System for reliquefying boil-off vapor from liquefied gas
A liquefied natural gas boil-off vapor reliquefying process consists of the following steps: (1) removing a first stream of liquefied gas from an insulated storage tank and expanding it to a low pressure cold vapor stream; (2) removing a second stream of liquefied gas from the storage tank and passing it in heat exchange relationship with the cold first stream to cool the second liquefied gas stream; (3) returning the cooled second liquefied gas stream to the vapor space of the storage tank to cool the tank contents; (4) feeding the now warmed low pressure first stream into inspiration communication with a venturi ejector; and (5) feeding a high pressure third stream of gas through a venturi ejector to inspirate and pressurize the low pressure vapor from the first stream and admix with it to form an exit stream. (12 claims)
- Assignee:
- Chicago Bridge and Iron Co.
- Patent Number(s):
- US 3800550
- OSTI ID:
- 6747154
- Country of Publication:
- United States
- Language:
- English
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