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Experimental investigation of methanol compression ignition in a high compression ratio HD engine using a Box-Behnken design

Shamun, Sam LU ; Haşimoğlu, Can; Murcak, Ahmet; Andersson, Öivind LU ; Tunér, Martin LU and Tunestål, Per LU (2017) In Fuel 209. p.624-633
Abstract

Methanol is an alternative fuel offering a lower well-to-wheel CO2 emission as well as a higher efficiency, given that the fuel is derived from biomass. In addition to reduced CO2, methanol does not emit soot particles when combusted which is a great advantage when attempting to reduce NOX levels due to the effectively non-existing NOX-soot trade-off. The engine setup used was a Scania D13 engine modified to run on one cylinder, utilizing a high compression piston with a rc of 27:1. This study analyzes the effects of four control parameters on gross indicated efficiency and the indicated specific emissions; CO, THC and NOX. The control parameters chosen in this work was... (More)

Methanol is an alternative fuel offering a lower well-to-wheel CO2 emission as well as a higher efficiency, given that the fuel is derived from biomass. In addition to reduced CO2, methanol does not emit soot particles when combusted which is a great advantage when attempting to reduce NOX levels due to the effectively non-existing NOX-soot trade-off. The engine setup used was a Scania D13 engine modified to run on one cylinder, utilizing a high compression piston with a rc of 27:1. This study analyzes the effects of four control parameters on gross indicated efficiency and the indicated specific emissions; CO, THC and NOX. The control parameters chosen in this work was common rail pressure (PRAIL), EGR, λ and CA50, running at 6 bar IMEPG and 1200 rpm. The effects of the control parameters on performance and emissions was analyzed using a surface response method of the Box-Behnken type. Predictive mathematical models were obtained from regression analysis performed on the responses from the experiments. The highest gross indicated efficiency achieved was ∼53%, when a high level of EGR was applied together with the combustion phasing set to its low level at CA50 = 6 CAD ATDC. The control parameters influencing the CO emissions are λ and the interaction between PRAIL and λ, while THC is only controlled by PRAIL and EGR. NOX emissions was, as expected, influenced mainly by EGR and λ, although PRAIL and CA50 also had minor effects. The effect of increased PRAIL, increased THC emissions which in its turn reduced the gross indicated efficiency. Throughout the experiment, THC concentration never decreased below ∼150 ppm due to utilization of high rc in combination with the volatility of methanol. It was also concluded that a rc = 27 is rather high if operation flexibility is required, especially at the higher load range.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Biofuel, Box-Behnken, Efficiency, Emissions, High compression ratio, Methanol
in
Fuel
volume
209
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85027403395
ISSN
0016-2361
DOI
10.1016/j.fuel.2017.08.039
language
English
LU publication?
yes
id
5123be4c-24b8-45ba-81a2-079fc7f6a90c
date added to LUP
2017-08-24 15:16:44
date last changed
2017-08-24 15:51:49
@article{5123be4c-24b8-45ba-81a2-079fc7f6a90c,
  abstract     = {<p>Methanol is an alternative fuel offering a lower well-to-wheel CO<sub>2</sub> emission as well as a higher efficiency, given that the fuel is derived from biomass. In addition to reduced CO<sub>2</sub>, methanol does not emit soot particles when combusted which is a great advantage when attempting to reduce NO<sub>X</sub> levels due to the effectively non-existing NO<sub>X</sub>-soot trade-off. The engine setup used was a Scania D13 engine modified to run on one cylinder, utilizing a high compression piston with a r<sub>c</sub> of 27:1. This study analyzes the effects of four control parameters on gross indicated efficiency and the indicated specific emissions; CO, THC and NO<sub>X</sub>. The control parameters chosen in this work was common rail pressure (P<sub>RAIL</sub>), EGR, λ and CA50, running at 6 bar IMEP<sub>G</sub> and 1200 rpm. The effects of the control parameters on performance and emissions was analyzed using a surface response method of the Box-Behnken type. Predictive mathematical models were obtained from regression analysis performed on the responses from the experiments. The highest gross indicated efficiency achieved was ∼53%, when a high level of EGR was applied together with the combustion phasing set to its low level at CA50 = 6 CAD ATDC. The control parameters influencing the CO emissions are λ and the interaction between P<sub>RAIL</sub> and λ, while THC is only controlled by P<sub>RAIL</sub> and EGR. NO<sub>X</sub> emissions was, as expected, influenced mainly by EGR and λ, although P<sub>RAIL</sub> and CA50 also had minor effects. The effect of increased P<sub>RAIL</sub>, increased THC emissions which in its turn reduced the gross indicated efficiency. Throughout the experiment, THC concentration never decreased below ∼150 ppm due to utilization of high r<sub>c</sub> in combination with the volatility of methanol. It was also concluded that a r<sub>c</sub> = 27 is rather high if operation flexibility is required, especially at the higher load range.</p>},
  author       = {Shamun, Sam and Haşimoğlu, Can and Murcak, Ahmet and Andersson, Öivind and Tunér, Martin and Tunestål, Per},
  issn         = {0016-2361},
  keyword      = {Biofuel,Box-Behnken,Efficiency,Emissions,High compression ratio,Methanol},
  language     = {eng},
  pages        = {624--633},
  publisher    = {Elsevier},
  series       = {Fuel},
  title        = {Experimental investigation of methanol compression ignition in a high compression ratio HD engine using a Box-Behnken design},
  url          = {http://dx.doi.org/10.1016/j.fuel.2017.08.039},
  volume       = {209},
  year         = {2017},
}