摘要
烧结工序SO_(2)排放量占钢铁行业总排放量的80%左右,采用活性炭脱硫脱硝工艺处理烧结烟气,获得的富硫气体用来制备焦亚硫酸钠是有效可行的。目前,在制备焦亚硫酸钠工艺过程中,配液槽中的碳酸钠溶解速率低且均匀性差,通过借鉴钢包底吹的方法,协同原有搅拌器联合搅拌,开发了强化搅拌溶解技术。通过数值模拟对比分析了不同条件下的搅拌效果,并探索出基于叶片搅拌时合理的底吹位置。结果表明,底吹气流改变了搅拌池下方叶片搅拌的流体流动轨迹,搅拌池内的液体随着底吹气流的流动方向上升;当机械叶片搅拌与0.5R位置的4孔底吹搅拌协同作用时,液体流速明显增大,可有效减少搅拌池内的死区面积。
SO_(2) emissions in the sintering process account for approximately 80%of the total emissions of the iron and steel industry.It is an effective and feasible approach to prepare sodium pyrosulfite from the sulfur-rich gas after sintering flue gas treatment.Under the existing technology,the dissolution uniformity of sodium carbonate in the liquid distribution tank under the existing technology is poor and the rate is low.In this paper,the method of ladle bottom blowing is adopted for reference,and a stirring is combined with the agitator to develop enhanced stirring and dissolution technology.Through numerical simulation,the mixing effects under different conditions are compared and scrutinized,and the reasonable bottom-blowing position with blades is explored and achieved.The results state that the bottom-blowing airflow will cast much light upon the flow field of the blade under the mixing tank,and the liquid in the mixing tank will rise with the flow direction of the bottom-blowing airflow.In the simulation scheme of this paper,mechanical blade mixing combined with 4-hole bottom-blowing mixing at the 0.5R position has the best mixing effect in the mixing tank.
作者
赵志坚
吕万峰
佘雪峰
刘鹏
王延江
王静松
ZHAO Zhijian;LYU Wanfeng;SHE Xuefeng;LIU Peng;WANG Yanjiang;WANG Jingsong(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Ironmaking Plant,Delong Steel Limited,Xingtai 054009,Hebei,China)
出处
《江西冶金》
2023年第3期173-178,共6页
Jiangxi Metallurgy
基金
钢铁冶金新技术国家重点实验室基金资助项目(41621021)。
关键词
烧结烟气
搅拌
数值模拟
流场
sintering flue gas
stir
numerical simulation
flow field
