Patent SG-11201909179V-A (SG)
Title: Method for controlling a plural stage compressor
Inventor: DARRY MARINA
IPC: F04D17/12
Filed: 2018-04-05
Abstract: WO 18/197 17 4 Al (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 01 November 2018 (01.11.2018) WIPO I PCT ill 1111u°11111VIIIVIIIVIIIolo VIII VIII oimIE (10) International Publication Number WO 2018/197174 Al (51) International Patent Classification: FO4D 17/12 (2006.01) FO4D 27/02 (2006.01) FO4D 17/14 (2006.01) (21) International Application Number: PCT/EP2018/058704 (22) International Filing Date: 05 April 2018 (05.04.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 17168535.7 27 April 2017 (27.04.2017) EP (71) Applicant: CRYOSTAR SAS [FR/FR]; 2 Rue de I'ndustrie, 80331 Paris (FR). (72) Inventors: DARRY, Marina; 32B me des grains, 68200 MULHOUSE (FR). HELIOT, Cyril; 5 Rue du Moulin, 68130 Hundsbach (FR). (74) Agent: RICHMOND, Sarah; The BOC Group Limited, The Priestley Centre, 10 Priestley Road, The Surrey Re- search Park, Guildford, Surrey GU2 7XY (GB). (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, 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). Published: — with international search report (Art. 2 I (3)) (54) Title: METHOD FOR CONTROLLING A PLURAL STAGE COMPRESSOR (57) : Method for controlling a plural stage compressor comprising at least a first stage (10), a second stage (20) and a first inter-stage line (12) between the first stage (10) and the second stage (20), comprising the steps of: a- measuring the temperature at the inlet of the compressor, b- measuring the ratio between the outlet pressure (Pout) and the inlet pressure (Pin) of the first stage (10) of the compressor, c- calculating a coefficient ('P) based at least on the value of the inlet temperature (Tin) and on the measured pressure ratio (Pout/Pin), d- if the calculated coefficient ('P) is in a predetermined range, acting on a control valve (70; 76; 92) mounted in a line (4; 8) supplying the inlet of the first stage (10) of the compressor or in a gas recycle line (74) which opens into the first inter-stage line (12).