� DR. TUGRUL TURKMENOGLU ırrnrn rnM �11 w�ıırn FinRo LTD. Co eneratimı, Waste r�over , �eııewa6fus &' On�site §enenıtimı With HELAMIN Without HELAMIN sion in boilers, particularly if these are operated at high temper ature and pressures. Other gases, ammonia attacks copper, hydrogen sulphide and chlorine cause low pH corrosion. 6. Corrosion in Condensate Systems Condensate systems are mostly subjected to corrosion caused by the presence of carbon dioxide, which is formed by the decomposition of the bicarbonate in boiler water. The dissolved carbon dioxide forms carbonic acid and lowers the pH of the condensate, causing low pH corrosion. The corrosion products from the condensate system are transported to the feed water tank and into the boiler, where these products create more deposit and corrosion problems. 7. Foaming and Carry-over Foaming is a mechanical entrainment process governed by the surface tension of the boiler water, whereby bubbles are formed on the water surface in the steam drum. A rapid increase of the boiler load, too high boiler water level, and insufficient steam separators can lead to foaming. The surface tension and there by foaming is affected by the different components of the boiler water, such as suspended solids, dissolved solids, and any organic material like oil, ete. � E-COGENERATION WORLD & Renewable Energy High alkalinity increases the surface tension and the tendency to foam build-up, mechanically entrained substances of low sol ubility turn to particulate as the steam passes through the superheater. Such particulate matter carried along with steam may be deposited on turbine blades, and bring down the tur bine performance. Volatile carry-over increases proportionately at high operating pressure>40 bar, especially at high concentrations of dissolved matter, like silica, sodium hydroxide and phosphate. Treatment of boiler water and condensate with HELAMIN An optimized running of the steam and heating plants can often be achieved through an appropriate feed water treatment, which improves the conditions of the water side of the boiler. Recent advances in boiler water treatment have shown effec tive corrosion control and prevention of scaling can be achieved by employing polyamine based multi-component additives. This inhibitor not only neutralizes carbon dioxide, but also establish es a monomolecular barrier film between the metal surface and the corrosive water. The dosage required is low and is substantially independent of the concentration of oxygen. Filming inhibitors contain different types of neutralizing amines and regulate the pH-level in the boiler and condensate systems. Deposits in boiler systems which results in thick iron oxide lay ers, are due to non-uniform formation of magnetite. Using a mixture of polyacrylates and polyamine, under a combination (HELAMIN 906 H), it becomes possible to influence the solubili ty of magnetite and so to optimize the structure without com pletely avoiding its formation. Under HELAMIN TREATMENT existing magnetite layers are being refined and the boiler surface are covered with very thin (approx., 50 ğm) but stable protective magnetite layers (Bloom oxide). SUMMARY The polyamines have been selected, besides their film forming tor their very efficient dispersing action. This allows a controlled reduction of magnetite scale, ensuring a more efficient heat transfer and an excellent protection of the whole metal surface. The use of HELAMIN offers removal of foulant, and an increase in turbine efficiency. Last but not least, HELAMIN is comparatively favourable in terms of environmental and economical aspects.
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