IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0264712
(2002-10-04)
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발명자
/ 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
3 인용 특허 :
5 |
초록
▼
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 th
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.
대표청구항
▼
1. 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
1. 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). 2. 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. 3. The method of claim 1, wherein the number of at least one coolant/seawater heat exchangers is two.4. The method of claim 1, wherein the coolant is propane.5. The method of claim 1, wherein the coolant is a medium having a boiling temperature of 0° C. at any pressures between 2 bar and 25 bar.6. The method of claim 1, wherein the LNG/coolant heat exchanger is a stainless steel compact printed circuit heat exchanger (PCHE).7. The method of claim 1, wherein the NG/steam heat exchanger is an SS316 shell and tube heat exchanger.8. The method or claim 1, wherein the at least one coolant/seawater heat exchanger is at least one titanium plate heat exchanger.9. The method of claim 1, wherein the coolant is flowed through said circuit by a pumping means (210).10. 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. 11. The regasification system of claim 10, wherein the at least one coolant circuit comprises at least two coolant/seawater heat exchangers (220a, 220b).12. The regasification system of claim 10, wherein said coolant temperature is controlled by means of a bypass (231, 232, 233) on said LNG/coolant heat exchanger.13. The regasification system of claim 10, wherein the coolant is propane.14. The regasification system of claim 10, wherein the coolant is a medium having a boiling temperature of 0° C. at any pressures between 2 bar and 25 bar.15. The regasification system of claim 10, wherein the LNG/coolant heat exchanger is a stainless steel compact printed circuit heat exchanger (PCHE).16. The regasification system of claim 10, wherein the NG/steam heat exchanger is an SS316 shell an tube heat exchanger.17. The regasification system of claim 10, wherein the at least one coolant/seawater heat exchanger is at least one titanium plate heat exchanger.18. The regasification system of claim 10, wherein the coolant is flowed through said circuit by a pumping means (210).19. 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. 20. 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. 21. 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. 22. 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.
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