KRR UK LIMITED - Cost effective, safe and proven boiler cleaning

CASE STUDY 2
Routine clean of passes 3 and 4 in a 4-pass boiler with horizontal pass 4
(Veolia Birmingham - Jan 2006)

This routine clean takes place every 800-900 operating hours, keeping the pressure loss across the boiler constantly low and reducing the boiler exit temperatures. Boiler fouling is generally kept under control between offline cleans.

KEY STATISTICS

Parameter Designation	Before Clean	After Clean	Change	Comments
Back end pressure mbar	-4	-4	0	No change; initially reductions from 7-8 to 4 mbar were achieved
T1 T Intermediate Pass 4 (Outlet SH3) °C	611	488	-123
T2 T Intermediate Pass 4 (Outlet SH2) °C	423	347	-76
T3 T Outlet Pass 4 °C	274	207	-67
Steam flow t/h	67	66	-1

BENEFITS
The need for unplanned offline cleaning is eliminated. There is no impairment of generation, higher operational reliability and lower cooling load on the FGT system.

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