钢铁生产主工序碳排放数字化仿真及流程改造

Carbon Emission Digital Simulation and Process Transformation of Main Process in Steel Production

对照我国提出的“双碳”战略,钢铁行业降碳减排时间紧,任务重,刻不容缓。作为降碳减排的重要手段,钢铁生产碳排放数字化仿真目前主要集中于炼铁、炼钢等单一工序,存在着多工序碳排放模型缺乏、系统性流程改造方案欠缺等问题。为此,开展了钢铁生产主工序流程碳排放数字化仿真及流程改造研究。首先,构建了“5+1”主工序流程碳排放数学模型,开发了华铸钢铁生产碳排放仿真软件,解决钢铁行业主工序流程模型缺乏问题;其次,基于宝钢和唐钢等企业数据进行验证,吻合度超96%,证实了模型与软件的准确性和可靠性,为流程改造奠定基础;最后,从技术革新、碳回收、碳中和和能源变更等四个方面,系统性提出了NTC(New Technology Combination)、燃烧后CO_(2)回收、燃烧前CO_(2)回收、氢冶金短流程生产等四种方案,技术实现从易到难,可依次服务于近期、中期、中后期和后期“双碳”计划,对钢铁行业降碳减排具有很好的参考作用。

According to China′s proposed“double carbon”strategy,the iron and steel industry to reduce carbon emissions in a tight schedule,the task is heavy,there is no time to lose.As an important means of reducing carbon emissions,digital simulation on carbon emissions from steel production is currently mainly focused on a single process such as ironmaking and steelmaking,and there are problems such as the lack of multi-process carbon emission model and the lack of systematic process optimization schemes.Therefore,digital simulation and process transformation of carbon emission in the whole process of steel production were carried out.Firstly,this paper constructed the“5+1”full-process carbon emission mathematical model and developed the InteCast Steel Production Carbon Emissions Simulation Software to solve the lack of main process flow models;Secondly,based on the data of Baosteel and Tangsteel,the match was over 96%,which confirmed the accuracy and reliability of the model and software,and laid the foundation for process transformation;Finally,it covered the four aspects of technological innovation,carbon recovery,carbon neutralization and energy change.The NTC(New Technology Combination)plan,post-combustion CO_(2) recovery plan,pre-combustion CO_(2) recovery plan and hydrogen metallurgical short-process production plan were systematically proposed.The four schemes,from easy to difficult,can serve the“double carbon”plan in the near term,middle term,middle and late period,and have a good reference for the steel industry to reduce carbon emission.