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2210 Y.Ando et a4 Energy 3o(1005)z2o6-221g <br /> s 70"S--clas 12&kg.BTDc _ <br /> 4 --t—Gu2 ildeg.BTDC I 6D <br /> 3 so <br /> 2 40 <br /> 1 30 <br /> 0 ♦�I <br /> 20 <br /> "1 4r + 10 i <br /> -2 0 <br /> 0 2 4 6 B 10 <br /> Energy IRPA[kWl <br /> Pig.4.Part load ptalbrmanees at 1.0 air excess retia,engine speed=2000 min-,. <br /> engines and gas engines are typically less than 2=1.5. The main factor which causes this wide <br /> stable operation range is the very wide flammability range of hydrogen. In an actual gasification <br /> system, composition of the product gas might fluctuate, :exulting in fluctuations in the air excess <br /> ratio. However, engines operating on gases such as Gas l can easily tolerate those fluctuations. <br /> On the other hand, engine operation on Gas 2 shows very narrow stable range in spite of similar <br /> performance at stable air excess ratio. Fig. 6 shows combustion efficiency calculated from <br /> exhaust gas composition. This figure indicates that thermal efficiency is governed by combustion <br /> efficiency. Gas 2 has narrow stable engine operating range on the lean AIF side and stable <br /> operation cannot be realized outside of this range. Since the range of stable air excess ratio is very <br /> narrow. the engine's startability is also poor and starting operations require severe adjustments of <br /> the air—fuel ratio. <br /> 30 -A—Mt.,,gas <br /> 25 <br /> is <br /> 10 <br /> s <br /> 0 <br /> 0.5 i l.s 2 <br /> Air facts:~Ratio <br /> Pig.5.Effects of air excess ratio on brake thermal daciency. <br />