A partitioned dynamic ammonia injection strategy based on real-time NOx flux distribution characteristics in an SCR system

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2024-11-13 DOI:10.1016/j.fuel.2024.133711

Chao Zhang , Guofu Liu , Xin Zhang , Angang Song , Dan Xu , Xiaowu Jiang , Chenghong Gong , Xiaobo Zhou , Qiuping Gong , Dekui Shen

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引用次数: 0

Abstract

To optimize the NO_x/NH₃ (Nitrogen Oxides/Ammonia) matching ratio for a SCR (Selective Catalytic Reduction) system, dynamic NH₃ injection was achieved on the basis of the constructed control rules for critical AIG (Ammonia Injection Grid) branch-pipe valves via the determination of the basic NH₃ injection amount and the secondarily distributed NH₃ injection amount. Moreover, the real-time NO_x flux distribution characteristics in each subzone were analysed on the basis of the operation data of the flue gas velocity and NO_x concentration originating from multiple measuring points located in the flue cross-section which is in front of the AIG. The engineering application results of a 350 MW coal-fired unit revealed that 12 “critical” AIG branch-pipe valves achieved dynamic NH₃ injection. With a maximum fluctuation in NO_x flux of 433 mol/h in the subzone of the individual flue cross-section, the opening of this AIG branch-pipe valve was subsequently adjusted by 22° to optimize the NO_x/NH₃ matching ratio in the system in a timely manner. The ACRs (Ammonia Consumption Rates) of the A and B sides in the studied SCR system were reduced by approximately 26.70 % and 11.90 %, respectively. In addition, the average RSD (Relative Standard Deviation) of the NO_x concentration at the outlet of the SCR reactor for sides A and B were approximately 11.9 % and 13.6 %, which were reduced by approximately 11.63 % and 15.47 %, respectively, owing to the application of the dynamic NH₃ injection strategy.

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基于选择性催化还原系统实时氮氧化物通量分布特征的分区动态喷氨策略

为了优化 SCR（选择性催化还原）系统的氮氧化物/NH3（氮氧化物/氨）匹配比，根据所构建的关键 AIG（氨注入网格）支管阀控制规则，通过确定基本 NH3 注入量和二次分配 NH3 注入量，实现了动态 NH3 注入。此外，根据位于 AIG 前方烟道横截面上多个测量点的烟气速度和氮氧化物浓度的运行数据，分析了每个分区的实时氮氧化物流量分布特征。350 兆瓦燃煤机组的工程应用结果显示，12 个 "关键 "AIG 支管阀门实现了动态 NH3 喷射。在单个烟道横截面的分区中，氮氧化物流量的最大波动为 433 mol/h，该 AIG 支管阀门的开度随后调整了 22°，及时优化了系统中的氮氧化物/NH3 匹配比。所研究的 SCR 系统 A 侧和 B 侧的 ACR（氨消耗率）分别降低了约 26.70 % 和 11.90 %。此外，由于采用了动态 NH3 喷射策略，A 侧和 B 侧 SCR 反应器出口处氮氧化物浓度的平均 RSD（相对标准偏差）分别约为 11.9 % 和 13.6 %，分别降低了约 11.63 % 和 15.47 %。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.