干熄焦系统焦炭烧损率实时测算及其变化规律  

Real-time calculation and variation law of coke burning loss rate in CDQ system

作　　者：徐荣广 崔利芳 刘森林 王文斌 彭军山 XU Rongguang;CUI Lifang;LIU Senlin;WANG Wenbin;PENG Junshan(Beijing Key Laboratory of Green Recyclable Process for Iron&Steel Production Technology,Beijing 100043,China;Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China;Tangshan Shougang Jingtang Xishan Coking Co.,Ltd.,Tangshan 063200,Hebei,China)

机构地区：[1]绿色可循环钢铁流程北京市重点实验室,北京100043 [2]首钢集团有限公司技术研究院,北京100043 [3]唐山首钢京唐西山焦化有限责任公司,河北唐山063200

出　　处：《中国冶金》2024年第10期76-83,共8页China Metallurgy

基　　金：国家重点研发计划专项资助项目(2017YFB0304300)。

摘　　要：干熄焦系统中硫化物和CO主要源自焦炭烧损,而焦炭烧损普遍存在于干熄焦工艺中。通过研究干熄焦系统中焦炭烧损率变化规律,可为相关污染物治理提供理论支撑。基于干熄焦系统气态碳平衡推导焦炭烧损率的实时测算方法,需要先获得干熄焦环境除尘气中CO和CO_(2)的体积分数。为此,研究了干熄焦环境除尘气组分变化规律,其中的CO_(2)、CO以及少量NO均呈周期性变化,在装焦作业时含量快速升高并出现峰值,随后快速降低并趋于平缓。结合上述检测数据,最终得到真实的焦炭烧损率变化规律。正常生产时焦炭烧损率呈周期性变化,而一定时间内未装焦时其呈下降趋势。装焦作业造成焦炭烧损率出现峰值,其对干熄焦系统焦炭烧损率的贡献比例约为10%。对比焦炭烧损率3种实时测算方法可知,由导入空气法得到的焦炭烧损率数值偏高,而碳(放散气)平衡法得到的焦炭烧损率数值偏低。当循环气体中CO浓度控制过低时焦炭烧损率偏高,通过提高循环气体中CO浓度等措施,可将焦炭烧损率降低至设计水平。There is a common phenomenon of coke burning loss in the coke dry quenching(CDQ)process,which is the main source of sulfide and CO in CDQ system.By studying the variation law of coke burning loss rate in CDQ system,it can provide theoretical support for related pollutants control.Based on gaseous carbon balance in CDQ system,a real-time calculation method for coke burning loss rate was obtained.This method required obtaining volume fractions of CO and CO_(2)in CDQ environment dust removal gas.Therefore,composition variation law of CDQ environment dust removal gas was studied,and there were CO_(2)and CO and a very small amount of NO in the gas.The concentrations of those components change periodically,they increase rapidly and reach a peak during the coke loading operation,and then decrease rapidly and tend to flatten out.The actual variation law of coke burning loss rate was obtained by the above testing data.The coke burning loss rate varies periodically during normal production,while it decreases without coke loading for a time.There is a peak in coke burning loss rate caused by coke loading,and its contribution to coke burning loss rate in CDQ system is about 10%.Comparing the three real-time calculation methods of coke burning rate,it can be seen that the value obtained by imported air method is higher,while the value obtained by carbon(released gas)balance method is lower.Coke burning loss rate is too high when concentration of CO in circulating gas is too low,and it can be reduced to the design level by increasing concentration of CO in circulating gas and taking other measures.

关 键 词：干熄焦 焦炭烧损 烧损率 气态碳 变化规律 

分 类 号：TQ520.5[化学工程—煤化学工程]