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Steel Boiler Air Preheater As Heating Exchanger For Power Station And Industry

Zhangjiagang HuaDong Boiler Co., Ltd.
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Steel Boiler Air Preheater As Heating Exchanger For Power Station And Industry

Brand Name : HD Boiler
Model Number : Boiler Air Preheater
Certification : ASME, SGS, ISO9001
Place of Origin : China
MOQ : 1 Set
Delivery Time : 40 Days
Packaging Details : Sea worthy Packing for Export
Type : Natural Circulation
Color : Customer's Requirement
Application : All kinds of boiler
Material : Stainless Steel,Carbon Steel
Fuels : Coal,diesel oil
Warranty : two years
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Horizontal And Vertical Type Steel Air Preheater For Boiler And Power Plant

General Introduction

Boiler air preheater is to improve performance of heating change for boilers, and reduce heat consumption. Air preheaters work to transfer the heat carried by exhaust gas from boiler tail flue to the air before entering the boiler through the cooling ribs, and heat the air to a certain temperature.

Usually it is used for coal-fired boilers in power station. They can be divided into tube-box type and rotary air preheaters.Rotary type can be divided into wind hood rotary type and heating surface rotary type. Generally boilers in power staion apply heating surface rotary air preheaters. There are two warehouses, three warehouses and four warehouses types in boilers application. Four warehouses type are commonly used for CFB boilers.

Working principles

Take the rotary type as a example to illustrate the working principles of air preheaters, when under operation, it would be slowly rotating, and exhaust gas will enter the gas flue side of air preheater, and then be dicharged. The heat carried by the gas flue will be absorbed by the cooling ribs of the air preheater, then the air preheater will be rotating slowly, the cooling ribs work to the side of the air, delivering the heat to the air before the air enters the boiler.

The air preheaters applied in boilers are mostly three warehouses type with fire alarm system, internal adjustment system and frequency conversion control system. It is convenient to use air preheaters with easy operation and safe running, meanwhile it can improve the performance of heat transferring of the bouler system, thus it is very common to apply air preheaters in the system of boiler gas flue.
1. Improve and enhance combusion
The air through the air preheater enters the boiler inside, and speed up the fuel processes of drying, ignition and combusion, and makes sure the stable combusion inside the bouler, and improve the combusion effieciency.
2.Enforce heat tranfer
Due to the improvement and enforcement of combusion in the boiler, as well as the increase of hot wind temperature when entering the boiler, the average temperature inside is increased, too. This can enforce the radiation heat transferrring in the boiler.
3.Reduce the boiler loss, decrease the exhaust gas temperature and improve the thermal efficiency of the boiler.
Because the combusion inside is stable, and the radiation heat transferring is enhanced, it can reduce the loss caused by chemical incomplete combusion. On the other hand, the air preheater take the advantage of gas flue heat to further reduce the exhaust loss, which thus improves the thermal efficiency. According to experience, when the air tempeature inside the air preheater is increased by 1.5 degrees, the temperature of gas flue can be decreased by 1 degree. If installed, the air preheater can preheat the air by 150-160 degrees, then can reduce the temperature of gas flue by 110-120 degrees, and increase the thermal efficiency by 7-7.5% as well as save fuel by 11-12%.
4.the heat air can be the fuel desiccant.
For layer-burning boilers, it is okay to use fuel whose miosture and ash content is high when preheated air is available. For power station boilers, hot air is an important desiccant for fat power system and medium to convey coal powder.


Layout item
Horizontal layoutVertical layout
Tube arrangement

staggered arrangement /

in-line arrangement

staggered arrangement /

in-line arrangement

Sealing of pipe and plate

Packing heat- resistant material/



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.

Enamel air preheater products are classified as following by application

1.Enamel heat exchanger designed for denitration renovation projects

2.Enamel heat exchanger for circulating fluidized bed boiler and pulverized coal boilers Heat

exchanger parts for garbage incinerators and biomass boilers

3.Heat exchanger parts for grate furnaces, like chain grate furnaces4.Heat exchanger parts for gas-fueled boilers, such as kerosene boilers, coke ovens, etc.

Product Tags:

air preheater for boiler


air preheater in thermal power plant

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