What pressure control on the liquefied feed gas side of the LNG cryogenic tank is considered appropriate?
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1. The feed gas is compressed to 48 kg/cm2, while the LNG outlet pressure in the cryogenic tank is 45 kg/cm2; some plants use 40 kg/cm2, which seems to help save energy. What are everyone’s thoughts on this? Too low a temperature makes liquefaction difficult, increasing the load on the refrigerant compressor.
4.5, right. Efficiency decreases below 4.5
It is best to control it at the critical pressure to save energy
The LNG liquefaction pressure should preferably be maintained at the critical pressure level. The temperature should ideally be maintained at the critical temperature