Steam solubilities for combustion turbine steam cooling

Steam cooling of combustion turbine parts provides significant advantages o ver air cooling. Steam potentially carries dissolved salts that can deposit on the cooled parts and cause corrosion. By maintaining the salt concentra tion below its solubility limit in the steam, deposition of salts may be av oided. A literature survey reveals that only sodium chloride and silica hav e adequate data for reasonable extrapolation to the strain cooling conditio ns. Estimates of steam solubility of sodium sulfate and sodium phosphate us ed liquid-vapor distribution coefficients fur a solubility at saturation an d sodium chloride as a model compound to extrapolate the solubility to othe r conditions. Copper oxide data were also insufficient to predict steam sol ubilities with confidence. The large potential errors in the sodium phospha te and sodium sulfate solubility estimates may add considerable cost to the water treatment system. Accurate experimental values for sodium sulfate an d sodium phosphate solubilities in steam are needed.