Study of Diffusional Effect in Oxy-Fuel Combustion of Semi-Coke

doi:10.7652/xjtuxb201809021

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Study of Diffusional Effect in Oxy-Fuel Combustion of Semi-Coke

更新时间：2025-05-01

- Study of Diffusional Effect in Oxy-Fuel Combustion of Semi-Coke
- Vol. 52, Issue 9, Pages: 155-161(2018)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201809021
  CLC： TK16
- Online First：10 September 2018，
  
  Published：2018
- 稿件说明：
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Study of Diffusional Effect in Oxy-Fuel Combustion of Semi-Coke[J]. 2018, 52(9): 155-161.
DOI：

Study of Diffusional Effect in Oxy-Fuel Combustion of Semi-Coke[J]. 2018, 52(9): 155-161. DOI： 10.7652/xjtuxb201809021.

摘要

为探究富氧燃烧条件下半焦的燃烧特性

研究扩散效应对实验中半焦燃烧的影响

采用热重分析法探讨了扩散对半焦富氧燃烧特性的影响和相应的动力学分析

并对反应中的氧气扩散速率建立数学模型以进行分析。采用改变气氛、坩埚高度、坩埚直径和半焦质量的方法

研究了不同内外扩散速率条件下的半焦燃烧特性。热重实验结果表明:减小燃烧反应中的外扩散行程、增大半焦表面与氧气接触面积、减小半焦床层厚度、提高反应气氛氧含量

都能使扩散阻力减小

氧气扩散速率提高

燃尽温度降低

平均反应速率增大

燃烧特性指数提升

表观活化能增加

燃烧特性变好。实验结果可为半焦富氧燃烧利用和扩散效应的研究提供理论参考。

Abstract

To study the oxy-fuel(O

/CO

)combustion characteristics of semi-coke and analyze the diffusional effect

thermogravimetric analysis was used to explore the diffusional effect on the oxy-fuel combustion characteristics of semi-coke

and relevant kinetic analysis was performed. In addition

a mathematical model of oxygen diffusion rate in the reaction was established for analysis. The experiment investigated the combustion characteristics of semi-coke under changed conditions referring to the atmosphere

the height and diameter of crucible

and the mass of semi-coke at different internal and external diffusion rates. The results of thermogravimetric experiments show that with the reduction of external diffusion distance in the combustion reaction and the thickness of the semi-coke bed as well as the increase of contact area with oxyge

n on the surface of semi-coke and the oxygen concentration in the reaction atmosphere

the diffusion resistance and burnout temperature are decreased

while the oxygen diffusion rate

average reaction rate

combustion characteristic index and activation energy are all increased

and the combustion characteristics are improved. The experimental results may provide a theoretical reference for the application of oxy-fuel combustion of semi-coke and the study of diffusional effect.

关键词

Keywords

references

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Related Institution

School of Energy and Power Engineering，Xi’an Jiaotong University

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西安交通大学能源与动力工程学院，710049，西安School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China

河南机电职业学院，451192，郑州Henan Mechanical and Electrical Vocational College, Zhengzhou 451192, China

School of Energy and Power Engineering, Xi’an Jiaotong University

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