Our patented three-pass technology, dating back over 50 years, forms the basis for the outstanding and ongoing success of the UNIVERSAL ZFR steam boiler series. Its suitability for the single or parallel operation of the firing units is due to both the stable separation on the flue gas side and the special design measures for neutralising the tension forces in single-flame operation. The flame tubes are pushed through and are welded tightly to the front and rear floors. The wet-back rear smoke gas reversing chamber is separated by a tube wall which is fastened to the rear floor and has water flowing through it. Water circulation and heat are efficiently transported by means of guide profiles on the boiler base, and are additionally accelerated by the flow gases between the flame tubes and the smoke tube areas alongside one another.
A fully automatic operation with one or both burners is made possible without any restrictions due to the approved single-flame operation. Different fuels in both firing units do not present any barriers. The control range is doubled and each low load phase is run with one burner to provide an improved efficiency level.
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.
- Modular system, controlled on the flue gas side - no injection water required for temperature control of the superheated steam
- Easy maintenance and installation - simple cleaning of the second and third boiler pass
- Long service life thanks to low thermal loading of the heat exchanger bundle of the superheater