1. Pre-kugadziriswa kwemvura yekugadzira
Mitumbi yemvura yakasikwa kazhinji ine madhaka, ivhu, humus uye zvimwe zvakaturikwa zvinhu uye colloidal tsvina uye mabhakitiriya, fungi, algae, mavhairasi uye mamwe tupukanana, vane kumwe kugadzikana mumvura, ndicho chikuru chinokonzera mvura turbidity, ruvara uye kunhuwa.Izvi zvakanyanyisa organic zvinhu zvinopinda muion exchanger, zvinosvibisa resin, zvinoderedza shanduko yeresin, uye zvinotokanganisa kunaka kweiyo desalting system.Coagulation kurapwa, kugadzirisa kujekesa uye filtration kurapwa ndiko kubvisa tsvina iyi sechinangwa chikuru, kuitira kuti zvinyorwa zvakaturikwa nyaya mumvura zvideredze kusvika pasi pe5mg / L, kureva kuti, kuwana mvura yakajekeswa.Izvi zvinonzi mvura pretreatment.Mushure mekugadzirisa, mvura inogona kushandiswa semvura yebhoiler chete kana yakanyungudutswa munyu mumvura inobviswa neion exchange uye magasi akanyungudika mumvura anobviswa nekupisa kana kupukuta kana kuvhuvhuta.Kana izvi zvisina kuchena zvisina kubviswa kutanga, kurapwa kunotevera (kubvisa) hakugone kuitwa.Naizvozvo, iyo coagulation kurapwa kwemvura chinhu chakakosha chinongedzo mukurapwa kwemvura.
Iyo pretreatment process ye thermal power plant ndeyekutevera: mvura mbishi → coagulation → kunaya nekujekesa → kusefa.Iyo coagulants inowanzoshandiswa mukugadzirisa maitiro ndeye polyaluminium chloride, polyferric sulfate, aruminiyamu sulfate, ferric trichloride, nezvimwewo. Izvi zvinotevera zvinonyanya kuunza kushandiswa kwe polyaluminium chloride.
Polyaluminium chloride, inonzi PAC, yakavakirwa paaluminium madota kana aruminiyamu zvicherwa seyakabikwa, pakupisa kwepamusoro uye imwe dzvinyiriro ine alkali uye aruminiyamu reaction inogadzirwa polymer, mbishi zvinhu uye kugadzirwa kwakasiyana, zvirevo zvechigadzirwa hazvina kufanana.Molecular formula yePAC [Al2(OH)nCI6-n]m, apo n inogona kuva chero nhamba pakati pa 1 na 5, uye m i integer ye cluster 10. PAC inouya mumarudzi akasimba uye emvura.
2.Coagulation mechanism
Pane matatu makuru mhedzisiro yecoagulants pane colloidal particles mumvura: magetsi neutralization, adsorption bridging uye kutsvaira.Ndeupi weaya matatu mhedzisiro ndiwo mukuru unoenderana nerudzi uye dosage yecoagulant, hunhu uye zvirimo zvecolloidal particles mumvura, uye pH kukosha kwemvura.Iyo nzira yekuita ye polyaluminium chloride yakafanana neyealuminium sulfate, uye maitiro ealuminium sulfate mumvura anoreva maitiro eAl3 + kugadzira marudzi akasiyana ehydrolyzed.
Polyaluminium chloride inogona kutorwa seyakasiyana-siyana yepakati zvigadzirwa mukuita kwehydrolysis uye polymerization yealuminium chloride muAl(OH)3 mune mamwe mamiriro.Inowanikwa zvakananga mumvura mumhando yemhando dzakasiyana dzepolymeric uye A1 (OH) a (s), pasina hydrolysis process yeAl3 +.
3. Kushandisa uye kupesvedzera zvinhu
1. Kupisa kwemvura
Iyo tembiricha yemvura ine pesvedzero yakajeka pane coagulation kurapwa maitiro.Kana tembiricha yemvura yakadzikira, iyo hydrolysis yecoagulant yakanyanya kuoma, kunyanya kana tembiricha yemvura yakadzikira kupfuura 5 ℃, mwero wehydrolysis unononoka, uye iyo flocculant yakaumbwa ine yakasununguka chimiro, yakakwira yemvura uye zvimedu zvakanaka.Kana tembiricha yemvura yakadzikira, kunyungudika kwecolloidal particles kunowedzerwa, nguva yeflocculation yakareba, uye mwero wekudonha unononoka.Tsvagiridzo inoratidza kuti tembiricha yemvura ye25 ~ 30 ℃ inonyanya kukodzera.
2. pH kukosha kwemvura
Iyo hydrolysis process ye polyaluminium chloride inzira yekuenderera kuburitswa kweH +.Naizvozvo, pasi pemamiriro akasiyana epH, pachave neakasiyana hydrolysis intermediates, uye yakanakisa pH kukosha kwe polyaluminium chloride coagulation kurapwa kazhinji iri pakati pe6.5 ne7.5.Iyo coagulation effect yakakwira panguva ino.
3. Dosage ye coagulant
Kana iyo yakawanda ye coagulant yakawedzerwa haina kukwana, iyo yakasara turbidity mumvura yekuyerera yakakura.Kana iyo yakawanda yakawandisa, nekuti iyo colloidal particles mumvura adsorb yakawandisa coagulant, iyo yekuchaja pfuma yecolloidal particles inoshanduka, zvichikonzera kusara kwehuturu mutsvina inowedzera zvakare.Iyo coagulation process haisi nyore kemikari kuita, saka dosage inodiwa haigone kutariswa zvinoenderana nekuverenga, asi inofanirwa kutariswa zvinoenderana neiyo chaiyo mhando yemvura kuti uone dosi yakakodzera;Kana hutano hwemvura huchichinja mwaka, muyero unofanirwa kugadziriswa maererano.
4. Bata wepakati
Muchiito chekugadzirisa coagulation kana kumwe kurapwa kwemvura, kana pane imwe nhanho yedhaka mumvura, mhedzisiro yekurapa coagulation inogona kuvandudzwa zvakanyanya.Inogona kupa nzvimbo yakakura yepamusoro, kuburikidza neadsorption, catalysis uye crystallization musimboti, inovandudza mhedzisiro yecoagulation kurapwa.
Coagulation precipitation inzira inoshandiswa zvakanyanya pakurapa mvura parizvino.Polyaluminium chloride indasitiri inoshandiswa semvura yekurapa flocculant, ine yakanaka coagulant kuita, hombe floc, shoma dosage, yakakwirira kunyatsoshanda, inokurumidza kunaya, kureba kwekushandisa uye zvimwe zvakanakira, zvichienzaniswa neyechinyakare flocculant dosage inogona kuderedzwa ne1/3 ~ 1. /2, mutengo unogona kuponeswa 40%.Yakasanganiswa nekushanda kwevhavha isina sefa uye yakabatidzwa kabhoni sefa, iyo turbidity yemvura yakasvibira yakaderedzwa zvakanyanya, effluent mhando yedesalt system inovandudzwa, uye kugona kwekuchinjana kwedesalt resin kunowedzerwawo, uye mutengo wekushandisa wakaderedzwa.
Nguva yekutumira: Mar-22-2024
