Kuroverwa kwemarasha muzvivakwa zvechizvarwa zvinogadzira marara akasimba, senge pasi uye kubhururuka ash, uye flue gasi iro rakaburitswa mumhepo. Zvirimwa zvakawanda zvinodikanwa kuti ubvise sox emissions kubva kune flue gasi uchishandisa flue gasi desguzation (FGD) system. Matatu anotungamira eFGD eFGD anoshandiswa muUS ndeye yakanyorova kutsvaira (85% yezvigadziro), kuoma kutsvaira (12%), uye yakaoma sorbent jekiseni (3%). Makungwa emvura anowanzo bvisa anopfuura 90% yeiyo sox, achienzaniswa nemachira akaoma, ayo anobvisa 80%. Ichi chinyorwa chinopa nyika-ye-iyo-iyo-iyo-yemi tekinoroji yekubata iyo marara iyo inogadzirwa nekunyorovaFGD Systems.
Wet FGD Basics
Wet FGD tekinoroji ine zvakajairika chikamu chekutanga chikamu uye chikamu chinonyadzisa. Mhando dzakasiyana-siyana dzeVanobata dzakashandiswa, kusanganisira dzakatakurwa uye tray shongwe, venturi zvibodzwa, uye spray zvidhinha muchikamu chekutanga. Vabatsiri vanodzokorora maAdidic gasses neAlkaline slappry ye lime, sodium hydroxide, kana limestone. Kune akati wandei ezvehupfumi zvikonzero, zvidhinha zvitsva zvinowanzo kushandisa limestone slurry.
Kana limestone inobata ne sox mukuderedza mamiriro ezvekudzora, saka 2 (chinhu chikuru cheSox) chinoshandurwa kuita Sulfite, uye pfuma yakadzika muCalcium Sulfite inogadzirwa. Pakutanga FGD Systems (inotaurwa nezvenyaya yemasikirwo oxidation kana inhibited oxidation masystem) yakagadzira calcium sulfite ne-chigadzirwa. NewFGD SystemsShandira Oxidation Recentor mune iyo Calcium Sulfite Slappry inoshandurwa kuna Calcium Sulfate (Gypsum); Izvi zvinotaurwa nezve serimestone kumanikidzwa oxidation (LSFO) FGD Systems.
Chaizvoizvo LSFO FGD masisitimu anoshandisa chero spray tower inonyudza neyekuwedzera oxidation yekugadzirisa (Mufananidzo 1) kana jet bubbler system. Muga mumwe neumwe gasi rinobatikana mune rimwe rimendi slurry pasi pemamiriro ezviuru enhema; Iyo slurry inobva yaipfuudza kune aerobic inogadzirisa kana reaction zone, uko Sulfite inoshandurwa kuti isimbe, uye gypsum pripolitates. Hydraulic nguva yekuvharirwa nguva mune oxidation Recentor ndeye anenge maminitsi makumi maviri.
1. Spray column limestone yakamanikidzwa oxidation (LSFO) FGD system. Mune yeLSFO scrubber slurry inopfuura kusvika kune inowedzera, uko mweya unowedzerwa kumanikidza oxidation ye sulfite yekusagadzikana. Oxidation iyi inoita seinoshandura Seleni kuti Selenies, zvichikonzera matambudziko ekurapa ekurapa. Kwayaka: Ch2m Hill
Aya masisitimu anowanzo shanda neakasimudzwa solids ye14% kusvika 18%. Smodered solids inosanganisira yakanaka uye coarse gypsum solids, fly leh, uye inert zvinyorwa zvakaunzwa nedombo redare. Kana iyo solids inosvika muganho wepamusoro, slurry inonatswa. Mazhinji LSFO FGD masisitimu anoshandisa mechancal solids kupatsanurana uye dewatering masisitimu kuti aparadzanise gypsum uye mamwe mimwe solids kubva kune iyo purge mvura (Mufananidzo 2).
2. FGD Purge Gypsum Dewating System. Mune yakajairika gypsum dewating system zvidimbu muurge inogadziriswa, kana kupatsanurwa, kuita zvidimbu uye zvidimbu zvakanaka. Zvinyorwa zvakanaka zvakaparadzaniswa kubva kuHydroclone kuti ubudise zvinyoronyoro zvezvinyorwa zvikuru zveGypsum Kwayaka: Ch2m Hill
Mamwe maFGD masisitimu anoshandisa magirazi ekuratidzira kana kugadzirisa madziva ekuratidzira kweSolids kuiswa uye kusvibiswa, uye kumwe kushanduka centrif Vamwe vangashandisa mahyroclon maviri muzvikamu zvekuwedzera solids kubvisa mune dewating system. Chikamu chehydroclone kuyerera chinogona kudzoserwa kuFGD system kuti uderedze mvura yekuyerera.
Kucheneswa kunogona kutangwa kana paine chivakwa chehuku yeFGD iri muFGD slurry, yakafanirwa nemiganhu yakatarwa neiyo corrostion kuramba kweiyo FGD system yezvivakwa zveFGD.
FGD makasviba maater maitiro
Vakawanda vanoshanduka vanokanganisa kuumbwa kweFGD Marasha anopa magasi acidic - akadai seChidides, fluorides, uye sulfate - pamwe nesimbi, kusanganisira Arsenic, Merenic, Selenium, Boron, Cadmium, uye Zinc. Iyo Limestone inopa iyo simbi uye aluminium (kubva kune clay zvicherwa) kune iyo fgd marara. Limestone kazhinji inowanzoitwa mune yakanyorova bhora ball, uye kuumbwa uye kuronga kwemabhora kunopa simbi kune iyo limestone slurry slurry slurry slurry slurry slurry. CLIYYS inowanzoita kuti ive iyo inerer faindi, ndechimwe chezvikonzero zvinoshandiswa nemvura ine mitsipa inocheneswa kubva pachigadzirwa.
Kubva: Thomas E. Higgins, PHD, PE; A. Thomas Sandy, Pe; naSirasi W. anopa, pe.
Email: caroline@rbsic-sisic.com
Kutumira Nguva: Aug-04-2018