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From the relationship BD/S = [L/S] / [NC - 1] calculated at material balance in boiler section, as long as L/S is related to system parameters and it is independent to water analysis, the increase of NC lowers the BD/S ratio. So, our target is to increase NC to the maximum, for
water and energy conservation. BD is necessary as to remove troublesome impurities from the boiler, and to keep material balance under control. In this section we have to examine the most important impurities and their effects to the boiler operation, as to define their maximum permissible limits.
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