The invention provides a composite additive based on 2, 6-
butylated hydroxytoluene,
phosphate fire-resistant oil and application, the composite additive is a mixture of 2, 6-
butylated hydroxytoluene and Revonox 501, the addition amount of 2, 6-
butylated hydroxytoluene is 0.01%-0.10%, the addition amount of Revonox 501 is 0.0020%-0.0050%, the addition amount of 2, 6-butylated hydroxytoluene is 0.01%-0.10%, the addition amount of 2, 6-butylated hydroxytoluene is 0.0020%-0.0050%, and the addition amount of 2, 6-butylated hydroxytoluene is 0.01%-0.10%. After the
phosphate fire-resistant oil is added with the composite additive, the comprehensive performance of the
phosphate fire-resistant oil in the operation process can be improved, and the defects that after new phosphate fire-resistant oil is loaded into a
system, the action flexibility of a
steam turbine assembly is reduced and a
servo valve of a speed regulating
system is corroded and jammed due to the phenomena that the
acid value is increased, the resistivity is reduced,
oil sludge is generated and the like in the use process are overcome; and the
operation safety of a
turbine set of a power
plant is influenced.