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2 Journal of KONES

2 1998

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Relationship between natural gas characteristics and performance of heavy duty engines

Corbo P., Gambino M., Iannaccone S.

Journal of KONES

1998

Vol. 5, No. 1

72-78

The present paper analyses in details the effects of natural gas (NG) composition variability, due to different NG sources, on engine performance and emissions. The application of this study is to give indications useful for designing, realising, and homologation of heavy duty engines fuelled with NG. The effects of fuel properties have been investigated by experimental tests carried out on heavy duty engine fuelled with different mixtures NG/Ni. In addition, general formulas for the computation of power and air/fuel ratio as a function of fuel physico-chemical properties have been determined. Therefore an useful parameter (Shift Index) for quantification of air/fuel (A/F) ratio variability connected to different fuel compositions has been defined and discussed. The global examination of above topics suggested that self-adapting closed-loop feed control systems have the potentiality to compensate the fuel variability. The different properties of the NG mixtures widely diffused on European market have been examined and discussed.

DeNox catalysts at the exhaust of a spark ignition natural gas engine operating in lean conditions

Ciambelli P., Corbo P., Gambino M., Migliardini F., Iannaccone S.

Journal of KONES

1998

Vol. 5, No. 1

45-51

In the present paper the catalytic properties of two different systems in the NOx reduction at the exhaust of a natural gas lean-burn engine are analysed. The proposed approach consists in using methane present in the exhaust as reducing agent. In particular, a sample of ferrierite zeolite modified with cobalt is compared with a platinum catalyst supported on gamma-Al2O3. Cobalt-ferrierite catalyst resulted much more active with respect to Pt-gamma-Al2O3 in dry exhaust conditions, but a strong inhibiting effect of water on NOx catalytic reduction was detected.