Regarding the setting of the compressor pressure ratio in the Aspen process
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I recently used ASPEN PLUS to carry out a simulation of a distillation process. Since it involves low-temperature distillation of ethylene and ethane, and according to the process parameters (feed at 78 degrees and 3 bar to -16 degrees and 22 bar), two stages of compression were applied before the feed. I’m not very familiar with the actual process flow for ethylene production; I noticed that in some designs the compression ratios of the two compressors are set at 3 and 2.44. I wonder what determines these ratios, whether such settings are reasonable, if there is an empirical range for the actual process compression ratios, and why an outlet pressure isn’t simply specified. I sincerely seek advice from all the experts here. Thank you
Reply to 1# guojingdehao: The setting of the compression ratio is determined by the effect of the outlet temperature on the composition of the flow stream; it is not allowed for an excessive compression ratio to cause coking in the flow stream composition! !