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Abstract
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The unit 1 turbine of SAHAND power plant - 325 megawatt- is used to be hampering by silicate and oxide deposits. There are many methods for modification of chemical control withoutchanging of equipment. Some technics are combined water treatment (CWT), All Volatile treatment (AVT), Phosphate equilibrium, congruent phosphate, and so on1. Figure 1 illustrate the condition that all dissolved material becoming through steam and settles on turbine blades. We changed the chemical condition of boiler and feedwater in Sahand thermal power plant to the modified one. This new condition include elimination of base from boiler,elimination of Aluminum fromcooling tower and drum, injecting of new reagents in boiler and feedwaterfor purpose to diminish conductivity, corrosion, carry over, foaming, silicate, deposits and overall result was the clean steam going on turbine. In this new condition we found that the efficiency of steam generator and turbine become better than previous condition.
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