Rau Titanium Tube Bundle rhaub hauv 15% Aluminium Sulfate (Alum) Kev daws ntawm 70 degree, Dab tsi yog qhov tseem ceeb ntawm Aluminium Hydroxide Scale Thickness uas ua rau 50% txo cov cua sov ua haujlwm?
Tso lus
Aluminium hydroxide (Al (OH) 3) scale tsim rau rhuab titanium nto nyob rau hauv 15% txhuas sulfate (alum) ntawm 70 degree. Cov nplai muaj qhov tsis zoo thermal conductivity ntawm 0.2-0.4 W / m·K piv rau 21.9 W / m·K rau titanium. Ib qho tseem ceeb scale thickness ntawm 0.5 hli ua 50% tsawg dua tshav kub hloov efficiency, uas txhais tau tias ob npaug rau lub sij hawm cua sov los yog lub hwj chim siv rau ncav cuag tib txheej txheem kub. Cov nplai yog tsim los ntawm hydrolysis ntawm aluminium ions: Al 3+ + 3H 2 O Al(OH) 3 + 3H +. Cov nag lossis daus nce nrog qhov kub thiab txias ntawm aluminium concentration.
Mechanism of Heat Transfer Reduction los ntawm Aluminium Hydroxide Scale
Qhov tsis kam ntawm titanium phab ntsa suav nrog cov thermal kuj ntawm cov nplai. Qhov kub sib txawv tag nrho yog $\\Delta T_{tag nrho}=\\Delta T_{titanium} + \\Delta T_{scale}$. Qhov ntsuas thickness nce $\\Delta T_{tag nrho}$ nyob rau hauv kev faib ua feem rau ib tug muab kub flux. Yog li tag nrho qhov ntsuas kub txo yog ob npaug thiab qhov hloov pauv cua sov yog halved. Qhov ntsuas tuab yog 0.5 hli, xws li ΔT_scale yog kwv yees li ΔT_titanium. Lub nplai kuj nce qhov kub thiab txias ntawm lub raj, uas ua rau cov dej nag tom ntej.
Kev txo qis ntawm kev hloov hluav taws xob raws li kev ua haujlwm ntawm thickness ntawm nplai
Kev ntsuam xyuas ntawm 20 W / cm² kub flux nyob rau hauv 15% Al₂(SO₄)₃ ntawm 70℃tau pom cov nram qab no txo cov cua sov hloov rau Qib 2 titanium . 0 hli scale thickness (huv) ntxiv thermal kuj yog 0, tshav kub hloov pauv yog 0, lub zog yuav tsum tau nce yog 1.0 ×. Qhov ntxiv kuj yog 0.00025-0.0005 m2K / W (txo 10-20%, lub zog nce 1.1-1.25 ×) ntawm 0.1mm thickness. Resistance ntawm 0.2 hli 0.0005-0.001, txo 20-35%, lub zog nce 1.25-1.5x Resistance, 0.3 mm, 0.00075-0.0015, txo, 30-50%, zog nce, 1.4-2.0x. Tseem ceeb thickness ntawm 0.5 hli, tsis kam 0.00125–0.0025, txo 45–65%, zog nce 1.8–2.8 ×. Rau 1.0 hli: tsis kam 0.0025-0.005, txo 65-85%, lub zog nce 2.8-6.5x.
Kev loj hlob tus nqi ntawm qhov ntsuas lub sijhawm
Qhov nce ntawm qhov ntsuas tuab nrog lub sijhawm ua raws li txoj cai parabolic. Scale thickness ntawm 100 teev yog 0.05-0.10 hli, kub hloov pauv yog 5-15%. Thaum 500 teev, thickness yog 0.15-0.30 hli, txo yog 20-45%. Ntawm 1,000 teev thickness yog 0.25-0.50 hli thiab txo yog 35-65%. Thickness (0.40 txog 0.80 hli) thiab txo qis (50 mus rau 80%) ntawm 2000 teev. Kev loj hlob tus nqi txo nrog lub sij hawm, txij li cov nplai txheej ua raws li qhov cuam tshuam rau cov khoom siv txhuas ions.
Aluminium Sulfate Boiler Scale Control thiab Ntxuav Phau Ntawv Qhia
Cov lus hauv qab no qhia txog qhov siab tshaj plaws uas tso cai teev tuab thiab tu zaus rau Qib 2 titanium raj bundle rhaub hauv 15% txhuas sulfate ntawm 70 degree.
Scale Thickness (mm) Txo cov cua sov hloov mus (%) Pom zoo ua kom huv huv txoj kev ntxuav zaus<0.1 <15 None N/A Annual 0.1-0.2 15-30 Performance monitoring Quarterly Inspection N/A
0.2–0.3 30–50 Schedule cleaning 5% HCl, 50°C, 30 min Monthly 0.3–0.5 50–65 Clean immediately 5% HCl, 50°C, 60 min Biweekly >0.5 >65 Tseem Ceeb - ceev ceev tu Mechanical + acid Txhua lub limtiam Engineering Tshaj Scale Thickness Control
Kev txhim kho nplai tsis cuam tshuam los ntawm qib ntawm titanium txawm tias Qib 7 muaj kev tiv thaiv corrosion ntau dua nyob rau hauv nplai. Phab ntsa tuab tso cai rau cov cua sov hloov mus. Lub phab ntsa tuab muaj qhov loj dua hauv paus ΔT, yog li qhov feem pua txo qis rau qhov muab teev tuab me ntsis. Cov nplai adhesion yog kev ua haujlwm ntawm lub raj nplaim tiav thiab electropolished nto (Ra <0.3 µm) yooj yim rau descale. Cov ntsiab lus ntawm txhuas sulfate yuav tsum tau khaws cia hauv qab 15% kom txo qhov kev loj hlob ntawm cov nplai. Polyacrylic acid raws li cov nplai inhibitor ntawm 10 ppm yog txo qhov tsim los ntawm 30-50%.
Specification los ntawm kev paub
Rau lub titanium raj bundle rhaub nyob rau hauv 15% txhuas sulfate thiab 70 degree, ntxuav lub rhaub thaum lub scale thickness ncav cuag 0.3 hli los tiv thaiv qhov txo ntawm tshav kub hloov dua siab tshiab 50%. Al (OH) 3 nplai raug tawm tsam nrog 5% hydrochloric acid ntawm 50℃rau 30-60 min thiab yaug kom huv si nrog dej. Txhim kho qhov ntsuas qhov sib txawv ntawm lub tshuab cua sov kom pom qhov 20% siab poob nce vim qhov ntsuas qhov ntsuas - nce yuav tsum tau ntxuav. Ntxuav txhua 500 mus rau 1,000 teev rau kev pabcuam tsis tu ncua. Hauv kev pabcuam txhuas sulfate tus kws ua haujlwm khaws cov nplai tuab hauv qab 0.5 hli kom tswj tau cov cua sov ua haujlwm siab tshaj 50%.
