Is the stirring speed of the reactor really that important?
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Is the stirring speed of the reactor really that important? For example, with a cycloidal pinwheel reducer having two speed ratios of 17 and 23, and a four-pole motor, the rotational speeds are 63 and 85 respectively. What impact can such a small difference in speed have on the manufacturing process? Under what circumstances is a higher mixing speed required, under what circumstances is a lower mixing speed needed, and under what circumstances is it desirable for the mixing speed to be adjustable?
The type of mixer should be selected based on the properties of the material. The rotation speed should be determined based on the type of mixer or data obtained through relevant software, or based on data derived from pilot or scale-up tests. In some reactions, the physical properties of the material undergo significant changes as the reaction progresses, making it impossible to use the same rotation speed throughout. Additionally, frequency converters are available not necessarily to adjust the speed, but merely to prevent shocks to the components connecting the motor and gearbox during startup or shutdown, due to sudden changes in speed.
It’s really hard to say.:lol
It’s of course very important; it’s a key technical parameter for mixing. If you’re not sure, use variable frequency technology, but it’s still necessary to conduct process calculations to determine an approximate range
The rotation speed is important, and the mixing pattern is also important. Once the mixing mode is determined, the mixing speed is then set based on that mode. For example, in our glass-lined steel industry, frame-type mixing has been chosen. A rotation speed of 63 revolutions is generally chosen. A paddle stirrer is used, with a rotation speed of 139 revolutions.
Importantly, this requires a specific analysis for each product
The type of stirrer is related to the viscosity of the material and has little to do with the industry. Additionally, the rotation speed is directly related to the data obtained from experiments, and is not related to common rotation speeds.
You’re absolutely right; mixing is directly related to factors such as rotation speed, the design of the impellers, their position in the liquid, the density of the medium, its viscosity, and the depth to which the impellers are submerged. Therefore, it’s essential to keep learning
It still has a significant impact; in our company, there is a phenomenon where even a slight decrease in rotational speed can result in an increase in reaction time of several hours.