Immersion evaporator

An immersion evaporator is disclosed having, connected to its evaporation vessel, a pipe for feeding a solution to be concentrated by evaporation into the evaporation vessel, a riser pipe for withdrawing the concentrated solution and any crystals from the evaporation vessel, a pipe for withdrawing flue gases and vapors from the evaporation vessel, and an immersion pipe extending vertically inside the evaporation vessel, the upper end of the immersion pipe being connected, by means of an angle joint piece to the outlet of the combustion chamber, there being at the opposite end of the combustion chamber, a burner for liquid or gaseous fuel, the burner having a cylindrical combustion gas turbulence chamber for an oxygen-bearing combustion gas, at one end of which there is a substantially tangential combustion gas inlet conduit and a fuel dispersion pipe extending coaxially into the turbulence chamber, the opposite end of the turbulence chamber being convergent. The tangential combustion gas inlet conduit is connected to a mantle which surrounds the burner and the combustion chamber, there being, at the opposite end of the mantle, a fuel inlet conduit for preheating the fuel, and the convergent end of the turbulence chamber continues into the combustion chamber as a cylindrical leveling conduit coaxial with the turbulence chamber, and the fuel dispersion pipe has at least such a length that it extends to the distance defined by the formula from the inner end of the leveling conduit, in which formula H is the distance between the inlet end of the leveling conduit and the dispersion pipe, alpha is the andle of convergence of the opposite end of the turbulence chamber, d is the outer diameter of the dispersion pipe, and D is the inner diameter of the leveling conduit.