The endothermic gas generator is preferably used in the processing of carbon steels.
To ensure that the production of endogas takes place entirely, it is necessary to have a certain level of heat, which generates the endothermic reaction. The generated gas is normally reducing and cementing ferrous materials.
This endogas production takes place thanks to the passage of a air-methane mixture through reaction towers at 900 ° -1000 ° C filled with nickel catalyst. With the addition of small quantities of hydrocarbons, endogas becomes hyper-fuel and is commonly used in furnaces of different sizes and characteristics.
For processing wires, strips, sheets, etc. with a low carbon content, Exogas is used, obtained through the partial or total combustion of gaseous hydrocarbons and much more competitive from an economic point of view. This combustion process, in fact, which takes place within special reaction towers, produces a protective atmosphere.
Furthermore, this type of gas, in addition to constituting a mixture suitable for the blank solubilization of low carbon content wires, strips, sheets, represents a valid solution for the controlled oxidation of magnetic laminations, when the process is carried out without the condensation of the outgoing water. If, on the other hand, the combustion occurs almost completely, this gas finds application in the bright solubilization of copper.
Dissociated ammonia has applications similar to those of pure hydrogen. However, compared to it, it is less expensive; therefore, it is used for the “white” solubilization of low carbon steels, including stainless steels. It cannot be used in those cases where the nitriding of stainless steels containing titanium and molybdenum can occur.
These applications are possible as the anhydrous ammonia at a temperature of 900 ° thanks to the passage on a catalyst bed, where it dissociates into its gaseous components consisting of 75% H2 and 25% N2.
Dissociated ammonia dryers
The dryers allow to obtain the almost complete absence of humidity in hydrogen-rich atmospheres, using molecular sieves positioned in regenerable absorption columns. The two towers can be heated electrically and independently by resistors and work alternately, cold for drying and hot for the regeneration of the dehydrating substance.
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