An air preheater also referred to as a preheater, is a kind of preheating equipment to improve the heat exchange performance of the boiler and reduce heat loss. The function of the air preheater is to carry the heat in the flue gas discharged from the boiler tail flue, and conduct it to the air before entering the boiler through the radiator, and preheat the air to a certain temperature.

Generally, there are two types of air preheaters. One is the welded plate type and the other is the tubular type. Plate-type air preheater has the advantages of high heat transfer efficiency, compact structure, less installation space, easy assembly and maintenance, long service life, and low cost. While the disadvantage of this type is that, when the flue gas contains corrosive elements and the process temperature has to drop to below 130℃， a dew point corrosion problem will occur.

The tubular type can completely avoid the dew point corrosion problem while this type usually requires a much larger heat transfer area and occupies large space for installation.

After years’ experience, we developed a new type that utilizes the advantages of both plate type and the tubular type and at the same time avoids the problem of dew point corrosion and large space occupation. we call it Combined Air Preheater.

This combined air preheater consists of two sections, the high-temperature section in plate type and the low-temperature section in tubular type. 70% of the heat transfer is completed in the high-temperature section. When the flue gas temperature drops to around 130 ℃， it is introduced to the low-temperature section to complete the rest heat transfer process. Tubes in this section can be selected from enamel tubes, glass tubes, and silicon tubes, all of which are completely corrosionresistant.

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