Solar-biogas hybrid renewable energy system (HRES) is an effective way for
electrification of rural area in the developing countries. When the power of the
PV panels of the HRES is higher than that of the load, the excess energy is used to
produce hydrogen through the water electrolyser. Hydrogen is then blended with
biogas to fuel the internal combustion engine of the generator. A microcontroller
connects the PV panels, the water electrolyser, and the consumed network to
automatically start the generator when an additional power is needed. The
addition of 20% hydrogen into biogas M7C3 leads to an increase in engine cycle
work by 13%, 4% and 2% at 100%, 65% and 50% load operating mode,
respectively. As compared to full load mode, CO and HC emissions of the engine
are doubled, but the NOx emission drops down 50% in the half load operating
mode. Independently loading regime, the addition of hydrogen to biogas results in
a decrease in CO and HC emissions, but an increase in NOx emissions. At a given
speed and engine loading mode, the optimal equivalence ratio and advance
ignition angle decrease as increasing CH4 composition in biogas or/and H2
content in fuel blend.
Keywords
Biogas, Hybrid renewable energy system, Hydrogen storage system, Renewable energy, Solar energy