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Method for Purge and H2 for Hydrogen Desulfurizer

IP.com Disclosure Number: IPCOM000206097D
Publication Date: 2011-Apr-13
Document File: 3 page(s) / 174K

Publishing Venue

The IP.com Prior Art Database

Abstract

Hydrogen for an HDS is generated from the reformate using a PSA unit. This obviates the need for HDS purge.

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Title:

Method for Purge and H2 for Hydrogen Desulfurizer

Abstract:

Hydrogen for an HDS is generated from the reformate using a PSA unit.  This obviates the need for HDS purge.

 

Discussion:

In a current fuel processing system, the N2 purge process takes approximately 3 minutes with a 3 minute fuel purge.  This purge is to remove any oxygen in the main and mini CPO's.  This long purge time tends to cool down the bed catalysts.  Therefore, to have consistent startups, it requires additional heat up periods after the purge.

See attached figures (Figure 1. current system, Figure 2. proposed system).  The proposal in figure 2 is to generate the required hydrogen for the hydrogen desulfurizer (HDS) from a slip stream in the reformate outlet utilizing a high hydrogen purity Pressure Swing Adsorption (PSA) unit.  A controlled amount of hydrogen can be processed, stored and regulated to the HDS.   A benefit associated with this method of hydrogen processing for the HDS is that there would be no requirement for a HDS purge since there would be no air, CO, CO2 and/or water in the HDS that is currently due to the mini-CPO setup.  The HDS is a large volume and requires a significant amount of time to ensure a complete purge.  Additionally, the HDS could be resized to a small scale due to the lack of air, CO, CO2 and/or water.

The new purge point would be located at the main CPO air inlet.  See Table 1 in the attached drawings for the proposed startup/shutdown sequences.  The pu...