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An Experimental Study on the Characteristics of NO x Distributions at the SNCR Inlets of a Large-Scale CFB Boiler

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  • Jin Yan

    (College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
    Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, Chongqing 400044, China)

  • Xiaofeng Lu

    (Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, Chongqing 400044, China)

  • Changfei Zhang

    (College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China)

  • Qianjun Li

    (College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China)

  • Jinping Wang

    (Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China)

  • Shirong Liu

    (Datang Wu’an Power Plant Co. Ltd., Handan 056300, China)

  • Xiong Zheng

    (Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, Chongqing 400044, China)

  • Xuchen Fan

    (Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education of PRC, Chongqing University, Chongqing 400044, China)

Abstract

The unknown NO x distributions inside large-scale CFB (circulating fluidized bed) boilers have always hindered the economy of the SNCR (selective non-catalytic reduction) process. In this study, field tests were carried out on a typical 300 MW CFB boiler, where multi-level 316 L-made probe and Ecom-J2KN/Testo 350 analyzers were used to perform detailed two-dimensional distributions of flue gas composition at SNCR inlets for the first time. The penetration depth inside the horizontal flue pass was up to 7 m. The NO x distributions were analyzed in detail combining with the auxiliary test in the dilute phase zone. Key results show that the average O 2 concentrations in #A and #C regions were 6.52% and 0.95%, respectively. The vertical NO x distributions of #A and #C SNCR inlets were similar, showing a trend of first increasing and then decreasing with peak value all appeared at 5 m depth, while the NO x distribution of #B SNCR inlet was basically increasing. Some local areas with extremely high NO x concentration (over 2000 mg/m 3 ) were observed near the inclined edge of SNCR inlets, which has never been reported before. Based on this, the optimization of urea injections was conducted, which could save 15.7% of the urea solution consumption while ensuring ultra-low emission of NO x .

Suggested Citation

  • Jin Yan & Xiaofeng Lu & Changfei Zhang & Qianjun Li & Jinping Wang & Shirong Liu & Xiong Zheng & Xuchen Fan, 2021. "An Experimental Study on the Characteristics of NO x Distributions at the SNCR Inlets of a Large-Scale CFB Boiler," Energies, MDPI, vol. 14(5), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:5:p:1267-:d:505701
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    References listed on IDEAS

    as
    1. Jin Yan & Xiaofeng Lu & Xiong Zheng & Rui Xue & Xiujian Lei & Xuchen Fan & Shirong Liu, 2020. "Experimental Investigations on Lateral Dispersion Coefficients of Fuel Particles in Large-Scale Circulating Fluidized Bed Boilers with Different Coal Feeding Modes," Energies, MDPI, vol. 13(23), pages 1-17, December.
    2. Blaszczuk, Artur & Pogorzelec, Michal & Shimizu, Tadaaki, 2018. "Heat transfer characteristics in a large-scale bubbling fluidized bed with immersed horizontal tube bundles," Energy, Elsevier, vol. 162(C), pages 10-19.
    3. Xuemin Liu & Hairui Yang & Junfu Lyu, 2020. "Optimization of Fluidization State of a Circulating Fluidized Bed Boiler for Economical Operation," Energies, MDPI, vol. 13(2), pages 1-20, January.
    4. Yan, Jin & Lu, Xiaofeng & Song, Yangfan & Zheng, Xiong & Lei, Xiujian & Liu, Zhuo & Fan, Xuchen & Liu, Congcong, 2021. "A comprehensive understanding of the non-uniform characteristics and regulation mechanism of six external loops in a 600 MW supercritical CFB boiler," Energy, Elsevier, vol. 222(C).
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    Cited by:

    1. Xiaoliang Yu & Jin Yan & Rongyue Sun & Lin Mei & Yanmin Li & Shuyuan Wang & Fan Wang & Yicheng Gu, 2023. "An Experimental Study on SO 2 Emission and Ash Deposition Characteristics of High Alkali Red Mud under Large Proportional Co-Combustion Conditions in Fluidized Bed," Energies, MDPI, vol. 16(6), pages 1-17, March.
    2. Xiong Zheng & Jin Yan & Jinping Wang & Xiaofeng Lu, 2021. "Numerical Study of the Influence of Secondary Air Uniformity on Jet Penetration and Gas-Solid Diffusion Characteristics in a Large-Scale CFB Boiler," Energies, MDPI, vol. 14(18), pages 1-19, September.
    3. Boyu Deng & Yi Zhang & Hairui Yang, 2022. "Operation Optimization of Circulating Fluidized Bed Boilers Integration of Variable Renewables," Energies, MDPI, vol. 15(16), pages 1-3, August.

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