EFFECT OF QUALITY OF RAW WATER FOR CHEMICAL DEMINERALISATION PLANT ON WATER-CHEMISTRY OF THERMAL POWER STATIONS.

To reduce to a minimum the effect of water-chemistry conditions on a stress-corrosion cracking of turbine disks, quality of steam entering turbines is standardized with respect to a number of characteristics including specific electrical conductivity kappa , the value of kappa for the steam of thermal stations with drum boilers adopted being 0. 3 mu S/cm by analogy with supercritical once-through boilers. A comparison of the stations with respect to quantities of demineralized water required for makeup of boilers leads to the conclusion that the specific electrical conductivity of the steam depends on makeup of water in a boiler circuit, the source of raw water for the chemical demineralization plant and how it is treated.