Investigation Method to Reduce Silica from Boiler Feed Water to Improve Boiler Performance of the Plant

During routine of boilers, water analysis of blast furnace, it was observed that, silica, conductivity & PH value increases as compared to normal value, also wheel chamber pressure & axial displacement of the impulse with reaction type turbine increases. After checking it is found that, the demineralised water plant has committed mistake during regeneration. The design specification of the boiler and DM plant has to provide DM water less than < 0.02 ppm (20 ppb) of Silica (Sio2), but it was providing water, more than > 0.02ppm (20 ppb) of Silica. Hence to achieve designed value, various parameters affecting the boiler performance are studied in detail. The best method after theoretically observation is found to be the method of Ultrafiltration. This filtration method provides water at designed rate & also results in decreased in silica level, conductivity, fuel consumption & steam generation is increased.