Optimization of biomass fluidized bed gasification

Norway has large amounts of unutilized biomass, and it is important to process these renewable resources to products that can replace fossil fuel. Gasification of biomass is a promising technology for this purpose. Optimization of the process is crucial.


The influence of bed material, gas and particle residence time, feed rate, feed temperature, catalyst, type and size of feedstock are studied in the pilot gasifier located at USN. Online gas analyzers are used to measure the composition of the producer gas. Tar is measured with respect to quantity and quality. Temperature and pressure are measured at different positions in the gasifier. The feed rates of biomass and steam are controlled based on the temperature in the reactor.

Experimental cold flow fluidized beds are used to study the flow behavior and segregation tendency. The main cold flow model has the same dimensions as the pilot gasification reactor.

Measurements of flow behavior (bubble activity, mixing, segregation) are performed using electrical capacitance tomography (ECT), pressure sensors, flow indicators and controllers.

Additionally to the bubbling fluidized bed gasifier located at USN, a cold-flow dual fluidized bed is available at BOKU. The results of the cold flow tests and modelling will be used to validate CFD/CFPD models and to support the design of an improved reactor.

Cold-flow fluidized bed using dual-plane ECT sensors. PhotoCold-flow fluidized bed using pressur sensors. Photo

References

Cornelius Emeka Agu, Christoph Pfeifer, Marianne Eikeland, Lars-André Tokheim, Britt M.E. Moldestad, (2018), Models for Predicting Average Bubble Diameter and Volumetric Bubble Flux in Deep Fluidized Beds, Ind. Eng. Chem. Res. 2018, 57, 2658−2669

Cornelius Emeka Agu, Lars-André Tokheim, Marianne Eikeland,  Britt M.E. Moldestad, (2017), Determination of onset of bubbling and slugging in a fluidized bed using a dual-plane electrical capacitance tomography system, Chemical Engineering Journal, 2017,  328, pp 997-1008.

Janitha Chandimal Bandara, Marianne Sørflaten Eikeland and Britt Margrethe Emilie Moldestad, (2017), Analysis of the effect of steam-to-biomass ratio in fluidized bed gasification with multiphase particle-in-cell CFD Simulation, Proceedings of the 58th International Conference of Scandinavian Simulation Society, SIMS 2017, Reykjavik, Iceland

Janitha Chandimal Bandara, Marianne Sørflaten Eikeland and Britt Margrethe Emilie Moldestad, (2017),  Analyzing the effects of particle density, size, size distribution and shape for minimum fluidization velocity with Eulerian-Lagrangian CFD simulation, Proceedings of the 58th International Conference of Scandinavian Simulation Society, SIMS 2017,  Reykjavik, Iceland.

Kjell-Arne Solli .Cornelius Emeka Agu, (2017), Evaluation of drag models for CFD simulation of fluidized bed biomass gasification. Simulation, Proceedings of the 58th International Conference of Scandinavian Simulation Society, SIMS 2017, Reykjavik, Iceland.

Prasanna Welahettige, Bernt Lie, Knut Vågsæther, Britt M.E Moldestad,(2017), Study of Fluidization Regimes using OpenFOAM Computational Fluid Dynamics, Proceedings of the 58th International Conference of Scandinavian Simulation Society, SIMS 2017,  Reykjavik, Iceland

Rajan K. Thapa & Britt M. Halvorsen Thapa, (2016), Riser of Dual Fluidized Bed Gasification Reactor: Investigation of Combustion Reactions, 9th EUROSIM Congress on Modelling and Simulation, EUROSIM 2016, September 12th -16th, Oulu, Finland.

Kjell-Arne Solli, Rajan Kumar Thapa, Britt Margrethe Emilie Moldestad, (2016) Screening of kinetic rate equations for gasification simulation models, 9th EUROSIM Congress on Modelling and Simulation, EUROSIM 2016, September 12th  -16th, Oulu, Finland.

R.K. Thapa, A. Frohner, G. Tondl, C.Pfeifer & B.M. Halvorsen, (2016), Circulating fluidized bed combustion reactor: Computational Particle Fluid Dynamic model validation and gas feed position optimization. Computers & Chemical Engineering v.92 pp. 180-188.

Rajan K. Thapa, Christoph Pfeifer and Britt M. Halvorsen, (2016), Flow Regime Identification in a Fluidized Bed Combustion Reactor. International Journal of Modeling and Optimization, V 6 N.3. pp. 188-194

Cornelius E. Agu, Marianne S. Eikeland, Lars-André Tokheim and Britt M. Halvorsen, (2016) Simulation of Bubbling Fluidized Bed Using One-Dimensional Model Based on Euler-Euler Method, 9th EUROSIM Congress on Modelling and Simulation, EUROSIM 2016, September 12th  -16th, Oulu, Finland.

Janitha C. Bandara, Rajan K. Thapa, Britt M.E. Moldestad, Marianne S. Eikeland, (2016) “Simulation of Particle Segregation in Fluidized Beds, 9th EUROSIM Congress on Modelling and Simulation, EUROSIM 2016, September 12th  -16th, Oulu, Finland.

Cornelius Emeka Agu, Rajan K. Thapa,  Britt M.E. Moldestad, (2015), Simulation of Simplified Model for Kinetics of Biomass Gasification. Proceedings of the 56th International Conference of Scandinavian Simulation Society, SIMS 2017, Linköping , Sweden, Linköping Electronic Conference Proceedings 2015 (119) s. 81-89

R.K.Thapa, B.M. Halvorsen, (2014), Scaling of bubbling fluidized bed reactors with Glickman’s viscous limit set and CFD simulation, International Journal of Computational Methods and Experimental Measurements, Volume 2, Number 2, pp135-144, ISSN: 2046-0546 (print), ISSN: 2046-0554 (online)

R.K.Thapa, C. Pfeifer, B.M. Halvorsen, (2014), Modeling of reaction kinetics in fluidized bed biomass gasification reactor,  International Journal of Energy and Environment, Volume 5, Issue 1, 2014, pp. 35-44.

Thapa, Rajan Kumar; Halvorsen, Britt Margrethe, (2014), “Heat transfer optimization in a fluidized bed biomass gasification reactor”. WIT Transactions on Engineering Sciences 83, 2014.

Thapa, Rajan Kumar; Halvorsen, Britt Margrethe, (2014), Stepwise analysis of reactions and reacting flow in dual fluidized bed gasification reactor. WIT Transactions on Engineering Sciences 82, 2014,

Thapa, Rajan Kumar; Pfeifer, C; Halvorsen, Britt Margrethe, (2014), Influence of size and size distribution of biomass and bed material on performance of a dual fluidized bed gasification reactor,  CFB-11; 2014-05-14 - 2014-05-17, 2014.

K.K. Perera, R. K. Thapa & B. M. Halvorsen, (2014), Simulation and optimization of the steam gasification process using CPFD, Energy Production and Management in the 21st Century, 2, pp. 12151226, 2014.

R.K.Thapa, B.M. Halvorsen, (2013), Study of flow behavior in bubbling fluidized bed biomass gasification reactor using CFD simulation. Fluidization XIV, Engineering Conferences International (ECI); 2013-05-26 - 2013-05-30

R.K.Thapa, Christoph Pfeifer, B.M. Halvorsen, (2013), Scaling of biomass gasification reactor using CFD simulation. ICPS 13, International Conference on Polugeneration Strategies; 2013-09-03 - 2013-09-05

Kjetil Kleiva, Thapa, R.K.Thapa, B.M. Halvorsen, (2012) Study of a fluidized bed reactor for gasification of biomass. WIT Transactions on Engineering Sciences 2012 ;Volum 74. s. 241-250

R.K.Thapa, B.M. Halvorsen, (2012), Validation of the CFD model for prediction of flow behaviour in fluidized bed reactors. WIT Transactions on Engineering Sciences 2012 ;Volum 74. s. 231-239

R.K.Thapa, Christo  Rautenbach, B.M. Halvorsen, (2011), Investigation of flow behaviour in biomass gasifier using Electrical capacitance Tomography (ECT) and pressure sensors. International Conference on Polygeneration Strategies - ICPS11; 2011-08-30 - 2011-09-01