Methane enrichment of syngas (H2/CO) in a spark-ignition direct-injection engine: Combustion, performance and emissions comparison with syngas and Compressed Natural Gas
Methane enrichment of syngas (H2/CO) in a spark-ignition direct-injection engine: Combustion, performance and emissions comparison with syngas and Compressed Natural Gas
复制标题
DOI：
10.1016/j.energy.2015.07.031
复制
发表时间：
2015-10
期刊：
影响因子：
9
通讯作者：
F. Hagos;A. A. Aziz-A.;S. Sulaiman
中科院分区：
文献类型：
--
作者：
F. Hagos;A. A. Aziz-A.;S. Sulaiman
由固体燃料气化产生的合成气可以最好地用作内燃机中从碳基燃料到氢基燃料的过渡燃料。唯一的缺点是它的热值低，只有CNG（压缩天然气）的十分之一到五分之一。这导致在DI（直接喷射）SI（火花点火）发动机中更高的BSFC（制动比燃料消耗）和在晚喷射定时处对喷射持续时间的限制。最近，已经努力使合成气富含甲烷，从而可以提高热值。本文介绍了合成气富甲烷对直喷式柴油机燃烧、性能和排放影响的试验结果。结果表明，在发动机转速相同的情况下，富甲烷合成气（MES）比合成气和天然气（CNG）的运行过量空气系数（λ）有所提高。甲烷富集保持了更快和更平稳的燃烧，一氧化碳和总碳氢化合物的制动排放量较低，以及合成气中观察到的氮氧化物的制动排放量较高。此外，MES使最大制动热效率和合成气的BSFC分别提高了30.2%和21.3%。因此，在直喷式柴油机中，MES可以在所有负荷条件下更好地替代CNG。
Syngas produced from gasification of solid fuels can serve best as transition fuel from the carbon-based to the hydrogen-based fuels in the internal combustion engines. The lone drawback is its low calorific value being between one tenth and one fifth of that of CNG (Compressed Natural Gas). This results in higher BSFC (brake specific fuel consumption) and limitation on the injection duration at late injection timings in the DI (direct-injection) SI (spark-ignition) engine. Recently, there have been efforts to enrich the syngas with methane so that the calorific value can be improved. This paper presents experimental results on the effect of methane-enrichment of syngas on the combustion, performance and emissions in the DISI engine. The result shows that the MES (methane-enriched syngas) has extended the operation excess air ratio (λ) compared to syngas and CNG at the same engine speed. Methane-enrichment has maintained the faster and smoother combustion, the lower brake emissions of carbon monoxide and total hydrocarbon, and higher brake emissions of nitrogen oxides observed with syngas. Besides, MES improved the maximum brake thermal efficiency and the BSFC of the syngas by 30.2% and 21.3%, respectively. Therefore, MES can be better replacement to CNG in the DISI engine at all load conditions.