钒钛磁铁矿带式焙烧机工艺研究及工程设计

Process research and engineering design of straight-grate for V-Ti magnetite ore

依托攀钢西昌300万t/a钒钛磁铁矿球团带式焙烧机项目,通过钒钛磁铁矿球团带式焙烧机模拟试验研究,找到了钒钛磁铁矿球团的焙烧特点。结合国内外带式焙烧机工艺发展的先进技术,提出一些钒钛磁铁矿带式焙烧机工程设计的新思路、新手段,如先进布料技术、厚料层焙烧技术、抽干段布风板优化技术、CFD流场模拟技术、先进燃烧技术、烟气氧含量降低技术、鼓干段SO_(2)及NO_(x)降低技术、干式结构梁及风冷梁新技术和三维工程设计技术等。生产实践表明,攀钢西昌钒钛磁铁矿球团带式焙烧机生产线月作业率达98.13%,日产量不低于9 100 t,成品球团矿FeO质量分数为0.6%~1.5%,平均抗压强度不低于2 000 N/P,碱度为自然碱度;排放指标为,烟气中烟尘质量浓度2.53 mg/m^(3)、SO_(2)质量浓度3.15 mg/m^(3)、NO_(x)质量浓度42.42 mg/m^(3)、基准氧体积分数17.34%,均满足排放标准。本项目为国内第1条生产钒钛矿球团的带式焙烧机生产线,应用前景广阔。

Based on the project of Pansteel Xichang 3 million t/a V-Ti magnetite pellet for straight-grate,the roasting characteristics of V-Ti magnetite pellets were found through simulation test of V-Ti magnetite pellet for straight-grate.Combined with the advanced technology of straight-grate at home and abroad,some new ideas and new means of engineering design for V-Ti magnetite straight-grate were put forward,such as advanced material distribution technology,thick layer roasting technology,air distribution plate optimization technology,CFD flow field simulation technology,advanced combustion technology,flue gas oxygen content reduction technology,SO_(2) and NO_(x) reduction technology,dry structure beam and air-cooling beam new technology and three-dimensional engineering design technology.Production practice shows that the monthly operating rate is 98.13%,the daily output is not less than 9100 t,the mass fraction of FeO is 0.6%-1.5%,the average compressive strength is not less than 2000 N/P,and the basicity is natural basicity in the production line of Pansteel Xichang V-Ti magnetite pellet for straight-grate.The emission indexes are that the content of smoke dust,SO_(2),NO_(x) and reference oxygen volume fraction in the flue gas is 2.53 mg/m^(3),3.15 mg/m^(3),42.42 mg/m^(3) and 17.34%,respectively,which all meet the emission standards.This project is the first production line of V-Ti magnetite pellet for straight-grate in China,and the application prospect is broad.