燃煤电厂SCR脱硝系统喷氨优化模拟
X799.3; 为提高某660 MW机组SCR(选择性催化还原)脱硝反应器出口NOx质量浓度分布均匀性,文中以SCR出口NOx质量浓度分布相对标准偏差最小为优化目标,提出了一种基于动力学模型的最优喷氨策略.将现场实测数据作为入口边界条件,耦合反应器内的湍流流动、组分输运和化学反应,进行了CFD数值模拟计算.对氨流动特性进行可视化分析,并定义喷氨格栅分区/喷嘴的流动影响系数,结合基于SCR反应动力学模型建立的出口NOx浓度分布与入口NH3浓度的数学关系,直接求解优化矩阵方程,可得到喷氨格栅不同分区或不同喷嘴的最优可控喷氨流量.模拟结果表明:均匀喷氨方式下,不同分区氨氮浓度混合匹配度不高,SCR反...
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| Published in | 华南理工大学学报（自然科学版） Vol. 51; no. 8; pp. 62 - 70 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
华南理工大学 电力学院,广东 广州 510640%广东红海湾发电有限公司,广东 汕尾 516623
01.08.2023
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1000-565X |
| DOI | 10.12141/j.issn.1000-565X.220446 |
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| Abstract | X799.3; 为提高某660 MW机组SCR(选择性催化还原)脱硝反应器出口NOx质量浓度分布均匀性,文中以SCR出口NOx质量浓度分布相对标准偏差最小为优化目标,提出了一种基于动力学模型的最优喷氨策略.将现场实测数据作为入口边界条件,耦合反应器内的湍流流动、组分输运和化学反应,进行了CFD数值模拟计算.对氨流动特性进行可视化分析,并定义喷氨格栅分区/喷嘴的流动影响系数,结合基于SCR反应动力学模型建立的出口NOx浓度分布与入口NH3浓度的数学关系,直接求解优化矩阵方程,可得到喷氨格栅不同分区或不同喷嘴的最优可控喷氨流量.模拟结果表明:均匀喷氨方式下,不同分区氨氮浓度混合匹配度不高,SCR反应器出口NOx质量浓度相对标准偏差达到40.1%,分布均匀性较差;按文中提出的方法进行喷氨优化后,出口NOx质量浓度相对标准偏差下降至6.8%,出口均匀性大幅提高,既能实现NOx压线排放满足环保要求,又可避免出现脱硝效率过高和过低的区域.文中通过数值模拟的方式将流场可视化,通过定量求解各阀门喷氨量进行喷氨优化,可以为实际电厂喷氨优化调试提供理论参考,降低调整的盲目性. |
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| AbstractList | X799.3; 为提高某660 MW机组SCR(选择性催化还原)脱硝反应器出口NOx质量浓度分布均匀性,文中以SCR出口NOx质量浓度分布相对标准偏差最小为优化目标,提出了一种基于动力学模型的最优喷氨策略.将现场实测数据作为入口边界条件,耦合反应器内的湍流流动、组分输运和化学反应,进行了CFD数值模拟计算.对氨流动特性进行可视化分析,并定义喷氨格栅分区/喷嘴的流动影响系数,结合基于SCR反应动力学模型建立的出口NOx浓度分布与入口NH3浓度的数学关系,直接求解优化矩阵方程,可得到喷氨格栅不同分区或不同喷嘴的最优可控喷氨流量.模拟结果表明:均匀喷氨方式下,不同分区氨氮浓度混合匹配度不高,SCR反应器出口NOx质量浓度相对标准偏差达到40.1%,分布均匀性较差;按文中提出的方法进行喷氨优化后,出口NOx质量浓度相对标准偏差下降至6.8%,出口均匀性大幅提高,既能实现NOx压线排放满足环保要求,又可避免出现脱硝效率过高和过低的区域.文中通过数值模拟的方式将流场可视化,通过定量求解各阀门喷氨量进行喷氨优化,可以为实际电厂喷氨优化调试提供理论参考,降低调整的盲目性. |
| Author | 李博航 姚顺春 卢志民 陈咏城 唐雯 吴康洛 |
| AuthorAffiliation | 华南理工大学 电力学院,广东 广州 510640%广东红海湾发电有限公司,广东 汕尾 516623 |
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| Author_FL | LI Bohang TANG Wen LU Zhimin CHEN Yongcheng YAO Shunchun WU Kangluo |
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| DocumentTitle_FL | Optimization Simulation of Ammonia Injection in SCR DeNOx System of Coal-Fired Power Plant |
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| Keywords | SCR脱硝反应 ammonia spraying optimization NOx concentration field kinetic model 喷氨优化 动力学模型 数值模拟 SCR DeNOx reaction numerical simulation NOx浓度场 |
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| Publisher | 华南理工大学 电力学院,广东 广州 510640%广东红海湾发电有限公司,广东 汕尾 516623 |
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| Title | 燃煤电厂SCR脱硝系统喷氨优化模拟 |
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