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Thin Walled Steel Tubular Air Preheater For CFB Coal - Fired Boilers In Power Station

Thin Walled Steel Tubular Air Preheater For CFB Coal - Fired Boilers In Power Station

    • Thin Walled Steel Tubular Air Preheater For CFB Coal - Fired Boilers In Power Station
    • Thin Walled Steel Tubular Air Preheater For CFB Coal - Fired Boilers In Power Station
    • Thin Walled Steel Tubular Air Preheater For CFB Coal - Fired Boilers In Power Station
    • Thin Walled Steel Tubular Air Preheater For CFB Coal - Fired Boilers In Power Station
  • Thin Walled Steel Tubular Air Preheater For CFB Coal - Fired Boilers In Power Station

    Product Details:

    Place of Origin: China
    Brand Name: HD Boiler
    Certification: ASME, SGS, ISO9001
    Model Number: Boiler Air Preheater

    Payment & Shipping Terms:

    Minimum Order Quantity: 1 Set
    Packaging Details: Sea worthy Packing for Export
    Delivery Time: 120 days
    Contact Now
    Detailed Product Description
    Type: Tubular Color: Customer's Requirement
    Application: Thermal Power Station And Industrial Boilers Material: Thin-walled Steel Tube
    Fuels: Coal Warranty: Two Years


    Thin-walled Steel Tubular Air Preheater for CFB Coal-fired Boilers in Power Station and Industry

    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.
    Thin Walled Steel Tubular Air Preheater For CFB Coal - Fired Boilers In Power Station
    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.

    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

    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.

    Contact Details
    Zhangjiagang HuaDong Boiler Co., Ltd.

    Contact Person: Wendy

    Tel: +8618351692506

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