Thermal Discharge Recovery For Offshore Lng Port Pelican Terminal

摘要

The proposed Port Pelican deepwater port will be an offshorernGulf of Mexico (GOM) facility located in about 80 feet ofrnwater approximately 40 miles off the Louisiana coast tornreceive and then gasify liquefied natural gas (LNG) forrndelivery via pipeline to onshore facilities. Seawater will bernwithdrawn from about a 60-foot depth, passed through heatrnexchangers to warm the LNG to a gas, and then discharged atrna reduced temperature to the GOM. The US EPA’s 3-rndimensional jet merging model “Visual Plumes” was used asrnthe basic modeling tool to examine the mixing between therncooled “once-through” discharged seawater and ambientrnreceiving waters. Supplemental methodologies were used tornaddress model limitations arising from sea bottom boundaryrneffects. The modeling examined summer and winterrntemperature stratification conditions for two current conditionsrnand different discharge manifold designs, and defined arn“region of influence” for a specified temperature differentialrnbetween discharged and ambient waters.