In the field of heat treatment with protective atmosphere, many furnaces are operated with fans and without atmosphere circulation. For most of the thermo-chemical processes which take place here, a good gas exchange in the immediate vicinity of the component surface is essential. CARBOJET® is a CFD optimised high velocity gas injection system with which this exchange can be implemented without additional energy or involved system modifications. The technology, for which Linde Gas has submitted a patent application, can partly replace existing fans. In most heat treatment facilities, nitrogen is already available at a sufficiently high pressure. In an optimised process, this pressure is converted to produce a strong circulation in the furnace using specially designed jets. This article will describe the experiences and results which were ascertained for different heat treatment processes based on example applications in pit, rotary retort and roller hearth furnaces; related CFD calculations will also be discussed. Since its launch, this novel process technology has been continuously developed, directly in existing production facilities and, at the same time, optimised with the aid of CFD calculation methods.
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