制硫酸工艺在球团烟气净化中的应用

Application of Sulphuric Acid Process in the Pellet Flue Gas Purification

首钢球团200万t/a生产线采用CSCR活性炭脱硫脱硝技术对烟气进行净化,此工程配套建设一套硫酸制备系统,该系统采用了3+1四段转化、二转二吸的制酸工艺,在两年多的生产实践中,结合球团生产的实际情况,对其进行了适应性改造。通过适当降低活性炭循环量、降低原烟气中氮氧化物含量、SNCR+CSCR匹配喷氨等措施共同作用降低氮氧化物,稳定干吸酸浓控制,使成品酸透明度和色度逐渐达标合格。通过分析影响两转两吸自热平衡的因素,确定科学控制参数,实现降低能耗、稳定生产。制酸工艺在首钢球团二系列生产线上的成功应用,为此技术在氧化球团生产线的推广应用起到了带头示范作用。

2 million t/a of pellet production line of Shougang Co.,Ltd.adopts CSCR activated carbon desulfurization and denitration technology for purification of flue gas,this project shall be constructed in complete set with one set of sulphuric acid preparation system,which will adopt acid production process of 3+1 four-segment transformation,two transformation and two absorption,and in the course of two years of practical production,in combination with practical situation of pellet production,adaptive reconstruction has been made.By adopting measures of suitably reduction of activated carbon circulation volume,reduction of nitrogen oxide content in the original flue gas,SNCR+CSC matching spraying of ammonia,nitrogen oxide shall be reduced,so as to stable dry absorption acid thickness control data,and to be sure the finished product acid transparency and color degree reaching the requirement and to be qualified gradually.Through analysis the factors of two transformation and two absorption self heating balance,data for scientifically control shall be defined,so as to realize reduction of energy consumption and production stability.Successful application of sulphuric acid process in the two series of production line of Shougang Pellet Plant shall play a leading and demonstration role in the popularization and application of oxidation pellet production line.