Working Principle of Reverse Osmosis Deionized Water Equipment:

Using the ion exchange method, cationic and anionic ions in water can be removed. Using sodium chloride (NaCl) to represent inorganic salts in water, the basic reaction for water desalination can be expressed by the following equations:

1. Cation exchange resin: R—H+Na+ → R—Na+H+

2. Anion exchange resin: R—OH+Cl- → R—Cl+OH- The overall reaction equation for cation and anion exchange resins can be written as: RH+ROH+NaCl → RNa+RCl+H2O

From this, it can be seen that NaCl in the water is replaced by H+ and OH- on the resin, and the reaction product is only H2O, thus achieving the removal of salts from the water.

Process Characteristics of Reverse Osmosis Deionized Water Equipment:

Ion exchange equipment is a traditional deionized water system with stable water output quality and relatively low cost. In the past, boiler feedwater in power plants was treated using a cation bed + anion bed + mixed-bed process.

With the development of reverse osmosis and EDI processes, the drawbacks of ion exchange equipment, such as complex operation, difficulty in automation, high consumption of acids and alkalis, and high operating costs, have become more prominent. It is now more commonly used for advanced treatment after reverse osmosis.

Small-scale ion exchange equipment often uses organic glass exchange columns, which allow for easy observation of resin operation, such as whether mixed-bed ion exchanger regeneration layering is sufficient, whether cations are "poisoned," and the extent of resin loss.

Large-scale ion exchange equipment uses carbon steel lined with epoxy resin or rubber, with預(yù)留 visual devices to observe the level of regeneration liquid during ion regeneration online.

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