Boiler plant for heat generation

A boiler plant for heat generation comprising:

• a combustion chamber;
• a premix burner, said premix burner acting on the upstream side of the boiler and configured and arranged for operation on liquid and/or gaseous fuel, said premix burner including at least one region where combustion air is introduced and means for inducing aerodynamic flame stabilization by vortex breakdown and the formation of an inner backflow zone within said combustion chamber, said means positioned adjacent to said region where combustion air is introduced into said premix burner;
• at least one diaphragm-shaped means within said combustion chamber dividing said combustion chamber into an upstream part and a downstream part, said diaphragm-shaped means forming a downstream limitation of said inner backflow zone within the upstream part, said diaphragm-shaped means forming outer backflow zones fed by recirculating flue gases;
• and
• wherein said inner backflow zone and said outer backflow zones are locally separated from each other.