Abstract
To investigate the idle performance of a HCNG with high hydrogen blend ratios, the effects of different excess air ratios (λ) and different hydrogen blend ratios on combustion, indicated thermal efficiency (ITE) and emissions of a 6-cylinder CNG engine were investigated. The results show that, with the increase of hydrogen blend ratio, rather high ITE can be achieved in a much wider range of λ. Under conditions of λ=1.2~1.4, emissions of CH4, NMHC and CO are relatively low for different hydrogen blend ratios. When the hydrogen blend ratio is greater than 75%, emissions of CH4, HMHC and CO increase only slightly with the increase of λ. NOx emissions increase with the increase of hydrogen blend ratio. And these emissions reach their peaks for different hydrogen blend ratios under the conditions of λ=1.1-1.2.
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