期刊
FUEL
卷 327, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.125097
关键词
Biodiesel; Higher alcohol; Dual fuel combustion; NOx reduction; Injection timing; EGR
资金
- SSN Trust, Chennai, India [SSN/IFFP/MARCH 2019/1-12/06]
The study found that in dual fuel combustion, adjusting the start of injection and implementing exhaust gas recirculation can effectively reduce nitrogen oxide emissions. Compared to conventional combustion mode, significant reductions in NOx emissions were achieved, around 50%, for diesel and biodiesel, recommending the use of a start of injection at 25 degrees before top dead center and 10% EGR.
Dual fuel combustion (DFC) is one of the current emission reduction methods adopted widely for diesel engines. In DFC, high-octane fuels (alcohol) are port injected and high cetane fuels (diesel, biodiesel) are directly injected into the cylinder. However, DFC is reported to increase nitrogen oxides (NOx) compared to conventional combustion mode (CCM) at higher loads. Hence, to mitigate NOx emission in DFC of isobutanol (IB) with diesel, B20, and B100 fuels at higher loads (80 and 100%), the influences of start of injection (SOI) and exhaust gas recirculation (EGR) are investigated. The baseline SOI of DFC fixed at 27 degrees CA before top dead center (bTDC) is retarded to 25, 23, and 21 degrees CA bTDC, and varying EGR (10, 15, and 20%) is implemented at the baseline SOI. Significant NOx reductions of 47.11, 52.53, and 54.45% at the SOI of 21 degrees CA bTDC (at 100% load) and 41.74, 46.38, and 47.81% at 20% EGR (at 80% load) are achieved in the DFC of diesel, B20, and B100 respectively, visa-vis their CCM. In DFC of D-IB and B20-IB, retarded SOIs and 10% EGR exhibited better NOx/smoke trade-off than their CCM. Overall, all the DFCs with SOI of 25 degrees CA bTDC as well as 10% EGR is suitable operating conditions compared to CCM.
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