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[China]
Trade Verify
Address: Address: N0.1, Dongli Road, Donglai, Zhangjiagang City, Jiangsu Province, China
Contact name:Sandy Chen
Zhangjiagang HuaDong Boiler Co., Ltd. |
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General Introduction
Air preheater is a kind of equipment which can improve the heat
exchange performance of the boiler and reduce the energy
consumption. The function of the air preheater is to heat the flue
gas discharged from the tail flue of the boiler and transmit it to
the air before entering the boiler through the radiator, so as to
preheat the air to a certain temperature.
The air preheater is generally used for coal-fired boilers in power
station.It can be divided into tubular type and rotary type. The
rotary type can be further divided into wind hood rotary type and
heating surface rotary type.Power stations usually use the heating
surface rotary air preheater. Generally, the application in boilers
is two-compartment, three-compartment and four-compartment, among
which the four-compartment is more commonly used in 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.
Classification
According to the way of heat transfer, the air preheater can be
divided into two types:heat conduction type and regeneration
type.Among the heat conduction type, tubular air preheater is most
commonly used.With the increase of boiler parameters and capacity,
the heating surface of tubular air preheater increases, which
brings difficulties to the arrangement of the tail heating surface.
Therefore, most of the large capacity units adopt a compact, light
weight rotary air preheater. Air preheater is generally divided
into three types: plate type, rotary type and tubular type.
The main heat transfer component of tubular air preheater is
thin-walled steel tube. The tubular air preheaters are mostly
cubic. The steel tubes are arranged vertically and staggered with
each other. Both ends are welded on the upper and lower tube
sheets.The tubular air preheater is equipped with an intermediate
tube sheet in the tube box. The flue gas passes through the
preheater up and down the pipe, while the air passes through the
preheater horizontally to complete heat transfer.
Tubular air preheater is widely used in power station boilers and
industrial boilers because of its advantages of good sealing, high
heat transfer efficiency, easy manufacturing and processing. The
shortcomings of tubular air preheater are large volume, easy ash
plugging of steel tube content, difficult cleaning and easy wear
and
Parameter
Layout item | Horizontal layout | Vertical layout |
| Tube arrangement | staggered arrangement / | staggered arrangement / |
| Sealing of pipe and plate | Packing heat- resistant material/ | welding |
| Anti-wearing | a,when gas scours external tube, welcoming smoke tubes have
protective tile | |
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.
