Boiler kav dej ua haujlwm nyob rau hauv qee qhov kev xav tau tshaj plaws hauv kev lag luam, qhov chaw siab kub, sab hauv siab, thermal cycling, thiab corrosion ua ib txhij. Tsis zoo li cov txheej txheem cov kav dej, cov raj boiler yuav tsum muaj kev ruaj ntseg ntawm cov neeg kho tshuab ntawm qhov kub thiab txias rau lub sij hawm ntev yam tsis muaj ntau dhau deformation lossis tsis ua haujlwm. Kev xaiv cov qib boiler cov yeeb nkab uas tsim nyog yog vim li no qhov kev txiav txim siab tseem ceeb hauv engineering uas cuam tshuam ncaj qha rau kev nyab xeeb, kev ua haujlwm, thiab kev pabcuam lub neej.
Boiler yeeb nkab qib yog txhais los ntawm cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, thiab kev txwv qhov kub thiab txias. Lawv feem ntau tau teev tseg raws li cov qauv xws li ASTM, ASME, thiab EN cov lej, nrog rau txhua qib uas tsim los rau qhov tshwj xeeb siab - kub tswj. Kev nkag siab tias cov qib no txawv li cas pab cov engineers sib piv cov yam ntxwv ntawm cov khoom siv boiler tshwj xeeb.
Classification ntawm Boiler Pipe Qib
Carbon Steel Boiler Tubes
Cov qib carbon steel tau dav siv nyob rau hauv qis - mus rau nruab nrab - siab boilers qhov chaw ua hauj lwm kub yog nruab nrab. Cov hlau no feem ntau vam khom rau carbon thiab manganese rau lub zog. Ntawm qhov kub siab, cov pa roj carbon steel tswj cov khoom siv kho tshuab kom txaus mus txog rau qee qhov kev txwv, dhau qhov kev tawm tsam tsis txaus.
Cov qib carbon steel boiler raj muaj xws li ASTM A192 thiab ASTM A210. Cov ntaub ntawv no muaj cov thermal conductivity zoo thiab cov nqi ua haujlwm tab sis tsis haum rau ultra- daim ntawv thov kub.
Alloy Steel Boiler Tubes
Thaum boiler kev khiav hauj lwm kub tshaj qhov kev nyab xeeb ntawm cov hlau, hlau alloys uas muaj chromium thiab molybdenum yog ua hauj lwm. Cov ntsiab lus alloying no txhim kho siab - kub lub zog, oxidation tsis kam, thiab creep kuj. Qib xws li ASTM A213 T11, T22, thiab T91 yog muaj nyob rau hauv siab -siab thiab supercritical boiler systems.
Chromium txhim kho oxidation tsis kam los ntawm kev tsim cov txheej txheem oxide tiv thaiv, thaum molybdenum txhim kho lub zog creep nyob rau hauv ntev raug tshav kub. Qhov sib ntxiv ntawm vanadium los yog niobium nyob rau hauv cov qib siab ntxiv refines microstructure thiab nce siab - kub stability.
Cov lus hauv qab no piv cov neeg sawv cev carbon thiab alloy steel boiler yeeb nkab qib.
| Qib | Hom khoom | Hom Kev Ua Haujlwm Kub Ua Haujlwm | Ntsiab Alloying Elements | Daim ntawv thov |
|---|---|---|---|---|
| ASTM A192 Cov Lus Qhia Tshwj Xeeb | Carbon Steel | Mus txog ~ 450 degree | C, Mn | Tsawg-siab boilers |
| ASTM A 210 Cov Lus Qhia | Carbon Steel | Txog li ~ 500 degree | C, Mn | Nruab nrab-siab boilers |
| ASTM A213 T11 | Hlau alloy | Txog li ~ 540 degree | Cr, Mo | High-siab boilers |
| ASTM A213 T22 | Hlau alloy | Mus txog ~ 580 degree | Cr, Mo | Superheater tubes |
| ASTM A213 T91 | Advanced Alloy Steel | Txog li ~ 600℃+ | Cr, Mo, V, Nb | Supercritical boilers |
Qhov kev faib tawm no qhia txog kev nce qib ntawm qhov muaj peev xwm ntawm qhov kub thiab txias los ntawm kev sib ntxiv alloy.
Mechanical thiab Thermal Performance Requirements
Lub zog ntawm qhov kub siab
Cov kav dej boiler yuav tsum muaj lub zog txaus tensile thiab tawm lub zog ntawm kev ua haujlwm kub, tsis yog nyob rau hauv chav tsev kub xwb. Thaum kub nce, steel feem ntau poob lub zog. Alloy steels yog engineered los txo lub zog degradation.
Cov kws tsim qauv tsim kev cia siab rau cov txiaj ntsig kev ntxhov siab uas tau teev tseg hauv cov lej ntawm cov hlab ntsha siab. Cov txiaj ntsig no suav nrog cov txiaj ntsig kev nyab xeeb raws li cov ntaub ntawv ua haujlwm ntev -. Xaiv ib qib tsis txaus yuav ua rau deformation, rupture, los yog txo efficiency.
Creep Resistance
Creep yog hais txog lub sij hawm- nyob ntawm cov yas deformation nyob rau hauv tas li load ntawm qhov kub thiab txias. Hauv kev siv boiler, kev tawm tsam yog feem ntau tseem ceeb dua li luv luv - lub sij hawm tensile zog. Tshaj li ntau txhiab lub sijhawm ua haujlwm, lub zog tsis txaus tuaj yeem ua rau thinning, bulging, lossis kev puas tsuaj loj.
Alloy steels xws li T22 thiab T91 tshwj xeeb yog tsim los tiv thaiv creep los ntawm ruaj khov carbide tsim thiab refined grain qauv.
Oxidation thiab Corrosion Resistance
High -kub qhov kub thiab txias combustion gases txhawb oxidation. Chromium- muaj cov hlau alloy tsim kev tiv thaiv oxide nplai uas ua rau oxidation qeeb ntxiv. Hauv cov xwm txheej hnyav, cov ntsiab lus chromium ntau dua txhim kho cov kav ntev.
Cov lus hauv qab no qhia txog cov yam ntxwv ntawm kev ua tau zoo nrog rau cov kev xav tau ntawm kev ua haujlwm.
| Performance Factor | Carbon Steel Qib | Alloy Steel Qib | Engineering Impact |
|---|---|---|---|
| Siab -Tsub Muaj Zog | Nruab nrab | Siab | Txiav txim siab muaj peev xwm |
| Creep Resistance | Txwv tsis pub | Zoo heev (hauv qib siab) | Tswj lub sij hawm ntev - deformation |
| Oxidation Resistance | Nruab nrab | Txhim kho nrog chromium | Extens lub neej kev pab |
| Weldability | Zoo | Cov txheej txheem tswj tau ntau dua | Muaj feem xyuam rau kev tsim khoom |
| Nqi | qis | Siab dua | Influences project pob nyiaj siv |
Qhov kev sib piv no qhia txog kev ua lag luam - tawm ntawm kev ua tau zoo thiab kev xav txog nyiaj txiag.
Kev kho cua sov thiab Microstructure
Kev kho cua sov ua lub luag haujlwm tseem ceeb hauv kev ua tiav cov khoom xav tau. Cov pa roj carbon steel boiler raj feem ntau normalized los kho cov qauv nplej thiab txhim kho kev sib luag. Alloy steels feem ntau undergo normalizing thiab tempering los tsim tempered martensitic los yog bainitic microstructures uas txhim khu creep kuj thiab toughness.
Kev tswj qhov kub thiab txias thaum lub sijhawm kho cua sov yog qhov tseem ceeb. Tempering tsis raug tuaj yeem txo qis zog los yog nce brittleness. Hauv cov qib siab zoo li T91, tom qab-weld kho cua sov yog qhov yuav tsum tau ua kom muaj kev ruaj ntseg microstructural tom qab fabrication.
Daim ntawv thov -Kev txiav txim siab tshwj xeeb
Boiler systems muaj xws li kev lag luam, phab ntsa dej, superheaters, thiab reheaters, txhua qhov raug rau cov cheeb tsam sib txawv. Tsawg- qhov kub thiab txias tuaj yeem siv cov qib carbon steel rau kev siv nyiaj. High -kub superheater tubes yuav tsum tau hlau alloys muaj peev xwm tiv taus lub thermal kev nyuab siab ntev.
Supercritical thiab ultra-supercritical fais fab nroj tsuag ua haujlwm ntawm txawm tias siab dua thiab kub, xav tau qib siab alloy nrog kev ua haujlwm zoo dua. Kev xaiv cov khoom siv yuav tsum suav rau cov sijhawm ua haujlwm xav tau, hom roj, thiab lub sijhawm saib xyuas.
Ntsuas kev ua tau zoo thiab tus nqi siv lub neej
Txawm hais tias alloy steels muab kev ua haujlwm siab tshaj - kub, lawv koom nrog cov khoom siv ntau dua thiab cov nqi tsim khoom. Engineers yuav tsum xav txog tus nqi ntawm lub neej tsis yog thawj tus nqi yuav khoom ib leeg. Kev siv qib siab dua -qib alloy nyob rau hauv qhov tseem ceeb siab- qhov kub thiab txias tuaj yeem tiv thaiv kev ua tsis tiav ntxov thiab txo qis qis qis.
Kev saib xyuas, suav nrog kev tshuaj xyuas tsis tu ncua thiab saib xyuas cov raj tuab, pab kom muaj kev nyab xeeb ntev - lub sijhawm ua haujlwm tsis hais xaiv qib twg.
Xaus
Boiler yeeb nkab qib yog txhais los ntawm lawv lub peev xwm tiv taus siab, siab kub, creep deformation, thiab oxidation. Cov qib carbon steel xws li ASTM A192 thiab A210 ua haujlwm tau zoo hauv qis- thiab nruab nrab- siab boilers, thaum alloy steels xws li T11, T22, thiab T91 muab kev txhawb zog thiab nkag siab rau siab -kub thiab supercritical systems. Qhov sib ntxiv ntawm chromium thiab molybdenum ua rau muaj kev txhim kho siab -kub stability thiab oxidation kuj. Kev ua tau zoo ntawm boiler tsim nyob ntawm kev xaiv cov qib uas sib npaug ntawm kev ua haujlwm, thermal endurance, fabrication yuav tsum, thiab economic efficiency. Los ntawm kev xaiv cov khoom tsim nyog thiab kev kho cua sov, cov kav dej boiler ua tiav qhov kev ntseeg tau tsim nyog rau kev nyab xeeb thiab ruaj khov kev lag luam hluav taws xob.
