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Journal of Thermal Science

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2025 , Vol. 34 >Issue 2: 653 - 671

DOI: https://doi.org/10.1007/s11630-025-2021-9

燃烧和反应

Jet Flame Characteristics of High-Temperature Gas-Solid Mixed Fuels

  • LU Yu ,
  • FANG Neng ,
  • LI Wei ,
  • GUO Shuai ,
  • WU Yujun ,
  • HU Yujie ,
  • REN Qiangqiang
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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. State Key Laboratory of Coal Conversion, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    4. College of Coal Engineering, Shanxi Datong University, Datong 037003, China

网络出版日期: 2025-03-05

基金资助

This study is supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant number XDA29020300), CAS Project for Young Scientists in Basic Research (Grant number YSBR-028) and Youth Innovation Promotion Association CAS (Grant number 2020150).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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Jet Flame Characteristics of High-Temperature Gas-Solid Mixed Fuels

  • LU Yu ,
  • FANG Neng ,
  • LI Wei ,
  • GUO Shuai ,
  • WU Yujun ,
  • HU Yujie ,
  • REN Qiangqiang
Expand
  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. State Key Laboratory of Coal Conversion, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    4. College of Coal Engineering, Shanxi Datong University, Datong 037003, China

Online published: 2025-03-05

Supported by

This study is supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant number XDA29020300), CAS Project for Young Scientists in Basic Research (Grant number YSBR-028) and Youth Innovation Promotion Association CAS (Grant number 2020150).

Copyright

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

预热燃烧/气化技术实现了对煤炭资源的高效和清洁利用，但该对技术产生的高温气固混合燃料的流动和反应特性的研究仍需要深入探索。鉴于火焰能够直观的反映燃料与氧化剂的射流、掺混以及反应过程，故本研究依托自主设计搭建的试验平台，探究了高温气固混合燃料的射流火焰特性。本研究聚焦于燃料的高温和气固混合特性，这显著区别于传统燃料。为此，首先进行了定性对比分析，揭示了高温气固混合燃料相较于传统燃料在射流火焰特性上的差异。初步结果表明，高温气固复合燃料表现出比煤粉更高的反应性和更快的反应速率，因此在火焰形态、着火延迟、着火模式等方面展现出了不同的特性。此外，高温气固复合燃料的射流火焰形态与煤粉群燃烧火焰相仿，呈现出类似气体燃料火焰的连续云状结构，且火焰图像无明显着火延迟现象。基于以上结果，本研究定量分析了不同二次风当量比和一次风当量比下高温气固混合燃料射流火焰的几何参数、温度分布和振荡频率，以更深入了解操作参数对燃烧/气化过程的影响。

关键词： high-temperature gas-solid mixed fuel; jet flame; geometric parameters; temperature distribution; oscillation frequency

本文引用格式

LU Yu , FANG Neng , LI Wei , GUO Shuai , WU Yujun , HU Yujie , REN Qiangqiang . Jet Flame Characteristics of High-Temperature Gas-Solid Mixed Fuels[J]. 热科学学报, 2025 , 34(2) : 653 -671 . DOI: 10.1007/s11630-025-2021-9

Abstract

Preheating combustion/gasification technology enables efficient and environmentally friendly utilization of coal resources, but the research on the flow and reaction characteristics of high-temperature gas-solid mixed fuels produced by the technology still needs to be further explored. The flame can intuitively show the jet, mixing and reaction of fuel and oxidant at the outlet of the burner. Therefore, this study investigates the jet flame characteristics of high-temperature gas-solid mixed fuels on a self-designed test platform. High temperature and gas-solid mixing are the special features of the fuel in this study, which are different from other studies. Therefore, we first qualitatively compare the jet flame characteristics of high-temperature gas-solid mixed fuel with traditional fuel. The preliminary results indicate that high-temperature gas-solid mixed fuels exhibit higher reactivity and a faster reaction rate compared to pulverized coal. As a result, it shows different characteristics in flame shape, ignition delay and ignition mode. The jet flame shape of high-temperature gas-solid mixed fuels closely resembles that of the pulverized coal group combustion flame, displaying a continuous cloud-like structure similar to the shape of a gas-fueled flame. Furthermore, the flame image does not show any significant ignition delay phenomenon. Building upon these results, this study also quantitatively analyzes the geometric parameters, temperature distribution and oscillation frequency of the high-temperature gas-solid mixed fuel jet flame under different secondary air equivalence ratios and primary air equivalence ratios, so that we can have a deeper understanding of the influence of operating parameters on the combustion/gasification process.

Key words： high-temperature gas-solid mixed fuel; jet flame; geometric parameters; temperature distribution; oscillation frequency

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