Discussing of Boiler EDTA Cleaning Technics Conditions

The priciple and technics of the chemical cleaning with EDTA, the choice and control of technological conditions (including the concentration of EDTA, the temperature, the pH value, the velocity of flow and the cleanin-g time), the judgement on the ultimate cleaning and passivation, and the technological supervision of the chemical cleaning with the EDTA ammonium and sodium salt were illustrated. Chemical cleaning were characterized with simplicity, wide range, safety and shorter time spent in cleaning. In practice, the factors affecting EDTA cleaning performance, including the parameters such as, cleaner temperature, concentration, pH, flow rate; as well as the process of cleaning and the optimal cleaning to achieve the best cleaning performance. The #5 new-built boiler adopting EDTA ammonium salt as cleaner in the power plant is a good example of this case.