Summary of presentation

Varying fuel qualities lead to a changed fouling behaviour in the furnaces and sometimes to heavy fouling at the coal burners.

This slagging affects operational safety and results in a changed flame control. The increased non-homogeneous fouling of the evaporator walls leads to the reduction of heat absorption in the radiation section and thus to an increase of the furnace end temperature.

Conclusion

 Reduction of the furnace end temperature is of central and decisive importance for the reduction of slagging in the first convection heating surfaces and for the increase of efficiency of the steam generator. In this connection optimised, targeted and demand-oriented cleaning of the heating surfaces in the furnace constitutes an important control variable. In recent years the water lance blowers have successfully demonstrated their usefulness for targeted and effective cleaning of the furnace heating surfaces - especially in steam generators which are fired by lignite and bituminous coal. By adding of the sensor-based FACOS™ optimisation system the cleaning instruments can be used in line with the actual requirements. This complete furnace management system enables effective and demand-oriented on-load cleaning of the evaporator heating surface, in particular for the combustion of varying coal qualities. In this way a decisive contribution is made to increasing operational safety of coal-fired steam generators and lowering of operating costs. Thus, the CO2 emission is also reduced through the increase of efficiency.

Agenda

• Slagging Problems by Changing Coal Qualities
   
• RWE Rheinbraun Power Plant Niederaußem Unit G
   
• The Cleaning Technology for Furnaces: WATER CANNON
   
• FACOS^TM - The new Solution for selective Furnace Cleaning
   
• Results: Efficiency and Economy
   
• Outlook