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Use Of Cryogenic Nitrogen Generator For Oxygen Enrichment Of Air

IP.com Disclosure Number: IPCOM000016609D
Publication Date: 2003-Jul-03
Document File: 3 page(s) / 342K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure proposes to supply oxygen-enriched air by injecting waste gas from a modified Cryogenic Nitrogen Generator. In order to minimise non-standard costs only minor modifications are implemented, such as: 1) use of a portion of the pure nitrogen product to regenerate the front-end adsorption beds; 2) use of a nitrogen expander to provide refrigeration; 3) use of nitrogen expansion energy to drive the compression of the oxygen enriched air.

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Use Of Cryogenic Nitrogen Generator For Oxygen Enrichment Of Air

Abstract

This disclosure proposes to supply oxygen-enriched air by injecting waste gas from a modified Cryogenic Nitrogen Generator.� In order to minimise non-standard costs only minor modifications are implemented, such as: 1) use of a portion of the pure nitrogen product to regenerate the front-end adsorption beds; 2) use of a nitrogen expander to provide refrigeration; 3) use of nitrogen expansion energy to drive the compression of the oxygen enriched air.

Body

Many industrial processes require oxygen-enriched air to increase their capacity, productivity, or conversion rate. An example of such is the de-bottlenecking of Fluid Catalytic Cracking (FCC) Regenerators in refineries by oxygen enriching the compressed air from a blower to the regeneration reactors.

Traditionally air enrichment has been accomplished by injecting a pure oxygen stream into an (often existing) compressed air stream up to a value governed by process/safety limits - typically 26%. This pure oxygen is often produced by on-site Cryogenic Oxygen Generators.

This disclosure proposes to supply oxygen-enriched air by injecting waste gas from a modified Cryogenic Nitrogen Generator (see Figure 1) into an (often existing) compressed air stream. Oxygen concentrations in this waste gas are typically between 35% and 40%.

In order to minimise non-standard costs only the following minor modifications to standard plants (see Figure 2) are proposed.

A)    Use of (part of) the pure nitrogen product - rather than the waste - to regenerate the front-end Temperature Swing Absorber (TSA) beds in order to avoid purity fluctuations and pressure loss in the waste stream. Also, in this way the waste stream remains dry and non-acidic which may be required for downstream processes like compression.

B)     Use of (part of) the pure nitrogen product - rather than the waste - to provi...