Circulated methane returns to the pyrolysis gas compressor
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The recycle methane returning to the cracker gas compressor in this unit has two pipelines. The first one returns to the first-stage suction line of the compressor; its pressure is 0.08 MPA, and the methane flow rate is 4,000 NM3/H (currently in use). Article 2: Returns to the second-stage suction line of the compressor, with a pressure of 0.4 MPa (not in use). I would like to know the differences and functions between methane entering the first stage and the second stage
An entrance and exit section. Second stage output goes back to second stage input, right?
No, it is methane coming out of the demethanization tower, after the cold energy has been recovered using a cold box.
A circular route, huh. For the 0.4 MPa return line, it is necessary to consider the outlet pressure and flow rate to prevent surging and achieve energy savings