Performance and emission characteristics of a turbocharged GNG engine fueled by hydrogen-enriched compressed natural gas with high hydrogen ratio

摘要

This paper investigates the effect of high hydrogen volumetric ratio of 55% on performance and emission characteristics in a turbocharged lean bum natural gas engine. The experimental data was conducted under various operating conditions including different spark timing, excess air ratio (lambda), and manifold pressure. It is found that the addition of hydrogen at a high volumetric ratio could significantly extend the lean bum limit, improve the engine lean burn ability, decrease burn duration, and yield higher thermal efficiency. The CO, CH_4 emissions were reduced and NO_x emission could be kept an acceptable low level with high hydrogen content under lean bum conditions when ignition timing were optimized.