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Publications (10 of 58) Show all publications
Phounglamcheik, A. & Umeki, K. (2018). Change in size and density of a biomass char during heterogeneous reactions. In: : . Paper presented at 25th International conference on Chemical Reaction Engineering, Florence, Italy, 20-23 May 2018.
Open this publication in new window or tab >>Change in size and density of a biomass char during heterogeneous reactions
2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Chemical Engineering Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-70426 (URN)
Conference
25th International conference on Chemical Reaction Engineering, Florence, Italy, 20-23 May 2018
Available from: 2018-08-15 Created: 2018-08-15 Last updated: 2018-08-16Bibliographically approved
Trubetskaya, A., Kling, J., Umeki, K., Attard, T. M., Budarin, V. L. & Hunt, A. J. (2018). Effect of supercritical extraction on the soot nanostructure and gasification product yields. In: : . Paper presented at 37th International Symposium on Combustion, Dublin, Ireland, 29 July-3 August, 2018.
Open this publication in new window or tab >>Effect of supercritical extraction on the soot nanostructure and gasification product yields
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2018 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Chemical Engineering Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-70170 (URN)
Conference
37th International Symposium on Combustion, Dublin, Ireland, 29 July-3 August, 2018
Available from: 2018-07-27 Created: 2018-07-27 Last updated: 2018-08-08Bibliographically approved
Phounglamcheik, A., Wang, L., Romar, H., Broström, M., Ramser, K., Skreiberg, Ø. & Umeki, K. (2018). Effects of pyrolysis oil recycling and reaction gas atmosphere on the physical properties and reactivity of charcoal from wood. In: : . Paper presented at 22nd International Symposium on Analytical and Applied Pyrolysis, Kyoto, Japan, 3-8 June 2018.
Open this publication in new window or tab >>Effects of pyrolysis oil recycling and reaction gas atmosphere on the physical properties and reactivity of charcoal from wood
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2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Bioenergy Renewable Bioenergy Research Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-70428 (URN)
Conference
22nd International Symposium on Analytical and Applied Pyrolysis, Kyoto, Japan, 3-8 June 2018
Available from: 2018-08-15 Created: 2018-08-15 Last updated: 2018-08-16Bibliographically approved
Hardi, F., Imai, A., Theppitak, S., Kirtania, K., Furusjö, E., Umeki, K. & Yoshikawa, K. (2018). Gasification of Char Derived from Catalytic Hydrothermal Liquefaction of Pine Sawdust under a CO2 Atmosphere. Paper presented at 2nd International Conference on the Sustainable Energy and Environmental Development (SEED), Krakow, Poland, Nov 14-17 2017. Energy & Fuels, 32(5), 5999-6007
Open this publication in new window or tab >>Gasification of Char Derived from Catalytic Hydrothermal Liquefaction of Pine Sawdust under a CO2 Atmosphere
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2018 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 32, no 5, p. 5999-6007Article in journal (Refereed) Published
Abstract [en]

The integration between K2CO3 catalytic hydrothermal liquefaction (HTL) and gasification is explored to improve the gasification process. In this study, the CO2 gasification characteristics and the activation energies of the chars derived from four kinds of HTL products, black liquor (BL), and virgin pine sawdust (PS) are investigated non-isothermally using a thermogravimetric analyzer. The complete conversion of BL char and HTL product chars was achieved at lower temperatures (1150 K) than that of PS char (1300 K). BL char showed the highest derivative thermogravimetric (DTG) peak, an indicator of high reactivity, followed by HTL product chars and PS char. HTL liquid product chars exhibited the lowest DTG peak temperature (1023–1058 K), which is advantageous for the low-temperature gasification. The activation energies were calculated isoconversionally using the Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), and Starink approximations. On the basis of the KAS method, the range of the activation energy for the HTL aqueous product char sample was 127–259 kJ/mol, which was wider than that for BL char (171–190 kJ/mol). The HTL process can improve the gasification feedstock reactivity, and the use of the HTL liquid product allows for the gasification at a low temperature.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-68549 (URN)10.1021/acs.energyfuels.8b00589 (DOI)000432754700035 ()
Conference
2nd International Conference on the Sustainable Energy and Environmental Development (SEED), Krakow, Poland, Nov 14-17 2017
Note

Konferensartikel i tidskrift;2018-06-07 (andbra)

Available from: 2018-04-30 Created: 2018-04-30 Last updated: 2018-06-07Bibliographically approved
Phounglamcheik, A., Wretborn, T. & Umeki, K. (2018). Increasing efficiency of charcoal production with bio-oil recycling. Energy & Fuels, 32(9), 9650-9658
Open this publication in new window or tab >>Increasing efficiency of charcoal production with bio-oil recycling
2018 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 32, no 9, p. 9650-9658Article in journal (Refereed) Published
Abstract [en]

Charcoal from biomass is a promising alternative for fossil coal. Although its quality increases at high pyrolysis temperature, charcoal yield decreases, meaning lower economic performances of charcoal production processes. This work aims at demonstrating potential methods to increase charcoal yield while keeping its quality at satisfying levels. We suggested the recycling of bio-oil from pyrolysis process as a primary measure. In addition, we also investigated in detail the consequence of utilizing CO2 instead of N2 as reaction media under practical conditions (i.e. thick particles). An experimental investigation was carried out in a macro-thermogravimetric (macro-TG) reactor. Sample (woodchips, bio-oil, and woodchips embedded with bio-oil) was exposed to the reaction temperature either instantaneously (isothermal condition) or by slow heating (slow pyrolysis) in controlled gas flows of N2 and CO2. The results showed that char yield increases with the bio-oil recycling on wood chips at all pyrolysis temperatures (300–700 °C). By 20% of bio-oil embedding on wood chips, charcoal yield increased by 18.3% on average. The increase of charcoal yield was not only because of the increase in reactants, but also due to the synergetic effect between bio-oil and wood chips upon physical contact. Bio-oil recycling had negligible effects on the property of charcoal, such as carbon content and heating value. Although CO2 did not affect primary pyrolysis, it had effects on mass transfer processes. As a result, significantly higher char yield was obtained from pyrolysis in CO2 than in N2 by ensuring a good contact of volatiles and solid surface (i.e. usage of thick particles and slow heating). This study suggests that we can achieve high charcoal yield while maintaining the similar charcoal property by bio-oil recycling, CO2 purging, use of thick particles, and slow heating.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-70583 (URN)10.1021/acs.energyfuels.8b02333 (DOI)000445711700071 ()2-s2.0-85052873835 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-10-15 (johcin) 

Available from: 2018-08-24 Created: 2018-08-24 Last updated: 2018-10-24Bibliographically approved
Trubetskaya, A., Hofmann Larsen, F., Shchukarev, A., Ståhl, K. & Umeki, K. (2018). Potassium and soot interaction in fast biomass pyrolysis at high temperatures. Fuel, 225, 89-94
Open this publication in new window or tab >>Potassium and soot interaction in fast biomass pyrolysis at high temperatures
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2018 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 225, p. 89-94Article in journal (Refereed) Published
Abstract [en]

his study aims to investigate the interaction between potassium and carbonaceous matrix of soot produced from wood and herbaceous biomass pyrolysis at high heating rates at 1250°C in a drop tube reactor. The influence of soot carbon chemistry and potassium content in the original biomass on the CO2 reactivity was studied by thermogravimetric analysis. The XPS results showed that potassium incorporation with oxygen-containing surface groups in the soot matrix did not occur during high temperature pyrolysis. The potassium was mostly found as water-soluble salts such as KCl, KOH, KHCO3 and K2CO3 in herbaceous biomass soot. The low ash-containing pinewood soot was less reactive than the potassium rich herbaceous biomass soot, indicating a dominating role of potassium on the soot reactivity. However, the catalytic effect of potassium on the reactivity remained the same after a certain potassium amount was incorporated in the soot matrix during pyrolysis. Raman spectroscopy results showed that the carbon chemistry of biomass soot also affected the CO2 reactivity. The less reactive pinewood soot was more graphitic than herbaceous biomass soot samples with the disordered carbon structure.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Engineering and Technology Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-68116 (URN)10.1016/j.fuel.2018.03.140 (DOI)000432922400011 ()2-s2.0-85044460207 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-04-03 (andbra)

Available from: 2018-04-02 Created: 2018-04-02 Last updated: 2018-06-07Bibliographically approved
Trubetskaya, A., Hofmann Larsen, F., Shchukarev, A., Ståhl, K. & Umeki, K. (2018). Potassium and soot interaction in fast biomass pyrolysis at high temperatures. In: : . Paper presented at 37th International Symposium on Combustion, Dublin, Ireland, 29 July-August 3rd, 2018.
Open this publication in new window or tab >>Potassium and soot interaction in fast biomass pyrolysis at high temperatures
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2018 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Chemical Engineering Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-70172 (URN)
Conference
37th International Symposium on Combustion, Dublin, Ireland, 29 July-August 3rd, 2018
Available from: 2018-07-27 Created: 2018-07-27 Last updated: 2018-08-08Bibliographically approved
Phounglamcheik, A., Pitchot, R., Andefors, A., Norberg, N. & Umeki, K. (2018). Production of metallurgical charcoal from biomass pyrolysis: pilot-scale experiment. In: : . Paper presented at 22nd International Symposium on Analytical and Applied Pyrolysis, Kyoto, Japan, June 3-8 2018.
Open this publication in new window or tab >>Production of metallurgical charcoal from biomass pyrolysis: pilot-scale experiment
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2018 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Bioenergy Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-70427 (URN)
Conference
22nd International Symposium on Analytical and Applied Pyrolysis, Kyoto, Japan, June 3-8 2018
Available from: 2018-08-15 Created: 2018-08-15 Last updated: 2018-08-16Bibliographically approved
Toloue Farrokh, N., Suopajärvi, H., Mattila, O., Umeki, K., Phounglamcheik, A., Romar, H., . . . Fabritius, T. (2018). Slow pyrolysis of by-product lignin from wood-based ethanol production: A detailed analysis of the produced chars. Energy, 164, 112-123
Open this publication in new window or tab >>Slow pyrolysis of by-product lignin from wood-based ethanol production: A detailed analysis of the produced chars
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2018 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 164, p. 112-123Article in journal (Refereed) Published
Abstract [en]

Slow pyrolysis as a method of producing a high-quality energy carrier from lignin recovered from wood-based ethanol production has not been studied for co-firing or blast furnace (BF) applications up to now. This paper investigates fuel characteristics, grindability, moisture uptake and the flow properties of lignin chars derived from the slow pyrolysis of lignin at temperatures of 300, 500 and 650 °C (L300, L500 and L650 samples respectively) at a heating rate of 5 °C min-1. The lignin chars revealed a high mass and energy yield in the range of 39-73% and 53-89% respectively. Pyrolysis at 500 °C or higher, yielded lignin chars with low H/C and O/C ratios suitable for BF injection. Furthermore, the hydrophobicity of lignin was improved tremendously after pyrolysis. Pyrolysis at high temperatures increased the sphericity of the lignin char particles and caused some agglomeration in L650. Large and less spherical particles were found to be a reason for high permeability, compressibility and cohesion of L300 in contrast to L500 and L650. L300 and L500 chars demonstrated high combustibility with low ignition and burnout temperatures. Also, rheometric analysis showed that L500 has the best flow properties including low aeration energy and high flow function.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Biomass; Lignin; Slow pyrolysis; Combustion
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-70639 (URN)10.1016/j.energy.2018.08.161 (DOI)000448098600010 ()2-s2.0-85053151162 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-09-21 (svasva)

Available from: 2018-08-29 Created: 2018-08-29 Last updated: 2018-11-29Bibliographically approved
Trubetskaya, A., Kling, J., Broström, M., Tompsett, G., Timko, M. T., Brown, A., . . . Andersen, M. L. (2018). The effect of lignocellulosic compounds and monolignols on the soot nanostructure and CO2 reactivity. In: : . Paper presented at 37th International Symposium on Combustion, Dublin, Ireland, 29 July-3 August, 2018.
Open this publication in new window or tab >>The effect of lignocellulosic compounds and monolignols on the soot nanostructure and CO2 reactivity
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2018 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Chemical Engineering Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-70171 (URN)
Conference
37th International Symposium on Combustion, Dublin, Ireland, 29 July-3 August, 2018
Available from: 2018-07-27 Created: 2018-07-27 Last updated: 2018-08-08Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6081-5736

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