The blowdown percentages may not be used in conjunction with Figure 5.13 to determine the annual cost of blowdown and the potential energy cost savings associated with reducing boiler blowdown.

Select Raw-Water Treatment System for Largest Reduction in Raw-Water Impurities. Since a large investment would be associated with the installation of new equipment, this energy conservation method is usually applicable to new plants or revamps only. A water treatment consultant should be retained to recommend the type of treatment applicable. An example of how water treatment affects blowdown follows.

Example: Determine the effects on blowdown of using a sodium zeolite softener producing a water quality of 350 ppm solids and of using a demineralization unit producing a water quality of 5 ppm solids. The makeup water rate is 30% and the allowable drum solids level is 3000 ppm.

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