连续镀锌线退火炉氢氮混合站控制

来源期刊：冶金自动化2011年第4期

论文作者：朱竑

文章页码：65 - 68

关键词：镀锌线退火炉； 氢氮混合； 流量控制； 体积分数校正

Key words：annealing furnace in CGL； hydrogen and nitrogen mixture； flow control； content correct

摘    要：在连续镀锌线生产过程中,由于退火炉内氢氮混合气的质量直接影响热镀锌带钢的品质,所以氢氮混合站的可靠性关系到连续镀锌线的正常运行。武汉钢铁集团公司二冷轧连续镀锌线立式退火炉氢氮混合站引进比利时Drever公司技术,对氢氮混合站采用4种控制模式,在不同的工况下各模式间采用相应的切换顺序。系统通过对H₂和N₂流量的精确控制,使得混合气中H₂体积分数稳定在工艺要求的5%,其控制精度保持在±0.1%以内。本文介绍氢氮混合站的过程控制流程,PLC系统构成和主要控制功能的实现。

Abstract: In production process of CGL,quality of mixed gas with hydrogen and nitrogen in annealing furuace affects quality of hot galvanized steel strip directly,and reliability of hydrogen and nitrogen mixed station relates to normal operation of CGL.Hydrogen and nitrogen mixed station of annealing furnace for CGL of No.2 Cold Rolling Mill in Wuhan Iron and Steel Group Corporation was imported from Drever,Belgium.Four control modes are applied to the mixed station.Control modes can be switched over in appropriate order under different conditions.Through precise control of hydrogen and nitrogen flow,content of hydrogen in mixed gas can be controlled within 5%,and control accuracy is within ±0.1%.Process control flow of hydrogen and nitrogen mixed station,architecture of PLC system and main control functions are describd.