Tubular Type Air Preheater APH Shell and tube dual pass air
preheaters none pressure parts
Air Preheaters (APH)
- 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.
- Thermodyne Engineering Systems manufacture Air Preheaters and are
given as a standard side accessory along with the main equipment –
Boiler, in a Packaged Type Boiler, Combi Boilers.
Working of Air Preheaters(APH)
- Air Preheaters have a shell and tube type construction where
exhaust heat from the flue gases is transferred to the air when
they come in indirect contact with each other.
- Air Preheaters consist of a shell where tubes are arranged in a
square or triangular pitch and are welded to a tube plate.
Depending upon the type of operation and ease of cleaning, flue
gases & air can be allowed to travel either shell side or tube
side interchangeably.
Tubular type Air Preheater
- Tubular preheaters consist of straight tube bundles which pass
through the outlet ducting of the boiler and open at each end
outside of the ducting.
- Inside the ducting, the hot furnace gases pass around the preheater
tubes, transferring heat from the exhaust gas to the air inside the
preheater.
- Ambient air is forced by a fan through ducting at one end of the
preheater tubes and at other end the heated air from inside of the
tubes emerges into another set of ducting, which carries it to the
boiler furnace for combustion.
Air Preheater Pros
- 2 pass design to extract maximum waste heat from flue gases leaving
the boiler.
- It is used to extract waste heat from the flue gases leaving the
boiler exhaust thereby increasing the efficiency of a boiler by 2-3
%.
- It is used to preheat the fuel which further increases the boiler
efficiency.
- Payback time is less.
Air Preheater Cons
- Adding and equipment or accessory in the path of flue gases
increases flue gas pressure drop down the line, so the size of
Induced Draft Fan increases.
- Buy Air Preheater from Indian Manufacturer: Thermodyne Engineering
Systems: Contact Us
- Other Industrial Steam Boiler Ancillaries
- Superheaters
- Economizer
- Bag filter
Details
| Layout item | Horizontal layout | Vertical layout |
| Tube arrangement | staggered arrangement /in-line arrangement | staggered arrangement /
in-line arrangement |
| Sealing of pipe and plate | Packing heat- resistant material/
welding | welding |
| Anti-wearing | a,when gas scours external tube, welcoming smoke tubes have
protective tile
b,when gas scours inside tube,wear casing pipes are installed in
gas inlet |
Hydraulic Test
