1) The process of boiler water treatment
Filtered water from the industrial water pretreatment system, the cations are removed by the cations filled with hydrogen-type cation exchange resins, and during the exchange process, H and the anions in the water constitute the corresponding inorganic acids. The water containing inorganic acid enters the human degassing tower, and the air is drummed into the lower part of the tower, the CO2 in the water is removed, and the anion in the water is removed by pumping to the pubic bed equipped with a hydrogen-oxygen type anion exchange resin. The water treated by the yang bed and the yin bed is called purified water, and the conductivity of the purified water (25 °C) is less than 10 μS/cm, and the SiO2 < 200 μg/L. The purified water is then treated by mixing the bed and removing the remaining anions from the yang bed and the negative bed treatment. The result is a desalinated water with a conductivity (25°C) of less than 0.2 μS/cm, SiO2 < 20 μg/L. The desalinated water is then deoxygenated and medicated and sent to the boiler.
(2) Deaeration treatment of desalinated water
The deaeration treatment of desalinated water is carried out in two steps, first using thermal deaeration to remove most of the dissolved oxygen in the water, and then adding a chemical deaerator to remove the residual oxygen.
(3) Dosing treatment of boiler feed water
Water fed into the boiler. Including condensate of steam turbine steam, recharge water, return water of steam for heating, etc. In order to prevent impurities from being brought in from the make-up water or leaking from the steam turbine condenser into the furnace, so that the boiler will be scaled and corroded, a certain amount of agent needs to be added to the drum furnace feed water (DC furnace does not have this step), these agents are generally trisodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate and sodium hexametaphosphate.