Research on prediction model of formation temperature of ammonium bisulfate in air preheater of coal-fired power plant

doi:10.1016/j.cjche.2021.09.018

Chinese Journal of Chemical Engineering ›› 2022, Vol. 48 ›› Issue (8): 202-210.DOI: 10.1016/j.cjche.2021.09.018

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Research on prediction model of formation temperature of ammonium bisulfate in air preheater of coal-fired power plant

Kai Zhang¹, Fangming Xue², Zhiqiang Wang¹, Xingxing Cheng¹

1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
2. Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China

Received:2021-03-27 Revised:2021-09-24 Online:2022-09-30 Published:2022-08-28
Contact: Zhiqiang Wang,E-mail:jackywzq@sdu.edu.cn;Xingxing Cheng,E-mail:xcheng@sdu.edu.cn
Supported by:
The authors would like to thank the Key Research and Development Plan of Shandong Province (2019GSF109004) and Natural Science Foundation of Shandong Province (ZR2020ME190) for funding and supporting this work.

Research on prediction model of formation temperature of ammonium bisulfate in air preheater of coal-fired power plant

Kai Zhang¹, Fangming Xue², Zhiqiang Wang¹, Xingxing Cheng¹

1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
2. Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China

通讯作者: Zhiqiang Wang,E-mail:jackywzq@sdu.edu.cn;Xingxing Cheng,E-mail:xcheng@sdu.edu.cn
基金资助:
The authors would like to thank the Key Research and Development Plan of Shandong Province (2019GSF109004) and Natural Science Foundation of Shandong Province (ZR2020ME190) for funding and supporting this work.

Abstract

Abstract: Ammonium bisulfate (ABS) is a viscous compound produced by the escape NH₃ in the NO reduction process and SO₃ in the flue gas at a certain temperature, which can cause the ash corrosion of the air preheater in coal-fired power plants. Therefore, it is essential to study the formation temperature of ABS to prevent the deposition of ABS in air preheaters. In this paper, the SO₃ reaction kinetic model is used to analyze the SO₃ generation process from coal combustion to the selective catalytic reduction (SCR) exit stage, and the kinetic model of NO reduction is used to analyze the NH₃ escape process. A prediction model for calculating the ABS formation temperature based on the S content in coal and NO reduction parameters of the SCR is proposed, solving the difficulty of measuring SO₃ concentration and NH₃ concentration in the previous calculation equation of ABS formation temperature. And the reliability of the model is verified by the actual data of the power plant. Then the influence of S content in coal, NH₃/ NO_x molar ratio, different NO_x concentrations at SCR inlet, and NO removal efficiency on the formation temperature of ABS are analyzed.

Key words: Air preheater, Ammonium bisulfate, ABS formation temperature, Reaction kinetics

摘要： Ammonium bisulfate (ABS) is a viscous compound produced by the escape NH₃ in the NO reduction process and SO₃ in the flue gas at a certain temperature, which can cause the ash corrosion of the air preheater in coal-fired power plants. Therefore, it is essential to study the formation temperature of ABS to prevent the deposition of ABS in air preheaters. In this paper, the SO₃ reaction kinetic model is used to analyze the SO₃ generation process from coal combustion to the selective catalytic reduction (SCR) exit stage, and the kinetic model of NO reduction is used to analyze the NH₃ escape process. A prediction model for calculating the ABS formation temperature based on the S content in coal and NO reduction parameters of the SCR is proposed, solving the difficulty of measuring SO₃ concentration and NH₃ concentration in the previous calculation equation of ABS formation temperature. And the reliability of the model is verified by the actual data of the power plant. Then the influence of S content in coal, NH₃/ NO_x molar ratio, different NO_x concentrations at SCR inlet, and NO removal efficiency on the formation temperature of ABS are analyzed.

关键词: Air preheater, Ammonium bisulfate, ABS formation temperature, Reaction kinetics

Kai Zhang, Fangming Xue, Zhiqiang Wang, Xingxing Cheng. Research on prediction model of formation temperature of ammonium bisulfate in air preheater of coal-fired power plant[J]. Chinese Journal of Chemical Engineering, 2022, 48(8): 202-210.

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Research on prediction model of formation temperature of ammonium bisulfate in air preheater of coal-fired power plant

Research on prediction model of formation temperature of ammonium bisulfate in air preheater of coal-fired power plant

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