混酸废液焙烧再生炉内流场和温度场分布的可控模拟  

CONTROL SIMULATION OF FLOW FIELD AND TEMPERATURE FIELD DISTRIBUTION IN ROASTER OF THE MIXED ACID REGENERATION PROCESS

作　　者：项明武[1] 高俊峰[1] 赵金标[1] 丁煜[1] 蔡全福[1] 王军[1] 吴宗应[1] 田新 XIANG Ming-wu;GAO Jun-feng;ZHAO Jin-biao;DING Yu;CAI Quan-fu;WANG Jun;WU Zong-ying;TIAN Xin(WISDRI Engineering&Research Co.,Ltd,Wuhan 430223,China)

机构地区：[1]中冶南方工程技术有限公司,武汉430223

出　　处：《环境工程》2020年第12期86-91,共6页Environmental Engineering

基　　金：武汉东湖国家自主创新示范区“3551光谷人才计划”基金项目(2014122G147);中国冶金科工集团重点研发项目(2016011102)。

摘　　要：喷雾焙烧法作为不锈钢混酸废液全酸回收的最先进工艺方法,不仅可以实现废液中游离酸和化合酸的回收,还可以实现金属氧化物的回收。若该工艺中焙烧炉(核心设备)内流场和温度场分布混乱,易加剧金属氧化物粉末挂壁,进而导致废酸不能完全反应而腐蚀炉体,影响生产运行。采用模拟软件Fluent对不同空燃比、燃烧气初始流速等条件下焙烧炉内流场和温度场的分布进行模拟,以获得最优的流场和温度场,最大程度消除金属氧化物粉末的挂壁现象,确保设备的长时间稳定运行。结果表明:在燃气介质为煤气,燃烧气初始流速为20 m/s,空燃比为1.7∶1模拟时可获得最佳的流场和温度场分布,在该最佳条件下焙烧炉内温度梯度的实际测量与模拟结果基本吻合,也进一步验证了模型建立的正确性。在改变燃气介质为天然气的条件下,在燃烧气初始流速为20 m/s,空燃比为13∶1时也可模拟获得最佳的流场和温度场分布。该模型对今后酸再生工艺的开发设计和运行管理具有良好的指导作用。As the most advanced technological method for recovering total acid from stainless steel mixed acid waste,spraying and roasting can not only recover free acid and compound acid,but also recover metal oxide.In this process,the flow field and temperature field distribution chaos in the roaster will intensify metal oxide powder wall-hanging,and eventually lead to that the waste acid can not be fully reacted and corrode the roastor.In this study,simulation software Fluent was used to simulate the distribution of the flow field and temperature field in the roastor under different conditions such as air-fuel ratio and initial velocity of the post combustion gas,so as to obtain the optimal flow field and temperature field,eliminate the wall-hanging phenomenon of metal oxide powder to the maximum extent,and ensure the stable operation of the equipment for a long time.The results showed that the optimal flow field and temperature field distribution could be simulated when the gas medium was coal gas,the initial flow velocity of the post combustion gas was 20 m/s,and the air-fuel ratio was 1.7∶1.The actual measurement of the temperature gradient in the roaster under this optimal condition was basically consistent with the simulation results,which further verified the correctness of the model establishment.Under the condition of changing the gas medium to natural gas,the optimal flow field and temperature field distribution could also be simulated when the initial velocity of the post combustion gas was 20 m/s and the air-fuel ratio was 13∶1.The model could be used to guide the development,design and operation management of acid regeneration process in the future.

关 键 词：喷雾焙烧法 焙烧炉 挂壁 腐蚀 流场 

分 类 号：X703[环境科学与工程—环境工程]