UNIVERSAL High-pressure steam boiler ZFR

The result:
Flexible output for fluctuating steam demand; Sturdy, reliable and unparalleled service life; Economical and low emissions; High pressure stability; High steam quality for demanding users; Stable under peak- and low loads; Individual burner operation/control, TÜV-approved for decades; Double control range with efficiency gain; For all burner systems, also NOx-reduced; Stable water circulation and rapid heat transfer; Easy operation and maintenance; Maximum service availability and safety; Superheated steam from superheater module, suitable for dry start; Superheater as water separator with uncontrolled superheated steam temperature; Superheater with constant controlled superheated steam temperature over a wide load range

The application profile:
Industrial establishments with a large heat requirement and distribution network in the food, beverages, textile, building materials, chemicals, ceramics and paper sectors; service establishments, municipalities, ...

The design:
The company Three-Pass patent from the year 1952 forms the basis for the outstanding and so far unsurpassed success of this series. The special design measures which neutralize the tensile forces in single flame-tube operation are decisive for long-term stability.

The flame tubes are inserted through the complete thickness of the front and rear ends and firmly welded all round their circumference. The wet-back rear furnace gas reversing chamber is separated by a water-carrying, stabilizing furnace wall and also inserted through the rear end. The large pressure relief surfaces with all-round ligaments, together with the reversing chamber ceiling-to-floor bracing, neutralize the stresses. Water circulation and heat transfer are effectively assisted by guide sections on the boiler floor and are further accelerated by flow passages between the flame tubes and the side-by-side smoke tube sections.

Superheated steam is generated with superheater modules which are attached to the front reversing chamber. Using bypass dampers, the superheated steam temperature can be kept constant over a wide load range. An economizer is simply placed on top of the flue gas collecting chamber and does not require an additional foundation. The swiveling reversing chamber doors keep the smoke tube sections freely and easily accessible. The high-quality mineral wool mat insulation of the entire boiler body and the superheater module ensure that radiation heat losses are insignificant. The sturdy base frame reduces the specific ground pressure.

The single flame tube operation permitted by the TÜV (German technical inspection association) allows unrestricted fully automatic operation with one or both burners.

The control range is doubled and each low-load phase is run with one burner with a gain in efficiency. With dual burners, a fuel changeover without boiler shut-down and parallel operation with different fuels are possible.