Sulfuric
Acid Alky
Carol:
Our alky unit
refrigeration compressor is limited by low suction pressure. The suction
pressure gets down to one psig or less, but contactor temperature is 60°F or
more. So, we slow down the compressor (turbine driver), to bring up the suction
pressure, but then the contactors get hotter still. Any suggestions would be
appreciated.
Norm:
May I suggest you
reduce your depropanizer bottoms temperature by 5°F. This will allow propane to
build in your refrigerant recyle and raise compressor suction pressure, but without
raising contactor temperature. You need to make moves on the depropanizer
bottoms temperature slowly, as it will take several hours for the refrigerant
recycle propane content to respond. Note, that if your compressor discharge
pressure is at max, this will not work.
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