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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8<br />
1.2<br />
7<br />
0.8<br />
Overall Heat Transfer<br />
Coefficie nt, kW /m 2 K<br />
Dose rate (ppm)<br />
6<br />
0.4<br />
5<br />
0<br />
4<br />
-0.4<br />
3<br />
-0.8<br />
U Design<br />
=2.491<br />
2<br />
-1.2<br />
0 20 40 60 80 100 120 140 160 180 200<br />
Hours<br />
Dose Rate ppm<br />
0.5<br />
1.2<br />
Fouling Fact<strong>or</strong>, m 2 K/kW<br />
0.4<br />
0.3<br />
0.2<br />
0.1<br />
FF Design = 0.215<br />
Dose rate (ppm)<br />
0.8<br />
0.4<br />
0<br />
-0.4<br />
-0.8<br />
Dose Rate ppm<br />
0<br />
-1.2<br />
0 20 40 60 80 100 120 140 160 180 200<br />
Hours<br />
Figure 1. Impact <strong>of</strong> gradual dose rate reduction <strong>of</strong> phosphonate based<br />
<strong>antiscalant</strong> on brine heater Perf<strong>or</strong>mance at TBT <strong>of</strong> 90 o C<br />
8<br />
1.2<br />
Overall Heat Transfer<br />
Coefficient, kW /m 2 .K<br />
7<br />
6<br />
5<br />
4<br />
3<br />
0.8<br />
0.4<br />
0<br />
-0.4<br />
-0.8<br />
Dose Rate, ppm<br />
2<br />
0 100 200 300 400 500 600<br />
Time, Hours<br />
-1.2<br />
0.5<br />
1.2<br />
Fouling Fact<strong>or</strong>, m 2 .K/kW<br />
0.4<br />
0.3<br />
0.2<br />
0.1<br />
Design Value = 0.215 m 2 .K/kW<br />
0.8<br />
0.4<br />
0<br />
-0.4<br />
-0.8<br />
Dose Rate, ppm<br />
0<br />
-1.2<br />
0 100 200 300 400 500 600<br />
Time, Hours<br />
Figure 2. Impact <strong>of</strong> gradual dose rate reduction <strong>of</strong> polycarboxylate based<br />
<strong>antiscalant</strong> on brine heater perf<strong>or</strong>mance at TBT <strong>of</strong> 90 o C
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