SCR系统结构模型与数值模型的适用性分析

doi:10.11930/j.issn.1004-9649.201803006

中国电力 ›› 2019, Vol. 52 ›› Issue (3): 146-152,160.DOI: 10.11930/j.issn.1004-9649.201803006

SCR系统结构模型与数值模型的适用性分析

肖育军¹, 邹毅辉¹, 李彩亭², 周雪斌¹

1. 中国能源建设集团华中电力试验研究院有限公司, 湖南长沙 410005;
2. 湖南大学环境科学与工程学院, 湖南长沙 410082

收稿日期:2018-03-02 修回日期:2019-01-02 出版日期:2019-03-05 发布日期:2019-03-27
作者简介:肖育军(1987-),男,硕士,工程师,从事大气污染预防与治理研究,E-mail:xiaoyujun712@163.com;邹毅辉(1974-),男,硕士,高级工程师,从事火电发电机组节能技术研究,E-mail:761562455@qq.com;李彩亭(1964-),男,教授,博士生导师,从事大气污染预防与治理研究,E-mail:ctli@hnu.edu.cn;周雪斌(1978-),男,硕士,高级工程师,从事火电发电机组节能技术研究,E-mail:zxb198@126.com
基金资助:
国家重点研发计划资助项目（2016YFC0204104）。

Applicability Analysis on the Structure Model and Numerical Model for the SCR System

XIAO Yujun¹, ZOU Yihui¹, LI Caiting², ZHOU Xuebin¹

1. China Energy Engineering Group Central China Electric Power Test and Research Institute Co., Ltd., Changsha 410005, China;
2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China

Received:2018-03-02 Revised:2019-01-02 Online:2019-03-05 Published:2019-03-27

摘要/Abstract

摘要： 针对火电厂SCR系统数值计算中结构模型与数值模型准确性与适应性等问题，建立完整与不完整的SCR系统结构模型，运用标准κ-ε模型与Realizable κ-ε模型对其进行数值计算。通过与实测速度值对比，分析湍流模型与省煤器出口、灰斗、喷氨格栅、均流格栅结构对流场计算准确性的影响；通过与实测压降、出口NO_x浓度分布、出口NH₃逃逸分布的对比，分析与论证多孔介质模型、多组分反应模型中参数设定的理论性与准确性。结果表明：标准κ-ε模型与Realizable κ-ε模型都能准确计算SCR系统内烟气流场与压降特性；省煤器出口与喷氨格栅结构对进口烟道内流场的准确计算影响显著；单层催化剂压降模拟值与实验值之间的相对误差为-1.9%；NO_x脱除效率模拟值79.35%与实测值80.56%间的相对误差为-1.5%，且两者NH₃逃逸分布趋势一致。

关键词: 火电厂, 烟气脱硝, 数值模拟, 结构模型, 多孔介质, 化学反应, 脱硝效率, 氨逃逸

Abstract: The accuracy and adaptability of the structure model and numerical model were discussed scantly in the numerical calculation for the thermal power plant SCR system. Therefore, in this paper both the complete and the partial structural models were established based on the structural characteristics of the typical SCR system, then simulated using the Fluent software with standard κ-ε turbulence model and Realizable κ-ε turbulence model. Through the comparison of velocities between the simulation and experiment results, the impacts of the turbulence model and the economizer export, the ash hopper, the AIG and the uniform flow grille pattern on the calculation accuracy of flue gas flow field were analyzed. Similarly, by comparing the simulation and experiment results regarding the pressure drops, the NO_x concentration distribution and NH₃ escape distribution in the outlet flue, the method correctness and validity of parameter setting in the porous medium model as well as the multi-component reaction model were also demonstrated respectively The results showed that the economizer export structure and the AIG structure had significant impacts on the calculation accuracy of the flue gas flow field in the inlet flue. The relative error between the simulated and experimental pressure drop across single layer of catalyst was -1.9%. The NO_x removal efficiency of simulation and experiment were 79.35% and 80.56%, respectively with the relative error -1.5%. The NH₃ escape distribution trends of the simulation and experiment result were consistent as well.

Key words: thermal power plant, flue gas de-NO_x, numerical simulation, structure model, porous media, chemical reaction, denitrification efficiency, ammonia escape

中图分类号:

X701
TM621

肖育军, 邹毅辉, 李彩亭, 周雪斌. SCR系统结构模型与数值模型的适用性分析[J]. 中国电力, 2019, 52(3): 146-152,160.

XIAO Yujun, ZOU Yihui, LI Caiting, ZHOU Xuebin. Applicability Analysis on the Structure Model and Numerical Model for the SCR System[J]. Electric Power, 2019, 52(3): 146-152,160.

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https://www.electricpower.com.cn/CN/Y2019/V52/I3/146

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SCR系统结构模型与数值模型的适用性分析

Applicability Analysis on the Structure Model and Numerical Model for the SCR System

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SCR系统结构模型与数值模型的适用性分析

Applicability Analysis on the Structure Model and Numerical Model for the SCR System

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