Water and steam are typically used as heat carriers in industrial heating systems.
In industrial heating systems a high temperature level is often a necessity for achieving the required high efficiency. When using steam or pressurized water these high temperatures correspond very high operating pressures. Such pressurized steam or water systems can be very controversial and expensive, however that has been the situation for centuries - and has thus been general accepted to deal with - technically and economically.
Today there are alternatives - high temperatures does not need requiring high pressure!
In thermal fluid heaters a special oil are instead as heat carrier, operating at atmospheric pressure up to 300°C. For comparison this to water and steam, it would require a pressure of 85 bar to obtain this temperature.
The safe system
correct and safe system design is very important for any high temperature
system. This is ensured by using only experienced suppliers for the
heaters and accessories - and the contractors for
building up the whole system on site. The engineers specializing in
thermal oil systems, knows about all those details - the features,
updated technical knowledge of possibilities, options, but also the
threats particular when dealing with these high temperature process
There are several
advantages by using thermal fluid compare to e.g. steam systems.
The most obvious advantages are:
Thermal fluid heaters can be delivered in horizontal execution (with low height), or in vertical execution (occupying limited floor space). They are delivered insulated with stainless steel cover sheets and complete with burner, armatures, instrumentation, safeties and a control panel - and with full documentation including necessary certificates.
heaters are made with coils made of seamless tubes. The thermal fluid is
heated during the flow through the tubes. The heat is transferred to the
fluid as radiant heat in the combustion chamber, where the inner
cylindrical tube coil and a flat tube coil forms the chamber wall and
the bottom respectively. Consequently refractory concrete is avoided.
The combustion gasses are hereafter cooled in the outer convection part,
as the gasses pass the space between the two tube coils.
The heater and the thermal fluid system in whole are constructed and equipped according DIN 4754 and are CE-marked. Pressure vessels according PED 97/23/CE, AD-Merkblätter 2000 (and corresponding EN norms).
Beside the standard execution the heaters can be delivered in e.g.