Apparatus and method for mixing of corrosive and non-corrosive gas

A mixing device for mixing a first gas with a second gas, the second gas being corrosive to at least part of the mixing device, the mixing device comprising:

• a first gas guiding part having an axis, a first gas guiding inlet part end arranged transverse to said axis and a first gas guiding outlet part end arranged along said axis so that said first gas is introduced into said first guiding part,
• a second gas guiding part having a second gas guiding inlet part and a second gas guiding outlet part, the second gas guiding outlet part arranged within the first gas guiding part and terminating upstream of said first gas guiding outlet part to define a downstream mixing zone so that the first gas and the second gas are mixed in a mixing zone within said first gas guiding part, and
• a guide vane proximal to said first inlet part end and upstream of said second gas guiding outlet part end, said vane arranged and configured so that said first gas impinges said vane and is redirected to establish a swirling motion in the first gas upstream of said mixing zone;
• said guiding vane cooperating with said first and second gas guiding outlet parts to form a protection zone from said first, gas for said first gas guiding part in said mixing zone.