System and process for transporting LNG by non-self-propelled marine LNG carrier
First Claim
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1. A method of operating a marine liquefied natural gas (LNG) carrier in which LNG is carried in at least one tank, said method comprising:
- removing gas composed of evaporated LNG from a vapor space of the at least one tank;
feeding a first portion of the gas to at least one gas consuming prime mover of the LNG carrier;
increasing a pressure of a second portion of the gas;
re-liquefying the second portion of the gas by heat exchange; and
feeding the re-liquefied second portion of the gas into the at least one tank in such a manner that some of the re-liquefied second portion of the gas evaporates as it is being fed into the at least one tank, whereby the vapor space of the at least one tank is cooled.
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Abstract
Marine LNG carrier and method of operating the marine LNG carrier. The LNG carrier carries LNG in at least one tank. Gas composed of evaporated LNG within the at least one tank is removed. The gas is fed to at least one gas consuming prime mover of the LNG carrier. Power is provided with the at least one gas consuming prime mover. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way.
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Citations
29 Claims
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1. A method of operating a marine liquefied natural gas (LNG) carrier in which LNG is carried in at least one tank, said method comprising:
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removing gas composed of evaporated LNG from a vapor space of the at least one tank; feeding a first portion of the gas to at least one gas consuming prime mover of the LNG carrier;
increasing a pressure of a second portion of the gas;re-liquefying the second portion of the gas by heat exchange; and feeding the re-liquefied second portion of the gas into the at least one tank in such a manner that some of the re-liquefied second portion of the gas evaporates as it is being fed into the at least one tank, whereby the vapor space of the at least one tank is cooled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24)
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21. A marine liquefied natural gas (LNG) carrier comprising:
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at least one tank storing LNG; at least one LNG gas consuming prime mover; an arrangement for removing gas composed of evaporated LNG from a vapor space of the at least one tank; an arrangement for feeding a first portion of the gas to the at least one gas consuming prime mover; an arrangement for increasing a pressure of a second portion of the gas; an arrangement for re-liquefying the second portion of the gas by heat exchange; and an arrangement for feeding the re-liquefied second portion of the gas into the at least one tank in such a manner that some of the re-liquefied second portion of the gas evaporates as it is being fed into the at least one tank, whereby the vapor space of the at least one tank is cooled. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification