Page 162 - Boiler plant and distribution system optimization manual
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Over 100 Ways to Improve Efficiency 147
Figure 10.40—Increasing Cycles of Concentration saves on energy, water and chemicals.
Figure 10.41—Automatic blowdown control enables a 33% reduction in blowdown.
Potential Savings Steam generators normally have very high
Moderate (2%-3%) temperature flames and gases heating boiler wa-
ter and generating steam through the tube walls.
The buildup of boiler scale constitutes a The metal tubes in the boiler are kept cool by the
growth of crystals on waterside heat transfer sur- boiler water. When scale forms, it acts like an in-
faces and is most severe in those areas of the boil- sulation material between the water and the met-
er where maximum heat transfer occurs. (Figure al. This results in tubes operating at higher tem-
10.42) shows the relationship between heat trans- peratures. The greater the thickness of the scale,
fer efficiency and scale deposit thickness. the greater the insulating effect, and the higher
