzle 111 into the denitration reactor 109.

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
It may be O-Al ₂ O ₃ or the like. The reducing agent may be, for example, NH ₃ or urea.

On the upstream side of the denitration means 106, the dust removing means 6
Since the catalyst is provided, the catalyst 115 of the denitration means 106 can be prevented from being clogged by the dust, the deterioration of the catalytic function can be prevented as described above, and the pressure loss will not increase.

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 bear the same reference numerals. In this embodiment, the supercharger 7 is arranged downstream of the dust removing means 6 and the denitration means 106 is arranged further downstream thereof. By providing the dust removing means 6, the catalyst 1 of the denitration means 106
It is possible to prevent dust particles from adhering to 15. 1 and 3
In each embodiment, since the dust removing means 6 is provided on the upstream side of the supercharger 7, it goes without saying that the dust does not adhere to the turbine 8 of the supercharger 7.

A bypass pipe 11 is provided between the pipe 105 on the inlet side and the pipe 9 on the outlet side of the turbine 8 in the supercharger 7.
6 is provided, and a flow rate control valve 117 is interposed in the bypass line 116. By adjusting the opening of the flow rate 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
This prevents the temperature of the exhaust gas to the denitration means 106 from becoming too low.

Yet another prior art is shown in FIG. The embodiment shown in FIG. 4 is similar to the embodiment described above, but it should be noted that the supercharger 7 is arranged upstream of the dust removing means 6. The exhaust gas from the diesel engine 1
Although the dust may be directly guided to the turbine 8 of the supercharger 7 and thus dust may be attached to the turbine 8, the performance of the turbine 8 and thus the supercharger 7 is hardly deteriorated. From turbine 8 and by-pass 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 in the above-mentioned embodiment.

FIG. 5 is a system diagram showing the overall construction of still another embodiment of the present invention. This embodiment is similar to the previous embodiment, and corresponding parts bear the same reference numerals. It should be noted that in this embodiment, the dust removing means 6 and the denitration means 10 are used.
Temperature adjusting means 118 for adjusting the temperature of the exhaust gas between
Is intervened. The temperature adjusting means 118 includes a cooler 119 for cooling the exhaust gas supplied from the dust removing means 6 via the pipe line 105, and a heater 120 arranged in cascade with the cooler 119, and Bypass 121,
122 is provided, and the three-way valves 123 and 124 are connected. The three-way valves 123 and 124 are provided in the cooler 119 / heater 1
It is possible to control the flow rate of exhaust gas in the bypass passage 20 and the bypass passage 121 / the bypass passage 122, and it is also possible to open and close the exhaust passage. The cooler 119 may have a configuration that indirectly exchanges heat 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 with 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 cooler 119 is used for cooling. At this time, the exhaust gas guided from the dust removing means 6 to the pipe 105 is supplied to the denitration means 106 via the three-way valve 123, the cooler 119, the three-way valve 124 and the bypass passage 122. At this time, part of the exhaust gas may be diverted to the bypass passage 121 because the temperature is not adjusted.

The temperature of the exhaust gas from the diesel engine 1 is
When the temperature of the catalyst 115 of the denitration means 106 is too low, the exhaust gas from the dust removing means 6 is heated in the heater 120 from the conduit 106 through the three-way valve 123, the bypass passage 121, and the three-way valve 124, and thus, the denitration means 106 Is supplied to. Therefore, the catalyst 115 of the denitration means 106 is kept, for example, in the range of about 300 to about 500 ° C., which prevents the deposition of acidic ammonium sulfate, promotes the sintering of the catalyst components, and causes the crystal phase transition. It can be prevented.

Further, when the exhaust gas from the diesel engine 1 has an appropriate temperature in the denitration catalyst 115, the exhaust gas does not pass through the coolers 119 and 120, but the exhaust gas from the dust removing means 6 is supplied to the pipe 105, the three-way valve. 123,
Bypass passage 121, three-way valve 124 and bypass passage 12
2 through the pipe 126 to the denitration means 106.

As another embodiment of the present invention, the dust removing means 6 of FIG. 5 may be provided in the middle of the pipeline 126 instead of being provided between the diesel engine 1 and the three-way valve 123. Good.

FIG. 6 is a system diagram showing the overall construction of another embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 5, but it should be noted that cooler 119 in FIG.
Instead of the turbocharger 7, a turbocharger 7 including a turbine 8 and a blower 13 is used.
The bypass passage 116 connected between the inlet and the outlet of the valve is used, and the flow control valve 117 is used instead of the three-way valve 123. The flow rate control valve 117 has an opening / closing function. The exhaust gas is expanded by the turbine 8 and its temperature is lowered, whereby the function of cooling the exhaust gas is achieved. The opening of the flow control valve 117 is adjusted for temperature adjustment.

FIG. 7 is a system diagram showing the overall construction 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 parts are designated by the same reference numerals. It should be noted that, in this embodiment, a 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.
Is introduced into the mixer 107 of the denitration means 106 and used to dilute the reducing agent from the reducing agent supply source 108. A flow rate control valve 130 is interposed in the bypass passage 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 passage 129 is set to the cooler 16. It is negligible compared to the flow rate of combustion air supplied. Therefore, even if such a bypass passage 129 is provided and the 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 construction of still another embodiment of the present invention. In this embodiment, although similar to the embodiment of FIG. 7 described above, it should be noted that in this embodiment, a carburetor 133 is provided in the pipe line 9 on the downstream side of the supercharger 7, and the carburetor 133 is provided in the carburetor 133. A part of the exhaust gas is guided from the pipe 9 through the pipe 134. A flow rate control valve 135 is interposed in the pipe line 134. The 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 is pressure-fed, and is vaporized by the heat from the heat transfer pipe 136 to which the exhaust gas supplied through the pipe 134 in the vaporizer 133 is guided, and is vaporized in the pipe 137. The reducing agent is introduced. This reducing agent is supplied from the conduit 128 of the denitration means 106 to the mixer 1
07, and mixer 1 similar to the embodiment of FIG.
At 07, it is diluted with air through the bypass 129 and the flow control valve 130. Other configurations are the same as those in the above-mentioned embodiment.

FIG. 9 is a block diagram showing the overall construction 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 pipe 136 of the carburetor 133 is A part of the exhaust gas flowing in the pipeline 5 on the upstream side of the turbine 8 of the supercharger 7 is branched and guided.

FIG. 10 is a vertical sectional view showing the overall structure of the dust removing means 6 according to the embodiment of the present invention. In the dust remover 6, the exhaust gas to be treated containing the dust and NOx is generated from, for example, a diesel engine and supplied to the housing 25 through the inlet 26. The housing 25 may also serve as an exhaust collecting pipe. In the housing 25, the first right cylindrical container 3 in which the dust-removing particle filling layer 39 is formed
0 and a second right cylindrical container 31 coaxially provided in the first container 30 are provided, and the second container 31 is driven to rotate about the horizontal axis 20 by the drive cylinder 21. A centrifugal fluidized bed of the granular denitration catalyst 22 is formed. The exhaust gas to be treated from the inlet 26 has its particles removed in the particle-removing particle-filled layer 39 of the first container 30 and proceeds inward in the radial direction, and is further denitrated by the granular denitration catalyst 22 in the second container 31, The gas thus cleaned is discharged through the right cylindrical passage 5. The drive cylinder 21 and the base end portions of the pipe 5 are fixed to the end plates 67 and 68 of the second container 31, and are provided on the end plates 37 and 38 of the first container 30 rotatably with respect to each other by bearings 69 and 70. To be

The base ends of right 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 fixed to the housing 25 by bearings 75 and 76. It is rotatably supported. 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 as to form a centrifugal fluidized bed of the particulate denitration catalyst 22, and is supported by this. Tube 7
3, and thus the first container 30 is driven for regeneration at a low speed, eg one revolution every few hours.

The dust removing means 6 shown in FIG. 10 is used in connection with the two-cycle 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 conduit 3 to the dust removing means 6, and exhaust gas from the dust removing means 6 is discharged via 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. Supercharger 7
Combustion air is supplied from a pipe line 14 to a blower 13 which is rotatably driven by a turbine 8 of, and the air from the blower 13 is guided to a cooler 16 from a pipe line 15 and cooled,
The gas is introduced from the pipe 17 through the scavenging pipe 18 into each cylinder of the diesel engine 1.

FIG. 12 is an enlarged sectional view of a part of the first container 30 in FIG. 1, and FIG. 13 is an axis line 20 of the first container 30.
FIG. 14 is a partial cross-sectional view as seen from a cross-section perpendicular to, and FIG. 14 is a cross-sectional view as seen from a cross-section passing through the axis 20 of the first container 30. With reference to these drawings, the first container 30 is
It has a large number of units 32 that are spaced apart in the circumferential direction. Each unit 32 is provided with a porous inner support plate 33 and a porous outer support plate 34 provided inside and outside the radial direction, partition plates 35 and 36 arranged at intervals in the circumferential direction, and arranged at intervals in the axial direction. It is constituted by a pair of end plates 37, 38 that are formed. The unit 32 is made of metal. Inside each unit 32, a particle-filling layer 39 for removing dust particles, which is filled with a particulate filter material, is formed. The granular filter material forming the particle packed layer 39 is, for example, a thermally stable ceramic granulated material such as alumina, mullite, or silica, and the outer diameter thereof may be 1 to 5 mmφ. Further, catalyst particles such as Pt, Pd, MnO, and NiO that are effective in promoting dust combustion may be mixed. The ceramic granules may be coated with a material similar to the above-mentioned catalyst particles.

Thus, the first container 30 is formed into a tubular shape as a whole. The inner and outer support plates 33, 34 are realized by, for example, punching metal and wire mesh.
Other units 32a, 3 adjacent to one unit 32
Corresponding parts of 2b may be shown with the same numerals with subscripts a and b, and in general, these subscripts a and b may be omitted. In the unit 32, cooling chambers 41 and 42 are formed on both sides in the circumferential direction by the intermediate partition plates 59 and 60, respectively, and thus the units 32 and 32a adjacent to each other in the circumferential direction are separated via the cooling chambers 41 and 41a. In addition, the units 32 and 32b include cooling chambers 42 and 42b.
Are separated by. The radially inner ends of the cooling chambers 41 and 42 are closed by the sealing plates 43 and 44, and the radially outer ends are closed by the sealing plates 45 and 46. Vent holes 47 and 48 are formed in the sealing plates 45 and 46. The ends on the radially inner side of the cooling chambers 41, 42 are 1
Alternatively, a plurality of (two in this embodiment) conduits 49 are used for communication.

FIG. 15 is an enlarged cross-sectional view of the vicinity of the radially inner end of the cooling chamber 41. The pipe 49 is airtightly 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, regeneration gas supply means 51 is arranged at a position above the housing 25 of the dust removing means 6. In the casing 77 of the regeneration gas supply means 51, via the pipe line 52 shown in FIG.
A part of the high temperature air of 100 to 150 ° C. is branched and supplied from the blower 13 via the pipe 15. This conduit 52
Is heated by a heater 53, such as an electric heater, and opens into the particle-packed layer 39 of one or more (in this example, one) unit 32, and thus one particle-packed layer 39, Supply temperature air,
The filter material is regenerated by burning the dust particles in the exhaust gas adhering to or adsorbed on the filter material filled in the particle packing layer 39. At this time, the temperature of the unit 32 is, for example, 1000
Since it becomes a high temperature of ℃ or more, in order to improve heat resistance,
A nozzle 55 for supplying air, which is a cooling gas, from a ventilation hole 47 is attached to the exhaust collecting pipe 4 in one cooling chamber 41. The air supplied to the cooling chamber 41 passes through the pipeline 4
9 and flows into the other cooling chamber 42, passes through the vent hole 48, and is discharged from the pipe 56 attached to the exhaust collecting pipe 4. In the pipe 55, the air cooler 16 shown in FIG.
From which the cooled air is supplied via the pipe line 17.

Referring again to FIG. 12, the partition plate 36 is inclined with respect to the radial line 57 of the container 19 at an angle θ1. Therefore, although the space 58 is formed in the upper part of the particle packing layer 39 of each unit 32, the 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 packing layer 39. Therefore, it is possible to ensure that the dust particles in the exhaust gas are collected, prevent the filter material of the particle-filled layer 39 from being offset as much as possible, and regenerate the particle-filled layer by incinerating the dust particles as described above. Easily possible.

Next, the structure of the second container 31 will be described. The right cylindrical dispersion plate 78 provided coaxially with the axis 20 is made of a metal plate such as punching metal having a large number of ventilation holes, and the powdery denitration catalyst 22 attached to the dispersion plate 78 by centrifugal force is used. To support. The cylindrical filter member 7 extends radially inward and extends between the end plates 67 and 68.
9 is attached. The filter member 79 prevents the particulate denitration catalyst 22 from being discharged together with the gas into the pipe 5.
The particle size of the granular denitration catalyst is, for example, on the order of μm, which increases the surface area and improves the reactivity. Examples of the particulate denitration catalyst 22 include V ₂ O ₅ —TiO ₂ , V ₂
O ₅ —WO ₃ —TiO ₂ , CuO—Al ₂ O ₃ and inert particles are mixed, and NH ₃ as a reducing agent is added to the gas to be treated in the required reaction equivalent amount, and the gas to be treated is supplied. Thus, by removing the dust particles in the first container 30,
It is possible to prevent the dust particles from clogging the passage holes, which are many pores of the dispersion plate 78, and causing clogging. As a denitration catalyst, V ₂ O ₅ , WO ₃ and Cu may also be used on the surface of thermally granulated ceramic granules such as alumina, bright and silica.
It may have a structure in which O or the like is supported, and may further have another structure.

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 porous inner support plate 33 and the porous outer support plate 34 of the first container 30. Perforated support plate 34
In the space between the porous partition plate 81 and the porous partition plate 81, the particle removal layer 39 for removing dust particles is provided. A granular denitration catalyst 82 is filled between the porous partition plate 81 and the in-porous support plate 33. As a result, the exhaust gas from which the particulates have been removed in the particulate removal particle packed layer 39 is NOx in the granular denitration catalyst 82 packed bed.
Are supplementarily removed, and thereafter, denitration is surely performed in the second container 31. Such a granular denitration catalyst 82
By forming the filling layer of 1 in the first container 30, the load of the granular denitration catalyst 22 in the second container 31 is reduced, and the overall configuration can be downsized.

FIG. 17 is a diagram showing a simplified structure of the transmission 24. 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 that constitutes the planetary gear device,
The corresponding gear 84 is fixed to the drive cylinder 21. A plurality of planet gears 85 mesh with the corresponding gear 84, and the planet gears 8
Internal gear ring gear 86 meshes with 5. The support cylinder 73 is fixed to the ring gear 86. In this way, the drive cylinder 21 is rotationally driven at a high speed, while the support cylinder 73 is rotationally driven at a low speed with a small configuration. The transmission 24 may be realized by other configurations.

[0054]

As described above, according to the present invention, the dust contained in the exhaust gas from an internal combustion engine such as a diesel engine is removed by the dust removing means, and then introduced to the denitration means using a catalyst. As a result, the catalyst does not become clogged with dust or the like, which prevents the deterioration of the catalytic function and therefore does not decrease the denitration efficiency and does not increase the pressure loss.

Further, according to the present invention, the temperature of the exhaust gas supplied to the denitration means is adjusted by the temperature adjusting means to be, for example, about 300 to about 500 ° C., so that the catalyst included in the denitration means. However, if the temperature of the exhaust gas is too low, the adhesion of acidic ammonium sulfate will not occur and the catalyst performance will not deteriorate, and the temperature of the exhaust gas will be too high to promote the sintering of the catalyst components or cause the phase transition of crystals. Can be prevented.

Further, according to the present invention, the dust removing means is provided upstream of the temperature adjusting means, whereby the dust entering and adhering to the temperature adjusting means causes a problem that heat exchange efficiency is lowered. 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 to be used for diluting the reducing agent from the reducing agent supply source. There is no need to install a new blower to dilute the
The configuration can be simplified. Moreover, the air from the blower used for such dilution is compared with the flow rate of the air supplied from the blower as combustion air for the internal combustion engine.
A sufficiently small value is sufficient, 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.

As described above, according to the present invention, the exhaust gas to be treated supplied into the housing is free of dust particles by the dust particle filling layer in the filling space formed in the first cylindrical container. Next, the exhaust gas is purified by the denitration by the granular denitration catalyst forming the centrifugal fluidized bed held by the tubular dispersion plate in the second tubular container that is driven to rotate about the horizontal axis, and the exhaust gas is purified. Since the gas after the dust is removed in the first container is supplied to the plate, the dispersion plate is not clogged, and its particle size is small in order to increase the surface area of the denitration catalyst. Can also be held by the dispersion plate.

Further, according to the present invention, the first container can also be driven to rotate about the horizontal axis to supply the regeneration gas to the particle-removing particle-packed layer to burn the particles for regeneration. This enables continuous operation for a long time.

Furthermore, according to the present invention, the filling space of the first container contains not only the particles for removing dust particles but also the granular denitration catalyst, so that the denitration load of the denitration catalyst in the second container can be reduced. , Miniaturize the structure.

[Brief description of drawings]

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

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

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

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

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

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

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

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

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

FIG. 10 is a vertical cross-sectional view showing the overall configuration of an embodiment of the present invention.

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

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 seen from a cross section perpendicular to the axis 20 of a part of the first container 30. It is a partially expanded sectional view of the container 19 in FIG.

FIG. 14 is a cross-sectional view seen from a cross section parallel to the axis 20 of the first container 30.

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 the first container 30 according to another embodiment of the present invention.

FIG. 17 is a diagram showing a simplified example of a transmission device 24.

[Explanation of symbols]

 1 Diesel engine 6 Exhaust gas purifying device 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 Straight cylindrical container 32 Unit 33 Porous inner support plate 34 Outer porous support plate 37, 38, 67, 68 End plate 39 Particle-removing particle packing layer 51 Regeneration gas supply means 81 Porous partition plate 82 Granular denitration catalyst

Claims (10)

[Claims] 1. A particulate matter removing unit for removing particulate matter from exhaust gas of an internal combustion engine, and a unit provided downstream of the particulate matter removing unit for denitrifying the exhaust gas using a catalyst. Exhaust gas purification device. 2. An exhaust gas purifying apparatus comprising: a means for adjusting the temperature of exhaust gas of an internal combustion engine; and a means provided downstream of the temperature adjusting means for denitrifying the exhaust gas using a catalyst. 3. A dust removing means for removing dust from the 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 provided downstream of the temperature adjusting means, An exhaust gas purifying apparatus comprising: means for denitrifying exhaust gas using a catalyst. 4. A supercharger having a turbine driven by exhaust gas of an internal combustion engine, a blower driven by this turbine to supply combustion air to the internal combustion engine, and exhaust gas using a catalyst and a reducing agent. Denitration means, a reducing agent supply source that supplies a reducing agent, and a bypass means that diverts a part of the air from the blower to dilute the reducing agent from the reducing agent supply source and guide it to the denitration means. An exhaust gas purification device characterized by: 5. The reducing agent supply source supplies a liquid reducing agent, 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 led to the denitration means. The exhaust gas purifying apparatus according to claim 4, wherein a vaporizer is provided. 6. The exhaust gas purifying apparatus according to claim 4, wherein at least an upstream of the denitration means is provided with a dust removing means for removing dust of exhaust gas. 7. The dust removing means is provided between a housing to which the exhaust gas to be treated is supplied, a porous inner support plate provided inside the housing, and a porous inner 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 dust is formed in the space; and rotatably provided in the first container about a horizontal axis,
The present invention is characterized by including a second tubular container that partially stores a granular denitration catalyst in a tubular dispersion plate to form a centrifugal fluidized bed, and means for rotationally driving the second container around its axis. The exhaust gas purifying apparatus according to claim 1, 3 or 6. Exhaust gas purification device. 8. The first container is rotatably provided around a lateral axis, and is provided in a position close to the outside of the first container and a means for rotationally driving the first container around the axis, and a dust carrier. The exhaust gas purifying apparatus according to claim 7, further comprising a means for supplying a regeneration gas to the removal particle packed bed. 9. The exhaust gas purifying apparatus according to claim 7, wherein the filling space of the first container also contains a particulate denitration catalyst. 10. The first container comprises: the inside-porous support plate and the outside-pore support plate; partition plates arranged at intervals in the circumferential direction; and a pair of end plates arranged at intervals in the axial direction. 8. The exhaust gas purifying apparatus according to claim 7, wherein a plurality of units are constituted by the above, and the regeneration gas supply means supplies the regeneration gas to the particle packed bed of at least one unit.