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In the denitrification process, flue gas needs to be heated due to the temperature requirements of denitration reaction are high, more blast furnace gas is consumed so that a large amount of CO₂ is generated. In order to achieve the energy conservation and carbon reduction, energy saving type built-in direct fired furnace is used instead of traditional heating furnace. The flue gas is heated with the heat released by igniting the CO in flue gas with energy saving type built-in direct fired furnace so that the consumption of blast furnace gas and carbon emission are reduced as well as temperature requirements of denitrification could be met. The consumption of blast furnace gas is reduced by 17.9% with energy saving type built-in direct fired furnace, annual CO₂ emission reduction of over 35 000 t is achieved and annual cost saving could reach over RMB 4 million yuan through applications and comparisons, which could meet the requirements of energy conservation and carbon reduction for steel enterprises on the premise of meeting requirements of denitrification reactions.

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在脱硝过程中,由于脱硝反应温度要求较高,需要对烟气进行加热,此过程消耗较多的高炉煤气,产生大量的CO₂。为实现节能降碳,使用节能型内置式直燃炉代替传统加热炉,节能型内置式直燃炉通过引燃烟气中的CO释放热量加热烟气,减少高炉煤气消耗,降低碳排放,同时满足脱硝温度需求。经过使用对比,节能型内置式直燃炉可减少17.9%的高炉煤气用量,实现年减排CO₂ 35 000 t以上,年节约费用达400万元以上,在满足脱硝反应的前提下,亦可满足钢铁企业节能降碳的需求。

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张鹏程(1985-),男,山西省忻州市人,硕士,高级工程师,现从事环境保护技术工作。

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张鹏程(1985-),男,山西省忻州市人,硕士,高级工程师,现从事环境保护技术工作。

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项目	节能型内置式直燃炉	传统加热炉
投资收益	可通过节约燃料实现收益,短期内收回投资成本,后期没有维护修理费用	无节能收益,且后期有维护修理费用
经济性	比传统加热炉节约15%以上高炉煤气	高能耗,高炉煤气浪费
安全性	燃烧空间大,CO浓度在安全范围,发生爆燃事故风险极低	在狭小密闭空间内燃烧,CO浓度易达到爆炸极限
可靠性	故障率低、设备故障点少,可长期连续运行,可利用烧结机停机检修时间进行维护	风道和炉膛耐材容易脱落,严重时需停机检修,烧结机被迫停机,产生较大经济损失
点火方式	采用电子或等离子点火器,可远程操作,方便、安全、快捷	采用焦炉煤气、乙炔、液化气等点火,温度达到一定程度可使用高炉煤气,现场存放存在安全隐患
升温速度	在大烟道内燃烧,高炉煤气量受空间限制程度低,升温速度快,迅速达到SCR反应温度	高炉煤气量受限于炉膛空间,为防止炉膛超温和爆燃,升温速度较慢
CO减排	可通过引燃消耗CO	无法处理CO
CO2减排	降低高炉煤气消耗,降低CO2排放量	无法降低CO2排放量
占用空间	占用空间小,可在烟道内部安装	需额外占用外部空间
安装施工	安装流程简便,周期短	安装流程复杂,施工量大

), ArticleFig(id=1188423786949918999, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188423626652009379, language=CN, label=表1, caption=

节能型内置式直燃炉与传统加热炉对比

, figureFileSmall=null, figureFileBig=null, tableContent=

项目	节能型内置式直燃炉	传统加热炉
投资收益	可通过节约燃料实现收益,短期内收回投资成本,后期没有维护修理费用	无节能收益,且后期有维护修理费用
经济性	比传统加热炉节约15%以上高炉煤气	高能耗,高炉煤气浪费
安全性	燃烧空间大,CO浓度在安全范围,发生爆燃事故风险极低	在狭小密闭空间内燃烧,CO浓度易达到爆炸极限
可靠性	故障率低、设备故障点少,可长期连续运行,可利用烧结机停机检修时间进行维护	风道和炉膛耐材容易脱落,严重时需停机检修,烧结机被迫停机,产生较大经济损失
点火方式	采用电子或等离子点火器,可远程操作,方便、安全、快捷	采用焦炉煤气、乙炔、液化气等点火,温度达到一定程度可使用高炉煤气,现场存放存在安全隐患
升温速度	在大烟道内燃烧,高炉煤气量受空间限制程度低,升温速度快,迅速达到SCR反应温度	高炉煤气量受限于炉膛空间,为防止炉膛超温和爆燃,升温速度较慢
CO减排	可通过引燃消耗CO	无法处理CO
CO2减排	降低高炉煤气消耗,降低CO2排放量	无法降低CO2排放量
占用空间	占用空间小,可在烟道内部安装	需额外占用外部空间
安装施工	安装流程简便,周期短	安装流程复杂,施工量大

), ArticleFig(id=1188423787017027864, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188423626652009379, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=

项目	温度/℃	CO浓度/%
加热前	266	0.955 7
加热后	303	0.862 9
前后差值	37	-0.092 8

), ArticleFig(id=1188423787071553817, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188423626652009379, language=CN, label=表2, caption=

节能型内置式直燃炉加热前后CO浓度变化

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项目	温度/℃	CO浓度/%
加热前	266	0.955 7
加热后	303	0.862 9
前后差值	37	-0.092 8

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