Reliquefaction of boil off gas

Patent · Tue Nov 18 04:00:00 EST 1975

OSTI ID:5878273

Jones, J K

Boiloff gas may be reliquefied by Petrocarbon Developments Ltd's new method, which requires neither space for equipment in the machinery area of the ship nor the utilization of steam from the ship's boilers, and has a greatly reduced cooling-water consumption. All of the boiloff gas may be reliquefied or some 20% can be diverted for use in the prime mover for the reliquefaction process, allowing the equipment to be substantially self-contained. The method utilizes a compression refrigerator having two refrigerant loops: In one, the compressed refrigerant is expanded in a turbine; in the other, it is expanded without the performance of external work. The expansion turbine and a gas turbine (which can be fueled by the gas) provide the power for compressing the refrigerant. The gas is reliquefied by heat exchange with cold, expanded refrigerant in the second loop. One embodiment uses open loops, with the gas providing the refrigerant.

• Assignee: Petrocarbon Development Ltd.
• Patent Number(s): US 3919852
• OSTI ID: 5878273
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
032000* -- Natural Gas-- Transport
Handling
& Storage
APPLIANCES
COMPRESSORS
ELECTRIC APPLIANCES
ENERGY SOURCES
EVAPORATION
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS APPLIANCES
GAS FUELS
GAS TURBINES
GASES
LIQUEFACTION
LIQUEFIED NATURAL GAS
MACHINERY
NATURAL GAS
PHASE TRANSFORMATIONS
REFRIGERATING MACHINERY
REFRIGERATORS
THERMOCHEMICAL PROCESSES
TURBINES
TURBOMACHINERY
VAPORS