Which to choose: falling film evaporation or forced circulation evaporation?
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I currently have two sets of falling film evaporators, with a flow rate of 15 cubic meters, heating surfaces of 20 square meters, and the boiling point of the material to be heated is 80 degrees Celsius. I would like to change from falling film evaporation to forced circulation evaporation, and increase the circulation volume to 50 cubic meters. Will this make the evaporation process faster? ? ?
In addition to choosing high efficiency, factors such as the installation structure, cost, transportation, and processing must also be taken into consideration.
The efficiency of falling film is still not very clear!
So, considering my situation, what advice do you have?
It’s just a reminder; these aspects need to be taken into consideration, though the specific details are unclear. Sorry!
What is the material system of the process you mentioned? The initial choice of falling film evaporation is likely related to the properties of the material; is it appropriate to switch to forced circulation evaporation?
It’s that the original prototype had some issues; the material used was ethanol and ethyl acetate
Firstly, heat transfer is determined by the temperature difference and the heat exchange area. There are two ways to heat the material quickly: one is to increase the temperature on the primary side, as a greater temperature difference results in faster heat transfer. The second is to increase the area, which essentially means increasing the heat exchange time. By changing gravity-driven descent to forced circulation, you increase the flow rate; however, the change in phase reduces the heat exchange time, which is not a worthwhile trade-off. Every piece of equipment is designed with economic efficiency in mind. I suggest you consider the energy-saving aspect before making changes blindly. Otherwise, the desired effects will be achieved, but the energy efficiency will decrease, resulting in a significant reduction in economic benefits.