Cryostar Sas

Mathias Ragot

Josef Pozivil

Vincent Fuchs

Frederic Marcuccilli

Frédéric Marcuccilli

Fabien Fabre

The invention relates to a method for providing pressurized gas from a source of liquefied gas to a consumer (), wherein vaporized gas is supplied from the source of liquefied gas () through a main input line () to a compressor arrangement () for pressurizing the vaporized gas, the compressor arrangement () comprising a plurality of compressor modules (), each compressor module being able to operate independently from any other compressor module of the compressor arrangement (), one or more of the compressor modules () of the compressor arrangement () can be bypassed, and wherein gas is conducted through only a part or all of the compressor modules depending on at least one of pressure level, temperature level, mass flow and composition of the gas to be provided to the consumer ().

Method for providing pressurized gas to consumers and corresponding compressor arrangement at variable suction conditions

The system for treating a gas deriving from the evaporation of a cryogenic liquid and supplying pressurized gas to a gas engine according to the invention comprises, on the one hand, from upstream to downstream, a reliquefaction unit () with compression means (), a first heat exchanger () and expansion means (), and, on the other hand, a pressurized gas supply line comprising, from upstream to downstream, a pump () for pressurizing the liquid and high-pressure vaporization means (). The pressurized gas supply line has, upstream of the vaporization means (), a bypass () for supplying a second heat exchanger () between, on the one hand, pressurized liquid of the supply line () and, on the other hand, a line () of the reliquefaction unit () downstream of the first exchanger and upstream of the expansion means ().

System for treating a gas deriving from the evaporation of a cryogenic liquid and supplying pressurized gas to a gas engine

A system () for liquefying a gas comprises a liquid piston gas multistage compressor (). It can be arranged on-board a liquefied gas carrier for recycling boil-off gas. Such system may be easily adapted or controlled for matching wide requirement ranges for variations of the liquefaction capacity. In addition, at least part of the liquid piston gas multistage compressor can be shared between the gas liquefying system and an extra gas-fed device. Such extra gas-fed device may be in particular a gas-fuelled or hybrid fuel propulsion engine of the vessel.

System for liquefying a gas

Natural gas boiling off from LNG storage tanks located on board a sea-going vessel, is compressed in a plural stage compressor. At least part of the flow of compressed natural gas is sent to a liquefier operating on a Brayton cycle in order to be reliquefied. The temperature of the compressed natural gas from the final stage is reduced to below 0&#xb0; C. by passage through a heat exchanger. The first compression stage is operated as a cold compressor and the resulting cold compressed natural gas is employed in the heat exchanger to effect the necessary cooling of the flow from the compression stage. Downstream of its passage through the heat exchanger the cold compressed natural gas flows through the remaining stages of the compressor. If desired, a part of the compressed natural gas may be supplied to the engines of the sea-going vessel as a fuel.

Growing community of inventors

Sierentz, France

Mathias Ragot