Heat Pipe Air Preheater

Design Principles:

The exhaust gas temperature of medium and small industrial boilers typically ranges from 220°C to 380°C, with a heat loss of about 10%. Due to some technical issues in the recovery of waste heat from the flue gas, most of it is not well utilized.

Equipment Advantages and Structural Forms:

       Due to gas/gas heat exchange, both sides utilize finned tubes, resulting in high heat transfer efficiency, up to 5 to 8 times that of a conventional air preheater. Since flue gas is heat exchanged outside the tubes, it is beneficial for dust removal. Each heat tube is an independent heat transfer element, making it easy to dismantle and allowing for free expansion. Through design, wall temperatures can be adjusted, which is advantageous in avoiding dew point corrosion. The heat pipes are vertically positioned, with flue gas and air flowing in opposite directions horizontally to form gas/gas heat exchange, thereby maximizing the heat exchange efficiency of flue gas.

Energy-saving and economic efficiency:

       Tubular air preheaters are used in boilers to increase the boiler air intake temperature to over 150°C, which enhances the full combustion of fuel inside the furnace. This increase in furnace temperature leads to a corresponding reduction in fuel consumption and a boost in boiler thermal efficiency by over 7%, resulting in significant energy-saving and economic benefits.