What are the main fouling factors of turbine impeller blades? What are the main causes of scaling?
Treatment methods:Install good quality blades, improve the chemical water quality and steam quality; according to the provisions of the operation, reasonable control of the new steam temperature, to ensure that the last blade as far as possible no water production!
The main reason is the scaling of the steam water quality unqualified, containing calcium, magnesium and silicon deposition to form a scale in the leaves, also in the last stage blades of steam turbine, the steam saturation state, humidity, soda carried in calcium and silicon deposition to form a scale on the blade.1, scaling types: 1): sodium phosphate, sodium hydroxide, sodium carbonate, sodium chloride, sodium silicate, silica, iron and copper oxides, and other salts, the specific should be analyzed by the chamber to draw conclusions2, steam turbine indicators: sodium, silicon dioxide, iron, copper content, conductivity3 boiler feed water: conductivity, chloride, hardness, silica, sodium, iron, copper, pH value, oil
The temperature of the new steam is too low, the temperature of the new steam is lowered, and the moisture at the last stage is too large, resulting in water erosion,The quality of the blade is bad.
Causes of salt accumulation:The poor quality of the steam causes the leaf to scale and corrode.
