7.1 Suppose that a reputable firm has been advertising a new burner system that would enable the boiler in Section 7.5 to operate at 8% excess air before CO was detected in the flue gas. Why would this system be worth examining? Quantify your answer. Two Boilers Present System None One Big Boiler $14,000,000 FIRST COST $12,500,000 ANNUAL COSTS Gas $2,500,000 $0 $0 Coal $0 $0 $306,900 $300,000 $50,000 $250,000 Boiler Maintenance Waste Transportation $0 $0 $50,000 (40,000 T * $1.25) $100,000 (40,000 T x $2.50) Waste Landfilling (First year) Ash Transportation $0 $0 $0 $8,700 (6940 T x $1.25) $14,000 (11,200 T $1.25) $0 $17,350 (6940 T