Boilers and cooling towers share two major water related problems: deposits and corrosion. As steam is generated by a boiler or water evaporating from a cooling tower, dissolved minerals are left behind, increasing the concentration of these minerals. Additional minerals are introduced via the water added to makeup the water lost to steam/evaporation. Eventually, the minerals reach a level (or cycle) of concentration that will cause either loss of efficiency due to scale or damage from corrosion. This level can be determined by the Ryznar or Langlier indices and correlated to a conductivity or TDS range. Most people recognize problems associated with corrosion. Effects from scale deposits, however, are equally important. For example, as little as 1/8` of scale can reduce the efficiency of a boiler by 18% or a cooling tower heat exchanger by 40%!
By Myron L Company based in Carlsbad, CALIFORNIA (USA).
In ongoing operation, the substances suspended in the boiler water are concentrated. In order to avoid the negative consequences (foaming, deposits) of excessive salt content in the boiler water, specified limit values must not be exceeded. With the aid of a desalination control valve, boiler water with concentrated content is constantly removed and replaced with clean water. If the limit values are exceeded, the conductivity limitation ensures prompt switching off of the burner(s). Foreign substances that have sunk to the bottom of the boiler are removed by briefly opening a drainage valve.
By IGEMA GmbH based in Münster, GERMANY.
Process water covers the wide range of boiler feed water, cooling water for heat exchangers or engine, chemicals dilution, etc. It should typically have a conductivity ranging from 0,1 to 50 uS/cm, with little to no hardness to avoid scaling in heating system. Oxygen and carbon dioxide should be removed to prevent corrosion. Depending on your application, the water quality requirements can vary: Boiler feed water characteristic. Cooling water quality. Tap water or fresh groundwater are the most widely used source of water to produce process water.
By Lenntech Water Treatment based in Delfgauw, NETHERLANDS.
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