Performance and exhaust emissions test results from a liquid propane injected engine with hydrogen enrichment

Abstract

Abstract

This paper investigates the effect of performance and exhaust emissions test results from a liquid propane injected engine with hydrogen enrichment. In order to research this topic, the test engine was run at 1400 rpm with a compression ratio of eight. Relative air—fuel varied between 0.8 and 1.3. CO emissions decreased with the addition of hydrogen, but the oxygen amount decreased around the rich and stoichiometric air—fuel ratio as the hydrogen supplement rate increased. CO emissions decreased with the increase in the hydrogen supplement rate. Total hydrocarbon emissions decreased as hydrogen was added in the rich and around stoichiometic air—fuel ratio. NO_x emissions were maximum at around λ = 1.2 and the addition of 20 per cent hydrogen resulted in about a 20 percent increase in the amount of NO x emissions compared to that of pure LPG combustion. Power and thermal efficiency increased with the decrease of the hydrogen supplement rate.