Unlock instant, AI-driven research and patent intelligence for your innovation.

Exhaust gas apparatus and method for the regeneration of a NOX trap and a particle filter

a technology of nox trap and apparatus, which is applied in the direction of exhaust treatment, mechanical apparatus, engine components, etc., can solve the problems of having to re-generate the particle filter and the nox trap in a single operation, and the method of re-generating the particle filter and the nox trap is not availabl

Inactive Publication Date: 2015-04-16
ALFA LAVAL AALBORG
View PDF19 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an exhaust gas cleaning apparatus for cleaning exhaust gas in an exhaust gas conduit. The apparatus includes a NOx trap for removing NOx from the exhaust gas. The apparatus also includes a cold flame vaporizer which can regenerate both the particle filter and the NOx trap in a single operation. The cold flame vaporizer is a standard cold flame vaporizer in which fuel is partially oxidized in preheated air. The apparatus further includes valve means to control the flow of cold flame gas and to shut off the NOx trap when regeneration is needed. The exhaust gas conduit may be a pipe or formed as internal conduits in a larger body. The invention allows for efficient regeneration of the NOx trap and particle filter in a single operation.

Problems solved by technology

Since the regenerating of the particle requires an oxidizing environment while the regenerating of the NOx trap requires a slightly reducing environment, there has not been available a method for regenerating the particle filter and the NOx trap in a single operation.
The problem is, as already mentioned, that the particle filter has to be regenerated under high temperature (600° C.) in an oxidizing environment while the NOx absorber is regenerated at lower temperatures in a reducing environment (500° C. with CO gas).

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Exhaust gas apparatus and method for the regeneration of a NOX trap and a particle filter
  • Exhaust gas apparatus and method for the regeneration of a NOX trap and a particle filter
  • Exhaust gas apparatus and method for the regeneration of a NOX trap and a particle filter

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0070]FIG. 1 illustrates the invention. An exhaust gas flows in an exhaust gas conduit 14 with valve means 18 controlling the flow of exhaust gas through a NOx trap 30.

[0071]There is also provided a cold flame vaporizer 11 with a fuel supply 12, which may be diesel or heavy fuel oil, and an air supply 13. The air supply may be provided with an air intake 15 including an air filter (not shown). Valve means 16, 19 controls the flow of air through fluid line 25 and flow of fuel through fluid line 26 to the cold flame vaporizer 11 respectively.

[0072]When the NOx trap needs to be regenerated, valve means 18 is preferably closed and valve means 17 is opened such that cold flame gas can flow through the NOx trap, thereby regenerating it.

second embodiment

[0073]In FIG. 2a-2c there is shown the invention. Exhaust gas, indicated by arrow 20 on the figure, flows in exhaust gas conduit 14 and through an exhaust conduit section 10 comprising at least a particle filter 30 and a NOx trap 40. Further downstream there is provided an oxidation catalyst 50. The oxidation catalyst could also be placed together with the particle filter 30 and the NOx trap 40.

[0074]The exhaust conduit section 10 is formed with two separate flow paths as can easily be seen on FIGS. 2b and 2c, which illustrate sections through the particle filter 30 and the NOx trap 40 respectively. The two flow paths are formed by a partition 25 dividing the exhaust conduit section 10 in two parts in the longitudinal direction. In each flow path there is provided a particle filter 30 and a NOx trap 40. There is also provided means, like valve means, to control the flow of exhaust gas and cold flame gas through the exhaust conduit section 10.

[0075]There is also provided a cold flame...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Exhaust gas apparatus for the cleaning of exhaust gas where the exhaust gas apparatus comprises an exhaust conduit section which is formed with at least two separate flow paths. Each flow path is provided with a particle filter for the removal of particulate matter from the exhaust gas, an NOx trap for the removal of NOx from the exhaust gas. The exhaust gas apparatus further comprises at least one cold flame vaporizer in which fuel is partially oxidized in preheated air to form a cold flame gas where the cold flame vaporizer is arranged in fluid communication with each of the flow paths in the exhaust conduit section such that the cold flame gas can flow through the particle filter and the NOx trap, and valve means for controlling the flow of cold flame gas from the cold flame vaporizer to each flow path in the exhaust conduit section. Thereby, both the particle filter and the NOx trap in at least one of the flow paths can be regenerated in a single operation. There is also provided a method for regenerating cleaning means for exhaust gas where the cleaning means comprises an NOx trap and possibly a particle filter.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation application of U.S. Ser. No. 12 / 675,400, filed Feb. 26, 2010, which was a National Stage application of PCT / NO2008 / 000310 filed Sep. 1, 2008, and claims the benefit of U.S. Provisional application 60 / 968,899 filed Aug. 30, 2007.BACKGROUND[0002]The present invention relates to apparatus for regenerating a NOx trap and the regeneration of a particle filter and a NOx trap in a single operation. The invention is also related to a method for the regeneration of a NOx trap and a method for regenerating a particle filter and a NOx trap in a single operation. The invention further relates to the use of the apparatus and the methods with a compression ignition engine, i.e. what is often called a diesel engine.[0003]The cold flame is a phenomenon which has so far not received to much attention. In a cold flame the fuel is partially oxidized in preheated air and the temperature is kept constant at about 450° C., an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): F01N3/08F01N3/30F01N3/025
CPCF01N3/0821F01N3/0253F01N3/306F01N2610/00F01N2270/04F01N2250/02F01N2250/04F01N3/023F01N3/025F01N3/0842F01N3/36F01N2240/30Y02T10/12
Inventor OVREBO, DAGLUCKA, KLAUSVON SCHLOSS, HEIDI POHLAND
Owner ALFA LAVAL AALBORG