On forced circulation and natural circulation
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Previous posts have discussed the issues related to forced circulation and natural circulation, but no specific results were provided. I would like to know what the exact differences between the two are; please share your thoughts. Additionally, I’m interested in knowing which category each manufacturer falls into, such as Chlorine Engineering, Wood, Beihua Machinery, and Asahi Kasei
Forced circulation occurs in evaporators where the circulation of the medium is achieved through the thrust of an axial flow pump during the evaporation process, whereas natural circulation relies on temperature differences and density differences to facilitate the circulation of the medium, as in Levyev evaporators
Thank you for the answer. But what I would like to ask is about the circulation in the electrolyzer, specifically the circulation of saltwater and alkaline solution
Forced circulation is a form of circulation achieved through external force; it is generally used when the density of the medium material does not change much after heating, or when the medium’s own momentum is not sufficient to enable circulation. Natural circulation relies on the density difference caused by temperature differences within the medium itself to facilitate its circulation, with the density generally being the parameter most affected. Furthermore, as an increase in temperature can easily lead to unwanted issues, forced circulation is required during gluing.
Simply put: forced circulation involves a pump, while natural circulation does not
The poster is probably referring to the caustic soda process using diaphragm pumps. Natural circulation relies on density differences to facilitate flow, while forced circulation uses pumps as a driving force to achieve circulation. For specific processes, please refer to the technical attachments provided by each company
I only understand electrolysis theory but have no experience with saltwater electrolysis. However, I think the previous responses can serve as a reference for you; that is, if natural circulation can be achieved in the process, then natural circulation should be used, while if it isn’t possible, forced circulation must be considered. There are many conditions involved in this, so a comprehensive analysis is necessary
Forced circulation utilizes the driving force of a forced circulation pump to achieve circulation, with the pump’s flow rate being selected based on the required volume； Natural circulation relies on temperature differences and height differences to drive the flow, but its efficiency is not as good as that of forced circulation.