Ignition/Devolatilization Characteristic of Coal under High Pressure Oxy-Fuel Combustion

  • FANG Dongdong ,
  • DUAN Yuanqiang ,
  • ZHOU Minmin ,
  • DUAN Lunbo
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  • Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

网络出版日期: 2025-10-29

基金资助

This work was supported by the Funded by Basic Research Program of Jiangsu (Grants No BK20210238), the National Natural Science Foundation of China (52406127), and Postgraduate Research & Practice Innovation Program of Jiangsu Province (5003002304).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

Ignition/Devolatilization Characteristic of Coal under High Pressure Oxy-Fuel Combustion

  • FANG Dongdong ,
  • DUAN Yuanqiang ,
  • ZHOU Minmin ,
  • DUAN Lunbo
Expand
  • Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

Online published: 2025-10-29

Supported by

This work was supported by the Funded by Basic Research Program of Jiangsu (Grants No BK20210238), the National Natural Science Foundation of China (52406127), and Postgraduate Research & Practice Innovation Program of Jiangsu Province (5003002304).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

摘要

加压富氧燃烧是一种潜在的具有高效二氧化碳捕获能力的燃烧技术。然而由于实验难度大,目前关于其基础实验研究有限,主要集中在低压区间,对高压环境下研究则相对匮乏。由于点火和挥发分析出是煤燃烧过程中的初始步骤,对燃烧过程影响重大,本研究利用可视化高压沉降炉在0.1至4 MPa的压力条件下,考察了烟煤和无烟煤颗粒在O2/CO2条件下的点火和挥发分析出特性。通过捕捉煤在高压环境下的动态燃烧过程,确定了单颗粒煤的点火延迟时间和挥发分析出时间。结果表明,在固定氧气浓度下,煤颗粒的点火延迟时间会比常压环境更长,烟煤和无烟煤分别表现出均相点火和非均相点火的特性。烟煤的点火延迟时间在初始时刻迅速增加,随后逐渐降低,与0.1 MPa压力下的富氧燃烧相比,气相性质的剧烈变化和挥发物的释放是导致着火延迟增加的主要因素,同时氧分压的增加和更高的换热系数,促进了挥发物的着火,从而缩短了更高压力下的点火延迟时间。此外,烟煤的脱挥发分时间与压力呈正相关,在4 MPa时约为常压下的两倍。这项关于高压下煤着火和脱挥发分的研究加深了对加压富氧燃烧特性的理解,为加压富氧燃烧的应用提供了有力的基础。

本文引用格式

FANG Dongdong , DUAN Yuanqiang , ZHOU Minmin , DUAN Lunbo . Ignition/Devolatilization Characteristic of Coal under High Pressure Oxy-Fuel Combustion[J]. 热科学学报, 2025 , 34(6) : 2250 -2261 . DOI: 10.1007/s11630-025-2207-1

Abstract

Pressurized oxy-fuel combustion is a potential combustion technology with high efficiency and low-cost CO2 capture capacity. However, there is currently limited research on the basic experimental due to the difficulty of experiments, with the predominant focus residing in low-pressure regimes and a dearth of exploration in high-pressure environments. Since the ignition and devolatilization is as the initial step, contributes significantly to the process of coal combustion, this study examines the ignition and devolatilization characteristics of single bituminous coal and anthracite particles in O2/CO2 condition under pressures of 0.1 to 4 MPa using a visualized high-pressure drop tube furnace (HP-DTF). The dynamic combustion process at this high-pressure environment is captured, facilitating the determination of ignition delay time (IDT) and devolatilization time (DT) of single-particle coal. The results demonstrate that the IDT of coal particles will be lengthened relative to the ambient pressure under the fixed oxygen volume fraction. Bituminous coal and anthracite exhibit homogeneous ignition and heterogeneous ignition respectively. Bituminous coal initially experiences a rapid increase in IDT, followed by a gradual decrease; the drastic change of gas phase properties and the release of volatiles are the main factors leading to the increase of ignition delay, comparing to with 0.1 MPa pressured oxy-fuel combustion. The promotion of volatile ignition occurs as a result of increased oxygen partial pressure and a higher heat transfer coefficient, which leads to the shortening of the subsequent IDT. Also, the devolatilization time of bituminous coal showed a positive correlation with pressure, and the value at 4 MPa is about twice that at atmospheric pressure. In summary, this study of the coal ignition deepens the understanding of flame characteristics in the pressure oxygen combustion, which lays a solid foundation for the future pressured oxy-fuel combustion industrial application.

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