Patent SG-11201906783T-A (SG)
Title: Increasing efficiency in an lng production system by pre-cooling a natural gas feed stream
Inventor: PIERRE FRITZ
IPC: F25J1/00
Filed: 2018-01-15
Abstract: FIG1200 62 602 606 604 20 66 ---27 302 14 -18 24 L22 12 1 70- 3 68 (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 16 August 2018 (16.08.2018) WIP0 I PCT mu °million °nolo olomoimmomoimimio oimIE (10) International Publication Number WO 2018/147974 Al (51) International Patent Classification: F25J 1/00 (2006.01) F25J 3/02 (2006.01) F25J 1/02 (2006.01) F25J 3/08 (2006.01) (21) International Application Number: PCT/US2018/013702 (22) International Filing Date: 15 January 2018 (15.01.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 62/458,131 13 February 2017 (13.02.2017) US (71) Applicant (for all designated States except US): EXXONMOBIL UPSTREAM RESEARCH COMPA- NY [US/US]; (EMHC-E2-4A-296), 22777 Springwoods Village Parkway, Spring, TX 77389 (US). (72) Inventor; and (71) Applicant US only): PIERRE, Fritz [US/US]; 18011 Bayou Mead Trail, Humble, TX 77346 (US). (74) Agent: JENSEN, Nathan, 0. et al.; Exxonmobil Upstream Research Company, (EMHC-E2-4A-296), 22777 Spring- woods Village Parkway, Spring, TX 77389 (US). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, (54) Title: INCREASING EFFICIENCY IN AN LNG PRODUCTION SYSTEM BY PRE-COOLING A NATURAL GAS FEED STREAM (57) : A liquefied natural gas production method and system using liquid nitrogen (12) as a primary refrigerant, the system comprising: a natural gas compressor (1202) that compresses a natural gas stream from a supply of natural gas (20); an ambient natural gas cooler (1204) to provide a cooled natural gas stream; a first heat exchanger (64) that exchanges heat between the cooled natural gas stream and an at least partially vaporized nitrogen stream to provide an additionally cooled natural gas stream; a work-producing natural gas expander (302) that expands the additionally cooled natural gas stream to form a chilled natural gas stream; a liquefied nitrogen stream (12) from a supply of liquefied nitrogen (14); a second heat exchanger (26,22) that exchanges heat between the liquefied nitrogen stream and the chilled natural gas stream to at least partially vaporize the liquefied nitrogen stream and at least partially condense the natural gas stream. [Continued on next page] WO 2018/147974 Al MIDEDIMODOMMERIOMMEEHROBRIMMIS OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Declarations under Rule 4.17: as to applicant's entitlement to apply for and be granted a patent (Rule 4.17(ii)) as to the applicant's entitlement to claim the priority of the earlier application (Rule 4.17(iii)) Published: — with international search report (Art. 21(3))