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The aim of this work is to study the combustion and gaseous emissions characteristics of a diesel engine dual-fueled with natural gas at different operating conditions (light to full load) for generator application. The electromechanical system was composed of a commercially available 18 liter, 6-cylinder diesel engine, coupled with the generator rated at 600 kWe at full-load. The flow of natural gas was electronically controlled using a throttle valve, and was inducted in the intake manifold before being introduced into the combustion chambers. Gaseous emissions of carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx) were measured under both diesel and dual fuel operations at different loads. This work also presents the effects of diesel oxidation catalyst to reduce HC and CO emissions under dual fuel operation. At each operating load, gas percentage was increased with corresponding decrease in diesel pilot while maintaining the same power output.

In this paper results are given from single-cylinder, steady-state engine tests using the Texaco Diesel Additive (TDA) as an in-fuel emission reducing agent. The data include NOx, total unburned hydrocarbons, indicated specific fuel consumption, and heat release analysis for one engine speed (1500 RPM) with two different loads (Φ ≈ 0.3, IMEP = 0.654 MPa and Φ ≈ 0.5, IMEP = 1.006 MPa) using the baseline fuel and fuels with one percent and five percent additive by weight. The emissions were measured in the exhaust stream of a modified TACOM-LABECO single cylinder engine. This engine is a 114 mm x 114 mm (4.5″ x 4.5″) open chamber low swirl design with a 110.5 MPa (16,000 psi) peak pressure Bosch injector. The injector has 8 holes, each of 0.2 mm diameter. The intake air was slightly boosted (approximately 171 kPa (25 psia)) and slightly heated (333 K (140 °F)). In previous research on this engine the emissions, including soot, were well documented.