The heat exchange part is an enamel product made by placing multiple groups of enamel corrugated plates and positioning plates in a box, compacted with a certain pressure and welded into one. It is used for air preheater, flue gas desulfurization and denitration, mainly used in boiler equipment in thermal power generation and petrochemical fields. The heat exchange part adopts decarburized cold-rolled steel for enamel with thickness of 0.5~0.8mm and width of 300~1100mm.

Enamel heat exchange parts can be enamel coated either dry or wet, depending on the size of the enamel part and the enamel coating equipment of the production plant, no matter which is a one-time enamel coating.

(1) Wet coating

Pretreatment: In addition to conventional alkaline degreasing, ultrasonic degreasing can also be used for pretreatment of heat exchange parts. Nickel coating on the metal body can effectively increase the adhesion strength of the product, reduce the pinhole rate, and reduce the sintering temperature of the heat exchange part;

Preparation of enamel slurry: The enamel slurry required for wet enamel coating is made by mixing and grinding 2~3 kinds of enamel frits with different melting values ​​and expansion coefficients.

Enameling and dipping: Whether it is manual dipping or mechanical dipping, the encapsulation rate of the edge of the porcelain layer will be lower, and it needs to be manually rolled after the product is dried.

Wet electrostatic spraying for enamel: see the following table for technical parameters

(2) Dry powder electrostatic spraying: see the following table for technical parameters

Firing: The firing equipment adopts U-shaped or uploading tunnel furnace, mainly gas radiant tube furnace and electric furnace, and the temperature difference in the furnace is controlled at ±5℃.