Qhov kev sib txuas ntawm cov thee hauv cov chaw siv hluav taws xob tsim cov khoom pov tseg, xws li hauv qab thiab ya cov roj tshauv, thiab cov roj Fluent rau cov cua. Ntau cov nroj tsuag yuav tsum tau tshem cov tshuaj pleev kom tau cov roj flux uas siv cov roj desulfurization (FGD). Qhov peb ua fGD thev naus laus zis siv hauv Asmeskas yog cov ntaub qhwv ntub (85% ntawm kev teeb tsa), qhuav scrubbing (12%), thiab kev txhaj tshuaj txhuam qhuav (3%). Ntub cov ntaub softbers feem ntau tshem tawm ntau dua 90% ntawm cov kua zaub, piv rau cov khoom tawg, uas tshem tawm 80%. Kab lus no nthuav qhia txog lub xeev-ntawm-cov-kos duab thev naus laus zis rau kev kho cov dej khib nyiab uas yog tsim los ntawm ntub dejFGD Tshuab.
Ntub dej FGD cov hauv paus
Ntub dej FGD thev naus laus zis muaj nyob rau hauv seem slurry reactor thiab cov khib nyiab dewatering seem. Ntau hom kev nqus tau siv, suav nrog ntim thiab tais yees, venturi hloov, thiab tsuag cov kws kho pa hauv seem reactor. Cov nqus nruab nrab ntawm cov acidic gasses nrog cov alkaline slurry ntawm txiv qaub, sodium hydroxide, lossis limestone. Rau ntau cov laj thawj kev lag luam, superer scrubbers zoo li siv cov limestone slurry.
Thaum limestone reacts nrog sox hauv kev txo cov kev mob uas txo qis ntawm Sulfarite, yog li hloov pauv mus rau hauv sulfite, thiab ib tug slurry nplua nuj hauv calcium sulfite yog tsim tawm. Ua ntej FGD systems (raug xa mus ua cov tshuaj oxidation ua ntej los yog txwv tsis pub muaj cov khoom siv calcium los ntawm-cov khoom lag luam. Tshiab tshiabFGD Tshuabntiav cov oxidation reactor nyob rau hauv uas cov calcium sulfite slurry yog hloov mus calcium sulfate (gypsum); Cov no tau raug xa mus rau lub limestone yuam oxidation (LSFO) FGD lub tshuab.
Lwm yam LSFO FGD lub tshuab siv tau yog ib qho tshuaj tsuag ntau dua abiration nrog cov tshuaj tua kab rau hauv lub hauv paus (daim duab 1) lossis lub zog bubbler. Nyob rau hauv txhua tus roj yog nqus tau nyob rau hauv ib limestone slurry nyob rau hauv anoxic tej yam kev mob; Lub slurry ces dhau mus rau ib lub areobic reactor lossis cov tshuaj tiv thaiv, qhov twg hloov pauv mus rau sulfate los hloov, thiab gypsum precipitates. Lub sijhawm kaw hydraulic nyob rau hauv oxidation reactor yog li 20 feeb.
1. Txau kab limestone forced oxidation (LSFO) FGD system. Nyob rau hauv ib lsfo Scrubber slurry slurry slurry hla mus rau ib tug reactor, qhov twg cua ntxiv rau quab yuam oxidation ntawm sulfite mus rau sulfate. Qhov kev oxidation no tshwm sim hloov selenite mus rau selenate, uas ua rau kev kho mob tom ntej. Tau qhov twg los: CH2M Hill
Cov kab ke no feem ntau ua haujlwm nrog cov khib nyiab ntawm 14% rau 18%. Tshem tawm cov khib nyiab muaj cov khoom nplua thiab ntxhib gypsum cov khib nyiab, ya tshauv, thiab inert cov khoom siv nrog lub limestone. Thaum cov khib nyiab ncav cuag ib qho kev txwv siab tshaj plaws, slurry yog ntxuav. Feem ntau LSFO FGD lub tshuab siv cov khib nyiab sib cais thiab cov tshuab dewatering sib cais kom cais gypsum thiab lwm yam khib nyiab los ntawm cov dej ntxuav tawm (Daim Duab 2).
2. FGD Purge Gypsum dewatering system. Nyob rau hauv ib tug neeg nyiam gypsum deitatering system hais nyob rau hauv lub purge tau faib, lossis sib cais, ua ntu zus thiab zoo nkauj. Cov nplais zoo sib cais hauv cov phydroclone los ua ib qho qab ntawm gypsum muaju (rau cov ntsiab lus muaj peev xwm ua tau kom muaj lub tshuab nqus dej tsis muaj zog nrog lub tshuab nqus tsev. Tau qhov twg los: CH2M Hill
Qee tus FGD lub tshuab siv cov kev sib tsoo thickeners lossis dhuav cov khoom siv los yog dewatering, tab sis feem ntau siv cov tshuab hluav taws xob thiab feem ntau siv cov tshuab nqus dej. Qee tus neeg yuav siv ob lub hydroclones hauv koob kom nce cov khib nyiab tshem tawm hauv cov txheej txheem dewatering. Ib feem ntawm hydroclone txeej tuaj yeem xa rov qab mus rau FGD system los txo cov dej khib nyiab.
Tej zaum yuav tau pib thaum muaj cov tshuaj chlorides hauv fgd slurry, tsim nyog los ntawm kev txwv tsis kam ntawm FGD system cov khoom siv tsim kho.
FGD cov yam ntxwv lim dej
Ntau tus cuam tshuam cuam tshuam rau FGD cov tshuaj lim dej, xws li cov thee thiab limestone muaj pes tsawg leeg, hom ntawm cov kws txhuam hniav, thiab cov gypsum-dewatering system siv. Coal pab txhawb cov pa roj acidic, thiab cov tshuaj fluorides, thiab sulfate - thiab xws li cov khoom siv volatile, xws li cov mercury, boron, cadmium, thiab zinc. Lub limestone pab cov hlau thiab txhuas (los ntawm cov av nplaum cov miner) rau FGD dej khib nyiab. Limestone feem ntau yog pulverized nyob rau hauv ib tug ntub pob zeb ntub, thiab cov yaig thiab corrosion ntawm cov pob los pab txhawb hlau rau lub limo slurry. Cov noob txha yog ua rau pab txhawb cov inert, uas yog ib qho ntawm cov laj thawj uas cov dej khib nyiab yog ntxuav los ntawm cov txhuam hniav.
From: Thomas E. Higgins, Phd, PE; A. Thomas Sandy, PE; Thiab XEEM W. GIVENS, PE.
Email: caroline@rbsic-sisic.com
Lub sij hawm Post: Lub Yim Hli 04-2018