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

Jin Yan, Xiaofeng Lu, Changfei Zhang, Qianjun Li, Jinping Wang, Shirong Liu, Xiong Zheng and Xuchen Fan
Additional contact information
Jin Yan: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, 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
Qianjun Li: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, 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

Energies, 2021, vol. 14, issue 5, 1-15

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 .

Keywords: large-scale CFB; NO x distribution; SNCR; urea optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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