Calculation and Analysis

Calculate the impurity concentration in the boiler feedwater (BFW):

A = MU impurity x (1.00 - % CR) A = 350 ppm x (1.00 - 0.25) A = 262 ppm

Mathematical solution.

For drum water impurity level of 3000 ppm: % BD = A/(B - A) % BD = 262/(3000 - 262) % BD = 9.6%

Figure 5.14 Automated continuous blowdown system.

For drum water impurity level of 6000 ppm:

Figure 5.15 Required percent blowdown. Based on equation 5.5.
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