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Active fuel particles dispersion by synthetic jet in an entrained flow gasifier of biomass: Cold flow
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center.
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2016 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 302, 275-282 p.Article in journal (Refereed) Published
Abstract [en]

Pulverized fuel (PF) burners play a key role for the performance of PF fired gasification and combustion plants, by minimizing pollutant emission, fuel consumption and hence fuel costs. However, fuel diversity in power generation plants imposes limitations on the performance of existing PF burners, especially when burning solid fuel particles with poor flowability like biomass sawdust. In the present study, a vertically downward laminar flow was laden with biomass particles at different particle mass loading ratios, ranging from 0.47 to 2.67. The particle laden flow was forced by a synthetic jet actuator over a range of forcing amplitudes, 0.35–1.1 kPa. Pulverized pine particles with a sieve size range of 63–112 μm were used as biomass feedstock. Two-phase particle image velocimetry was applied to measure the velocity of the particles and air flow at the same time. The results showed that the synthetic jet had a large influence on the flow fields of both air and powdered pine particles, via a convective effect induced by vortex rings that propagate in the flow direction. The particle velocity, particle dispersion and hence inter-particle distance increased with increasing forcing amplitude. Moreover, particles accumulated within a specific region of the flow, based on their size. The effect on particle dispersion was more pronounced in the forced flows with low mass loading ratios. © 2016 Elsevier B.V.

Place, publisher, year, edition, pages
2016. Vol. 302, 275-282 p.
Keyword [en]
Biomass, Entrained flow gasifier, Flow control, Non-spherical particles, Synthetic jet, Actuators, Air, Fuel gages, Fuels, Gasification, Jets, Joints (anatomy), Laminar flow, Two phase flow, Velocity control, Velocity measurement, Vortex flow, Entrained flow gasifiers, Interparticle distances, Nonspherical particle, Particle laden flows, Particle velocities, Power generation plants, Synthetic jet actuators, Synthetic jets, Pulverized fuel
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27595DOI: 10.1016/j.powtec.2016.08.071Scopus ID: 2-s2.0-84984837775OAI: oai:DiVA.org:ri-27595DiVA: diva2:1059698
Note

References: Asadullah, M., Barriers of commercial power generation using biomass gasification gas: a review (2014) Renew. Sust. Energ. Rev., 29, pp. 201-215; Joppich, A., Salman, H., Wood powder feeding, difficulties and solutions (1999) Biomass Bioenergy, 16, pp. 191-198; Svoboda, K., Pohořelý, M., Hartman, M., Martinec, J., Pretreatment and feeding of biomass for pressurized entrained flow gasification (2009) Fuel Process. Technol., 90, pp. 629-635; Weiland, F., Hedman, H., Marklund, M., Wiinikka, H., Öhrman, O., Gebart, R., Pressurized oxygen blown entrained-flow gasification of wood powder (2013) Energy Fuel, 27, pp. 932-941; Sirignano, W.A., Advances in droplet array combustion theory and modeling (2014) Prog. Energy Combust. Sci., 42, pp. 54-86; Göktepe, B., Umeki, K., Gebart, R., Does distance among biomass particles affect soot formation in an entrained flow gasification process? (2016) Fuel Process. Technol., 141, pp. 99-105; Wicker, R.B., Eaton, J.K., Structure of a swirling, recirculating coaxial free jet and its effect on particle motion (2001) Int. J. Multiphase Flow, 27, pp. 949-970; Cerecedo, L.M., Aísa, L., García, J.A., Santolaya, J.L., Changes in a coflowing jet structure caused by acoustic forcing (2004) Exp. Fluids, 36, pp. 867-878; Balachandar, S., Eaton, J.K., Turbulent dispersed multiphase flow (2010) Annu. Rev. Fluid Mech., 42, pp. 111-133; Tamburello, D.A., Amitay, M., Active manipulation of a particle-laden jet (2008) Int. J. Multiphase Flow, 34, pp. 829-851; Mastorakos, E., Shibasaki, M., Hishida, K., Mixing enhancement in axisymmetric turbulent isothermal and buoyant jets (1996) Exp. Fluids, 20, pp. 279-290; Saber, A., Lundström, S., Hellström, G., Influence of inertial particles on turbulence characteristics in the near and Outer Wall flow as revealed with high resolution PIV (2016) J. Fluids Eng., 138, p. 091303; Serra, T., Colomer, J., Logan, B.E., Efficiency of different shear devices on flocculation (2008) Water Res., 42, pp. 1113-1121

Available from: 2016-12-22 Created: 2016-12-21 Last updated: 2016-12-22Bibliographically approved

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