流体机械

2020, v.48;No.573(03) 46-51

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混合器对SCR脱硝系统内多相多组分流动特性影响的数值研究
Numerical Study on Gas-Solid Phase Flow and Species Concentration Performance of Static Mixers with an SCR-DeNO_x System

雷鉴琦;王晓波;吕秀川;闫俊刚;严冰清;
Lei Jianqi;Wang Xiaobo;Lv Xiuchuan;Yan Jungang;Yan Bingqing;Datang Northeast Electric Power Test and Research Institute Co.,Ltd.;China Northeast Municipal Engineering Design and Research Institute Co.,Ltd.;Datang Hebei Power Generation Co.,Ltd.,Matou Thermal Power Branch;

摘要(Abstract):

为了从流动特性、烟尘运动、氨氮混合等方面综合分析对比SCR脱硝系统内圆盘、管式、V型、三角翼混合器的性能,利用数值模拟方法对SCR脱硝系统内两相流动、组分输运及流阻特性进行了数值计算。计算结果表明:与未安装混合器方案相比,脱硝入口至催化剂上方截面流动阻力增加了9.566%~24.051%,在促进氨氮混合方面,圆盘混合器性能最优,氨氮比均匀性相对提高44.487 9%。热态气固两相流动模拟结果显示,各类型混合器均能提高催化剂入口截面烟尘浓度的均匀性,但在相同迎风面积条件下,圆盘混合器会引起的流动阻力最大。定义了烟尘浓度C_v、氨氮比C_v与压降Δp归一化处理后的差值为混合器性能的衡量标准,圆盘混合器的综合性能最优。
In order to comprehensively analyze the performance of disk,pipe,V-shape and delta wing mixers in terms of flow characteristics,motion of flue gas,mixing of NH_3/NO_x gas,etc.in the SCR de-nitration system,numerical simulation was carried out on the gas-solid phase flow,species transport,flow resistance characteristics of the mixers using the numerical simulation method.The results show that,compared with the original scheme without the mixed installed,the flow resistance on the section of the part from de-nitration inlet to top of the catalyst was increased by 9.566%~24.051%,the disc mixer had the best performance in terms of ammonia and nitrogen mixing,and homogeneity of NH_3/NO_x ratio was relatively improved by 44.487 9%.Numerical simulation results of two-phase flow in hot state show that all types of mixers can improve homogeneity of the particle mass concentration at catalyst inlet,but disk mixers cause the greatest flow resistance under the condition of equal windward area.The difference in ash concentration,ammonia-nitrogen ratio and pressure drop Δp after normalization was defined as the criterion to measure the performance of the mixers,and the disk static mixers has the comprehensive optimal performance.

关键词(KeyWords): 混合器;SCR脱硝;数值模拟;两相流动
static mixer;SCR De-nitration;numerical simulation;two-phase flow

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基金项目(Foundation): 吉林省科技发展计划资助项目(20180201001SF);; 中国大唐集团公司重大科技项目(13.12)

作者(Author): 雷鉴琦;王晓波;吕秀川;闫俊刚;严冰清;
Lei Jianqi;Wang Xiaobo;Lv Xiuchuan;Yan Jungang;Yan Bingqing;Datang Northeast Electric Power Test and Research Institute Co.,Ltd.;China Northeast Municipal Engineering Design and Research Institute Co.,Ltd.;Datang Hebei Power Generation Co.,Ltd.,Matou Thermal Power Branch;

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