Homogeneous charge compression ignition engine operating on synthesis gas

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• 作者：Anil Singh Bika ; ^{bika0007@umn.edu} ; Luke Franklin ; David B. Kittelson
• 关键词：Synthesis gas ; HCCI engines ; Hydrogen engines
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：June, 2012
• 卷：37
• 期：11
• 页码：9402-9411
• 文件大小：1020 K

摘要

Mixtures of hydrogen and carbon monoxide were used to simulate the fuel component of synthesis gas and operate a single cylinder engine in homogeneous charge compression ignition (HCCI) mode. The engine was originally an air-cooled direct injection (DI) compression ignition (CI) engine. The original diesel fuel injection system was removed and a port fuel injection (PFI) system with intake air heating was added. The engine speed was maintained at a constant 1800聽RPM.

Three synthesis gas fuel compositions were tested, which comprised of 100%H₂, 75/25 H₂/CO ratio, and 50/50 H₂/ CO ratio, by volume. These compositions were investigated at an equivalence ratio (EQR) of 0.26 and 0.30. In-cylinder pressure and H₂/CO emissions measurements were made at all conditions.

To achieve peak indicated mean effective pressure (IMEP) at a given equivalence ratio, the intake air temperature had to be increased with increasing CO fraction in the synthesis gas mixture. For the EQR聽=聽0.26 conditions, the intake air temperature required for best IMEP was 78聽掳C, 84聽掳C, and 98聽掳C, for 100%H₂, 75/25 H₂/CO ratio, and 50/50 H₂/CO ratio, respectively. For the EQR聽=聽0.30 conditions, the intake air temperature requirements were 62聽掳C, 71聽掳C, and 81聽掳C, for the same respective H₂/CO proportions. The peak in-cylinder temperatures for all conditions tested ranged from roughly 1200聽K-1500聽K depending on intake air temperature, mixture concentration, and fuel composition. The combustion event was short, with the rapid burn angle ranging from 9.5 CAD to 11.5 CAD for all conditions tested, and the synthesis gas mixture composition did not change this significantly. The combustion efficiency was between 83%and 88%for the peak IMEP conditions tested.