skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Synergistic effect of mixing dimethyl ether with methane, ethane, propane, and ethylene fuels on polycyclic aromatic hydrocarbon and soot formation

Abstract

Characteristics of polycyclic aromatic hydrocarbon (PAH) and soot formation in counterflow diffusion flames of methane, ethane, propane, and ethylene fuels mixed with dimethyl ether (DME) have been investigated. Planar laser-induced incandescence and fluorescence techniques were employed to measure relative soot volume fractions and PAH concentrations, respectively. Results showed that even though DME is known to be a clean fuel in terms of soot formation, DME mixture with ethylene fuel increases PAH and soot formation significantly as compared to the pure ethylene case, while the mixture of DME with methane, ethane, and propane decreases PAH and soot formation. Numerical calculations adopting a detailed kinetics showed that DME can be decomposed to produce a relatively large number of methyl radicals in the low-temperature region where PAH forms and grows; thus the mixture of DME with ethylene increases CH{sub 3} radicals significantly in the PAH formation region. Considering that the increase in the concentration of O radicals is minimal in the PAH formation region with DME mixture, the enhancement of PAH and soot formation in the mixture flames of DME and ethylene can be explained based on the role of methyl radicals in PAH and soot formation. Methyl radicals can increase the concentrationmore » of propargyls, which could enhance incipient benzene ring formation through the propargyl recombination reaction and subsequent PAH growth. Thus, the result substantiates the importance of methyl radicals in PAH and soot formation, especially in the PAH formation region of diffusion flames. (author)« less

Authors:
 [1];  [2];  [3]
  1. Corporate Research and Development Division, Hyundai-Kia Motors, Gyeonggi-do 445-706 (Korea)
  2. Korea Electric Power Research Institute, Daejeon 305-380 (Korea)
  3. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742 (Korea)
Publication Date:
OSTI Identifier:
21081123
Resource Type:
Journal Article
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 154; Journal Issue: 3; Other Information: Elsevier Ltd. All rights reserved; Journal ID: ISSN 0010-2180
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; METHYL ETHER; POLYCYCLIC AROMATIC HYDROCARBONS; DME; ETHYLENE; METHYL RADICALS; ETHANE; METHANE; PROPANE; SOOT; MIXTURES; BENZENE; DIFFUSION; MIXING; COMBUSTION KINETICS; RECOMBINATION; SYNTHESIS; Counterflow diffusion flames; Synergistic effects

Citation Formats

Yoon, S S, Anh, D H, and Chung, S H. Synergistic effect of mixing dimethyl ether with methane, ethane, propane, and ethylene fuels on polycyclic aromatic hydrocarbon and soot formation. United States: N. p., 2008. Web. doi:10.1016/J.COMBUSTFLAME.2008.04.019.
Yoon, S S, Anh, D H, & Chung, S H. Synergistic effect of mixing dimethyl ether with methane, ethane, propane, and ethylene fuels on polycyclic aromatic hydrocarbon and soot formation. United States. https://doi.org/10.1016/J.COMBUSTFLAME.2008.04.019
Yoon, S S, Anh, D H, and Chung, S H. 2008. "Synergistic effect of mixing dimethyl ether with methane, ethane, propane, and ethylene fuels on polycyclic aromatic hydrocarbon and soot formation". United States. https://doi.org/10.1016/J.COMBUSTFLAME.2008.04.019.
@article{osti_21081123,
title = {Synergistic effect of mixing dimethyl ether with methane, ethane, propane, and ethylene fuels on polycyclic aromatic hydrocarbon and soot formation},
author = {Yoon, S S and Anh, D H and Chung, S H},
abstractNote = {Characteristics of polycyclic aromatic hydrocarbon (PAH) and soot formation in counterflow diffusion flames of methane, ethane, propane, and ethylene fuels mixed with dimethyl ether (DME) have been investigated. Planar laser-induced incandescence and fluorescence techniques were employed to measure relative soot volume fractions and PAH concentrations, respectively. Results showed that even though DME is known to be a clean fuel in terms of soot formation, DME mixture with ethylene fuel increases PAH and soot formation significantly as compared to the pure ethylene case, while the mixture of DME with methane, ethane, and propane decreases PAH and soot formation. Numerical calculations adopting a detailed kinetics showed that DME can be decomposed to produce a relatively large number of methyl radicals in the low-temperature region where PAH forms and grows; thus the mixture of DME with ethylene increases CH{sub 3} radicals significantly in the PAH formation region. Considering that the increase in the concentration of O radicals is minimal in the PAH formation region with DME mixture, the enhancement of PAH and soot formation in the mixture flames of DME and ethylene can be explained based on the role of methyl radicals in PAH and soot formation. Methyl radicals can increase the concentration of propargyls, which could enhance incipient benzene ring formation through the propargyl recombination reaction and subsequent PAH growth. Thus, the result substantiates the importance of methyl radicals in PAH and soot formation, especially in the PAH formation region of diffusion flames. (author)},
doi = {10.1016/J.COMBUSTFLAME.2008.04.019},
url = {https://www.osti.gov/biblio/21081123}, journal = {Combustion and Flame},
issn = {0010-2180},
number = 3,
volume = 154,
place = {United States},
year = {2008},
month = {8}
}