Method for producing a protective atmosphere for heat treating ferrous and non-ferrous metals

摘要

Protective gas for the heat treatment of metals is frequently produced in generators. This type of production is expensive. It is simpler for producing a protective gas to burn a hydrocarbon- containing fuel gas such as natural gas or propane in a jacketed jet tube. This is not possible, however, if the combustion is to be less than stoichiometric, that is to say a sooty endothermic gas is to be produced with an external heat supply. In order to allow the production of protective gas nevertheless in such cases, the combustion is carried out stoichiometrically and a mixture of nitrogen and methanol is sprayed into the combustion chamber (3). In this case, the combustion temperature should not fall below 750 DEG C. IMAGE