Experimental Study on the Effect of Hydrogen Addition on Emissions of a Heavy-Duty Diesel Engine
1 year ago
Authors:
Trương Văn Mến,Huỳnh Thanh Bảnh
Publication date:
20 / 04 / 2022
Name of Publishers:
Springer - Lecture Notes in Mechaninal Engineering
Abstract:
In this work, the effect of H2 addition on the emissions of a heavy-duty diesel engine is experimentally investigated. The purified H2 gas is added to the intake manifold and premixed with the air stream before being inducted into the combustion chamber. The results show that the H2 addition results in a slight reduction of the CO emission excluding the 100% engine load. In addition, the decreases in CO2 emission and opacity are also observed with H2 addition and that can be due to the better combustion and the absence of carbon atoms in H2 fuel. The largest reduction of CO2 and opacity are obtained by 53.2% (489.6 compared to 1046.2 g/kWh) and 57% (6.47% compared to 15.01%) with 7% and 6% H2 vol. addition compared to neat diesel fuel operation at 25% and 75% engine loads, respectively. The positive effect of H2 addition on the particular matter (PM) is also observed at 50% and 75% engine loads. The highest decrease of PM emissions is 72% (193.3 compared to 357.8 mg/kW.hr) with 7% H2 addition at 75% engine load. Moreover, the HC emissions also tend to decrease as operated with H2-diesel dual fuel. In contrast, there is an increase in NOx emissions and exhaust gas temperature. The findings further confirmed that the H2 addition to CI engines can provide benefits to the reduction of exhaust emissions except for NOx emissions.