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The denitration efficiency is closely related to the uniformity of flue gas and reductant agent within the selective catalytic reduction (SCR) reactor for the coal-fired unit. Based on the established mathematical model for SCR denitration reaction, a user-defined subprogram is used to couple the multi-component flue gas flow with reaction process. The reliability and effectiveness of the CFD model are verified by comparing the measured and simulated data of the SCR performance of 330 MW level coal-fired units at different loads. According to the hydrodynamics of flue gas and reductant agent together with the chemical reaction process in SCR reactor, a new intensification scheme is proposed by optimizing the structure of deflectors in front of the ammonia injection grids. Furthermore, the effects of operational conditions on emission mass concentration of NO and NH3 are investigated. The results indicates that, the maldistribution of the incoming flue gas to the ammonia injection grids leads to the poor mixing behavior of flue gas and reducing reagent. However, the denitration efficiency of the SCR reactor can be improved by about 3.37% through adjusting the upstream guiding plate structure and installing the baffle around the flue duct wall. Taking the SCR denitration device in this work as an example, the appropriate molar ratio of NH3 to NO is 0.94 when the initial NO mass concentration is 650 mg/m3, which could meet with the emission limit for air pollutions of 50 mg/m3 for NOx and 2.5 mg/m3 for NH3, respectively.

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选择性催化还原(SCR)烟气脱硝效率与其内部烟气和还原剂流动的均匀性密切相关。在建立SCR烟气脱硝反应数学模型基础上,采用用户自定义子程序耦合了多组分烟气流动与反应过程;通过比较不同负荷下330 MW等级燃煤机组脱硝性能的实测与模拟数据验证了模型的可靠性和有效性,基于对反应器内烟气和还原剂流动及其反应特性的数值模拟分析,提出了喷氨格栅上游导流板结构优化方案,进而考察了操作条件对NO和NH3排放质量浓度的影响。结果表明:喷氨格栅来流烟气速度分布的非均匀性是导致烟气与还原剂混合效果较差的主要原因,进而通过调整喷氨格栅上游导流板结构并在烟道壁面增设挡板可将脱硝效率提高约3.37%;为满足NOx质量浓度为50 mg/m3及NH3质量浓度为2.5 mg/m3的排放限值需选取适宜喷氨量,以所选取SCR烟气脱硝装置为例,当烟气初始NO质量浓度为650 mg/m3,SCR烟气脱硝系统适宜氨氮摩尔比应约为0.94。

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张媛媛(1985),女,博士研究生,工程师,主要研究方向污染物控制技术,

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张媛媛(1985),女,博士研究生,工程师,主要研究方向污染物控制技术,

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燃煤机组SCR烟气脱硝系统流场均布一体化建模与性能优化
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张媛媛 1, 2 , 曲江源 2 , 张锴 2
热力发电 | 发电技术论坛 2023,52(8): 146-155
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热力发电 | 发电技术论坛 2023, 52(8): 146-155
燃煤机组SCR烟气脱硝系统流场均布一体化建模与性能优化
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张媛媛1, 2 , 曲江源2, 张锴2
作者信息
  • 1.华北电力大学新能源学院,北京 102206
  • 2.华北电力大学热电生产过程污染物监测与控制北京市重点实验室,北京 102206
  • 张媛媛(1985),女,博士研究生,工程师,主要研究方向污染物控制技术,

Integrated modeling and performance optimization of flow field homogenization in SCR denitrification system of coal-fired unit
Yuanyuan ZHANG1, 2 , Jiangyuan QU2, Kai ZHANG2
Affiliations
  • 1.School of New Energy, North China Electric Power University, Beijing 102206, China
  • 2.Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
出版时间: 2023-08-25 doi: 10.19666/j.rlfd.202212216
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选择性催化还原(SCR)烟气脱硝效率与其内部烟气和还原剂流动的均匀性密切相关。在建立SCR烟气脱硝反应数学模型基础上,采用用户自定义子程序耦合了多组分烟气流动与反应过程;通过比较不同负荷下330 MW等级燃煤机组脱硝性能的实测与模拟数据验证了模型的可靠性和有效性,基于对反应器内烟气和还原剂流动及其反应特性的数值模拟分析,提出了喷氨格栅上游导流板结构优化方案,进而考察了操作条件对NO和NH3排放质量浓度的影响。结果表明:喷氨格栅来流烟气速度分布的非均匀性是导致烟气与还原剂混合效果较差的主要原因,进而通过调整喷氨格栅上游导流板结构并在烟道壁面增设挡板可将脱硝效率提高约3.37%;为满足NOx质量浓度为50 mg/m3及NH3质量浓度为2.5 mg/m3的排放限值需选取适宜喷氨量,以所选取SCR烟气脱硝装置为例,当烟气初始NO质量浓度为650 mg/m3,SCR烟气脱硝系统适宜氨氮摩尔比应约为0.94。

燃煤机组  /  烟气脱硝  /  SCR  /  流场优化  /  数值模拟

The denitration efficiency is closely related to the uniformity of flue gas and reductant agent within the selective catalytic reduction (SCR) reactor for the coal-fired unit. Based on the established mathematical model for SCR denitration reaction, a user-defined subprogram is used to couple the multi-component flue gas flow with reaction process. The reliability and effectiveness of the CFD model are verified by comparing the measured and simulated data of the SCR performance of 330 MW level coal-fired units at different loads. According to the hydrodynamics of flue gas and reductant agent together with the chemical reaction process in SCR reactor, a new intensification scheme is proposed by optimizing the structure of deflectors in front of the ammonia injection grids. Furthermore, the effects of operational conditions on emission mass concentration of NO and NH3 are investigated. The results indicates that, the maldistribution of the incoming flue gas to the ammonia injection grids leads to the poor mixing behavior of flue gas and reducing reagent. However, the denitration efficiency of the SCR reactor can be improved by about 3.37% through adjusting the upstream guiding plate structure and installing the baffle around the flue duct wall. Taking the SCR denitration device in this work as an example, the appropriate molar ratio of NH3 to NO is 0.94 when the initial NO mass concentration is 650 mg/m3, which could meet with the emission limit for air pollutions of 50 mg/m3 for NOx and 2.5 mg/m3 for NH3, respectively.

coal-fired unit  /  flue gas denitration  /  SCR  /  flow field optimization  /  numerical simulation
张媛媛, 曲江源, 张锴. 燃煤机组SCR烟气脱硝系统流场均布一体化建模与性能优化. 热力发电, 2023 , 52 (8) : 146 -155 . DOI: 10.19666/j.rlfd.202212216
Yuanyuan ZHANG, Jiangyuan QU, Kai ZHANG. Integrated modeling and performance optimization of flow field homogenization in SCR denitrification system of coal-fired unit[J]. Thermal Power Generation, 2023 , 52 (8) : 146 -155 . DOI: 10.19666/j.rlfd.202212216
  • 国家重点研发计划项目(2020YFB0606203)
2023年第52卷第8期
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doi: 10.19666/j.rlfd.202212216
  • 首发时间:2026-01-26
  • 出版时间:2023-08-25
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  • 修回日期:2022-12-12
基金
National Key Research and Development Program(2020YFB0606203)
国家重点研发计划项目(2020YFB0606203)
作者信息
    1.华北电力大学新能源学院,北京 102206
    2.华北电力大学热电生产过程污染物监测与控制北京市重点实验室,北京 102206
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2种不同金属材料的力学参数

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占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
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species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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