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Air-preheater for Conservation of Flue Gas Energy

Gas Temperatures. Platen Super Heater:Inlet Temperature: 1236.4 0COutlet Temperature: 1077 0CFinal Super Heater:Inlet Temperature: 1077 0COutlet Temperature: 962.4 0CReheater:Inlet Temperature: 962.4 0COutlet Temperature: 724.3 0CLow Temperature Super Heater:Inlet Temperature: 724.30COutl

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Air-preheater for Conservation of Flue Gas Energy

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    1. Air-preheater for Conservation of Flue Gas Energy P M V Subbarao Professor Mechanical Engineering Department

    2. Gas Temperatures Platen Super Heater: Inlet Temperature: 1236.4 0C Outlet Temperature: 1077 0C Final Super Heater: Inlet Temperature: 1077 0C Outlet Temperature: 962.4 0C Reheater: Inlet Temperature: 962.4 0C Outlet Temperature: 724.3 0C Low Temperature Super Heater: Inlet Temperature: 724.30C Outlet Temperature: 481.3 0C Economizer: Inlet Temperature: 481.3 0C Outlet Temperature: 328.5 0C

    10. The Creative Design Heat exchanger is complete only if there are Donor, Receiver and Mediator in Equilibrium. Presence of all the three necessary? Time sharing & Space Sharing Time Sharing : Donor And Mediator for sometime and Mediator and Receiver for sometime : Repeat! Space sharing: All present always. Central Limit Theorem : It is impossible to have time and space sharing in one system. Time Sharing : Regenerators Space Sharing : Recuperators

    11. The concept of Time Sharing At any time: The overall heat transfer coefficient, U

    12. Stockholm 1920 The Ljungstrm Air Preheater

    13. Historical Significance of Landmark Throughout the history of boilers there have been many advancements in order to obtain a better performance and lower fuel consumption. Ljungstrm Air Preheater invented by Fredrik Ljungstrm, then Technical Director at Aktiebolaget Ljungstrm ngturbin (AL) is the most successful invention. The first installation in a commercial boiler saved as much as 25% of the fuel consumption. In a modern Steam generator the Ljungstrm Air Preheater provides up to 20% of the total heat transfer in the boiler process, but the Ljungstrm Air Preheater only represents 2% of the investment.

    14. Economic Impact of the Landmark The use of a Ljungstrm Air Preheater in a modern power plant saves a considerable quantity of fuel. The cost of the preheater is generally recovered after only a few months. The total world-wide fuel savings resulting from all Ljungstrm Air Preheaters which have been in service is equivalent to 4,500,000,000 tons of oil (1994). An estimate shows that the Ljungstrm Air Preheaters in operation annually saves about $30 Billion US. The distribution of thermal power capacity in which Ljungstrm Air Preheaters are installed over the world is shown in the table below.

    16. Landmark Contribution to Development of New World Wide Industry The use of the Ljungstrm Air Preheater started in the 1920s throughout the whole world. In the beginning the marketing of the Ljungstrm Air Preheater was made in close connection with AL. but most of the deliveries have actually been made through a network of licensees throughout the world.

    17. Rotary or Regenerative Air Pre-Heater

    18. Stationary-Plate Type Air Pre-Heater

    19. Regenerative Pre-Heaters Rotates with a low speed Rotor is divided into 12 or 24 sections and 12 or 24 radial divisions. Each sector is divided into several trapezoidal sections with transverse division plates. Heat storage pales are placed in these sections. Weight : 500 tons. This consists of : rotor, sealing apparatus, shell etc.

    24. Leakage in APH

    27. Multiple Channel RAPH

    30. Fluid flows in rotary regenerator

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