Corrosion yog qhov tseem ceeb ntawm kev tsis ua haujlwm hauv cov khoom siv hluav taws xob

Corrosion yog qhov tseem ceeb ntawm kev tsis ua haujlwm hauv cov khoom siv hluav taws xob

Corrosion yog qhov tseem ceeb ntawm kev tsis ua haujlwm hauv cov khoom siv hluav taws xob. Qhov chaw corrosion feem ntau yog cov yeeb nkab, thiab cov ntaub ntawv tseem ceeb ntawm corrosion muaj xws li: acidity thiab alkalinity ntawm nruab nrab nws tus kheej ntawm lub plhaub sab yog corrosive, muaj tensile kev nyuaj siab ntawm lub plhaub los yog yeeb nkab, thiab muaj qhov sib txawv ntawm cov yeeb nkab thiab lub raj phaj, uas tuaj yeem ua kom nrawm dua corrosion thiab ua rau kub exchanger tsis ua hauj lwm.

2.1 Nruab nrab corrosion

Cov kua dej yog qhov nruab nrab corrosive, thiab kev sib cais ntawm qee qhov concentrations ntawm nitrogen, oxygen, hydrogen, sulfur, thiab lwm yam nyob rau hauv nruab nrab feem ntau ua rau tsis ua hauj lwm ntawm lub tshav kub exchanger. Kev daws: Tsim nyog xaiv cov ntaub ntawv uas haum rau nruab nrab, thiab siv cov kev tiv thaiv zoo sib xws rau cov ions sib txawv xws li nitrogen, oxygen, hydrogen, thiab sulfur. Piv txwv li, cov khib nyiab kub boiler siv los rov qab cua sov los ntawm nitric acid tail gas muaj nitrogen thiab ammonia gas. Ntawm qhov kub thiab txias, nitrogen tuaj yeem tsim cov tawv thiab nkig nitrides nrog hlau thiab ntau lwm yam hlau, ua rau nitridation ntawm hlau thiab deteriorating nws cov khoom siv kho tshuab. Tshwj xeeb tshaj yog nyob rau hauv lub inlet ntawm high-temperature gas, nruab nrab corrosion ua rau saum npoo ntawm lub raj phaj, kev twb kev txuas welds ntawm lub raj phaj thiab lub raj, nrog rau qhov kawg ntawm lub tshav kub exchange tub raj nyob ze ntawm lub nto ntawm lub raj phaj, leak thiab tsis tuaj yeem welded, uas ua rau tag nrho cov khoom raug muab pov tseg.

2.2 Kev ntxhov siab corrosion

Residual stresses nyob rau hauv cov ntaub ntawv uas tshwm sim los ntawm welding, kub ua, thiab kev kho cua sov ntawm tshav kub exchangers, sib dhos kev ntxhov siab thaum lub sij hawm installation, mechanical thiab thermal stresses tshwm sim los ntawm lub siab thiab kub sib txawv nyob rau hauv thiab sab nraum cov kav dej thaum lub sij hawm ua hauj lwm, raws li zoo raws li ntxiv kev nyuaj siab los ntawm loads, kev ua haujlwm, lossis kev vibrations, tuaj yeem tsim kev ntxhov siab tensile. Kev ntsuas cov lus teb tseem ceeb yog txhawm rau tshem tawm cov kev ntxhov siab tensile, piv txwv li, kev ntxhov siab tuaj yeem raug tshem tawm los ntawm txoj kev xws li kev kho cua sov.

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