Mpaka pano, zochitika zogwiritsa ntchito cryogenic zomwe zimafuna kusindikiza ma valve a njira ziwiri zakhala zikugwiritsa ntchito mitundu iwiri ya mavavu, omwe ndi ma valve a globe ndi ma valve okhazikika a mpira / ma valve okwera pamwamba okhazikika.Komabe, ndi chitukuko chabwino cha njira ziwiri za cryogenic ball valve, opanga makina apeza njira yowoneka bwino kuposa mavavu ampira achikhalidwe-mavavu a mpira oyandama.Ili ndi kuthamanga kwapamwamba kwambiri, ilibe choletsa pamayendedwe othamanga ndi njira yosindikizira ya sing'anga, ndipo imatha kugwira ntchito motetezeka muzochitika za cryogenic.Ndipo kukula kwake ndi kochepa, kulemera kwake kumakhala kopepuka, ndipo kapangidwe kake ndi kosavuta.
Zochitika zogwiritsira ntchito Cryogenic zomwe zimafuna ma valves zimaphatikizapo kulowetsa / kutuluka kwa akasinja osungira kuti mudzaze ndi kutulutsa, kukakamiza mapaipi opanda kanthu otsekedwa, gasification ndi liquefaction, mapaipi azinthu zambiri zamakina osiyanasiyana m'malo opangira LNG, makina otumizira, ndi akasinja, Makina ogawa, kupopera. masiteshoni ndi malo odzaza mafuta a LNG, komanso ma valve amafuta achilengedwe (GVUs) okhudzana ndi injini zamafuta apamadzi pazombo.
Muzochitika zomwe tatchulazi, ma valve otseka njira ziwiri amagwiritsidwa ntchito kuwongolera ndi kutseka madzi apakati.Poyerekeza ndi mitundu ina mongama valve a mpira, ali ndi mavuto angapo:
The flow coefficient (Cv) ndi yotsika-izi zidzakhudza kusankha kwa miyeso yonse yofunikira ndipo izikhala chopinga chomwe chingalepheretse kayendedwe ka makina.
· Kufunika kokonza ma actuators a mzere kuti agwire ntchito yotseka ndi kulamulira-poyerekeza ndi makina ozungulira a rectangular omwe amagwiritsidwa ntchito kulamulira ndi kugwiritsira ntchito ma valve a mpira ndi ma valve ena ozungulira, zida zamtunduwu zimakhala ndi zovuta kwambiri komanso zimakhala zodula.Mtengo ndi zovuta zamapangidwe a zida zonse za valve ndi actuator ndizodziwika kwambiri.
· Ngati valavu yotseka ikugwiritsidwa ntchito kuti azindikire ntchito yotseka mwadzidzidzi yofunikira ndi machitidwe ambiri a LNG, zovutazo zidzakhala zapamwamba kwambiri.
Kwa malo ang'onoang'ono a LNG (SSLNG), mavuto omwe ali pamwambawa adzakhala omveka bwino, chifukwa machitidwewa ayenera kukhala ang'onoang'ono, okwera mtengo, komanso othamanga kwambiri kuti athe kuchepetsa nthawi yotsegula ndi yotsitsa.
Kuthamanga kwa valavu ya mpira ndipamwamba kuposa ya valavu yapadziko lonse ya kukula kwake.Mwa kuyankhula kwina, iwo ndi ang'onoang'ono mu kukula popanda kukhudza kuthamanga kwa kuthamanga.Izi zikutanthauza kuti kukula, kulemera ndi mtengo wa dongosolo lonse la mapaipi komanso ngakhale dongosolo lonse limachepetsedwa kwambiri.Panthawi imodzimodziyo, ikhoza kuonjezera kwambiri kubwerera kwa ndalama (ROI) ya machitidwe okhudzana.
Zoonadi, ma valve oyandama amtundu wa cryogenic ndi njira imodzi, yomwe siili yoyenera pazochitika zomwe tazitchula pamwambapa zomwe zimafuna kusindikiza ma valve awiri.
Njira imodzi Vs Njira ziwiri
Monga momwe tawonetsera pa Chithunzi 1, valavu yoyandama yoyandama ya mikhalidwe ya cryogenic imakhala ndi dzenje lothandizira kumtunda kwa mpira wa valve kuti zisawonongeke kuti zisachulukane ndikukwera pamene sing'anga ikusintha.Vavu ikakhala pamalo otsekedwa, mpweya wonyezimira womwe umatsekeredwa m'bowo la valavu umayamba kusungunuka ndikukula, ndipo voliyumuyo imatha kufika nthawi 600 kuposa voliyumu yoyambirira itatha kukulitsidwa, zomwe zingayambitse kuphulika kwa valve. .Pofuna kupewa izi, ma valve ambiri oyandama oyandama atengera njira yolumikizira kumtunda kwa mtsinje.Chifukwa cha izi, ma valve amtundu wa mpira sangathe kugwiritsidwa ntchito pazochitika zomwe zimafuna kusindikiza njira ziwiri.
Ndipo iyi ndi sitepe yomwe njira ziwiri za cryogenic float mpira valve zingasonyeze luso lake.Kusiyana pakati pa valavu iyi ndi valavu imodzi ya cryogenic ndi:
· Palibe kutsegula pa mpira wa valve kuti muchepetse kupanikizika
• Imatha kusindikiza madzimadzi mbali zonse ziwiri
· Palibe kutsegula pa mpira wa valve kuti muchepetse kupanikizika
• Imatha kusindikiza madzimadzi mbali zonse ziwiri
Mu njira ziwiri za cryogenic float ball valve, mpando wa valve wodzadza ndi masika wolowera mbali ziwiri umalowa m'malo mwa njira yotsegulira mtsinje.Mpando wa valavu wodzaza masika ukhoza kumasula mphamvu yochulukirapo yopangidwa ndi mpweya wachilengedwe wosungunuka womwe uli mkati mwa valavu, motero kuletsa valavu kuphulika, monga momwe tawonetsera pa Chithunzi 2.
Kuphatikiza apo, mpando wa valve wodzaza masika umathandizira kuti valavu ikhale yocheperako komanso kuti igwire bwino ntchito m'mikhalidwe ya cryogenic.
Valve yamtundu wa cryogenic float ball valve ili ndi mphete yosindikizira ya graphite yachiwiri, kuti valavu ikhale ndi ntchito yotetezera moto.Pokhapokha ngati ngozi yowopsa imapangitsa kuti mbali za polima za valve ziwotche, chisindikizo chachiwiri sichingagwirizane ndi sing'anga.Pakachitika ngozi, chisindikizo chachiwiri chidzakwaniritsa ntchito ya chitetezo cha moto.
Ubwino wa mavavu anjira ziwiri
Poyerekeza ndi ma valve a globe, ma valve okhazikika komanso okwera pamwamba, njira ziwiri za cryogenic float ball valve zili ndi ubwino wonse wa valve yothamanga kwambiri, ndipo palibe choletsa pamadzi ndi kusindikiza.Ikhoza kugwiritsidwa ntchito mosamala muzochitika za cryogenic;kukula kwake kuli kochepa ndipo kapangidwe kake ndi kosavuta.Cholumikizira chofananira chimakhalanso chosavuta (kuzungulira kumanja) komanso chocheperako.Ubwinowu umatanthauza kuti dongosolo lonselo ndi laling'ono, lopepuka, komanso lopanda ndalama zambiri.
Poyerekeza ndi ma valve a globe, ma valve okhazikika komanso okwera pamwamba, njira ziwiri za cryogenic float ball valve zili ndi ubwino wonse wa valve yothamanga kwambiri, ndipo palibe choletsa pamadzi ndi kusindikiza.Ikhoza kugwiritsidwa ntchito mosamala muzochitika za cryogenic;kukula kwake kuli kochepa ndipo kapangidwe kake ndi kosavuta.Cholumikizira chofananira chimakhalanso chosavuta (kuzungulira kumanja) komanso chocheperako.Ubwinowu umatanthauza kuti dongosolo lonselo ndi laling'ono, lopepuka, komanso lopanda ndalama zambiri.
Table 1 ikufanizira valavu ya mpira woyandama wa cryogenic ndi ma valve ena omwe ali ndi ntchito zofanana ndi momwe amachitira, kukula, kulemera kwake, mlingo wa torque, zovuta zolamulira, ndi mtengo wake wonse, ndikufotokozera mwachidule ubwino ndi zovuta zake.
Ngati malo ang'onoang'ono a LNG aphwanya msonkhanowo ndikutengera njira ziwiri za cryogenic mpira valve, akhoza kupereka masewera athunthu ku ubwino wapadera wa valavu ya mpira, ndiko kuti, m'mimba mwake, kuthamanga kwambiri komanso kutulutsa kwapaipi.Kunena zoona, imatha kuthandizira mapaipi ang'onoang'ono pomwe ikusunga kuchuluka kwake kofanana, kotero imatha kuchepetsa voliyumu yonse, kulemera kwake, ndi zovuta zake, komanso kuchepetsa mtengo wapaipi.
Nkhani yapitayi inafotokoza ubwino wogwiritsidwa ntchito ngati valve yotseka.Ngati agwiritsidwa ntchito ngati valve yolamulira, ubwino wake udzakhala woonekeratu.Ngati valavu yozungulira yozungulira yozungulira ikugwiritsidwa ntchito, zovuta za valve automation kit zidzachepetsedwa kwambiri, choncho zakhala chinthu chosankha cha cryogenic system.
Zomwe zili pamwambazi ndizosavuta komanso zothandiza ziwiri za cryogenic float ball valve, ndi rectangular rotary actuator yokhala ndi mawonekedwe osavuta komanso okwera mtengo kwambiri.
Mwachidule, njira ziwiri za cryogenic float ball valve zili ndi "zosokoneza" zofunikira pa dongosolo la mapaipi a cryogenic.M'maofesi ang'onoang'ono a LNG, imatha kupereka kusewera kwathunthu pazabwino zake.
M'zaka zingapo zapitazi, chinthu chatsopanochi chatsimikiziridwa muzochita zothandiza, kutsimikizira kuti ndizofunika kwambiri pa mtengo wa polojekiti komanso ntchito yodalirika ya nthawi yayitali.
Nthawi yotumiza: Jun-17-2021