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Process design and performance of a microstructured convective steam–methane reformer

Paper ID Volume ID Publish Year Pages File Format Full-Text
55637 47060 2011 8 PDF Available
Title
Process design and performance of a microstructured convective steam–methane reformer
Abstract

We describe the design and operation of a microstructured steam–methane reformer in which the heat transfer area and reaction volume demands for the reforming process are decoupled to yield a high degree of process intensification relative to conventional tubular reformer design. The plant design incorporates intensive process integration without steam export. With 80% hydrogen recovery from the syngas in a PSA, and use of the PSA offgas as the only fuel source, the reformer system has a fuel energy efficiency of 78.6% as designed, corresponding to a hydrogen production rate of 2.69 mol H2 per mol NG.Based on printed-circuit heat exchanger techniques, the demonstration plant incorporates 17 stages of reforming at nominally 15 bar. Heating for the individual adiabatic stages is provided by combustion stages and by flue-gas heat recovery. The plant incorporates design features to minimise potential for carbon deposition and metal dusting. It displays intrinsic autoregulation over a wide range of turn-down, from 34% to 125%. Start-up is very rapid, approximately 2 h from cold to syngas production at full rate.With these features, this process and plant design is well suited for standalone operation, for example to substitute for merchant hydrogen delivery in small or isolated facilities. While the present plant has a capacity of 5 Nm3 H2 h−1, the multichannel printed circuit architecture is scalable without loss of precision to very large throughputs.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (345 K)Download as PowerPoint slideHighlights► Design and 1000-h demonstration of highly integrated, intensified microchannel convective steam–methane reformer operating at 15 bar. ► System employs supported noble metal catalysts for reforming, combustion and water gas shift. ► Design to minimise potential for carbon deposition and metal dusting ► Intrinsic autoregulation minimises need for active control over wide range of turndown. ► Printed circuit heat exchanger manufacturing technique provides scaleability.

Keywords
Printed circuit heat exchanger; Process integration; Scalability; Autoregulation
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Process design and performance of a microstructured convective steam–methane reformer
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 178, Issue 1, 15 December 2011, Pages 34–41
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us