Plate air preheater with fully-glass-lined channel

Abstract

The invention discloses a plate air preheater with a fully-glass-lined channel. The plate air preheater comprises multiple plate pipes, a pair of first supporting bases and a pair of second supporting bases, wherein each plate pipe is formed by welding a pair of sheets, glass-lined coatings are arranged on the inner side and outer side of each plate pipe respectively, the first supporting bases are located on the front side and rear side of the multiple plate pipes respectively, the two ends of each plate pipe penetrate through through holes in the first supporting bases respectively, and sealing is achieved between the outer wall of each plate pipe and the corresponding through holes through sealant; the second supporting bases are located on the left side and right side of the multiple plate pipes respectively, the front end and rear end of each second supporting base are connected with the first supporting bases through fasteners respectively, connecting portions are sealed through sealant, and glass-lined coatings are arranged on the inner surfaces of the first supporting bases and the inner surfaces of the second supporting bases respectively. The plate air preheater has the advantages of being resistant to dew point corrosion, convenient to manufacture, good in sealing performance, convenient to install and maintain and the like.

Description

technical field [0001] The present invention relates to heat exchangers, and more particularly to plate air preheaters. Background technique [0002] Boilers and heating furnaces are the main energy-consuming equipment for production equipment in electric power, petrochemical and other industries. With the increasing shortage of energy, it is imminent to improve the thermal efficiency of boilers and heating furnaces to significantly reduce the energy consumption of equipment. It is the most important measure to improve the thermal efficiency of boilers and heating furnaces to recover the waste heat of flue gas. Due to its compact size and high heat transfer efficiency, the plate air preheater has been widely used in low temperature waste heat recovery. But when the flue gas temperature drops below the acid dew point temperature, the SO in the flue gas 2 and SO 3 Acidic water will be generated, which will corrode and damage the metal heat exchange elements of the air prehe...

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Problems solved by technology

But when the flue gas temperature drops below the acid dew point temperature, the SO in the flue gas 2 and SO 3 Acidic water will be generated, which will corrode and damage the metal heat exchange elements of the air preheater. Even if corrosion-resistant stainless steel is used, the corrosion rate is only slightly delayed, and the service life is still not long

In order to resist acid dew point corrosion, there are plate air preheaters using corrosion-resistant materials as heat exchange plates, such as glass plates, enamel steel plates, etc., but the connections between the plates are bolts, and the seals between the plates are Gasket or sealing strip, due to heat deformation during operation, there will be leakage of smoke or air

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