Design and CFD Numerical model of biogas digestion plant of Biomass Blending

OIL AND GAS ENGINEERING

The three main goals for future energy systems are reduced greenhouse gas emissions, more renewable energy, and enhanced energy efficiency. Biogas production via biodegradation and anaerobic digestion is a popular bioenergy method for producing biofuels and managing industrial and home organic waste. Proper mixing of the organic mass is required in biogas production to generate high biogas outputs by bacteria and enzymes. According to assessments of biogas plant electric power consumption, the electrical energy need of the stirrer system accounts for a considerable portion of the whole electricity consumption of a biogas plant. As a result, laboratory prototypes and computational simulations may be beneficial for analyzing and improving the efficiency of mixing systems. This research demonstrates how a computational fluid dynamics (CFD) model can be used to commercial stirring devices. Two propeller stirrers in diametrically opposed orientations are detailed in a tank filled with approximately 1400 m3 of substrate. The fluid rheology is altered to a biomass with a dry matter concentration of 12 wt% and a non-Newtonian generalized Ostwald-de Waele power law for the simulation. The suggested modeling approach takes into account the rotation angle and height of each propeller. The technological benefit of 441 mixing setups is computed and evaluated. The findings reveal that rotor positions far from the bottom, as well as significant rotational angles, provide beneficial fluid dynamics.

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