GB2351244A - Exhaust gas cleaning installation with nitrogen oxide adsorber and hydrocarbon metering - Google Patents
Exhaust gas cleaning installation with nitrogen oxide adsorber and hydrocarbon metering Download PDFInfo
- Publication number
- GB2351244A GB2351244A GB0013354A GB0013354A GB2351244A GB 2351244 A GB2351244 A GB 2351244A GB 0013354 A GB0013354 A GB 0013354A GB 0013354 A GB0013354 A GB 0013354A GB 2351244 A GB2351244 A GB 2351244A
- Authority
- GB
- United Kingdom
- Prior art keywords
- exhaust
- metering
- nitrogen oxide
- exhaust gas
- gas
- 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.)
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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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
-
- 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
-
- 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
- B01D53/9495—Controlling the catalytic process
-
- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
-
- 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
- F01N3/36—Arrangements for supply of additional fuel
-
- 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
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Toxicology (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
An exhaust-gas cleaning installation for cleaning the exhaust gas from a combustion device, has a nitrogen oxide adsorber 3, which in an adsorption operating mode adsorbs nitrogen oxides contained in the exhaust gas supplied and in a desorption operating mode desorbs adsorbed nitrogen oxides, and has a hydrocarbon-metering device which, during the desorption operating mode, meters hydrocarbons out of a tank 5, via a metering line 4a, 4b, into the exhaust gas fed to the nitrogen oxide adsorber 3. The metering line 4a opens out from a vapour-chamber area 5a of the tank 5, and the metering devices meters hydrocarbons in vapour form from there, via the metering line 4b, to the exhaust gas which is fed to the nitrogen oxide adsorber 3. Also disclosed is a hydro carbon sensor in the metering line.
Description
1 2351244 Exhaust-gas cleaning installation with nitrogen oxide adsorber
and hydrocarbon metering The invention relates to an exhaust-gas cleaning installation for cleaning the exhaust gas from a combustion device, the installation having a nitrogen oxide adsorber, which in an adsorption operating mode adsorbs nitrogen oxides contained in the exhaust gas supplied and in a desorption operating mode desorbs adsorbed nitrogen oxides. Exhaust-gas cleaning installations of this type are used in particular, but not exclusively, to clean the exhaust gas from motor vehicle internal- combustion engines which are run predominantly in lean-bum mode.
The nitrogen oxide adsorber which is provided in the exhaust-gas cleaning installation, in the adsorption operating mode, takes up the nitrogen oxides which are contained in the exhaust gas supplied and are generally produced to an increased extent during lean-bum operating phases in the case of motor vehicle internal -combustion engines, for example. The nitrogen oxides are temporarily stored by adsorption in the nitrogen oxide adsorber, predominantly in nitrate form. At the latest when the nitrogen oxide storage capacity of the nitrogen oxide adsorber is reached, the adsorber is switched over to a desorption operating mode, during which the nitrogen oxides which have previously been adsorbed are desorbed. To do this, it is known, inter alia, that it is beneficial to set a rich exhaust-gas composition, i.e. a composition with an air/fuel ratio which lies below the stochiometric level of one.
Various methods for setting the rich exhaust-gas composition during the desorption mode are known, the method which is of greatest interest consisting in feeding hydrocarbons into the exhaust-gas stream from the outside. Compared to an alternative method, in which the combustion device is switched to rich mode, in order to increase the level of unbumt hydrocarbons in the exhaust gas, this method has the advantage that the operation of the combustion device can be kept substantially separate from the desorption mode for the nitrogen oxide adsorber. The hydrocarbons contained in the exhaust gas which is to be cleaned during the desorption mode of the nitrogen oxide adsorber can be used to convert the nitrogen oxides which are released from the nitrogen oxide adsorber into nitrogen by a nonselective catalytic reduction reaction, the hydrocarbons functioning as nonselective reducing agents. The reduction reaction may also take place in the nitrogen oxide adsorber itself or in a separate, downstream nitrogen oxide reduction catalytic 2 converter. The nitrogen oxide adsorber generally contains a catalyst material and is then usually referred to as a nitrogen oxide adsorber catalyst. As an alternative to the nonselective catalytic reduction, the further treatment of the desorbed nitrogen oxides may also take place by recycling exhaust gas, for example.
To meter in the hydrocarbons from the outside, i.e. from outside the combustion device, known exhaust-gas cleaning installations have a corresponding hydrocarbon-metering device. During the desorption operating mode, this device meters hydrocarbons out of a tank, via a metering line which opens out from this tank, into the exhaust gas fed to the nitrogen oxide adsorber. For this purpose, hydrocarbons are usually stored in liquid form in the tank, removed from the tank in liquid form and fed via the metering line into the exhaust-gas stream; a nozzle which injects the liquid hydrocarbons, in as finely dispersed form as possible, into the exhaust-gas stream may be provided at the end of the metering line to effect this feeding. A delivery pump is usually arranged in the metering line for conveying the liquid hydrocarbons from the tank to the exhaust gas. In addition, a controllable valve may be provided in the metering line. An exhaust-gas cleaning installation of this known type, in addition to installations of different designs, is disclosed in publications EP 0,597,106 Al and EP 0,625,633 Al. In these documents, by way of example, petrol, iso-octane, hexane, heptane, light oil, a lamp oil, butane or propane are proposed as hydrocarbons which are to be metered into the exhaust gas via the metering device, which are stored in a dedicated tank provided for this purpose.
The present invention seeks to provide an exhaust-gas cleaning installation of the type referred to in the introduction, by means of which hydrocarbons can be introduced with relatively little outlay and good meterability into the exhaust gas fed to the nitrogen oxide adsorber, in order to regenerate the latter, removing accumulated nitrogen oxides, in the desorption operating mode and to remove the nitrogen oxides from the exhaust gas, for example by nonselective catalytic reduction.
According to the present invention there is provided an exhaust-gas cleaning installation for cleaning the exhaust gas from a combustion device, the installation having a nitrogen oxide adsorber, which in an adsorption operating mode adsorbs nitrogen oxides contained in the exhaust gas supplied and in a desorption operating mode desorbs adsorbed nitrogen oxides, and a hydrocarbon-metering device which, during the desorption operating mode, meters hydrocarbons from a source thereof, via a metering line, into the exhaust gas fed to the nitrogen oxide adsorber, wherein the 3 metering line opens out from a vapour-chamber area of the source and, from there, the hydrocarbon-metering device meters hydrocarbons in vapour form, via the metering line, to the exhaust gas which is fed to the nitrogen oxide adsorber.
In this installation, the metering line opens out from a vapour-chamber area of the tank, and, from there, the hydrocarbon-metering device removes hydrocarbons in vapour form and meters the hydrocarbon vapour, via the metering line, to the exhaust gas which is fed to the nitrogen oxide adsorber. With this measure, the hydrocarbons which are used to regenerate the nitrogen oxide adsorber can, on the one hand, be stored in liquid form in a simple manner and, on the other hand, can be fed into the exhaust gas in vapour form. The fact that the hydrocarbons are introduced into the exhaust gas in vapour form enables the amount of hydrocarbons fed in to be controlled successfully, and intimate mixing with the exhaust gas is possible with reduced effort compared with metering in Z liquid form.
In a development of an exhaust-gas cleaning installation, the tank at the same time serves as a fuel tank for the combustion device, i.e. the stored fuel is used in liquid form to operate the combustion device and, as a hydrocarbon vapour flow extracted from the vapour chamber of the tank, to desorb previously adsorbed nitrogen oxides in the nitrogen oxide adsorber and, if appropriate, to reduce them to nitrogen. This obviates the need for a dedicated tank for both the fuel supply to the combustion device, on the one hand, and the enrichment of the exhaust gas, on the other hand.
In a further development of the exhaust-gas cleaning installation, an activated-carbon filter container is provided, which is connected to the vapour-chamber region of the tank and has an air port. The connection of such an activated-carbon filter container is known for petrol tanks of motor vehicle internal-combustion engines in order, on the one hand, to enable the pressure of the tank to be balanced with respect to the outside environment and, on the other hand, to prevent significant amounts of hydrocarbon vapours from escaping to the atmosphere. In the present case, the hydrocarbon vapours situated in the activated-carbon filter container are fed into the exhaust gas which is fed to the nitrogen oxide adsorber with the aid of a flushing-air flow fed via the air port during the desorption operating phases of the nitrogen oxide adsorber. Sufficient amounts of hydrocarbon vapours can always accumulate again in the activatedcarbon filter container between successive desorption operating phases.
4 In a further configuration of this measure, a controllable delivery pump is provided upstream of the air port of the activated-carbon filter container, via which pump flushing air can be pumped in controllable quantities into the activated-carbon filter container, where it entrains hydrocarbon vapours which are formed there into the exhaustgas stream.
In a further embodiment of the exhaust-gas cleaning installation, the metering line opens out into an exhaust-system section, which feeds the exhaust gas to the nitrogen oxide adsorber, at a suction point, the suction point being formed by a passive intake configuration, for example in the form of a bypass intake with venturi nozzle. As a result, the hydrocarbon metering to the exhaust gas can be effected by the sucking action of the exhaust-gas stream, or can at least be assisted by this action, so that if appropriate a delivery pump may be dispensed with.
In a further embodiment of the exhaust-gas cleaning installation, a controllable valve and/or a controllable delivery pump is provided in the metering line, so that the periods for which hydrocarbons are metered to the exhaust gas and the amounts of hydrocarbons metered can be controlled as desired using the valve or the delivery pump.
In a further development of the exhaust-gas cleaning installation, a hydrocarbon sensor is arranged in the metering line, by means of which sensor the amount of hydrocarbons metered into the exhaust gas can be determined.
An advantageous embodiment of the invention is illustrated in the drawing and described below by way of example.
The sole figure shows a diagrammatic illustration, in the form of a block diagram, of an exhaust-gas cleaning installation for cleaning the exhaust gas of, for example, a motor vehicle internal-combustion engine.
The exhaust-Cas cleaning installation shown is used to clean the exhaust gas from a combustion device 1, which in the example outlined is formed by an engine. This engine I may in particular be a spark-ignition engine of a motor vehicle which, if only for fuel consumption reasons, is predominantly operated in lean-burn mode, e.g. a spark-ignition engine with direct injection. During the lean-bum operating phases of the engine 1, the exhaust gas which it emits into an exhaust system 2 contains a high level of nitrogen oxides, which are adsorbed by a nitrogen oxide adsorber 3 in the exhaust-gas cleaning installation and as a result are temporarily stored, for which purpose the nitrogen oxide adsorber 3 is arranged in the exhaust system 2 and, during these periods, is run in the adsorption mode. At the latest when the nitrogen oxide adsorber 3 has reached its maximum loading level for nitrogen oxides which are adsorbed predominantly in nitrate form, the adsorption operating mode is interrupted each time by a desorption operating mode, during which the previously adsorbed nitrogen oxides in the nitrogen oxide z adsorber 3 are desorbed again.
To switch over to the desorption operating mode, on the one hand the nitrogen oxide adsorber 3 is brought to a suitable elevated temperature, for example by external heating or by adjustment of the engine operation in such a manner that an elevated exhaust-gas temperature results, and, on the other hand, hydrocarbons in vapour form are admixed to the exhaustgas stream fed to the nitrogen oxide adsorber 3 by means of a hydrocarbonmetering device. The hydrocarbon-metering device used for this purpose comprises a metering line, which by way of a first section 4a leads from a tank 5 to an activated-carbon filter container 6 and, by way of a second section 4b, leads from the activated-carbon filter container 6 into the exhaust system 2 upstream of the nitrogen oxide adsorber 3.
The taffic 5 is a standard fuel tank for the engine 1, i.e. a fuel line 6 opens out at a point low down in the tank 5 and passes stored liquid hydrocarbons, e.g. standard or premium petrol, to the engine 1. As usual, the top area 5a of the tank 5 forms a vapourchamber area, which is filled by the vapours of the hydrocarbons stored in liquid form. The associated section 4a of the metering line opens out from the tank 5 in this upper vapour-chamber area 5a and functions as a pressure-compensation line. To this end, this upstream metering-line section 4a leads into the activatedcarbon filter container 6 which, for its part, via an activated-carbon filter element contained therein, forms a connection between the upstream metering-line section 4a and an air port 7 leading to the outside. A flushing-air line 8, via which outside air can be passed into the activated-carbon filter container 6, opens into the air port 7. In the activated-carbon filter container 6, flushing air which is supplied then entrains the hydrocarbon vapours which have collected therein and are predominantly short-chain hydrocarbons, into the downstream metering-line section 4b when, during active operation of the metering device, hydrocarbons in vapour form are to be metered into the exhaust system 2.
In the upstream metering-line section 4b there is a hydrocarbon sensor 9, which can be used to detect the amount of hydrocarbons metered in. Furthermore, a shutoff/non-retum valve 10, which if necessary may be of controllable design, is provided in 6 the downstream metering-line section 4b. A downstream flame-barrier element 11 prevents flashbacks from the exhaust system 2 via the upstream metering-line section 4b to the activated-carbon filter container 6.
The upstream metering-line section 4b opens into the exhaust system 2 at an opening point 12 which is preferably formed by a passive intake configuration and, in this way, forms a suction point, by means of which the flushing air, together with the entrained hydrocarbon vapours, can be sucked in by a sucking flow action of the exhaustgas stream in the exhaust system 2. The passive intake configuration of the opening point 12 may, for example, be formed by a bypass intake using a venturi nozzle. As an alternative or in addition to this passive intake configuration at the opening point 12, a delivery pump (not shown) may be arranged in the upstream metering-line section 4b, for example instead of the shutoff/non-retum valve 10, and preferably with a non-return valve connected upstream. This enables the hydrocarbon vapours to be metered into the exhaust system 2 using excess pressure. Instead of or in addition to such a controllable delivery pump in the metering line, it is optionally possible to provide a delivery pump 13 in the air-supply line 8 upstream of the air port 7 of the activated-carbon filter container 6, as indicated by dashed lines in the figure. In this case, the flushing air can be pumped into the activated-carbon filter container 6 under excess pressure and, from there, together with the entrained hydrocarbon vapours, can be pumped into the downstream metering-line section 4b.
Like the other components of the exhaust-gas cleaning installation, which in addition to the nitrogen oxide adsorber 3 shown here may, depending on the particular application, contain any desired further exhaust-gascleaning components, the hydrocarbon-metering device is activated by an associated exhaust-gas cleaning control unit, which is preferably integrated in an engine control unit (not shown) for the engine 1. In the control unit, the appropriate control algorithm for the periodic change between adsorption mode and desorption mode of the nitrogen oxide adsorber is implemented. If one or two of the abovementioned delivery pumps are used, suitable characteristic diagrams for appropriately controlling the corresponding delivery pump are stored, for example, in the control unit.
During the lean-burn operating phases of the engine 1, the hydrocarbonmetering device remains deactivated and the nitrogen oxide adsorber 3 takes up the nitrogen oxides contained in the exhaust gas which is supplied. In parallel, the activated- 7 carbon filter container 6 fills up with the hydrocarbon vapours which are supplied from the vapour-chamber area 5a of the tank 5 via the upstream metering-line section 4. Then, as soon as there is a change from the adsorption operating mode to the desorption operating mode in order for the nitrogen oxide adsorber 3 to be regenerated, the associated control unit activates the hydrocarbon-metering device, i.e. it opens the shut- off/nonreturn valve 10 or activates the delivery pump. By means of the hydrocarbon sensor 9, the control unit determines the amount of hydrocarbons which have been metered in vapour form to the exhaust gas during the desorption mode, so that it can take additional account of this information during control of the desorption mode. When the nitrogen oxide adsorber 3 has been substantially regenerated again, which can be detected, as is known, by means of suitable sensors or with reference to a model estimation from the amount of nitrogen oxides which have previously been adsorbed and have now been released again, the control unit returns the installation to adsorption mode. To do this, inter alia, it closes the shut-off/non-retum valve 10 or switches off the delivery pump.
It has been found that the short-chain hydrocarbons which are preferably contained in the hydrocarbon vapours enable satisfactory desorption of the nitrogen oxide constituents which have previously accumulated in the nitrogen oxide adsorber 3 and also of any accumulated sulphur constituents to take place. The latter constituents may result from the use of sulphur-containing fuels. According to the invention, the regenerating gas 1 required consists of hydrocarbon vapours which, in a simple manner, can be removed from the vapour-chamber area of a liquid fuel tank for the combustion device, preferably with the addition of a pressurecompensating activated-carbon filter container. If the combustion device is a diesel engine, it is alternatively expedient, as well as the associated diesel fuel tank, to provide a separate additional tank containing petrol, from which the corresponding hydrocarbons can be fed in vapour form to the nitrogen oxide adsorber 3 as regenerating gas. As a result of the external metering of hydrocarbon vapours into the exhaust system 2, the regeneration of the nitrogen oxide adsorber 3 can take place independently of the operating point of the combustion device 1, in a defined, desired manner. It has been found that sufficient quantities of hydrocarbons in vapour form to completely regenerate the nitrogen oxide adsorber 3 are generally present in the activatedcarbon filter container 6. During the desorption mode of the nitrogen oxide adsorber 3, the combustion device 1 consequently does not have to be switched over to rich mode, and also a dedicated tank only for the hydrocarbons which are metered from the outside into 8 the exhaust system 2 is also not absolutely necessary. Moreover, the metering of the hydrocarbons in vapour form to the exhaust-gas flow in the exhaust system 2 has the advantage that good, homogeneous, intimate mixing of the metered hydrocarbons with the exhaust gas can be achieved with great case, since the hydrocarbons, which are already in vapour form, pass into the exhaust gas in finely dispersed form, and consequently there is no need for a hydrocarbon supplied in liquid form to be dispersed finely by means of complex nozzles before passing into the exhaust gas. The hydrocarbon vapour is then mixed very easily with the exhaust gas, for which purpose, if necessary, a passive, i.e. static, mixer may be provided in the exhaust system 2 between the metering point 12 and the nitrogen oxide adsorber 3.
9
Claims (8)
1. An exhaust-gas cleaning installation for cleaning the exhaust gas from a combustion device, the installation having a nitrogen oxide adsorber, which in an adsorption operating mode adsorbs nitrogen oxides contained in the exhaust gas supplied and in a desorption operating mode desorbs adsorbed nitrogen oxides, and a hydrocarbon metering device which, during the desorption operating mode, meters hydrocarbons from a source thereof, via a metering line, into the exhaust as fed to the nitrogen oxide Z 9 adsorber, wherein the metering line opens out from a vapour-chamber area of the source and, from there, the hydrocarbon-metering device meters hydrocarbons in vapour form, via the metering line, to the exhaust gas which is fed to the nitrogen oxide adsorber.
2. An exhaust-gas cleaning installation according to Claim 1, wherein the source at the same time forms a fuel tank for the combustion device, and a fuel line is provided, which leads from the tank to the combustion device and via which the combustion device is supplied with liquid hydrocarbons from the tank as fuel.
3. An exhaust-gas cleaning installation according to Claim I or 2, wherein an activated-carbon filter container is arranged in the metering line between an upstream section, which opens out from the source, and a downstream section, which leads onwards to an exhaust-system metering point, which activated-carbon filter container has an air port, via which flushing air can be supplied, which entrains hydrocarbon vapour situated in the activated-carbon filter container into the downstream meteringline section.
4. An exhaust-gas cleaning installation according to Claim 3, wherein a controllable air-delivery pump is provided upstream of the air port of the activated-carbon filter container.
5. An exhaust-gas cleaning installation according to any one of Claims I to 4, wherein the metering line opens out into an exhaust-system section, which feeds the exhaust gas to the nitrogen oxide adsorber, at a metering point comprising a suction point, the suction point being formed by a passive intake configuration.
6. An exhaust-gas cleaning installation according to any one of Claims I to 5, wherein a controllable valve and/or a controllable delivery pump is provided in the metering line.
7. An exhaust-gas cleaning installation according to any one of Claims I to 6, wherein a hydrocarbon sensor is arranged in the metering line.
8. An exhaust-gas cleaning installation for cleaning the exhaust gas from a combustion device, substantially as described herein with reference to, and as illustrated in, the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1999127185 DE19927185A1 (en) | 1999-06-15 | 1999-06-15 | Exhaust gas cleaning system with nitrogen oxide adsorber and hydrocarbon metering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0013354D0 GB0013354D0 (en) | 2000-07-26 |
| GB2351244A true GB2351244A (en) | 2000-12-27 |
Family
ID=7911255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0013354A Withdrawn GB2351244A (en) | 1999-06-15 | 2000-06-01 | Exhaust gas cleaning installation with nitrogen oxide adsorber and hydrocarbon metering |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE19927185A1 (en) |
| FR (1) | FR2794995A1 (en) |
| GB (1) | GB2351244A (en) |
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| US5272873A (en) * | 1991-10-24 | 1993-12-28 | Honda Giken Kogyo Kabushiki Kaisha | Evaporative emission control system for internal combustion engines |
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| GB2303565A (en) * | 1995-07-26 | 1997-02-26 | Ford Motor Co | Exhaust gas treatment |
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| GB2316339A (en) * | 1996-06-26 | 1998-02-25 | Bosch Gmbh Robert | Pipe for evaporating additional fuel into the exhaust gas |
| JPH11229851A (en) * | 1998-02-18 | 1999-08-24 | Hino Motors Ltd | Exhaust gas purifier |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4497012B4 (en) * | 1993-09-21 | 2006-03-30 | Orbital Engine Co. (Australia) Pty. Ltd., Balcatta | Improvements in the catalytic treatment of engine exhaust |
| FR2768184B1 (en) * | 1997-09-05 | 1999-11-05 | Renault | DEVICE FOR BLEEDING CANISTER IN THE EXHAUST DUCT OF A CONTROLLED IGNITION ENGINE |
-
1999
- 1999-06-15 DE DE1999127185 patent/DE19927185A1/en not_active Withdrawn
-
2000
- 2000-06-01 GB GB0013354A patent/GB2351244A/en not_active Withdrawn
- 2000-06-09 FR FR0007426A patent/FR2794995A1/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60117235A (en) * | 1983-11-29 | 1985-06-24 | Fuji Xerox Co Ltd | Original pressing device of image recording device |
| JPS60173660A (en) * | 1984-01-30 | 1985-09-07 | Nippon Telegr & Teleph Corp <Ntt> | Document display processing system |
| JPH03242415A (en) * | 1990-02-21 | 1991-10-29 | Toyota Motor Corp | Exhaust purifier of internal combustion engine |
| US5272873A (en) * | 1991-10-24 | 1993-12-28 | Honda Giken Kogyo Kabushiki Kaisha | Evaporative emission control system for internal combustion engines |
| US5665318A (en) * | 1994-10-12 | 1997-09-09 | Robert Bosch Gmbh | Arrangement for treatment of exhaust gases for a compression-ignition internal combustion engine |
| GB2295334A (en) * | 1994-11-19 | 1996-05-29 | Bosch Gmbh Robert | Removal of NOx from exhaust gases |
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| GB2316339A (en) * | 1996-06-26 | 1998-02-25 | Bosch Gmbh Robert | Pipe for evaporating additional fuel into the exhaust gas |
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Non-Patent Citations (1)
| Title |
|---|
| WPI Abstract AN 1991-359353 [25] & JP3242415 A * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2794995A1 (en) | 2000-12-22 |
| DE19927185A1 (en) | 2000-12-21 |
| GB0013354D0 (en) | 2000-07-26 |
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| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |