The Application of PLC in the Auto-control System of Chemical Makeup Water Treatment of Boiler

Because the boiler is developed to the trend of large size, high temperature and high pressure, so the requirement of water quality for the boiler makeup water is higher and higher, and that needs to almost get rid of all salts in the water. So anion-cation exchange technology has been developed quickly. For example, use the H cation exchanger to exchange various cations in the water and give out H, and use OH cation exchanger to exchange various anions in the water and give out OH. Through the exchange treatment of anion-cation exchanger, all salts in the water will be basically ridded. This method is called water chemical salt ridding treatment. When the raw water gets across the cation exchanger, cations such as Ca, M g, K and N in the water will be absorbed by the exchanger and commutative H on the exchanger will be replaced to the water, and create corresponding inorganic acid with anions in the water. This sort of cation exchanger is also called as the cation-bed.