Regarding MVR heaters
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I would like to ask: when calculating the heater for the MVR forced-circulation evaporation process, should the original liquid flow rate used be the feed flow rate or the circulation flow rate? What is the relationship between the circulation flow rate and the feed flow rate?
The circulating flow rate can be estimated by reversing calculation based on a gasification rate of around 8%
Since forced circulation is used, clogging should be more likely to occur. The circulation volume is related to the heater you use; in the case of tubular heat exchangers, a certain flow velocity must be maintained within the tubes. Based on this flow velocity, the flow rate can be determined, and this flow rate is generally much higher than the amount of material fed in – it’s roughly equal to the circulation volume. Different types of heaters have different circulation rates as well
Taking forced circulation as an example, the flow rate for system balance calculations is the selected circulation flow rate; the choice of circulation pump depends on whether a plate-type or tube-type design is used. For tube-type systems, a flow velocity of 1.8 to 22 m/s is generally used for calculations, and the circulation flow rate can be determined by reversing this value