VORRICHTUNG ZUM REINIGEN VON SCHWEFEL- UND STICKSTOFFHALTIGEN RAUCHGASEN

摘要

The invention relates to a method and apparatus for the purification and recirculation of gases which are fed to a plant for the production of metal powder or for compacting metal powder at elevated pressures. The operating gas exits the plant at a lower pressure and is conveyed in a closed loop, in which filters are provided for the mechanical and/or chemical purification of the gases as well as means for increasing the pressure of the purified gas. The repressurization of the operating gas is carried out economically by liquefying the operating gas leaving the plant after purification by the application of liquid nitrogen, then feeding the liquefied gas to an evaporator via a high-pressure pump, and finally returning the operating gas to the plant in a pressurized gaseous phase.