UNIVERSAL Steam Boiler ZFR, ZFR-X

Our three-pass patent dating from 1952 forms the basis for the outstanding and ongoing success of this series. Its suitability for unrestricted parallel or Single burner operation is not only due to the stable separation of the components on the flue gas side. The special design features for neutralising the tension forces in single-flame operation are also critical for ensuring long-term stability. The flame tubes are continuous in the front and rear floors and welded securely all around. The water-flushed rear flue gas reversing chamber is divided by a stabilising tube wall through which water flows. It is fastened to the rear floor. Water circulation and heat transport are powerfully enhanced by means of guide profiles on the boiler base, and additionally accelerated by flow gases between the flame tubes and the smoke tube areas lying adjacent to one another.

Fully automatic operation with one or both burners is possible without restriction due to the approved single-flame operation. Even using different fuels in the two firing units does not present any barriers. This enables the control range to be doubled and means that each low-load phase runs with one burner and a consequent gain in efficiency.

If superheated steam is required instead of saturated steam, a superheater module can be positioned on the front reversing chamber. A bypass valve constantly controls the temperature of the superheated steam over a large load range. The smoke tube areas remain easily accessible thanks to the pivoting door of the reversing chamber.