Top-Agitated Reactor Draft Tube Mixing

The patent inverts the conventional bottom-agitated design by positioning the impeller at the top of the draft tube instead of at the bottom. This top-agitation approach creates a downward flow through the draft tube that achieves effective gas dispersion while reducing power consumption and improving pumping effectiveness compared to bottom-agitated designs.

The patent introduces a draft tube as an intermediary structure between the impeller and the reactor bottom. This draft tube mediates the flow pattern, creating a controlled downward flow that enhances gas dispersion efficiency while reducing the energy required for mixing compared to direct bottom agitation.

The patent inverts the conventional top-agitated design by using a draft tube to redirect the impeller-induced flow downward through the reactor. This inversion allows top agitation to achieve gas dispersion capacity comparable to bottom agitation while maintaining lower power consumption.

The patent utilizes hydraulic principles through the draft tube design, where the impeller creates a hydraulic flow that drives sludge and gas downward through the draft tube. This hydraulic approach enhances gas dispersion efficiency without requiring additional mechanical energy input.

The patent applies local quality by creating different flow characteristics in different regions of the reactor. The draft tube creates a high-velocity downward flow in its vicinity that prevents solid bed formation, while the outer region provides gentle mixing. This localized flow differentiation achieves effective mixing without causing solid bed formation.

The patent introduces dynamic flow patterns through the draft tube, where the downward flow velocity varies with operational conditions. This dynamic flow continuously disrupts potential solid bed formation at the reactor bottom while maintaining effective mixing throughout the reactor volume.