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Based on: Industry Standards and Best Practices

Languages: English

Sample Transcript

Ion exchange is the main process used to control purity and pH of boiler feed water. Ions are atoms or molecules that have split up in water and lost or gained an electron and have thus acquired an electrical charge. Ion exchange is a reversible chemical reaction, in which ions present in a solution are exchanged for a similarly charged ion attached to an immobile solid particle of ion exchange material. This process involves treating the feed water with an exchange resin. Because ions have positive or negative charges, there are different types of exchange resins. Cation resins exchange positively charged functional groups for undesirable positive ions. Anion resins exchange negatively charged functional groups for any undesirable negative ions. Ion exchangers are generally classified into two groups: Single bed ion exchangers and mixed bed ion exchangers.

Boiler Feedwater - Demineralizer

Training Time: 16 minutes

A boiler recovers heat from burned fuels. This is accomplished when high pressure boiler feedwater inside tubes located throughout the boiler is heated and turns into steam or hot water. The steam or hot water is then used in a variety of facility processes. Boiler feedwater often contains inorganic salts, dissolved impurities, and foreign particles, which generate corrosion problems and decrease efficiency due to damage to heat transfer surfaces. Demineralizers use ion exchange resins to remove these impurities in the raw water used for makeup in boiler feedwater.

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Ion exchange is the main process used to control purity and pH of boiler feedwater.

The water to be purified enters the top at a set flow rate and flows down through the resin beads, where the flow path causes a physical filter effect as well as a chemical ion exchange.

The second step of regeneration uses an acid solution for cation units and caustic solution for anion units.

Learning Objectives

  • Identify and describe the safety hazards and safe work practices associated with boiler feedwater demineralizers
  • Explain the purpose of boiler feedwater demineralizers
  • Describe the ion exchange process
  • Identify and describe the two most common types of demineralizer designs
  • Explain the regeneration process used in demineralizers
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Boiler Feedwater - Demineralizer FAQs

What is the purpose of boiler feedwater demineralizers?
Boiler feedwater often contains inorganic salts, dissolved impurities, and foreign particles, which generate corrosion problems and decrease efficiency due to damage to heat transfer surfaces. Demineralizers use ion exchange resins to remove these impurities in the raw water used for makeup in boiler feedwater.

What is the ion exchange process?
Ion exchange is the main process used to control purity and pH of boiler feedwater.

What are the two most common types of demineralizer designs?
Single-bed demineralizers and mix-bed demineralizers.

What is the regeneration process used in demineralizers?
Ion exchange resins have a certain capacity for removing ions from water and when their capacity is used up they have to be regenerated.

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