RH真空槽高效顶枪烘烤技术的研究与应用.pdf

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1、2013No．6重型机械·17·RH真空槽高效顶枪烘烤技术的研究与应用吴建龙，方杞青，张明，贾涛，曹永恒，赵锋辉(中国重型机械研究院股份公司，陕西西安710032)摘要：在烘烤盖+多功能顶枪的RH真空槽烘烤工艺中，多功能顶枪烘烤时存在诸多问题：燃气比例匹配失调、燃气流量控制系统PID参数整定困难、定枪位烘烤且枪位不合理和氮气保护气体使用不当。这时常导致安全事故、耐材烧损与开裂严重、燃气耗费量较大、设备机械性能下降、维修率提高等不利现象发生。为此，中国重型机械研究院股份公司从燃气混合技术、PID流量调节技术、多串级闭环烘烤控制技术、变时长变流量多枪位循环加热技术和氮气保护技术等多方面进

2、行研究，总结出新型RH真空槽高效顶枪烘烤技术。并应用于国内某钢厂的120tRH真空槽烘烤工艺，生产顺利，作业率高，成本低，使用效果良好。关键词：RH真空槽顶枪烘烤；燃气混合燃烧；PID流量调节；多串级闭环烘烤控制；多枪位循环烘烤中图分类号：TG769．4文献标识码：A文章编号：1001—196X(2013)06一o017—06Developmentandapplicationofthehighly-eficienttop-lancebakingtechnologyforRHvacuumchamberwUJian—long，FANGQi-qing，ZHANGMing，JIAtao，CA

3、OYong-heng，ZHA0Feng—hui(ChinaNationalHeavyMachineryResearchInstituteCo．，Ltd，Xi’an710032，China)Abstract：IntheheatingprocessesofRHvacuumchamberbythefiringcover+MFBlance，especiallywhileMFBlanceheating，therearefrequentlysomeimproperprocesses，suchasthemissratioofburninggases，thedifficultPIDparameter

4、tuningforgasesflowcontrol，thelancefixedandimproperheatingposition，theunsuita-bleuseofshieldingnitrogen．Consequently，safetyaccidentsoftenappear，andscalelossandcrackofrefracto-ry，largemixed—gasconsumption，equipmentmechanicalpropertiesdegradationaswellashighmaintenancerateoccur．Therefore，ChinaNati

5、onalHeavyMachineryResearchInstituteCo．，Ltdsummarizedanovelandhighly—eficientRHvacuumchamberlancefiringtechniquefromtheaspectsofthegasmixingtechnique，thePIDpa—rametertuning，theMuhi—cascadeandclosed—loopheatingcontroltechnique，thecircularheatingtechniquebythevariabletimelen~handgasflow，andthenitr

6、ogenshieldingtechnique．Afterwa~sthetechniquewasap—pliedfortheheatingvacuumchamberofthe120tRHprojectinChina，andachievedasatisfactoryresult，whichensuredsafeproduction，advancedoperatingrate，reducedthecostpertonofsteel，andimprovedthemarketcompetitivenessofthefinesteels．Keywords：top—lanceheatingofRH

7、vacuumchamber；mixed—gascombustion；PIDflowcontrol；multi-cas—cadeandclosed—loopheatingcontrol；circularheatingofmulti—lanceposition枪、预热枪+氧枪和预热枪+MFB顶枪等三种0前言方式。根据国内某钢厂精炼区物流空间小、热弯常见的RH真空槽烘烤有烘烤盖+多功能顶管不动结合真空槽移动的工艺布置特点、适应厂内原有钢包烘烤习惯以及降低投资和运