Apparatus and method for recovering liquefied natural gas vapor boiloff by reliquefying during startup or turndown
This patent describes a method for recovering vapor boiloff from the vapor space of a liquefied natural gas storage container containing liquefied natural gas and a nitrogen contaminant by feeding a portion of the vapor boiloff to a reliquefier and returning the effluent from the reliquefier to the storage container. The improvement comprising avoiding upsets in the operation of the reliquefier during startup and turndown conditions by: (a) removing at least a portion of the effluent from the reliquefier to form a recycle product so as to control the concentration of the nitrogen contaminant and/or to limit the temperature rise in the vapor space of the storage container; (b) warming the recycle product in a revaporizer where any condensed portion of the recycle product is vaporized; and (c) returning the recycle product to the inlet of the reliquefier.
- Assignee:
- Air Products and Chemicals, Inc., Allentown, PA
- Patent Number(s):
- US 4675037
- OSTI ID:
- 6180185
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
035000* -- Natural Gas-- Storage-- (1989-)
CONTAINERS
CONTROL
ELEMENTS
ENERGY SOURCES
EVAPORATION
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HEATING
LIQUEFIED GASES
LIQUEFIED NATURAL GAS
NATURAL GAS
NITROGEN
NONMETALS
PHASE TRANSFORMATIONS
QUANTITY RATIO
RECOVERY
START-UP
STORAGE
STORAGE FACILITIES
TEMPERATURE CONTROL
VAPOR CONDENSATION
VAPORS