Originally, thermal oil plants were built exclusively for heat transfer for industrial purposes. For some years now, thermal oil systems have also been used together with ORC modules, which generate electricity and district heating.

Thermal oil systems have some advantages over steam boilers:

We supply thermal oil heaters with a capacity from approx. 5 MWth and combine them with our various flexible Kablitz firing systems. Thanks to our know-how, we are one of the few companies in the world that can also offer thermal oil boilers with waste incineration.

  • They operate at low pressures

  • The thermal oil remains liquid at all permissible temperatures – up to approx. 315°C, depending on the type.

  • They are less maintenance-intensive

  • You do not need a certified boiler operator for operation.

We supply thermal oil heaters with a capacity from approx. 5 MWth and combine them with our various flexible Kablitz firing systems.

We are happy to supply the complete technology for a combined heat and power plant: from the fuel bunker to the chimney, including power generation and heat supply – precisely tailored to your needs.

Thanks to our know-how, we are one of the few companies in the world that can also offer thermal oil boilers with waste incineration.


Volos (Greece) Biomass power station with thermal oil heater Near the Greek port of Volos, a thermal oil heater with an ORC module for power generation was installed for a Greek chemical company.

The combustion system was designed for a variety of agricultural fuels, which means that the plant is well prepared for possible fuel changes in the future. Also helpful for the flexibility of the multifuel plant are the two granulate nozzles with a combined total firing capacity of 10.0 MW, which make it possible to inject and burn the fines of the fuels separately above the grate firing. This prevents the accumulation of dust in the fuel feed and thus significant- ly reduces the risk of dust explosions. At the same time, the granulate nozzles enable shorter reaction times in the event of load changes.

The thermal oil-powered ORC module delivers 5.0 MW of electrical power, which is fed into the local grid. It is not typical for an ORC system that it does not have a heat consumer and is therefore used exclusively for power generation. Nevertheless, Kablitz has managed to build an economical and above all durable and flexible plant.
Menznau (Switzerland) Hot gas generator with thermal oil heater A Swiss producer of wood-based materials was planning Menznau site is responsible for the energy supply of MDF-, and chipboard presses as well as the dryer heating on biomass fired solid combustion to change. The customer was particularly keen to consider future opportunities for development in the the concept of the plant already and to use it as a flexible design.

The system consists of a solids-fired hot gas generator, followed by a thermal oil heater in membrane wall construction, which is strongly reminiscent of a water tube boiler. In the ceiling of the first heater pass is a vertical dust burner which can burn production-related residual materials and optimally cover power peaks.

In the event that the Power generation will be realized via a steam turbine in the future, both the furnace and the thermal oil heater are designed to provide additional energy and heating surfaces for steam generation.
Smorgon (Belarus) Biomass-combined heat and power plant with
thermal oil heater and hot water economiser
At the Smorgon site, Kablitz has set up an energy centre with biomass for LVL plate production. It was particularly important for the customer to consider future development possibilities in the concept of the plant and to design it flexibly.

The system consists of a solid-fuelled thermal oil boiler, whereby the radiation part consists of a membrane wall construction and the convection part of meander-shaped registers. After the combustion process, the flue gases are passed through the thermal oil boiler, where the thermal oil is heated to supply heating to the press and other consumers. With a downstream hot water economiser, the residual heat after the boiler is used as process heat before the flue gases go into the flue gas cleaning system and finally into the chimney.

The new energy centre reliably supplies production around the clock. The modern firing control system automatically adapts the firing capacity to the production requirements so that unwanted fluctuations in output and downtimes are avoided. The combination of grate and dust/granulate firing enables power peaks to be covered quickly and optimally and production-related residual materials to be converted into energy in an environmentally friendly manner, which also significantly improves the CO2 balance.
Incheon (Korea) Waste wood-steam boiler with thermal oil heater The challenge in this project for one of the largest woodbased panel producers in Korea was to recycle production waste from MDF production in a combined superheated steam/thermal oil boiler plant with only one common furnace.

Another special feature of this plant is the watercooled feed grate type 715, which is used due to the very high calorific value of the waste wood.

Kablitz supplied an extremely flexible system. The custo- mer can burn his various production wastes either via the water-cooled grate or the dust/granulate nozzles. The steam boiler supplies live steam for a turbine for energy generation and process heat and the thermal oil boiler supplies thermal energy to two MDF presses via a 300 m long ring line. The customer generates environmentally friendly energy through the energetic utilisation of the residual materials from production. He can produce steam for his power generation as well as hot thermal oil with only one plant, thereby reducing his dependence on oil.

The combination of grate firing and dust/granulate nozzles allows a quick adjustment of the output to fluctuations of the heat consumers.