Boiler steel yeeb nkab tawg yog ib qho kev ua tsis tiav loj tshaj plaws hauv thermal fais fab nroj tsuag thiab kev lag luam chav. Tsis zoo li cov pa me me, qhov tawg tuaj yeem cuam tshuam sai ntawm cov ciam teb siab, feem ntau nrog cov pa tawm tam sim ntawd, kev cuam tshuam ntau lawm, thiab muaj peev xwm muaj kev phom sij. Boiler hlab ua haujlwm nyob rau hauv qhov kub thiab txias, siab siab, thiab corrosive tej yam kev mob rau ncua sij hawm, uas ua rau lawv yooj yim mus ua ke txhua yam thiab metallurgical degradation. Nkag siab txog ntau lub hauv paus ua rau tom qab cov yeeb nkab tawg yog qhov tseem ceeb rau kev txhim kho kev ntseeg tau thiab txuas ntxiv lub neej kev pab cuam.
Thermal thiab Mechanical Overstress Factors
1. Ntev-Lub Sij Hawm Tshaj Tawm
Thaum cov hlau kub tshaj qhov tsim txwv rau lub sij hawm ntev, lub microstructure ntawm carbon steel los yog hlau alloy pib degrade. Grain coarsening thiab creep void tsim txo tensile lub zog, nws thiaj li ua rau rupture. Ntev- lub sij hawm overheating feem ntau tshwm sim nyob rau hauv lub superheater raj vim tsis muaj pa txaus los yog fouling ntawm tshav kub hloov chaw. Kev tiv thaiv yuav tsum tau saib xyuas qhov ntsuas kub kom raug, tsim kom muaj lub voj voog kom zoo, thiab kev tu kom huv si kom tswj tau cov cua sov kom zoo.
2. Short-Lub Sijhawm Kub Kub
luv-lub sij hawm overheating yog sai sai thiab feem ntau tshwm sim los ntawm cov nplaim taws los yog hloov pauv ceev. Cov yeeb nkab phab ntsa kub nce sai tshaj qhov tso cai rau kev ntxhov siab, ua rau cov yas deformation tam sim ntawd thiab tawg. Burner alignment soj ntsuam thiab combustion tswj optimization yog cov kev tiv thaiv tseem ceeb.
3. Kev kub siab sab hauv
Thaum kev khiav hauj lwm siab tshaj qhov tso cai kev nyuab siab xam raws li cov qauv tsim, hoop kev ntxhov siab nyob rau hauv cov yeeb nkab phab ntsa nce proportionally. Kev ruaj ntseg valve malfunction los yog tswj system tsis ua hauj lwm yuav ua tau tej yam kev mob. Cov kev ntsuas niaj hnub ntawm cov cuab yeej siv siab nyem thiab cov cuab yeej txhim khu kev qha tiv thaiv cov xwm txheej txaus ntshai.
4. Thermal Fatigue
Nquag pib thiab kaw lub voj voog ua rau muaj kev ntxhov siab cyclic thermal. Rov qab nthuav dav thiab contraction tsim tawg pib ntawm weld seams thiab khoov. Kev tswj kev nce qib- cov txheej txheem nce thiab txhim kho kev sib koom ua ke kom txo tau cov thermal qaug zog puas tsuaj.
5. Mechanical Vibration
Siab -ntaub nrawm los yog qhov sib txuas tsis raug tuaj yeem ua rau muaj kev vibration- ua rau qaug zog. Resonance tej yam kev mob ua kom muaj kev ntxhov siab ntau ntawm cov ntsiab lus txhawb nqa. Txhim kho kev co dampers thiab optimizing kev txhawb nqa layout zoo txo qhov kev pheej hmoo.
Cov lus hauv qab no qhia txog cov ntsiab lus tseem ceeb ntawm cov neeg kho tshuab thiab thermal ua rau boiler yeeb nkab tawg.
| Ua rau qeb | Mechanism | Kev Tiv Thaiv Kev Ntsuas |
|---|---|---|
| Ntev -Lub Sij Hawm Kub Kub | Creep kev puas tsuaj ntawm qhov kub thiab txias | Kev ntsuas kub tsis tu ncua ntawm hlau |
| Luv -Lub Sijhawm Kub Kub | Kev kub ceev ceev | combustion optimization |
| Tshaj siab | Kev ntxhov siab ntau dhau | Tsis tu ncua kev nyab xeeb valve tshuaj xyuas |
| Thermal Fatigue | Cyclic expansion stress | Tswj cov txheej txheem pib |
| Mechanical Vibration | Resonance-ua rau qaug zog | Tsim nyog kev txhawb nqa |
Corrosion thiab Metallurgical Degradation
6. Oxygen Corrosion
Dissolved oxygen nyob rau hauv feedwater reacts nrog hlau, tsim pits uas nkag mus rau hauv cov yeeb nkab phab ntsa. Nyob rau tib lub sij hawm, localized thinning ua rau rupture. Cov txheej txheem deaeration zoo thiab cov pa oxygen scavengers yog qhov tseem ceeb tiv thaiv kev daws teeb meem.
7. Caustic Corrosion
Cov kab mob alkalinity siab ua rau caustic gouging, tshwj xeeb tshaj yog nyob rau hauv siab - cheeb tsam kev ntxhov siab. Kev tswj dej chemistry thiab tswj pH zoo ib yam tiv thaiv kev tawm tsam alkaline.
8. Hydrogen puas
Nyob rau hauv tej yam kev mob, hydrogen atoms diffuse rau hlau, ua rau sab hauv tawg thiab embrittlement. Kev tswj kom zoo ntawm acidic tej yam kev mob thiab hydrogen- tsim cov tshuaj tiv thaiv txo qhov kev pheej hmoo no.
9. Sulfide Corrosion
Roj impurities yuav qhia cov sulfur tebchaw uas hnov mob ntawm qhov kub thiab txias, ua kom cov phab ntsa thinning. Kev tswj hwm roj zoo thiab kev kho cov roj flue txo cov sulfur- cuam tshuam txog kev puas tsuaj.
10. Corrosion Nyob rau hauv Deposits
Scale thiab sludge deposits tsim lub zos overheating thiab txawv aeration hlwb. Cov txheej txheem tshuaj ntxuav thiab tshuab tshuab tsis tu ncua pab tswj kom huv si sab hauv.
11. Sab nraud Corrosion
Cov dej noo nyob rau hauv rwb thaiv tsev ua rau corrosion nyob rau hauv rwb thaiv tsev, maj mam tsis muaj zog cov yeeb nkab los ntawm sab nraud. Cov kev tshuaj ntsuam xyuas thiab cov txheej txheem tiv thaiv yog kev tiv thaiv zoo.
Khoom thiab Fabrication Teeb meem
12. Cov khoom siv tsis raug
Inclusions, laminations, los yog tsis tsim nyog alloy muaj pes tsawg leeg txo cov yam ntxwv lub zog. Daim ntawv pov thawj cov ntaub ntawv nruj thiab kev tshuaj xyuas tuaj tiv thaiv cov khoom siv tsis zoo los ntawm kev nkag mus rau kev pabcuam.
13. Weld Defects
Kev nkag mus tsis tiav, porosity, lossis slag suav nrog tsim kom muaj kev ntxhov siab. Nyob rau hauv lub siab, cov kab nrib pleb propagate los ntawm cov flaws. Tsis yog -kev kuaj kev puas tsuaj thiab cov txheej txheem vuam tsim nyog yog qhov yuav tsum tau ua kom ntseeg tau tias muaj kev ncaj ncees.
14. Kev kho cua sov tsis raug
Kev kho cua sov tsis raug tuaj yeem ua rau qhov tsis sib xws ntawm cov tawv nqaij los yog kev ntxhov siab. Cov metallurgical inconsistencies txo creep zog thiab qaug zog kuj. Kev ua raws li cov txheej txheem kev kho cua sov thiab kev sim hardness tiv thaiv kev ua tsis tiav ntxov.
Lub rooj thib ob qhia txog kev xeb thiab cov khoom siv - cuam tshuam qhov tawg ua rau.
| Ua rau qeb | Technical Effect | Kev tiv thaiv zoo |
|---|---|---|
| Oxygen Corrosion | Pitting thiab phab ntsa nkag | Deaeration thiab oxygen scavengers |
| Caustic Attack | Localized hlau poob | Kev tswj dej chemistry |
| Hydrogen puas | Embrittlement thiab cracking | Kev tswj cov kua qaub |
| Sulfide Corrosion | Siab -kub thinning | Kev tswj hwm roj zoo |
| Khoom siv / Weld Defects | Kev nyuaj siab concentration | NDT tshuaj xyuas thiab kev ruaj ntseg zoo |
Integrated Prevention Strategy
Tiv thaiv boiler steel yeeb nkab tawg yuav tsum muaj kev paub txog engineering mus kom ze es tsis yog cais tawm kev kho. Kev tsim qauv yuav tsum xav txog qhov kub thiab txias, kev ntsuas kev ntxhov siab, thiab cov khoom nkag siab. Kev ua haujlwm yuav tsum ua raws li kev tswj xyuas ruaj khov, kev tswj xyuas dej kom zoo, thiab tiag - lub sijhawm saib xyuas qhov kub thiab txias. Cov kev zov me nyuam yuav tsum suav nrog kev ntsuas ntsuas lub sijhawm ntsuas ntsuas ntsuas ntsuas ntsuas, ntsuas hluav taws xob ntsuas hluav taws xob, thiab ntsuas kev ntsuas metallurgical thaum kuaj pom qhov txawv txav.
Cov nroj tsuag niaj hnub no vam khom rau cov kev kwv yees kev saib xyuas digital uas taug qab kev ua haujlwm tsis tu ncua. Kev tshawb pom ntxov ntawm kev sib txawv ntawm qhov sib txawv tso cai rau kev kho kom zoo ua ntej kev tawg tshwm sim. Los ntawm kev hais txog kev ntxhov siab, kev txhim kho corrosion, thiab kev ncaj ncees ntawm cov khoom ib txhij, cov neeg ua haujlwm boiler tuaj yeem txo qhov xwm txheej tawg, txhim kho kev nyab xeeb, thiab txuas ntxiv lub neej kev pab cuam ntawm cov kav hlau tseem ceeb.
