Reliquefaction of boil-off from liquefied natural gas
US4843829A · kind A · utility
7Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Nov 3, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2290/62
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to an improved process for the reliquefaction of boil-off gas containing up to 10% nitrogen resulting from the evaporation of liquefied natural gas (LNG) contained in a storage vessel. In the process, a closed-loop nitrogen refrigeration cycle is utilized wherein the nitrogen is isenthalpically expanded under conditions for generating a liquid and vapor with the liquid being pressurized by pumping and warmed against an initially cooled boil-off stream. The boil-off LNG stream is initially cooled by indirect heat exchange with an isentropically expanded refrigerant stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.