impact of interruption of antiscalant dosing or cleaning balls ...
impact of interruption of antiscalant dosing or cleaning balls ...
impact of interruption of antiscalant dosing or cleaning balls ...
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No Ball Cleaning<br />
Fouling Fact<strong>or</strong>, m 2 K /kW<br />
0.35<br />
Ball Cleaning<br />
0.3<br />
No-Ball Cleaning<br />
Resumed<br />
0.25<br />
FF Design = 0.215<br />
0.2<br />
0.15<br />
0.1<br />
0.05<br />
0<br />
0 40 80 120 160 200 240 280 320 360 400<br />
Hours<br />
Figure 5. Balls <strong>cleaning</strong> <strong>interruption</strong> with dose rate <strong>of</strong> 1.0 ppm<br />
<strong>of</strong> phosphonate based <strong>antiscalant</strong> at TBT <strong>of</strong> 90 o C<br />
0.15<br />
0.125<br />
Fouling Fact<strong>or</strong>,<br />
m2K/kW<br />
0.1<br />
0.075<br />
0.05<br />
0.025<br />
No-Ball Cleaning<br />
Ball Cleaning<br />
Resumed<br />
0<br />
0 50 100 150 200 250 300 350 400 450<br />
5<br />
Overall Heat Transfer<br />
Coefficient, kW /m2K<br />
4.75<br />
4.5<br />
4.25<br />
4<br />
3.75<br />
3.5<br />
3.25<br />
3<br />
No-Ball Cleaning<br />
0 50 100 150 200 250 300 350 400 450<br />
Time (hours)<br />
Ball Cleaning<br />
Resumed<br />
Figure 6. Balls <strong>cleaning</strong> <strong>interruption</strong> with dose rate <strong>of</strong> 1.0 ppm <strong>of</strong><br />
polycarboxylate based <strong>antiscalant</strong> at TBT <strong>of</strong> 90 o C
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