The functional mechanism regarding fuel oil additives of three kinds

namely EC-2（F）

E-8500

and B-2300

have been briefly presented

and their influence upon fuel oil’s properties

boiler’s hot performance

resistance of boiler’s heat recovery surface

and temperature of exhaust gas

being tested. The test results show that all three kinds of said additives can’t distictly change the calorific value

density

viscosity

and elemental components of the fuel oil

but having certain positive effects for improving combustion of oil-fired boilers

and for decreasing pollution caused by the exhaust gas. Especially additive EC-2（F） has comparatively outstanding efficacy.