Optimization of Fuel In-Situ Reduction (FISR) Denitrification Technology for Cement Kiln using CFD Method

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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Dalian National Laboratory for Clean Energy, Dalian 116023, China

网络出版日期: 2023-11-26

基金资助

This work is financially supported by “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences (Grant number XDA21040300), and Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant number Y201642).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Optimization of Fuel In-Situ Reduction (FISR) Denitrification Technology for Cement Kiln using CFD Method

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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Dalian National Laboratory for Clean Energy, Dalian 116023, China

Online published: 2023-11-26

Supported by

This work is financially supported by “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences (Grant number XDA21040300), and Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant number Y201642).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

水泥工业产生的氮氧化物(NOx)越来越受到重视,现有的脱硝技术难以满足中国日益严格的排放要求。在笔者团队之前发表的工作中,提出了燃料原位还原(FISR)方法来减少水泥NOx排放。本文以早前实验中的中试规模预分解炉为对象,应用CFD方法对FISR方法进行了优化。结果表明,采用FISR方法后,NOx排放降低了69.86%。另外,本文还进一步研究了窑气中NO和O2初始浓度、第一级三次风(三次风-I)和水泥生料(CRM)进料位置的影响。随着初始NO浓度的增加,NOx排放浓度线性增加,而窑气中NO的还原率保持在80%以上。当窑气中O2含量大于4%时,氧气的存在将显著促进NOx的形成并抑制NO的还原。本文引入了三次风-I和CRM无量纲进料位置,模拟结果表明,最佳的三次风-I和CRM无量纲进料位置分别为0.6和1.6。本文的研究成果将为FISR方法在水泥工业中的实际应用提供有力的支持。

本文引用格式

SHI Chaoting, CAI Jun, REN Qiangqiang, WU Huixing . Optimization of Fuel In-Situ Reduction (FISR) Denitrification Technology for Cement Kiln using CFD Method[J]. 热科学学报, 2023 , 32(6) : 2256 -2272 . DOI: 10.1007/s11630-023-1720-3

Abstract

Nitrogen oxides (NOx) from cement industry have drawn more and more attention and the existing denitrification technologies can hardly meet the increasingly stringent emission requirements in China. In our previous work, fuel in-situ reduction (FISR) method was proposed to cut cement NOx emission. With the pilot-scale precalciner in the previous experiment as objection, optimization of FISR method was conducted using CFD method. The results demonstrated that NOx emission decreased by 69.86% after adopting FISR method. The effects of initial concentrations of NO and O2 in kiln gas, feeding location of the first-stage tertiary (tertiary air-I) and cement raw meal (CRM) were further investigated. With increasing initial NO concentration, NOx emission increased linearly, while the reduction rate of NO in kiln gas maintained above 80%. When O2 content in kiln gas is more than 4%, oxygen would more significantly promote the formation of NOx and inhibit the reduction of NO. The dimensionless locations of tertiary air-I and CRM were introduced. The simulation results showed that the optimal dimensionless locations are 0.6 and 1.6 for tertiary air-I and CRM, respectively. The outputs achieved in this study will provide a strong support for the practical application of FISR method in cement industry.

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