Chemical Reaction Kinetics Simulation Study on NO<sub><i>x</i></sub> Generation Characteristics of Coal Combustion Coupled with Ammonia Heterogeneous Reaction

YANG Kun; LIU Shi'en; DAI Liangxu; ZHANG Tao; WANG Chang'an; HOU Yujie; CHE Defu

doi:10.19805/j.cnki.jcspe.2026.250147

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Chemical Reaction Kinetics Simulation Study on NO_x Generation Characteristics of Coal Combustion Coupled with Ammonia Heterogeneous Reaction

更新时间：2026-06-11

- Chemical Reaction Kinetics Simulation Study on NO_x Generation Characteristics of Coal Combustion Coupled with Ammonia Heterogeneous Reaction
- Chinese Journal of Power Engineering Vol. 46, Issue 6, Pages: 168-179(2026)
- 作者机构：
  
  1. 上海发电设备成套设计研究院有限责任公司,上海,200240
  2. 西安交通大学能源与动力工程学院,陕西,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.250147
  CLC： TK11
- Published：2026
- 稿件说明：
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杨琨, 刘施恩, 戴良旭, 张涛, 王长安, 侯育杰, 车得福. 燃煤耦合氨气异相反应NOx生成特性化学反应动力学模拟研究[J]. 动力工程学报, 2026, 46(6): 168-179.
杨琨, 刘施恩, 戴良旭, 张涛, 王长安, 侯育杰, 车得福. 燃煤耦合氨气异相反应NOx生成特性化学反应动力学模拟研究[J]. 动力工程学报, 2026, 46(6): 168-179. DOI： 10.19805/j.cnki.jcspe.2026.250147.

DOI： 10.19805/j.cnki.jcspe.2026.250147

摘要

燃煤锅炉掺氨燃烧能有效减少碳排放

但可能导致掺烧过程NOx排放增多

而宽掺氨比例范围内煤质特性和氨分配策略对氨煤掺烧NOx生成特性的影响规律和反应机理尚需进一步研究。提出了一种氨煤异相反应模型

通过化学反应动力学模拟方法研究了掺混比例、煤质特性及氨分配策略对氨煤掺烧过程中NOx生成特性的影响。结果表明:NO排放量随NH3掺入量的增加先增多后减少

燃烧过程中NO的含量先迅速升高到峰值然后逐渐下降。氨掺混比例x=20%时

NO的转化率随煤挥发分质量分数的增加先增大后减小

而x=50%时NO的转化率先减小后增大。NO的转化率随氮质量分数的增加而增大。改变氨的分配策略

燃尽区NH3占比20%~60%时

NO与NO2的排放量均低于NH3全部随燃料进入主燃区燃烧工况。敏感性分析发现

氨气掺混燃烧时NH、NH2、N2H2等NH3衍生物以及OH、H等基团对NO的转化有较大影响。转化路径分析表明NH3→NH2→HNO/NH→NO

HCN→NCO→NO是NO生成的主要路径

HNO与NH是NO生成的关键物质

NH2、NH对NO的还原可以促进NO的消耗

从而减少氮氧化物的生成。研究有助于优化氨气的掺混比例和分配策略

从而进一步降低NOx排放

为实际锅炉氨煤耦合燃烧组织与参数选择提供理论支撑。

Abstract

Ammonia/coal co-firing in coal-fired boilers can effectively reduce carbon emission

but it may lead to an increase in NOx emission during the co-firing process. The influence of coal properties and ammonia distribution strategy on NOx generation characteristics and reaction mechanism of ammonia/coal co-firing over a wide range of ammonia co-firing ratios need to be investigated further. An ammonia/coal heterogeneous reaction model was proposed

and the effects of co-firing ratio

coal properties and ammonia distribution strategy on the NOx generation characteristics were investigated through the chemical reaction kinetics simulation method. Results show that the NO emission increases and then decreases with the increase of NH3 ratio

and the NO content in the combustion process first increases dramatically to the peak and then decreases gradually. The conversion rate of NO increases and then decreases with the increase of coal volatile matter mass fraction at NH3 ratio x=20%

while the conversion rate of NO decreases and then increases at x=50%. The conversion rate of NO increases with the increase of nitrogen mass fraction. By changing the ammonia distribution strategy

the emissions of both NO and NO2 are lower than that of all NH3 entering the main combustion area with the fuel when the proportion of NH3 in the burnout zone ranges from 20% to 60%. Sensitivity analysis reveals that NH3 derivatives such as NH

NH2

N2H2

as well as functional groups such as OH and H

have a significant impact on the conversion of NO during ammonia co-firing. The analysis of conversion pathways shows that NH3→NH2→HNO/NH→NO and HCN→NCO→NO are the main pathways for NO generation. HNO and NH are key substances for NO generation

and NO reduction by NH2 and NH can promote NO consumption

thereby reducing the generation of nitrogen oxides. The study is helpful to optimize the ammonia co-firing ratio and distribution strategy

thereby further reducing NOx emission and providing theoretical support for the organization and parameter selection of ammonia/coal coupled combustion in actual boilers.

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references

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Chemical Reaction Kinetics Simulation Study on NOx Generation Characteristics of Coal Combustion Coupled with Ammonia Heterogeneous Reaction

DOI：10.19805/j.cnki.jcspe.2026.250147

摘要

Abstract

关键词

Keywords

references

Chemical Reaction Kinetics Simulation Study on NO_x Generation Characteristics of Coal Combustion Coupled with Ammonia Heterogeneous Reaction