Method for detection and monitoring of clinker formation in power stations

Abstract

Systems and methodologies for detection and monitoring of the soot build up and clinker formation in coal fired power stations in which there is disclosed early identification of soot build up and hard sintered formation and adopting corrective measures for soot cleaning by automatic cleaning events based on observed levels of heat transfer within the boiler region of the power station.

1 . A method of controlling soot build up, soot cleaning and build up of clinkers in a coal powered power station, the method including the steps of:
 obtaining real on line measurement of heat transfer data, in data analysis using data filtration, operating conditions and limitations (OC) and mathematical interpolation as to correlate soot build up, clinker formation with heat transfer deterioration.   selecting an acceptable Heat Flux (AHF) value, as a minimum value up till which heat transfer deterioration trend can go, before soot cleaning will take place for at least a first region in an interior of the boiler;   selecting a prolonged Low Heat Flux (PLHF) value for at least the first region in an interior of the boiler;   initiating a predefined soot cleaning event A t1  in the at least a first region in an interior of the boiler when the heat transfer deterioration value equals the pre-selected AHF value and monitor results of soot cleaning;   monitoring the heat transfer deterioration value when heat transfer value is equal to PLHF as to initiate calculation of a clinker monitoring time (tPLHF); and   automatically initiating soot cleaning event A t2  based on Heat Transfer Deterioration and AHF value and after that number of soot cleaning events on the same bases up till (and including) A tn  at least at first region in an interior of the boiler during which heat Transfer Deterioration trend is towards the PLHF value.   
     
     
         2 . The method of  claim 1 , further characterized in that after the further predefined cleaning event A tn  if the heat transfer value is still PLHF then activating an alarm means. 
     
     
         3 . The method of  claim 1  further characterized in that at least one of the variables for Heat Transfer Deterioration or AHF or PLHF is dynamically calculated. 
     
     
         4 . The method of  claim 3 , wherein dynamically calculation and data filtration is based on at least one of the variables selected from the group consisting of operating conditions and limitations (OC) as are Steady State of operation, Power Output of the power station, Burner configuration of the boiler, Coal blend, Coal particle size, Tube pressure in the boiler tube, Place in the boiler, High Reheater spray flow but not limited to this only. 
     
     
         5 . An system when used for monitoring heat transfer deterioration in a coal powered utility stations boiler, controlling soot cleaning and determining build up of clinkers in the combustion chamber and boiler region, wherein the system uses the method of  claim 1 .