High Temperature Screw Heater
The High Temperature Screw Heater (LiquiCore) is an advanced solution for the thermal processing of bulk solids, designed to outperform conventional thermal oil or steam-based systems. This patented electrically heated screw heater enables reliable operation across a wide temperature range from approximately 230 °C to 650 °C, making it ideal for demanding industrial heating applications.
Unlike conventional systems, the High Temperature Screw Heater uses a specially engineered screw shaft with a hermetically sealed core. Integrated electrical heating elements are embedded in a low-melting metal matrix, ensuring fast, uniform, and highly efficient heat transfer along the full length of the screw. An optional electrically heated trough jacket further enhances thermal performance and process stability.
A key advantage of the High Temperature Screw Heater technology is its fully electric operation, which eliminates the need for heat transfer fluids. This significantly reduces system complexity, maintenance requirements, and the risk of leakage while improving overall operational safety.
With precise temperature control, fast response times, and excellent energy efficiency, the High Temperature Screw Heater delivers consistent product quality and optimized process performance for a wide range of industrial applications.
High Temperature Screw Heater - Benefits
A High Temperature Screw Heater provides an advanced thermal processing solution for heating, drying, pyrolysis, calcination, and activation of bulk solids. Its fully electric heating technology enables precise temperature control, high thermal efficiency, and reliable operation in demanding high-temperature applications.
High Temperature Processing Capability −
Enables controlled thermal treatment of bulk materials at temperatures up to approximately 600–650°C, expanding application possibilities beyond conventional heating systems.
Uniform Product Heating +
Energy Efficient Operation +
Reduced Maintenance Requirements +
Compact Process Solution +
Wide Application Range +
High-Temperature Screw Heater - Features
A High Temperature Screw Heater provides an advanced thermal processing solution for heating, drying, pyrolysis, calcination, and activation of bulk solids. Its fully electric heating technology enables precise temperature control, high thermal efficiency, and reliable operation in demanding high-temperature applications.
- Electric Heated Screw ShaftIntegrated heating elements provide efficient heating.
- Liquid Metal Heat CoreEnsures rapid and uniform heat distribution.
- Hollow Flight DesignMaximizes heat transfer efficiency.
- Precise Temperature ControlProvides accurate and responsive heating control.
- Heat-Resistant ConstructionBuilt for reliable high-temperature operation.
- Custom Engineered DesignConfigured with optional heated troughs, insulation, and custom screw designs.
High Temperature Screw Heater - Technical Specification
Function
High-temperature thermal treatment of bulk solids
Maximum Operating Temperature
up to 650 °C (up to 700 °C when using Alloy 800H)
Capacity (Pilot Plant)
8-22 L/h (residence-time from 8-24 minutes)
Heating Principle
Direct electrical heating
Heat Transfer Medium
Low-melting liquid metal (hermetically sealed)
Heat Transfer Mechanism
Conduction via liquid metal core
Temperature Homogeneity
Excellent (isothermal core)
System Efficiency
approx. 90–95 %
Heating Element
Electric heating rods inside the shaft
Trough Design
Optional: Tubular or U-trough, heatable using same principle
Operating Principle of High Temperature Screw Heater
The heart of the patented High Temperature Screw Heater technology is an innovative screw shaft design:
– Electric heating elements are embedded inside the shaft in a hermetically sealed core containing a special, low-melting-point metal.
– In operating state (from approx. 230 °C), this metal is in liquid phase and serves as an ideal heat transfer medium.
– The extremely high thermal conductivity of the liquid metal distributes energy instantly and uniformly across the entire shaft length.
– The bulk material is conveyed by screw rotation, continuously mixed, and comes into intensive contact with the precisely tempered surfaces
The High Temperature Screw Heater is designed to customer specifications using heat-resistant materials, optimized screw geometries, and integrated control and regulation technology.
The High Temperature Screw Heater is suitable for processes such as pyrolysis, calcination, high-temperature drying, and the thermal activation of solids. A key area of application is the thermal desorption of persistent pollutants (e.g., PFAS), for example in the treatment of contaminated soil, sewage sludge, or the reactivation of loaded adsorbents.
Frequently Asked Questions
An Electric Screw Heater, also known as High Temperature Screw Heater, is an electrically heated screw heat exchanger designed for the continuous thermal treatment of bulk solids. It combines conveying and high-temperature heating in one compact system, enabling precise and efficient process heating.
The Electric Screw Heater uses a specially developed screw shaft with integrated electrical heating elements inside a hermetically sealed core. A highly conductive liquid metal transfers heat evenly along the entire screw shaft, providing fast and homogeneous heating of the conveyed material.
Electric Screw Heater is designed for high-temperature applications and can provide controlled thermal treatment of bulk materials in the range of approximately 230°C to 600°C, extending the operating limits of conventional screw heat exchangers.
An Electric Screw Heater eliminates the need for external heat transfer fluids such as thermal oil. It provides a simpler system design, reduced maintenance requirements, lower risk of leakage, precise temperature control, and fast response times.
Electric Screw Heater is suitable for demanding thermal processes such as pyrolysis, calcination, high-temperature drying, thermal activation of solids, and thermal desorption of contaminants such as PFAS. It can be used for materials including contaminated soils, sewage sludge, and spent activated carbon.
Yes. The Electric Screw Heater can achieve temperatures up to 600°C with homogeneous heat distribution, making it suitable for thermal desorption applications where persistent pollutants such as PFAS need to be transferred into the gas phase for separation.
Electric Screw Heaters can process a wide range of bulk solids, including contaminated soil, sewage sludge, activated carbon, mineral materials, biomass, and other materials requiring controlled high-temperature treatment.
Electric Screw Heater provides homogeneous heat transfer, high process efficiency, accurate temperature control, compact equipment design, and reliable continuous operation. Its fully electric heating concept simplifies plant infrastructure compared with traditional thermal fluid systems.
Yes. Each Electric Screw Heater is customized according to process requirements, including material characteristics, throughput, temperature profile, screw geometry, heat-resistant materials, insulation, and control systems.
