Regasification system and method
AssigneeHamworthy KSE AB
InventorPer Helge Madsen
Life of this patent
Estimating the term…
Abstract
The present invention provides a novel regasification method and system in which the evaporative coolant is forced through an evaporation and condensation cycle, allowing control of the evaporative coolant condensation pressure; thus yielding a more flexible and more compact regasification system than those of the prior art.
Claims22
A method for regasification of liquid natural gas (LNG) aboard a floating carrier vessel before the LNG is offloaded as a gas, said method comprising:
- boosting the LNG pressure and flowing said LNG into an LNG/coolant heat exchanger (230) in which the LNG is evaporated;
- flowing evaporated natural gas (NG) into an NG/steam heat exchanger (120), in which the NG is heated before the NG is transferred to shore as superheated vapor;
- evaporating the LNG in said LNG/coolant heat exchanger (230) by thermal exchange against a coolant entering said heat exchanger as a gas and leaving said heat exchanger in a liquefied state;
- and
- flowing said coolant in a closed coolant circuit including a valve (225), and through at least one coolant/seawater heat exchanger (220a, 220b) in which the liquefied coolant is evaporated before entering the LNG/coolant heat exchanger, and wherein the pressure in the evaporated coolant is controlled by the valve (225).
A method for regasification of liquid natural gas (LNG) aboard a floating carrier vessel before the LNG is offloaded as a natural gas, said method comprising:
- boosting the LNG pressure and flowing said LNG into an LNG/coolant heat exchanger (230) in which the LNG is evaporated;
- flowing evaporated natural gas (NG) into an NG/steam heat exchanger (120), in which the NG is heated before the NG is transferred to shore as superheated vapor;
- evaporating the LNG in said LNG coolant heat exchanger (23O) by thermal exchange against a coolant entering said heat exchanger as a gas and leaving said heat exchanger in a liquefied state;
- and
- flowing said coolant in a closed coolant circuit and through at least one coolant/seawater heat exchanger (220a, 220b) in which the liquefied coolant is evaporated before entering the LNG/coolant heat exchanged wherein the pressure in the evaporated coolant is controlled by a valve (225) and wherein said coolant temperature is controlled by means of a bypass (231, 232, 233) on said LNG/coolant heat exchanger.
A liquid natural gas (LNG) regasification system for installation aboard a floating carrier vessel, said system comprising:
- an LNG/coolant heat exchanger (230) for evaporation of the LNG;
- a booster pump (110) for boosting the pressure in the LNG prior to entering the LNG/coolant heat exchanger (230);
- a natural gas (NG)/steam heat exchanger (120) for heating the NG before the NG is transferred to shore as superheated vapor;
- and
- at least one closed coolant circuit comprising at least one coolant/seawater heat exchanger (220a, 220b) for evaporation of the liquefied coolant before said coolant is flowed into the LNG/coolant heat exchanger (230), said closed coolant circuit further comprising a valve (225) for controlling the pressure in the evaporated coolant, whereby the coolant evaporation temperature may be controlled.
A method for regasification of liquid natural gas (LNG) aboard a floating carrier vessel before the LNG is offloaded as a gas, the method comprising:
- boosting the LNG pressure and flowing the LNG into an LNG/coolant heat exchanger in which the LNG is evaporated;
- flowing evaporated natural gas (NG) into an NG/steam heat exchanger, in which the NG is heated before the NG is transferred to shore as superheated vapor;
- evaporating the LNG in the LNG/coolant heat exchanger by thermal exchange against a coolant entering the heat exchanger as gas and leaving the heat exchange in a liquefied state;
- and
- flowing the coolant in a closed coolant circuit and through at least one coolant/seawater heat exchanger in which the liquefied coolant is evaporated before entering the LNG/coolant heat exchanger, wherein the coolant circuit comprises a valve for controlling the pressure in the evaporated coolant.
A method for regasification of liquid natural gas (LNG) aboard a floating carrier vessel before the LNG is offloaded as a gas, the method comprising:
- boosting the LNG pressure and flowing the LNG into an LNG/coolant heat exchanger in which the LNG is evaporated;
- flowing evaporated natural gas (NG) into an NG/steam heat exchanger, in which the NG is heated before the NG is transferred to shore as superheated vapor;
- evaporating the LNG in the LNG/coolant heat exchanger by thermal exchange against a coolant entering the heat exchanger as gas and leaving the heat exchanger in a liquefied state;
- flowing the coolant in a closed coolant circuit and through at least one coolant/seawater heat exchanger in which the liquefied coolant is evaporated before entering the LNG/coolant heat exchanger;
- and
- controlling the coolant temperature by means of a bypass on the LNG/coolant heat exchanger.
A liquid natural gas (LNG) regasification system for installation aboard a floating carrier vessel, the system comprising:
- an LNG/coolant heat exchanger for evaporation of the LNG;
- a booster pump for boosting the pressure in the LNG prior to entering the LNG/coolant heat exchanger;
- a natural gas (NG)/steam heat exchanger for heating the NG before the NG is transferred to shore as superheated vapor;
- and a closed coolant circuit including:
- at least one coolant/seawater heat exchanger for evaporation of the liquefied coolant before the coolant is flowed into the LNG/coolant heat exchanger;
- and
- a valve for controlling the pressure in the evaporated coolant, whereby the coolant evaporation temperature may be controlled.
A liquid natural gas (LNG) regasification system for installation aboard a floating carrier vessel, the system comprising:
- an LNG/coolant heat exchanger, including a bypass, for evaporation of the LNG;
- a booster pump for boosting the pressure in the LNG prior to entering the LNG/coolant heat exchanger;
- a natural gas (NG)/steam heat exchanger for heating the NG before the NG is transferred to shore as superheated vapor;
- and
- a closed coolant circuit comprising at least one coolant/seawater heat exchanger for evaporation of the liquefied coolant before the coolant is flowed into the LNG/coolant heat exchanger;
- wherein the coolant temperature is controlled by means of the bypass on the LNG/coolant heat exchanger.
Dependencies are inferred from the claim text.