Wide-load combustion characteristics of lean coal tangential preheating combustion

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2025-03-25 DOI:10.1016/j.energy.2025.135845

Shujun Zhu , Haoyang Zhou , Zhaoyang Li , Xiongwei Zeng , Ziqu Ouyang , Jicheng Hui , Jiangong Lin , Kun Su , Hongshuai Wang , Hongliang Ding , Qinggang Lyu

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引用次数: 0

Abstract

In this study, the preheating combustion technology is applied to pulverized coal tangential combustion, which is a main combustion mode of large-capacity pulverized coal boilers. The tangential combustion characteristics of pulverized coal and preheated fuel are compared, and wide-load coupled combustion characteristics are explored. The results demonstrate that the preheated fuel exhibited enhanced ignition and more stable combustion performance, which was advantageous for achieving deep and flexible peak shaving. Tangential preheating combustion system could realize the stable operation of 19 %–100 % combustion load. Compared to traditional pulverized coal burners, retrofitting the single-layer nozzle into a pre-circulating fluidized bed (PCFB) reduced NO_x emissions by about 28 % and increased combustion efficiency by approximately 1 %. Moreover, the stable coupled combustion of pulverized coal and preheated fuel confirmed the feasibility of retrofitting PCFB layers in coal-fired boilers with multi-layer nozzles. Additionally, reducing the combustion load lowered NO_x emissions but slightly decreased combustion efficiency. Furthermore, the diagonal operation of PCFBs could be used as an operating mode under ultra-low loads. The study demonstrates the viability of integrating preheating combustion technology and pulverized coal tangential combustion, proposing a novel low-load operation mode with potential application in coal-fired power plants.

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来源期刊

Energy 工程技术-能源与燃料

CiteScore

15.30

自引率

14.40%

发文量

审稿时长

14.2 weeks

期刊介绍： Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.