The apparatus for vaporizing LNG comprises a heat exchanger of the intermediate fluid type and a multitubular heat exchanger, both heat exchangers using estuarine water or warm effluent water as a heat source. The process for vaporizing LNG comprises the heat exchange steps between LNG and a heating medium and between the heating medium and estuarine water or warm effluent water in an intermediate fluid type heat exchanger, and the heat exchange step between the vaporized natural gas and estuarine water or warm effluent water in a multitubular heat exchanger.
A method of chilling, cooling or likewise refrigerating a product with the aid of the cold content of a condensed gas, wherein the product, preferably in a gas or liquid state, is caused to pass at least one product-cooling heat-exchanger. According to the invention, the condensed gas is vaporized in at least one evaporation heat-exchanger and the vaporized gas is delivered to the product-cooling heat-exchanger for cooling the product therein. The gas heated by the product in the product-cooling heat-exchanger is then returned to the evaporation heat-exchanger for vaporization of the condensed gas therein. The invention also relates to an arrangement for use in carrying out the method.
An intermediate fluid type vaporizer is provided which employs a heat source fluid capable of providing a relatively large temperature difference utilizable for vaporization, and which can make an overall size of the vaporizer more compact. The intermediate fluid type vaporizer comprises an intermediate fluid evaporator constructed by providing heat source tubes in a shell, which contains an intermediate fluid therein, to evaporate the intermediate fluid of liquid phase with heat exchange between the heat source fluid and the liquid intermediate fluid, and a liquefied gas evaporator constructed by providing heat transfer tubes in the shell to evaporate liquefied gas with heat exchange between the liquefied gas and the evaporated intermediate fluid. The heat source tubes are formed by straight tubes arranged so as to constitute two or more passes.
A heat exchanger unit having a housing into which a cryogenic liquid is introduced and permitted to evaporate and vaporize into a cryogenic cold gas. A process fluid to be cooled flows in a heat exchanger and heat exchange to cool the process fluid takes place between the cold gas and the heat exchanger, without making direct contact between the cryogenic liquid and the heat exchanger which would cause freezing. The refrigerating capacity of the cryogenic cold gas is replenished by heat exchange contact with the evaporating cryogenic liquid.
A device for evaporation of liquefied natural gas (LNG) on board a vessel. The device includes a pipeline through which LNG flows. The outside of the pipeline may be brought in contact with a heating medium, for example seawater. The pipeline is immersed in the sea and is connected to the vessel. The pipeline is enclosed by a shell through which seawater is pumped by a pump, which is operated by a motor on board the vessel.
A method and a system for supplying pressurized gas from a liquefied-gas (LG) storage tank, the method including the steps of: (a) providing a system including: (i) a storage tank for storing liquefied gas, the tank having a lower liquid region and a vapor region thereover; (ii) a heat exchanger external to the storage tank; (iii) pumping means driven by a liquid; (iv) a line for directly transferring the vaporized gas from the heat exchanger to the consumer; (b) pumping at least a portion of the liquefied gas from the lower region to the heat exchanger using the pumping means; (c) heating the liquefied gas in the heat exchanger to produce the vaporized gas; and (d) supplying the vaporized gas directly to the consumer, according to consumer demand.
