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Boiler Air Preheater Boosts Efficiency

Boiler Air Preheater
January 27, 2026
Category Connection: Boiler Air Preheater
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Tags:
#air preheater and economiser #economizer and air preheater #air pre heater in boiler
Brief: Let’s dive in — see this solution in action and notice the key moments. This video provides a detailed walkthrough of the Recuperative Boiler Air Preheater, demonstrating how it recovers heat from boiler flue gases to improve efficiency and control exhaust temperatures. You'll learn about its construction, operation, and the role it plays in optimizing power generation systems.
Related Product Features:
  • Recovers heat from boiler flue gases to significantly improve overall boiler efficiency.
  • Controls the temperature of exhaust gases exiting the stack, simplifying duct and stack design.
  • Available in tubular types built into boiler flue gas ducting for integrated heat recovery.
  • Features regenerative types like the Ljungstrom design, available in horizontal or vertical orientations.
  • Utilizes a rotating rotor design with bi-sector or tri-sector configurations to separate gas and air paths.
  • Includes radial and circumferential renewable seal plates to minimize leakage between sectors.
  • Equipped with a robust support system including thrust bearings and roller bearings for stable operation.
  • Incorporates an oil bath lubrication system cooled by water coils to manage shaft temperatures.
FAQs:
  • What is the main purpose of a boiler air preheater?
    The main purpose is to recover heat from the boiler's flue gas to improve boiler efficiency and to control the temperature of gases exiting the stack, which also simplifies the design of ducting and the stack.
  • What are the common types of air preheaters used in power generation utilities?
    Common types include tubular air preheaters built into the boiler flue gas ducting and regenerative types like the Ljungstrom Regenerative Air Preheater (RAPH), which can be horizontal or vertical and feature rotating designs with bi-sector or tri-sector configurations.
  • How does the Ljungstrom Regenerative Air Preheater minimize leakage?
    It uses seals on the casing and rotor to divide gas and air paths, along with radial and circumferential renewable seal plates, to keep leakage between sectors to a minimum during operation.
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