Linn, Germany
Linn, Germany

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Patent
Clariant and Linn High Therm GmbH | Date: 2015-02-27

A heating device for producing carbon fibers from a thread-shaped fiber starting material, wherein the heating device has a central tubular induction heating element through which the fiber starting material is moved. The tubular induction heating element is surrounded by thermal insulation. At least one mid- to high-frequency induction coil is provided outside the thermal insulation, and an inert gas flows through the central induction heating element, in particular, for carbonizing and/or graphitizing the fiber starting material. For energy optimization, a first and a second tube element is provided on the outer side of the thermal insulation. The elements are made of material that is transparent to the induction field of the mid- to high-frequency induction coil and are spaced apart from one another by an annular gap through which the inert gas flows.


Li Y.,TU Bergakademie Freiberg | Uhlig V.,TU Bergakademie Freiberg | Trimis D.,Karlsruhe Institute of Technology | Ray S.,TU Bergakademie Freiberg | Wubben P.,Linn High Therm GmbH
ZI, Ziegelindustrie International/Brick and Tile Industry International | Year: 2015

The article describes a numerical methodology for modelling the complete firing process in an industrial furnace. A three-dimensional model based on the finite volume method is presented and applied to the process. The homogeneity assumption "porous medium" is used to simplify the size of the computational domain and the required computational time. The effective properties of the porous model body are calculated and transferred to the simulated structures. The temperature profile in the furnace and the temperature distribution in the stacks can be calculated with the use of this model in an acceptable time. The numerical results are compared with experimentally measured values. A good agreement is found.


Li Y.,TU Bergakademie Freiberg | Uhlig V.,TU Bergakademie Freiberg | Trimis D.,Karlsruhe Institute of Technology | Ray S.,TU Bergakademie Freiberg | Wubben P.,Linn High Therm GmbH
Gaswaerme International | Year: 2014

The article describes a numerical methodology for modeling the complete firing process in an industrial furnace. A three-dimensional model based on the finite volume method is presented and applied to the process. The homogeneity assumption "porous medium" is used to simplify the size of the computational domain and the reguired computational time. The effective properties of the porous model body are calculated and transferred to the simulated structures. The temperature profile in the furnace and the temperature distribution in the stacks can be calculated with the use of this model in an acceptable time. The numerical results are compared with experimentally measured values. A good agreement is found.


The rotary tube furnace combines, in most cases, the expectations of today of a modern continuous heat treatment furnace - high throughput, energy efficiency, easy automation and a reliable reproducibility. Today a number of applications can be realized by the use of high performance materials for the rotary tube. The various operational possibilities of rotary tube furnaces were recently extended by applications for the production of rare earth minerals and high purity quartz sand.


Windsheimer H.,Linn High Therm GmbH | Waitz R.,Linn High Therm GmbH | Wubben P.,Linn High Therm GmbH
Elektrowaerme International | Year: 2015

This article presents current developments in the field of induction cold crucible melting. Recent applications for melting of reactive metal alloys as well as their technical implementations in laboratory and semi-industrial scale cold wall crucible melting furnaces are presented by Linn High Therm (LHT).


Imenokhoyev I.,Linn High Therm GmbH | Wubben P.,Linn High Therm GmbH
Elektrowaerme International | Year: 2014

Since approx. 50 years microwave heating has been available for industrial use. For showing the advantages of this technique, the theory of microwave heating will be explained and the practical application will be demonstrated with some selected examples. The recent article gives an overview of the possible kinds of industrial microwave heating and the advantages of it against conventional heating.


Imenokhoyev I.,Linn High Therm GmbH | Windsheimer H.,Linn High Therm GmbH | Waltz R.,Linn High Therm GmbH | Kintsel N.,Linn High Therm GmbH | Linn H.,Linn High Therm GmbH
CFI Ceramic Forum International | Year: 2013

For approximately 50 years, microwave heating technology has been used in industry. In order to outline the advantages of this technology, the theory of microwave heating is presented in detail. In addition, the practical effects are shown by selected examples. Microwave heating devices meanwhile exist in many different designs. Despite the classic chamber system like microwave ovens in kitchens, microwave heating is also used in industrially continuously operated drying and heating furnaces. Long-time experience in microwave area and innovative ideas are the basis of LINN HIGH THERM's microwave furnaces. This article shall give an overview of currently available types of industrial low- and high-temperature microwave heating furnaces. The drying- and heating-processes which are possible with these furnaces are as diverse as in the conventional thermoprocessing technology. Microwave heating can often accelerate significantly the drying respectively heating process and thus can safe time, energy and money.


Waitz R.,Linn High Therm GmbH | Wubben P.,Linn High Therm GmbH
Elektrowaerme International | Year: 2010

In the following article, various types of furnaces for heat treatment of materials under inert gas and vacuum will be described. An introduction to the theory of inert gas/vacuum treatments is given. Different types of furnaces are described in their principal structure and in their most important applications. Necessary safety devices for the working with combustible and explosive gases are also mentioned.


Windsheimer H.,Linn High Therm GmbH | Waitz R.,Linn High Therm GmbH | Yukhno V.,Linn High Therm GmbH
CFI Ceramic Forum International | Year: 2014

The present article describes the basic approaches to Rare Earth Elements (REE) as well as U02/ThO2 processing and reflects the implementation of the involved technological necessities for selected heat treatment steps during REE and U0.

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