An air preheater (APH) is a general term to describe any device
designed to heat air before another process (for example,
combustion in a boiler) with the primary objective of increasing
the thermal efficiency of the process. They may be used alone or to
replace a recuperative heat system or to replace a steam coil.
In particular, this article describes the combustion air preheaters
used in large boilers found in thermal power stations producing
electric power from e.g. fossil fuels, biomasses or waste.
Purpose of Preheaters
The purpose of the air preheater is to recover the heat from the
boiler flue gas which increases the thermal efficiency of the
boiler by reducing the useful heat lost in the flue gas. As a
consequence, the flue gases are also conveyed to the flue gas stack
(or chimney) at a lower temperature, allowing simplified design of
the conveyance system and the flue gas stack. It also allows
control over the temperature of gases leaving the stack (to meet
emissions regulations, for example).
|Material||Carbon steel, Alloyor equivalent|
|Structure||Vertical or Horizontal|
|Tubes||Enameled seam or seamless tubes|
|Tube OD||customers required|
Advantages of Using Air Heater
The recovery of waste heat from the flue gas and heating the air
required for Boiler In an air heater gives the following
a) The Boiler efficiency is increased.
b) More stable combustion in furnace.
c) The combustion is intensified with the use of hot air.
d) Lower grades of coals can be burnt efficiently with hot-air.
e) The use of hot air, improves the heat transfer rate and so less
heat transfer area will be required.
f) The combustion is made complete with negligible amount of carbon
g) Faster load variations are possible.
h) The coal can be dried effectively for easy pulverization and
1. Fabrication area of 200,000 square meters
2. 150 Engineers
3. 400 Coded welders
4. 60 Licensed Inspectors(NDT Level-III instructors)
5. Class-A Licenses for Design and Manufacture Boiler
6. ISO 9001:2008 Quality System
7. ASME Certificate of Power Boilers
8. ASME 'S','U' and NB stamp authorization
Established in 1985,Zhangjiagang Hua Dong Boiler Co.,Ltd.(trading
as HD Boiler),produces power plant; industrial; waste heat; waste
incineration; biomass; organic heat carrier and electric steam
boilers. Coupled with a comprehensive range of heating surfaces, HD
Boiler brings to the market a unique service including boiler
design , fabrication, installation, maintenance and replacement of
boiler pressure parts.
Contact Person: Mr. Edwin zhao
Business Phone: +86-17715177007
Skype: Edwin HD Boiler