BOG Management and CO2 Recovery
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.
API provides cryocoolers specifically suitable for handling LNG BOG both for land based and maritime storage tanks.
Liquid hydrogen BOG Management
When Liquid hydrogen is stored, heat losses of the tank will cause evaporation of the liquid, called Boil-Off Gas or BOG. To avoid this gas being vented with the consequently loss of energy, it will have to be re-liquefied. API provides such BOG solutions for liquid hydrogen tanks.
Carbon Capture and CO2 Recovery
API can help you reduce your carbon off-put while increasing profitability. By recovering CO2 and utilizing it where it is needed, we can help manufacturing plants attain environmental and financial objectives. Some of the uses are:
- Food grade CO2 can be produced for beverage and breweries applications which provide security of supply and reduce the overall usage of CO2
- CO2 for dry ice production use for cold storage or for cleaning applications
There are different technologies that can be used to capture and recover CO2 from different sources of a manufacturing plant depending on the exhaust gas characteristics. Among the sources are:
- Boiler exhaust streams
- Power generators exhaust streams
- Freezing and dry ice production
- Bio Gas