Calculation and Analysis

Using the curves in Figure 5.13, enter Chart A at 10% blowdown to the curve for 150 psig boiler drum pressure. Follow the line over to chart B and the curve for a unit efficiency of 80%. Then follow the line down to Chart C and the curve for a fuel cost of $2.00/106 Btu. Read the scale for the equivalent fuel value in blowdown. The cost of the blowdown is estimated at $8.00/hr per 100,000 lb/hr of steam generated. Repeat the procedure for the blowdown rate of 12% and find the cost of the blowdown is

$10.00/hr per 100,000 lb/hr of steam generated. Potential energy savings then is estimated to be = ($10.00 - 8.00/hr/100,000 lb/hr)

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