How is the stirring power of a high-pressure reactor determined under high pressure?

Determining the stirring power under high pressure requires comprehensive consideration of the effects of pressure on medium properties, gas-liquid mass transfer, and stirring resistance. High pressure alters the density, viscosity, and gas solubility of the medium, thus affecting power consumption. Calculations must employ a modified power number correlation formula and incorporate a pressure compensation coefficient. For gas-liquid systems, increased gas density under high pressure may lead to increased gas holdup, resulting in decreased stirring power; conversely, high-viscosity systems may exhibit non-Newtonian fluid characteristics under high pressure, necessitating calculations based on actual rheological models. The type of stirrer directly impacts power requirements; turbine stirrers require increased power under high pressure to overcome gas dispersion resistance, while anchor stirrers experience a significant increase in power consumption in high-viscosity, high-pressure systems.

Power calculations must be based on actual operating parameters, including operating pressure, medium property data, stirring speed, and impeller size. In engineering, the correlation curve between the dimensionless power number (Po) and Reynolds number (Re) is commonly used, but under high pressure, the curve needs to be corrected using experimental data. For reactors with cooling coils or baffles, power losses caused by internal components must also be considered. Dynamic loads, such as the suspension of solid particles or changes in physical properties during reaction processes, require motors to have a power margin of 20%-30%. The application of variable frequency speed control systems can achieve real-time power optimization and avoid the risk of overload during high-voltage startup.