燃烧和反应

Micro Morphology of Soot Particles Sampled from High Pressure Jet Flames of Diesel from Direct Coal Liquefaction

  • WANG Tengfei ,
  • QIAO Xinqi ,
  • LI Tie ,
  • WU Gang ,
  • WANG Xinran
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  • 1. Key Laboratory of Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
    2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    3. Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China

网络出版日期: 2023-12-04

基金资助

This work is supported by the National Key Research and Development Program of China (Grant No. 2017YFE0130800) and National Natural Science Foundation of China (Grant No. 91741122).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Micro Morphology of Soot Particles Sampled from High Pressure Jet Flames of Diesel from Direct Coal Liquefaction

  • WANG Tengfei ,
  • QIAO Xinqi ,
  • LI Tie ,
  • WU Gang ,
  • WANG Xinran
Expand
  • 1. Key Laboratory of Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
    2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    3. Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China

Online published: 2023-12-04

Supported by

This work is supported by the National Key Research and Development Program of China (Grant No. 2017YFE0130800) and National Natural Science Foundation of China (Grant No. 91741122).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

煤直接液化柴油(DDCL)是一种新型的发动机替代能源。但其烃类组成和理化性质与石化柴油有较大差异。在本研究中,建立了带有碳烟颗粒采样装置的预混合定容燃烧室(CCVC)系统。利用热泳探针和透射电子显微镜(TEM)对喷雾火焰中的碳烟颗粒进行了取样和拍照。基于MATLAB软件开发了一个自动处理程序,用于处理TEM图像并提取碳烟颗粒的微观形貌参数。本文系统地研究了采样位置、喷射压力、环境密度和氧气浓度对碳烟颗粒微观形貌的影响。环境密度是指CVCC中的初始气体密度。结果表明,在喷雾火焰的上游,多种形态和尺寸的碳烟颗粒共存。在火焰中碳烟颗粒从上游到下游的演化过程中,碳烟团聚体的尺寸逐渐减小,而碳烟团聚体的成熟度逐渐增加。随着喷射压力、环境密度和氧气浓度的增加,碳烟团聚体和基元碳烟颗粒的平均尺寸逐渐减小,而碳烟团聚体的分形维数逐渐增大。在相同的燃烧条件和取样位置条件下,煤直接液化柴油生成的碳烟团聚体的平均投影面积、回转半径和基元颗粒直径显著低于石化柴油。煤直接液化柴油生成的碳烟颗粒比石化柴油生成的碳烟颗粒结构致密度更高。

本文引用格式

WANG Tengfei , QIAO Xinqi , LI Tie , WU Gang , WANG Xinran . Micro Morphology of Soot Particles Sampled from High Pressure Jet Flames of Diesel from Direct Coal Liquefaction[J]. 热科学学报, 2022 , 31(6) : 2155 -2170 . DOI: 10.1007/s11630-022-1666-x

Abstract

Diesel from direct coal liquefaction (DDCL) is a new type of engine alternative energy. But its hydrocarbon composition and physicochemical properties are quite different from those of Petro diesel. In this study, a premixed constant volume combustion chamber (CVCC) system with soot particle sampling devices was built. The soot particles in the spray flame were sampled and photographed by thermophoresis probe and transmission electron microscope (TEM). An automatic processing code based on Matlab software was developed to process the TEM images and extract the micro morphology parameters of the soot particles. This study has systematically studied the effects of sampling location, injection pressure, ambient density and oxygen concentration on the micro morphology of soot particles. The ambient density refers to the initial gas density in the CVCC. The results showed that various morphologies and sizes of soot particles coexisted in the upstream of the spray flame. During the evolution of soot particles from upstream to downstream in the flame, the size of soot aggregates gradually decreased, while the maturity of soot aggregates increased. With the increase of injection pressure, ambient density and oxygen concentration, the average sizes of soot aggregates and primary soot particles decreased, but the fractal dimensions of soot aggregates increased gradually. Under the same combustion condition and in-flame sampling location, the average projection area, gyration radius and primary soot diameter of soot aggregates produced by DDCL were significantly lower than those of Petro diesel. The structure of soot particles from DDCL was more compact than that of Petro diesel.

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