Fremgangsmåte og innretning for flytendegjöring av naturgass

• Main Authors: PAUROLA, PENTTI, BOELT, MANFRED, STOCKMANN, RUDOLF, SAPPER, RAINER
• Format: Patent
• Language: Norwegian
• Published: 24.10.2002
• Edition: 7
• Subjects: AIR INTAKES FOR JET-PROPULSION PLANTS; BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; COMBUSTION ENGINES; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS; GAS-TURBINE PLANTS; HEAT PUMP SYSTEMS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; MIXTURES BY PRESSURE AND COLD TREATMENT; REFRIGERATION OR COOLING; WEAPONS

The compressor is driven by energy liberated from combustion of a portion of the liquefied natural gas. An Independent claim is included for the corresponding plant. Preferred features: Evaporation of a proportion of the liquefied gas, is used to feed gas turbine combustion. The turbine has a generator to drive an electric motor which turns a compressor. A portion of the liquefied natural gas is preheated by heat exchange using an existing circulating flow of the natural gas liquefaction process. Preheating is derived from a side stream of a head product from the column separating heavy hydrocarbons from natural gas, or from a side stream associated with a subcooling circuit, or a side stream of the raw gas to be liquefied. Further heating methods include use of steam, hot oil or electricity. From a storage tank for liquefied natural gas, some liquid is pumped out, preheated and at about 30-50 bar, it is evaporated to form a fuel gas. This is then burned in the gas turbine.