Method for reducing waterwall corrosion in low NOx boilers

A method to reduce waterwall corrosion in a low NOx boiler includes the steps of locating a waterwall area of a low NOx boiler where oxidizing conditions exist and deposition of FeS is likely. The combustion air input at the waterwall area is biased to reduce FeS deposition on the waterwall. The bia...

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Bibliographische Detailangaben
Hauptverfasser:	BAKKER, WATE T, FACCHIANO, ANTHONY
Format:	Patent
Sprache:	eng
Schlagworte:	AIR AIR SUPPLY BLASTING BURNERS COMBUSTION APPARATUS COMBUSTION PROCESSES DRAUGHT-INDUCING FLUES HEATING LIGHTING MECHANICAL ENGINEERING METHODSOR APPARATUS FOR COMBUSTION USING FLUID FUELOR SOLID FUEL SUSPENDED IN REGULATING OR CONTROLLING COMBUSTION REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTIONRESIDUES SUPPLYING NON-COMBUSTIBLE LIQUID OR GAS WEAPONS
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Zusammenfassung:	A method to reduce waterwall corrosion in a low NOx boiler includes the steps of locating a waterwall area of a low NOx boiler where oxidizing conditions exist and deposition of FeS is likely. The combustion air input at the waterwall area is biased to reduce FeS deposition on the waterwall. The biased combustion air input increases the oxidation rate of FeS2 so as to reduce FeS deposition on the waterwall. The biased combustion air input may be achieved by increasing the air-to-fuel ratio of one burner while reducing the air-to-fuel ratio of another burner, such that the overall air-to-fuel ratio in the low NOx boiler is substantially constant.