Steam Boilers, Engines, Nozzles and Turbines
The three "Ts" for good combustion are

Thorough mixing, total air and temperature
Total air, true fuel, and turbulence
Temperature, time, and turbulence
Total air, time, and temperature

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Steam Boilers, Engines, Nozzles and Turbines
In regenerative air preheaters, the heat is transferred

Heat is transferred by bleeding some gas from furnace
From a metal wall from one medium to another
From heating an intermediate material and then heating the air from this material
By direct mixing

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