Ho chesoa ha mashala litsing tsa phepelo ea motlakase ho hlahisa litšila tse tiileng, joalo ka molora o ka tlase le oa fly, le khase ea flue e ntšetsoang sepakapakeng. Limela tse ngata li hlokoa ho tlosa likhase tsa SOx ho tsoa khase ea flue ho sebelisa mekhoa ea flue gas desulfurization (FGD). Litheknoloji tse tharo tse etellang pele tsa FGD tse sebelisoang US ke ho hohla metsi (85% ea lisebelisoa), ho korola (12%), le ente e omeletseng ea sorbent (3%). Li-scrubber tsa metsi li atisa ho tlosa ho feta 90% ea SOx, ha e bapisoa le li-scrubber tse omileng, tse tlosang 80%. Sengoliloeng sena se hlahisa mahlale a morao-rao a ho hloekisa metsi a litšila a hlahisoang ke metsi.Sistimi ea FGD.
Metheo ea FGD e metsi
Litheknoloji tsa Wet FGD li na le karolo e tšoanang ea slurry reactor le karolo ea ho tlosa metsi a tiileng. Mefuta e fapa-fapaneng ea li-absorber e 'nile ea sebelisoa, ho akarelletsa le litora tse pakiloeng le li-tray, li-scrubber tsa venturi, le li-spray scrubbers karolong ea reactor. Li-absorbers li fokotsa likhase tse nang le asiti ka alkaline slurry ea lime, sodium hydroxide, kapa limestone. Bakeng sa mabaka a 'maloa a moruo, li-scrubber tse ncha li atisa ho sebelisa slurry ea limestone.
Ha lejoe la mokoetla le sebetsana le SOx maemong a fokolang a mokelikeli, SO 2 (karolo e kholo ea SOx) e fetoloa ho ba sulfite, 'me ho hlahisoa slurry e nang le calcium sulfite e ngata. Litsamaiso tsa pejana tsa FGD (tseo ho thoeng ke tsa tlhaho tsa oxidation kapa inhibited oxidation systems) li ile tsa hlahisa calcium sulfite by-product. E nchaSistimi ea FGDsebelisa mochini o etsang oxidation moo calcium sulfite slurry e fetoloang ho calcium sulfate (gypsum); tsena li bitsoa li-limestone force oxidation (LSFO) FGD systems.
Litsamaiso tse tloaelehileng tsa sejoale-joale tsa LSFO FGD li sebelisa mochini o monyang tora oa spray o nang le mochini o kopanyang oxidation botlaaseng (setšoantšo sa 1) kapa sistimi ea jet bubbler. Ho e 'ngoe le e' ngoe khase e kenngoa ka har'a slurry ea lejoe la mokoetla tlas'a maemo a anoxic; slurry ebe e fetela sebakeng sa aerobic reactor kapa reaction zone, moo sulfite e fetoloang ho sulfate, le gypsum precipitates. Nako ea ho ts'oaroa ha hydraulic ho reactor ea oxidation ke metsotso e ka bang 20.
1. Ho fafatsa kholumo ea mokoetla e qobelletsoeng oxidation (LSFO) FGD system. Ka har'a LSFO scrubber slurry e fetela ka sehatsetsing, moo moea o kenyelletsoang ho qobella oxidation ea sulfite ho sulfate. Oxidation ena e bonahala e fetola selenate ho selenate, e bakang mathata a kalafo hamorao. Mohloli: CH2M HILL
Litsamaiso tsena hangata li sebetsa ka lintho tse tiileng tse emisitsoeng tsa 14% ho isa ho 18%. Lintho tse tiileng tse emisitsoeng li na le lintho tse tiileng le tse mahoashe tsa gypsum, molora oa fofa, le thepa e sa sebetseng e hlahisitsoeng ka mokoetla. Ha lintho tse tiileng li fihla moeling o ka holimo, slurry e hloekisoa. Litsamaiso tse ngata tsa LSFO FGD li sebelisa karohano ea lintho tse thata tsa mochini le lits'ebetso tsa ho ntša metsi ho arola gypsum le lintho tse ling tse tiileng ho tsoa ho metsi a hloekisang (Setšoantšo sa 2).
2. FGD hloekisa gypsum dewatering system. Ka mokhoa o tloaelehileng oa ho ntša metsi ka gypsum, likaroloana tse ka har'a hloekiso li arotsoe, kapa li arotsoe, ka likaroloana tse mahoashe le tse ntle. Likaroloana tse ntle li arohane ka ho phalla ho tloha ho hydroclone ho hlahisa metsi a mangata a nang le likristale tse kholo tsa gypsum (bakeng sa thekiso e ka 'nang ea rekisoa) tse ka fokotsoang ho isa mongobo o fokolang ka mokhoa oa ho ntša metsi ka lebanta la vacuum. Mohloli: CH2M HILL
Litsamaiso tse ling tsa FGD li sebelisa li-gravity thickeners kapa matangoana a ho lokisa bakeng sa lihlopha tse tiileng le ho ntša metsi, 'me tse ling li sebelisa li-centrifuges kapa li-rotary vacuum dewatering systems, empa litsamaiso tse ngata tse ncha li sebelisa li-hydroclone le mabanta a vacuum. Ba bang ba ka sebelisa li-hydroclone tse peli ka letoto ho eketsa ho tlosoa ha lintho tse tiileng tsamaisong ea ho ntša metsi. Karolo ea phallo ea hydroclone e ka khutlisetsoa ho sistimi ea FGD ho fokotsa phallo ea metsi a litšila.
Ho hloekisa ho ka boela ha qalisoa ha ho e-na le li-chloride tse ngata ka har'a slurry ea FGD, e hlokahalang ke meeli e behiloeng ke khanyetso ea kutu ea thepa ea kaho ea tsamaiso ea FGD.
Litšobotsi tsa FGD Metsi a litšila
Mefuta e mengata e ama sebopeho sa metsi a litšila a FGD, joalo ka sebopeho sa mashala le lejoe la mokoetla, mofuta oa scrubber, le mokhoa oa ho tlosa metsi ka gypsum o sebelisitsoeng. Mashala a kenya likhase tse nang le asiti - joalo ka chloride, fluorides, le sulfate - hammoho le litšepe tse sa fetoheng, ho kenyelletsa arsenic, mercury, selenium, boron, cadmium le zinki. Lejoe la mokoetla le fana ka tšepe le aluminium (ho tloha liminerale tsa letsopa) ho ea ho metsi a litšila a FGD. Lejoe la mokoetla hangata le siloa ka leloaleng la bolo e metsi, 'me khoholeho le ho bola ha libolo li kenya tšepe ho slurry ea lejoe la mokoetla. Matsopa a atisa ho kenya letsoho licheleteng tsa lichelete, e leng le leng la mabaka a etsang hore metsi a litšila a hloekisoe ho tloha ho scrubber.
Ho tsoa ho: Thomas E. Higgins, PhD, PE; A. Thomas Sandy, PE; le Silas W. Givens, PE.
Lengolo-tsoibila:[imeile e sirelelitsoeng]
Nako ea poso: Aug-04-2018