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Dynamic Control of Prox Bed Space Velocity

IP.com Disclosure Number: IPCOM000176312D
Publication Date: 2008-Nov-12
Document File: 1 page(s) / 8K

Publishing Venue

The IP.com Prior Art Database

Abstract

Dynamically controlling the open cross sectional area of the prox catalyst bed to minimize back shift. An area of the bed face can be partially masked by some structure at low flow rates.

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Title:

Dynamic Control of Prox Bed Space Velocity    

Abstract:

Dynamically controlling the open cross sectional area of the prox catalyst bed to minimize back shift.  An area of the bed face can be partially masked by some structure at low flow rates.

 

Disclosure:

At low space velocities, some Prox catalyst beds backshift and create CO.  At high turndown, a prox bed can have an exit CO concentration higher than at full power due to the backshifting.

A solution is to dynamically control the open cross sectional area of the prox catalyst bed.  An area of the bed face can be partially masked by some structure at low flow rates.  Because the bed is partially masked gas can only flow over a defined section of the catalyst, thus maintaining a relatively constant space velocity in the bed.  The control, either active or passive, would open the entire bed at full flow rates, then close off portions of the bed incrementaly or continuously to keep the effective space velocity relatively constant.  The increased space velocity at low power would keep the performance similar to high power and eliminate backshifting

 If a powerplant needs to have large turndown ratios, such as an automotive powerplant, some catalysts may be excluded due to poor low power performance.  This solution would allow for the use of these catalysts under high turndown conditions.