Qhov zaus, lub sij hawm, thiab qhov tob ntawm lub ncov shaving yog nce. Sib sib zog nqus ncov shaving tsis tsuas yog ntsuas kev ntseeg siab thiab kev lag luam ntawm chav ua haujlwm, tab sis tseem cuam tshuam rau kev ua haujlwm ruaj khov ntawm cov chaw tiv thaiv ib puag ncig thiab kev ua raws li cov pa phem. Rau kev hloov pauv hloov pauv tau yooj yim, ntau txoj kev tshawb fawb tau ua nyob rau hauv boiler, chav turbine, auxiliary khoom, tswj system, thiab flue gas denitrification, tab sis rau flue gas desulfurization.
Muaj kev tshawb fawb me me txog yuav ua li cas hloov tau sai sai rau qhov sib sib zog nqus ncov shaving (tshwj xeeb tshaj yog nce ceev ceev) hauv FGD system. Yav dhau los, cov khoom siv hluav taws xob hluav taws xob desulfurization (FGD) hauv cov hluav taws xob hluav taws xob hluav taws xob hauv Suav teb feem ntau siv cov txheej txheem limestone / gypsum ntub dej desulfurization, qhov twg cov absorbent yog limestone (tsuas yog tsim los ntawm CaCO3). Qhov no desulfurizer kuj pheej yig thiab muaj peev xwm desulfurization zoo, tab sis vim nws cov solubility tsis tshua muaj thiab tsis muaj zog alkalinity, muaj lub tog raj kheej hauv kev txhim kho desulfurization ntxiv tom qab ncav cuag ib theem.
Cov thee tam sim no tau dhau los ua nruj thiab cov hom thee yog qhov nyuaj thiab ntau yam. High sulfur thee (tom qab no hu ua "high sulfur thee") lossis tsis sib xws thee sib xyaw ua rau muaj teeb meem loj rau SO2 emissions. Cov txheej txheem xws li kev ua kom zoo ntawm cov twj slurry ncig, kho qhov zaus ntawm cov twj tso kua mis, tswj cov pH tus nqi ntawm kev nqus ntauwd slurry, thiab siv desulfurization additives rau kev hloov kho sai thiab sib sib zog nqus muaj kev ua haujlwm tsis txaus thiab ntau qhov tsis zoo. Thaum lub sij hawm ceev thiab nquag thauj cov txheej txheem ntawm chav tsev, qhov tsim muaj peev xwm thiab cov lus teb ceev ntawm FGD tsis tuaj yeem ua tau raws li qhov xav tau, thiab SO2 emission concentration (hauv tsab xov xwm no, SO2 "concentration" hais txog huab hwm coj concentration) feem ntau tshaj tus qauv. , uas ua rau muaj kev kub ntxhov loj rau cov chaw tsim hluav taws xob thiab cov neeg ua haujlwm ua haujlwm; Yog li ntawd, nws yog ib qho tsim nyog los tsim cov thev naus laus zis tshiab los daws qhov teeb meem no thiab txhim kho kev hloov pauv thiab kev muaj peev xwm teb xwm ceev ntawm FGD uas twb muaj lawm. Kab lus no siv lub zog 600MW ua piv txwv thiab ua qhov kev sim siv hom tshiab ntawm kev ua haujlwm siab desulfurization absorbent (tom qab no hu ua "tshiab desulfurizer") los daws qhov teeb meem ntawm SO2 emissions ntau dhau thaum lub sij hawm sib sib zog nqus peak shaving thiab ceev ceev load. chav tsev, thaum txhim kho qhov kev hloov pauv ntawm FGD system rau sulfur-muaj cov thee.
Tshiab desulfurizer thiab nws txoj cai desulfurization
Tus tshiab desulfurizer yog calcium raws li absorbent, feem ntau yog tsim los ntawm zoo heev Ca (OH) 2. Nws siv calcium ua substrate thiab ib co alkaline hlau thiab carbonate ions ua additives. Tom qab ua kom muaj zog thiab hloov kho ntawm ntau yam kev ua haujlwm, nws ua tiav kev ua haujlwm zoo alkaline thiab tuaj yeem nqus tau SO2 zoo. Cov txheej txheem kev npaj yog raws li nram no: Ua tib zoo xaiv thiab calcined high-purity txiv qaub blocks (tsuas yog tsim los ntawm CaO) yog pub rau hauv lub digester los ntawm ib tug feeder, thiab dej thiab ib tug tshwj xeeb catalyst yog ntxiv rau zom cov txiv qaub blocks rau mature txiv qaub Ca (OH. ) 2. Tom qab ntawd, tom qab ntau theem pom thiab purification, impurities xws li inert insoluble tshuaj raug tshem tawm, thiab thaum kawg ib tug Ca (OH) 2 ncua kev kawm ntawv nrog ib tug loj feem ntawm txog 25% (muaj ib tug me me ntawm alkaline soluble tshuaj xws li Na2O thiab MgO muaj nyob rau hauv thawj cov txiv qaub) tau txais. Qhov loj me me ntawm cov desulfurizer tshiab yog hais txog 200nm soj ntsuam siv Malvern laser particle loj analyzer. Cov cim tseem ceeb ntawm cov khoom no yog: kua mis dawb, nrog cov khoom loj feem ntawm (25 ± 1)%; Qhov loj feem ntawm acidic insoluble tshuaj yuav tsum tsis pub tshaj 0.3%; Tus nqi pH tsis tsawg tshaj li 13. Piv nrog rau cov hydrated txiv qaub hmoov nyob rau hauv lub lag luam, cov khoom no muaj purity siab, me me fineness, thiab siab reactivity, tab sis tus nqi sib txawv tsis tseem ceeb.
Tag nrho cov kev sib npaug sib npaug rau kev nqus ntawm SO2 los ntawm cov desulfurizer tshiab yog
Nws tuaj yeem pom tau tias cov tshuaj tiv thaiv ntawm Ca (OH) 2 thiab limestone absorbing SO2 yog qhov pib zoo ib yam, thiab cov khoom lag luam los kuj yog tib yam. Yog li, qhov sib ntxiv ntawm cov desulfurizer tshiab yuav tsis muaj kev cuam tshuam rau kev ua haujlwm ntawm cov limestone / gypsum ntub dej flue gas desulfurization system. Qhov zoo ntawm cov desulfurizer tshiab yog raws li hauv qab no:
a) SO2 yog ib qho acidic oxide, thiab tus tshiab desulfurizer Ca (OH) 2 yog alkaline. Yog li ntawd, thaum ob qho tib si sib ntsib, muaj zog thiab irreversible acid-base neutralization cov tshuaj tiv thaiv yuav tshwm sim, nrog ib tug ntau dua cov tshuaj tiv thaiv tus nqi thiab kev ua ub no tshaj cov series ntawm qaug zog acid thiab qaug zog alkali ntsev cov tshuaj tiv thaiv ntawm limestone thiab SO2; Yog li ntawd, cov tshuaj tiv thaiv tus nqi thiab kev ua haujlwm saum npoo ntawm cov desulfurizer tshiab yog ntau dua li cov pa roj limestone.
b)Qhov loj me me ntawm cov desulfurizer tshiab yog cov concentrated, feem ntau nyob ib ncig ntawm 200nm. Piv nrog cov pa roj limestone hmoov (particle loj tsawg dua 44 μ m), qhov sib txawv me me ntawm ob yog ntau tshaj 200 zaug; Yog li ntawd, cov desulfurizer tshiab muaj qhov loj dua qhov chaw tshwj xeeb, ntau dua reactivity, thiab tuaj yeem hnov mob siab thiab nrawm nrog SO2 yam tsis muaj qhov seem. Vim yog thaj tsam me me ntawm limestone, tsis muaj zog alkali ntsev CaCO3, txog 10% impurities hauv limestone, thiab cov txheej txheem kev ua haujlwm ntawm cov pob zeb, 10% mus rau 20% ntawm limestone hmoov yuav tsis hnov mob thiab nyob twj ywm rau hauv lub nqus ntauwd, ua rau sedimentation thiab txawm scaling nyob rau hauv lub pej thuam.
c)Tus tshiab desulfurizer yog ib tug muaj zog alkali thiab CaCO3 yog ib tug qaug zog alkali ntsev. Tus qub muaj cov nyhuv ntau dua thiab ceev hauv kev txhim kho pH tus nqi ntawm lub nqus ntauwd slurry dua li yav tas los; Yog li ntawd, tus tshiab desulfurizer tuaj yeem nce pH tus nqi ntawm cov khoom nqus dej slurry sai sai thiab txhim kho cov nyhuv desulfurization ntawm lub nqus ntauwd.
d)Tus tshiab desulfurizer muaj thaj tsam loj thiab muaj zog ua haujlwm, yog li impurities xws li ya tshauv thiab limestone uas cuam tshuam rau qhov zoo ntawm slurry, nrog rau chloride ions, tsis tuaj yeem cuam tshuam nws cov tshuaj tiv thaiv. Nws muaj kev tswj xyuas zoo ntawm cov slurry uas tau ua kom tsis zoo los ntawm impurities.
e) Lub hardness ntawm cov desulfurizer tshiab yog qis dua li ntawm limestone, thiab Ca (OH) 2 yog ib qho alkali muaj zog, uas txo qhov hnav, txhaws, thiab acid corrosion ntawm cov khoom siv thiab cov kav dej hauv FGD system. Nws tuaj yeem txhim kho lub neej kev pabcuam ntawm cov khoom siv thiab cov kav dej thiab txo cov khoom siv tu cov nqi.
