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Hermansson, Roger
Publications (10 of 33) Show all publications
Westerlund, L., Hermansson, R. & Cervantes, M. (2012). Computational fluid dynamics optimisation of a pellet burner (ed.). Paper presented at . Thermal Science, 16(4), 1275-1286
Open this publication in new window or tab >>Computational fluid dynamics optimisation of a pellet burner
2012 (English)In: Thermal Science, ISSN 0354-9836, E-ISSN 2334-7163, Vol. 16, no 4, p. 1275-1286Article in journal (Refereed) Published
Abstract [en]

Increased capacity of computers has made the computational fluid dynamics technology attractive for the design of different apparatuses. Optimisation of a pellet burner using the computational fluid dynamics was investigated in this paper. To make the design tool work fast, an approach with only mixing of gases was simulated. Other important phenomena such as chemical reactions were omitted in order to speed up the design process. The original design of the burner gave unsatisfactory performance. The optimised design achieved from simulation was validated and the results show a significant improvement. The power output increased and the emission of unburned species decreased but could be further reduced. The contact time between combustion gases and secondary air was probably too short. An increased contact time in high temperature conditions would possibly improve the design further.

National Category
Energy Engineering Fluid Mechanics and Acoustics
Research subject
Energy Engineering; Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-8402 (URN)10.2298/TSCI110609135W (DOI)000311917000020 ()2-s2.0-84874688736 (Scopus ID)6ea30390-c0f9-4f16-9fdf-be9506fe8658 (Local ID)6ea30390-c0f9-4f16-9fdf-be9506fe8658 (Archive number)6ea30390-c0f9-4f16-9fdf-be9506fe8658 (OAI)
Note
Validerad; 2012; 20121205 (cervante)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Westerlund, L., Hermansson, R. & Fagerström, J. (2012). Flue gas purification and heat recovery: a biomass fired boiler supplied with an open absorption system (ed.). Paper presented at . Applied Energy, 96, 444-450
Open this publication in new window or tab >>Flue gas purification and heat recovery: a biomass fired boiler supplied with an open absorption system
2012 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 96, p. 444-450Article in journal (Refereed) Published
Abstract [en]

A new technique for energy recovery combined with particle separation from flue gas has been tested in this project. A conventional small boiler for biofuel produces besides heat also particles to the environment through the flue gas. Decreasing the impact on the environment is desirable. Increased efficiency can be obtained if the temperature and water content of the flue gas can be further reduced. Installing an open absorption system in the heat production unit fulfils both these demands. An experimental unit has been built and tested in the last 2 years. The results show a reduction of particles in the flue gas by 33–44% compared to the ordinary system. At the same time the heat production from the unit increased by 40% when fired with wet biofuels.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-6631 (URN)10.1016/j.apenergy.2012.02.085 (DOI)000305595500045 ()2-s2.0-84861704582 (Scopus ID)4e05d055-4c41-48d4-8493-0fea5d2cd786 (Local ID)4e05d055-4c41-48d4-8493-0fea5d2cd786 (Archive number)4e05d055-4c41-48d4-8493-0fea5d2cd786 (OAI)
Note
Validerad; 2012; 20120330 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Dahl, J., Hermansson, R., Westerlund, L. & Abel, E. (2008). Värmeströmning (ed.). In: (Ed.), (Ed.), VVS 2000 Tabeller och diagram: . Paper presented at . Stockholm: Förlags AB VVS
Open this publication in new window or tab >>Värmeströmning
2008 (Swedish)In: VVS 2000 Tabeller och diagram, Stockholm: Förlags AB VVS , 2008Chapter in book (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Stockholm: Förlags AB VVS, 2008
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-20714 (URN)74cbe530-0a29-11de-9f31-000ea68e967b (Local ID)978-91-976271-1-5 (ISBN)74cbe530-0a29-11de-9f31-000ea68e967b (Archive number)74cbe530-0a29-11de-9f31-000ea68e967b (OAI)
Note
Godkänd; 2008; 20090306 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Pettersson, E., Lundgren, J. & Hermansson, R. (2006). Co-combustion of wood-shavings and horse manure in a small scale heating plant (ed.). In: (Ed.), (Ed.), Proceedings: World Bioenergy 2006 : taking you from know-how to show-how ; 30 May - 1 June 2006, Jönköping. Paper presented at World Bioenergy Conference 2006 : 30/05/2006 - 01/06/2006 (pp. 396-400). Stockholm: Swedish Bioenergy Association (SVEBIO)
Open this publication in new window or tab >>Co-combustion of wood-shavings and horse manure in a small scale heating plant
2006 (English)In: Proceedings: World Bioenergy 2006 : taking you from know-how to show-how ; 30 May - 1 June 2006, Jönköping, Stockholm: Swedish Bioenergy Association (SVEBIO) , 2006, p. 396-400Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Stockholm: Swedish Bioenergy Association (SVEBIO), 2006
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-35522 (URN)a13b0730-601a-11de-9f57-000ea68e967b (Local ID)91-631-8960-7 (ISBN)a13b0730-601a-11de-9f57-000ea68e967b (Archive number)a13b0730-601a-11de-9f57-000ea68e967b (OAI)
Conference
World Bioenergy Conference 2006 : 30/05/2006 - 01/06/2006
Note
Godkänd; 2006; 20090623 (esbpet)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Leduc, S., Fredriksson, C. & Hermansson, R. (2006). Particle-tracking option in Fluent validated by simulation of a low-pressure impactor (ed.). Advanced Powder Technology, 17(1), 99-111
Open this publication in new window or tab >>Particle-tracking option in Fluent validated by simulation of a low-pressure impactor
2006 (English)In: Advanced Powder Technology, ISSN 0921-8831, E-ISSN 1568-5527, Vol. 17, no 1, p. 99-111Article in journal (Refereed) Published
Abstract [en]

To decrease the emission of particles from a domestic wood-log boiler, particle traps based on intertial separation could be used. These could be designed and optimized with simulation tools, i.e. computational fluid dynamics (CFD) modeling. To find out whether the particle-tracking option in a commercial CFD code is reliable, a low-pressure impactor has been studied and each stage of the impactor simulated. By comparing experiments, it has been possible to determine the accuracy of the particle-tracking option for the CFD code. It has been shown that the particle-tracking procedure in the CFD software Fluent V6.0 offers good accuracy at velocities below 12 m/s with Reynolds numbers between 790 and 2150. Acceptable accuracy was shown for velocities of 20-170 m/s at Reynolds numbers between 960 and 2980. Considering actual flow velocities in a wood-log boiler and many other similar applications, the particle-tracking procedure should be accurate enough, at least for flows with a Reynolds number lower than 3000. Thus, it is recommended to use the software Fluent for simulations to find ways to reduce the particle emissions by use of mechanical traps. Three-dimensional simulations with either the Reynolds Stress Model (RSM) turbulence model, for accuracy, or the Renormalization Group (RNG) k-ε model, to save calculation time, should be used together with the stochastic particle tracking.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-12708 (URN)10.1163/156855206775123539 (DOI)000235453700006 ()2-s2.0-32944480900 (Scopus ID)bdfa39d0-b04b-11db-840a-000ea68e967b (Local ID)bdfa39d0-b04b-11db-840a-000ea68e967b (Archive number)bdfa39d0-b04b-11db-840a-000ea68e967b (OAI)
Note

Validerad; 2006; 20070130 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Lundgren, J., Hermansson, R. & Dahl, J. (2005). New furnace designed for small-scale combustion of wet and inhomogeneous biomass fuels (ed.). In: (Ed.), L. Sjunnesson (Ed.), Biomass for energy, industry and climate protection: 14th European Biomass Conference & Exhibition ; proceedings of the international conference held in Paris, France, 17 - 21 October 2005. Paper presented at European Biomass Conference & Exhibition : 17/10/2005 - 21/10/2005. Florence: ETA - Renewable Energies
Open this publication in new window or tab >>New furnace designed for small-scale combustion of wet and inhomogeneous biomass fuels
2005 (English)In: Biomass for energy, industry and climate protection: 14th European Biomass Conference & Exhibition ; proceedings of the international conference held in Paris, France, 17 - 21 October 2005 / [ed] L. Sjunnesson, Florence: ETA - Renewable Energies , 2005Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Florence: ETA - Renewable Energies, 2005
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-32613 (URN)72a37f50-477b-11dd-a00e-000ea68e967b (Local ID)88-89407-07-7 (ISBN)72a37f50-477b-11dd-a00e-000ea68e967b (Archive number)72a37f50-477b-11dd-a00e-000ea68e967b (OAI)
Conference
European Biomass Conference & Exhibition : 17/10/2005 - 21/10/2005
Note
Godkänd; 2005; 20080701 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Wang, C., Lundgren, J., Hermansson, R. & Dahl, J. (2005). Straw-fired congeneration as a possibility to provide clean energy in rural areas in China (ed.). In: (Ed.), (Ed.), Biomass for energy, industry and climate protection: 14th European Biomass Conference & Exhibition ; proceedings of the international conference held in Paris, France, 17 - 21 October 2005. Paper presented at European Biomass Conference & Exhibition : 17/10/2005 - 21/10/2005. Florence: ETA - Renewable Energies
Open this publication in new window or tab >>Straw-fired congeneration as a possibility to provide clean energy in rural areas in China
2005 (English)In: Biomass for energy, industry and climate protection: 14th European Biomass Conference & Exhibition ; proceedings of the international conference held in Paris, France, 17 - 21 October 2005, Florence: ETA - Renewable Energies , 2005Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Florence: ETA - Renewable Energies, 2005
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-32845 (URN)776d7d70-b5f9-11db-bf94-000ea68e967b (Local ID)88-89407-07-7 (ISBN)776d7d70-b5f9-11db-bf94-000ea68e967b (Archive number)776d7d70-b5f9-11db-bf94-000ea68e967b (OAI)
Conference
European Biomass Conference & Exhibition : 17/10/2005 - 21/10/2005
Note
Godkänd; 2005; Bibliografisk uppgift: CD-ROM; 20070206 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-06-05Bibliographically approved
Lundgren, J., Hermansson, R. & Dahl, J. (2004). Experimental studies during heat load fluctuations in a 500 kW wood-chips fired boiler (ed.). Paper presented at . Biomass and Bioenergy, 26(3), 255-267
Open this publication in new window or tab >>Experimental studies during heat load fluctuations in a 500 kW wood-chips fired boiler
2004 (English)In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 26, no 3, p. 255-267Article in journal (Refereed) Published
Abstract [en]

Several long-term experiments with fluctuating thermal outputs have been carried out in a newly developed biomass fuelled boiler suitable for small district heating networks. The experiments have been performed by either using the furnace only or the furnace together with a water heat store. Comparisons between these two operation strategies have been made concerning emissions and overall performance. Furthermore, the plant has been run to match a simulated heat demand during different seasons, in order to study the performance of the system during more realistic operation conditions. The results are very satisfactory concerning both performance and emissions, using any of the control strategies. Typical emissions of CO and NOx during the experiments are in the range of 10–50 mgNm−3 (5–25 mgMJ−1) and 130–175 mgNm−3 (60–90 mgMJ−1), respectively. However, during summer when the heat demand is low or zero, operational problems will occur if the heat store is excluded. Therefore, the main conclusion is that the most appropriate solution for a small district-heating system is to use a water heat store to match the heat load variations, while the furnace operates at as constant thermal output as possible.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-11819 (URN)10.1016/S0961-9534(03)00120-X (DOI)000188615900006 ()2-s2.0-0347622481 (Scopus ID)ad5a3b80-8a20-11db-8975-000ea68e967b (Local ID)ad5a3b80-8a20-11db-8975-000ea68e967b (Archive number)ad5a3b80-8a20-11db-8975-000ea68e967b (OAI)
Note
Validerad; 2004; 20060928 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Lundgren, J., Hermansson, R. & Dahl, J. (2004). Experimental studies of a biomass boiler suitable for small district heating systems (ed.). Paper presented at . Biomass and Bioenergy, 26(5), 443-453
Open this publication in new window or tab >>Experimental studies of a biomass boiler suitable for small district heating systems
2004 (English)In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 26, no 5, p. 443-453Article in journal (Refereed) Published
Abstract [en]

Extensive experiments have been carried out in a newly developed furnace suitable for small district heating networks. The fuel is wood-chips with moisture content in the range of 30-58%. One of the unique features of this new furnace is the broad thermal output span, which makes it possible to run the boiler down to 10% of maximum heat load, with maintained low emissions of CO and total hydrocarbons (THC). The aim of this study has been to evaluate the performance of the combustion chamber during steady-state operation in the complete thermal output range. The experiments show very good results over the entire thermal output range. In the range 60 kW up to 500 kW, the average CO content in the stack gases is typically below 25 mg Nm-3(20 ppm) and the NOx concentration below 195 mg Nm-3(95 ppm) during steady state conditions. At lower thermal outputs, the average CO content is below 105 mg Nm-3(84 ppm). (All values standardised to 10 vol% O 2.)

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-6369 (URN)10.1016/j.biombioe.2003.09.001 (DOI)000220330200004 ()2-s2.0-1242321988 (Scopus ID)49a117b0-bb55-11db-b560-000ea68e967b (Local ID)49a117b0-bb55-11db-b560-000ea68e967b (Archive number)49a117b0-bb55-11db-b560-000ea68e967b (OAI)
Note
Validerad; 2004; 20070112 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Lindberg, J. & Hermansson, R. (2004). Modification of reaction rate parameters for combustion of methane based on experimental investigation at furnace-like conditions (ed.). Paper presented at . Energy & Fuels, 18(5), 1482-1484
Open this publication in new window or tab >>Modification of reaction rate parameters for combustion of methane based on experimental investigation at furnace-like conditions
2004 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 18, no 5, p. 1482-1484Article in journal (Refereed) Published
Abstract [en]

A method for modifying reaction rate parameters in the Arrhenius rate equation for combustion of methane is proposed. Linear least-squares data fit to measured concentrations and temperatures is used to modify reaction rate parameters in the Arrhenius rate equation for combustion of methane in one step. The modified equation is compared to the one provided by the software Fluent by implementing both into a three-dimensional Fluent simulation. The modification of reaction rate parameters influences the result of computational fluid dynamics simulations to predict combustion at experimental conditions where the Fluent rate equation failed. With modified parameters, the size of the reaction zone increases to give better agreement with experiments than that obtained using the Fluent rate equation. This first test indicates that the method has the contingency of becoming a useful tool for modification of reaction rate parameters though it still needs further development.

National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-4862 (URN)10.1021/ef040022x (DOI)000223976800033 ()2-s2.0-4844228271 (Scopus ID)2dda0470-ac77-11db-aeba-000ea68e967b (Local ID)2dda0470-ac77-11db-aeba-000ea68e967b (Archive number)2dda0470-ac77-11db-aeba-000ea68e967b (OAI)
Note
Validerad; 2004; 20070125 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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