La optimización geométrica de reactores de biogás es clave para garantizar una mezcla eficiente y un proceso estable.

Mediante simulación CFD, analizamos distintas configuraciones evaluando la velocidad, el tiempo de residencia, la distribución térmica y la concentración de sólidos.

Esto nos permitió identificar la geometría óptima, así como también reducir zonas muertas y maximizar el rendimiento del proceso biológico.

PROJECTS

Geometric Optimization of a Biogas Reactor

The client needed to determine the optimal geometry for a biogas reactor capable of achieving maximum mixing efficiency.

The primary design criteria were:

Preventing digestate velocity from falling below recommended minimum values

Minimizing digestate residence time within the tank

Reducing non-uniform distribution of organic matter

Preventing dead zones and sedimentation phenomena

The objective was to ensure a stable and efficient biological process while maximizing the effective reactor volume.

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PROJECT SCOPE

A detailed CFD model was developed considering:

All reactor inlets and outlets
Digestate composition, including dispersed organic matter
Operating conditions such as inlet flow rates and temperatures

The reactor included three independent mixing circuits, each with its own injector that mixed digestate with generated biogas to enhance biological reactions.

The model therefore incorporated:

Different mixing system operating sequences
Operating times of each circuit
Interaction between flows
Thermal effects associated with mixing and biological activity

RESULTS & CONCLUSIONS

Several performance indicators were used to compare the proposed reactor geometries.

Digestate Velocity

The total volume where velocity exceeded the minimum recommended threshold was quantified, identifying potential stagnation zones.

Residence Time and Mixing Efficiency

The time required to achieve homogeneous mixing was calculated, determining which configuration provided the shortest effective mixing time.

Temperature Distribution

Thermal gradients were analyzed to assess heat transfer efficiency between different flow regions, a key factor for biological process stability.

Organic Matter Distribution and Sedimentation Risk
Areas with high solids accumulation and potential deposition were identified.

The analysis revealed the geometry that provided:

Greater active volume with adequate flow velocities
Shorter mixing times
Improved thermal homogeneity
Lower risk of solids accumulation and sedimentation

Thanks to CFD simulation, the reactor design was optimized before construction or modification, reducing operational risks and improving overall biogas production performance.