Kuze kube manje, izimo zokusetshenziswa kwe-cryogenic ezidinga ukuvalwa kwama-valve ngezindlela ezimbili ziye zasebenzisa kakhulu izinhlobo ezimbili zama-valve, okungukuthi ama-globe valve nama-fixed ball valve/ama-top mounted fixed ball valve. Kodwa-ke, ngokuthuthukiswa okuphumelelayo kwe-two-way cryogenic ball valve, abaklami besistimu bathole inketho ekhangayo kakhulu kune-ball valve yendabuko-amavalvu ebhola antantayoInesilinganiso sokugeleza esiphezulu, ayinawo umkhawulo endleleni yokugeleza kanye nendlela yokuvala ye-medium, futhi ingasebenza ngokuphephile ezimweni ezi-cryogenic. Futhi usayizi mncane, isisindo silula, futhi isakhiwo silula.
Izimo zokusetshenziswa kwe-cryogenic ezidinga ama-valve zifaka phakathi ukungena/ukuphuma kwamatangi okugcina ukuze agcwalise futhi akhiphe, amapayipi angenalutho avaliwe acindezelwe, ukufaka igesi kanye noketshezi, amapayipi anezinjongo eziningi ezinhlelo ezahlukene eziteshini zokugcina ze-LNG, izinhlelo zokuthumela, kanye namathangi, Izinhlelo zokusabalalisa, iziteshi zokupompa kanye neziteshi zokugcwalisa uphethiloli ze-LNG, kanye nama-valve egesi yemvelo (ama-GVU) ahlobene nezinjini ezisebenzisa uphethiloli ophindwe kabili emikhunjini.
Ezimweni zokusetshenziswa ezishiwo ngenhla, ama-valve okuvala amabili ngokuvamile asetshenziswa ukulawula nokuvala uketshezi oluphakathi. Uma kuqhathaniswa nezinhlobo ezihlukile ezifanaamavalvu ebhola, banezinkinga eziningana:
I-flow coefficient (Cv) iphansi - lokhu kuzothinta ukukhethwa kwawo wonke amasayizi amapayipi afanele futhi kuzoba yisithiyo esingaba khona esivimbela amandla okugeleza kohlelo.
· Kudingeka ulungiselele ama-actuator aqondile ukuze enze imisebenzi yokuvala nokulawula - uma kuqhathaniswa nama-actuator ajikelezayo angunxande asetshenziselwa ukulawula nokusebenzisa ama-ball valve kanye namanye ama-rotary valve angunxande, lolu hlobo lwemishini lunesakhiwo esiyinkimbinkimbi kakhulu futhi luyabiza. Izindleko kanye nobunzima besakhiwo sesethi ephelele yemishini yama-valve kanye ne-actuator kuvelele kakhulu.
· Uma ivalvu yokuvala isetshenziswa ukufeza umsebenzi wokuvala ophuthumayo odingwa izinhlelo eziningi ze-LNG, ubunzima buzoba bukhulu nakakhulu.
Ezindaweni ezincane ze-LNG (SSLNG), izinkinga ezingenhla zizoba sobala kakhulu, ngoba lezi zinhlelo kumele zibe zincane, zisebenzise kahle imali, futhi zibe namandla amakhulu okugeleza ukuze kufinyezwe umjikelezo wokulayisha nokulayisha.
I-flow coefficient ye-ball valve iphakeme kuneye-globe valve enobukhulu obufanayo. Ngamanye amazwi, zincane ngobukhulu ngaphandle kokuthinta izinga lokugeleza. Lokhu kusho ukuthi ubukhulu, isisindo kanye nezindleko zesistimu yonke yamapayipi ngisho nesistimu yonke kuncishiswe kakhulu. Ngesikhathi esifanayo, kungakhuphula kakhulu imbuyiselo ekutshalweni kwezimali (ROI) kwezinhlelo ezihlobene.
Yiqiniso, ama-valve ebhola ajwayelekile e-cryogenic float ayindlela eyodwa, okuyinto engafaneleki ezimweni ezishiwo ngenhla ezidinga ukuvalwa kwama-valve ngezindlela ezimbili.
Indlela eyodwa vs indlela ezimbili
Njengoba kuboniswe kuMfanekiso 1, ivalvu yebhola elintantayo ejwayelekile yezimo ze-cryogenic inembobo yokukhulula ingcindezi ohlangothini oluphezulu lwebhola levalvu ukuvimbela ingcindezi ukuthi ingaqongelelani futhi ikhuphuke lapho i-medium ishintsha isigaba. Lapho ivalvu isesimweni esivaliwe, igesi yemvelo emanzi evalelwe emgodini womzimba wevalvu izoqala ukuhwamuka futhi ikhule, futhi ivolumu ingafinyelela izikhathi ezingu-600 zevolumu yokuqala ngemva kokunwetshwa ngokugcwele, okungabangela ukuthi ivalvu iqhume. Ukuze kuvinjelwe lesi simo, amavalvu amaningi ebhola elintantayo ajwayelekile asebenzise indlela yokukhulula ingcindezi yokuvula engenhla. Ngenxa yalokhu, amavalvu ebhola endabuko awakwazi ukusetshenziswa ezimweni ezidinga ukuvalwa ngezindlela ezimbili.
Futhi lesi yisigaba lapho ivalvu yebhola entantayo ye-cryogenic enezindlela ezimbili ingabonisa khona amakhono ayo. Umehluko phakathi kwale valve kanye nevalvu ejwayelekile ye-cryogenic enezindlela eyodwa yile:
· Akukho kuvula ebholeni levalvu ukuze kuncishiswe ingcindezi
· Ingavala uketshezi kuzo zombili izinhlangothi
· Akukho kuvula ebholeni levalvu ukuze kuncishiswe ingcindezi
· Ingavala uketshezi kuzo zombili izinhlangothi
Ku-valve yebhola entantayo enezindlela ezimbili ecryogenic, isihlalo se-valve esinezindlela ezimbili esithwala ingcindezi sithatha indawo yendlela yokukhulula ingcindezi yokuvula engenhla. Isihlalo se-valve esinezindlela ezimbili singakhulula ingcindezi enkulu ekhiqizwa yigesi yemvelo emanzi evalelwe emgodini womzimba we-valve, ngaleyo ndlela ivimbele i-valve ukuthi ingaqhumi, njengoba kuboniswe kuMfanekiso 2.
Ngaphezu kwalokho, isihlalo sevalvu esifakwe entwasahlobo sisiza ukugcina ivalvu isezingeni eliphansi futhi ifeze ukusebenza okubushelelezi ezimweni ezibucayi.
I-valve yebhola entantayo enezindlela ezimbili ihlonyiswe ngendandatho yokuvala i-graphite yesigaba sesibili, ukuze i-valve ibe nomsebenzi wokuphepha komlilo. Ngaphandle kokuthi ingozi embi kakhulu ibangele ukuthi izingxenye ze-polymer ze-valve zishise, uphawu lwesibili ngeke luthintane nomthombo. Uma kwenzeka ingozi, uphawu lwesigaba sesibili luzofeza umsebenzi wokuvikela ukuphepha komlilo.
Izinzuzo zamavalvu anezindlela ezimbili
Uma kuqhathaniswa nama-globe valve, ama-fixed and top-mounted fixed ball valve, i-two-way cryogenic float ball valve inazo zonke izinzuzo ze-high flow coefficient ball valve, futhi akukho mingcele ekuqondeni koketshezi kanye nokuvala. Ingasetshenziswa ngokuphephile ezimweni ze-cryogenic; usayizi mncane kakhulu futhi isakhiwo silula kakhulu. I-actuator ehambisanayo nayo ilula kakhulu (ukujikeleza kwe-engeli yesokudla) futhi incane kakhulu. Lezi zinzuzo zisho ukuthi lonke uhlelo luncane, lulula, futhi lungabizi kakhulu.
Uma kuqhathaniswa nama-globe valve, ama-fixed and top-mounted fixed ball valve, i-two-way cryogenic float ball valve inazo zonke izinzuzo ze-high flow coefficient ball valve, futhi akukho mingcele ekuqondeni koketshezi kanye nokuvala. Ingasetshenziswa ngokuphephile ezimweni ze-cryogenic; usayizi mncane kakhulu futhi isakhiwo silula kakhulu. I-actuator ehambisanayo nayo ilula kakhulu (ukujikeleza kwe-engeli yesokudla) futhi incane kakhulu. Lezi zinzuzo zisho ukuthi lonke uhlelo luncane, lulula, futhi lungabizi kakhulu.
Ithebula 1 liqhathanisa ivalvu yebhola elintantayo eliyi-cryogenic enezindlela ezimbili namanye amavalvu anemisebenzi efanayo ngokombono wokugcinwa, usayizi, isisindo, izinga le-torque, ubunzima bokulawula, kanye nezindleko zizonke, futhi lifingqa ngokugcwele izinzuzo nezinkinga zalo.
Uma indawo encane ye-LNG iphula umthetho futhi isebenzisa i-valve yebhola e-cryogenic enezindlela ezimbili, inganikeza ukusebenza okugcwele ezinzuzweni ezihlukile ze-valve yebhola, okungukuthi, ububanzi obugcwele, izinga lokugeleza eliphezulu kanye nezinga eliphezulu lokukhishwa kwamapayipi. Uma sikhuluma ngokujwayelekile, singasekela amapayipi amancane ngenkathi sigcina izinga elifanayo lokugeleza, ngakho-ke singanciphisa ivolumu iyonke, isisindo, kanye nobunzima besistimu, futhi singanciphisa nezindleko zesistimu yamapayipi.
Isihloko esedlule sethule izinzuzo zokusetshenziswa njengevalvu yokuvala. Uma isetshenziswa njengevalvu yokulawula, izinzuzo zizoba sobala kakhulu. Uma kusetshenziswa ivalvu yebhola ejikelezayo ekhoneni elingakwesokudla, ubunzima bekhithi yokuzenzakalela kwevalvu buzoncishiswa kakhulu, ngakho-ke sekuyinto yokuzikhethela ohlelweni lwe-cryogenic.
Okuqukethwe okuyisisekelo kakhulu kwekhithi yokuzenzakalela okukhulunywe ngayo ngenhla ivalvu yebhola egoqekayo ye-cryogenic elula nesebenzayo, kanye ne-actuator ejikelezayo engunxande enesakhiwo esilula kanye nokusebenza kahle okubiza kakhulu.
Ngamafuphi, i-valve yebhola e-cryogenic float enezindlela ezimbili inokubaluleka "okuphambeneyo" ohlelweni lwamapayipi e-cryogenic. Ezindaweni ezincane ze-LNG, inganikeza izinzuzo zayo ngokugcwele.
Eminyakeni embalwa edlule, lo mkhiqizo omusha uqinisekiswe ngezicelo ezisebenzayo, okufakazela ukuthi ubaluleke kakhulu ezindleleni zephrojekthi kanye nokusebenza okuthembekile kwesikhathi eside kohlelo.
Isikhathi sokuthunyelwe: Juni-17-2021