A horizontal air preheater is a specific type of tubular air preheater layout. Here’s a more detailed description:
Appearance:
The horizontal air preheater is rectangular in shape. It primarily consists of tube bundles, tube sheets, and an outer shell.
The tube bundles, made up of multiple thin-walled steel tubes, are typically arranged horizontally, with both ends welded to the tube sheets.
The tube sheets secure the tube bundles in position.
The outer shell encloses the entire preheater, creating a relatively sealed space that directs the flow of flue gas and air along the designed path.
Components:
- Tube Bundle. It is the core component for heat transfer. The heat from the flue gas is transferred through the walls of the tubes to the air flowing inside.
- Tube Sheets. Located at both ends of the tube bundle, they are used to fix and support the tube bundle, ensuring the stability of the steel tubes.
- Shell. The shell protects the internal components and guides the flow of flue gas and air, preventing heat loss and keeping out external impurities.
- Inlet and Outlet Flue Ducts. These ducts connect to the boiler’s flue and the air supply system, ensuring that flue gas and air can enter and exit the air preheater smoothly.
- Sealing Devices. To prevent leakage of flue gas and air during flow, sealing devices are installed at various connection points in the air preheater, as well as at the junctions between the tube bundle and the tube sheets.
Functions:
- Enhancing Combustion Efficiency. By recovering heat from the flue gas at the boiler’s exhaust, the air entering the boiler is preheated, raising its temperature. This high-temperature air aids in quicker ignition and stable combustion of the fuel, minimizing losses due to incomplete combustion and boosting combustion efficiency.
- Lowering Flue Gas Temperature. By utilizing the residual heat from the flue gas to warm the incoming air, the temperature of the boiler’s exhaust gases is reduced, leading to lower heat loss and improved thermal efficiency of the boiler.
- Improving Boiler Operational Economy. Both enhanced combustion efficiency and reduced flue gas temperature help decrease fuel consumption, lower operational costs, and improve the overall economic efficiency of boiler operation.
Working Process:
The high-temperature flue gas produced by the boiler enters the air preheater through the flue gas inlet, where it flows across the outer surface of the horizontally arranged tube bundle. As the flue gas passes through, it transfers heat to the tube walls.
The air inside the tubes enters the air preheater through the air inlet, where it absorbs heat from the tube walls, gradually increasing in temperature.
The heated air then exits through the air outlet and is directed to the boiler’s combustion system to support combustion.
The cooled flue gas exits through the flue gas outlet and is either sent to the next stage of the flue gas treatment system or discharged through a chimney.
Throughout the process, the flue gas and air exchange heat via the tube walls but remain in separate, independent flow paths without mixing directly.
About Us
Shandong Bokk Tech is dedicated to solve the problem such as ash blockage, corrosion and excessive exhaust gas temperature in the tubular air preheater of small and medium-sized boilers. We primarily manufacture automatic cleaning devices for tubular air preheaters and corrosion-resistant heat pipes. Our products are widely used in the thermal power plants, chemical plants, new energy sector, etc.
We offer customized services to customers around the world, allowing us to adjust product dimensions and other specifications based on your specific needs, to improve air preheater heat efficiency.
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