Investigation of engine power and emission variables in compression ignition engines using a combination of compressed natural gas and diesel fuel
2024
Niknam, Yaser | محمد زمانی, داود | Gholami Pareshkoohi, Hassan
The present study was conducted to investigate the possibility of using compressed natural gas fuel in compression ignition engines without the use of ignition system. For this purpose, a four-cylinder compression-ignition engine with the possibility of using compressed natural gas as the main fuel and diesel fuel as the igniter was used. Performance tests and emission of pollutants were performed at the Engine Research Center of Tabriz Motor Manufacturers Company. All performance and pollution tests were performed after 10 minutes of operation in the engine room and the tests were performed in five levels of rotational speed of 1200, 1400, 1600, 1800 and 2000 rpm and in two modes of single diesel fuel and dual fuel mode (combined fuel) was performed in three replications. The maximum output torque of the engine in single diesel mode was 360 N.m at a rotational speed of 1400 rpm and the maximum output torque of this engine in the combined fuel mode was 334 N.m at a rotational speed of 1600 rpm, which showed that the combined fuel mode had 26 N.m of torque reduction. In addition, with increasing the rotational speed of the engine, the amount of diesel fuel consumption also increased. According to the results of pollution tests, at indicated rotational speed of 2000 rpm, the amount of NOX, HC, CO2 and CO pollutants in the combined system was 20, 53, 16 and 86% more than diesel fuel, respectively, and the variables O2 and soot at indicated rotational speed of 2000 rpm, the combined system was 51% and 69% lower than diesel fuel, respectively. Therefore, by using a hybrid system, there is no significant reduction in engine production capacity and this system can be proposed as an alternative to existing systems, although compared to diesel fuel, hybrid fuel produced more pollutants.
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