Thermal Oil Heaters
Type: THZ
   
Thermal Fluid Heaters THZ can be applied in many different fields of high temperature heating e. g.
all forms of appliances, textile machines, autoclaves, vessels, machines or buildings.


Technology
The heat carrier is pumped in a forced circulation - closed circuit - through the heater, the heat
consumers and the connecting pipes. As a result of this system, a defined heat exchange is
obtained on all points of the heating surface. The THZ is a tube boiler which is suitable for
heating of all kinds of heat transfer fluids on mineral or synthetic base.

Design
The THZ is designed as a 3-pass boiler in vertical or horizontal design. The heating surface
consists of two tube cylinders mounted in the gastight boiler casing.
The flue gas is carried in the 3rd pass.

The connection of the cylinders is effected by flow and return collectors. The large dimensions
of the combustion chamber ensures perfect burning conditions and best results in waste gas.

As the parts of the vessel with contact to the flue gas are cooled down - only parts are insulated
with special creep-resistant insulation - fire resistant bricking is not necessary. Operation at ca.
300°C is effected close to atmospheric pressure, at max. 400 °C with an
operating pressure of ca. 12 bar.

Due to operation with common heat transfer fluids THZ are not subject to any corrosion
caused by the heat carrier.

Each THZ is equipped with flow control and safety device system controlling the volume flow.
Thereby damage of the heat carrier and heater is impossible.

We can supply thermal fluid heaters THZ in horizontal or vertical design:

horizontal design
- low costs for maintenance. Burner and fittings can
  be reached easily.
- low total height of construction. The THZ in
  horizontal design can be installed in rooms with
  low roofs.
  
vertical design
- permanent degassing of heat
  transfer fluid. The gas bubbles are
  drifting from the heated to the
  colder parts of the tube - therefore an
  excellent heat transfer is guaranteed.
  The flow follows the  buoyancy.


All types can be obtained in two most
common temperature ranges dt 25°C
and dt 40°C.

THZ thermal fluid heaters can be either fuelled
- directly by the use of light fuel oil, natural gas or electrical resistance heating (E-THZ)
- indirectly by liquids, waste gas, waste heat or steam.

Technical Data/Types of THZ (in vertical or horizontal design)
(Please click this Link to save this
table as pdf file.)

Delivery Standard, Module Design and Accessories
Depending on customer's demands we can deliver the components of THZ in single pieces,
in module design or mounted in standard containers.

  • THZ including all necessary fittings and safety devices, mounted on a frame, including
    low pressure circulation pump in compact design, switchboard, burner -
    on customer's demand.
  • Accessories such as drain tanks, expansion tanks, fill and evacuation (drain) pumps,
    relief vessel, fittings and mountings.
  • Mounted in standard containers: all necessary components of the plant can be
    mounted and pre-wired in a container -     ready for operation.
Construction and Production
Calculation of construction, selection of materials and equipment acc. TRD - German technical
regulations for pressure vessels or PED 97/23/EC.

Production and pressure test under supervision of TUEV - additional calculations and acceptance of constructions by foreign supervision organizations on request.