TY - JOUR
T1 - Cycle efficiency and gaseous emissions from a diesel engine assisted with varying proportions of hydrogen and carbon monoxide (synthesis gas)
AU - Bika, Anil Singh
AU - Franklin, Luke
AU - Kittelson, David
PY - 2011
Y1 - 2011
N2 - This study investigates the combustion and emissions of a compression ignition (CI) engine operating with mixtures of hydrogen (H2) and carbon monoxide (CO) injected with the intake air. Hydrogen and carbon monoxide were chosen as the gaseous fuels, because they represent the main fuel component of synthesis gas, which can be produced by a variety of methods and feed stocks. However, due to varying feed stock and production mechanisms, syngas composition can vary significantly. It is currently unknown how a varying H 2/CO (syngas) ratio affects the cycle efficiency and gaseous emissions. The experiments were performed on an air-cooled, naturally aspirated, direct injection diesel engine. The engine was operated at 1800 RPM with a compression ratio of 21.2:1. Two load conditions were tested; 2 bar and 4 bar net indicated mean effective pressure (IMEPn). For all test conditions the added syngas demonstrated lower cycle efficiency than the diesel fuel baseline. The lower cycle efficiency is thought to directly come from the amount of unburned syngas escaping with the exhaust gases. For the 2 bar IMEPn condition the NOx emissions remained relatively constant for all conditions tested, however for the 4 bar IMEPn condition, the NOx emissions increased with diesel fuel substitution for all H2/CO proportions. The NO2/NOx ratio was found to significantly increase for all conditions tested, compared to the diesel base case. It is speculated that this increase is caused by the increase in HO2 radicals which increases the NO to NO2 conversion.
AB - This study investigates the combustion and emissions of a compression ignition (CI) engine operating with mixtures of hydrogen (H2) and carbon monoxide (CO) injected with the intake air. Hydrogen and carbon monoxide were chosen as the gaseous fuels, because they represent the main fuel component of synthesis gas, which can be produced by a variety of methods and feed stocks. However, due to varying feed stock and production mechanisms, syngas composition can vary significantly. It is currently unknown how a varying H 2/CO (syngas) ratio affects the cycle efficiency and gaseous emissions. The experiments were performed on an air-cooled, naturally aspirated, direct injection diesel engine. The engine was operated at 1800 RPM with a compression ratio of 21.2:1. Two load conditions were tested; 2 bar and 4 bar net indicated mean effective pressure (IMEPn). For all test conditions the added syngas demonstrated lower cycle efficiency than the diesel fuel baseline. The lower cycle efficiency is thought to directly come from the amount of unburned syngas escaping with the exhaust gases. For the 2 bar IMEPn condition the NOx emissions remained relatively constant for all conditions tested, however for the 4 bar IMEPn condition, the NOx emissions increased with diesel fuel substitution for all H2/CO proportions. The NO2/NOx ratio was found to significantly increase for all conditions tested, compared to the diesel base case. It is speculated that this increase is caused by the increase in HO2 radicals which increases the NO to NO2 conversion.
UR - http://www.scopus.com/inward/record.url?scp=84877164476&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84877164476&partnerID=8YFLogxK
U2 - 10.4271/2011-01-1194
DO - 10.4271/2011-01-1194
M3 - Conference article
AN - SCOPUS:79959831737
SN - 0148-7191
JO - SAE Technical Papers
JF - SAE Technical Papers
T2 - SAE 2011 World Congress and Exhibition
Y2 - 12 April 2011 through 14 April 2011
ER -