Increased Heat Absorption by the Walls of Exchangers Sprayed with Coatings Exhibiting High Heat Absorption and Conductivity

TL;DR

This paper introduces a method to select spray coatings for furnace walls and heat exchangers to improve heat absorption and equipment durability.

Contribution

A novel method for selecting spray coatings to enhance heat exchange and protect equipment in industrial settings.

Findings

Spray coatings increase heat absorption and thermal efficiency in laboratory and industrial tests.

Selected coatings extend the service life of heat exchangers and reduce repair costs.

Coatings improve heat transfer between exhaust gases and cooling water in metallurgical installations.

Abstract

The article presents a method for selecting spray coating systems for furnace walls and heat exchangers, aimed at protecting them and intensifying heat exchange processes. Calculations were made of the effect of the mutual emissivity coefficient between the heating medium (exhaust gases) and the surface of the exchanger—both uncoated and coated—on the heat flux value. Selected coating systems were applied in laboratory conditions by spraying them onto the boiler surfaces and then measuring their heat exchange efficiency with the cooling medium (water) flowing through the piping system. The results of the laboratory tests were verified under industrial conditions in metallurgical installations, confirming the accuracy of the calculations and the validity of using spray coatings to increase thermal efficiency. The use of appropriately selected coating systems increases heat absorption, extends the service life of exchangers, reduces the risk of cooling system failure, and lowers the cost of heating equipment repairs.

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