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本文叙述对空分氮除氧净化工艺的改进,将加氢除氧的催化剂—钯型分子筛处于特定的床层温度下工作,有效地解决其吸水失活问题,成功地创立了钯型分子筛不再生二级加氢连续除氧的先进工艺流程。按该工艺流程设计的净化装置所生产的氮基气氛含过剩H_25—2％,残余O_2≤5PPM,露点低于-60℃。用作低、中、高碳钢、铬锰硅钢、硅锰弹簧钢等冷轧钢板的热处理保护气体,处理后钢板表面光亮,无氧化,无脱碳。
This article describes the improvement of air separation and nitrogen deoxidation purification process, the hydrogenation and deoxygenation catalyst - palladium molecular sieve at a specific bed temperature to work effectively solve the problem of water absorption and deactivation, the successful establishment of a palladium-type molecular sieve Regeneration of two hydrogenation advanced oxygen advanced process. The nitrogen-based atmosphere produced by the purification device designed according to the technological process contains excess H_25-2%, residual O_2≤5PPM and dew point lower than -60 ° C. For low, medium and high carbon steel, chrome manganese silicon steel, silicon manganese spring steel and other cold-rolled steel heat treatment shielding gas, treated steel surface bright, non-oxidation, no decarburization.