CN111183275A - Exhaust gas purification device for internal combustion engine - Google Patents
Exhaust gas purification device for internal combustion engine Download PDFInfo
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- CN111183275A CN111183275A CN201880064380.1A CN201880064380A CN111183275A CN 111183275 A CN111183275 A CN 111183275A CN 201880064380 A CN201880064380 A CN 201880064380A CN 111183275 A CN111183275 A CN 111183275A
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- upstream
- downstream
- partition plate
- exhaust gas
- pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
An exhaust gas purification device of an internal combustion engine includes: an exhaust passage through which exhaust gas of the internal combustion engine flows; a catalyst disposed in the exhaust passage; an injection valve (14) provided on an upstream side of the catalyst for injecting the reducing agent into the exhaust passage; an upstream-side partition plate (31A) and a downstream-side partition plate (31B) that are provided apart from each other inside an exhaust passage (10) that is located on the downstream side of the injection valve and on the upstream side of the catalyst; an upstream side through hole (33A) and a downstream side through hole (33B) which are respectively arranged in the partition plates (31A, 31B); an upstream pipe (32A) provided in the upstream partition plate and communicating with the upstream through hole; and a downstream pipe (32B) provided in the downstream partition plate and communicating with the downstream through hole. The outlet section (34) of the upstream pipe and the inlet section (35) of the downstream pipe are arranged in a non-coaxial state.
Description
Technical Field
The present disclosure relates to an exhaust gas purification apparatus for an internal combustion engine, and particularly to an exhaust gas purification apparatus mainly suitable for a diesel engine.
Background
In the exhaust passage of diesel engine, a catalyst for reducing and removing NO in exhaust gas is providedx(Nitrogen oxide) selective reduction type NOxA catalyst. In NOxAn injection valve for injecting urea water is provided upstream of the catalyst. NOxCatalytic reduction of NOxWith ammonia NH obtained by hydrolysis of urea water3React to remove NO from the exhaustxReduction to nitrogen N2。
Prior art documents
Patent document
Patent document 1: international publication No. 2010/053033
Patent document 2: japanese patent laid-open No. 2008-144644
Patent document 3: japanese patent laid-open publication No. 2006-77576
Disclosure of Invention
[ problems to be solved by the invention ]
To make NOxThe catalyst operates efficiently, and it is desirable to promote hydrolysis of the urea aqueous solution and maintain the ammonia production amount per unit volume of the urea aqueous solution, that is, the ammonia production efficiency, as high as possible. In order to promote hydrolysis of the urea water, it is preferable to promote mixing of the urea water and the exhaust gas injected into the exhaust passage as much as possible.
Therefore, the present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide an exhaust gas purification apparatus of an internal combustion engine, which can promote mixing of injected urea water and exhaust gas.
[ means for solving the problems ]
According to an aspect of the present disclosure, there is provided an exhaust gas purification apparatus of an internal combustion engine, the exhaust gas purification apparatus including:
an exhaust passage through which exhaust gas of the internal combustion engine flows;
a catalyst disposed in the exhaust passage;
an injection valve provided on an upstream side of the catalyst for injecting a reducing agent into the exhaust passage;
an upstream-side partition plate and a downstream-side partition plate that are provided apart from each other inside the exhaust passage on a downstream side of the injection valve and on an upstream side of the catalyst;
an upstream-side through hole and a downstream-side through hole provided in the upstream-side partition plate and the downstream-side partition plate, respectively;
an upstream side pipe provided in the upstream side partition plate and communicating with the upstream side through hole;
a downstream pipe provided in the downstream partition plate and communicating with the downstream through hole,
the outlet portion of the upstream-side pipe and the inlet portion of the downstream-side pipe are disposed in a non-coaxial state with each other.
Preferably, the upstream-side tube and the downstream-side tube protrude into a space between the upstream-side partition plate and the downstream-side partition plate.
Preferably, the outlet portion of the upstream-side tube and the inlet portion of the downstream-side tube overlap each other in upstream and downstream directions.
Preferably, the upstream-side tube and the downstream-side tube are in contact with each other.
Preferably, at least one of the upstream-side separation plate and the downstream-side separation plate is inclined with respect to a direction perpendicular to a central axis of the exhaust passage.
[ Effect of the invention ]
According to the present disclosure, mixing of the injected urea water and the exhaust gas may be promoted.
Drawings
Fig. 1 is a longitudinal sectional side view showing the overall structure of an exhaust gas purification device according to a first embodiment of the present disclosure.
Fig. 2 is a longitudinal sectional rear view of the exhaust gas purifying device, and is a sectional view taken along line II-II of fig. 1.
Fig. 3 is a longitudinal sectional front view of the exhaust gas purifying device, and is a sectional view taken along line III-III of fig. 1.
Fig. 4 is a longitudinal sectional side view showing the internal configuration of the second passage.
Fig. 5 is a sectional view taken along line V-V of fig. 4.
Fig. 6 is a longitudinal sectional side view showing the internal configuration of the second passage in the second embodiment.
Fig. 7 is a sectional view taken along line VII-VII of fig. 6.
Fig. 8 is a longitudinal sectional side view showing the internal configuration of the second passage in the third embodiment.
Fig. 9 is a sectional view taken along line IX-IX of fig. 8.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In addition, note that the present disclosure is not limited to the following embodiments.
[ first embodiment ]
Fig. 1 to 3 show the overall structure of an exhaust gas purification apparatus according to a first embodiment of the present disclosure. Fig. 1 is a longitudinal sectional side view (a sectional view taken along line I-I of fig. 2), fig. 2 is a longitudinal sectional rear view (a sectional view taken along line II-II of fig. 1), and fig. 3 is a longitudinal sectional front view (a sectional view taken along line III-III of fig. 1). For convenience, the three orthogonal axes are oriented as shown, i.e., front, rear, left, right, up and down. It should be noted, however, that these directions are determined merely for convenience of explanation in connection with the illustrated configuration.
An internal combustion engine (not shown, also referred to as an engine) to which the exhaust gas purification apparatus is applied is a diesel engine mounted on a vehicle. The vehicle (not shown) is a large vehicle such as a truck. However, the type and use of the vehicle and the internal combustion engine are not limited, and the vehicle may be a small vehicle such as a passenger car, and the engine may be a gasoline engine, for example.
As shown in the drawing, the exhaust gas purification apparatus 1 includes a sealed box-shaped casing 2, and the casing 2 compactly houses a plurality of members (catalysts and the like) described later. The housing 2 of the present embodiment has a rectangular parallelepiped shape. A device inlet pipe 3 for introducing exhaust gas G of the engine into the case 2 and a device outlet pipe 4 for discharging the exhaust gas G from the case 2 are attached to the rear end wall 2R of the case 2. However, the positions of the apparatus inlet pipe 3 and the apparatus outlet pipe 4 may be arbitrarily set.
A plurality of metal (stainless steel in the present embodiment) pipes and plates are attached by welding or the like in the housing 2 to define an exhaust passage 5 through which the exhaust gas G flows, by dividing an appropriate space. Here, the "exhaust passage" refers to an arbitrary space through which the exhaust gas G flows, and its shape is arbitrary. It may be tubular or chamber-shaped. The exhaust passage 5 is configured to reciprocate the exhaust gas G in the front-rear direction a plurality of times.
A front partition 6 and a rear partition 7 partitioning the inside of the casing 2 in the front and rear directions are provided in the casing 2. A front end chamber 8F is defined between the front side partition 6 and the front end wall 2F of the housing 2. A rear end chamber 8R is defined between the rear side partition 7 and the rear end wall 2R of the housing 2. An intermediate chamber 8M is defined between the front-side partition 6 and the rear-side partition 7.
Hereinafter, the main flow of the exhaust gas G inside the housing 2 will be schematically described. This main flow is shown by the arrows in fig. 1 to 3.
The exhaust gas flowing forward in the apparatus inlet pipe 3 directly travels straight in the first passage 9 disposed on the lower left side of the casing 2 and extending in the front-rear direction, and at this time, passes through the first oxidation catalyst 21 and the filter 22 in this order. Then, the exhaust gas enters the second passage 10 as a mixing passage disposed at the center of the housing 2 through the supply passage 19 in the supply pipe 19P disposed in the front end chamber 8F. At this time, the exhaust gas is turned back from the front to the back. Then, the exhaust gas flows from the front to the rear in the second passage 10, enters the rear end chamber 8R, branches in two directions as shown in fig. 2, and enters a third passage 11 disposed on the lower right side of the housing 2 and a fourth passage 12 disposed on the upper left side of the housing 2. At this time, the exhaust gas is turned back from the rear toward the front.
The exhaust gas flows from the rear to the front in the third and fourth passages 11, 12, and passes NO in this orderxCatalyst 23 and second oxidation catalyst 24. Thereafter, the exhaust gas enters the front end chamber 8F and, as shown in fig. 3, is collected in the fifth passage 13 disposed on the upper right side of the housing 2. At this time, the exhaust gas is turned back from the front to the back. Thereafter, the exhaust gas flows from the front to the rear in the fifth passage 13, and as such, directly enters the apparatus outlet pipe 4 and is discharged.
Thus, the exhaust passage 5 includes the first passage 9, the second passage 10, the third passage 11, the fourth passage 12, the fifth passage 13, the supply passage 19, the front end chamber 8F, and the rear end chamber 8R.
An injection valve 14 for injecting urea water as a reducing agent is provided at an upstream end position of the second passage 10. The injection valve 10 is disposed coaxially with the second passage 10 toward the rear, and injects the urea water in a spray form toward the rear in the axial direction of the second passage 10.
In the exhaust passage 5, four kinds of aftertreatment components, i.e., a first oxidation catalyst 21, a filter 22, and a selective reduction type NO, are provided in series in this order from the upstream sidexCatalyst 23 and second oxidation catalyst 24.
The first oxidation catalyst 21 oxidizes and purifies unburned components (hydrocarbons HC and carbon monoxide CO) in the exhaust gas, and at this time heats and raises the temperature of the exhaust gas by reaction heat.
The Filter 22 is a so-called Diesel Particulate Filter (DPF) or a Catalyzed Soot Filter (CSF), which is a continuously regenerating Filter carrying a catalyst. The filter 22 is of a wall-flow type, and collects particulate matter (hereinafter, referred to as PM: particulate matter) contained in exhaust gas, and continuously oxidizes the collected PM by a catalytic reaction to burn and remove the PM.
Selective reduction type NOxCatalyst (SCR) 23 Ammonia NH obtained by hydrolysis of Urea Water3With NOxReact to remove NO from the exhaustxReduction to nitrogen N2。
The second oxidation catalyst 24, also referred to as an ammonia slip oxidation catalyst, oxidizes and removes NO fromxThe catalyst 23 discharges (misses) the excess ammonia.
In the present embodiment, two sets of NO are provided in parallel with each other in the third passage 11 and the fourth passage 12xA combination of catalyst 23 and a second oxidation catalyst 24. Further, as shown in FIG. 1, in each combination, NOxThe catalyst 23 is formed on the entire upstream side part of the upstream side carrier 23A and the downstream side carrier 23B, and the second oxidation catalyst 24 is formed in a zone coating on the downstream side part of the downstream side carrier 23B. However, the supports of the two catalysts may be separated.
The first to fifth passages 9 to 13 and the supply passage 19 are defined by first to fifth passage pipes 9P to 13P and a supply passage pipe 19P. In the present embodiment, the first to fourth passages 9 to 12 are linear and have a circular cross section, and the supply passage 19 is linear and has an elliptical cross section. In addition, for example, as shown in fig. 2, a fifth passage 13 is formed linearly at the upper right corner position of the housing 2. Each tube corresponding to each channel also has the same shape. However, the shape of each passage and each tube may be changed as appropriate.
In the direction of flow of the exhaust gas, the first passage pipe 9P extends from the rear end wall 2R to the front end wall 2F, the second passage pipe 10P extends from the front end wall 2F to the rear side bulkhead 7, the third passage pipe 11P and the fourth passage pipe 12P extend from the rear side bulkhead 7 to the front side bulkhead 6, and the fifth passage pipe 13P extends from the front side bulkhead 6 to the rear end wall 2R. Therefore, the interior of the front end chamber 8F is divided into a portion of the first passage 9, a portion of the second passage 10, a portion of the supply passage 19, and other portions. In addition, the inside of the rear end chamber 8R is divided into a portion of the first passage 9, a portion of the fifth passage 13, and other portions.
Next, the internal configuration of the second passage 10 is explained with reference to fig. 4.
As described above, the injection valve 14 for injecting the urea water U rearward is provided at the upstream end of the second passage 10. Also, a supply passage 19 is connected to the lower left side surface of the second passage 10 in the front end chamber 8F, and the exhaust gas G is introduced into the second passage 10 from this supply passage 19.
The urea water spray and the exhaust gas G are gradually mixed as they proceed toward the rear downstream side in the second passage 10. In the present embodiment, the following configuration is adopted to facilitate such mixing.
Inside the second passage 10, an upstream-side partition plate 31A and a downstream-side partition plate 31B that are provided apart from each other in the upstream direction and the downstream direction, an upstream-side tube 32A provided on the upstream-side partition plate 31A, and a downstream-side tube 32B provided on the downstream-side partition plate 31B are arranged. The upstream-side partition plate 31A and the downstream-side partition plate 31B are provided with an upstream-side through hole 33A and a downstream-side through hole 33B, respectively, and the upstream-side tube 32A and the downstream-side tube 32B communicate with the upstream-side through hole 33A and the downstream-side through hole 33B, respectively, and are connected to the upstream-side through hole 33A and the downstream-side through hole 33B. Specifically, the outlet portion 34 of the upstream-side tube 32A and the inlet portion 35 of the downstream-side tube 31B are arranged non-coaxially with each other. In the figure, the central axis of the outlet portion 34 of the upstream pipe 32A is shown as C1, and the central axis of the inlet portion 35 of the downstream pipe 31B is shown as C2.
the upstream-side partition plate 31A and the downstream-side partition plate 31B partition the inside of the second passage 10 in the front-rear direction (i.e., the upstream side and the downstream side), respectively, the upstream-side partition plate 31A and the downstream-side partition plate 31B are fixed to the inner peripheral surface of the second passage pipe 10P formed of a plate material by welding or the like, in the case of the present embodiment, the upstream-side partition plate 31A and the downstream-side partition plate 31B are inclined in the same direction at inclination angles α 1 and α 2 with respect to the direction perpendicular to the central axis C of the second passage 10.
the upstream-side partition plate 31A is inclined such that the upper side provided with the upstream-side through holes 33A and the upstream-side tubes 32A is located rearward with respect to the lower side, and the downstream-side partition plate 31B is inclined such that the lower side provided with the downstream-side through holes 33B and the downstream-side tubes 32B is located forward with respect to the upper side.
the upstream-side through holes 33A and the downstream-side through holes 33B are formed to penetrate the upstream-side partition plate 31A and the downstream-side partition plate 31B in the plate thickness direction, the upstream-side through holes 33A and the downstream-side through holes 33B are inclined parallel to the central axis C of the second passage 10, that is, at angles equal to the inclination angles α 1, α 2 with respect to the direction perpendicular to the plate surfaces of the upstream-side partition plate 31A and the downstream-side partition plate 31B, as shown in FIG. 5, the upstream-side through holes 33A and the downstream-side through holes 33B are offset in the up-down direction by equal distances L1, L2 with respect to the central axis C of the second passage 10.
In the present embodiment, each of the upstream-side tube 32A and the downstream-side tube 32B is formed of a tube having a circular cross section and a straight tube shape, and is configured to protrude into the space 36 between the upstream-side partition plate 31A and the downstream-side partition plate 31B. The upstream side tube 32A and the downstream side tube 32B are coaxially connected to the upstream side through hole 33A and the downstream side through hole 33B. Therefore, the upstream side pipe 32A and the downstream side pipe 32B are also arranged parallel to the central axis C of the second passage 10, and are arranged offset by equal distances L1, L2 in the up-down direction with respect to the central axis C of the second passage 10. However, similarly to the above, the upstream side tube 32A and the downstream side tube 32B may be arranged in an arbitrary direction, and in addition, the offset distance may be set arbitrarily.
The inner and outer diameters of the upstream side tube 32A and the downstream side tube 32B are constant. Their inner diameters are equal to the diameters of the upstream side through hole 33A and the downstream side through hole 33B, respectively, so that no step occurs at the joint between the pipe and the through holes. The inlet end of the upstream-side tube 32A and the outlet end of the downstream-side tube 32B are obliquely cut and fixed to the surfaces in the space 36 of the upstream-side partition plate 31A and the downstream-side partition plate 31B by welding or the like. Therefore, the upstream side tube 32A and the downstream side tube 32B extend only within the space 36 so as to oppose each other from the upstream side partition plate 31A and the downstream side partition plate 31B. The upstream pipe 32A extends rearward and downstream from the upstream partition plate 31A, and the downstream pipe 32B extends forward and upstream from the downstream partition plate 31B. However, as a modification, a portion of at least one of the upstream-side tube 32A and the downstream-side tube 32B may extend to the outside of the space 36.
In the case of the present embodiment, the outlet portion 34 of the upstream side tube 32A and the inlet portion 35 of the downstream side tube 32B overlap each other in the front-rear direction (i.e., in the upstream/downstream direction). The overlap length is shown as L. However, such overlap may not be provided.
In this way, in the present embodiment, the straight-tube upstream-side tube 32A and the straight-tube downstream-side tube 32B extend from the upstream-side partition plate 31A and the downstream-side partition plate 31B in parallel to each other and in a non-coaxial state.
The flow of the exhaust gas G in the second passage 10 is as follows. As shown by the arrows in fig. 4, the exhaust gas G introduced from the supply passage 19 into the second passage 10 enters the upstream side tube 32A through the upstream side penetration holes 33A. At this time, since the upstream side partition plate 31A is inclined so that the upstream side through holes 33A are located rearward, the exhaust gas G flows along the front surface portion of the upstream side partition plate 31A, and can be smoothly guided to the upstream side through holes 33A.
After the exhaust gas G flows through the upstream side pipe 32A, it is discharged rearward in the direction of the outlet portion 34. Then, it turns forward and travels toward the inlet portion 35 of the downstream side tube 32B. When entering the inlet portion 35 of the downstream side tube 32B, the exhaust gas G turns rearward and then enters the inlet portion 35 rearward in the direction of the inlet portion 35. Thus, the exhaust gas G turns twice during exiting the outlet portion 34 to entering the inlet portion 35.
After flowing through the downstream side pipe 32B, the exhaust gas G is discharged from the downstream side pipe 32B and the downstream side through hole 33B rearward in the direction of the outlet portion 38. Then, the exhaust gas G flows through the second passage 10 and into the rear end chamber 8R. Since the downstream side partition plate 31B is inclined so that the downstream side through hole 33B is positioned forward, the exhaust gas G immediately after being discharged from the downstream side through hole 33B can flow along the rear surface portion of the downstream side partition plate 31B, and can be smoothly discharged from the downstream side through hole 33B.
In this way, in the present embodiment, since the outlet portion 34 of the upstream side pipe 32A and the inlet portion 35 of the downstream side pipe 31B are arranged in a non-coaxial state with each other, it is possible to avoid the flow of the exhaust gas G discharged from the outlet portion 34 of the upstream side pipe 32A from directly entering the inlet portion 35 of the downstream side pipe 31B. Also, the flow of the exhaust gas G may curve between the outlet portion 34 of the upstream-side pipe 32A to the inlet portion 35 of the downstream-side pipe 31B, and the curve may promote mixing of the injected urea water and the exhaust gas G. In addition, this promotes heating of the urea water by the exhaust gas, promotes hydrolysis of the urea water, improves the efficiency of ammonia production, and enables NO to be generatedxThe catalyst operates efficiently. Further, the exhaust gas purification performance can be improved.
In addition, in the present embodiment, since the upstream side pipe 32A and the downstream side pipe 32B protrude into the space 36 between the upstream side partition plate 31A and the downstream side partition plate 31B, the flow of the exhaust gas G can be bent relatively complicatedly in such a narrow space 36, and the mixing of the urea water and the exhaust gas G can be further promoted.
In addition, in the present embodiment, since the outlet portion 34 of the upstream side pipe 32A and the inlet portion 35 of the downstream side pipe 32B overlap each other in the upstream and downstream directions, the above-described flow of twice-turn can be reliably realized, and therefore, the mixing of the urea water and the exhaust gas G can be further promoted. In addition, the substantial passage length is increased within the limited front-rear length range (space 36), and the mixing passage length of the urea water and the exhaust gas G can be substantially increased. Therefore, the space can be effectively utilized.
In addition, in the present embodiment, since the upstream-side partition plate 31A and the downstream-side partition plate 31B are inclined as described above, the exhaust gas G is smoothly guided to the upstream-side through holes 33A, and the exhaust gas G can be smoothly discharged from the downstream-side through holes 33B. In addition, retention of urea water on the surface of the partition plate is suppressed, and generation of deposits due to the retention can be suppressed.
Further, since the upstream-side partition plate 31A and the downstream-side partition plate 31B and the upstream-side pipe 32A and the downstream-side pipe 32B are often exposed to high-temperature exhaust gas, they can also be used as a heat storage body that stores heat of the exhaust gas. Since these heat storage bodies, which store heat and reach a high temperature, are in contact with the urea water (or the mixture of the urea water and the exhaust gas), the urea water can be heated and hydrolysis thereof can be promoted.
In particular, in the present embodiment, since the upstream-side tubes 32A and the downstream-side tubes 32B are provided, the surface area of the heat storage body and the contact area of the heat storage body and the urea water can be increased, and heating and hydrolysis of the urea water can be promoted, as compared with the case where only the upstream-side partition plate 31A and the downstream-side partition plate 31B are provided.
The exhaust gas purification apparatus 1 of the present embodiment forms an exhaust passage 5 that is repeatedly folded back in a sealed box-shaped casing 2, and a plurality of aftertreatment members (catalysts and the like) are arranged in the exhaust passage 5, so the exhaust gas purification apparatus 1 also functions as a muffler (muffler). Therefore, a muffler does not need to be separately provided, and the manufacturing cost can be reduced.
[ second embodiment ]
Next, a second embodiment of the present disclosure is explained. In the drawings, the same reference numerals are given to the same portions as those of the first embodiment, and the description thereof will be omitted, and the differences from the first embodiment will be mainly described below.
As shown in fig. 6 and 7, the present embodiment differs from the first embodiment in the structure of the outlet portion 34 of the upstream side tube 32A. That is, in the first embodiment, the upstream pipe 32A is straight as a whole, and the outlet portion 34 thereof is also straight. In contrast, in the present embodiment, the portion of the upstream-side tube 32A other than the outlet portion 34 is straight, but the outlet portion 34 is curved, being a curved tube shape. Therefore, the outlet portion 34 of the upstream-side tube 32A and the inlet portion 35 of the downstream-side tube 31B are arranged in a state of being non-parallel and non-coaxial with each other.
in the present embodiment, the outlet portion 34 is bent in a direction avoiding the downstream pipe 31B, and is bent in a direction obliquely downward to the rear and to the left, however, the direction is not limited thereto, the outlet portion 34 is bent outward in the radial direction thereof with respect to the central axis C3 of the inlet portion 37, as in the present embodiment, it is preferable that the bending angle α 3, which is the angle between the central axis C3 of the inlet portion 37 and the central axis C2 of the outlet portion 34, is an obtuse angle, whereby the bending becomes gentle, and the resistance to the flow of the exhaust gas G can be reduced, and further, the central axis C2 of the outlet portion 34 is defined by the central axis of the position of the outlet end (pipe end) of the outlet portion.
In the present embodiment, the flow of the exhaust gas G is as follows. As shown by the arrows in fig. 6 and 7, the exhaust gas G discharged obliquely to the left and rearward from the outlet portion 34 of the upstream-side pipe 32A turns around along the inner peripheral surface of the second passage pipe 10P while turning forward, and then turns rearward and enters the inlet portion 35 of the downstream-side pipe 32B.
Therefore, in addition to the flow that is twice diverted in the front-rear direction, the flow in the swirling direction can be increased, and the mixing of the urea water and the exhaust gas G can be further promoted. Moreover, heating and hydrolysis of the urea water can be further promoted.
Other functions and effects are the same as those in the first embodiment. In a modification of the present embodiment, the inlet portion 35 of the downstream pipe 32B may be bent into a curved pipe shape.
[ third embodiment ]
Next, a third embodiment of the present disclosure is explained.
As shown in fig. 8 and 9, the present embodiment is mainly different from the first embodiment in the inclination direction of the downstream side partition plate 31B, the direction of the upstream side pipe 32A, and the position and direction of the downstream side pipe 32B.
that is, the downstream-side partition plate 31B is inclined in the opposite direction to the first embodiment, and the downstream-side partition plate 31B is inclined such that the upper side provided with the downstream-side through hole 33B and the downstream-side pipe 32B is located forward with respect to the lower side, however, the magnitude of the inclination angle is α 2, which is the same as the first embodiment, and therefore, the upstream-side partition plate 31A and the downstream-side partition plate 31B are arranged mirror-symmetrically as shown in fig. 8.
An upstream side through hole 33A and a downstream side through hole 33B are provided at the same height position above the upstream side partition plate 31A and the downstream side partition plate 31B, and a straight pipe-shaped upstream side pipe 32A and a straight pipe-shaped downstream side pipe 32B are attached at the positions. In order to prevent these tubes from interfering with each other, the upstream-side tube 32A is disposed so as to be slightly inclined such that the outlet portion 34 thereof is inclined rearward and leftward and downward, and the downstream-side tube 32B is disposed so as to be slightly inclined such that the inlet portion 35 thereof is inclined forward and rightward and downward. Therefore, the outlet portion 34 of the upstream-side tube 32A and the inlet portion 35 of the downstream-side tube 31B are arranged in a state of being non-parallel and non-coaxial with each other.
The outlet portion 34 of the upstream-side tube 32A and the inlet portion 35 of the downstream-side tube 32B contact each other at their overlapping portions. Preferably, the contact portion is welded and the contact area is substantially increased.
The directions of the upstream through hole 33A and the downstream through hole 33B are slightly changed from those of the first embodiment so as to be coaxial with the inlet portion 37 of the upstream pipe 32A and the outlet portion 38 of the downstream pipe 32B.
The flow of the exhaust gas G in the present embodiment is as follows. As shown by the arrows in fig. 8 and 9, the exhaust gas G discharged obliquely to the left and rearward from the outlet portion 34 of the upstream pipe 32A turns forward while swirling along the inner peripheral surface of the second passage pipe 10P, and then turns rearward and enters the inlet portion 35 of the downstream pipe 32B.
Therefore, as in the second embodiment, in addition to the twice-diverted flow in the front-rear direction, the flow in the swirling direction can be increased, and the mixing of the urea water and the exhaust gas G can be further promoted. Moreover, heating and hydrolysis of the urea water can be further promoted.
In addition, in the present embodiment, during the exit from the outlet portion 34 to the entrance portion 35, the relatively large space 36 below the upstream-side pipe 32A and the downstream-side pipe 32B is used to mix the urea water and the exhaust gas G, which may also promote mixing.
In the present embodiment, since the upstream side tube 32A and the downstream side tube 32B are in contact with each other, the exposed area of the tube surface in the space 36 can be reduced, heat dissipation from the tubes into the space 36 can be suppressed, and the heat storage effect of the tubes can be improved. In addition, in the first and second embodiments, a modification in which the upstream side tube 32A and the downstream side tube 32B contact each other is possible.
Other functions and effects are the same as those in the first embodiment.
Although embodiments of the present disclosure have been described in detail above, various other embodiments of the present disclosure are contemplated.
(1) The present disclosure is applicable not only to the above-described exhaust gas purification device having a sealed box-shaped casing, but also to a general exhaust gas purification device.
(2) The catalyst may not necessarily be NOxCatalyst, not being a selective reduction type NOxA catalyst. In addition, the reducing agent supplied to the catalyst may be changed according to the kind of the catalyst.
(3) As for the upstream-side tube and the downstream-side tube, the cross-sectional shape thereof may be arbitrary, and the inner diameter and the outer diameter thereof may not be constant and may vary.
(4) In the above embodiment, the number of combinations of the partition plates and the tubes is two, but three or more may be used. In this case, the present disclosure is applicable to any two combinations adjacent on the upstream side and the downstream side.
(5) The upstream-side tube and the downstream-side tube may not extend opposite to each other. For example, the upstream pipe may extend from the upstream partition plate to the downstream side in the rear direction, and the downstream pipe may extend from the downstream partition plate to the downstream side in the rear direction. This is because even in this case, if the outlet portion of the upstream-side pipe and the inlet portion of the downstream-side pipe are not in a coaxial state, the flow of the exhaust gas from the former to the latter can be curved. In addition, this is also because even in this case, the heat storage effect of the two tubes and the urea water heating effect can be ensured.
Unless specifically contradicted, the configurations of the above embodiments may be partially or entirely combined. The embodiments of the present disclosure are not limited to the above-described embodiments, but include any modifications, applications, and equivalents included within the concept of the present disclosure defined by the claims. Accordingly, the present disclosure should not be construed as limiting, but may be applied to any other technology that falls within the scope of the inventive concept.
The present application is based on the japanese patent application filed on.10.2.2017 (japanese patent application 2017-193020), the contents of which are incorporated herein by reference.
[ Industrial Applicability ]
The present disclosure is useful in that it has an effect of promoting mixing of injected urea water and exhaust gas, and NO provided in an exhaust passage of a diesel enginexThe catalyst can be operated efficiently.
[ description of reference numerals ]
1 exhaust gas purification device
5 exhaust passage
10 second channel
14 injection valve
23 NOxCatalyst and process for preparing same
31A upstream side partition plate
31B downstream side partition plate
33A upstream side through hole
33B downstream side through hole
32A upstream side pipe
32B downstream side tube
34 outlet part
35 entrance part
36 space
Claims (5)
1. An exhaust gas purification apparatus of an internal combustion engine, characterized by comprising:
an exhaust passage through which exhaust gas of the internal combustion engine flows;
a catalyst disposed in the exhaust passage;
an injection valve provided on an upstream side of the catalyst for injecting a reducing agent into the exhaust passage;
an upstream-side partition plate and a downstream-side partition plate that are provided at a distance from each other inside the exhaust passage on a downstream side of the injection valve and on an upstream side of the catalyst;
an upstream-side through hole and a downstream-side through hole provided in the upstream-side partition plate and the downstream-side partition plate, respectively;
an upstream side pipe provided in the upstream side partition plate and communicating with the upstream side through hole;
a downstream pipe provided in the downstream partition plate and communicating with the downstream through hole,
the outlet portion of the upstream-side pipe and the inlet portion of the downstream-side pipe are disposed in a non-coaxial state with each other.
2. The exhaust purification device of an internal combustion engine according to claim 1, wherein the upstream-side tube and the downstream-side tube protrude into a space between the upstream-side partition plate and the downstream-side partition plate.
3. The exhaust purification device of an internal combustion engine according to claim 2, an outlet portion of the upstream-side pipe and an inlet portion of the downstream-side pipe overlapping each other in upstream and downstream directions.
4. The exhaust purification device of an internal combustion engine according to claim 2 or 3, said upstream-side pipe and said downstream-side pipe being in contact with each other.
5. The exhaust purification device of an internal combustion engine according to any one of claims 1 to 4, at least one of the upstream-side separation plate and the downstream-side separation plate being inclined with respect to a direction perpendicular to a central axis of the exhaust passage.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017193020A JP6919478B2 (en) | 2017-10-02 | 2017-10-02 | Exhaust purification device for internal combustion engine |
| JP2017-193020 | 2017-10-02 | ||
| PCT/JP2018/036286 WO2019069810A1 (en) | 2017-10-02 | 2018-09-28 | Exhaust purification device for internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111183275A true CN111183275A (en) | 2020-05-19 |
| CN111183275B CN111183275B (en) | 2021-12-28 |
Family
ID=65994604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880064380.1A Active CN111183275B (en) | 2017-10-02 | 2018-09-28 | Exhaust gas purification device for internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6919478B2 (en) |
| CN (1) | CN111183275B (en) |
| WO (1) | WO2019069810A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002213233A (en) * | 2001-01-12 | 2002-07-31 | Komatsu Ltd | Exhaust emission control structure of engine |
| CN105386824A (en) * | 2015-11-25 | 2016-03-09 | 重庆新卓汇汽车净化器有限公司 | Automobile exhaust purifying device |
| CN106194367A (en) * | 2015-05-29 | 2016-12-07 | 埃贝斯佩歇排气技术有限责任两合公司 | For the exhaust silencer being laterally encased in vehicle |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4884332B2 (en) * | 2007-08-21 | 2012-02-29 | トヨタ自動車株式会社 | Exhaust system for internal combustion engine |
| JP5605578B2 (en) * | 2011-06-17 | 2014-10-15 | 三菱自動車工業株式会社 | Exhaust purification device |
| CN106170613B (en) * | 2014-03-11 | 2019-04-09 | 庄信万丰催化剂(德国)有限公司 | Selective catalytic reduction system operating and its application method |
-
2017
- 2017-10-02 JP JP2017193020A patent/JP6919478B2/en active Active
-
2018
- 2018-09-28 CN CN201880064380.1A patent/CN111183275B/en active Active
- 2018-09-28 WO PCT/JP2018/036286 patent/WO2019069810A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002213233A (en) * | 2001-01-12 | 2002-07-31 | Komatsu Ltd | Exhaust emission control structure of engine |
| CN106194367A (en) * | 2015-05-29 | 2016-12-07 | 埃贝斯佩歇排气技术有限责任两合公司 | For the exhaust silencer being laterally encased in vehicle |
| CN105386824A (en) * | 2015-11-25 | 2016-03-09 | 重庆新卓汇汽车净化器有限公司 | Automobile exhaust purifying device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019065783A (en) | 2019-04-25 |
| CN111183275B (en) | 2021-12-28 |
| JP6919478B2 (en) | 2021-08-18 |
| WO2019069810A1 (en) | 2019-04-11 |
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