Numerical optimization and reaction flow analysis of syngas production via partial oxidation of natural gas in internal combustion engines

The production of hydrogen is studied numerically under uncatalyzed partial oxidation and homogeneous charge compression ignition (HCCI) conditions in an internal combustion engine fueled by natural gas. The HCCI process is modeled by a single-zone variable volume reactor using a global heat transfe...

Full description

Saved in:
Bibliographic Details
Published in:International journal of hydrogen energy 2015-09, Vol.40 (34), p.11046-11058
Main Authors: Gossler, H., Deutschmann, O.
Format: Article
Language:English
Subjects:
Hydrogen
Internal combustion engine
Natural gas
Optimization
Partial oxidation
Syngas
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The production of hydrogen is studied numerically under uncatalyzed partial oxidation and homogeneous charge compression ignition (HCCI) conditions in an internal combustion engine fueled by natural gas. The HCCI process is modeled by a single-zone variable volume reactor using a global heat transfer model and elementary-step reaction mechanisms. Numerical optimization is applied to maximize the hydrogen yield at the end of the expansion stroke by varying the equivalence ratio, engine speed and initial pressure for a fixed initial temperature. Suitable constraints were defined, including peak pressure and bounds to the optimization variables. From these results, maximum hydrogen yield profiles and the associated operating parameter profiles as functions of initial temperature were obtained. The profiles exhibit strong linear dependency with initial temperature. Reaction flow analysis was performed to gain detailed insight into the chemical processes involved when the engine is run under optimal conditions for a maximum hydrogen yield. The integral reaction flow analysis shows that substantial amounts of hydrogen are produced from precursors, which are also valuable products, such as methanol, formaldehyde and ethylene. [Display omitted] •Numerical study on hydrogen production in internal combustion engines.•Simulation: Single-zone model with global heat transfer, detailed reaction mechanism.•Numerical optimization to determine optimal operating conditions for max. H2 yield.•Reaction flow analysis provides detailed insight into chemical conversion process.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2015.06.125