Fossil fuel-fired once-through flow stream generator

A once-through flow steam generator, comprising:

• burners for a fossil fuel;
• an inlet header;
• an outlet header;
• a vertical gas flue including substantially vertically disposed tubes for channeling steam, said substantially vertically disposed tubes each having inlet ends being connected to said inlet header and, said substantially vertically disposed tubes each having outlet ends being connected to said outlet header and said outlet ends delivering the steam to said outlet header with a specified temperature;
• said vertical gas flue having a lower end and said burners being disposed in said lower end for heating said substantially vertically disposed tubes;
• a pressure-equalization vessel;
• pressure-equalization tubes each branching off from a respective one of said substantially vertically disposed tubes at a branching-off point above said burners and at a same height, said pressure-equalization tubes being connected to said pressure-equalization vessel;
• and
• said height of said branching-off point of each of said substantially vertically disposed tubes is chosen such that it is ensured that the geodesic pressure drop in said substantially vertically disposed tubes is at least a multiple of a pressure drop due to friction in said substantially vertically disposed tubes.