Air Preheaters in Working, Function and Types

Air Preheaters (APH) is the Shell and tube type Heat Exchangers used for preheating the air which is fed to the boiler or furnaces/kilns for combustion of fuels. Air Pre heater’s primary objective is to extract the waste heat from the flue gases leaving the boiler.

SMC group manufacture Air Preheaters and are given as a standard side accessory along with the main equipment – Boiler, in a Packaged Type Boiler, Combi Boilers.

Why is hot air sent to the furnace?

For generating fire in a boiler furnace 3 main ingredients are needed: Fuel, Air & Ignition. Air is used in a Boiler for combustion of fuel. Based on the stoichiometry calculation, the right quantity of air along with excess air is fed into the boiler furnace for the combustion of fuel.

Generally, fuel fed to the boiler is at normal room temperature and for combustion of fuel to take place; the temperature of the fuel is increased from its room temperature to ignition temperature. So to increase the efficiency of the combustion process as well as a boiler, hot air is fed to the furnace for the combustion of fuel.

Type of Air Preheaters (APH)

We manufacture different type of air preheaters:

Shell and tube type single pass air pre-heaters

Shell and tube type dual-pass air pre-heaters

Finned tube air pre-heaters

SMC group manufacture air preheaters that are tailor-made to suit the customer’s requirement. Our Air Preheaters are designed in both 1 and 2 pass for both flue gases and air to extract maximum heat from the flue gases. SMC group manufacture air pre-heaters for wide capacity range and can satisfy the various fuel requirements of a customer such as:






Light Oil and Heavy Oil

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