Three laboratory methods for research-testing (RT) of fuel oil (FO) droplet combustion with important practical applications are proposed. At the beginning, was established the combustion physical model for droplet flame infrared thermography (FIRT) use. Thus an FIRT method for RT of a burning fuel oil droplet (FOD) is obtained, giving new criteria for determination of gas oil (GO) combustion quality. Also resulted a graphologic-thermographic method (GTM) for RT of FOD combustion, founded on imagining processing of obtained experimental results, by combustion oscillogram (COS) and flame infrared thermogram (FIT), with important application.

Keywords: Combustion graphology, Infrared thermography, Energy saving, Research-testing, Boiler industrial applications.