Effect of hydrogen‐enriched biogas induction on combustion, performance, and emission characteristics of dual‐fuel compression ignition engine

Abstract

Gaseous fuel induction in a compression ignition (CI) engine has picked up much attention over the most recent few years, particularly when it is produced by using renewable sources. In this study, hydrogen-enriched biogas (HEB) was used as a gaseous fuel and co-combusted in dual-fuel CI engine.Experimentation was carried out on a 3.5-kW CI engine test rig in the brake mean effective pressure range between 0 and 3.5 bar, as well as, HEB between 0.1 and 0.5 kg/hr. HEB induction effects on various engine characteristics (combustion, performance, and emission) were studied at rated engine speed (1,500 rpm). Results revealed that the peak cylinder pressure and ignition delay period increased with increasing HEB proportion (0.1 to 0.5 kg/hr) as compared with diesel mode. The calorific value of HEB (57.0 MJ/kg) is higher than diesel (42.0 MJ/kg), which led to improved BTE in dual-fuel mode. The emission results showed that with an increase of HEB rates, the NOx emission mildly decreases, but smoke opacity and hydrocarbon emissions majorly reduce. Thus, the HEB induction has great potential to be a feasible technological solution to overcome low BTE and high hydrocarbon emissions in biogas operated CI engines.

Review of Compression Ignition Engine Powered by Biogas and Hydrogen

“…As evidence that the industrial process is based on renewable energy, hydrogen (H 2 ) is considered to have the lowest carbon footprint and the highest efficiency production energy. The combustion of H 2 produced water vapour, and did not emit PM, CO or HC, because the carbon content was zero within the structure of the H 2 composition [44]. The auto ignition for H 2 did not occur easily in modern internal combustion engines throughout compression stroke, because H 2 required higher temperature to initiate the preignition and lower cetane number in comparison of diesel fuel.…”

“…Addition of various proportions of H 2 to the blends of biogas increased the PCP due to highly combustion ability. Rosha et al [44] showed that addition of H to natural gas (NG) blends at higher loading operations increased the PCP.…”

“…Besides, as absorbed in Figure 13, the ID reduction in the diesel engine operating at high load, due to the high gas temperature and improved air-fuel mixture homogeneity of the pilot diesel fuel and blend of gaseous [60]. Moreover, increasing the share of H 2 energy under H 2 -Diesel DF mode led to ID prolongation, because faster diffusion of hydrogen displaced fresh air at the inlet manifold port, causing the combustion reaction to suffer a deficiency of required O 2 [44]. Heat release rate (HRR) may be divided to three stages.…”

Combustion Characteristics and Emission Analysis of Tetrahydrofuran–Biodiesel-Blended Fuel in a Diesel Engine

“…Against the background of the global energy crisis and environmental pollution, all countries are vigorously developing new energy vehicles and formulating more stringent emission regulations. Except for speeding up the electrification process of vehicles, seeking renewable and cleaner alternative fuels for traditional internal combustion engines or adding various additives to traditional fuels to improve their combustion and emission characteristics is also an important way to solve current energy and environmental problems. , …”