Abstract
The experiment leads to establish the influence of radiated surface
development heat exchangers on the values of heat flux transferred with
water flowing through the exchangers and placed in electric furnace
chamber. The values of emissivity coefficients are given for the
investigated metal and ceramic coatings. Analytical calculations have been
made for the effect of the heating medium (flame) – uncoated wall and then
heating medium (flame) – coated wall reciprocal emissivity coefficients.
Analysis of the values of exchanged heat flux were also realized. Based on
the measurement results for the base coating properties, these most
suitable for spraying the walls of furnaces and heat exchangers were
selected, and determined by the intensification of heat exchange effect.
These coatings were used to spray the walls of a laboratory waste-heat
boiler, and then measurements of fluxes of heat absorbed by the cooling
water flowing through the boiler tubes covered with different type
coatings were made. Laboratory tests and calculations were also confirmed
by the results of full-scale operation on the metallurgical equipment.
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