Introduction   In order to effectively solve the problem of flow-accelerated corrosion in the thermal system and high scaling rate of boiler of supercritical unit, the feed water needs to be treated.

    Method   At present, there were three kinds of water treatment: reducing total volatilization treatment, weak oxidation total volatilization treatment and oxygenated treatment.

    Result   After the oxygenated treatment of feed water, the shape of the oxidation film on the heating surface of the boiler is changed, and the amount of ammonia can be appropriately reduced, which is beneficial to improve the quality of mixed bed effusive water. For the supercritical DC furnace, the dissolved salts of steam are also reduced, and the corrosion and salt formation of the medium and low pressure cylinders of steam turbines are further improved.

    Conclusion   At present, feed water with oxygen treatment is the best choice for supercritical unit.