Thermodyne Boilers Industry Blog

1. HARDNESS (Ca++/Mg++)         Scale deposits in Steam Boiler inhibit heat transfer and thermal efficiency   2.TOTAL DISSOLVED SOLID(TDS)  Primming,   Foaming,   scale deposits in boiler   3. CARBON DIOXIDE  (CO 2 )            Corrosive, forms carbonic acid in condensate.   4. OXYGEN  (O 2 )             Corrosion & Pitting of boiler tubes , and turbine blades, failure of   steam  lines, and fittings     5. SILICA (SI)             Hard scale in boilers and cooling systems: turbine blade deposits. 6. HYDROGEN SULPHIDE (H 2 S)           Water smells like rotten eggs: Tastes bad & is corrosive to most metal    

FOAMING IN BOILER Formation of the layer of froth or stable foam on the surface of the water is called Foaming. Causes: 1. High concentration of solids in boiler water 2. Various chemicals present in boiler water 3. Effect of solids and chemicals on the surface tension of water. 4. Presence of organic substances, oil, fats, greases in water Effects: 1. Scaling in boiler 2. Corrosion in boiler 3. Reduced efficiency of boiler 4. Reduced heat transfer rate in boiler PRINENTIVE MESURES: 1. Maintain TDS in boiler water at low levels 2. Use of anti-foaming agents 3. Use of mixtures of surface active agents that modifies surface tension of liquid and remove foam 4. Continuous and intermittent blowdown 5. Check whether boiler chemical added are in excess 6. Detect the source of contamination