Hauv lub cev conveying system, cov kua dejLub Qhov Kub Siabyog ib qho khoom tswj hwm tseem ceeb, uas feem ntau muaj cov haujlwm ntawm kev tswj hwm, kev hloov pauv, kev tiv thaiv rov qab, kev txiav tawm, thiab kev sib hloov. Lub valve siv dav hauv kev lag luam thiab kev ua haujlwm pej xeem. Lub valve kub siab yog ib hom uas feem ntau siv hauv cov li qub. Nws cov yam ntxwv tshwj xeeb yog raws li nram no: kev ua haujlwm zoo quenching, tuaj yeem ua tiav quenching tob; weldability zoo; kev nqus tau zoo ntawm kev cuam tshuam, nws nyuaj rau ua puas tsuaj los ntawm kev ua phem; Temper brittleness feem ntau yuav tsawg dua thiab lwm yam. Muaj ntau hom ntawm cov li qub kub siab. Qhov feem ntau yog cov kub siabNpauj npaim li qub, kub heevCov pob valve, cov lim dej kub siab, thiab cov kub siabCov qhov rooj vag.
Cov Hom Valve ntawm Cov Valves Kub Siab yog dab tsi?
Cov qhov dej kub muaj xws li cov qhov dej kub, cov qhov dej kaw qhov kub, cov qhov dej kuaj qhov kub, cov qhov dej pob kub, cov qhov dej npauj npaim kub, cov qhov dej koob kub, cov qhov dej throttle kub, thiab cov qhov dej txo qhov siab kub. Ntawm lawv, cov uas siv ntau tshaj plaws yog cov qhov dej rooj vag, cov qhov dej ntiaj teb, cov qhov dej kuaj, cov qhov dej pob thiab cov qhov dej npauj npaim.
Cov xwm txheej ua haujlwm ntawm Cov Qhov Kub Siab yog dab tsi?
Cov xwm txheej ua haujlwm kub siab feem ntau suav nrog qhov kub qis dua, kub siab Ⅰ, kub siab Ⅱ, kub siab Ⅲ, kub siab Ⅳ, thiab kub siab Ⅴ, uas yuav raug qhia cais hauv qab no.
Kub qis dua
Qhov kub qis dua txhais tau tias qhov kub ua haujlwm ntawm lub valve yog nyob rau hauv thaj tsam ntawm 325 ~ 425 ℃. Yog tias cov khoom nruab nrab yog dej thiab pa, WCB, WCC, A105, WC6 thiab WC9 feem ntau yog siv. Yog tias cov khoom nruab nrab yog cov roj sulfur, C5, CF8, CF3, CF8M, CF3M, thiab lwm yam, uas tiv taus sulfide corrosion, feem ntau yog siv. Lawv feem ntau siv rau hauv cov khoom siv atmospheric thiab siab txo thiab cov khoom siv coking qeeb hauv cov chaw ua roj. Lub sijhawm no, cov li qub ua los ntawm CF8, CF8M, CF3 thiab CF3M tsis yog siv rau kev tiv thaiv corrosion ntawm cov kua qaub, tab sis siv rau cov khoom siv roj uas muaj sulfur thiab cov kav dej roj thiab roj. Hauv qhov xwm txheej no, qhov kub ua haujlwm siab tshaj plaws ntawm CF8, CF8M, CF3 thiab CF3M yog 450 ° C.
Kub siab Ⅰ
Thaum qhov kub ua haujlwm ntawm lub valve yog 425 ～ 550 ℃, nws yog chav kawm kub siab I (hu ua chav kawm PI). Cov khoom siv tseem ceeb ntawm PI qib valve yog "kub siab Ⅰ qib nruab nrab carbon chromium nickel tsis tshua muaj av titanium zoo kub-resistant hlau" nrog CF8 ua cov duab yooj yim hauv ASTMA351 tus qauv. Vim tias qib PI yog lub npe tshwj xeeb, lub tswv yim ntawm kub siab stainless hlau (P) suav nrog ntawm no. Yog li ntawd, yog tias qhov nruab nrab ua haujlwm yog dej lossis pa, txawm hais tias kub siab hlau WC6 (t≤540 ℃) lossis WC9 (t≤570 ℃) kuj tseem siv tau, thaum cov roj sulfur-muaj cov khoom kuj tseem siv tau kub siab hlau C5 (ZG1Cr5Mo), tab sis Lawv tsis tuaj yeem hu ua PI-chav kawm ntawm no.
Kub siab II
Qhov kub ua haujlwm ntawm lub valve yog 550 ～ 650 ℃, thiab nws yog cais ua qhov kub siab Ⅱ (hu ua P Ⅱ). PⅡ chav kawm kub siab valve feem ntau yog siv rau hauv cov roj hnyav catalytic cracking device ntawm refinery. Nws muaj cov ntaub ntawv kub siab hnav-resistant rooj vag valve siv rau hauv peb-tig nozzle thiab lwm yam khoom. Cov khoom siv tseem ceeb ntawm PⅡ qib valve yog "kub siab Ⅱ qib nruab nrab carbon chromium nickel tsis tshua muaj av titanium tantalum reinforced kub-resistant hlau" nrog CF8 ua cov duab yooj yim hauv ASTMA351 tus qauv.
Kub siab III
Qhov kub ua haujlwm ntawm lub valve yog 650 ～ 730 ℃, thiab nws yog cais ua qhov kub siab III (hu ua PⅢ). PⅢ chav kawm kub siab valves feem ntau yog siv rau hauv cov roj loj hnyav catalytic cracking units hauv refineries. Cov khoom siv tseem ceeb ntawm PⅢ chav kawm kub siab valve yog CF8M raws li ASTMA351.
Kub siab Ⅳ
Qhov kub ua haujlwm ntawm lub valve yog 730 ～ 816 ℃, thiab nws raug ntsuas tias kub siab IV (hu ua PIV luv luv). Qhov txwv siab tshaj plaws ntawm qhov kub ua haujlwm ntawm PIV valve yog 816 ℃, vim tias qhov kub siab tshaj plaws uas tus qauv ASMEB16134 qib siab-kub xaiv rau kev tsim valve yog 816 ℃ (1500υ). Tsis tas li ntawd, tom qab qhov kub ua haujlwm tshaj 816 ° C, cov hlau yuav luag nkag mus rau thaj chaw kub forging. Lub sijhawm no, cov hlau nyob hauv thaj chaw yas deformation, thiab cov hlau muaj plasticity zoo, thiab nws nyuaj rau tiv taus qhov siab ua haujlwm siab thiab lub zog cuam tshuam thiab tiv thaiv nws kom tsis txhob deforming. Cov khoom siv tseem ceeb ntawm P Ⅳ valve yog CF8M hauv ASTMA351 tus qauv ua cov duab yooj yim "kub siab Ⅳ nruab nrab carbon chromium nickel molybdenum tsis tshua muaj av titanium tantalum reinforced heat-resistant steel". CK-20 thiab ASTMA182 tus qauv F310 (xws li C cov ntsiab lus ≥01050%) thiab F310H cov hlau tsis xeb uas tiv taus cua sov.
Kub siab Ⅴ
Qhov kub ua haujlwm ntawm lub valve siab dua 816 ℃, hu ua PⅤ, PⅤ lub valve kub siab (rau cov valve kaw, tsis tswj cov valve npauj npaim) yuav tsum tau txais cov txheej txheem tsim tshwj xeeb, xws li cov ntaub thaiv rwb thaiv tsev lossis dej lossis roj txias tuaj yeem ua kom lub valve ua haujlwm ib txwm. Yog li ntawd, qhov txwv siab tshaj plaws ntawm qhov kub ua haujlwm ntawm PⅤ chav kawm kub siab valve tsis tau teev tseg, vim tias qhov kub ua haujlwm ntawm lub valve tswj tsis yog txiav txim siab los ntawm cov khoom siv xwb, tab sis los ntawm cov txheej txheem tsim tshwj xeeb, thiab lub hauv paus ntsiab lus ntawm txoj kev tsim qauv yog tib yam. PⅤ qib kub siab valve tuaj yeem xaiv cov ntaub ntawv tsim nyog uas tuaj yeem ua tau raws li lub valve raws li nws cov khoom siv ua haujlwm thiab kev ua haujlwm siab thiab cov txheej txheem tsim tshwj xeeb. Hauv PⅤ chav kawm kub siab valve, feem ntau lub flapper lossis npauj npaim valve ntawm lub flue flapper valve lossis npauj npaim valve feem ntau yog xaiv los ntawm HK-30 thiab HK-40 cov hlau kub siab hauv ASTMA297 tus qauv. Tiv taus corrosion, tab sis tsis tuaj yeem tiv taus kev poob siab thiab kev thauj khoom siab.
Lub sijhawm tshaj tawm: Lub Rau Hli-21-2021