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CASE STUDY 1
Emergency clean to remove blockage in SH2 after failure of the soot blower in a 3-pass boiler with separate economiser
(Sita Tees Valley - 29 Dec 2005)

KRR were called to the Sita Tees Valley site after a soot blower failure had caused a blockage. The team were on site within 24 hours, and the clean successfully achieved within one working day.

Thanks to KRR’s intervention the operators were able to continue generation until a scheduled shut down. The change in pressure loss shows that the blockage can be partly or totally removed. The higher Delta P across the economiser is due to increased steam production. The temperature reduction is a welcome by-product.

KEY STATISTICS
Parameter designation
Before Clean
After Clean
Delta-P Pass 3/Economiser before clean
Delta-P Pass 3/Economiser after clean
Change
P after/ Delta P Pass 3 mmWG
-47.4
-14.4
41.4
8.4
-33
P after/Delta P Economiser mmWG
-113
-96.7
65.6
82.3
+16.7
T before SH °C
492
561
n/a
n/a
+69 (increase due to higher load)
T after SH °C
385
346
n/a
n/a
-39
T after Eco °C
202
197
n/a
n/a
-5
Steam load t/h
40.3
46
n/a
n/a
+5.7


BENEFITS
There was no long term impact on generating capacity ensuring income was maintained cost effectively. The following table shows the effect on the temperatures at points T1 and T2 on the diagram.

Location
Temperature Before Clean
Temperature After Clean
Change
T1 - Entrance Convestion
492
561
+59
T2 - End of Boiler
202
197
-5

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