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r <br /> 2208 Y <br /> Ando et p!./Energy 30(2005)2206-1Z18 <br /> Table 1 <br /> Ropesties of gases <br /> Cies 1 Lias 2 Nanaal gas <br /> CO(vot%) 20 7.9 0 <br /> H1(vol%) 12 5.7 0 <br /> C(h(Vol%) 6 0 0 <br /> Nx(vo196) 62 791 0 <br /> C14(401'b) 0 7.2 88.5 <br /> Omer HC(vol%) 0 d 1 is <br /> LHV O=W ms) 912.4 1000 9936 <br /> CP 25.41 13.39 44.52 , <br /> Stoic.an=Dt of air ft"no) 0.762 1.009 10.94 <br /> Combustion potential (CP)of Gas 1 is about 25, and that of Gas 2 is about 13. <br /> CP =K2 H2 +0.6(C.HR +CO)+0.3CH4 <br /> (l) <br /> K2 correction factor adjusted by OZ concentration in fuel <br /> H2,C-A... peacentage content of each gas in fuel <br /> d specific gravity of fuel <br /> F--Iperimeats were carried out by parametrically changing the engine spocd,load,air excess ratio and <br /> ignition timing. For comparison, engine tests operating on natural gas were also carried out. <br /> Compression ratio was $et at 9.4 for Gas 1, 11.9 for Gas 2 and 8.47 for natural gas by considering <br /> combustion stability and engine endurance. <br /> 3.Results and discussions <br /> 3.1. Perfomwnce test results <br /> 3.1.1. WOT testi <br /> To grasp the rough performance of the engine, tests ware carried out initially at wide open throttle <br /> MOT).Fig.2 shows maximum output and brake thermal efficiency as a function of the engine speed. <br /> Compared with the natural gas test results,Gas 1 (hydrogen rich low-BTU gas)driven engine showed <br /> similar thermal efficiency.about 23%.although output was lower.On the other hand,Gas 2(methane <br /> rich low-BTU gas)showed similar output and thermal efficiency with Gas 1 in the range of lower engine <br /> Weeds,but one cannot maintain stable operations at higher engine speeds.In spite of similar charging f <br /> energies of the two gases,performances ars very different.These differences are caused by the difference <br /> of flammability of the two fuels.Combustion of Gas 2 cannot be maintained at higher engine speeds.In <br /> the case of Gas 2,torque fluctuations also increase as engine speed increases. <br /> 3.1.2. Part load tests <br /> Part load operating characteristics of each gas at 2800 ming are shown in Fig. 3. Because ; <br /> natural gas can charge greater energy than Gas 1, use of natural gas achieved greater values of <br /> V <br />