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Guilnaz, MirmoshtaghiORCID iD iconorcid.org/0000-0002-0895-8286
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Publikasjoner (10 av 10) Visa alla publikasjoner
Mirmoshtaghi, G., Li, H., Thorin, E. & Dahlquist, E. (2016). EVALUATION OF DIFFERENT BIOMASS GASIFICATION MODELING APPROACHES FOR FLUIDIZED BED GASIFIERS. Biomass and Bioenergy, 91, 69-82
Åpne denne publikasjonen i ny fane eller vindu >>EVALUATION OF DIFFERENT BIOMASS GASIFICATION MODELING APPROACHES FOR FLUIDIZED BED GASIFIERS
2016 (engelsk)Inngår i: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 91, s. 69-82Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

To develop a model for biomass gasification in fluidized bed gasifiers with high accuracy and generality that could be used under various operating conditions, the equilibrium model (EM) is chosen as a general and case-independent modeling method. However, EM lacks sufficient accuracy in predicting the content (volume fraction) of four major components (H2, CO, CO2 and CH4) in product gas. In this paper, three approaches—MODEL I, which restricts equilibrium to a specific temperature (QET method); MODEL II, which uses empirical correlations for carbon, CH4, C2H2, C2H4, C2H6 and NH3 conversion; and MODEL III, which includes kinetic and hydrodynamic equations—have been studied and compared to map the barriers and complexities involved in developing an accurate and generic model for the gasification of biomass.

This study indicates that existing empirical correlations can be further improved by considering more experimental data. The updated model features better accuracy in the prediction of product gas composition in a larger range of operating conditions. Additionally, combining the QET method with a kinetic and hydrodynamic approach results in a model that features less overall error than the original model based on a kinetic and hydrodynamic approach.

sted, utgiver, år, opplag, sider
Västerås: , 2016
HSV kategori
Identifikatorer
urn:nbn:se:mdh:diva-31591 (URN)10.1016/j.biombioe.2016.05.002 (DOI)000382524100008 ()2-s2.0-84967194662 (Scopus ID)
Tilgjengelig fra: 2016-05-15 Laget: 2016-05-15 Sist oppdatert: 2017-11-30bibliografisk kontrollert
Mirmoshtaghi, G., Skvaril, J., Campana, P. E., Li, H., Thorin, E. & Dahlquist, E. (2016). The influence of different parameters on biomass gasification in circulating fluidized bed gasifiers. Energy Conversion and Management, 126, 110-123
Åpne denne publikasjonen i ny fane eller vindu >>The influence of different parameters on biomass gasification in circulating fluidized bed gasifiers
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2016 (engelsk)Inngår i: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 126, s. 110-123Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The mechanism of biomass gasification has been studied for decades. However, for circulating fluidized bed (CFB) gasifiers, the impacts of different parameters on the gas quality and gasifiers performance have still not been fully investigated. In this paper, different CFB gasifiers have been analyzed by multivariate analysis statistical tools to identify the hidden interrelation between operating parameters and product gas quality, the most influencing input parameters and the optimum points for operation. The results show that equivalence ratio (ER), bed material, temperature, particle size and carbon content of the biomass are the input parameters influencing the output of the gasifier the most. Investigating among the input parameters with opposite impact on product gas quality, cases with optimal gas quality can result in high tar yield and low carbon conversion while low tar yield and high carbon conversion can result in product gas with low quality. However using Olivine as the bed material and setting ER value around 0.3, steam to biomass ratio to 0.7 and using biomass with 3 mm particle size and 9 wt% moisture content can result in optimal product gas with low tar yield.

HSV kategori
Identifikatorer
urn:nbn:se:mdh:diva-32432 (URN)10.1016/j.enconman.2016.07.031 (DOI)000385326400011 ()2-s2.0-84982682364 (Scopus ID)
Tilgjengelig fra: 2016-08-04 Laget: 2016-08-04 Sist oppdatert: 2018-12-18bibliografisk kontrollert
Mirmoshtaghi, G., Skvaril, J., Li, H., Thorin, E. & Dahlquist, E. (2015). INVESTIGATION OF EFFECTIVE PARAMETERS ON BIOMASS GASIFICATION IN CIRCULATING FLUIDIZED BED GASIFIERS. In: : . Paper presented at 2015 AIChE Annual Meeting, November 8-13, 2015, Salt Lake City, UT, USA.
Åpne denne publikasjonen i ny fane eller vindu >>INVESTIGATION OF EFFECTIVE PARAMETERS ON BIOMASS GASIFICATION IN CIRCULATING FLUIDIZED BED GASIFIERS
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2015 (engelsk)Konferansepaper, Oral presentation with published abstract (Fagfellevurdert)
HSV kategori
Identifikatorer
urn:nbn:se:mdh:diva-31582 (URN)978-0-8169-1094-6 (ISBN)
Konferanse
2015 AIChE Annual Meeting, November 8-13, 2015, Salt Lake City, UT, USA
Tilgjengelig fra: 2016-05-12 Laget: 2016-05-12 Sist oppdatert: 2016-12-27bibliografisk kontrollert
Mirmoshtaghi, G., Skvaril, J., Li, H., Thorin, E. & Dahlquist, E. (2015). Investigation of Most Effective Parameters on Biomass Gasufication in Circulating Fluidized bed Gasifiers. In: Forest and Plant Bioproducts Division 2015 - Core Programming Area at the 2015 AIChE Annual Meeting: . Paper presented at Forest and Plant Bioproducts Division 2015 - Core Programming Area at the 2015 AIChE Annual Meeting, 8 November 2015 through 13 November 2015 (pp. 189-200).
Åpne denne publikasjonen i ny fane eller vindu >>Investigation of Most Effective Parameters on Biomass Gasufication in Circulating Fluidized bed Gasifiers
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2015 (engelsk)Inngår i: Forest and Plant Bioproducts Division 2015 - Core Programming Area at the 2015 AIChE Annual Meeting, 2015, s. 189-200Konferansepaper, Publicerat paper (Fagfellevurdert)
HSV kategori
Identifikatorer
urn:nbn:se:mdh:diva-31795 (URN)2-s2.0-84968761506 (Scopus ID)9781510818613 (ISBN)
Konferanse
Forest and Plant Bioproducts Division 2015 - Core Programming Area at the 2015 AIChE Annual Meeting, 8 November 2015 through 13 November 2015
Tilgjengelig fra: 2016-06-09 Laget: 2016-06-09 Sist oppdatert: 2018-03-07bibliografisk kontrollert
Mirmoshtaghi, G., Li, H., Thorin, E. & Dahlquist, E. (2014). THE EFFECT OF INCLUDING HYDRODYNAMICS FOR MODELING ATMOSPHERIC BUBBLING FLUIDIZED BED GASIFIERS. In: : . Paper presented at 4th International Symposium for Gasification (I-SGA 4), 2nd Sep, 2014 - 4th Sep, 2014, Schönbrunn Palace Conference Centre, Vienna, Austria. Västerås
Åpne denne publikasjonen i ny fane eller vindu >>THE EFFECT OF INCLUDING HYDRODYNAMICS FOR MODELING ATMOSPHERIC BUBBLING FLUIDIZED BED GASIFIERS
2014 (engelsk)Konferansepaper, Oral presentation with published abstract (Fagfellevurdert)
sted, utgiver, år, opplag, sider
Västerås: , 2014
HSV kategori
Identifikatorer
urn:nbn:se:mdh:diva-31583 (URN)
Konferanse
4th International Symposium for Gasification (I-SGA 4), 2nd Sep, 2014 - 4th Sep, 2014, Schönbrunn Palace Conference Centre, Vienna, Austria
Tilgjengelig fra: 2016-05-12 Laget: 2016-05-12 Sist oppdatert: 2016-12-27bibliografisk kontrollert
Mirmoshtaghi, G., Li, H., Thorin, E. & Dahlquist, E. (2013). BIO-METHANE PRODUCTION THROUGH DIFFERENT BIOMASS GASIFIERS. In: : . Paper presented at International Conference on Applied Energy, ICAE 2013, Jul 1-4, 2013, Pretoria, South Africa.
Åpne denne publikasjonen i ny fane eller vindu >>BIO-METHANE PRODUCTION THROUGH DIFFERENT BIOMASS GASIFIERS
2013 (engelsk)Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Considering sustainability of energy resources and environmental concerns have led to activities all over the world seeking alternatives for current methods of fuel production. Gasification of biomass to supply bio-methane is one of those options. Bio-methane is carbon neutral and meets the needs of combustion engines in vehicles.Focusing on vehicle fuel production reveals the need for wide research to understand different types of gasifiers in order to find the possibilities for more methane production.In this paper data collected from different experimental setups are summarized and analyzed.Fluidized bed gasifiers show higher methane concentrations in the produced gas while entrained flow and downdraft gasifiers may be the least suitable types for high methane yields.Heating value of the product gas and cold gas efficiency are also studied as the important parameters for evaluating the characteristics of the product gas. This analysis shows that by increasing the equivalence ratio, the heating value of the product gas decreases while the efficiency may not follow the same trend.

HSV kategori
Forskningsprogram
energi- och miljöteknik
Identifikatorer
urn:nbn:se:mdh:diva-21655 (URN)
Konferanse
International Conference on Applied Energy, ICAE 2013, Jul 1-4, 2013, Pretoria, South Africa
Tilgjengelig fra: 2013-09-25 Laget: 2013-09-25 Sist oppdatert: 2018-02-26bibliografisk kontrollert
Dahlquist, E., Mirmoshtaghi, G., Larsson, E. K., Thorin, E., Yan, J., Engvall, K., . . . Lu, Q. (2013). Modelling and Simulation of Biomass Conversion Processes. In: Proceedings - 8th EUROSIM Congress on Modelling and Simulation, EUROSIM 2013: . Paper presented at 8th EUROSIM Congress on Modelling and Simulation, Cardiff 9-13 September 2013.
Åpne denne publikasjonen i ny fane eller vindu >>Modelling and Simulation of Biomass Conversion Processes
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2013 (engelsk)Inngår i: Proceedings - 8th EUROSIM Congress on Modelling and Simulation, EUROSIM 2013, 2013Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

By utilizing biomass gasification, the energy contentof the biomass can be utilized to produce gas to be used forcogeneration of heat and power as well as other energy carrierssuch as fuels for vehicles. The concept is suitable forapplication to existing CHP plants as well as for utilizing spentliqour in small scale pulp and paper mills. The introductionwould enable flexible energy utilization, use of problematicfuels as well as protects the environment by e.g. avoiding therelease of toxic substances. In this paper, the possibilities todevelop this concept is discussed. In this paper we comparedifferent gasification processes with respect to what gas qualitywe get, and how the gasification can be modelled usingdifferent modelling approaches, and how these can becombined. Results from simulations are compared toexperimental results from pilot plant operations in differentscales and with different processes like CFB and BFBTechnologies, athmospheric and pressurized, and using steam,air and oxygen as oxidizing media.

Emneord
Biomass, gasification, modelling, simulation, CHP, agricultural residue
HSV kategori
Forskningsprogram
energi- och miljöteknik
Identifikatorer
urn:nbn:se:mdh:diva-21749 (URN)10.1109/EUROSIM.2013.91 (DOI)000361021500088 ()2-s2.0-84929593503 (Scopus ID)978-076955073-2 (ISBN)
Konferanse
8th EUROSIM Congress on Modelling and Simulation, Cardiff 9-13 September 2013
Tilgjengelig fra: 2013-10-01 Laget: 2013-10-01 Sist oppdatert: 2016-10-18bibliografisk kontrollert
Mirmoshtaghi, G., Westermark, M. & Mohseni, F. (2012). Simulation of a lab-scale methanation reactor. In: Simulation of a lab-scale methanation reactor: . Paper presented at 4th International conference on Applied Energy, ICAE2012, Suzhou, Chona, Jylu 5-8, 2012.
Åpne denne publikasjonen i ny fane eller vindu >>Simulation of a lab-scale methanation reactor
2012 (engelsk)Inngår i: Simulation of a lab-scale methanation reactor, 2012Konferansepaper, Publicerat paper (Annet vitenskapelig)
Abstract [en]

Due to the worldwide effort on developing renewable fuels, methane production by different methods has gained considerable interest. Considering the difficulties in producing methane from renewable sources such as biomass or black liquor, an interesting methanation reaction for increasing methane concentration in produced gas, found to be hydrogenation of carbon dioxide and is called Sabatier reaction.The present research is on simulation and optimization of the Sabatier reaction in a catalytic bed of Ruthenium on Alumina base. The simulation is based on two different scenarios: first, an adiabatic reactor with interstage cooling and second; an isothermal tube reactor with wall coolingIn this highly exothermic reaction, most of the produced heat must be removed by external cooling in order to prevent too high increase of the bed temperature. Regarding the design optimization done in the project, the best results occur for the isothermal case in 600K and 10 bar, while for the adiabatic run an interstage cooling strategy with 5 coolers and 6 reactors has been modeled. Additionally, recycling some part of cooled product to the entrance can increase the efficiency and reduce the number of reactors for the adiabatic strategy.The conclusion to this study shows that isothermal operation with external cooling is more favorable for lab-scale studies while adiabatic interstage design with recirculation of product gas would be more feasible in full scale cases.

Key words: methanation reactor, Ruthenium catalyst, isothermal, adiabatic

HSV kategori
Identifikatorer
urn:nbn:se:mdh:diva-16473 (URN)
Konferanse
4th International conference on Applied Energy, ICAE2012, Suzhou, Chona, Jylu 5-8, 2012
Tilgjengelig fra: 2012-12-07 Laget: 2012-12-07 Sist oppdatert: 2016-01-11bibliografisk kontrollert
Han, S., Bozena, G., Guilnaz, M., Eva, T. & Yan, J. (2012). WASTE-TO-ENERGY SCENARIOS ANALYSIS BASED ON ENERGY SUPPLY AND DEMAND IN SWEDEN. In: : . Paper presented at International Conference on Applied Energy ICAE 2012, Jul 5-8, 2012, Suzhou, China.
Åpne denne publikasjonen i ny fane eller vindu >>WASTE-TO-ENERGY SCENARIOS ANALYSIS BASED ON ENERGY SUPPLY AND DEMAND IN SWEDEN
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2012 (engelsk)Konferansepaper, Oral presentation with published abstract (Annet vitenskapelig)
Abstract [en]

Energy recovery from waste treatment is of great significance for the waste management and sustainable energy supply. Sweden has proposed an ambitious vision of zero net greenhouse gases emissions by 2050, which makes most possible use of resources that the waste represents necessary. This paper is to study how the waste-to-energy (WtE) can interact with other forms of renewable energy to affect the energy supply and demand in Sweden. Based on an assumption of waste generation-treatment balance in 2050 with two cases, power preference and motor fuels preference, are investigated under diverse WtE scenarios. The results indicate that WtE production can contribute to the primary energy supply by 38 to 186 TWh, amounting to 6% to 47% of the total. The power production can be ranged from 7 to 35 TWh and motor fuels from 2 to 34 TWh through under different WtE scenarios. Furthermore, the final mitigation of CO2 emission is estimated to be from 1 to 12 Mt in 2050 compared to base year of 2010, really depending on which WtE scenario is considered.

Emneord
waste-to-energy, scenarios, energy, waste treatment.
HSV kategori
Identifikatorer
urn:nbn:se:mdh:diva-15960 (URN)
Konferanse
International Conference on Applied Energy ICAE 2012, Jul 5-8, 2012, Suzhou, China
Merknad

paper ID: A10727

Tilgjengelig fra: 2012-10-29 Laget: 2012-10-29 Sist oppdatert: 2014-12-02
Mirmoshtaghi, G.Assessment on the impact of including hydrodynamics on the performance of kinetic based models for bubbling fluidized bed gasifiers.
Åpne denne publikasjonen i ny fane eller vindu >>Assessment on the impact of including hydrodynamics on the performance of kinetic based models for bubbling fluidized bed gasifiers
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
Abstract [en]

One of the approaches to model fluidized bed gasifiers is to combine the reaction kinetics and bed hydrodynamics. The kinetic part of the model deals with the chemical reactions occurring in different steps of gasification while hydrodynamics of the bed gives more information about the physical phenomena inside the bed. In this paper two major fluidization models; two phase theory (TPT) and counter current back mixing (CCBM) and one kinetic rate model have been developed and compared in terms of accuracy in predicting product gas concentration and the generality of the model to different ranges of input parameters. The results show that including hydrodynamics of the bed as in TPT improves the accuracy of the kinetic rate model. TPT model can be used for air gasification in bubbling fluidized bed gasifiers while for steam gasification it needs further modification.

Emneord
Kinetic, hydrodynamics, biomass gasification, fluidized bed gasifiers, modeling
HSV kategori
Identifikatorer
urn:nbn:se:mdh:diva-33425 (URN)
Tilgjengelig fra: 2016-10-17 Laget: 2016-10-17 Sist oppdatert: 2017-02-02bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-0895-8286