Free atmosphere circulation using the storage pressure of liquid nitrogen with high velocity gas injection system.

The high velocity gas injection system CARBOJET® is a new process which can be adapted to heat treatment furnaces with or without a fan. The CFD calculation method has enabled a better understanding of the protective atmosphere circulation in roller hearth and pit furnaces and, at the same time, facilitated an optimized jet design for the respective application. Depending on the particular operation, different advantages can be demonstrated which generate economic benefits and / or quality enhancement. According to cost estimates, savings of well over 100,000 Euro per annum and furnace can be achieved. In general, the consumption of protective atmosphere remains unchanged when this process is applied. Further application possibilities, for example in belt furnaces, are currently in the test phase.