Steam Boilers, Engines, Nozzles and Turbines
Gusset stays in a boiler are provided to

Prevent leakage of hot flue gases
Prevent the bulging of flat surfaces
Support furnace freely from top
Avoid explosion in furnace

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

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

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