Enamelling method of enamel heat transfer element

Abstract

The invention discloses an enamelling method of an enamel heat transfer element, comprising the following steps of: (1) preparing enamel frit for later use; (2) making an electrostatic enamel powder which can be sprayed by the use of an electrostatic spray gun; (3) making glaze slip which can be used for wet spraying; (4) spraying the glaze slip obtained from the step (3) on the heat transfer element's grooves and slots which are not easy to spray by an electrostatic dry method; (5) drying the heat transfer element sprayed by the step (4), sending the dried heat transfer element into an electrostatic spraying device, and spraying the electrostatic enamel powder by using the electrostatic spray gun; (6) sending the heat transfer element which has undergone the above steps into a high temperature enamelling kiln for sintering, and cooling to obtain enamel heat transfer element with anticorrosion performance. According to the workpiece sprayed by the enamelling method of the enamel heat transfer element, enamels are greatly wrapped by edges after sintering. In addition, the grooves of the heat transfer element are greatly coated with enamel. The enamelling method is suitable for various shapes and wave patterns.

Description

technical field [0001] The invention relates to an enamelling method, in particular to an enameling method for an enamel heat transfer element. Background technique [0002] Heat exchange enamel elements are currently mainly used in flue gas desulfurization, denitrification devices, and air preheaters of various thermal power plants. Due to the heat exchange efficiency issues involved, the enamel heat exchange elements will not be purely flat plates, but will be fabricated Plates with various wave modes, and the existence of these wave modes, put forward various requirements for the choice of enamel coating method. [0003] Enamel is a metal coated with one or more layers of inorganic vitreous materials on its surface. After high temperature, the surface coating is melted, so that complex physical and chemical changes occur, and the metal and its surface coating are firmly combined to form a kind of enamel. Composite material, which has both the mechanical strength and easy...

AI Technical Summary

Problems solved by technology

The use of electrostatic dry spraying process can well wrap the edge of metal parts with enamel glaze. This is because of the Faraday effect of the electrostatic field. There will be relatively dense electric lines on the raised parts and edges of the workpiece, but it is also Because of this Faraday effect, the power lines will be relatively sparse at the groove of the workpiece (heat exchange element), forming a Faraday cage, which makes it difficult to apply enamel to the groove, resulting in defects here