冷轧热镀锌退火炉节能高效生产分析  

Energy Saving and High Production Efficiency of Cold Rolled Hot-dip Galvanizing Annealing Furnace

作　　者：方瑞[1] 李坚[1] 吴亭亭[1] 

机构地区：[1]华东理工大学煤气化及能源化工教育部重点实验室,上海200237

出　　处：《表面技术》2016年第6期42-48,共7页Surface Technology

摘　　要：目的采用热工测试与结构检查手段分析冷轧热镀锌退火炉加热段热工操作及结构存在的问题,并给出合理的解决方案。方法将退火炉预热段(PHS)与直接燃烧加热段(DFS)作为一个系统,辐射管加热均热段(RHS)作为另一个系统,分别采取合适的热工测试方案及结构检查的细节,主要涉及到温度、压力、流量及烟气成分等的实时测量。结果炉子DFS与RHS段烧嘴的工艺参数控制与选择不恰当。前者因过度控制炉内气氛调节而空气系数过低,导致燃料利用率低;后者因不精确的进气方式吸入过剩空气,使烟气温度偏低、生成量大,致使热量利用率低。同时,还存在烟气余热利用及炉墙保温材料使用寿命等问题。结论适度提高DFS段空气系数,改RHS段助燃空气为"抽-鼓"方式进气,改善烟气余热回收设备与方式,定期关注炉墙表面温度波动,将有利于退火炉的节能降耗,提高其热效率。整改结果显示,PHS/DFS段热效率由51.8%提高至60.0%,RHS段热效率由44.3%提高至55.8%。Objective To analyze the heating period of thermal operation and the problems existing in the structure of cold rolled continuous hot-dip galvanizing annealing furnace（CAF） and give reasonable solutions by means of thermal test and structural examination. Methods Regarding preheating section（PHS） and direct-fired heating section（DFS） as a system, and radiation heating section as another, appropriate test scheme and examination details were adopted, involving the real-time measurements of temperature, pressure, flow rate and gas composition. Results The control and choice of DFS and RHS burner process parameters were not appropriate. The former had a low utilization rate of fuel because of excessive control atmosphere in furnace by lower air coefficient too much, the latter had a low heat utilization rate due to the inaccurate inlet mode leading to inhalation of excess air. Meanwhile, there were other problems such as under-explored gas waste heat recovery and service life of thermal insulation material. Conclusion Moderately increasing DFS air coefficient, changing RHS air inlet mode to ＂pumping-blowing＂, improving the gas waste heat recovery equipment and methods, regularly monitoring temperature fluctuations on the furnace wall surface will be helpful for saving energy, reducing consumption of fuel and improving the thermal efficiency of annealing furnace. Rectification results showed that the thermal efficiency of PHS/DFS section was increased from 51.8% to 60%, and that of RHS section was increased from 44.3% to 55.8%.

关 键 词：退火炉 设备改善 工艺参数 节能 热效率 

分 类 号：TQ153.1[化学工程—电化学工业] TG155[金属学及工艺—热处理]