Kev kho denitration ntawm fais fab nroj tsuag
Landfill gas power generation hais txog kev tsim hluav taws xob los ntawm ntau cov roj biogas (LFG landfill gas) uas tsim los ntawm anaerobic fermentation ntawm cov organic teeb meem hauv qhov chaw pov tseg, uas tsis yog tsuas yog txo cov pa phem los ntawm cov khib nyiab incineration, tab sis kuj ua rau siv tau zoo.
Kev taw qhia txuj ci
Lub tshuab hluav taws xob hluav taws xob yog lub tshuab hluav taws xob (nuclear power plant, wind power plant, solar power plant, etc.) uas hloov qee yam ntawm lub zog raw (xws li dej, chav, diesel, roj) rau hauv hluav taws xob rau cov chaw ruaj khov lossis kev thauj mus los.
Txoj kev
Flue gas denitration hais txog kev txo cov NOx generated rau N2 kom tshem NOx hauv flue gas.Raws li cov txheej txheem kev kho mob, nws tuaj yeem muab faib ua ntub dej denitration thiab qhuav denitration.Qee cov kws tshawb fawb hauv tsev thiab txawv teb chaws kuj tau tsim ib txoj hauv kev los kho NOx cov pa khib nyiab nrog cov kab mob.
Txij li ntau tshaj 90% ntawm NOx nyob rau hauv cov roj flue tso tawm los ntawm lub combustion system yog tsis muaj, thiab tsis yog ib qho nyuaj rau yaj nyob rau hauv dej, kev kho ntub dej ntawm NOx tsis tuaj yeem ua los ntawm kev ntxuav yooj yim.Lub hauv paus ntsiab lus ntawm flue gas denitration yog oxidize tsis mus rau NO2 nrog oxidant, thiab cov generated NO2 yog absorbed los ntawm dej los yog alkaline tov, thiaj li kom paub denitration.O3 oxidation absorption txoj kev oxidizes tsis rau NO2 nrog O3, thiab ces absorbs nws nrog dej.HNO3 kua uas tsim los ntawm txoj kev no yuav tsum tau ua kom muaj zog, thiab O3 yuav tsum tau npaj kom muaj hluav taws xob siab, nrog rau kev nqis peev ntau thiab cov nqi ua haujlwm.ClO2 oxidation-txo txoj kev ClO2 oxidizes tsis rau NO2, thiab ces txo NO2 rau N2 nrog Na2SO3 aqueous tov.Txoj kev no tuaj yeem ua ke nrog cov tshuab ntub dej desulfurization siv NaOH ua desulfurizer, thiab cov khoom siv tshuaj tiv thaiv desulfurization Na2SO3 tuaj yeem siv los ua tus reductant ntawm NO2.Tus nqi denitration ntawm ClO2 txoj kev tuaj yeem ncav cuag 95% thiab desulfurization tuaj yeem ua tiav tib lub sijhawm, tab sis tus nqi ntawm ClO2 thiab NaOH yog siab thiab cov nqi khiav lag luam nce.
Wet flue gas denitration technology
Wet flue gas denitration siv lub hauv paus ntsiab lus ntawm dissolving NOx nrog kua absorbent los ntxuav cov thee-fired flue gas.Qhov teeb meem loj tshaj plaws yog tias tsis muaj qhov nyuaj rau yaj hauv dej, thiab feem ntau nws yuav tsum tau oxidize tsis muaj NO2 ua ntej.Yog li, feem ntau, tsis muaj oxidized los ua NO2 los ntawm reacting nrog oxidant O3, ClO2 los yog KMnO4, thiab ces NO2 yog absorbed los ntawm dej los yog alkaline tov kom paub flue gas denitration.
(1) Dilute nitric acid absorption txoj kev
Vim hais tias cov solubility ntawm tsis muaj thiab NO2 nyob rau hauv nitric acid yog ntau ntau dua li nyob rau hauv dej (piv txwv li, lub solubility ntawm tsis muaj nyob rau hauv nitric acid nrog ib tug concentration ntawm 12% yog 12 lub sij hawm ntau dua li nyob rau hauv dej), lub tshuab siv dilute nitric. acid absorption txoj kev los txhim kho tus nqi tshem tawm ntawm NOx tau dav siv.Nrog rau qhov nce ntawm nitric acid concentration, nws qhov nqus tau zoo dua qub, tab sis xav txog kev lag luam thiab cov nqi, cov nitric acid concentration siv nyob rau hauv kev ua hauj lwm feem ntau tswj nyob rau hauv thaj tsam ntawm 15% ~ 20%.Kev ua haujlwm ntawm NOx nqus los ntawm dilute nitric acid tsis yog tsuas yog cuam tshuam nrog nws cov concentration, tab sis kuj muaj feem xyuam rau qhov nqus dej thiab siab.Tsis tshua muaj kub thiab siab siab yog qhov tsim nyog rau kev nqus ntawm NOx.
(2) Txoj kev nqus dej Alkaline
Nyob rau hauv txoj kev no, alkaline tov xws li NaOH, Koh, Na2CO3 thiab NH3 · H2O yog siv los ua absorbents rau chemically nqus NOx, thiab qhov nqus ntawm ammonia (NH3 · H2O) yog siab tshaj.Txhawm rau txhawm rau txhim kho qhov nqus tau zoo ntawm NOx, ob-theem nqus ntawm ammonia alkali tov yog tsim: ua ntej, ammonia reacts tag nrho nrog NOx thiab dej vapor los tsim ammonium nitrate dawb pa luam yeeb;Tom qab ntawd cov NOx uas tsis muaj kev cuam tshuam yog txuas ntxiv nrog cov tshuaj alkaline.Nitrate thiab nitrite yuav raug tsim, thiab NH4NO3 thiab nh4no2 kuj yuav yaj hauv cov tshuaj alkaline.Tom qab ob peb lub voj voog ntawm kev nqus dej, tom qab cov tshuaj alkali tas lawm, cov tshuaj uas muaj nitrate thiab nitrite yog concentrated thiab crystallized, uas tuaj yeem siv ua chiv.
Cov khoom qeb
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