A Review of the Effect of Compressed Natural Gas (CNG) on Combustion and Emission Performance of Internal Combustion Engines

Yufan Liang
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Abstract

In order to reduce the environmental pollution caused by conventional internal combustion engines, the application of natural gas in internal combustion engines and the combustion and emission performance of natural gas internal combustion engines have been widely studied by scholars. Because the physical and chemical properties of natural gas are different from those of conventional gasoline or diesel, the operating performance of natural gas internal combustion engines in practical applications is also different from that of conventional internal combustion engines. This paper presents the physicochemical properties of compressed natural gas, the two combustion modes (premixed combustion and non-homogeneous diffusion combustion) in internal combustion engines and the effect of compressed natural gas on the performance of internal combustion engines. Compared with gasoline engines, natural gas internal combustion engines have relatively lower power and higher effective power loss; lower effective fuel consumption rate in terms of economy; and lower CO and NOx emissions than gasoline engines in terms of emissions.
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压缩天然气(CNG)对内燃机燃烧和排放性能影响的研究进展
为了减少常规内燃机对环境的污染,天然气在内燃机中的应用以及天然气内燃机的燃烧和排放性能得到了学者们的广泛研究。由于天然气的物理和化学性质不同于常规汽油或柴油,因此天然气内燃机在实际应用中的运行性能也不同于常规内燃机。本文介绍了压缩天然气的物理化学性质、内燃机的两种燃烧方式(预混燃烧和非均匀扩散燃烧)以及压缩天然气对内燃机性能的影响。与汽油机相比,天然气内燃机功率相对较低,有效功率损失较高;经济性方面有效燃油消耗率较低;二氧化碳和氮氧化物的排放量也比汽油发动机低。
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