Test Report
Hauv kev kho dej khib nyiab, cov txheej txheem aeration suav txog 45% mus rau 75% ntawm kev siv lub zog ntawm tag nrho cov dej khib nyiab kho, txhawm rau txhim kho cov pa oxygen hloov pauv ntawm cov txheej txheem aeration, cov nroj tsuag dej khib nyiab tam sim no feem ntau siv hauv microporous. Piv nrog rau aeration system ntawm cov npuas loj thiab nruab nrab, lub microporous aeration system tuaj yeem txuag tau li 50% ntawm kev siv hluav taws xob. Txawm li cas los xij, kev siv cov pa oxygen ntawm nws cov txheej txheem aeration kuj yog nyob rau hauv thaj tsam ntawm 20% mus rau 30%. Tsis tas li ntawd, muaj ntau qhov chaw hauv Suav teb siv cov tshuab microporous aeration rau kev kho cov dej qias neeg, tab sis tsis muaj kev tshawb fawb txog kev xaiv cov microporous aerators rau cov dej sib txawv. Yog li ntawd, kev ua kom zoo ntawm microporous aerator oxygenation kev ua haujlwm tsis zoo rau kev tsim khoom thiab kev siv tiag tiag yog qhov tseem ceeb heev.
Muaj ntau yam cuam tshuam rau kev ua haujlwm ntawm microporous aeration thiab oxygenation, qhov tseem ceeb tshaj plaws yog qhov ntim aeration, pore loj thiab kev teeb tsa ntawm cov dej tob.
Tam sim no, muaj tsawg dua kev tshawb fawb txog kev sib raug zoo ntawm cov pa oxygenation ntawm microporous aerator thiab qhov pore loj thiab qhov tob ntawm kev teeb tsa hauv tsev thiab txawv teb chaws. Kev tshawb fawb tsom ntau ntxiv rau kev txhim kho tag nrho cov pa oxygen loj hloov coefficient thiab oxygenation peev xwm, thiab tsis quav ntsej txog qhov teeb meem siv hluav taws xob hauv cov txheej txheem aeration. Peb coj lub theoretical zog efficiency raws li lub ntsiab kev tshawb fawb Performance index, ua ke nrog lub oxygenation muaj peev xwm thiab cov qauv ntawm oxygen siv, pib optimize lub aeration ntim, aperture txoj kab uas hla thiab installation qhov tob thaum lub aeration efficiency yog siab tshaj, muab ib tug siv rau daim ntawv thov. ntawm microporous aeration technology hauv qhov project tiag.
1. Cov khoom siv thiab cov txheej txheem
1.1 Kev ntsuam xyuas
Qhov kev sim teeb tsa tau ua los ntawm Plexiglas, thiab lub cev tseem ceeb yog D {{{0}}}.4 m × 2 m cylindrical aeration tank nrog cov pa oxygen yaj nyob rau hauv 0.5 m hauv qab dej saum npoo av (daim duab 1. ).
Daim duab 1 Aeration thiab Oxygenation Test teeb
1.2 Cov ntaub ntawv xeem
Microporous aerator, ua los ntawm roj hmab membrane, txoj kab uas hla 215 mm, pore loj 50, 100, 200, 500, 1 000 μm. sension378 benchtop dissolved oxygen tester, HACH, USA. Gas rotor flow meter, thaj tsam 0 ~ 3 m3 / h, qhov tseeb ± 0.2%. HC-S tshuab blower. Catalyst: CoCl2-6H2O, analytically ntshiab; Deoxidant: Na2SO3, tsom xam ntshiab.
1.3 Test method
Qhov kev sim tau ua los ntawm kev siv cov txheej txheem tsis nyob ruaj khov, piv txwv li, Na2SO3 thiab CoCl2-6H2O tau txhaj tshuaj thawj zaug rau deoxygenation thaum lub sijhawm kuaj, thiab aeration tau pib thaum cov pa oxygen hauv dej tau txo mus rau {{5} }. Cov kev hloov pauv hauv cov pa oxygen hauv cov dej hauv lub sijhawm tau sau tseg, thiab tus nqi KLa raug xam. Oxygenation kev ua tau zoo tau sim nyob rau hauv ntau qhov sib txawv aeration (0.5, 1, 1.5, 2, 2.5, 3 m3 / h), qhov sib txawv qhov pore (50, 100, 200, 500, 1, 000 μm), thiab sib txawv dej tob (0.8, 1.1, 1.3, 1.5, 1.8, 2.0 m), thiab siv tau los ntawm CJ / T
3015.2 -1993 "Aerator clear water oxygenation performance determination" and the United States of America clear water oxygenation test standards.
2. Cov txiaj ntsig thiab kev sib tham
2.1 Cov ntsiab lus ntawm kev xeem
Lub hauv paus ntsiab lus ntawm qhov kev ntsuam xyuas yog ua raws li qhov kev xav ntawm ob lub membrane txoj kev xav tau los ntawm Whitman hauv xyoo 1923. Cov txheej txheem ntawm cov pa oxygen loj tuaj yeem qhia hauv qhov sib npaug (1).
Qhov twg: dc/dt - huab hwm coj hloov pauv tus nqi, piv txwv li, tus nqi ntawm cov pa xa mus rau ib chav tsev ntim dej hauv ib lub sijhawm, mg / (Ls).
KLa - tag nrho cov pa oxygen hloov coefficient ntawm lub aerator ntawm qhov kev xeem, min-1 ;
C * - saturated yaj oxygen hauv dej, mg / L.
Ct - yaj oxygen hauv dej thaum lub sijhawm aeration t, mg / L.
Yog tias qhov ntsuas kub tsis nyob ntawm 20 degree, qhov sib npaug (2) tuaj yeem siv los kho KLa:
Lub peev xwm oxygenation (OC, kg / h) qhia los ntawm kev sib npaug (3).
Qhov twg: V - aeration pas dej ua ke, m3.
Kev siv cov pa oxygen (SOTE, %) yog qhia los ntawm kev sib npaug (4).
Qhov twg: q - aeration ntim nyob rau hauv tus qauv mob, m3 / h.
Theoretical zog efficiency [E, kg/(kW-h)] yog qhia los ntawm kab zauv (5).
Qhov twg: P - aeration khoom fais fab, kW.
Feem ntau siv cov ntsuas ntsuas rau kev ntsuas lub aerator oxygenation kev ua tau zoo yog tag nrho cov pa oxygen loj hloov coefficient KLa, oxygenation peev OC, oxygen siv tus nqi SOTE thiab theoretical zog efficiency E [7]. Cov kev tshawb fawb uas twb muaj lawm tau tsom ntau dua ntawm cov qauv ntawm tag nrho cov pa oxygen loj hloov coefficient, oxygenation peev xwm thiab kev siv cov pa oxygen, thiab tsawg dua ntawm kev siv hluav taws xob theoretical [8, 9]. Theoretical zog efficiency, raws li qhov tsuas efficiency Performance index [10], muaj peev xwm xav txog lub zog noj teeb meem nyob rau hauv lub aeration txheej txheem, uas yog lub hom phiaj ntawm qhov kev sim no.
2.2 Cov txiaj ntsig ntawm aeration ntawm kev ua haujlwm oxygenation
Cov pa oxygenation kev ua tau zoo ntawm cov qib aeration sib txawv tau ntsuas los ntawm aeration hauv qab 2 m ntawm lub aerator nrog lub pore loj ntawm 200 μm, thiab cov txiaj ntsig tau pom hauv daim duab 2.
Fig. 2 Kev hloov pauv ntawm K thiab kev siv oxygen nrog tus nqi aeration
Raws li pom tau los ntawm daim duab 2, KLa nce maj mam nrog qhov nce ntawm qhov ntim aeration. Qhov no feem ntau yog vim qhov loj ntawm qhov ntim aeration, qhov loj dua qhov chaw sib cuag roj-kua thiab ntau dua cov pa oxygenation efficiency. Ntawm qhov tod tes, qee cov kws tshawb nrhiav pom tias qhov kev siv cov pa oxygen txo qis nrog qhov nce ntawm qhov ntim aeration, thiab qhov xwm txheej zoo sib xws tau pom hauv qhov kev sim no. Qhov no yog vim hais tias nyob rau hauv ib tug tej yam dej qhov tob, lub sij hawm nyob ntawm cov npuas nyob rau hauv cov dej yog nce thaum lub aeration ntim yog me me, thiab cov roj-kua sib cuag lub sij hawm ntev; Thaum lub aeration ntim loj, qhov cuam tshuam ntawm lub cev dej muaj zog, thiab feem ntau ntawm cov pa oxygen tsis zoo siv, thiab nws thiaj li tso tawm los ntawm cov dej hauv daim ntawv ntawm npuas rau hauv huab cua. Kev siv cov pa oxygen los ntawm qhov kev sim no tsis siab piv rau cov ntaub ntawv, tej zaum vim tias qhov siab ntawm lub reactor tsis siab txaus, thiab cov pa ntau ntawm cov pa tawm mus yam tsis muaj kev sib cuag nrog cov kab dej, txo qhov kev siv cov pa oxygen.
Qhov txawv ntawm theoretical zog efficiency (E) nrog aeration yog qhia nyob rau hauv daim duab 3.
Daim duab 3 Theoretical zog efficiency piv rau aeration ntim
Raws li tuaj yeem pom hauv daim duab 3, qhov theoretical zog efficiency txo qis nrog nce aeration. Qhov no yog vim hais tias tus qauv oxygen hloov tus nqi nce nrog qhov nce ntawm qhov ntim ntawm aeration nyob rau hauv qee qhov dej tob, tab sis qhov nce hauv kev ua haujlwm tseem ceeb ntawm lub tshuab nqus tsev yog qhov tseem ceeb tshaj qhov nce ntawm tus qauv oxygen hloov pauv, yog li theoretical zog efficiency. txo nrog qhov nce ntawm aeration ntim nyob rau hauv qhov ntau ntawm aeration ntim tshuaj xyuas hauv qhov kev sim. Combining cov tiam sis nyob rau hauv Fig. 2 thiab 3, nws tuaj yeem pom tias qhov ua tau zoo tshaj plaws ntawm cov pa oxygenation yog ua tiav ntawm qhov ntim aeration ntawm 0.5 m3 / h.
2.3 Cov txiaj ntsig ntawm qhov pore loj ntawm kev ua haujlwm oxygenation
Pore loj muaj qhov cuam tshuam zoo rau kev tsim cov npuas, qhov loj dua qhov pore loj, qhov loj ntawm cov npuas. Cov npuas ntawm cov pa oxygenation kev ua tau zoo ntawm qhov cuam tshuam yog tshwm sim nyob rau hauv ob yam: Ua ntej, qhov me me ntawm tus kheej npuas, qhov loj ntawm tag nrho cov npuas tshwj xeeb ntawm thaj chaw, qhov loj dua qhov loj ntawm cov pa-kua huab cua hloov chaw, qhov zoo dua rau kev hloov ntawm oxygen; Qhov thib ob, cov npuas loj dua, lub luag haujlwm ntawm kev sib xyaw ua ke ntawm cov dej muaj zog, cov roj-kua sib xyaw ntawm qhov nrawm dua, cov txiaj ntsig zoo ntawm oxygenation. Feem ntau thawj qhov taw tes hauv kev hloov pauv huab hwm coj ua lub luag haujlwm tseem ceeb. Qhov kev sim yuav yog aeration ntim tau teem rau 0.5 m3 / h, txhawm rau tshuaj xyuas cov txiaj ntsig ntawm qhov pore loj ntawm KLa thiab kev siv oxygen, saib daim duab 4.
Fig. 4 Variation curves of KLa and oxygen use with pore size
Raws li pom tau los ntawm daim duab 4, ob qho tib si KLa thiab kev siv cov pa oxygen poob qis nrog qhov nce ntawm qhov pore loj. Raws li qhov xwm txheej ntawm tib qhov dej tob thiab qhov ntim aeration, KLa ntawm 50 μm aperture aerator yog li peb zaug ntawm 1, 000 μm aperture aerator. Yog li ntawd, thaum lub aerator raug ntsia rau hauv ib qho tob ntawm dej, qhov me me ntawm lub aperture ntawm lub aerator oxygenation muaj peev xwm thiab kev siv oxygen ntau dua.
Qhov txawv ntawm theoretical zog efficiency nrog pore loj yog qhia nyob rau hauv daim duab 5.
Daim duab 5 Theoretical zog efficiency vs. pore loj
Raws li tuaj yeem pom los ntawm daim duab 5, qhov theoretical zog efficiency qhia tau hais tias ib qho kev nce thiab tom qab ntawd txo qis nrog qhov nce ntawm qhov aperture loj. Qhov no yog vim hais tias ntawm ib sab, lub me aperture aerator muaj ib tug loj KLa thiab oxygenation muaj peev xwm, uas yog conducive rau oxygenation. Ntawm qhov tod tes, qhov tsis kam tiv thaiv nyob rau hauv qee qhov dej tob nce nrog qhov txo qis ntawm aperture txoj kab uas hla. Thaum qhov pore loj txo ntawm qhov tsis kam ntawm qhov kev txhawb nqa muaj zog ntau dua li lub luag haujlwm ntawm cov pa oxygen loj, qhov theoretical zog efficiency yuav raug txo nrog txo qhov pore loj. Yog li ntawd, thaum lub aperture txoj kab uas hla me me, lub theoretical zog efficiency yuav nce nrog rau qhov nce ntawm aperture txoj kab uas hla, thiab lub aperture txoj kab uas hla ntawm 200 μm mus txog qhov siab tshaj plaws tus nqi ntawm 1.91 kg / (kW-h); Thaum lub aperture txoj kab uas hla> 200 μm, qhov kev tiv thaiv poob hauv cov txheej txheem aeration tsis ua lub luag haujlwm tseem ceeb hauv cov txheej txheem aeration, KLa thiab lub peev xwm oxygenation nrog qhov nce hauv aperture txoj kab uas hla ntawm lub aerator yuav raug txo, thiab yog li ntawd, theoretical. zog efficiency qhia tau hais tias ib tug tseem ceeb downward trend.
2.4 Qhov cuam tshuam ntawm kev teeb tsa dej tob ntawm kev ua haujlwm oxygenation
Qhov tob ntawm cov dej nyob rau hauv uas lub aerator yog ntsia muaj ib tug tseem ceeb heev rau lub aeration thiab oxygenation nyhuv. Lub hom phiaj ntawm kev sim kawm yog ib qho dej ntiav ntawm qhov tsawg dua 2 m. Lub aeration qhov tob ntawm lub aerator tau txiav txim siab los ntawm cov dej tob ntawm lub pas dej. Cov kev tshawb fawb uas twb muaj lawm feem ntau tsom mus rau qhov tob tob ntawm lub aerator (piv txwv li, lub aerator tau nruab rau hauv qab ntawm lub pas dej, thiab cov dej qhov tob yog nce los ntawm kev nce cov dej), thiab qhov kev ntsuam xyuas feem ntau yog tsom rau qhov tob ntawm lub installation. aerator (piv txwv li, tus nqi ntawm cov dej hauv lub pas dej ua ke yog khaws cia tas li, thiab qhov siab ntawm lub tshuab aerator tau hloov kho kom pom qhov tob zoo tshaj plaws ntawm cov dej rau cov nyhuv aeration), thiab cov kev hloov ntawm KLa thiab oxygen. kev siv nrog qhov tob ntawm dej yog qhia hauv daim duab 6.
Daim duab 6 Kev hloov pauv ntawm K thiab kev siv oxygen nrog dej tob
Daim duab 6 qhia tau hais tias nrog kev nce ntawm cov dej qhov tob, KLa thiab kev siv cov pa oxygen qhia tau tias muaj kev nce ntxiv, nrog KLa txawv ntawm ntau tshaj plaub zaug ntawm 0.8 m dej tob thiab 2 m dej tob. Qhov no yog vim qhov tob hauv dej, lub sij hawm nyob ntev ntawm cov npuas hauv cov dej, lub sij hawm ntev ntawm cov roj-kua sib cuag, qhov zoo dua cov pa oxygen. Yog li ntawd, qhov tob ntawm lub aerator yog ntsia, qhov ntau conducive rau lub peev xwm ntawm oxygenation thiab oxygen siv. Tab sis lub installation ntawm dej tob nce nyob rau tib lub sij hawm kuj tsis kam kuj yuav nce, thiaj li yuav kov yeej qhov kev tiv thaiv poob, nws yog ib qhov tsim nyog los nce tus nqi ntawm aeration, uas yuav inevitably ua rau ib tug nce nyob rau hauv lub zog noj thiab kev khiav hauj lwm nqi. Yog li ntawd, txhawm rau kom tau txais qhov zoo tshaj plaws installation qhov tob, nws yog ib qho tsim nyog los ntsuas qhov kev sib raug zoo ntawm theoretical zog efficiency thiab dej tob, saib Table 1.
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Table 1 Theoretical zog efficiency raws li ib tug muaj nuj nqi ntawm dej tob |
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Qhov tob / m |
E/(kg.kw-1.h-1) |
Qhov tob / m |
E/(kg.kw-1.h-1) |
|
0.8 |
0.50 |
1.1 |
1.10 |
Table 1 qhia tau hais tias qhov theoretical zog efficiency yog tsawg heev ntawm ib tug installation qhov tob ntawm 0.8 m, nrog tsuas yog 0.5 kg/(kW-h), ua dej ntiav aeration tsis tsim nyog. Kev txhim kho ntawm cov dej tob ntawm 1.1 ~ 1.5 m ntau, vim qhov muaj peev xwm nce ntxiv ntawm cov pa oxygenation, thaum lub aerator los ntawm cov nyhuv kuj tsis pom tseeb, yog li qhov theoretical zog efficiency nce sai. Raws li cov dej qhov tob nce ntxiv mus rau 1.8 m, cov nyhuv ntawm kev tsis kam ntawm cov pa oxygenation ua tau zoo dua thiab tseem ceeb dua, uas ua rau kev loj hlob ntawm kev siv hluav taws xob theoretical zoo li qub, tab sis tseem qhia tau tias muaj kev nce ntxiv, thiab hauv kev teeb tsa. ntawm cov dej tob ntawm 2 m, theoretical zog efficiency nce mus txog qhov siab tshaj plaws ntawm 1.97 kg / (kW-h). Yog li ntawd, rau cov channel <2 m, hauv qab aeration yog nyiam rau kev pom cov pa oxygenation.
Xaus
Siv txoj kev zoo li qub uas tsis nyob ruaj khov rau microporous aeration ntshiab dej oxygenation kuaj, hauv qhov ntsuas dej tob (< 2 m) and pore size (50 ~ 1 000 μm) conditions, the total oxygen mass transfer coefficient KLa and oxygen utilisation increased with the installation of the water depth; with the increase in pore size and decreased. In the process of increasing the aeration volume from 0.5 m3/h to 3 m3/h, the total oxygen mass transfer coefficient and oxygenation capacity gradually increased, and the oxygen utilisation rate decreased.
Theoretical zog efficiency yog qhov qhia txog kev ua tau zoo. Nyob rau hauv qhov kev xeem, lub theoretical zog efficiency nrog lub aeration thiab installation ntawm dej tob nce, nrog rau qhov nce nyob rau hauv aperture thawj zaug nce thiab ces txo. Kev txhim kho ntawm cov dej tob thiab aperture yuav tsum yog qhov tsim nyog ua ke txhawm rau txhawm rau ua kom cov pa oxygenation ua tiav qhov zoo tshaj plaws, feem ntau, qhov ntau dua qhov tob ntawm cov dej xaiv ntawm aerator aperture qhov loj dua.
Cov txiaj ntsig kev sim qhia tau hais tias yuav tsum tsis txhob siv cov dej ntiav ntiav. Nyob rau ntawm qhov tob ntawm 2 m, lub aeration ntim ntawm 0.5 m3 / h thiab aerator nrog lub pore loj ntawm 200 μm ua rau lub siab tshaj plaws theoretical zog efficiency ntawm 1.97 kg / (kW-h).
