Cov ntsiab lus: Kev tsim roj teeb thiab ntub dej rov ua dua tshiab ntawm cov roj teeb hluav taws xob ua kom muaj ntau qhov siab - ntsev, nyuaj- los - kho cov dej khib nyiab. MVR evaporation crystallization yog cov cuab yeej siv tau los ua kom tiav cov dej khib nyiab pov tseg thiab cov ntsev ntsev rov qab. Kab lus no muab cov lus qhia ua tau zoo rau ib puag ncig engineers thiab cov kws tshaj lij cov txheej txheem, suav nrog cov txheej txheem txheej txheem, cov xwm txheej siv tau, cov ntsiab lus tseem ceeb ntawm kev tsim qauv, kev ua yuam kev thiab kev zam kev daws teeb meem, thiab thaj tsam daim ntawv thov kev lag luam.
Taw qhia: Kev nthuav dav sai ntawm tag nrho lub zog tshiab tsheb kev lag luam cov saw hlau ua rau ntau qhov siab -cov dej khib nyiab uas muaj sulfates, chlorides, cov hlau hnyav, thiab cov khoom seem hauv cov khoom siv roj teeb thaum lub sij hawm tsim cov roj teeb thiab ntub dej ntawm cov roj teeb so. Cov txheej txheem tshuaj biochemical thiab daim nyias nyias tsuas tuaj yeem txo qhov ntim, tsis yog kho cov concentrated brine nkaus xwb; Zero Discharge (ZLD) tau dhau los ua qhov yuav tsum tau ua raws li qhov yuav tsum tau ua rau kev coj noj coj ua tshiab.
MVR evaporation crystallization tam sim no yog cov cuab yeej siv hluav taws xob loj tshaj plaws hauv kev lag luam hluav taws xob tshiab rau kev kho siab - ntsev cov dej khib nyiab, ua tiav dej - ntsev sib cais, thiab ua kom muaj ntsev ntsev. Ntau qhov dej num ntsib teeb meem xws li membrane fouling, evaporator scaling, substandard ntsev khoom purity, thiab npaj txhij txog kev siv zog. Cov teeb meem no feem ntau tsis yog vim qhov tsis xws ntawm cov cuab yeej siv nws tus kheej, tab sis yog qhov tsis txaus ua ntej, kev sib txuam, thiab kev tswj xyuas kev ua haujlwm. Kab lus no tsom mus rau cov kev siv engineering, qhia txog yuav ua li cas siv cov thev naus laus zis no, txheeb xyuas qhov muaj peev xwm pitfalls, thiab yuav ua li cas zam lawv.
I. MVR Evaporation Crystallization yog dab tsi, thiab Nws daws teeb meem dab tsi nyob rau hauv Lub Zog Tshiab?
MVR sawv cev rau Mechanical Vapor Recompression Evaporation Crystallization.
Lub hauv paus ntsiab lus yooj yim: Cov kua dej pub yog rhuab thiab evaporated los tsim cov chav thib ob. Qhov thib ob chav no ces compressed los ntawm compressor, ua rau nws kub thiab siab. Nws yog tom qab ntawd rov siv dua los ua qhov cua sov rau lub evaporator, rov ua dua cov cua sov latent ntawm vaporization. Tsuas yog ib qho me me ntawm chav yuav tsum tau ua kom cov dej tsis tu ncua. Thaum cov ntsev mus txog supersaturation, nws crystallizes thiab precipitates, ua tiav kev sib cais ntawm dej thiab ntsev.
Ob Qhov Kev Thov Cuam Tshuam Hauv Cov Zog Tshiab
Kev tsim cov roj teeb: RO mloog zoo los ntawm cov tshuab dej ultrapure, electroplating wastewater concentrate, thiab txheej dej khib nyiab concentrate. Lub Hom Phiaj: Txhawm rau rov siv cov khoom siv condensate rau cov dej pleev xim hauv lub Hoobkas, thiab muag cov ntsev crystallized raws li kev lag luam los ntawm - khoom, ua tiav xoom cov dej khib nyiab tawm ntawm lub Hoobkas.
Cov theem ntub dej rov ua dua tshiab ntawm cov roj teeb hluav taws xob so haujlwm ua kom muaj -cov dej ntsev ntsev los ntawm cov txheej txheem leaching thiab extraction. Cov dej khib nyiab no muaj cov ntsiab lus ntsev ntau, qib fluoride siab, siab COD, thiab cov hlau hnyav. MVR (Mechanical Vapor Recycling) yog lub chaw kho mob zaum kawg kom tshem tawm cov dej khib nyiab thiab txo cov kev pheej hmoo ntawm ib puag ncig cuam tshuam nrog nws cov paug tawm.
Kev pom tseem ceeb: MVR yog qhov kawg - ntawm - cov cuab yeej siv yeeb nkab thiab tsis tuaj yeem muab ncaj qha rau hauv cov dej nyoos. Qhov zoo ntawm pretreatment ncaj qha txiav txim siab ua haujlwm ruaj khov ntawm tag nrho cov kab ke. Ntau qhov haujlwm ua tsis tiav yog los ntawm kev kho MVR ua "kho-tag nrho" thiab tshem tawm kev kho ua ntej.
II. Ua kom tiav thiab siv tau txoj hauv kev (Practical Flow)
Txheem engineering saw rau siab -cov dej khib nyiab los ntawm cov khoom siv hluav taws xob tshiab: Cov dej khib nyiab pretreatment → Membrane concentration unit (nanofiltration/HPRO high-density reverse osmosis) → MVR evaporation and crystallization system → Solid-kua sib cais → Condensate resource salted reuse thiab crystallization
1. Pretreatment: Ib kauj ruam tseem ceeb uas txiav txim siab lub neej ntawm cov evaporator (qhov tseem ceeb tshaj plaws) Cov kua dej nkag mus rau hauv MVR yuav tsum muaj cov khoom cuam tshuam cuam tshuam ua ntej; txwv tsis pub, scaling, corrosion, thiab substandard ntsev purity yuav tshwm sim nyob rau hauv lub tshav kub exchanger nto.
✅ Cov kab mob sib kis uas yuav tsum tau ua hauv kev ua haujlwm:
Heavy hlau ions: Tshuaj los nag yog siv. Alkali thiab sodium carbonate tau ntxiv los kho pH, ua rau cov hlau hnyav xws li npib tsib xee, cobalt, thiab manganese los ua hydroxide precipitates, uas tom qab ntawd tshem tawm los ntawm coagulation thiab nag lossis daus.
Fluoride ions: Calcium ntsev yog ntxiv rau cov calcium fluoride precipitates, uas tom qab ntawd tshem tawm.
Organic matter (COD): Rau siab -COD feed solutions, advanced oxidation processes (AOPs) (Fenton/ozone oxidation) yog siv los degrade loj molecular organic teeb meem.
Kev pheej hmoo: Cov teeb meem organic nkag mus rau hauv cov evaporator tuaj yeem ua rau foaming, pos huab nkag, blackening thiab deterioration ntawm cov khoom ntsev, thiab compressor paug.
2. Membrane Concentration Unit (Nanofiltration/High-Performance Reverse Osmosis HPRO)
Tsis txhob xa cov dej khib nyiab ncaj qha mus rau hauv MVR evaporator. Ua ntej siv cov txheej txheem membrane los ua ntej - ua kom cov dej khib nyiab, txo cov dej nkag mus rau hauv cov evaporator, txo cov peev txheej ntawm cov evaporation, thiab txuag hluav taws xob.
Nanofiltration (NF): Ua kom muaj kev sib cais ntawm cov ntsev monovalent thiab divalent, tsim cov xwm txheej rau kev sib cais ntsev tom ntej thiab crystallization.
HPRO (High-Performance Reverse Osmosis): Ntxiv concentrates cov brine, tsim cov dej tshiab rau rov siv dua thiab siab - ntsev concentrate rau xa mus rau MVR. 3. MVR Evaporation Crystallization Main Unit: Lub concentrated siab- ntsev niam cawv yog pub rau hauv MVR nws boils lub evaporator, txuas ntxiv mus rau evaporator, precipitate crystals.
Cov Lus Qhia Xaiv Cov Txheej Txheem: Txij li cov ntsev feem ntau yog sodium chloride thiab sodium sulfate, qhov yuam kev ncig evaporation crystallizer yog nyiam. Qhov no haum rau siab - ntsev, yooj yim scaling tej yam kev mob, thiab yog siv nyob rau hauv feem ntau ntawm tej yaam num nyob rau hauv lub tshiab zog kev lag luam.
Tsis txhob siv cov evaporator ntog los kho cov khoom siv siab - ntsev crystalline. Poob zaj duab xis evaporators yog haum rau concentration thiab tsis rau loj - nplai crystallization.
4. Khoom-Kua sib cais thiab xa tawm-Kev kho mob: Lub crystallized ncua kev kawm ntawv yog tawm mus rau lub centrifuge kom tiav cov khoom sib cais- kua sib cais.
Khoom Crystallized Salt: Tom qab ziab, yog tias qhov purity ua tau raws li cov qauv, nws raug muag raws li cov ntsev; yog tias impurities tshaj li cov qauv, nws yuav muab pov tseg raws li cov khoom pov tseg.
Niam cawv: Niam cawv los ntawm lub centrifuge raug xa rov qab mus rau lub evaporation system kom txuas ntxiv mus.
Evaporation Condensate: Cov dej zoo nyob ze rau cov dej distilled thiab tuaj yeem rov qab siv tau raws li RO pub dej thiab ncig cov dej txias pleev cov dej kom ua tiav qhov kaw - voj voog dej.
III. Cov Txheej Txheem Tseem Ceeb rau Kev Siv Hluav Taws Xob (Nyeem rau Kev Siv)
Pub COD: Tsawg, feem ntau qis dua 500-1000 mg / L nyob ntawm seb hom ntsev. Cov organic ntau dhau tuaj yeem ua rau foaming, entrainment, thiab ntsev discoloration.
Pub Fluoride Ions: Tsawg kawg rau 10 mg / L. Fluoride tuaj yeem ua rau cov khoom siv corrosion thiab tsim cov nplai insoluble.
Pub Heavy Metals: Txo kom ze rau qhov kev kuaj pom. Heavy hlau residues thiab crystalline ntsev yuav raug cais raws li cov pov tseg txaus ntshai thiab tsis tuaj yeem rov ua dua.
Kev khiav hauj lwm pH: Kho raws li cov ntaub ntawv. Acid ib puag ncig nce corrosion; Feem ntau, kev hloov kho me ntsis alkali raug pom zoo.
Membrane Concentration Ratio: Xav txog ntsev solubility kom tsis txhob muaj crystallization ntxov ntxov ntawm daim nyias nyias. Tshaj -kev sib xyaw ua ke yuav ncaj qha ua rau qhov ntsuas tsis tau rov qab thiab ua rau cov khoom siv membrane siv tsis tau.
Lus Cim: Cov dej khib nyiab los ntawm lub hwj chim roj teeb rov ua dua tshiab hloov pauv tau zoo heev. Tej yaam num tiag tiag yuav tsum muaj me me - nplai thiab pilot- ntsuas ntsuas los txiav txim cov yam ntxwv ntawm cov khoom; Cov tsis muaj tam sim no los ntawm kev lag luam tshuaj tsis tuaj yeem siv ncaj qha.
IV. Siab -Feem ntau qhov ua txhaum, ua rau, thiab kev daws teeb meem hauv Txoj Haujlwm Tshiab Zog
Fault 1: Kev ntsuas nrawm nrawm ntawm cov evaporator tshav kub pauv qhov chaw, ua rau txo qis kev sib pauv hluav taws xob thiab kev ua haujlwm luv luv.
Ua rau: Kev kho tsis zoo ua ntej; calcium thiab magnesium hardness, fluoride ions, thiab silicon tsis raug tshem tawm; Kev tswj qhov kub tsis raug ua haujlwm ua rau thaj chaw oversaturation thiab scaling.
✅ Cov kev daws teeb meem:
Nruab softening thiab chemical nag lossis daus chav nyob rau pem hauv ntej kawg kom nruj nreem tshem tawm hardness thiab fluoride;
Ua cov tshuaj ntxuav hauv online tsis tu ncua thiab nruab CIP tu module;
Tswj cov kev khiav dej num kom tsim nyog los txo qis hauv zos oversaturation ntawm phab ntsa.
Qhov txhaum 2: Cov kua ntsev ua kua qaub yog xim dub thiab tsis ua raws li cov qauv purity, yuav tsum muaj pov tseg pov tseg thiab ua rau cov txiaj ntsig rov qab poob.
Ua rau: tshem tawm tsis tiav ntawm cov organic teeb meem ntawm cov dej khib nyiab; huab cua nqa cov organic impurities rau hauv cov ntsev crystalline; Kev tshem tawm tsis tiav ntawm cov hlau hnyav.
✅ Cov kev daws teeb meem:
Ua ntej- kev kho mob nrog oxidation siab heev kom degrade COD yog qhov tseem ceeb;
Txhim kho lub evaporator nrog lub demister kom txo cov huab cua nkag;
nruj me ntsis tswj qhov hnyav hlau tshem tawm cov nyhuv ntawm cov nag lossis daus chav tsev.
Fault 3: Kev siv hluav taws xob ntau tshaj tus nqi tsim, ua rau cov nqi khiav lag luam siab.
Ua rau: Tsis muaj pem hauv ntej- kawg membrane concentration, ua rau ntau qhov tsawg ntawm - cov dej khib nyiab ncaj qha nkag mus rau hauv evaporator; qhov system xau thiab drips, ua rau lub tshuab nqus tsev tsis zoo.
✅ Cov kev daws teeb meem:
Ua raws li kev sib xyaw ua ke ntawm "membrane concentration thiab ntim txo + MVR crystallization" kom txo qhov ntim ntawm evaporation;
Tsis tu ncua tshuaj xyuas thiab tswj lub tshuab nqus tsev thiab compressor kev ua haujlwm;
Condensate cua sov tuaj yeem rov ua dua kom preheat qhov pub rau pem hauv ntej kawg.
Fault 4: Niam cawv tsis tu ncua khaws cov impurities, tiv thaiv ntev - lub sijhawm ua haujlwm ruaj khov.
Ua rau: impurities tsis tu ncua nyob rau hauv niam cawv, tsis muaj bypass rau leej niam cawv.
✅ Cov kev daws teeb meem: teeb tsa tus niam dej cawv tso tawm ib ntus kom tso tawm ib feem ntawm niam cawv ntxiv nrog cov impurities, tiv thaiv tsis pub muaj impurity tsub zuj zuj.
V. Kev txwv: MVR tsis yog panacea; nws cov kev txwv yuav tsum tau nkag siab ua ntej
Kev nqis peev siab thiab cov nqi khiav lag luam: Cov khoom siv siab yuav nqi, feem ntau siv hluav taws xob. Ua ntej ua ntej- cov txheej txheem ntawm daim nyias nyias kom ua kom lub ntim txo qis, txo qis evaporation nplai, thiab tswj cov nqi tag nrho.
rhiab heev rau kev hloov pauv hauv cov dej zoo: roj teeb rov ua dej khib nyiab zoo hloov pauv tau zoo heev, xav tau kev teeb tsa ntawm lub tank homogenization kom ruaj khov cov dej zoo; txwv tsis pub, lub kaw lus kev ua haujlwm yuav hloov pauv loj heev.
Kev siv cov ntsev ntsev tsis yog qhov txiaj ntsig tau lees paub: Tsuas yog nrog kev kho kom zoo thiab ua tau raws li cov qauv purity tuaj yeem siv ntsev los ua cov khoom lag luam; yog tias impurities tshaj cov qauv, cov ntsev uas tsim tawm tseem muaj cov khib nyiab pov tseg thiab yuav tsum tau them nyiaj pov tseg.
Kev xaiv cov khoom tseem ceeb heev: Cov pa roj carbon steel tsis tsim nyog rau chloride -muaj cov brine; titanium lossis duplex stainless hlau yuav tsum tau siv los tiv thaiv pitting corrosion. Kev xaiv cov khoom siv yuav tsum yog raws li kev ntsuas dav dav ntawm cov dej zoo.
VI. Cov lus pom zoo rau kev siv (rau cov txheej txheem thiab ib puag ncig engineers)
Pib nrog - ntsuas me me, tom qab ntawd sim ntsuas - ntsuas ntsuas, thiab thaum kawg ntsuas kom puv - teev ua haujlwm. Tshiab lub zog khib nyiab muaj pes tsawg leeg yog complex thiab sib txawv; tsis txhob siv cov parameter ncaj qha los ntawm lwm cov kev lag luam. Ua cov kev ntsuam xyuas ua ntej kom paub meej tias cov kev xav tau ntawm kev ntsuas thiab cov ntsev ntau lawm.
Ua ntej qhov pretreatment unit hauv koj cov peev nyiaj. Ntau qhov haujlwm tau txiav rov qab rau kev nqis peev ua ntej, ua rau MVR tsis ua haujlwm tom qab, uas ua rau muaj kev nce ntxiv hauv kev ua haujlwm thiab kev saib xyuas tag nrho.
Tsim kom muaj lub suab tswj kev ua haujlwm: tsis tu ncua saib xyuas cov khoom noj COD, fluoride, hardness, thiab hnyav hlau; tsim kom muaj CIP tu lub voj voog; thiab tswj cov teeb meem kev haus cawv rau niam.
Tsim cov phiaj xwm xwm txheej: Yog tias qhov zoo ntawm cov ntsev crystallized tsis tau raws li cov qauv kev lag luam ntsev, npaj ua ntej rau kev pov tseg pov tseg kom tsis txhob muaj qhov tsis muaj kev pov tseg tom qab qhov project tiav.
Xaus
MVR evaporation crystallization yog cov thev naus laus zis thev naus laus zis rau kev ua tiav xoom tso tawm ntawm siab- cov dej qab ntsev hauv kev lag luam hluav taws xob tshiab, tab sis nws yog cov txheej txheem uas yog "pem hauv ntej- kawg- hnyav thiab ua haujlwm- tu- siv zog. Qhov kev sib tw tiag tiag tsis yog nyob rau hauv cov khoom siv evaporation nws tus kheej, tab sis nyob rau hauv dej khib nyiab pretreatment, dej zoo homogenization tswj, thiab refined tswj kev khiav hauj lwm tsis.
Tsuas yog los ntawm kev sib koom ua ke tag nrho cov saw hlau ntawm "pretreatment - membrane concentration - MVR crystallization - solid-kua sib cais - cov khoom pov tseg" tuaj yeem muaj tseeb xoom dej pov tseg thiab kev siv ntsev ntsev ua tiav, ua tau raws li ib puag ncig kev ua raws cai thiab ntsuab cov hom phiaj ntawm kev tsim hluav taws xob tshiab thiab roj teeb recycl.