Liquid Natural Gas (LNG)
LNG Production
We provide an integrated gas purification & liquefaction plant that can be made suitable for natural gas liquefaction of all types of natural gas.
Biogas is defined as gas that is generated by anaerobic digestion of organic material and can have several origins: agricultural waste, municipal waste (including waste water treatment) or landfills.
We provide an integrated system with the conditioning of the Biomethane and with the cooling cycles necessary for liquefaction. Liquefaction technology makes it possible to produce Bio-LNG at low pressures, even in the presence of lighter gases (eg N2, O2, H2), up to a temperature of 77K.
LNG BOG Management
When storing, bunkering and/or transferring LNG, boil-off gas (BOG) is formed which increases the temperature/pressure in the storage tank. This pressure build up needs to be managed to prevent venting of the boil off gas or, worse case scenario, tank failure.
Managing (re-liquefying) the BOG and decreasing the pressure build up within the tank is the best way to prevent this.
Direct BOG re-liquefaction
Boil-off gas is taken from a storage tank, re-liquefied and transferred back into the storage tank. This can be done by gravity or by using a separate transfer vessel. BOG re-liquefaction is used on maritime applications when LNG is transported from one country to another
Liquid Subcooling and Spraying
LNG is pumped from the bottom of an LNG storage tank to the StirLNG, subcooled to a temperature below the liquefaction temperature and sprayed back in the top of the storage tank thus re-liquefying the BOG.
NCM provides cryocoolers specifically suitable for handling LNG BOG both for land based and maritime storage tanks.