Exhaust gas aftertreatment system for a vehicle operated by means of a combustion engine, in particular for a watercraft

Patent metadata

Field	Value
Publication number	US-9714593-B2
Application number	US-201514957839-A
Country	US
Kind code	B2
Filing date	Dec 3, 2015
Priority date	Dec 3, 2014
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

An exhaust gas aftertreatment system for a vehicle operated by a combustion engine, in particular for a watercraft, includes a turbine of an exhaust turbocharger in an exhaust line, and at least one storage device, by which at least some of the sulphur pollutants contained in the exhaust gas can be stored and/or put into intermediate storage, at least for a defined period of time. According to the invention, particularly for storing the sulphur pollutants in the high-pressure region, the at least one storage device is arranged in the exhaust line upstream of the at least one turbine in a high pressure region of the exhaust line.

First claim

The invention claimed is:

1. An exhaust gas aftertreatment system for a vehicle operated by a combustion engine comprising:
a turbine of an exhaust gas turbocharger, arranged in an exhaust line of the combustion engine, wherein the exhaust line is designed as a high-pressure region upstream of the turbine and as a low-pressure region downstream of the turbine, as seen in the direction of the exhaust gas flow, said low-pressure region being at a lower pressure than the high-pressure region, and
at least one storage device in which a sulphur pollutant contained in exhaust gas of the exhaust gas flow is at least one of stored and put into intermediate storage, for a defined period of time, wherein for storing the sulphur pollutants in the high-pressure region, the at least one storage device is arranged in the exhaust line upstream of the at least one turbine;
wherein the at least one storage device is one of:
a sorption element, by which the sulphur pollutants can be sorbed, the storage device being made of a sorption material or coated with a sorption material; or
a filter element with a storage container storing a reagent and a feed device supplying the reagent from the storage container to the exhaust gas upstream of the filter element, the reagent converting the sulphur pollutant contained in the exhaust gas into solids.

2. The exhaust gas aftertreatment system according to claim 1 , wherein the vehicle is a watercraft.

3. The exhaust gas aftertreatment system according to claim 1 , wherein the at least one storage device is the sorption element.

4. The exhaust gas aftertreatment system according to claim 1 , wherein the at least one storage device is the filter element filtering out and storing the sulphur pollutant converted into solids out of the exhaust gas flow.

5. The exhaust gas aftertreatment system according to claim 4 , further comprising an SCR catalyst, wherein the reagent is ammonia or a precursor of ammonia and is fed to the SCR catalyst by the feed device.

6. The exhaust gas aftertreatment system according to claim 5 , wherein the at least one storage device includes the SCR catalyst.

7. The exhaust gas aftertreatment system according to claim 5 , further comprising a single feed region feeding the reagent into the exhaust gas to both the storage device and the SCR catalyst, the SCR catalyst being arranged in the exhaust line downstream of the storage device.

8. The exhaust gas aftertreatment system according to claim 7 , wherein the feed region is arranged in the exhaust line upstream of at least one of the turbine and the storage device.

9. The exhaust gas aftertreatment system according to claim 1 , wherein the exhaust line includes an exhaust gas recirculation system feeding back the exhaust gas to the combustion engine, and the storage device is arranged in at least one of the exhaust gas recirculation system and the exhaust line upstream of the exhaust gas recirculation system.

10. The exhaust gas aftertreatment system according to claim 1 , further comprising an extraction device extracting or removing the stored sulphur pollutant from the exhaust line and a reactor device, wherein the extracted or removed sulphur pollutants are fed to the reactor device, in which the sulphur pollutant is converted into a defined substance.

11. The exhaust gas aftertreatment system according to claim 10 , wherein the exhaust line includes two exhaust line parts through which the exhaust gas flows in parallel, at least one storage device is arranged in each of exhaust line parts, and in that, for fluidic decoupling of the exhaust line parts from the exhaust gas flow, the extraction device includes a decoupling valve device, which decouples neither of the two exhaust line parts in a first valve position, decouples a first of the two exhaust line parts in a second valve position, and decouples a second of the two exhaust line parts in a third valve position.

12. The exhaust gas aftertreatment system according to claim 11 , wherein the extraction device includes at least one relief valve device relieving the exhaust line parts of pressure, wherein the at least one relief valve device relieves neither of the two exhaust line parts in a first valve position, relieves the first of the two exhaust line parts in a second valve position, and relieves the second of the two exhaust line parts in a third valve position.

13. The exhaust gas aftertreatment system according to claim 12 , wherein the extraction device has at least one connecting element connected between the exhaust line parts upstream of the at least one storage device of each of the exhaust line parts, and a connecting valve device that selectively connects the exhaust line parts to the reactor device, the connecting valve device shuts off the exhaust gas flow through the connecting element in a first valve position, enables the exhaust gas flow from the first of the two exhaust line parts towards the reactor device in a second valve position, and enables the exhaust gas flow from the second of the two exhaust line parts towards the reactor device in a third valve position.

14. The exhaust gas aftertreatment system according to claim 12 , wherein the extraction device has a bypass device connected between the exhaust line parts upstream of a connecting region of the exhaust line parts, and a bypass valve device in the bypass device that shuts off the exhaust gas flow through the bypass device in a first valve position and at least partially enables the exhaust gas flow through the bypass device in a second valve position.

15. The exhaust gas aftertreatment system according to claim 13 , wherein the extraction device has at least one delivery device delivering exhaust gas from the exhaust line parts to the reactor device via the at least one connecting element.

16. The exhaust gas aftertreatment system according to claim 10 , wherein the reactor device includes at least one of a pollutant scrubber, a fixed bed reaction element, and a cooling device and a condensation device for cooling and condensing the sulphur pollutant.

17. The exhaust gas aftertreatment system according to claim 10 , further comprising a bypass device feeding back the reagent separated from the sulphur pollutant and removed from the exhaust line to the exhaust gas upstream of the at least one storage device.

18. The exhaust gas aftertreatment system according to claim 1 , further comprising at least one of a measurement device and a control device that determines a quantity of the sulphur pollutant stored in the storage device using at least one of a sensor system and a simulation model.

19. A method for operating an exhaust gas aftertreatment system for a vehicle operated by a combustion engine, wherein the exhaust gas aftertreatment system includes a turbine of an exhaust gas turbocharger, arranged in an exhaust line of the combustion engine, wherein the exhaust line is designed as a high-pressure region upstream of the turbine and as a low-pressure region downstream of the turbine, as seen in the direction of the exhaust gas flow, said low-pressure region being at a lower pressure than the high-pressure region, and at least one storage device in which a sulphur pollutant contained in exhaust gas of the exhaust gas flow is at least one of stored and put into intermediate storage, for a defined period of time, wherein for storing the sulphur pollutants in the high-pressure region, the at least one storage device is arranged in the exhaust line upstream of the at least one turbine, wherein the at least one storage device is

Assignees

• Man Truck & Bus Ag

Inventors

• Döring Andreas

Classifications

• F01N2610/02

  the substance being ammonia or urea · CPC title

• F01N2900/1622

  Catalyst reducing agent absorption capacity or consumption amount · CPC title

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title

• F01N3/085 Primary

  Sulfur or sulfur oxides · CPC title

• F01N3/0885

  Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps · CPC title