Acetylene was pyrolyzed in a thermogravimetric reactor system under the vacuum carburizing conditions of steel. The products of pyrolysis were collected and analyzed by gas chromatography. The reactor was numerically simulated by using a detailed reaction mechanism. Sensitivity analysis and reaction flow analysis was performed under the investigated conditions to identify important reaction steps. The comparison of experimental and modeling results is discussed in this paper.
The operation of vacuum carburizing plants suffers from the production of unwanted byproducts like tarry hydrocarbons and soot. In order to identify mechanisms which influence the amount and the composition of these byproducts, the pyrolysis of commonly used gaseous hydrocarbons has been investigated under the conditions of vacuum carburizing of steel. Purposely, this investigation included a close look at the interaction of the pyrolysis reactions in the gas phase with the surface reactions leading to the carburization of the steel. Simulation results for the homogeneous pyrolysis of acetylene under vacuum carburizing conditions obtained with our own model are compared with measurements and with results received with commercially available modeling tools. Furthermore, experimental results of the vacuum carburizing of steel are presented and compared with simulation results. The paper focuses on the applicability of the own model and of commercial software tools for process simulation required for optimizing the vacuum and low pressure carburizing of steel.
Kurzfassung
Die bei der Niederdruckaufkohlung von Stahl im Ofenraum und an der Stahloberfläche ablaufenden Pyrolyse- und Aufkohlungsvorgänge sind bisher nur zum Teil verstanden. Am Engler-Bunte-Institut wird vor allem unter dem Gesichtspunkt der Minimierung der Aufbauproduktbildung und des Verständnisses der Entstehung höherer Kohlenwasserstoffe die Aufkohlung mit verschiedenen kurzkettigen Kohlenwasserstoffen untersucht. Im Rahmen des vorliegenden Artikels wird die Modellierung des homogenen Pyrolyseverhaltens von Ethin unter den Bedingungen des Niederdruckaufkohlens von Stahl vorgestellt. Mit einem formalkinetischen Modell für die homogene Ethinpyrolyse können die in verschiedenen Laborapparaturen ablaufenden Pyrolysereaktionen über einen weiten Versuchsparameterbereich, unter Bedingungen nahe denen industrieller Anlagen, zuverlässig beschrieben werden.
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