60.How to operate the SADs in a wall fired and corner fired boiler?

SADs will be opened fully in wall fired boiler. The air flow to each burner in service will be always equal. Hence unbalanced loading of fuel between mills shall be avoided except starting. In a corner firing, the fuel air damper will be function of mill load. The AAd will maintain the Wind-box/furnace differential pressure constant at 40 mm WCL before any mill is in service and at 180 mmWCL after any mill is taken to service