Determination of the purge flow rate for Staudinger compressors and optimization of the purge system
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A Stäubli compressor LMC313 is used for circulating the reaction gas in the propylene polymerization process – this gas consists of 80% propylene along with fine polypropylene particles, at a pressure of 30 bar and a temperature of 70 degrees. The sealing system employed is Flowserve GSS: Tandem Mechanical Dry Gas; the model numbers for the upper and lower seals are both SE04AD22RZ1UC1A. Due to the presence of fine particles, a separate circulation stream is used to purge the mechanical seals, and a filter is required to remove these particles from this stream; therefore, the filter needs to be replaced and cleaned frequently. The question now is: what is the required purge flow rate for this mechanical seal? How can switching and purging be minimized?
It is best to contact the manufacturer regarding this issue. I think that for a set of molding equipment designed by the manufacturer, there is very little that needs to be optimized. It is best to ensure stable and long-term operation in production, as this is the most effective way to save energy and reduce consumption; for reference only.
The key issue is that we know too well just how much control is needed, and also the filters are switched too frequently.
Purge control can be based on timing or on a resistance signal. The key is to look at the pressure difference and determine what the process requirements are, and then take corresponding measures based on those requirements. If the purging frequency is to be reduced, consider whether it is possible to start by reducing the amount of dust. For reference.