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2216 Y.Antic et aL!$%"V 30(2003)2206-2218 <br /> 700 <br /> 600 <br /> --eawMI plap2appmin <br /> NO <br /> 400 1 <br /> 1 <br /> 300 <br /> 200 l <br /> i <br /> 100 <br /> 0 <br /> 0.5 1 1.5 2 <br /> AkExomRsdo <br /> Ptg IS.l3tferxs of air exem natio on CA enrrisdan. <br /> As a whole,benefits of hydrogen combustion and disadvantages of diluted medume combustion are <br /> remarkable. <br /> 3.3. Exhaust emission measurements <br /> NO,emission and exhaust temperature as a function of combustion equivalence ratioare shown in <br /> Figs. 13 and 14. NO emissions from engine operating on Gas 1 and pas 2 are remarkably low. The <br /> reason for this behaviour is that the combustion tCO40 aOM are low as indicated by the measured <br /> exhaust temperatures. Additionally, oxygen concentration in the gas mixture is low owing to small <br /> stoichiometric amount of air, so there might be small localized high-temp mare regions in the <br /> combustion chamber, i.e. low-BTU gas combustion gives similar effects such as exhaust gas <br /> recirculation(EOR). <br /> Emissions of CO and HC as a function of the equivalence natio are shown in Fags. 15 and 16.For Gas <br /> 1, the increase of CO measured on the fuel-rich aide is caused by discharge of unburned species. It is <br /> 21f00A. a <br /> 120 .2000011.1 <br /> 100 AT <br /> so <br /> 60 <br /> 40 1 <br /> 20 <br /> 0 <br /> 5 1 i.5 2 <br /> AirExcouPolo <br /> Fig. I6.Etii xu of air exeeaa redo on HC emitsiamr. <br />