METHOD OF SHIELDED ARC ATMOSPHERE PREPARATION Russian patent published in 2008 - IPC C01B3/02 B01J7/00 C21D1/76 

FIELD: technological processes.

SUBSTANCE: inventions may be used for preparation of shielded arc atmospheres, which contain nitrogen with hydrogen or nitrogen with hydrogen and carbon oxide that are used in glass, metallurgical, machine building industries. The first variant of shielded arc atmosphere preparation includes conversion of hydrocarbon gas, steam conversion of carbon oxide, cooling of conversion products with separation of condensed moisture and final purification of gas mixture from carbon dioxide and moisture at adsorption plants. Conversion of hydrocarbon gas is carried out in three stages: the first stage is carried out in free volume of device for oxidation of hydrocarbon gas with air; the second stage is carried out in volume of device that is filled with granular fire-resistant material for performance of steam and carbon-dioxide conversion of remaining hydrocarbon gas; the third stage is carried out in volume of device, which is filled with heat-resistant metal rings for saturation of gas flow with moisture and performance of steam conversion of carbon oxide. The second variant of shielded arc atmosphere includes conversion of hydrocarbon gas, steam conversion of carbon oxide, cooling of conversion products with separation of condensed moisture and final purification of gas mixture from carbon dioxide and moisture at adsorption plants. At that catalytic conversion of carbon oxide is regulated by amount of water vapors condensate, which is supplied into volume of device that is filled with heat-resistant metal rings for saturation of gas flow with moisture. The third variant of shielded arc atmosphere includes conversion of hydrocarbon gas, steam conversion of carbon oxide, cooling of conversion products with separation of condensed moisture and final purification of gas mixture from carbon dioxide and moisture at adsorption plants. At that part of hydrocarbon gas conversion products is sent to cooling device, bypassing device of steam conversion of carbon oxide, and further to adsorption purification unit in order to maintain preset content of carbon oxide in shielded arc atmosphere.

EFFECT: inventions allow to intensify the process and to prepare shielded arc atmosphere of triple composition.

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