What considerations should be taken when selecting a mixer for coil cooling in a reaction vessel?
Thread Content
What considerations should be taken when selecting a mixer for coil cooling in a reaction vessel? Which mixers are restricted?
It is recommended to have the mixing equipment manufacturer conduct CFD simulations to ensure that there are no dead zones between the inner coil and the inner wall of the reactor
If it’s a jacket, isn’t the possibility of a dead zone lower than that of a coil?
Generally, yes; after all, the jacket only transfers heat to the shell and has no effect on the internal flow field. However, with a jacket, the heat exchange efficiency is definitely not as good as that of an internal coil, so you need to choose based on your actual requirements. Additionally, the inner coil does not necessarily have dead zones; a device I worked with before used an inner coil for heating, and the simulated flow field was satisfactory, with no obvious dead zones.
CFD simulation is one method. When doing process design, normally it starts with process design, including your material property data? What type of mixer should be chosen? How many layers of stirrers? The spacing between mixers? Stirring speed? Flow rate? What is the size of your droplets after stirring? Can it meet your response requirements? There’s also the reactor design, including the coil diameter? A few laps? Coil spacing? Is there a guide cylinder? The process dimensions of the guide cylinder? Liquid level height at the upper part of the guide cylinder? If so, what are the internal and external flow velocities of the guide cylinder? With all this determined, it might be better to simulate and fine-tune further based on the process condition diagram! !
Additionally, it is necessary to evaluate the heat exchange performance of the coil to determine whether it can meet the heat exchange requirements The diameter of the coil? Circulating tube? Heat exchange area? Flow rate of the cooling medium? Quantity? Can it meet your design requirements for thermal conductivity? How should the coiled tube be arranged to be reasonable? These are the factors that need to be considered in the design of reaction vessels: lol