Model-based control for a demand-driven biogas production to cover residual load rises

Bioprocess and Biosystems Engineering
Lena PetersSven Steinigeweg

Abstract

The development of systems for energy storage and demand-driven energy production will be essential to enable the switch from fossil to renewable energy sources in future. To cover the residual load rises, a rigorous dynamic process model based on the Anaerobic Digestion Model No. 1 (ADM1) was applied to analyse the flexible operation of biogas plants. For this, the model was optimised and an operational concept for a demand-driven energy production was worked out. Different substrates were analysed, both by batch fermentation and Weende analysis with van Soest method, to determine the input data of the model. The lab results show that the substrates have got different degradation kinetics and biogas potentials. Finally, the ADM1 was extended with a feeding algorithm which is based on a PI controller. Essential feeding times and quantities of available substrates were calculated so that a biogas plant can cover a defined energy demand. The results prove that a flexible operation of biogas plants with a feeding strategy is possible.

References

Oct 14, 2006·Water Science and Technology : a Journal of the International Association on Water Pollution Research·B WettM Ogurek
Nov 7, 2008·Biotechnology and Bioengineering·D J BatstoneD Starrenburg
Jun 29, 2010·Bioresource Technology·Konrad KochHarald Horn

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