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http://dx.doi.org/10.3795/KSME-B.2013.37.5.473

Effect of Compression Ratio Change on Emission Characteristics of HCNG Engine  

Lee, Sung Won (Korea Institute of Machinery and Materials)
Lim, Gi Hun (Dept. of Environment & Energy Mechanical Engineering, University of Science and Technology)
Park, Cheol Woong (Korea Institute of Machinery and Materials)
Choi, Young (Korea Institute of Machinery and Materials)
Kim, Chang Gi (Korea Institute of Machinery and Materials)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.5, 2013 , pp. 473-479 More about this Journal
Abstract
This study focused on a heavy-duty natural gas engine fuelled with HCNG (CNG: 70 vol%, hydrogen: 30 vol%) and CNG. To study the emission characteristics of an HCNG engine with high compression ratio, the exhaust gas of CNG and HCNG fuel were analyzed in relation to the change in the compression ratio at the half load condition. The results showed that the thermal efficiency improved with an increase in the compression ratio. Consequently, $CO_2$ emission decreased. CO emission increased with inefficient oxidation due to the low exhaust gas temperature. $NO_x$ emission with high compression ratio was increased at the same excess air ratio condition. However, $NO_x$ emission was not affected by a compression ratio exceeding ${\lambda}$ = 1.9 because of the same MBT timing.
Keywords
Compression Ratio; Hydrogen Natural Gas Blend(HCNG); Emission Characteristics; Heat Release Ratio; Excess Air Ratio;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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