Combustion air preheaters

Combustion air preheaters

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While the utilization of the waste heat in the chimney gases for preheating the combustion air supplied to the boiler furnace, by means of air heaters, has long had a wide use in steamships, as, for example, in the Howden system. By raising the temperature of the air supplied to the furnace, the combustion temperature is raised, and the absorption of heat from the burnes flame by radiation and from the gases by conduction and convection is increased.
The overall efficiency is improved, as less heat is lost in the funnel gases.

Combustion air preheater
  1. Combustion air intake
  2. Combustion air fan
  3. Rear wheel with driving support roller
  4. Hod over driving roller
  5. Hod ove guiding roller
  6. Valve for steam sot blowing
Combustion air preheater drawing
  1. Combustion air intake
  2. Combustion air fan
  3. Flue gas fan
  4. Hot combustion air
  5. Hot flue gases
  6. Cold flue gases
  7. Slowly rotating heat exchanger