GB2416718A - Gas treatment apparatus - Google Patents
Gas treatment apparatus Download PDFInfo
- Publication number
- GB2416718A GB2416718A GB0416917A GB0416917A GB2416718A GB 2416718 A GB2416718 A GB 2416718A GB 0416917 A GB0416917 A GB 0416917A GB 0416917 A GB0416917 A GB 0416917A GB 2416718 A GB2416718 A GB 2416718A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gas
- mixing
- mixing conduit
- aperture
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000011282 treatment Methods 0.000 title claims abstract description 106
- 230000003197 catalytic effect Effects 0.000 claims abstract description 59
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 132
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- F01N3/18—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 methods of operation; Control
- F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
- B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- 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
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/913—Vortex flow, i.e. flow spiraling in a tangential direction and moving in an axial direction
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Toxicology (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Dispersion Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
A gas treatment apparatus 1 comprises addition means 14 for adding a reducing agent 12 to a gas stream passing through the apparatus, a guide chamber 8, a mixing conduit 18 and a catalytic treatment chamber 16 containing a catalytic treatment unit. The apparatus is arranged such that gas must pass through the mixing conduit to pass from the guide chamber to the catalytic treatment chamber. The mixing conduit has an outer wall 22 including at least one aperture 30 through which gas can enter, the aperture having guide means 32 to cause the gas to flow circumferentially. The guide means may be in the form of a deflection wall extending from the side of the aperture into the mixing conduit. The apparatus is particularly suitable for treating exhaust gases from a vehicle having a diesel engine.
Description
2416718;..:: ......
Gas Treatment Apparatus The present invention relates to gas treatment apparatus and, in particular, to gas treatment apparatus for treating the exhaust gases from a diesel engine of a vehicle. The invention extends to a vehicle equipped with such gas treatment apparatus.
Diesel engine exhaust gases contain a number of noxious gases, such as nitrogen oxides, sulphur oxides and carbon oxides, as well as un-burnt hydrocarbons, carbon and other particles. The amount of sulphur oxides in the exhaust gases is dependent primarily upon the sulphur in the fuel and is controlled by the quality of the initial crude oil and the refining techniques used in the preparation of the fuel.
However, the other compounds can be treated so as to render them less obnoxious.
It is therefore common practice to pass the exhaust gases through one or more treatment elements such as catalytic converters and filters. The exhaust gases can be subjected to reduction of nitrogen oxides to nitrogen by injecting a reducing agent, typically urea dissolved in water, into the gas stream and then passing it through a catalytic treatment element to convert residual ammonia from the urea to nitrogen and water, which are acceptable exhaust emissions. This process is known as Selective Catalytic Reduction (SCR). In practice, the efficiency of the process is dependent upon the quality of the mixing of the reducing agent and gas before the mixture enters the catalyst.
Such a technology may also be combined with other ee.
2 - ;2 2 '.. ' ".' technologies such as catalysed Diesel Particulate Filters, CRT_ (Continuously Regenerating Trap) technology other treatment methods to further reduce undesirable emissions from diesel engines.
To ensure acceptable mixing of the reducing agent and gas stream a mixing region of the gas treatment apparatus can be large and therefore have a long residence time during which mixing and chemical breakdown of the urea-water solution can occur. To reduce the size of the apparatus it is known to include mixing elements within the mixing region that induce turbulence in the gas stream and encourage mixing. However, the addition of mixing elements in the mixing region can increase the back-pressure within the exhaust system, thereby reducing the torque output of the diesel engine from which the exhaust gases are emitted.
It is an object of the present invention to address some of the above issues.
According to the present invention there is provided a gas treatment apparatus for treating a gas stream, the gas treatment apparatus comprising addition means for adding a reducing agent to a gas stream passing through the apparatus, a guide chamber, a mixing conduit and a catalytic treatment chamber containing a catalytic treatment element, the apparatus being arranged such that gas must pass through the mixing conduit to pass from the guide chamber to the catalytic treatment chamber, the mixing conduit including an outer wall surrounding a mixing axis within the guide chamber, the outer wall including at least one aperture through which a gas can enter the mixing conduit from the 3 - ;. 'I.'.. .' A.' guide chamber, the at least one aperture including guide means associated therewith for causing at least some of a gas passing through the at least one aperture to flow circumferentially about the mixing axis within the mixing conduit before entering the catalytic treatment chamber.
Positioning at least a portion of the mixing conduit within the guide chamber and including at least one aperture in the outer wall of the mixing conduit causes gas to enter the mixing conduit substantially radially. In this case, the term 'radially' means that the gas must have a component of its flow velocity towards the mixing axis. It should be understood that the flow velocity could also include radial or axial components with respect to the mixing axis as the gas enters the gas treatment apparatus. The radial entry of the gas into the mixing conduit allows simple guide means to cause at least some of the gas to flow substantially circumferentially. The term 'circumferentially' means that the gas has a component of its flow velocity circumferentially around the mixing axis. It should be understood that the gas may still include an axial component to its motion so that the gas moves through the mixing conduit. Simple guide means are easy to construct and may have a low resistance to gas flow which enables a reduction in the pressure drop across the gas treatment apparatus caused as a gas stream flows through the apparatus. The reduction in pressure drop may increase the torque output of an engine to which the gas treatment apparatus is coupled.
The circumferential flow, or swirl, of the gas within the mixing conduit increases turbulence within the gas which promotes mixing of the gas and reducing agent. .e
. .
The guide chamber of the apparatus may be a conduit from an inlet into the apparatus, or from an upstream treatment chamber, to the mixing conduit. In the guide region it is possible that no treatment is performed on a gas passing therethrough. The guide chamber may comprise means for removing particulates, performing a catalytic treatment on a gas, or attenuating noise that may be generated as a gas flows through the apparatus, or transmitted by the gas flow.
The catalytic treatment chamber contains a catalytic treatment element that preferably catalyses a reaction between a gas stream passing through the apparatus and the reducing agent added such that NOX in the gas stream is converted to N2 and water. The preferred reducing agent is a urea in water solution and this is preferably added through an injector into the gas stream. The reducing agent is preferably injected so that at least some of the reducing agent reaches the rapidly swirling gas flow near the wall of the mixing conduit as this results in more efficient mixing.
Such an arrangement can be achieved in many ways, for example using a central injector injecting radially, or one or more injectors arranged adjacent the wall of the mixing conduit injecting reducing agent substantially axially.
It should be understood that the apparatus may include other chambers between the mixing conduit and the catalytic treatment chamber. Gas must still flow through the mixing conduit to pass from the guide chamber to the catalytic treatment chamber, but may additionally have to pass through other chambers. This enables the catalytic treatment chamber to be positioned away from the mixing conduit, possibly coupled thereto by a pipe or other conduit.
- e-. .. . It is preferred that the mixing conduit, catalytic treatment chamber, and guide chamber have substantially circular cross sections as this facilitates manufacture and reduces the likelihood of damage to the apparatus at weak spots that may occur at corners of the apparatus. It should be understood that the cross section of one or all of the sections mentioned above may not be circular, for example one or more may have elliptical cross sections, or other shapes depending upon the desired final use and location of the apparatus.
The outer wall of the mixing conduit preferably includes a plurality of apertures through which gas may flow, and each of which includes a guide means that causes at least some of the gas passing through the aperture to flow substantially circumferentially. All the guide means preferably cause the gas to flow circumferentially in the same direction about the mixing axis. It should be understood that there may be additional apertures through the outer wall of the mixing conduit which do not include guide means and, in this case, a circumferential flow of gas about the mixing axis would be created by the guide means provided.
If a plurality of apertures are provided through the outer wall of the mixing conduit, it is preferred that the apertures are substantially equally circumferentially spaced as this helps to maintain a substantially equal distribution of gas flow within the guide chamber and mixing conduit and this may help to avoid poor distribution of the reducing agent within the gas stream.
The guide means may be any size, shape or configuration but - 6 - ' are preferably formed integrally with the outer wall rather than formed separately and then attached. A deflection wall which is angled such that at least some of a gas passing substantially radially through the aperture is deflected by a surface of the deflection wall and caused to flow substantially circumferentially is preferred due to the simplicity in construction and low pressure drop of such a design.
The apertures are preferably substantially rectangular and are preferably arranged such that a long axis of the rectangular aperture is substantially parallel with the mixing axis.
The apertures and guide means can be formed in a plurality of different ways. An embodiment of the aperture and guide means is a "louver" design which comprises a substantially rectangular aperture with a substantially rectangular deflection wall attached to a long edge of the aperture. A mixing conduit having such an embodiment can be readily fabricated using sheet metal, the sheet metal being stamped such that three of the sides that will define the rectangular aperture are cut (in a preferred example, two short sides and one long side) and the resulting flap of metal is bent so that the aperture is opened, the folded edge of the flap defines the aperture together with the three cut sides and the flap is arranged to form a deflection wall. A plurality of such apertures and deflection walls are formed in the sheet and the sheet is then rolled to form the outer wall of the mixing conduit. The seam where two ends of the sheet meet may then be welded to form the mixing conduit.
J
- 7 - b Other examples of aperture and guide means include a "twisted ribbon" design and an "out of plane" design. In the "twisted ribbon" design two slits are made through the wall of the mixing conduit. The slits are preferably made such that they are substantially parallel with the mixing axis and have a substantially equal length. The two slits define two sides of a 'ribbon' of material which is attached to the wall of the mixing conduit at each end. To create the guide means and aperture the ribbon is twisted by forcing a first side of the 'ribbon' into the mixing conduit and a second side of the ribbon out of the conduit, simultaneously opening an aperture through the wall and creating guide means.
The "out of plane" design is based on the "louver" design.
Two adjacent sets of cuts through the wall of the mixing conduit are formed such that the resulting deflection walls are attached to adjacent long edges of the two apertures.
One deflection wall is bent into the mixing conduit and one out of the mixing conduit.
The deflection walls can be curved or otherwise shaped to aid in the deflection of gas in the required direction. It should be understood that the deflection walls and apertures can be formed in a variety of other ways, which may include, for example, separate fabrication of deflection walls and subsequent attachment to the mixing conduit wall. It should be understood that the apertures may have any suitable shape.
The guide chamber and catalytic treatment chambers may be separate chambers, joined by an elongate mixing conduit, or the two chambers may have a common outer wall and a gas be prevented from passing from the guide chamber to the - 8 - 8 8 8,, catalytic treatment chamber by a wall through which the mixing conduit passes. Such a wall is preferably substantially perpendicular to a chamber axis around which the common outer wall extends.
It is preferred that the mixing conduit has a smaller cross sectional area for gas flow than the catalytic treatment chamber. This allows the swirling gas flow from within the mixing conduit to expand radially upon entry into the catalytic treatment chamber. This slows the rotation of the gas flow and since the cross sectional area for flow is increased, the axial speed of the gas flow is also reduced which allows a longer residence time within the apparatus.
The catalytic treatment chamber may include an entry portion located between the mixing conduit and the catalytic treatment element. This allows gas leaving the mixing conduit to disperse across the entire cross section of the catalytic treatment chamber before entering the catalytic treatment element. This radial dispersal reduces the rotational velocity of the gas stream which reduces the pressure loses associated with a rapidly rotating gas flow entering a catalytic treatment element.
It is further preferred that the mixing conduit has a smaller cross sectional area for gas flow than the guide chamber.
This means that the average gas speed is increased as a gas stream flowing through the apparatus passes from the guide chamber to the mixing conduit. The increased gas speed is both axial and circumferential and this results in greater turbulence within the mixing region and therefore more efficient mixing. .
ë:. :. :e: :. . . . . . .e - 9 The invention will now be further described, by way of example, with reference to the accompanying drawings, in which: Figure 1 shows a schematic view of a gas treatment apparatus; Figure 2 shows a cross section through a portion of an embodiment of gas treatment apparatus according to the invention; Figure 3 shows a detailed view of an aperture of Figure 2; Figure 4 shows the cross section of Figure 2 including arrows indicating gas flows; Figure 5 shows a cross section through a mixing conduit and illustrates the possible path of reducing agent; Figures 6,7,8 and 9 show possible arrangements of gas treatment apparatus according to the invention; and Figures 10,11 and 12 show cross sections through possible guide wall and aperture arrangements.
Figure 1 shows a schematic representation of a gas treatment apparatus 1 having an inlet 2, an outlet 3 and a surrounding wall 4. It should be understood that, although the surrounding wall is shown as a single wall, it may be formed from two or more wall sections welded or coupled together.
Arrows 6 show the direction of gas flow through the apparatus ;:: Act. 10
1. Gas enters the apparatus 1 through the inlet 2 and enters a guide chamber 8. The guide chamber 8 guides gas towards a mixing region 10 in which a reducing agent 12 is added to the gas stream using addition means 14 and in which the gas and reducing agent 12 are mixed. Upon leaving the mixing region 10, the gas enters a catalytic treatment chamber 16 comprising an entry portion 17 and a catalytic treatment element 20. The catalytic treatment element 20 includes a catalyst that catalyses a reaction between at least one chemical within the gas stream and the reducing agent 12.
The gas leaving the catalytic treatment element 20 then exits the apparatus 1 through the outlet 3.
Although the inlet 2 and outlet 3 are shown in Figure 1 as having a smaller diameter than the surrounding wall 4 of the apparatus 1, it should be understood that the inlet 2 and outlet 3 may be any suitable size or shape. It should also be understood that the gas passing through the inlet 2 may already have undergone one or more gas treatments, for example filtration, a catalytic treatment, or other treatment.
Figure 2 shows a cross section through the gas treatment apparatus shown in Figure 1. This Figure shows the mixing region 10, an end of the guide chamber 8 and a start of the catalytic treatment chamber 16.
The mixing region 10 includes a mixing conduit 18 which includes an outer wall 22 that surrounds a mixing axis 20 and an endwall 24. The outer wall 22 extends into the guide chamber 8. The addition means 14 extends through the surrounding wall 4 and through the endwall 24 of the mixing ::: ;: e:.: :: . ë eve A-: conduit 18 so that outlets 26 from the addition means 14 are arranged such that reducing agent 12 is injected into the gas stream substantially radially outwardly from the mixing axis 20. In this case there are ten outlets 26 substantially equally circumferentially distributed around an outlet end 28 of the addition means 14. It should be understood that any suitable number of injector outlets may be used and injection may occur in directions other than radially.
The mixing conduit 18 also includes apertures 30 through the outer wall 22 through which gas from the guide chamber 8 can enter the mixing conduit 18. In this example the endwall 24 includes no apertures, and prevents gas from entering the mixing conduit without passing through the apertures 30 in the outer wall 22. It should be understood that the endwall 24 may also include apertures.
Guide means 32 are associated with each of the apertures 30.
The guide means 32 (in this case guide walls 34) cause at least some of the gas passing through the apertures 30 to flow circumferentially around the mixing axis 20. The guide means 32 and apertures are better shown in Figure 3.
The guide chamber 8 and catalytic treatment chamber 16 are separated by a wall 13 through which the mixing conduit 18 passes.
Figure 3 shows a detailed view of the apertures 30 of Figure 2. The aperture 30 is rectangular having long sides 36 and short sides 38. The long sides 36 are substantially parallel with the mixing axis 20. The guide means 32 is a deflection wall 34 that extends from a long side 36 of the aperture 30 e. ë.
e into the mixing conduit 18.
Gas passing from the guide chamber 8 into the mixing conduit 18 through the aperture 30 may contact the deflection wall 34 and be deflected so that it moves substantially circumferentially around the mixing axis 20. The deflected gas from the apertures 30 cause the gas flow within the mixing conduit 18 to swirl or rotate about the mixing axis 20 which increases turbulence and therefore promotes mixing.
The deflection wall 34 of Figure 3 is formed by cutting three sides of the aperture 30 and then bending the resulting flap into the mixing conduit to form the deflection wall 34 and the fourth side of the aperture 30.
Figure 4 shows the same view as Figure 3, but includes arrows 6 showing the direction of gas flow. In the guide chamber 8 the gas flow is substantially parallel with the surrounding wall 4. As the gas enters the mixing region 10, the gas is prevented from passing directly to the catalytic treatment chamber 10 by wall 13. The gas is therefore 'funnelled' through the apertures 30 and into the mixing conduit 18. As the gas passes through the apertures 30 it contacts the guide means and the gas flow is therefore caused to rotate about the mixing axis 20. Into the rapidly swirling gas stream a reducing agent 12 is added by the addition means 14. The reducing agent 12 and the gas stream mix in the rapidly swirling gas and exit the mixing conduit 18 into the catalytic treatment chamber 16. As the gas enters the catalytic treatment chamber 16 the gas slows and the flow expands radially as the diameter of the catalytic treatment chamber 16 is bigger than that of the mixing conduit 18. The :: :: .. A: :. a:: : :: 13 - : gas is still rotating within the catalytic treatment chamber 16, but slower. The rotation of the gas facilitates the radial expansion of the gas to fill the larger diameter flow path of the catalytic treatment chamber 16.
The deflection wall 34 helps to re-entrain droplets of reducing agent 12 that may form within the mixing conduit.
Figure 5 shows a cross section through a mixing conduit 18 and shows reducing agent 12 being added from addition means 14, in this case an injector having 4 substantially radially directed outlets 26. Again, arrows 6 are used to show the direction of gas flow.
Figure 5 shows a droplet 40 of reducing agent on a face 42 of a deflection wall 34 facing an outlet 26. The rapidly swirling gas flow within the mixing conduit 18 moves the droplet 40 towards an edge 44 of the deflection wall 38. The droplet 40 is then entrained in the gas flow as shown by the path 46.
Figures 6 to 9 show different arrangement of gas treatment apparatus. In each case, the different parts of the apparatus that have the same function as in the apparatus 1 shown in Figure 2 will retain their reference numeral, but these will be incremented by 100,200,300 or 400 respectively.
Figure 6 shows a gas treatment apparatus 101 having a similar arrangement to that shown in Figure 1 in that the apparatus 101 is substantially enclosed by a substantially cylindrical surrounding wall 104, with all the chambers 108,116 and regions 110 arranged in a substantially linear arrangement.
:: :: .:. ..
:. :e :.
Figure 7 shows a gas treatment apparatus 201 having a arrangement to Figure 6, except that the mixing axis 220 along which a portion of the mixing region 218 extends is arranged substantially perpendicular to the surrounding wall 204 and a bend 50 in the mixing conduit 218 redirects the swirling gas flow towards the catalytic treatment chamber 216.
Figure 8 shows a gas treatment apparatus 301 having a twin tube arrangement. The guide chamber 308 and catalytic treatment chamber 316 are separate chambers linked by a transfer conduit 52 that extends from the mixing conduit 318 into the catalytic treatment chamber 316. The mixing axis 320 extends substantially perpendicular to a central axis of the guide chamber 308. In the gas treatment apparatus 301 the gas flows through the guide chamber 308 substantially parallel with the central axis of the guide chamber 308 and then enters the mixing conduit 318 and is caused to swirl.
The swirling gas flows through the mixing conduit 318 and then into the transfer conduit 52. The transfer conduit 52 directs the gas into the catalytic treatment chamber 320 where the gas decelerates before entering the catalytic treatment element 320. In this arrangement, the gas flow through the catalytic treatment chamber 316 in a direction opposite to that in which the gas flows through the guide chamber 308. It should be understood that this need not be the case, the transfer conduit 52 could include bends to redirect the gas and/or the catalytic treatment chamber 316 could be orientated in a different direction.
Figure 9 shows a gas treatment apparatus 401 which has :e: r substantially the same arrangement as the gas treatment apparatus 301 in Figure 8. In this case, the transfer conduit 152 includes a bend 54 within the catalytic treatment chamber 416 to redirect the gas stream towards the catalytic treatment element 420.
Figure 10 shows a cross section through a guide wall and aperture 70 according to a "twisted ribbon" design. The cross section is taken so that only half the aperture and guide wall 70 is shown so that the structure can be more easily understood. The guide wall and aperture 70 is formed by two parallel slits 72 which define a ribbon 74 therebetween. The ribbon 74 is twisted and deformed such that a leading edge 76 is raised out of the mixing conduit and a trailing edge 78 is within the mixing conduit.
Figure 11 shows a cross section through a guide wall and aperture 170 according to an "out of plane" design. The cross section is taken so that only half the aperture and guide wall 170 is shown so that the structure can be more easily understood. The guide wall and aperture 170 in fact comprise two guide walls 78,80 which are formed in a similar way to the wall 34 of the louver design shown in Figure 3. The wall 78 is bent so that it extends away from the mixing conduit and the wall 80 is bent so that it extends into the mixing conduit. In this case, both walls 78,80 are curved to direct gas flow. The long edges 136,236 of the walls 78,80 that remain attached to the mixing conduit wall 22 are adjacent.
Figure 12 shows a cross section through a guide wall and aperture 270 according to a "cheese grater" design. The cross section is taken so that only half the aperture and guide :e ce. ::' F. F wall 270 is shown so that the structure can be more easily understood. The aperture and guide wall 270 is formed by a single slit 82 through the mixing conduit wall 22. A region 84 of the wall 22 adjacent the slit 82 is deformed to form a guide wall 86 that extends into the mixing conduit.
It should be understood that the invention has been described above by way of example only and that modifications in detail may be made without departing from the scope of the invention as described in the claims.
Claims (17)
- ë ë 17 . . . . . .Claims 1. A gas treatment apparatus for treating a gas stream, the gas treatment apparatus comprising addition means for adding a reducing agent to a gas stream passing through the apparatus, a guide chamber, a mixing conduit and a catalytic treatment chamber containing a catalytic treatment element, the apparatus being arranged such that gas must pass through the mixing conduit to pass from the guide chamber to the catalytic treatment chamber, the mixing conduit including an outer wall surrounding a mixing axis within the guide chamber, the outer wall including at least one aperture through which a gas can enter the mixing conduit from the guide chamber, the at least one aperture including guide means associated therewith for causing at least some of a gas passing through the at least one aperture to flow circumferentially about the mixing axis within the mixing conduit before entering the catalytic treatment chamber.
- 2. A gas treatment apparatus as claimed in claim 1, in which there are a plurality of apertures through the outer wall of the mixing conduit and each aperture includes guide means for causing at least some of a gas passing through the aperture to flow circumferentially about the mixing axis within the mixing conduit.
- 3. A gas treatment apparatus as claimed in claim 1 or claim 2, in which the mixing conduit has a substantially circular cross section.
- 4. A gas treatment apparatus as claimed in any preceding claim, in which the catalytic treatment chamber has a e e e e 18 - e substantially circular cross section.
- 5. A gas treatment apparatus as claimed any previous claim, in which the guide chamber has a substantially circular cross section.
- 6. A gas treatment apparatus as claimed in any of claims 2 to 5, in which the plurality of apertures are substantially equally circumferentially spaced around the outer wall of the mixing conduit.
- 7. A gas treatment apparatus as claimed in any preceding claim, in which the guide means comprise a deflection wall, the deflection wall being angled such that at least some of a gas passing substantially radially through the, or each, aperture is deflected by the deflection wall to flow substantially circumferentially.
- 8. A gas treatment apparatus as claimed in any preceding claim, in which the, or each, aperture is substantially rectangular.
- 9. A gas treatment apparatus as claimed in claim 8' in which the, or each, aperture is arranged such that a long axis of the rectangular aperture is substantially parallel with the mixing axis.
- 10. A gas treatment apparatus as claimed in claim 8 or claim 9, in which the guide means associated with the, or each, aperture comprises a substantially rectangular deflection wall, the deflection wall extending from a side of the aperture into the mixing conduit.. . . . . . . . - 19 -. . . . . .
- 11. A gas treatment apparatus as claimed in any of claims 1 to 6, in which the guide means and aperture in the wall of the mixing region are formed by forming a cut in the wall of the mixing chamber and then deforming a region of said wall adjacent to the cut into the mixing conduit such that an aperture is opened and a guide means formed.
- 12. A gas treatment apparatus as claimed in any preceding claim, in which gas is prevented from passing from the guide chamber to the catalytic treatment chamber by a wall through which the mixing conduit passes.
- 13. A gas treatment apparatus as claimed in any preceding claim, in which the mixing conduit has a smaller cross sectional area for gas flow than the catalytic treatment chamber such that the average gas speed is decreased as a gas stream flowing through the apparatus passes from the mixing conduit to the catalytic treatment chamber.
- 14. A gas treatment apparatus as claimed in any preceding claim, in which the mixing conduit has a smaller cross sectional area for gas flow than the guide chamber such that the average gas speed is increased as a gas stream flowing through the apparatus passes from the guide chamber to the mixing conduit.
- 15. A gas treatment apparatus as claimed in any preceding claim, in which the catalytic treatment chamber includes an entry portion located between the mixing conduit and the catalytic treatment element such that a gas leaving the mixing conduit can disperse across the entire cross section .e e a ee.2 0 - of the catalytic treatment chamber before entering the catalytic treatment element.
- 16. A gas treatment apparatus substantially as herein described with reference to, or as shown in, the accompanying drawings.
- 17. A vehicle having a diesel engine, the vehicle being equipped with a gas treatment apparatus as claimed in any preceding claim.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0416917A GB2416718A (en) | 2004-07-29 | 2004-07-29 | Gas treatment apparatus |
PCT/GB2005/002934 WO2006010922A1 (en) | 2004-07-29 | 2005-07-26 | Gas treatment apparatus |
US11/569,200 US20070274877A1 (en) | 2004-07-29 | 2005-07-26 | Gas treatment appartatus |
EP05762913A EP1771645A1 (en) | 2004-07-29 | 2005-07-26 | Gas treatment apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0416917A GB2416718A (en) | 2004-07-29 | 2004-07-29 | Gas treatment apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
GB0416917D0 GB0416917D0 (en) | 2004-09-01 |
GB2416718A true GB2416718A (en) | 2006-02-08 |
Family
ID=32947643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0416917A Withdrawn GB2416718A (en) | 2004-07-29 | 2004-07-29 | Gas treatment apparatus |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070274877A1 (en) |
EP (1) | EP1771645A1 (en) |
GB (1) | GB2416718A (en) |
WO (1) | WO2006010922A1 (en) |
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EP2518287A4 (en) * | 2009-12-24 | 2014-12-10 | Hino Motors Ltd | Exhaust purification device |
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EP3267005A1 (en) * | 2010-06-22 | 2018-01-10 | Donaldson Company, Inc. | Exhaust aftertreatment device |
EP2585693B1 (en) * | 2010-06-22 | 2017-06-14 | Donaldson Company, Inc. | Dosing and mixing arrangement for use in exhaust aftertreatment |
US10294841B2 (en) | 2010-06-22 | 2019-05-21 | Donaldson Company, Inc. | Dosing and mixing arrangement for use in exhaust aftertreatment |
US10968800B2 (en) | 2010-06-22 | 2021-04-06 | Donaldson Company, Inc. | Dosing and mixing arrangement for use in exhaust aftertreatment |
US11608764B2 (en) | 2010-06-22 | 2023-03-21 | Donaldson Company, Inc. | Dosing and mixing arrangement for use in exhaust aftertreatment |
FR2972021A1 (en) * | 2011-02-25 | 2012-08-31 | Peugeot Citroen Automobiles Sa | DEVICE FOR PROTECTING A REDUCER INJECTOR |
EP2492465A1 (en) * | 2011-02-25 | 2012-08-29 | Peugeot Citroën Automobiles SA | Device for protecting a reducer injector |
EP2607641A1 (en) * | 2011-12-19 | 2013-06-26 | Mtu Friedrichshafen Gmbh | Mixer device for introducing a reducing agent to an exhaust gas flow with blade-shaped means |
FR3097590A1 (en) * | 2019-06-21 | 2020-12-25 | Faurecia Systemes D'echappement | Device for mixing a liquid and a gas flow and exhaust line comprising such a device |
Also Published As
Publication number | Publication date |
---|---|
WO2006010922A1 (en) | 2006-02-02 |
GB0416917D0 (en) | 2004-09-01 |
EP1771645A1 (en) | 2007-04-11 |
US20070274877A1 (en) | 2007-11-29 |
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