Laminar burning characteristics of upgraded biomass pyrolysis fuel derived from rice husk at elevated pressures and temperatures

Cangsu Xu, Anhao Zhong, Xiaolu Li, Chongming Wang, Amrit Sahu, Hongming Xu, Thomas Lattimore, Kangquan Zhou, Yuqi Huang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Biomass energy is an emerging alternative energy source with an attractive carbon balance in its life cycle. Recently, a biomass fast pyrolysis fuel was produced from rice husk, and it was further upgraded using supercritical ethanol with a 5%Pt/SO42−/ZrO2/SBA-15 catalyst in a hydrogen atmosphere. This upgraded biomass pyrolysis fuel is mainly composed of ethers, esters, alcohols and ketones. After analysing the composition of this upgraded biomass pyrolysis fuel, the authors reproduced a mixed fuel to mimic the upgraded biomass pyrolysis fuel. This mixed fuel contained ethanol, ethyl acetate, diethyl ether, acetone, and 2-butanone, with mass ratios of 9:6:2:1:1. This fuel has been used in a gasoline engine with some minor modifications; however, there is no data available for its laminar burning characteristics. In this study, the laminar burning characteristics of this mixed fuel were investigated in a constant volume combustion chamber (CVCC) at an initial pressure of 0.1 MPa and initial temperatures of 358, 388 and 418 K), and at an initial temperature of 358 K and initial pressures of 0.1, 0.2 and 0.4 MPa. By using a Schlieren high-speed imaging technique and a linear extrapolation method, laminar burning characteristics including the unstretched flame propagation speed, laminar burning velocity and other key parameters were calculated and discussed. Experiments were also conducted for two main components, ethanol and ethyl acetate, and results were used as benchmarks. The results indicated that the peak laminar burning velocity of the mixed fuel can be observed near the equivalence ratio of 1.1 under the tested conditions. At the same equivalence ratio, the laminar burning velocity was increased as initial temperature was increased, and it was decreased as initial pressure was increased. Markstein length decreased as equivalence ratio was increased, and it dropped below zero when the equivalence ratio was 1.4, indicating increased flame instability with equivalence ratio increased. Among the three examined fuels, the laminar burning velocity ranking was: ethanol > mixed fuel > ethyl acetate.
Original languageEnglish
Pages (from-to)249-261
Number of pages13
JournalFuel
Volume210
Early online date31 Aug 2017
DOIs
Publication statusPublished - 15 Dec 2017
Externally publishedYes

Fingerprint

Biomass
Pyrolysis
Temperature
Ethanol
Ethers
Ethanol fuels
Combustion chambers
Acetone
Ketones
Extrapolation
Ether
Gasoline
Life cycle
Hydrogen
Esters
Alcohols
Carbon
Engines
Imaging techniques
Catalysts

Keywords

  • Biomass
  • Laminar burning characteristics
  • Rice husk
  • Schlieren high-speed imaging

Cite this

Laminar burning characteristics of upgraded biomass pyrolysis fuel derived from rice husk at elevated pressures and temperatures. / Xu, Cangsu; Zhong, Anhao; Li, Xiaolu; Wang, Chongming; Sahu, Amrit; Xu, Hongming; Lattimore, Thomas; Zhou, Kangquan; Huang, Yuqi.

In: Fuel, Vol. 210, 15.12.2017, p. 249-261.

Research output: Contribution to journalArticle

Xu, Cangsu ; Zhong, Anhao ; Li, Xiaolu ; Wang, Chongming ; Sahu, Amrit ; Xu, Hongming ; Lattimore, Thomas ; Zhou, Kangquan ; Huang, Yuqi. / Laminar burning characteristics of upgraded biomass pyrolysis fuel derived from rice husk at elevated pressures and temperatures. In: Fuel. 2017 ; Vol. 210. pp. 249-261.
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T1 - Laminar burning characteristics of upgraded biomass pyrolysis fuel derived from rice husk at elevated pressures and temperatures

AU - Xu, Cangsu

AU - Zhong, Anhao

AU - Li, Xiaolu

AU - Wang, Chongming

AU - Sahu, Amrit

AU - Xu, Hongming

AU - Lattimore, Thomas

AU - Zhou, Kangquan

AU - Huang, Yuqi

PY - 2017/12/15

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N2 - Biomass energy is an emerging alternative energy source with an attractive carbon balance in its life cycle. Recently, a biomass fast pyrolysis fuel was produced from rice husk, and it was further upgraded using supercritical ethanol with a 5%Pt/SO42−/ZrO2/SBA-15 catalyst in a hydrogen atmosphere. This upgraded biomass pyrolysis fuel is mainly composed of ethers, esters, alcohols and ketones. After analysing the composition of this upgraded biomass pyrolysis fuel, the authors reproduced a mixed fuel to mimic the upgraded biomass pyrolysis fuel. This mixed fuel contained ethanol, ethyl acetate, diethyl ether, acetone, and 2-butanone, with mass ratios of 9:6:2:1:1. This fuel has been used in a gasoline engine with some minor modifications; however, there is no data available for its laminar burning characteristics. In this study, the laminar burning characteristics of this mixed fuel were investigated in a constant volume combustion chamber (CVCC) at an initial pressure of 0.1 MPa and initial temperatures of 358, 388 and 418 K), and at an initial temperature of 358 K and initial pressures of 0.1, 0.2 and 0.4 MPa. By using a Schlieren high-speed imaging technique and a linear extrapolation method, laminar burning characteristics including the unstretched flame propagation speed, laminar burning velocity and other key parameters were calculated and discussed. Experiments were also conducted for two main components, ethanol and ethyl acetate, and results were used as benchmarks. The results indicated that the peak laminar burning velocity of the mixed fuel can be observed near the equivalence ratio of 1.1 under the tested conditions. At the same equivalence ratio, the laminar burning velocity was increased as initial temperature was increased, and it was decreased as initial pressure was increased. Markstein length decreased as equivalence ratio was increased, and it dropped below zero when the equivalence ratio was 1.4, indicating increased flame instability with equivalence ratio increased. Among the three examined fuels, the laminar burning velocity ranking was: ethanol > mixed fuel > ethyl acetate.

AB - Biomass energy is an emerging alternative energy source with an attractive carbon balance in its life cycle. Recently, a biomass fast pyrolysis fuel was produced from rice husk, and it was further upgraded using supercritical ethanol with a 5%Pt/SO42−/ZrO2/SBA-15 catalyst in a hydrogen atmosphere. This upgraded biomass pyrolysis fuel is mainly composed of ethers, esters, alcohols and ketones. After analysing the composition of this upgraded biomass pyrolysis fuel, the authors reproduced a mixed fuel to mimic the upgraded biomass pyrolysis fuel. This mixed fuel contained ethanol, ethyl acetate, diethyl ether, acetone, and 2-butanone, with mass ratios of 9:6:2:1:1. This fuel has been used in a gasoline engine with some minor modifications; however, there is no data available for its laminar burning characteristics. In this study, the laminar burning characteristics of this mixed fuel were investigated in a constant volume combustion chamber (CVCC) at an initial pressure of 0.1 MPa and initial temperatures of 358, 388 and 418 K), and at an initial temperature of 358 K and initial pressures of 0.1, 0.2 and 0.4 MPa. By using a Schlieren high-speed imaging technique and a linear extrapolation method, laminar burning characteristics including the unstretched flame propagation speed, laminar burning velocity and other key parameters were calculated and discussed. Experiments were also conducted for two main components, ethanol and ethyl acetate, and results were used as benchmarks. The results indicated that the peak laminar burning velocity of the mixed fuel can be observed near the equivalence ratio of 1.1 under the tested conditions. At the same equivalence ratio, the laminar burning velocity was increased as initial temperature was increased, and it was decreased as initial pressure was increased. Markstein length decreased as equivalence ratio was increased, and it dropped below zero when the equivalence ratio was 1.4, indicating increased flame instability with equivalence ratio increased. Among the three examined fuels, the laminar burning velocity ranking was: ethanol > mixed fuel > ethyl acetate.

KW - Biomass

KW - Laminar burning characteristics

KW - Rice husk

KW - Schlieren high-speed imaging

U2 - 10.1016/j.fuel.2017.08.050

DO - 10.1016/j.fuel.2017.08.050

M3 - Article

VL - 210

SP - 249

EP - 261

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -