工程科学学报2025，Vol.47Issue(11)：2203-2212,10.DOI:10.13374/j.issn2095-9389.2025.02.14.005
COG喷吹量对高炉冶炼过程影响数值模拟
Numerical simulation of the effect of coke oven gas blowing rate on the blast furnace smelting process
摘要
Abstract
Blowing hydrogen-rich gas into the blast furnace has become an important method for reducing emissions,aligning with the national strategy for carbon emissions reduction and carbon neutrality.Research on blowing coke oven gas(COG)into the blast furnace has also received widespread attention;however only little research has been conducted on the effect of the blowing amount on blast furnace smelting.This study adopts the computational fluid dynamics(CFD)method to explore the effect of COG blowing amount on the pulverized coal combustion rate,gas reduction reactions,and coke reactions at the tuyere and cohesive zone of the blast furnace.The results show a decreasing trend in gas temperature at the tuyere due to the injection of coal powder.Afterward,the gas temperature increaseed significantly,reaching its peak as it exits the raceway.This is mainly attributed to the intense combustion of coal powder and gas-phase combustible components.The temperature then gradually decreased as the gas moved away from the raceway.As the COG injection rate increased from 30 to 120 m3·min-1,the contents of H2O,CO,CO2,and H2 showed a certain degree of upward trend.From the perspective of the coal powder combustion rate,the increased COG injection sustained the volatilization reaction of coal powder and enhanced the water-gas reaction.With the increase in COG injection volume,the reducing atmosphere in the furnace was enhanced.Owing to the competitive effect between H2 and CO,the CO reduction pathway decreased,while the H2 reduction pathway increased.The reaction intensity of coke in the furnace body also changes with the increasing COG injection.As the COG injection increased,the H2 content in the furnace belly gas continued to rise,the water-gas reaction was enhanced,and the combustion reaction of coke was reduced.During the increase of the COG injection rate from 30 to 90 m3·min-1,the thickness of the cohesive zone continued to increase,resulting in decreased permeability and an elevation of the high-pressure zone,which forced more gas to flow rapidly toward the center.However,when the injection rate reached 120 m3·min-1,the thickness of the cohesive zone decreased,permeability improved,the high-pressure zone shifted downward,and the gas velocity distribution at the center became relatively uniform.After injecting COG,the temperature inside the furnace decreased,with significant changes observed in the waist and lower regions,and the high-temperature zone shrank.This occurred because the injected COG gas,at normal temperature,introduced low-temperature gas into the furnace,and the gasification of hydrocarbons absorbed heat.This process increased the total amount of combustion products,thereby requiring more heat for heating.However,as the COG injection volume and oxygen enrichment rate increased,the high-temperature area gradually expanded.关键词
高炉/富氢气体/焦炉煤气(COG)/数值模拟/喷吹量Key words
blast furnace/hydrogen-rich gas/coke oven gas(COG)/numerical simulation/injection volume分类
矿业与冶金引用本文复制引用
周圣智,周密,王文鹏,唐文博,王磊,厉英..COG喷吹量对高炉冶炼过程影响数值模拟[J].工程科学学报,2025,47(11):2203-2212,10.基金项目
国家自然科学基金资助项目(52074081,51604065) （52074081,51604065）
国家重点研发计划(2021YFC2901000) （2021YFC2901000）
辽宁省教育厅重点科技攻关项目(JYTZD2023048) （JYTZD2023048）
钒钛资源综合利用国家重点实验室开放基金课题(2023P4FZG06A) （2023P4FZG06A）
