LiquiCore™ High-Temperature Screw Heat Exchanger

20 Nov 2025  |
With the LiquiCore™ Screw Heat Exchanger, Köllemann is redefining the thermal treatment of bulk solids. This revolutionary, electrically heated system overcomes the limitations of conventional units operated with thermal fluids, enabling process temperatures in the range of approximately 230 °C to 600 °C.

Our patent-pending technology, featuring a liquid metal core, achieves a previously unattainable level of efficiency and homogeneity in heat transfer.

The LiquiCore™ Screw Heat Exchanger reliably combines the transport of bulk solids with precise thermal treatment—but at a completely new temperature level and with significantly simplified infrastructure. As a tailor-made solution, it is designed to meet your specific process requirements and manufactured from high-quality, heat-resistant materials.

Your Advantages at a Glance:

  • Process Temperatures up to 600 °C – Unlock new process windows for pyrolysis, calcination, or other high-temperature applications that are not feasible with conventional systems.
  • Maximum Energy Efficiency – Direct electrical heating and the highly conductive liquid metal core minimize energy losses and ensure extremely fast and efficient heat transfer to the bulk material.
  • Greatly Simplified Infrastructure – The LiquiCore™ only requires a power connection. Complex and maintenance-intensive peripherals such as thermal oil heaters, steam boilers, insulated pipelines, and pumps are completely eliminated.
  • Minimized Maintenance – By eliminating thermal fluids, there are no leaks, no fluid degradation, and no complex inspections of pressure vessels. The system is robust and operationally reliable.
  • Sustainable and Eco-Friendly – Operation with (renewable) electricity enables a low-CO₂ process. There are no hazardous thermal oils that require disposal.
  • Precise and Rapid Process Control – Electrical heating allows for exact temperature regulation and fast response times, resulting in consistently high product quality.

How It Works

The heart of the patent-pending LiquiCore™ technology is an innovative design of the screw shaft. Inside the shaft, electrical heating elements are embedded in a hermetically sealed core containing a special, low-melting-point metal.

In its operating state, this metal is in a liquid phase and serves as an ideal heat transfer medium. This property necessitates a minimum operating temperature of approx. 230 °C, at which the system unfolds its full heat transfer capability. Due to its extremely high thermal conductivity, it distributes the energy generated by the heating elements instantly and with absolute uniformity across the entire length and surface of the screw shaft. The bulk material is conveyed by the screw’s rotation, continuously mixed, and comes into intensive contact with the precisely tempered surfaces. Optionally, the trough jacket can also be heated according to the same principle to further maximize heat input.

This principle guarantees a highly efficient and homogeneous heat input that is far superior to conventional systems.

Designs and Customization

Every LiquiCore™ High-Temperature Screw Heat Exchanger is a tailor-made solution that we adapt precisely to your process:

  • Materials: Use of high-temperature resistant stainless steels and special alloys, selected according to temperature and product properties.
  • Geometry: Screw diameter, length, and pitch adapted to the specific process.
  • Trough Design: Available as a tubular or U-trough, optionally heated and insulated.
  • Control Technology: Fully integrated control and regulation technology for precise process management and monitoring.

Fields of Application

The LiquiCore™ technology opens up new possibilities for a multitude of industries and processes in the high-temperature range:

  • Chemical Industry: Pyrolysis, calcination, thermal activation of catalysts, high-temperature reactions.
  • Recycling & Environmental Technology: Pyrolysis of plastics, biomass, or residues (Waste-to-Value), drying of sewage sludge.
  • Energy & Raw Materials: Torrefaction of biomass, processing of ores and minerals.
  • Special Applications: High-temperature drying, roasting, or sterilizing of various bulk solids.

Do you have a demanding thermal challenge? Contact us! Together, we will develop the right process solution based on our innovative LiquiCore™ technology.
 

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Köllemann is technology leader for screw conveyor systems Köllemann GmbH is a medium-sized, highly innovative plant construction company with around one hundred employees in the heart of the Eifel. With an experience of over 50...

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