LNG - Chitsulo chokwera cha manganese ndi malingaliro ake ofananira ndi kuwotcherera kwake

Mu 2010, POSCO ya South Korea, Daewoo Shipbuilding ndi magulu asanu akuluakulu padziko lonse lapansi adayambitsa ntchito ya "chitukuko chophatikizana chachitsulo chachitsulo cha manganese ndi zipangizo zowotcherera chifukwa cha kutentha kwambiri," ndipo adakwanitsa kupanga zitsulo zambiri za manganese kwa akasinja osungira LNG. 2015. Pofika June 2022, kuti athyole luso lamakono, Daewoo Shipbuilding & Marine Engineering (DSME) ya South Korea (DSME) ndi POSCO idzakhala yoyamba padziko lapansi kukhazikitsa matanki osungira mafuta a manganese a LNG pazitsulo zazikulu za LNG zoyendetsedwa ndi LNG. (VLCCs) Mwambo, ndipo adati apanga ukadaulo wopangira matanki amafuta kuchokera pakupangira zitsulo mpaka kuwotcherera ndi kupanga.

1. Kodi chitsulo chachikulu cha manganese ndi chiyani?

Chitsulo chachikulu cha manganese cha akasinja osungira a LNG ndi chitsulo cha aloyi chokhala ndi manganese pakati pa 22-25%, chomwe chimakhala ndi kutentha kochepa komanso kukana kuvala kwambiri, zomwe zikuwonekera kwambiri kuposa zida zama tank osungira LNG Ndiwokondedwa watsopano wa thanki yosungirako LNG. zida zomwe South Korea yapereka pakufufuza ndi chitukuko kwa zaka zopitilira khumi.

2.Kusanthula mwachidule kwa mitundu yachitsulo ndi ubwino ndi kuipa kwa akasinja osungira a LNG Zogwiritsira ntchito zowotcherera zofananira zimatha kukwaniritsa zofunikira izi: Popeza matanki akuluakulu osungira mafuta a LNG ndi zida zazikulu za zombo zowononga zachilengedwe komanso makina onse a LNG makampani, miyezo yaukadaulo ndi yokhwima kwambiri ndipo mtengo wake ndi wokwera mtengo. LNG nthawi zambiri imasungidwa ndi kunyamulidwa pansi pa kutentha kwambiri kwa -163 ° C. "International Code for Construction and Equipment of Sitima Zonyamula Magesi Osungunuka mu Bulk" imatchedwa "IGC Code". Zida zinayi zotsika kutentha zomwe zingagwiritsidwe ntchito pomanga LNG zikuphatikizapo: zitsulo zotayidwa, Austria Tensitic zitsulo zosapanga dzimbiri, austenitic Fe-Ni alloy steel (imadziwikanso kuti Invar steel) ndi 9% Ni chitsulo (onani Table 1 kuti mudziwe zambiri), pomwe 9% Ni chitsulo ndi chomwe chimagwiritsidwa ntchito kwambiri komanso chimagwiritsidwa ntchito kwambiri pama tanki osungira mafuta a LNG. Koma kuipa kwake ndikwakuti mtengo udakali wokwera, njira zogwirira ntchito ndizovuta, mphamvu ndizochepa, ndipo zomwe zili mu nickel ndizokwera. M'zaka zaposachedwa, mtengo wa nickel wapitirira kukwera, ndipo mtengo wamtengo wapatali wakula kwambiri.

Zida 4 za cryogenic zomwe zingagwiritsidwe ntchito pomanga LNG pansi pa "IGC Code"

Kuyerekeza kwamphamvu pakati pa zida zomwe zimagwiritsidwa ntchito nthawi zambiri za LNG ndi chitsulo chatsopano cha manganese

Chitsulo chotsika kwambiri cha manganese, chomwe chimaphatikiza mphamvu zambiri, kulimba kwambiri, komanso mtengo wotsika, chimakhala ndi chiyembekezo chogwiritsa ntchito m'tsogolomu LNG thanki yosungiramo mafuta komanso kuteteza zachilengedwe misika ina yosungiramo mafuta monga ammonia, madzi a hydrogen, ndi methanol.

Zofunikira pakupanga ndi magwiridwe antchito achitsulo chachikulu cha manganese

Chemical Composition (ASTM Draft)

Makhalidwe amakina

● Kapangidwe ka kristalo: matayala a nkhope centered kiyubiki (γ-Fe)

● Kutentha kovomerezeka＞-196℃

● Mphamvu zokolola＞400MPa (58ksi)

● Kulimba mtima: 800~970MPa (116-141ksi)

● Charpy V-notch impact test >41J pa -196℃(-320℉)

Kuyamba kwa kampani yathu yazitsulo zapamwamba za manganese zofananira ndi kuwotcherera

M'zaka zaposachedwapa, tadzipereka tokha kufufuza ndi chitukuko cha mkulu-manganese zitsulo zofananira kuwotcherera consumables kwa akasinja osungira LNG, ndi bwino kupanga kuwotcherera consumables kuti angagwirizane ndi katundu mkulu-manganese zitsulo m'munsi zipangizo akasinja osungira LNG. Makhalidwe enieni akuwonetsedwa mu Table 2.

Zimango katundu mkulu manganese zitsulo zofananira kuwotcherera consumables waikamo zitsulo

Ps.Metal ufa pachimake kumizidwa arc waya kuwotcherera kwa mkulu manganese zitsulo utenga wofananira flux GXR-200 kwa mkulu manganese chitsulo

Weldability ndi chitsanzo chitsanzo cha mkulu manganese zitsulo kuwotcherera consumables kwa akasinja osungira LNG

The weldability wa kuwotcherera consumables mkulu manganese zitsulo zikusonyeza motere

Electrode (GER-HMA) kuwotcherera kwa fillet yosalala pambuyo pochotsa slag 

Electrode (GER-HMA) kukwera ngodya yowotcherera pambuyo pochotsa slag    

Ndodo yowotcherera (GER-HMA) isanayambe kapena itatha kuchotsedwa kwa slag

Chitsulo chachitsulo chachitsulo chozama cha arc (GCR-HMA-S) weld chiwonetsero

Zitsanzo za high manganese zitsulo kuwotcherera ndodo ndodo zikuwonetsedwa motere 

Kuwotcherera kwa Flat Welding (1G) kuwonetsa zitsanzo zamphamvu 

Vertical Welding (3G) mwachitsanzo chowonetsera

Kuwotcherera kwa Flat (1G) zopindika zowonetsera

Kuwotcherera kwa Flat (1G) zopindika zowonetsera

PS. High manganese zitsulo ndi welded ndi kuwotcherera ndodo 1G ndi 3G, palibe ming'alu pa nkhope kupinda ndi kumbuyo kupinda zitsanzo, ndi kukana mng'alu ndi zabwino.