JP2003003835A - Exhaust emission control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of firstly reducing or removing carbon monoxide and hydrocarbons, next carbon particulate being a soot surely and further nitrogen oxides. SOLUTION: This exhaust emission control device 12 is equipped in an exhaust pipe 2 of exhaust gas 1 and is composed by arranging a deceleration part 15, dispersion part 16, first emission control part 17, treatment part 18, second emission control part 19 and acceleration part 20 in an outer cylinder case 14 in this order. The deceleration part 15 comprises a short cylinder enlarged in diameter toward its end and the dispersion part 16 comprises a baffle plate 24 with a wall hole 23. The first emission control part 17 is composed by bonding and coating an oxidation catalyst onto a honeycomb core 27 and the treatment part 18 is provided with a rectifying portion 32, acceleration portion 33 and discharge portion 34. The second emission control part 19 comprises a filter 37 which bonds the oxidation catalyst, is coated therewith and has a wire mesh structure, and the acceleration part 20 comprises a short cylinder reduced in diameter toward its end.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an exhaust gas purifying apparatus. For example, the present invention relates to a purification device installed in an exhaust pipe in order to reduce and remove harmful substances contained in exhaust gas of a diesel engine.

[0002]

2. Description of the Related Art << Technical Background >> Carbon monoxide CO, hydrocarbons H are present in exhaust gas of an internal combustion engine such as a diesel engine.
It contains harmful substances such as C, carbon particles PM and nitrogen oxide NOx. Therefore, if exhaust gas containing such harmful substances is directly discharged to the outside air, it is harmful to the human body and the environment, and reduction and removal of harmful substances is an important theme to prevent pollution.

<Prior Art> FIG. 5 is a side cross-sectional view of an exhaust gas purifying apparatus according to a conventional example of this kind. As shown in FIG. 5, for example, in an exhaust system of a diesel engine of an automobile, the exhaust pipe 2 for the exhaust gas 1 has a structure as shown in FIG.
The purifying device 3 as shown in (1) is interposed as a converter. The purifying device 3 has a configuration in which the first purifying unit 5 and the second purifying unit 6 are sequentially provided in the outer cylinder case 4 having a diameter larger than that of the exhaust pipe 2. The first purification unit 5
An oxidation catalyst is adhered and coated on each cell wall 8 of the honeycomb core 7 to oxidize, burn, and reduce harmful substances such as carbon monoxide CO and hydrocarbons HC in the exhaust gas 1.
I had to remove it. The second purifying unit 6 is formed by adhering and coating an oxidation catalyst on each hole wall 10 of the filter 9 made of high-density porous ceramics, so that the carbon particles PM that are harmful substances in the exhaust gas 1 are captured. Then, oxidation, combustion, and reduction and removal were carried out.

[0004]

<Regarding the First Problem> By the way, a purification apparatus 3 for exhaust gas 1 of this type of conventional example
In that case, the following problems were pointed out. First of all,
It has been pointed out that the reduction and removal of harmful substances such as carbon monoxide CO and hydrocarbon HC are insufficient. That is, the exhaust gas 1 flowing through the exhaust pipe 2 has a higher flow velocity toward the central portion than the outer peripheral portion, and contains a large amount of harmful substances such as carbon monoxide CO and hydrocarbon HC. Then, as a result of such a flow of the exhaust gas 1 being brought into the outer case 4 of the purifying device 3 as it is, carbon monoxide CO and hydrocarbons HC are present in the central portion of the honeycomb core 7 of the first purifying unit 5. In addition, it becomes concentrated and unevenly distributed, and it will pass at high speed. As a result, the oxidation catalyst does not function sufficiently as a whole (especially, it does not function in the outer peripheral portion), the oxidation and combustion of carbon monoxide CO and hydrocarbon HC become insufficient, and eventually carbon monoxide CO and hydrocarbon HC It was pointed out that there was a problem of reduction and lack of removal. Furthermore, the temperature rise of the oxidation catalyst in the first purification section 5 is insufficient and often insufficient for the function to be exerted. From this aspect as well, the oxidation catalyst does not sufficiently function, and carbon monoxide CO and hydrocarbons It has been pointed out that there is a problem of insufficient oxidation, combustion, reduction and removal of HC.

<Regarding the Second Problem> Secondly, it has been pointed out that the reduction and removal of the harmful carbon particles PM is uncertain. That is, for the same reason as described above, the carbon particles P contained in the exhaust gas 1
The M is concentrated and unevenly distributed in the central portion of the filter 9 of the second purification unit 6 of the purification device 3 and passes at a high speed.
Therefore, it has been pointed out that the oxidation catalyst does not function sufficiently, and capture, oxidation, combustion, and reduction and removal of carbon particles PM are not reliable. Further, the ceramic filter 9 of the second purifying unit 6 is apt to be damaged and destroyed by heating due to a rapid temperature rise accompanying the combustion of the carbon particles PM. From this aspect, the capture, oxidation and combustion of the carbon particles PM are also performed. ，
It was pointed out that the reduction and removal became uncertain.

<Regarding Third Problem> Thirdly, it has been pointed out that the nitrogen oxide NOx, which is a harmful substance, cannot be reduced or removed. That is, in the purifying device 3 shown in FIG. 5 which is frequently used in this type of conventional example, the nitrogen oxide NOx in the exhaust gas 1 is not reduced or removed, and thus,
In order to reduce and remove the nitrogen oxide NOx, it is necessary to additionally install a dedicated purifying device in the exhaust pipe 2.

<Regarding the Present Invention> The exhaust gas purifying apparatus of the present invention has been made in order to solve the problems of the above-mentioned conventional example in view of such circumstances. The first aspect of the invention is characterized in that a predetermined decelerating portion, a dispersing portion, a first purifying portion, a second purifying portion, an accelerating portion, and the like are arranged in order for exhaust gas. According to the second aspect of the present invention, the exhaust gas has a predetermined first
A purification unit, a treatment unit, a second purification unit, an acceleration unit, and the like are arranged in this order, and the treatment unit is provided with a rectification unit, an acceleration unit, and a discharge unit in order. Therefore, the present invention is the first
In addition to effectively reducing and removing carbon monoxide and hydrocarbons, secondly, surely reducing and removing carbon particles, and thirdly, reducing and removing nitrogen oxides. The purpose is to propose a purification device.

[0008]

[Means for Solving the Problems] << First Invention >>
The technical means of the present invention for solving such a problem are as follows. First, the first invention is as follows. The exhaust gas purifying apparatus according to claim 1, which is an independent claim of the first invention, is installed in an exhaust pipe to reduce and remove harmful substances contained in the exhaust gas, and a deceleration portion for the exhaust gas, The dispersion section and the first purification section are provided in this order. According to a second aspect of the present invention, in the exhaust gas purifying apparatus according to the first aspect, the deceleration section, the dispersion section, and the first purification section are arranged in order from the upstream side in an outer cylinder case having a diameter larger than the exhaust pipe. There is.
The deceleration portion is composed of a short cylinder whose diameter gradually widens to decelerate the exhaust gas. The dispersion unit is composed of a baffle plate in which a large number of wall holes are formed, and uniformly disperses, straightens, accelerates, and raises the temperature of the exhaust gas. The first purification section is formed by adhering and coating an oxidation catalyst on the cell walls of the honeycomb core, and oxidizing, burning, and reducing and removing harmful substances such as carbon monoxide and hydrocarbons in the exhaust gas. Characterize. The exhaust gas purifying apparatus according to claim 3 is the exhaust gas purifying apparatus as claimed in claim 2, wherein the deceleration portion is disposed at an inlet of the outer cylinder case, and a gap exists between an outer peripheral surface and the outer cylinder case, and an internal flow is generated. A diffusion wing is provided on the road.

The exhaust gas purifying apparatus according to a fourth aspect is the exhaust gas purifying apparatus according to the second aspect, wherein each of the wall holes of the baffle plate of the dispersion portion is formed in a generally regular positional relationship and is extended. It is characterized by having an exit wall.
An exhaust gas purifying device according to claim 5 is the exhaust gas purifying device according to claim 4,
The dispersion portion is formed by using a plurality of the baffle plates, and the positions of the wall holes between the baffle plates are deviated from each other. According to a sixth aspect of the present invention, in the exhaust gas purifying apparatus according to the second aspect, the second purifying unit is arranged inside the outer cylinder case downstream of the first purifying unit. The second purification unit is composed of a filter having a wire mesh structure in which metal wires are assembled in a mesh shape, and captures soot, that is, carbon particles, which are harmful substances in the exhaust gas, and oxidizes, burns, and reduces them. ， Removable. According to a seventh aspect of the exhaust gas purifying apparatus of the second aspect, an accelerating portion is arranged at the outlet of the outer cylinder case.
Further, the accelerating portion is composed of a short cylinder whose diameter is gradually reduced to a small diameter, and accelerates the exhaust gas.

<< Second Invention >> Next, the second invention is as follows. The exhaust gas purifying apparatus according to claim 8 which is an independent claim of the second invention is interposed in the exhaust pipe and has a diameter larger than that of the exhaust pipe in order to reduce and remove harmful substances contained in the exhaust gas. An exhaust gas processing unit is provided in the outer cylinder case. The processing section is characterized in that a rectifying section, an accelerating section, and a discharging section are sequentially arranged. The exhaust gas purifying apparatus according to claim 9 is the exhaust gas purifying apparatus according to claim 8, wherein the processing section includes a partition plate that divides the inside of the outer cylinder case into front and rear through an intermediate space; It is provided with a pipe for communicating the plates, and the rectifying portion, the accelerating portion, and the discharging portion, which are sequentially arranged on the pipe from the upstream side. The exhaust gas is characterized in that it is accelerated, the temperature is raised, and the exhaust gas is uniformly discharged. According to a tenth aspect of the present invention, in the exhaust gas purifying apparatus according to the ninth aspect, the rectifying portion is made of a honeycomb core and rectifies the inflowing exhaust gas. The accelerating portion is composed of a cylindrical body whose diameter is gradually reduced to a small diameter, and causes the exhaust gas to be greatly accelerated, temperature raised, and heated. The discharge portion is formed of an elbow and is characterized in that the exhaust gas is uniformly dispersed and discharged toward the inside of the outer cylinder case.

According to an eleventh aspect of the present invention, there is provided the exhaust gas purifying apparatus according to the tenth aspect, wherein the acceleration portion has a small-diameter throttle portion formed in the middle thereof and a plurality of openings downstream from the small-diameter throttle portion. ing. The exhaust gas is divided into a central main flow that is accelerated at a high speed and an outer peripheral sub-flow that has passed through the opening at a relatively low speed, and then joins in the vicinity of the discharge portion. According to a twelfth aspect of the present invention, in the exhaust gas purifying apparatus according to the tenth aspect, the first purifying unit is arranged in the outer cylinder case upstream of the processing unit. The first purification unit is formed by adhering and coating an oxidation catalyst on the cell walls of the honeycomb core, and oxidizing, burning, reducing, and removing carbon monoxide and hydrocarbon that are harmful substances in the exhaust gas. , Is characterized. The exhaust gas purifying apparatus according to claim 13 is the exhaust gas purifying apparatus as set forth in claim 10, wherein hydrocarbons and soot carbon particles in the exhaust gas rise in temperature in a gas phase in the outer cylinder case downstream of the processing unit, It functions as a reducing agent due to heating, and removes nitrogen oxides, which are harmful substances in the exhaust gas,
It is characterized by being reduced and removed by reduction. An exhaust gas purifying apparatus according to a fourteenth aspect is the exhaust gas purifying apparatus according to the tenth aspect, wherein a second purifying section is disposed in the outer cylinder case downstream of the processing section. The second purification unit is composed of a filter having a wire mesh structure in which metal wires are assembled in a mesh shape, and captures soot, that is, carbon particles, which are harmful substances in the exhaust gas, and oxidizes, burns, and reduces them. ， Removable. According to a fifteenth aspect of the present invention, in the exhaust gas purifying apparatus according to the tenth aspect, an accelerating portion is arranged at the outlet of the outer cylinder case. Further, the accelerating portion is composed of a short cylinder whose diameter is gradually reduced to a small diameter, and accelerates the exhaust gas.

<Regarding Operation> The present invention is configured as described above, and is as follows. This purifying device is interposed in an exhaust pipe, and is provided in an outer cylinder case with a reduction unit and a dispersion unit (first unit).
Invention), a first purifying section, a processing section (second invention), a second purifying section, an accelerating section, etc. are sequentially arranged. Then, the exhaust gas is subjected to the following steps to reduce and remove the contained harmful substances such as carbon monoxide, hydrocarbons, carbon particles, and nitrogen oxides. First, the exhaust gas is supplied to the deceleration unit at the inlet. The deceleration part consists of a short cylinder with a large diameter, and there is a gap between the outer cylinder case and a diffusion blade. , Slow down evenly. The exhaust gas is then supplied to the dispersion section. The dispersion portion is composed of a baffle plate in which a large number of wall holes having extended walls are formed. Therefore, the exhaust gas that has been diffused and decelerated as described above is uniformly dispersed by passing through each wall hole, Along with rectifying, it accelerates and raises the temperature. It is also conceivable to use a plurality of baffle plates in which the positions of the respective wall holes are displaced as the dispersion portion. Then, the exhaust gas is supplied to the first purification section. The first purification section is formed by adhering and coating an oxidation catalyst on the cell walls of the honeycomb core. As described above, since the exhaust gas is uniformly dispersed, rectified, and the temperature is raised in advance, the oxidation catalyst is totally and surely Functioning, carbon monoxide and hydrocarbons are fully oxidized, burned and effectively reduced,
It can be removed.

The exhaust gas is then supplied to the processing section. The processing section comprises a pipe that connects the front and rear partition plates with each other, and a rectifying section, an accelerating section, and a discharging section are arranged in this order. Therefore, the exhaust gas is rectified by the honeycomb core in the rectifying part, and then is rapidly accelerated by the cylindrical body with a small diameter in the accelerating part. Are dispersed and discharged. In the accelerating portion, a small diameter narrowing portion and a plurality of openings are formed,
The exhaust gas is slightly accelerated in the small-diameter throttle portion, and then is diverged into a central main flow that is accelerated at a high speed and a relatively low-speed outer peripheral sub-flow that has passed through the opening, and then merges at the discharge portion. Therefore, the temperature of the exhaust gas is efficiently increased, and the exhaust gas is accelerated in a well-balanced manner in relation to the flow rate to prevent excessive acceleration, pressure loss, and increased engine load.

Since the temperature of exhaust gas is greatly raised and heated, hydrocarbons and carbon particles come to function as a reducing agent, react with nitrogen oxides in the gas phase on the downstream side, and are harmless. Reduce, reduce, or remove with nitrogen, carbon dioxide, water, etc. Then, the exhaust gas is supplied to the second purification unit. The second purification unit is composed of a wire mesh structure filter, captures soot carbon particles, and oxidizes,
Burn, then reduce and eliminate. At that time, since the exhaust gas is uniformly dispersed, the carbon particles are wholly captured by the filter, and the temperature of the exhaust gas is greatly raised and heated, so that the oxidation catalyst is adhered and coated. Since the oxidation catalyst can function reliably, and because it has a wire mesh structure, it can be prevented from being damaged by heating. Then, the exhaust gas is supplied to the accelerating section at the outlet. The accelerating part is composed of a short cylinder with a small diameter and accelerates exhaust gas. Therefore, the exhaust gas may be further heated due to this acceleration and pressure loss in addition to the temperature rise and heating in the previous processing section, and the unburned hydrocarbons and carbon particles that have not been removed can be reliably discharged. Combustion, decrease,
It can be removed. Then, the purified exhaust gas is discharged to the exhaust pipe on the downstream side.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION << The Drawings >> The present invention will be described in detail below based on the embodiments of the invention shown in the drawings. 1, FIG. 2, FIG. 3, FIG. 4 and the like are provided for explaining the embodiment of the exhaust gas purifying apparatus according to the present invention. FIG. 1 is a side cross sectional explanatory view. Figure 1 (1)
The figure is a sectional view taken along line I-I of FIG.
(2) FIG. 2 is a front view taken along the line II-II of FIG. 3A and 3B are front views of the baffle plate of the dispersion section, FIG. 1A shows one example thereof, FIG. 2B shows another example, and FIG. 3C shows another example. Show. FIG. 4 is a side view of the entire exhaust system.

<< Exhaust System >> First, the exhaust system will be described with reference to FIG. Diesel engine 11
Is widely used for automobiles, power generation, ships, locomotives, aircraft, various machines, and others. In the exhaust gas 1 discharged from the diesel engine 11 and other internal combustion engines, and further in the exhaust gas 1 discharged from the gas turbine, carbon monoxide CO, hydrocarbons HC, carbon particles PM,
Contains harmful substances such as nitrogen oxides NOx. If the exhaust gas 1 containing such harmful substances and pollutants is directly discharged to the outside air, it is harmful to humans and the environment. Therefore, in order to prevent pollution, the exhaust gas 1 should be reduced or removed. The purification device 12 is installed in the exhaust pipe 2 as a converter. That is, fuel is supplied from the fuel tank 13 to the diesel engine 11, and the exhaust gas 1 is supplied from the diesel engine 11 through the exhaust pipe 2.
Is discharged to the outside air via the exhaust pipe 2.
The exhaust system is like this.

<< Regarding the Purifier 12 for Exhaust Gas 1 >> Next, referring to FIG. 4, the purifier 12 for exhaust gas 1 will be described.
The outline of is described. The purification device 12 is interposed in the middle of the exhaust pipe 2 of the exhaust gas 1, and is disposed in the outer cylinder case 14 having a diameter larger than that of the exhaust pipe 2 from the upstream side to the downstream side, the reduction unit 15, the dispersion unit. 16, first purification unit 17, processing unit 18,
The 2nd purification part 19, the acceleration part 20, etc. are arrange | positioned in order. The respective parts are made of metal and are arranged at a distance from each other without making contact with each other. Outer case 1
4 has a cylindrical shape or a rectangular tube shape, and the inlet side and the outlet side thereof have a small diameter corresponding to the diameter of the exhaust pipe 2. Then, the above-mentioned respective parts are arranged inside so as to be detachable from the outside. The exhaust gas 1 is in the temperature range of about 400 ° C. to 450 ° C. during normal operation of the diesel engine 11. The purification device 12 is roughly configured as described above.

<< Regarding the Deceleration Section 15 >> Each section of the purifying device 12 will be described below. First, FIG. 1 and FIG.
The deceleration unit 15 of the purifying device 12 will be described with reference to FIG. The deceleration portion 15 is made of a short cylinder whose diameter gradually increases and is arranged at the inlet of the outer cylinder case 14.
There is a gap 21 between the outer peripheral surface and the outer case 14, and diffusion vanes 22 are provided in the internal flow passage to decelerate and diffuse the exhaust gas 1. The speed reducer 15 will be described in more detail. The deceleration unit 15 includes the outer case 14
It is installed immediately after the small-diameter inlet portion of and is located corresponding to the exhaust pipe 2 on the upstream side. Then, it has a short tubular shape in which the diameter is gradually increased toward the downstream side, and a gap (21) is formed between the small diameter inlet portion of the outer tubular case 14 by a holder (not shown).
It is attached coaxially while the center part is the internal flow path. The diffusion blades 22 have an elongated plate shape, and in the illustrated example, four diffusion blades are used so as to cross the internal flow paths in a cross shape.
The arrangement angles of 2 are different. Therefore, the exhaust gas 1 passes through the deceleration portion 15 as described above, whereby the flow on the central portion side is decelerated along with the increase in the cross-sectional area, and the diffusion blades 22 also work. Is diffused throughout. On the other hand, the flow of the exhaust gas 1 on the outer peripheral side is
It passes through the gap 21 and is guided to the outer peripheral side of the outer case 14. The speed reducer 15 is configured as described above.

<< Distributor 16 >> Next, referring to FIGS.
The dispersion unit 16 of the purification device 12 will be described with reference to FIG. The dispersion unit 16 is composed of a baffle plate 24 having a large number of wall holes 23 formed therein, and uniformly disperses, straightens, accelerates, and raises the temperature of the exhaust gas 1. Each wall hole 23 of the dispersion portion 16 is formed by being formed in a regular positional relationship as a whole, and is provided with an extension wall 25. Such a dispersion unit 16 will be described in more detail. Dispersion unit 16
Is attached to the inner surface of the outer cylinder case 14 with a gap 26 between the deceleration portion 15 and the deceleration portion 15, and in the illustrated example, is composed of a disc-shaped baffle plate 24. The wall hole 23 is formed in such a baffle plate 24 by punching, and various positions, sizes, and numbers of patterns are conceivable in order to fulfill its function. In the example of FIG. 3 (1), one large diameter one in the central part and eight small diameter ones in the outer peripheral part are
It is formed on the concentric circles at an equal pitch. In the example of FIG. 3 (2), three small-diameter ones are formed in the central portion and nine small-diameter ones are formed in the outer peripheral portion on concentric circles at equal pitches. In the example of FIG. 3 (3), nine small diameters are formed in the central portion and nine small diameters are formed in the outer peripheral portion at equal pitches. Further, each wall hole 23 is provided with an extension wall 25 on the downstream side thereof, which effectively shows the function thereof.

Although one baffle plate 24 is used in the example of FIG. 1, a plurality of baffle plates 24 are used and each wall hole 2 between the baffle plates 24 is used.
A configuration in which the position of 3 is shifted is also effective in exhibiting its function. For example, the baffle plate 24 shown in FIG. 3 (2) and the baffle plate 24 shown in FIG. 3 (3).
It is conceivable that the and are arranged side by side at a slight interval. After the exhaust gas 1 is decelerated and diffused by the deceleration unit 15 described above, the exhaust gas 1 collides with the baffle plate 24 of the dispersion unit 16 and passes through each wall hole 23, so that the inside of the outer cylinder case 14 is first. At, the particles are evenly dispersed and rectified into a regular flow that goes straight in parallel from the upstream side to the downstream side. At the same time, the exhaust gas 1 is accelerated by passing through each wall hole 23 with a reduced cross-sectional area, thereby increasing the pressure loss and converting the kinetic energy into heat energy to raise the temperature. . Furthermore, the baffle plate 2
Also in terms of collision loss with No. 4, the kinetic energy is converted into heat energy and the temperature rises. The dispersion unit 16 has such a configuration.

<< First Purifying Unit 17 >> Next, the first purifying unit 17 of the purifying device 12 will be described with reference to FIG. The first purification unit 17 includes the cell wall 2 of the honeycomb core 27.
An oxidation catalyst is attached to and coated on 8 to oxidize, burn, and reduce and remove carbon monoxide CO and hydrocarbons HC in the exhaust gas 1. That is, the honeycomb core 27 of the first purification section 17 is attached to the inner surface of the outer cylinder case 14 with a space 26 between the honeycomb core 27 and the dispersion section 16. Further, platinum Pt, vanadium V, copper Cu, manganese Mn, and other oxidation catalysts are adhered and coated on each cell wall 28 by impregnation, coating or the like. Therefore, the exhaust gas 1 passes through the hollow columnar cells formed by the cell walls 28 of the honeycomb core 27, whereby a considerable part of the contained carbon monoxide CO and hydrocarbons HC is generated. , Oxidized, burned, and thus reduced and eliminated. The first purification unit 17 is configured in this way.

<< Processing Unit 18 >> Next, the processing unit 18 of the purification device 12 will be described with reference to FIG. The processing unit 8 includes a partition plate 30 that divides the outer casing 14 into front and rear parts through an intermediate space 29, a pipe 31 that is smaller in diameter than the exhaust pipe 2 and that communicates between the front and rear partition plates 30, and upstream of the pipe 31. A rectifying portion 32 and an accelerating portion 3 which are sequentially arranged from the side
3, the discharge part 34, and. The processing unit 18 will be described in more detail. The front and rear two partition plates 30 of the processing unit 8 are attached to the inner surface of the outer cylinder case 14 with an intermediate space 29 therebetween, and thus the outer cylinder case 14 is provided.
The inside is divided into front and back. The pipe 31 is attached between the front and rear partition plates 30 as described above, and the front partition plate 3 is attached.
The space 26 formed between 0 and the first purification unit 17 and the space 26 formed between the rear partition plate 30 and the second purification unit 19 communicate with each other. The diameter of the pipe 31 is set to be smaller than the outer cylinder case 14 and the exhaust pipe 2, for example, about half the diameter of the exhaust pipe 2.

The rectifying portion 32 of the processing section 18 is made of a honeycomb core, is installed in the pipe 31, and is open at the upstream side space 26 of the partition plate 30 on the front side.
The exhaust gas 1 flowing in from is rectified into a regular flow that goes straight in parallel from the upstream side to the downstream side. The accelerating portion 33 of the processing unit 18 is made of a long cylinder whose diameter is gradually reduced to a small diameter, and the exhaust gas 1 passes through the accelerating portion 33, so that the cross-sectional area is narrowed and greatly accelerated. To be done. That is, the exhaust gas 1 is first accelerated by flowing into the small-diameter pipe 31, and then is further greatly accelerated in the acceleration portion 33. As a result, the exhaust gas 1 increases in pressure loss, and the kinetic energy is converted into heat energy correspondingly, and the temperature of the exhaust gas 1 is greatly raised and heated.

In the accelerating portion 33 of the illustrated example, a small-diameter throttle portion 35 is formed on the way, and a plurality of openings 36, such as four, are circumferentially provided at a regular pitch downstream of the small-diameter throttle portion 35. The exhaust gas 1 is accelerated at high speed 6
After being divided into a central main flow of about 5% and a peripheral low-speed flow of about 35% that has passed through the opening 36, they join together in the vicinity of the discharge portion 34. That is, the small-diameter throttle portion 35 formed at the upstream end of the acceleration portion 33 once becomes a small diameter, → a large diameter again, and → a shape gradually increasing from the smallest diameter to the exhaust gas 1 Is the small-diameter throttle part 3
With a small taper of 5, the entire body is first accelerated. After that, especially the speed was increased (2% to 5% compared to the peripheral sidestream).
The central main flow is guided straight to the discharge portion 34 as it is, while the relatively slow outer peripheral sub-flow is accelerated with the inner surface of the pipe 31 via the formed opening 36. It is guided between the outer surface of the portion 33.

The exhaust gas 1 divided into the central main flow and the peripheral sub-flow joins in the vicinity of the discharge portion 34, but the central main flow increases in pressure loss with the extremely high speed. , The peripheral sidestream is the pipe 31, the acceleration part 3
3. With the contact with the discharge part 34, the pressure loss increases, and the kinetic energy is converted into heat energy by that amount respectively, so that the temperature of the exhaust gas 1 is largely raised and heated. The discharge portion 34 of the processing unit 18 is made of an elbow and is integrally provided with the same diameter as the pipe 31. The exhaust gas 1 is evenly distributed with respect to the space 26 formed between the processing unit 18 and the second purification unit 19. The angle, length, and position of the dispersed discharge are set. For example, the elbow of the discharge portion 34 has a spirally curved shape. Processing unit 1
8 is like this.

<< Second Purifying Unit 19 >> Next, the second purifying unit 19 of the purifying device 12 will be described with reference to FIG. The second purification unit 19 includes a filter 37 having a wire mesh structure in which metal wires are assembled in a mesh shape, and captures soot carbon particles PM in the exhaust gas 1,
Oxidize, burn, and reduce and eliminate. That is, the filter 37 of the second purifying unit 19 has a wire mesh structure in which ultrafine metal wires made of stainless steel or other metal are assembled in a fine and dense vertical / horizontal mesh / fibre shape. In some cases, platinum Pt, vanadium V, copper Cu, manganese Mn, and other oxidation catalysts are attached and covered on the wire by impregnation, coating, or the like. Of course, such an oxidation catalyst is often used without being attached or coated. When the exhaust gas 1 passes through the second purification unit 19 as described above, the soot carbon particles PM, that is, the impure carbon fine particles generated by the incomplete combustion of the fuel, are captured and accumulated, and are oxidized. ， It is burned, so it is reduced and eliminated. Second purification unit 1
9 is like this.

<< About Accelerator 20 >> Next, referring to FIGS.
The acceleration unit 20 of the purification device 12 will be described with reference to FIG. The accelerating unit 20 is arranged at the outlet of the outer cylinder case 14, and is composed of a short cylinder whose diameter is gradually reduced to a small diameter, and accelerates the exhaust gas 1. That is, the acceleration unit 20
Is installed immediately before the small diameter outlet portion of the outer cylinder case 14 and is positioned corresponding to the exhaust pipe 2 on the downstream side. And
It has a short tubular shape with the diameter gradually decreasing toward the downstream side, and is coaxially attached by a holder (not shown) to the vicinity of the small-diameter outlet portion of the outer cylinder case 14, and the central portion has an internal flow path. Has become. Therefore, the exhaust gas 1 is accelerated by the reduction of the cross-sectional area by passing through the accelerating section 20 and is discharged to the exhaust pipe 2 on the downstream side and to the outside air.
At that time, a suction force is generated and acts on the inside of the outer cylinder case 14 due to the entanglement with the atmospheric pressure. The acceleration unit 20 has such a configuration.

<< Regarding Operation and the Like >> The present invention is configured as described above. Therefore, it becomes as follows.
As shown in FIG. 4, the purification device 12 for the exhaust gas 1
Is interposed in the middle of the exhaust pipe 2 for the exhaust gas 1, and is disposed in the outer cylinder case 14 in the speed reduction unit 15, the dispersion unit 16, and the first purification unit 1.
7, a processing unit 18, a second purifying unit 19, an accelerating unit 20, etc. are arranged in order from the upstream side. Then, as shown in FIG. 1, the purifying device 12 for the exhaust gas 1 traces the following steps: ,,,,, so that the carbon monoxide CO contained in the exhaust gas 1, It reduces and removes harmful substances such as hydrocarbons HC, carbon particles PM, and nitrogen oxides NOx.

First, the exhaust gas 1 flows through the exhaust pipe 2 at a higher flow velocity toward the central portion side than the outer peripheral portion while containing a large amount of harmful substances in a concentrated manner, and reaches the purifying device 12, and the outside thereof. It is supplied to the speed reducer 15 at the inlet of the cylindrical case 14. Then, the speed reduction unit 15 reduces the speed of the exhaust gas 1 flowing from the exhaust pipe 2 while diffusing it. That is, the deceleration portion 15 is formed of a short cylinder that gradually expands in diameter, a gap 21 exists between the outer peripheral surface thereof and the outer cylinder case 14, and diffusion blades 22 are provided in the internal flow path. Therefore, the exhaust gas 1 in which harmful substances were concentrated at a higher speed toward the central portion,
Through, the turbulent flow is generated, and the turbulent flow is uniformly diffused in the outer cylinder case 14, while the speed is uniformly reduced as a whole.

Then, the exhaust gas 1 diffused and decelerated in the outer cylinder case 14 by passing through the decelerating portion 15 in this manner is supplied to the dispersing portion 16. That is, the exhaust gas 1 is supplied to the dispersion unit 16 after being preliminarily preliminarily diffused and decelerated by the speed reduction unit 15 in preparation for the processing in the dispersion unit 16. Then, the dispersion unit 16 uniformly disperses, rectifies, accelerates, and raises the temperature of the exhaust gas 1. That is, the dispersion portion 16 is composed of a baffle plate 24 in which a plurality of wall holes 23 with a plurality of extending walls 25 are formed. Therefore, the exhaust gas 1 that has been diffused and decelerated in advance by the speed reduction unit 15 passes through the wall holes 23 of the baffle plate 24 of the dispersion unit 16 as described above, so that the central portion of the outer cylinder case 14 is covered. The harmful substances and the like are not concentrated and unevenly distributed, and are uniformly dispersed and rectified into a regular flow, and are uniformly accelerated, and the temperature is raised due to an increase in pressure loss accompanying the acceleration.

After that, the exhaust gas 1 thus dispersed, rectified, accelerated, and raised in temperature by passing through the dispersion unit 16 is supplied to the first purification unit 17. In other words, the exhaust gas 1 is supplied to the first purification unit 17 after being rectified and raised in temperature by the dispersion unit 16 in advance as a pretreatment in preparation for the treatment in the first purification unit 17. First purification unit 17
Attaches an oxidation catalyst to the cell wall 28 of the honeycomb core 27,
The exhaust gas 1 is covered with carbon monoxide CO and hydrocarbons HC in the exhaust gas 1 to oxidize, burn, and reduce and remove the exhaust gas 1.
Because it is rectified and the temperature is raised, the oxidation catalyst
It will function as a whole and reliably. As described above, according to the purifying device 12, the carbon monoxide CO and the hydrocarbon HC in the exhaust gas 1 can be sufficiently oxidized and burned in the first purifying section 17, and this kind of FIG. Compared with the 1st purification | cleaning part 5 of the purification | cleaning apparatus 3 of a prior art example, it can reduce and remove more effectively.

Then, the exhaust gas 1 from which the carbon monoxide CO and the hydrocarbons HC have been reduced and removed by passing through the first purification section 17 in this manner is supplied to the processing section 18. The processing unit 18 includes a straightening portion 32, an accelerating portion 33, and a discharging portion 34 in order from the upstream side in a pipe 31 that connects the front and rear partition plates 30 to each other. Therefore, the inflowing exhaust gas 1 is first rectified by the rectifying portion 32 into a regular flow, and then is rapidly accelerated by the accelerating portion 33 composed of a cylindrical body that is gradually reduced in diameter. As a result, the temperature rises greatly and is heated, and the discharge portion 34
Are uniformly dispersed and discharged into the outer case 14.
As described above, the exhaust gas 1 passes through the processing unit 18 and is greatly heated and heated due to an increase in pressure loss due to local high-speed acceleration, and is disturbed without going straight from upstream to downstream. It is fluidized, uniformly dispersed and discharged, and is supplied to the downstream side in the outer cylinder case 14.

The acceleration portion 3 of the processing unit 18 in the illustrated example
3, the small diameter narrowed portion 35 and a plurality of openings 36 are formed in the middle. Therefore, after the exhaust gas 1 passes through the small-diameter throttle portion 35, it is split into a central main flow that is accelerated at a high speed and a peripheral low-speed auxiliary flow that has passed through the opening 36, and then merges in the vicinity of the discharge portion 34. Therefore, it is discharged to the downstream side. In this manner, the exhaust gas 1 is first slightly accelerated entirely by the small diameter narrowing portion 35, and then, only the central main flow is rapidly accelerated at a high speed, and finally, the exhaust gas 1 is rejoined as a whole. . The exhaust gas 1 has such a small-diameter throttle portion 35 and the opening 3 as described above.
According to 6, firstly, efficient acceleration, pressure loss, and temperature rise can be obtained. Along with this, while maintaining balance in relation to the flow rate, the flow velocity is accelerated within a predetermined range, it is avoided that the flow velocity is accelerated at an excessively high speed, and thus the occurrence of excessive pressure loss is prevented, Excessive burden on the diesel engine 11 (see FIG. 4) upstream of the exhaust pipe 2 is prevented.

By passing through the processing unit 18, the temperature of the exhaust gas 1 is greatly raised and heated, and the exhaust gas 1 is supplied to the downstream side in the outer cylinder case 14. Then, on the basis of the remarkable temperature rise and heating, hydrocarbons HC and carbon particles PM in the exhaust gas 1 (the first purification unit 1
7 and the amount that is not removed by the second purifying unit 19) functions as a reducing agent, thereby reducing and removing the nitrogen oxide NOx in the exhaust gas 1. That is, the hydrocarbons HC and the carbon particles PM in the exhaust gas 1 that have been greatly heated and heated by passing through the processing unit 18 function as a reducing agent, and the vicinity of the second purification unit 19 on the downstream side and the acceleration unit 2 are provided.
In the gas phase near 0 (including the space 26 between them), that is, in the space, nitrogen oxide NO and nitrogen dioxide N in the exhaust gas 1
By reacting with O ₂ , these are harmless nitrogen N, carbon dioxide CO
_2. Reduce, convert, reduce, and remove with water, H ₂ O, etc.
Thus, according to the purifying device 12, the nitrogen oxide NOx in the exhaust gas 1 is reduced, reduced, and removed. Incidentally, this point has been impossible to realize in the above-described conventional purification apparatus 3 of this type shown in FIG.

Then, the exhaust gas 1 which has been heated and greatly heated by passing through the processing section 18 and is uniformly dispersed and discharged is supplied to the second purifying section 19. The second purification unit 19 is composed of a filter 37 having a wire mesh structure to which an oxidation catalyst is adhered and coated, and captures soot carbon particles PM in the exhaust gas 1 to oxidize and combust it.
Then reduce and eliminate it. At that time, since the exhaust gas 1 is uniformly dispersed in the discharge portion 34 of the processing unit 18, the carbon particles PM are trapped by the filter 37 on average and entirely without being unevenly distributed. Become.
Further, since the exhaust gas 1 is greatly heated and heated in the acceleration portion 33 of the processing portion 18, the filter 3
When the oxidation catalyst adheres to and is coated on the wire of 7,
Such an oxidation catalyst will function as a whole and reliably. Further, since the filter 37 having the wire mesh structure is adopted, its heating damage and destruction can be prevented.
As described above, according to the second purifying unit 19 of the purifying device 12, the carbon particles PM in the exhaust gas 1 are more effective than the second purifying unit 6 of the conventional purifying device 3 of this kind shown in FIG. Can be reliably burned, reduced, and eliminated.

Then, the exhaust gas 1 from which the carbon particles PM have been reduced and removed by passing through the second purifying section 19 in this way is the acceleration section 20 at the outlet of the outer case 14.
To be supplied. The accelerating unit 20 is a short cylinder whose diameter is gradually reduced to a small diameter, and accelerates the exhaust gas 1. Therefore, in addition to the temperature rise and heating in the processing unit 18, the exhaust gas 1 is further raised in temperature due to the increase in pressure loss due to the acceleration in the accelerating unit 20. Hydrocarbons HC and carbon particles PM that are unburned components that have not been removed by the first purification unit 17 and the second purification unit 19,
In the vicinity of the accelerating portion 15 (including the space 26 before the accelerating portion), combustion, reduction, and removal are performed. As described above, according to the purifier 12, the hydrocarbons HC and the carbon particles PM in the exhaust gas 1 are more reliably burned, reduced, and removed as compared with the purifier 3 of the conventional example of this kind shown in FIG. Be punished.

Then, the exhaust gas 1 is purified by the purifying device 12
Is discharged from the accelerating section 20 at the outlet of the outer cylinder case 14 to the exhaust pipe 2 on the downstream side. Exhaust gas 1 is stepped by such a purification device 12 ,.
, By tracing carbon monoxide CO, hydrocarbons HC, carbon particles PM, nitrogen oxides NOx
Hazardous substances such as are reduced and removed, and then discharged.

[0038] First, since the exhaust gas 1 is accelerated and sucked by the accelerating section 20 at the outlet, the ash of burned fuel contained in the exhaust gas 1 and the like are also contained in the outer cylinder of the purifier 12. It will be discharged without adhering to and remaining in the case 14. On the other hand, in the above-described conventional purification apparatus 3 of FIG. 5 described above, adhesion of ash or the like to the inside of the outer cylinder case 4,
Residue was pointed out. Further, the carbon particles PM trapped / accumulated in the second purification unit 19 by the acceleration and suction by the acceleration unit 20 at the outlet are appropriately discharged without being excessively trapped / accumulated to cause clogging. As a result, the second purifying unit 19 always functions and operates normally. Secondly, at the time of upshift acceleration of the diesel engine 11, the flow velocity in the exhaust gas 1 supplied through the exhaust pipe 2 is accelerated, and the amount of harmful substances in the exhaust gas 1 also increases, In this case, proportionally, the acceleration, temperature rise and heating in the processing section 18 are further increased, so that the reduction and removal of the above-mentioned harmful substances are further promoted and the harmful substances are surely purified.

[0039]

<Characteristics of the Invention> As described above, the exhaust gas purifying apparatus according to the invention has the following features.
Exhaust gas has a predetermined deceleration section, dispersion section, first purification section,
The second purifying section, the accelerating section and the like are arranged in this order. In the second invention, a predetermined first purifying unit, a treating unit, a second purifying unit, an accelerating unit, and the like are arranged in order for the exhaust gas, and the treating unit is provided with a rectifying portion, an accelerating portion, and a discharging portion in order. It is characterized by being. Therefore, the present invention exhibits the following effects.

<< Regarding the First Effect >> First, it is possible to effectively reduce and remove harmful substances such as carbon monoxide and hydrocarbons. That is, in the purifying apparatus of the first invention, the exhaust gas is uniformly dispersed by passing through the speed reducing section and the dispersing section, and the temperature thereof is increased with acceleration, and the exhaust gas is supplied to the first purifying section. Therefore, in the first purification section, the oxidation catalyst comes to function as a whole and reliably,
Compared to the above-mentioned conventional example of this kind, carbon monoxide and hydrocarbons in the exhaust gas are sufficiently oxidized and burned, and more effectively reduced and removed. Further, in the purifying apparatus of the second aspect of the invention, the exhaust gas is accelerated at a high speed by passing through the processing section, greatly heated and heated, and supplied to the downstream side in the outer cylinder case. Therefore, the hydrocarbons that have not been removed by the first purification unit are burned to be reduced and removed in the downstream side, for example, near the acceleration unit. Thus, the hydrocarbons in the exhaust gas can be more effectively reduced and removed as compared with the above-mentioned conventional example of this kind.

<Second Effect> Secondly, soot, ie, carbon particles, which are harmful substances, can be surely reduced and removed. That is, in the purifying apparatus of the second aspect of the invention, the exhaust gas is accelerated at a high speed by passing through the processing section to be greatly increased in temperature and heated, and is evenly dispersed, and is supplied to the downstream side. Therefore, in the second purification section,
When the carbon particles are wholly captured and the oxidation catalyst is attached and coated, the oxidation catalyst can function as a whole and reliably. Further, since the second purifying section has the wire mesh structure, it is not damaged by heating or destroyed. In this way, the carbon particles in the exhaust gas can be more reliably reduced and removed by combustion in the downstream second purification section and further in the vicinity of the accelerating section as compared with the above-described conventional example of this type. Become.

<< Third Effect >> Thirdly, it becomes possible to reduce and remove nitrogen oxides which are harmful substances. That is,
In the purifying apparatus of the second invention, the exhaust gas is accelerated at a high speed by passing through the processing section and has a large temperature rise,
It is heated and supplied to the downstream side. Therefore, based on such a remarkable temperature rise and heating, hydrocarbons and carbon particles in the exhaust gas function as a reducing agent, and thus nitrogen oxides in the exhaust gas can be reduced and removed. As described above, the effects of the present invention are remarkably large, such that all the problems existing in this type of conventional example are solved.

[Brief description of drawings]

FIG. 1 is a side cross-sectional explanatory view for explaining an embodiment of the invention for an exhaust gas purifying apparatus according to the present invention.

2 is a view for explaining the embodiment of the present invention, and (1) is a sectional view taken along line I-I of FIG.
(2) FIG. 2 is a front view taken along the line II-II of FIG.

FIG. 3 is a front view of the baffle plate of the dispersion unit, which is used for the description of the embodiment of the present invention, in which (1) is an example thereof and (2) is another example, (3) The figure shows still another example.

FIG. 4 is a side view of the entire exhaust system, which is used for explaining the embodiment of the present invention.

FIG. 5 is a side cross sectional explanatory view for explaining an exhaust gas purifying apparatus according to a conventional example of this kind.

[Explanation of symbols]

1 exhaust gas 2 exhaust pipe 3 Purification device (of this type of conventional example) 4 Outer cylinder case (conventional example of this type) 5 1st purification part (of this kind of conventional example) 6 2nd purification part (of this kind of conventional example) 7 Honeycomb core (conventional example of this type) 8 cell walls 9 filter (this type of conventional example) 10 hole wall 11 diesel engine 12 Purification device (of the present invention) 13 Fuel tank 14 Outer case (of the present invention) 15 Decelerator 16 dispersion unit 17 First Purification Section (of the present invention) 18 Processor 19 Second purification section (of the present invention) 20 Accelerator 21 Gap 22 diffusion wings 23 Wall hole 24 baffle plate 25 Extension wall 26 intervals 27 Honeycomb core (of the present invention) 28 cell walls 30 dividers 29 Midway space 31 pipes 32 Rectification part 33 Acceleration part 34 Discharge part 35 diameter small throttle 36 openings 37 Filter (of the present invention)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F01N 3/02 321 F01N 3/02 321B 321D 3/08 Z 3/08 B01D 46/42 B // B01D 46 / 42 53/36 103Z (72) Inventor Motohiro Yano 1-2-1 Otemachi, Chiyoda-ku, Tokyo Mitsui & Co., Ltd. (72) Inventor Yuji Shiro 1-2-1 Otemachi, Chiyoda-ku, Tokyo No. Mitsui & Co., Ltd. (72) Inventor Koichi Sugawara 1-2-1, Otemachi, Chiyoda-ku, Tokyo Mitsui & Co., Ltd. (72) Takashi Kashima 2776-11 Takenoshita, Koyama-cho, Sunto-gun, Shizuoka FTF Powercraft Co., Ltd. Shizuoka Factory F-term (reference) 3G090 AA03 BA01 DB06 EA02 EA03 EA05 3G091 AA02 AA04 AA05 AA06 AA10 AA18 AB02 AB04 AB13 AB16 BA00 BA 04 BA14 BA15 BA19 CA27 FB10 GB01W GB06W HA15 HA47 HB06 4D019 AA01 BA02 BB02 CB04 CB09 4D048 AA13 AA18 AB01 BA23X BA28X BA30X BA35X BA41X BB02 CA01 CA07 CC23 CC24 CD05 CD08 4D058 JB08 JB24 MA41 SA41

Claims (15)

[Claims] 1. A purifying device provided in an exhaust pipe for reducing and removing harmful substances contained in exhaust gas, the deceleration portion, the dispersion portion, and the first purifying portion of the exhaust gas comprising: A device for purifying exhaust gas, characterized in that it is provided in order. 2. The exhaust gas purifying apparatus according to claim 1, wherein the speed reducing portion, the dispersing portion, and the first purifying portion are arranged in this order from the upstream side in an outer cylinder case having a diameter larger than that of the exhaust pipe. The deceleration portion is made of a short cylinder whose diameter gradually widens to slow down the exhaust gas, and the dispersion portion has a baffle plate in which a large number of wall holes are formed. The exhaust gas is uniformly dispersed, rectified, accelerated, and raised in temperature, and the first purification unit is formed by adhering and coating an oxidation catalyst on the cell wall of the honeycomb core, which is a harmful substance in the exhaust gas. An exhaust gas purification device characterized by oxidizing, burning, and reducing and removing carbon monoxide and hydrocarbons. 3. The exhaust gas purifying apparatus according to claim 2, wherein the speed reducer is disposed at an inlet of the outer cylinder case, and a gap exists between an outer peripheral surface and the outer cylinder case. In addition, the exhaust gas purifying device is characterized in that a diffusion blade is provided in the internal flow path. 4. The exhaust gas purifying apparatus according to claim 2, wherein each of the wall holes of the baffle plate of the dispersion section is
An exhaust gas purifying device, characterized in that the exhaust gas purifying device is formed by forming holes in a regular positional relationship as a whole and is provided with respective extending walls. 5. The exhaust gas purifying apparatus according to claim 4, wherein the dispersion portion includes a plurality of the baffle plates, and the positions of the wall holes are different between the baffle plates. The exhaust gas purifying device is characterized by 6. The exhaust gas purifying apparatus according to claim 2, wherein a second purifying unit is disposed in the outer cylinder case downstream of the first purifying unit, and the second purifying unit is provided. The part is composed of a wire mesh structure filter in which metal wires are assembled in a mesh shape, and captures soot, that is, carbon particles, which are harmful substances in the exhaust gas, and oxidizes, burns, reduces, and removes them. Exhaust gas purification device characterized by: 7. The exhaust gas purifying apparatus according to claim 2, wherein an accelerating portion is provided at the outlet of the outer cylinder case, and the accelerating portion has a gradually reduced diameter. An exhaust gas purifying device, characterized in that the exhaust gas is accelerated, and the exhaust gas is accelerated. 8. A purifying device which is interposed in an exhaust pipe to reduce and remove harmful substances contained in the exhaust gas, wherein the exhaust gas is contained in an outer cylinder case having a diameter larger than the exhaust pipe. An exhaust gas purifying device, characterized in that it comprises a rectifying part, an accelerating part, and a discharging part in this order. 9. The exhaust gas purifying apparatus according to claim 8, wherein the processing section has a partition plate that divides the inside of the outer cylinder case into front and rear through an intermediate space, and has a diameter smaller than that of the exhaust pipe. A pipe connecting the front and rear partition plates, and a rectifying portion, an accelerating portion, and a discharging portion, which are sequentially arranged on the pipe from the upstream side,
And accelerating the exhaust gas, increasing the temperature, and uniformly discharging the exhaust gas,
A characteristic exhaust gas purification device. 10. The exhaust gas purifying apparatus according to claim 9, wherein the rectifying portion is made of a honeycomb core and rectifies the inflowing exhaust gas, and the accelerating portion has a gradually reduced diameter. The exhaust gas is made up of an elbow, and the exhaust gas is uniformly dispersed and discharged toward the inside of the outer cylinder case. Gas purification device. 11. The exhaust gas purifying apparatus according to claim 10, wherein the acceleration portion has a small-diameter throttle portion formed in the middle thereof and a plurality of openings formed downstream from the small-diameter throttle portion. The exhaust gas is divided into a central main flow that is accelerated at high speed and an outer peripheral sub-flow that has passed through the opening, and then joins in the vicinity of the exhaust portion. Gas purification device. 12. The exhaust gas purifying apparatus according to claim 10, wherein a first purifying unit is disposed in the outer cylinder case upstream of the processing unit, and the first purifying unit is An exhaust gas, characterized in that an oxidation catalyst is adhered to and coated on the cell wall of the honeycomb core, and carbon monoxide and hydrocarbon which are harmful substances in the exhaust gas are oxidized, burned, reduced and removed. Purification equipment. 13. The exhaust gas purifying apparatus according to claim 10, wherein hydrocarbons and soot carbon particles in the exhaust gas are present in a gas phase in the outer cylinder case downstream of the processing section. A device for purifying exhaust gas, which functions as a reducing agent due to temperature rise and heating, and reduces and removes nitrogen oxides, which are harmful substances in the exhaust gas, by reduction. 14. The exhaust gas purifying apparatus according to claim 10, wherein a second purifying unit is disposed in the outer cylinder case downstream of the processing unit, and the second purifying unit is A wire mesh structure filter in which metal wires are assembled in a mesh shape, and captures soot, that is, carbon particles, which are harmful substances in the exhaust gas, and oxidizes, burns, reduces, and removes them. Exhaust gas purification device. 15. The exhaust gas purifying apparatus according to claim 10, wherein an accelerating portion is provided at an outlet of the outer cylinder case, and the accelerating portion has a gradually reduced diameter. An exhaust gas purifying device, characterized in that the exhaust gas is accelerated, and the exhaust gas is accelerated.