Several methods as how to reduce oxygen content in preheat air during the process of a High Temperature Air Combustion(HTAC) are discussed.

On the bearing substitution of air pre-heater in fuel electric plant;

The application of heat pipe and internally ribbed tube in air pre-heater;

The corrosion often happens to the tubes of air pre-heaters in hydrocracking plants and blocks air pre-heaters so much,that the circulative effect is not well.

Influence of heat pipe structure on the lowest wall temperature of air preheater;

Application of the Heat Pipe Air Preheater in the Heating Furnace of a Crude Oil Distillation Plant;

A design of the air-preheater of terminal water supplying boiler;

A successful example of transforming the air-preheater;

This paper introduces the structural features of tube air-preheater, analyzes on the reasons of the welding deformations in the manufacturing process, and describes in detail the method of controlling the welding deformations.