On-Board Hydrogen Generator for a Partial Hydrogen Injection Internal Combustion Engine

Document Number: 740600

Date Published: February 1974

Author(s):
John Houseman - California Institute of Technology
D. J. Cerini - California Institute of Technology

Abstract:
A compact onboard hydrogen generator has been developed for use with a hydrogen-enriched gasoline internal combustion engine. The unit uses gasoline and air in a partial oxidation reactor to produce a gaseous product containing hydrogen, carbon monoxide, minor amounts of methane, carbon dioxide and water, and nitrogen. A study of the theoretical equilibrium product composition has indicated an optimum operating point at an air/fuel ratio of 5.15, where a hydrogen/fuel mass ratio of 0.136 can be obtained under soot-free conditions. This is based on a gasoline with an atomic hydrogen to carbon ratio of 1.92.

Both thermal and catalytic reactors have been tested. The thermal unit requires a reaction temperature of 2400\mDF to obtain 80% of the theoretical hydrogen yield. Soot formation tends to be a problem. The catalytic reactor yields close to theoretical yields at an operating temperature of 1800\mDF without any soot formation. A commercial nickel catalyst is used. A 100 h test with the catalytic unit showed no signs of performance degradation, using fully leaded Indolene 30.

The calculated effect of hydrogen generator operating conditions on the fuel efficiency of a generator/engine combination is presented.

Product Status: In Stock

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