Hastelloy Alloys hauv khib nyiab Incineration: Corrosion Resistance rau Acid Flue Gas Condensates

Kev hlawv cov khib nyiab hauv nroog ua rau ntau tshaj li cua sov thiab tshauv - nws tsim cov pa roj flue nrog hydrochloric acid, sulfur oxides, thiab lwm cov kua qaub- tsim cov tebchaw uas, ib zaug condensed, tsim ib qho ntawm cov kua qaub tshaj plaws nyob ib puag ncig txhua yam khoom siv niaj hnub ntsib. Standard stainless hlau, thiab nyob rau hauv ntau rooj plaub txawm 6% molybdenum super- qib austenitic, tsis txaus ntseeg txaus nyob rau hauv no tshwj xeeb condensate chemistry, uas yog vim li cas.Hastelloy C276, C-22, thiab C-2000 tau dhau los ua cov ntaub ntawv txheem thoob cov khib nyiab-rau-zog nroj tsuag scrubber thiab quench systems. Phau ntawv qhia no piav qhia tias yog vim li cas flue gas condensate thiaj li txhoj puab heev, qhov twg nyob rau hauv ib tug incineration tsob nroj nws tsim, thiab yuav ua li cas Hastelloy tsev neeg ntawm alloys tau teev tseg kom ciaj sia.

Vim li cas Pov Tseg Incineration Flue Gas tsim ib qho kev ua phem rau ib puag ncig?

Cov khib nyiab incineration flue gas yog qhov hnyav vim yog hlawv cov khoom khib nyiab hauv nroog - uas feem ntau muaj PVC yas, cov khoom noj khib nyiab, thiab lwm yam tshuaj chlorine - thiab sulfur-cov ntaub ntawv coj los - tso tawm hydrochloric acid, sulfur oxides, thiab lwm cov kua qaub- ua pa roj carbon monoxide - ua cov pa roj carbon monoxide 5} rau hauv ib zaug uas tsis tshua muaj corrosive. siab -chloride kua.

Cov khib nyiab hauv nroog yog cov roj uas muaj peev xwm sib txawv heev, thiab qhov sib txawv yog qhov ua rau nws cov khoom siv hluav taws xob xav tau: PVC thiab lwm cov chlorinated plastics tso cov roj hydrogen chloride (HCl) thaum combustion, sulfur - muaj cov ntaub ntawv tso tawm sulfur oxides uas tuaj yeem tsim cov sulfuric thiab sulfurous acids ntxiv rau hauv cov dej khib nyiab thiab cov khoom siv hluav taws xob. ntxiv complexity rau lub resulting gas thiab qhov kawg condensate chemistry.

Tsis zoo li cov txheej txheem tshuaj zoo - tswj cov txheej txheem tshuaj nrog cov khoom noj uas paub zoo, zoo ib yam, cov nroj tsuag incineration lub flue gas muaj pes tsawg leeg hloov nrog cov muaj pes tsawg leeg ntawm cov khib nyiab raug hlawv rau ib hnub, uas txhais tau hais tias cov txheej txheem tiv thaiv corrosion yuav tsum tsim kom muaj kev sib xyaw ua ke ntawm cov xwm txheej tiag tiag es tsis yog ib qho, tshwj xeeb tshaj yog cov khoom siv hluav taws xob - cov qauv tsim lub tswv yim uas muaj peev xwm ua tau zoo tshaj - cov ntaub ntawv muaj txiaj ntsig zoo tshaj - cov ntaub ntawv muaj txiaj ntsig zoo heev cov.

Acid Dew Point Corrosion yog dab tsi, thiab Nws tshwm sim nyob qhov twg hauv qhov system Incineration?

Acid dew point corrosion tshwm sim thaum cov pa roj cua txias rau qhov kub ntawm qhov uas nws cov kua qaub - ua cov vapors condense rau hauv cov kua dej ncaj qha rau ntawm cov khoom siv, thiab nws yog qhov hnyav tshaj plaws ntawm qhov txias txias -kawg tshav kub hloov chaw, quench chambers, thiab ntub dej txhuam tshuab qhov twg qhov condensation no yog ib qho tsis tuaj yeem zam los yog txhob txwm tshaj tawm cov txheej txheem los ntawm kev ua kom pom tseeb.

Cov pa roj ua kua qaub yog cov kua qaub- tsim cov khoom sib txuas hauv vapor daim ntawv ntawm qhov kub thiab txias, thiab thaum cov pa cua txias - los ntawm cov khoom siv hluav taws xob rov qab los yog txhob txwm quench thiab txhuam cov txheej txheem - cov tebchaw no ncav cuag qhov kub thiab txias uas lawv condense tawm raws li cov kua qaub acidic ncaj qha rau ntawm qhov chaw txias tshaj plaws. Qhov no acid dew point tsis yog ib qho kev ntsuas kub; Nws nyob ntawm qhov sib xyaw tshwj xeeb ntawm cov kua qaub thiab cov dej noo tam sim no, tab sis cov txheej txheem hauv qab no zoo ib yam: txhua qhov chaw hlau uas poob hauv qab qhov pib no dhau los ua qhov chaw sib xyaw ua ke rau qhov uas tuaj yeem ua rau qis heev -pH, siab - chloride, thiab feem ntau hauv zos concentrated corrosive kua.

Qhov no yog qhov tseeb vim li cas qhov txias txias -kawg economizer thiab cua preheater nto, quench chambers, thiab ntub scrubber hlab - tag nrho cov tshwj xeeb tsim los kom txias flue gas thiab, nyob rau hauv scrubbers, txhob txwm hu rau nws nrog kua rau acid gas tshem tawm - yog cov cheeb tsam uas qhov no corrosion mechanism yog heev hnyav thiab consection khoom.

Puas yog Hastelloy Alloys feem ntau siv hauv Kev Pabcuam Pov Hwm, thiab lawv txawv li cas?

Hastelloy C-276, C-22, thiab C-2000 yog cov nickel-chromium-molybdenum alloys feem ntau tau teev tseg rau acidic flue gas condensate kev pab cuam, txhua tus muab ib qho kev cuam tshuam tab sis txawv corrosion kuj profile zoo li qhov sib txawv ntawm molybdenum, tungsten, thiab tooj liab cov ntsiab lus.

Kev sib piv ntawm peb feem ntau teev Hastelloy qib rau qhov kev pabcuam no:

Table 1. Kev sib piv ntawm cov qib Hastelloy uas tau teev tseg rau cov kev pabcuam khib nyiab incineration flue gas condensate. Kev xaiv qib yuav tsum yeej ib txwm muaj kev lees paub los ntawm qhov tshwj xeeb condensate chemistry xav tau ntawm qhov chaw cog qoob loo, qhov zoo tshaj plaws tau txais kev txhawb nqa los ntawm kev ntsuam xyuas corrosion los yog cov ntaub ntawv ua haujlwm hauv kev sib piv, tsis yog cov lus qhia dav dav ib leeg.

Tag nrho peb cov alloys sib koom tib yam npib tsib xee -chromium- molybdenum lub hauv paus ua lub luag haujlwm rau kev tawm tsam ob qho tib si cov kua qaub thiab cov tshuaj chloride-induced localized corrosion, tab sis txhua tus tau tsim los txuas ntxiv lossis rov ua kom qhov sib npaug ntawm qhov kev taw qhia tshwj xeeb - C-22's txhim kho oxidizing{{7}2} thiab 0'0{0} tooj liab-driven sulfuric acid tsis kam ob qho tib si sawv cev rau lub hom phiaj metallurgical cov lus teb rau cov qhov khoob tshwj xeeb uas tau pom nyob rau hauv kev ua haujlwm nrog cov txheej txheem ua ntej xws li C-276, echoing tib hom kev sib xyaw ua kom zoo dua tau tham hauv lwm cov lus qhia ntawm stainless hlau qib evolution.

Vim li cas Standard Stainless Steel feem ntau tsis txaus rau Acid Flue Gas Condensate?

Tus qauv austenitic stainless hlau, thiab feem ntau txawm tias 6% molybdenum super- qib austenitic, feem ntau tsis txaus rau qhov hnyav acidic flue gas condensate zones vim yog kev sib xyaw ntawm pH qis, siab chloride concentration, thiab oxidizing hom nyob rau hauv qhov tshwj xeeb condensate tshaj qhov kev ua haujlwm corrosion crude, tshwj xeeb tshaj yog cov kev txwv tsis pub muaj kev cuam tshuam. chloride kev nyuaj siab corrosion cracking.

Flue gas condensate ntawm nws qhov hnyav tshaj sib xyaw ua ke ntau yam corrosion- ua kom nrawm nrawm ib txhij: chloride concentration uas tuaj yeem nce siab zoo tshaj cov txheej txheem dej raws li evaporation concentrates cov condensate, pH qis txaus los sawv cev rau cov kua qaub tiag tiag es tsis yooj yim chloride raug, thiab oxidizing combustion los ntawm {{1}txoj kev chloride 2} lawv tuaj yeem tiv taus cov khoom lag luam txwv. Qhov kev sib xyaw ua ke no yog qhov hnyav dua li cov tshuaj chloride pitting thiab crevice corrosion scenarios sib tham hauv lwm cov kev qhia ntawm PREN thiab stainless hlau chloride txwv, uas yog vim li cas pov tseg - rau- cov nroj tsuag hluav taws xob tshwj xeeb ncav cuag npib tsib xee-raws li Hastelloy alloys nyob rau hauv cov cheeb tsam hnyav tshaj plaws es tsis txhob cia siab rau PREN cov qib siab tshaj 7, stainless hlau ua tau zoo tshaj plaws oxidizing chloride ib puag ncig xws li dej hiav txwv.

C-22 Txhim Kho C-276 li cas rau Oxidizing Acidic Chloride Cov Mob?

Hastelloy C-22 txhim kho ntawm C-276 qhov kev ua tau zoo tshwj xeeb hauv oxidizing acidic chloride tej yam kev mob los ntawm rebalanced chromium, molybdenum, thiab tungsten muaj pes tsawg leeg, muab nws zoo dua tiv thaiv rau hauv zos corrosion thiab kev tawm tsam dav dav nyob rau hauv lub xub ntiag ntawm oxidizing hom tshaj C-276 muaj, uas yog vim li cas C-22 tau dhau los ua ntau dua kev tsim qauv niaj hnub.

C-276 tseem yog ib qho zoo heev, muaj peev xwm muaj peev xwm alloy, tab sis kev paub dhau los ntawm kev ua tshuaj lom neeg thiab cov roj siv hluav taws xob tau pom tias nws qhov kev ua tau zoo tuaj yeem dhau los ua qhov tsis tshua muaj txiaj ntsig tshwj xeeb thaum acidic chloride tej yam kev mob kuj muaj zog oxidizing - kev sib xyaw ua ke tiag tiag hauv incineration flue gas condensate muab cov oxidizing {5} tam sim no los ntawm cov pa roj carbon dioxide. C-22 txoj kev txhim kho tshwj xeeb tau tsom rau qhov sib txawv no, rov ua kom cov hlau sib npaug ntawm chromium thiab molybdenum-tungsten piv kom txuas ntxiv txhim khu kev qha ntxiv rau hauv cov txheej txheem oxidizing yam tsis muaj kev txo qis cov kua qaub uas ua rau C-276 muaj txiaj ntsig hauv thawj qhov chaw.

Qhov kev txhim kho lub hom phiaj no yog vim li cas ntau niaj hnub ntub dej scrubber system tsim qhiaC22yam tsawg kawg nkaus sib npaug, thiab hauv oxidizing - mob - cov ntawv thov qee zaum nyiam tshaj, C-276, txawm tias ob qho tib si tseem siv tau, nquag teev cov kev xaiv nyob ntawm seb cov tshuaj condensate tshwj xeeb uas cov nroj tsuag xav tau.

C-2000's Copper Ntxiv Ua Si hauv Flue Gas Condensate Resistance yog dab tsi?

C-2000's tooj liab ntxiv tshwj xeeb txhim khu kev tiv thaiv rau sulfuric acid thiab qee cov kua qaub sib xyaw, ua rau nws muaj kev xaiv tshwj xeeb uas cov roj cua condensate nqa ib qho tseem ceeb sulfate lossis sulfuric acid tivthaiv nrog rau cov ntsiab lus chloride ntau dua.

Cov tooj liab ntxiv muaj qhov zoo -tsim lub luag haujlwm hauv nickel alloy metallurgy los txhim kho kev tiv thaiv hauv kev txo cov kua qaub ib puag ncig, ib txoj hauv kev kuj tau sib tham hauv lwm cov lus qhia uas hais txog tooj liab lub luag haujlwm hauv qib xws li 904L. C-2000 siv tib lub hauv paus ntsiab lus no nyob rau hauv siab -chromium, siab-molybdenum Hastelloy molybdenum, muab nws cov corrosion kuj profile uas spans ob oxidizing thiab txo tej yam kev mob thaum muab tshwj xeeb lub zog nyob rau hauv sulfuric-acid-influenced chemistry vim hais tias muaj feem xyuam rau cov gases - sulfur{14}}cov khoom khib nyiab tuaj yeem tsim cov ntsiab lus sulfate thiab sulfuric acid cov ntsiab lus nrog rau kev sib tham ntau dua hydrochloric acid pab. Qhov twg cov nroj tsuag tshwj xeeb xav tau condensate chemistry tsom xam qhia cov ntsiab lus tseem ceeb ntawm sulfate yog qhov kev txhawj xeeb, C-2000 yog ib qho khoom siv tsim nyog los ntsuas nrog C-276 thiab C-22 es tsis yog defaulting rau ob qho ntawm ntau cov tshuaj chloride-focused kev sib tham ib leeg.

Qhov twg hauv ib tsob nroj Incineration Yog Hastelloy Alloys Feem ntau Qhia?

Hastelloy alloys feem ntau yog teev nyob rau hauv cov ntaub ntub dej ntub dej, quench chambers, pos huab eliminators, thiab txias -kawg tshav kub hloov chaw - cov cheeb tsam tshwj xeeb uas muaj kev sib cuag ncaj qha nrog cov concentrated acidic condensate tshwm sim - thaum tsis tshua muaj cheeb tsam ntawm tib cov khoom siv nyiaj txiag ntau.

Ib cheeb tsam -los ntawm- cheeb tsam saib ntawm cov khoom siv ib txwm mus hla ib qho chaw incineration txoj kab hluav taws xob:

Table 2. Cov neeg sawv cev cheeb tsam-los ntawm- cheeb tsam corrosion hnyav thiab cov khoom mus kom ze ntawm cov khib nyiab- mus rau- lub zog hluav taws xob hluav taws xob hluav taws xob txoj hauv kev.

Cov qauv kev xaiv no tsom rau tib cheeb tsam -raws li, tsav tsheb- cov khoom siv tshwj xeeb xaiv lub tswv yim sib tham hauv lwm cov kev qhia ntawm cov qauv hauv ntug dej hiav txwv thiab cov khoom siv tshuaj ua haujlwm: es tsis yog tsim cov nroj tsuag tag nrho los ntawm corrosion feem ntau -cov khoom siv resistant, engineers concentrate premium npib tsib xee alloys tshwj xeeb ntawm cov chaw uas muaj kev ruaj ntseg, cov kua qaub ntau ntxiv rau cov khoom siv hluav taws xob los yog cov khoom siv hluav taws xob tiv thaiv extrusion. tib qhov system.

Yuav Ua Li Cas Cov Kws Ua Haujlwm Yuav Ua Li Cas Xaiv Cov Khoom Siv hla ib qho chaw cog qoob loo Corrosion Zones?

Cov kws ua haujlwm yuav tsum ua tus yam ntxwv xav tau condensate chemistry - chloride, sulfate, thiab pH - los ntawm cheeb tsam, daim ntawv qhia cov hlau hauv zos qhov kub thiab txias ntawm cov kua qaub dew point, thiab xaiv ntawm C-276, C-22, thiab C-2000 (los yog kev sib xyaw ua ke nyob rau ntau thaj chaw) raws li qhov tshwj xeeb oxidizing / txo tus cwj pwm thiab sulfate cov ntsiab lus ntawm txhua qhov chaw.

Ib txoj hauv kev xaiv cov tswv yim:

1. Characterize xav tau flue gas thiab condensate chemistry,suav nrog cov tshuaj chloride, sulfate, thiab pH ntau yam, zoo tshaj plaws raws li qhov tseeb lossis cov neeg sawv cev pov tseg cov dej muaj pes tsawg leeg es tsis yog cov kev xav.

2. Daim ntawv qhia qhov kub thiab txias hauv zos tiv thaiv cov kua qaub dew pointrau txhua cheeb tsam, txheeb xyuas qhov twg condensation yuav tshwm sim txawm tias nyob sab nraum cov chaw ntub dej xws li scrubbers thiab quench chambers.

3. Ntsuas cov oxidizing/txo tus cwj pwm ntawm qhov xav tau condensateRaws li qhov tseem ceeb hauv kev xaiv ntawm C-276 thiab C-22, ua raws li cov txheej txheem kev xaiv cov khoom siv uas tau hais los hauv lwm cov lus qhia txog kev oxidizing tiv thaiv kev tiv thaiv corrosion.

4. Xav txog C-2000 tshwj xeeb uas sulfate lossis sulfuric acid cov ntsiab lus yog ib qho tseem ceeb, cov ntaub ntawv pov thawjntawm qhov xav tau condensate chemistry, es tsis yog defaulting nkaus xwb rau chloride - tsom rau kev sib piv qib.

5. Thov hwm cov alloys xaiv los ntawm cheeb tsam,khaws cov qhab nia Hastelloy rau cov chaw uas muaj kev cuam tshuam, hnyav acid condensate raug thaum siv cov ntaub ntawv siv nyiaj ntau dua lossis cov ntaub thaiv tiv thaiv lwm qhov hauv tib tsob nroj.

Cov lus nug nquag

Puas yog duplex lossis super duplex stainless hlau siv tau nyob txhua qhov chaw hauv qhov chaw pov tseg incineration cog cov kua qaub?

Yog lawm, nyob rau hauv cov cheeb tsam uas tsis tshua muaj zog uas condensate chemistry tsis tshua muaj kev txhoj puab heev los yog hlau kub ntseeg siab nyob rau saum toj no acid dew point, duplex thiab super duplex qib muaj peev xwm muab ib tug ntau yig dua lwm txoj rau Hastelloy alloys, tab sis lawv feem ntau tsis pom zoo rau kev ncaj, sustained kev sib cuag nrog cov scrubber hnyav tshaj plaws thiab quench chamber condensate.

Puas yog cov dej khib nyiab muaj feem cuam tshuam rau qib Hastelloy uas tsim nyog?

Yog - txij li lub nroog cov khoom khib nyiab sib txawv raws thaj tsam thiab dhau sijhawm, cov nroj tsuag hlawv cov dej khib nyiab nrog cov ntsiab lus siab chlorinated yas, sulfur-cov khoom siv, lossis cov khoom khib nyiab co-firing tej zaum yuav pom muaj txiaj ntsig sib txawv condensate chemistry dua li cov khoom pov tseg hauv nroog ib txwm, uas yog vim li cas qhov chaw zoo tshaj li qhov kev pom zoo- kev xaiv siv universally hla txhua qhov chaw incineration.

Puas yog Hastelloy alloys siv los ua cov khoom siv hauv nkoj, lossis ntau dua li hauv ob sab phlu thiab cladding?

Ob txoj hauv kev yog siv hauv kev xyaum - Cov khoom siv Hastelloy yog ib qho khoom siv rau cov khoom me me thiab cov khoom tseem ceeb xws li kev tshem tawm cov huab cua, thaum cladding los yog hauv ob sab phlu kev lag luam ntau dua nrog cov txheej Hastelloy yog ib qho kev siv nyiaj ntau dua -txoj kev zoo rau cov nkoj loj, nrog rau kev xaiv nyob ntawm seb lub nkoj loj, kev xav txog kev tsim khoom, thiab kev lag luam.

Puas yog vuam Hastelloy alloys hauv incineration cog fabrication txawv ntawm vuam lawv nyob rau hauv lwm yam lag luam?

Lub hauv paus ntsiab lus vuam - tsim nyog muab tub lim hlau xaiv, kev tswj cov cua sov, thiab tom qab- vuam tu - yog zoo ib yam nrog Hastelloy vuam xyaum nyob rau hauv industries, txawm incineration cog fabrication yuav tsum tseem ua raws li ib tug tsim nyog welding txheej txheem rau qhov tseeb alloy thiab daim ntawv thov es tsis txhob assumes general nickel alloy welding apprehension.

Puas yog siv tus hwm Hastelloy alloy tshem tawm qhov kev xav tau ntawm kev tshuaj xyuas tsis tu ncua hauv incineration cog scrubber systems?

Tsis muaj - txawm tias corrosion heev- cov alloys tiv taus tau txais txiaj ntsig los ntawm cov ntaub ntawv tshuaj xyuas, tshwj xeeb tshaj yog muab qhov sib txawv ntawm qhov sib txawv ntawm cov roj hluav taws xob hluav taws xob hauv cov nroj tsuag lub neej ua haujlwm; Kev tshuaj xyuas tseem yog ib qho tseem ceeb ntxiv rau kev xaiv cov khoom es tsis yog ib kauj ruam uas qhov kev xaiv zoo tshaj plaws alloy ua rau tsis tsim nyog.