Structural Characteristics of Methanol/Biodiesel Combustion Particles

doi:10.7652/xjtuxb201605012

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Structural Characteristics of Methanol/Biodiesel Combustion Particles

更新时间：2025-05-08

- Structural Characteristics of Methanol/Biodiesel Combustion Particles
- Vol. 50, Issue 5, Pages: 81-86(2016)
- 作者机构：
  
  江苏大学汽车与交通工程学院,江苏,镇江,212013
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201605012
  CLC： TK421
- Online First：10 May 2016，
  
  Published：2016
- 稿件说明：
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Structural Characteristics of Methanol/Biodiesel Combustion Particles[J]. 2016, 50(5): 81-86.
DOI：

Structural Characteristics of Methanol/Biodiesel Combustion Particles[J]. 2016, 50(5): 81-86. DOI： 10.7652/xjtuxb201605012.

摘要

为探讨甲醇对生物柴油颗粒形成的作用机理

采用扫描电镜(SEM)与X射线小角散射(SAXS)相结合的方法

针对颗粒的微观形貌以及孔隙结构

分析了甲醇对生物柴油燃烧颗粒的散射强度、回转半径、平均半径等参数的影响; 通过引入分形理论

探明不同甲醇掺混比的生物柴油燃烧颗粒的形态特征。结果表明:SAXS的粒径测量结果与电镜图像上的测试结果具有良好的一致性; 生物柴油燃烧颗粒表面附着较多的未燃可溶有机物

促进了颗粒间的凝并与生长

形成的颗粒粒径较大; 随着生物柴油中甲醇掺混比的提高

燃烧颗粒的散射强度逐渐增强

回转、平均半径逐渐减小

通过回转半径求得的B100、BM10、BM20燃烧颗粒的平均半径分别为17、16.4、15.9 nm; 随甲醇掺混比的增加

颗粒的质量分形维数逐渐增大

表面分形维数逐渐减小

生物柴油中掺混甲醇后

燃烧产生的颗粒结构变得更加紧凑

质量分布更加均匀。该研究可为在控制NO

排放的基础上降低柴油机颗粒排放提供参考依据。

Abstract

In order to investigate the effect of methanol on the formation of biodiesel particles

scanning electron microscope(SEM)and X-ray small angle scattering(SAXS)were used to analyze the effects of methanol on the scattering intensity

gyration radius and average radius of biodiesel combustion particles by observing the micro morphology and pore structure of particles. With the introduction of fractal theory

morphological features of biodiesel combustion particles were explored with different mixing ratios of methanol. The results showed that the measurement results of particle size of SAXS were consistent with SEM images. There were a large amount of unburned soluble organic matters adhered on the s

urface of biodiesel combustion particles. These unburned soluble organic matters could promote the coalescence and growth of particles as well as the formation of large-sized particles. With the increase of methanol composition in biodiesel mixture

the combustion particles' scattering intensity was gradually enhanced

and the gyration radius and average radius were decreased. The average radius of B100

BM10

and BM20 combustion particles were 17 nm

16.4 nm

and 15.9 nm

respectively by calculating the radius of gyration. With the increase of methanol mixing ratio

the mass fractal dimension of combustion particles increased gradually

and the surface fractal dimension decreased. Mixing with methanol

the biodiesel leaded to more compact structure of particles and more uniform mass distribution. This study based on the control of NO

emissions could provide an approach to reducing diesel particulate emission.

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