1.Improved Gas Flow Conditions in an Anaerobic Trickle Bed Reactor in a Co-Current Configuration.

   Description:

                             As part of the Power-to-Gas project, biological CO2-methanation is a potential technology for storing energy from renewable sources. The selection of an appropriate reactor is one of the most challenging aspects of this technology. Before selecting a reactor for biological CO2- methanation, attention should be given to its CH4 productivity and gas-liquid mass transfer capacity. To facilitate effective biological CO2-methanation, the trickle bed reactors have recently been investigated. Improved gas flow conditions in trickle bed reactors can lower operating expenses while simultaneously increasing operational efficiency. The current study has investigated the influence of gas flow directions and sprinkling on gas flow conditions. The study found a significant variation between the co-current and the counter-current flow. The flow conditions were better for the co-current flow than the counter-current flow. The pattern of co-current gas flow was comparable to plug flow. The results also demonstrated that continuous sprinkling had a negligible impact on gas flow conditions. Furthermore, the simulation software COMSOL Multiphysics 5.4 was used to evaluate the explanations of the counter-current flow pattern, which differed from the co-current flow pattern.

2. Gas Flow Condition in the Trickling Bed Reactor.

Descriptions:

                   Biological CO2 methanation is critical in the power-to-gas (PtG) conversion phase. Different reactor types have been developed for methanation. The trickling bed reactor (TBR) has a high efficiency as compared to other methanation reactors. To provide optimum efficiency and stable operation in TBR, it is important to understand flow conditions as they influence the biological processes and methane productivity. This study examined the influence of hydrogen gas (H2) flow direction on the dynamic behavior of a semi-industrial trickle bed reactor.The gas flow appears to be linked to the gas mass, bio-carrier orientation, and reactor configuration. Depending on the flow direction, the same reactor demonstrated the properties of two distinct types of reactors.