Liquid natural gas (LNG) shipping industry has increased dramatically since 1959. The cargo capacity has jumped from 150,000 m3 to 250,000 m3 meanwhile; the transport distance reached 7000 Nmile. Numerous LNG carriers demonstrate a good experience with using their boil off gas (BOG) as a fuel for propulsion machinery, mainly steam turbines. Lately, about 40% of the new orders shifted to slow speed diesel engines with reliquefaction plant (SSDRL) and dual fuel diesel electric propulsion (DFDE). So far, marine gas turbines are not applied yet in LNG carriers. This paper discuses the applicability of using natural gas as a fuel with marine gas turbine electric propulsion (DFGE), utilizing natural boil off gas (NBOG) and forced boil off gas (FBOG) as well as investigating its economical and environmental beneficial over other propulsion options. The benchmark ship chosen for this study has a capacity of 150, 000 m3 powered by conventional steam propulsion. For this purpose a spreadsheet model were developed to determine the LNG carrier operating cost for different propulsion options. This is in addition to a sensitivity analysis to study the effect of varying range, (HFO) and natural gas (NG) prices on ship operating cost. It was found that, using (NG) as a fuel with the proposed marine gas turbine cycle at current HFO and NG prices provides the highest cost saving for a distance less than 4000 Nmile. With the expected changes in fuel prices, the proposed cycle achieves cost saving of 3% per round trip and this saving is directly proportional with increasing of fuel prices compared to other options.
Evaluation of using natural gas as a fuel for LNG carriers "Application of marine gas turbines"
2010
7 Seiten, 8 Bilder, 2 Tabellen, 11 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Tema Archiv | 1980
|Engineering Index Backfile | 1943
|TIBKAT | 1977
|Tema Archiv | 1980
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