Vanadium-based SCR Catalyst

Vanadium-raws li catalyst yog ib qho tseem ceeb catalyst nyob rau hauv lub tshav pob ntawm diesel cav tso pa kev kho mob. Nws yog tsim los ntawm vanadium pentoxide (V₂O₅) raws li cov khoom xyaw nquag, thiab feem ntau ntxiv nrog lwm cov hlau oxides (xws li tungsten trioxideWO₃, titanium dioxideTiO₂, etc.) raws li additives thiab nqa. Qhov tshwm sim ntawm cov catalyst yog honeycomb, tiaj tus, thiab corrugated.

Lub hauv paus ntawm SCR vanadium-based catalyst yog vanadium pentoxide (V₂O₅), uas yog lub ntsiab active tivthaiv nyob rau hauv lub catalyst. Qhov saum npoo ntawmV₂O₅yog acidic, thiab nws yog ib qho yooj yim mus ntes alkaline ammonia (NH₃) ntawm qhov chaw catalyst rau cov tshuaj tiv thaiv. Nws qhov tshwj xeeb oxidation kom zoo dua yog qhov tsim nyog rau kev hloov ammonia thiabNOx(Nitrogen oxides) rau hauv nitrogen (N₂thiab dej (H₂O), uas yog tshwj xeeb tshaj yog haum rau tej thaj chaw uas muaj oxygen. Tsis tas li ntawd, cov catalyst siv cov khoom siv honeycomb ceramic ua cov nqa khoom thiab tungsten trioxide (WO₃) raws li additives.

Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm SCR vanadium-based catalyst yog ua raws li kev xaiv catalytic txo cov thev naus laus zis. Nyob rau hauv ib tug tej yam cua kub ntau (feem ntau yog 300 ~ 400 degree), urea aqueous tov (los yog lwm yam txo tus neeg sawv cev) yog sprayed rau hauv lub tso pa roj thiab decomposed los tsim ammonia (NH₃). Tom qab ntawd, ammonia reacts chemically nrogNOxnyob rau hauv cov pa tso pa nyob rau hauv qhov kev txiav txim ntawm lub catalyst kom tsim muaj teeb meem nitrogen (N₂thiab dej (H₂O), yog li no zoo txo ​​cov emission ntawmNOxhauv cov pa tawm.

Adsorption theem: Ua ntej, ammonia (NH₃) yog adsorbed ntawm qhov chaw nquag ntawm cov catalyst raws li tus neeg sawv cev txo qis. Cov chaw nquag no feem ntau yog Lewis acid chaw thiab Brønsted acid chaw tsim los ntawm vanadium oxides.

Reaction theem: Tom qab, nitrogen oxide (NOx) molecules adsorbed ntawm lub catalyst nto cuam tshuam nrog ammonia molecules. Nyob rau hauv qhov kev txiav txim ntawm lub catalyst,NOxyog txo kom nitrogen (N₂) thiab ammonia yog oxidized. Cov txheej txheem no feem ntau yog nrog los ntawm kev hloov pauv ntawm vanadium oxide ntawm oxidized thiab txo lub xeev.

Desorption theem: Thaum kawg, cov nitrogen tsim yog desorbed los ntawm lub catalyst nto thiab tso rau hauv lub flue gas, thaum lub generated dej nyob rau hauv lub catalyst nto los yog nplooj nyob rau hauv daim ntawv ntawm dej vapor.

Kev ua haujlwm siab thiab kev xaiv ntawm vanadium-based catalysts raug ntaus nqi rau cov qauv hluav taws xob tshwj xeeb thiab kev ua haujlwm catalytic ntawm vanadium oxides. Lub catalyst yog tsim los ua kom zoo dua qhov kev faib tawm thiab lub zog ntawm cov chaw nquag no los txhawb SCR cov tshuaj tiv thaiv thaum tiv thaiv qhov tshwm sim ntawm kev tawm tsam sab nraud. Kev khiav hauj lwm kub ntawm vanadium-raws li catalysts feem ntau yog nyob nruab nrab ntawm 310 thiab 430 degrees Celsius, uas yog ib tug nruab nrab-siab kub catalyst. Qhov no sib haum mus rau qhov kub thiab txias ntawm lub qhov hluav taws xob ntawm boiler economizer, tso cai rau SCR denitrification reactor ncaj qha rau hauv cheeb tsam no kom ua tau zoo denitrification.

Ib txwmV₂O₅/WO₃/TiO₂SCR catalyst, nruab nrab-kub catalyst, sulfur-resistant,V₂O₅yog tshuaj lom, muaj qhov kub kub kub, lub qhov rais nqaim kub, tsis zoo rau qhov kub thiab txias, thiab muaj kev pheej hmoo ntawm kev ua qias tuaj ib puag ncig tom qab scrapping.

Txhim kho vanadium-based SCR: Ib qho kev txhim kho ntawm cov tsoos V-raws li, tsis muaj toxicity, sulfur-resistant, thiab siab hloov efficiency ntawm nruab nrab kub.

Kev hloov pauv siab: SCR vanadium-based catalysts qhia siabNOxconversion efficiency nyob rau hauv nruab nrab kub tej yam kev mob (xws li 350 ~ 450 degree), uas muaj peev xwm ncav cuag ntau tshaj 90%.

Zoo sulfur tsis kam: Vanadium-based catalysts muaj kev ua siab ntev rau cov sulfur thiab tuaj yeem tswj cov kev ua haujlwm catalytic zoo hauv cov pa hluav taws xob nrog cov ntsiab lus sulfur siab.

Tsawg toxicity: Piv nrog rau lwm hom catalysts, vanadium-based catalysts muaj toxicity tsawg dua thiab cuam tshuam rau ib puag ncig thiab tib neeg kev noj qab haus huv.

Kev ruaj ntseg ruaj khov: Raws li kev ua haujlwm tsim nyog, SCR vanadium-based catalysts tuaj yeem tswj xyuas cov catalytic ruaj khov rau lub sijhawm ntev.

SCR vanadium-based catalysts tau siv dav hauv cov tshuab hluav taws xob diesel tso tawm tom qab kev kho mob, tshwj xeeb tshaj yog cov tsheb hnyav hnyav nrog cov qauv siv hluav taws xob siab thiab cov tshuab tsis siv neeg. Tsis tas li ntawd, SCR vanadium-based catalysts tau dav siv hauv thermal fais fab nroj tsuag, khib nyiab incineration nroj tsuag, nitric acid nroj tsuag, nitrate nroj tsuag, steel nroj tsuag, chiv thiab lwm yam lag luam.

Cim npe nrov: Vanadium-raws li scr catalyst, Tuam Tshoj vanadium-based scr catalyst manufacturers, lwm tus neeg, Hoobkas