SCR脱硝不均匀反应宏观模型研究

doi:10.11930/j.issn.1004-9649.201810005

中国电力 ›› 2019, Vol. 52 ›› Issue (5): 176-184.DOI: 10.11930/j.issn.1004-9649.201810005

• 节能与环保 • 上一篇

SCR脱硝不均匀反应宏观模型研究

宋玉宝, 赵鹏, 姚燕, 谢新华, 韦振祖, 张发捷

西安热工研究院有限公司苏州分公司, 江苏苏州 215153

收稿日期:2018-10-09 修回日期:2019-01-20 出版日期:2019-05-05 发布日期:2019-05-14
作者简介:宋玉宝(1972-),男,博士,研究员,从事电站锅炉氮氧化物控制技术研究,E-mail:sybyuyu@126.com
基金资助:
华能集团总部科技项目（HNKJ16-H04）；苏州市重点产业技术创新项目（SGC201704）。

Study on the Macro Non-uniform Catalytic De-NO_x Reaction Model for SCR System

SONG Yubao, ZHAO Peng, YAO Yan, XIE Xinhua, WEI Zhenzu, ZHANG Fajie

Xi'an Thermal Power Research Institute Co., Ltd. Suzhou Branch, Suzhou 215153, China

Received:2018-10-09 Revised:2019-01-20 Online:2019-05-05 Published:2019-05-14
Supported by:
This work is supported by Technology Project of Huaneng Group Headquarters(No.HNKJ16-H04), Technological Innovation Projects in Key Industries of Suzhou Municipal Government (No.SGC201704).

摘要/Abstract

摘要： 基于催化剂性能表征，对催化剂单体潜能、叠加潜能以及串联潜能之间的内在规律进行研究，提出了SCR脱硝不均匀反应宏观模型，并利用实测数据进行了模型验证。研究结果显示：（1）NH₃/NO摩尔比分布和催化剂局部劣化对脱硝性能的影响显著，超低排放设计对应的烟气参数分布偏差会降低催化剂性能8%~10%；（2）喷氨格栅上游的烟气速度、NO_x浓度以及氨气流量分配决定了催化剂入口的NH₃/NO摩尔比分布，增设大尺度静态混合器和定期调整喷氨分配，能够从设计和运行角度提高脱硝反应均匀性。

关键词: SCR催化剂, 不均匀反应模型, NH₃/NO摩尔比, 参数分布偏差, 烟气混合, 喷氨调整, 超低排放

Abstract: Based on the characteristics of the catalyst performance, the inherent relationship between the element potential, superposed potential and serial potential, was studied and the macro model of non-uniform catalytic De-NO_x reaction was presented and verified by measurement data. The study results indicated significant impacts of NH₃/NO mole ratio and part catalyst deactivation on the SCR performance, which would be reduced by about 8%-10% due to flue gas distribution deviation corresponding to the ultra-low NO_x emission design. In addition, the NH₃/NO mole ratio at catalyst inlet was determined by the distribution of the upstream velocity, NO_x concentration and ammonia flow at the ammonia injection grid cross-section. The large-scale mixer and the periodical tuning for ammonia injection would be helpful to improve the uniformity of De-NO_x reaction and reduce the partial ammonia slip peak value in the aspects of both design and operations.

Key words: SCR catalyst, non-uniform reaction, model, NH₃/NO mole ratio, distribution deviation of parameter, flue gas mixing, ammonia tuning, ultra-low emission

中图分类号:

TM621.9
X701

宋玉宝, 赵鹏, 姚燕, 谢新华, 韦振祖, 张发捷. SCR脱硝不均匀反应宏观模型研究[J]. 中国电力, 2019, 52(5): 176-184.

SONG Yubao, ZHAO Peng, YAO Yan, XIE Xinhua, WEI Zhenzu, ZHANG Fajie. Study on the Macro Non-uniform Catalytic De-NO_x Reaction Model for SCR System[J]. Electric Power, 2019, 52(5): 176-184.

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SCR脱硝不均匀反应宏观模型研究

Study on the Macro Non-uniform Catalytic De-NO_x Reaction Model for SCR System

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SCR脱硝不均匀反应宏观模型研究

Study on the Macro Non-uniform Catalytic De-NOx Reaction Model for SCR System

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Study on the Macro Non-uniform Catalytic De-NO_x Reaction Model for SCR System