Why is it necessary to draw off a stream of liquefied petroleum gas from the cryogenic tank for LNG liquefaction?

2015-09-12View Original

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Why is it necessary to draw off a stream of liquefied petroleum gas from the cryogenic tank for LNG liquefaction?

Reply #22015-09-12

Extracting a stream of liquefied petroleum gas is done to remove heavy hydrocarbons and prevent the cold box from becoming clogged due to freezing.

Reply #32015-09-12

The temperature of liquefied natural gas is below -162°C, and some hydrocarbons in liquefied petroleum gas may freeze at this temperature, thereby affecting operational control

Reply #42015-09-14

Can it be checked whether freezing has occurred in HYSYS? Can I see the solid? I’ve now used the hydrate formation tool on the LNG coming out of the cryogenic tank, and I can indeed observe hydrate formation at -162°C and 5 Mpa

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