The burner lance
consists of two concentric tubes, a one-piece nozzle and a sealing nut. The
media supplies are arranged so that the steam is supplied down the centre tube
and the fuel oil through the outer tube. Consequently, the steam space is
completely isolated from the oil space.
The steam atomizer consists of an atomizer body that has a number of discharge
nozzles arranged on a pitch circle in such a way that each oil bore meets a
corresponding steam bore in a point of intersection. Oil and steam mix
internally forming an emulsion of oil and steam at high pressure. The expansion
of this mixture as it issues from the final orifice produces a spray of finely
Oil burners with internal mix steam atomizing are tolerant to viscosity
changes. In addition to this advantage, the steam atomized oil burners have
better turn down, do not require high fuel oil pump pressures, and are frugal
in the use of steam.
Hamworthy internal mix steam atomizing burner
A Hamworthy internal mix steam atomizing
burner at Karlshamn power plant in Sweden.
The power plant has three 340MW boilers, each with 18 burners.