Kev tsim kho tshiab ntawm cov hlau rau siab Vessels

Kev tsim kho tshiab ntawm cov hlau rau siab Vessels

Rau cov khoom kub kub ntawm boiler superheaters thiab reheaters, qhov kev khiav hauj lwm kub yog 560-650 degree nyob rau hauv supercritical thiab ultra supercritical chav tsis. Hauv qhov ntsuas kub qis, 9-12% Cr steel feem ntau yog siv. Los ntawm qhov kev xav ntawm qhov kub thiab txias, nws yog qhov zoo tshaj los xaiv 12% Cr steel. Thaum kub siab tshaj 600 degree, austenitic chromium nickel siab alloy kub resistant steel yuav tsum tau siv. Raws li kev tshawb fawb tsis ntev los no, txhawm rau kom ntseeg tau tias qhov kub thiab txias txaus tiv thaiv corrosion thiab oxidation tsis kam rau high-temperature superheater thiab reheater yeeb nkab fittings, austenitic steel nrog cov ntsiab lus chromium ntau dua 20% yuav tsum tau xaiv, xws li 25Cr-20 NiNbN (HR3C), 23Cr-18NiCuWNbN (SAVE25), 22Cr-15NiNbN (Tempaloy A-3), thiab 20Cr-25NiMoNbTi (NF709).

Ntawm qhov tsis sib xws ntawm qhov siab (375 bar / 700 degree), nyob rau hauv qhov hluav taws xob ntawm lub tshuab hluav taws xob, vim tsis muaj zog txaus ntawm cov hlau austenitic, nws tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua, thiab cov nickel raws li alloys xws li Alloy617 yuav tsum tau siv.

Piv nrog rau cov tsoos austenitic tshav kub-resistant steel, niaj hnub austenitic tshav kub-resistant steel muaj cov yam ntxwv zoo tshaj plaws uas muaj ntau yam carbide ntxiv dag zog rau cov ntsiab lus, uas zoo heev txhim kho cov creep lub zog ntawm cov hlau.

Rau cov phab ntsa tuab xws li lub qhov hluav taws xob siab qhov hluav taws xob header thiab cov kav dej tseem ceeb ntawm cov chav boiler supercritical, txhim kho 9-12% Cr martensitic chromium steel feem ntau yog siv.

Cov qauv kev loj hlob ntawm 9-12% martensitic chromium hlau yog zoo ib yam li austenitic tshav kub-resistant steel, uas evolved los ntawm feem ntau Cr Mo binary alloy mus rau ib tug multi-component alloy. Nws lub hom phiaj tseem ceeb yog txhawm rau txhim kho qhov kub-kub creep lub zog ntawm cov hlau kom ntau li ntau tau, txo cov phab ntsa tuab ntawm cov phab ntsa tuab, ua kom yooj yim rau kev tsim khoom thiab txo cov nqi tsim khoom. Cov qib steel tau hais los saum toj no tau txhim kho lawv cov weldability zoo vim yog kev tswj nruj ntawm cov pa roj carbon, sulfur, thiab phosphorus cov ntsiab lus. Supercritical thiab supercritical boilers tau maj mam nce thiab siv txawv teb chaws, tau txais txiaj ntsig nyiaj txiag ntau.

Kev tsim kho tshiab ntawm cov hlau rau siab Vessels

Nyob rau hauv xyoo tas los no, txoj kev loj hlob ntawm cov hlau rau cov hlab ntsha siab tau txawv ntawm qhov ntawd rau cov boilers. Nws lub hom phiaj tseem ceeb yog txhawm rau txhim kho cov purity ntawm cov hlau, uas yog, siv ntau yam kev siv thev naus laus zis los txo cov ntsiab lus tsis zoo xws li sulfur, phosphorus, oxygen, hydrogen, thiab nitrogen hauv cov hlau. Kev tsim kho tshiab ntawm cov thev naus laus zis thev naus laus zis no tsis yog tsuas yog txhim kho qhov cuam tshuam ntawm cov hlau, tshwj xeeb tshaj yog kub-kub cuam tshuam toughness, strain aging kuj, temper brittleness, neutron amplitude embrittlement resistance, thiab corrosion resistance, tab sis kuj zoo heev txhim kho nws cov kev ua tau zoo, suav nrog weldability thiab kub ua haujlwm kev ua haujlwm.

Sib piv cov tshuaj muaj pes tsawg leeg, qhov cuam tshuam rau qhov hnyav ntawm qhov sib txawv ntawm qhov kub thiab txias, thiab cuam tshuam rau qhov hnyav tom qab kev laus ntawm 16MnR steel daim hlau dov siv cov qauv thiab niaj hnub smelting txoj kev, cov ntaub ntawv qhia tau hais tias ultra-tsawg sulfur, phosphorus, thiab nitrogen cov ntsiab lus tseem ceeb txhim kho qhov qis- Kub cuam tshuam toughness thiab strain aging kuj ntawm zoo tib yam uas tsis muaj alloy steel.

High purity purification kuj plays lub luag hauj lwm zoo heev nyob rau hauv lub notch cuam tshuam toughness ntawm 9% Ni steel ntawm qhov kawg ua hauj lwm kub (-196 degree) rau sib sib zog nqus-kub siv, raws li American ASTM A353 thiab A553 (9% Ni) steel qauv

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