High Safety Carbon Steel Boiler Air Preheater Improving Boiler Performance

• Customization: Available
• Certification: ISO
• Customized: Customized
• Model NO.: Boiler Air Preheater
• Surface Treatment: Painted
• Fuel: Coal
• Range of Applications: Power station, Industrial
• Type: Boiler Air Preheater
• Material: ND Steel / Carbon Steel / Alloy Steel etc
• Standard: ASME Standard or GB
• Application: Boiler Part
• Color: Metal Color, Black, Silver
• Transport Package: Iron Frame Packing/Customized
• Specification: Customized
• Trademark: HD BOILER
• Origin: China
• Production Capacity: 500 Tons/Month

Product Description

General Introduction: Air Preheater

 

       The air preheater is a boiler preheating equipment, which can improve the heat exchange performance of the boiler and reduce the heat loss. The air preheater conducts the heat carried in the flue gas discharged from the tail flue of the boiler to the air before entering the boiler by using the heat sink, so as to preheat the air to a certain temperature. The air preheater is mostly used in coal-fired power station boilers, there are two kinds of tube type and rotary type, of which the rotary type is divided into two kinds of wind hood rotary type and heating surface rotary type. Rotary surface preheater is often used in power plant boiler.
 

 

Working Principle

 

        Taking the rotary air preheater as an example to illustrate the principle of air preheater, it will rotate slowly during operation, the flue gas will enter the flue gas side of the air preheater and then be discharged, and the heat carried in the flue gas will be absorbed by the heat sink in the air preheater, and then the air preheater rotates slowly, the heat sink moves to the air side, and then the heat is transferred to the air before entering the boiler.

        The application of air preheater in boiler is mostly three-compartment type, with fire alarm system, gap adjustment system and frequency conversion control system. Air preheaters are easy to use, simple to operate, safe to operate, and can improve the heat exchange performance of the boiler system, so it is very commonly used in flue gas boiler systems.

 

Details

 

        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 tear at flue gas inlet.

 

Parameter

 

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.

 

 

Functions

 

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.

 

 

 

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.

 

 

Company Introduction

 

        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.

1. Fabrication area of 200,000 square meters
2. 150 Engineers
3. 600 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