Browse Prior Art Database

Rotary Valve for Continuous Regeneration of NOx Absorber Bed

IP.com Disclosure Number: IPCOM000206107D
Publication Date: 2011-Apr-13
Document File: 3 page(s) / 592K

Publishing Venue

The IP.com Prior Art Database

Abstract

A rotational valve separates syngas and engine exhaust flows and introduces syngas to a set percentage of a single NOx absorber bed, allowing for one catalyst bed and one valve to be used.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 66% of the total text.

Title:

Rotary Valve for Continuous Regeneration of NOx Absorber Bed

Abstract:

A rotational valve separates syngas and engine exhaust flows and introduces syngas to a set percentage of a single NOx absorber bed, allowing for one catalyst bed and one valve to be used.

 

Discussion:

To regenerate a diesel engine NOx adsorber with Syngas it is preferable to run the reformer continuously instead of on/off.  This makes the reformer smaller and easier to control.  To make use of these advantages the syngas needs to be introduced to the adsorber bed continuously but without mixing with engine exhaust. Currently this is done with two catalyst beds and valves to direct the flows to each bed.  This creates a very large and expensive after treatment system.

The proposed solution is a rotational valve that separates the syngas and engine exhaust flows and introduces syngas to a set percentage of a single NOx adsorber bed, allowing for one catalyst bed and one valve to be used.  The features of the valve are a body that rotates a wedge supplied by syngas around the central axis of the catalyst bed.  One revolution of the valve will expose the entire bed to syngas.  If the valve is placed on the surface of the catalyst it could rotate continuously or incrementally, and if it is placed upstream it could rotate incrementally, supplying discrete sections of catalyst at a time, rotating quickly in between sections.

    The valve body could be made of ceramic material.  All other materi...