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<p>The rising energy consumption, energy crises, industrial growth, and environmental pollution have prompted a shift towards renewable energy resources. This study investigates the dynamic behavior of high-viscosity fluids in stirred tanks, both baffled and non-baffled, relevant for laboratory applications and biogas production. A cylindrical tank with four vertical baffles was analyzed, focusing on the flow field, turbulent kinetic energy, and its dissipation rates at rotational speeds of 20, 40, and 60&#xa0;rpm. Comparisons between experimental and simulated results highlighted an acceptable 6% error in power consumption and Reynolds number predictions. At different rotational speeds, the radial velocities measured along the blades were 0.237, 0.130, and 0.041&#xa0;m/s for the baffled tank, and 0.226, 0.128, and 0.041&#xa0;m/s for the non-baffled tank, respectively. Furthermore, an increase in vertical flow contributed to greater turbulence intensity. The turbulent kinetic energy for baffled and non-baffled vessels at these speeds was recorded as 0.0215, 0.0102, 0.0024&#xa0;m²/s² and 0.0188, 0.0091, 0.0022&#xa0;m²/s², respectively. Dissipation rates were 0.049, 0.011, 0.0006&#xa0;m²/s³ and 0.037, 0.0091, 0.0005&#xa0;m²/s³. The findings confirm that baffled configurations enhance radial flow and mixing efficiency. The final cumulative biogas production results after 19 days of operation showed significant differences in the performance of each stirring speed. The amounts of biogas collected were 367, 488, 418, and 325&#xa0;L at stirring speeds of 0, 20, 40, and 60&#xa0;rpm, respectively. The optimal stirring speed was 20&#xa0;rpm, yielding a positive energy balance of 4.424&#xa0;MJ, the highest net energy efficiency. These findings suggest that moderate stirring with baffles optimizes both methane output and energy performance.</p>

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Influence of Internal Reactor Configurations on Hydrodynamics and Methane Yield in High-Solids Anaerobic Digestion

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Amin Pirmoghani,
  • Shoaib Gholami,
  • Meghdaad Pirsaheb,
  • Masoud Moradi,
  • Behzad Shahmoradi,
  • Mahdi Safari,
  • Hee-Jeong Choi

摘要

The rising energy consumption, energy crises, industrial growth, and environmental pollution have prompted a shift towards renewable energy resources. This study investigates the dynamic behavior of high-viscosity fluids in stirred tanks, both baffled and non-baffled, relevant for laboratory applications and biogas production. A cylindrical tank with four vertical baffles was analyzed, focusing on the flow field, turbulent kinetic energy, and its dissipation rates at rotational speeds of 20, 40, and 60 rpm. Comparisons between experimental and simulated results highlighted an acceptable 6% error in power consumption and Reynolds number predictions. At different rotational speeds, the radial velocities measured along the blades were 0.237, 0.130, and 0.041 m/s for the baffled tank, and 0.226, 0.128, and 0.041 m/s for the non-baffled tank, respectively. Furthermore, an increase in vertical flow contributed to greater turbulence intensity. The turbulent kinetic energy for baffled and non-baffled vessels at these speeds was recorded as 0.0215, 0.0102, 0.0024 m²/s² and 0.0188, 0.0091, 0.0022 m²/s², respectively. Dissipation rates were 0.049, 0.011, 0.0006 m²/s³ and 0.037, 0.0091, 0.0005 m²/s³. The findings confirm that baffled configurations enhance radial flow and mixing efficiency. The final cumulative biogas production results after 19 days of operation showed significant differences in the performance of each stirring speed. The amounts of biogas collected were 367, 488, 418, and 325 L at stirring speeds of 0, 20, 40, and 60 rpm, respectively. The optimal stirring speed was 20 rpm, yielding a positive energy balance of 4.424 MJ, the highest net energy efficiency. These findings suggest that moderate stirring with baffles optimizes both methane output and energy performance.