Nrog rau kev txhim kho txuas ntxiv ntawm kev tiv thaiv ib puag ncig, cov kev xav tau ntawm NOX emission ntawm cov tuam txhab tsim cov cement tseem nce ntxiv.Txij li lub Peb Hlis 2014, NOX emission xav tau ntawm cov tuam txhab cement tshiab yog tsawg dua 400mg / m3, thiab NOX emission concentration hauv thaj chaw tseem ceeb yog qis dua 300mg/m3.NOX tswj technologies feem ntau siv nyob rau tam sim no muaj xws li: optimizing lub combustion system ntawm lub kiln thiab decomposition rauv, hloov lub luag hauj lwm scheme thiab sib tov cov mineralizing tus neeg saib xyuas, txo qhov kub thiab txias lub sij hawm ntawm lub clinker burning, txhim kho cov flammability. , txais yuav qhov qis NOX burner, thiab siv cov fractional combustion technology nyob rau hauv lub kiln tail preheater thiab pipeline.Tab sis lawv tsis txo ib puag ncig yuav tsum.Tam sim no, cement qhauj feem ntau txais yuav "tsawg nitrogen denitrification".Non-catalytic txo ntawm "SNCR" Cov txheej txheem denitrification tswj nitrogen oxide emissions.Cov txheej txheem denitrification ntawm SNCR yog tsuas yog txau cov dej ammonia nyob rau hauv lub preheater los yog decomposition rauv, uas yog txo kom nitrogen los ntawm cov tshuaj tiv thaiv nrog nitrogen oxide.
"SCR flue gas denitrifying txo tus neeg sawv cev gasification / kev sib xyaw ua ke rau cov cement kiln" txau cov SCR denitrifying txo tus neeg sawv cev rau peb ib feem ntawm lub preheater ntawm qhov kawg ntawm cov cement kiln siv lub ascending flue los ntawm kev txo tus neeg sawv cev txhaj tshuaj.Cement kiln siab. Kub flue roj li ntawm 500 ~ 750 degree, txo tus neeg sawv cev gasification rau hauv cov pa ammonia.Cov roj ammonia yog tov nrog cov roj kub kub thiab ces nkag mus rau hauv cyclone separator.Cov nyhuv swirl ntawm cyclone yog siv los txhim kho cov pa cuam tshuam thiab ua rau cov cua kub cua kub cua sov li 500 ~ 750 degree. Gas thiab txo tus neeg sawv cev sib tov zoo.Tom qab dhau los ntawm lub qhov hluav taws xob flue ntawm lub preheater, tus neeg saib xyuas txo nkag mus rau SCR denitrification ntaus ntawv nruab rau hauv qab rau cov tshuaj tiv thaiv denitrification.Qhov tshuab no yog ib txoj hauv kev thiab cov cuab yeej siv rau kev sib xyaw gasification sib xyaw ntawm cement kiln SCR denitrifying txo tus neeg sawv cev. nrog kev nqis peev tsawg thiab cov nqi khiav lag luam, kev siv hluav taws xob tsawg, kev nyab xeeb siab thiab kev ntseeg siab.Nyob rau hauv cov thev naus laus zis uas twb muaj lawm, cov tshuaj ammonia npog thaj tsam me me thiab nws cov denitrification efficiency tsis siab.
Txhawm rau kom kov yeej qhov tsis txaus ntawm cov cuab yeej siv tam sim no, peb lub tuam txhab muab ib hom nitrogen-txo ammonia txau cov cuab yeej rau lub tshuab ua hluav taws xob ua ntej hauv cov cement Hoobkas.To daws qhov teeb meem ntawm qhov tsis tshua muaj nitrogen tshem tawm efficiency tom qab ammonia spraying.Ammonia dej yog txhaj rau hauv riser. flue ntawm preheater cyclone separator, NOX yog txo rau nitrogen, thiab ammonia dej yog zoo dua nyob rau hauv lub riser flue ntawm preheater cyclone separator.Maximize kev pab cuam kom txo tau NOX emissions, yog li ntxiv txo NOX emissions.Los ntawm cov nram qab no kev daws teeb meem:
Cov qauv siv hluav taws xob cuam tshuam nrog nitrogen-txo ammonia txau cov cuab yeej ntawm cov tshuab hluav taws xob hauv lub tshuab ua hluav taws xob hauv cov cement, suav nrog cov tshuab hluav taws xob sib cais thiab ntau cov phom ammonia txau. Lub nozzle ntawm ammonia spray phom txuas mus rau qhov nce flue ntawm cyclone separator, thiab lub nozzle ntawm ammonia spray gun yog teem downward. Qhov siab ntawm ammonia spray phom yog 1-1.5m los ntawm qhov nce flue ntawm cyclone separator.Lub nraub qaum kawg ntawm ammonia tsuag phom yog muab nrog ammonia inlet thiab cua inlet, thiab pem hauv ntej kawg ntawm ammonia spray phom txuas mus rau ib qho kawg ntawm qhov nce flue ntawm lub raj cua daj cua dub thiab muab cov ntaub thaiv npog tiv thaiv.Cov ntaub thaiv npog yog ua los ntawm cov kub kub resistant, corrosion resistant thiab hnav-resistant cov ntaub ntawv.
Tus naj npawb ntawm cov phom phom ammonia yog 4-8, muab faib sib npaug ntawm sab nraud ntawm qhov hluav taws kub ntawm cua daj cua dub.
Piv nrog rau cov cuab yeej technology uas twb muaj lawm, cov txiaj ntsig ntawm cov tshuab no yog raws li hauv qab no:
Muaj plaub lossis rau rau ammonia tshuaj tsuag phom sib npaug sib npaug ntawm qhov nce flue ntawm lub preheater cyclone separator, tab sis lawv tsis tau nruab rau hauv lub qhov cub decomposition.Qhov laj thawj yog vim li cas cov plua plav concentration hauv qhov nce flue ntawm cyclone separator yog qis dua li hauv decomposing rauv, uas txo qhov cuam tshuam ntawm cov hmoov av ntawm ammonia adsorption thiab txhim kho cov tshuaj tiv thaiv ntawm ammonia thiab nitrogen oxides.Cov tshuaj tiv thaiv kub yog li 800 ~ 1100 degree, yog li AM yog qhov tsim nyog.
