Experimental Study of the Combustion Dynamics of Renewable &amp; Fossil Fuel Co-Fire in Swirling Flame

Zake, Maija; Barmina, Inesa; Krishko, V.; Gedrovičs, Mārtiņš; Desnickis, Aleksandrs

doi:10.2478/v10047-009-0024-z

Cited by 4 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For magnetic flux density, two magnetization directions, perpendicular to the flow direction and aligned with the flow direction, were considered (see Figs. 7,8). The flux density in Figs.…”

Section: Mathematical Modelling and Numerical Resultsmentioning

confidence: 97%

Effects of gradient magnetic field on swirling flame dynamics

Barmina¹,

Zake²,

Strautins³

et al. 2017

Engineering for Rural Development

View full text Add to dashboard Cite

Abstract. The recent research was focused on experimental study and mathematical modelling of the gradient magnetic field effect on the development of swirling flame dynamics to better understand the mechanism of the interaction between the swirling flames and the non-uniform magnetic field and to provide control of the main gasification/combustion characteristics at thermo-chemical conversion of biomass (wood) pellets. The experimental study of the magnetic field influence on the swirling flow dynamics and on the composition of the products was carried out, using an experimental device, which is composed of a gasifier and water-cooled sections of the combustor, downstream of which the swirling flow field develops. The upper part of the gasifier was exposed to a transverse magnetic field. The magnetic field was created by two pairs of permanent magnets, producing a non-uniform, upstream increasing magnetic field with the mean axial magnetic field gradient dB/dz ≈ 0.8-1 T·m -1 . The experimental study includes a joint research of the gradient magnetic field effect on the formation of flow velocity, flame composition and temperature profiles as well on the heat output at different stages of biomass thermo-chemical conversion providing analysis of the applicability of the gradient magnetic field for the control of biomass thermal decomposition, combustion of volatiles and heat energy production. The experimental results along with the mathematical modelling and computer simulation using different software confirm the influence of the external magnetic field on the stream, vorticity, temperature and species mass fraction fields indicating more effective burnout of volatiles and cleaner heat energy production.Keywords: swirling flame, magnetic field, biomass, combustion characteristics. IntroductionThe influence of the magnetic field on combustion has been extensively studied with the aim to control the flame stability and combustion efficiency [1][2][3]. An experimental study of the diffusion flame response to the gradient magnetic field has shown that the flame structure and length can be controlled by varying the magnetic force, which acts on paramagnetic oxygen [1][2][3] by enhancing the axial and radial mass transfer of the flame species due to the magnetic wind effect along with the enhanced fuel-air mixing and enhanced fuel burnout.The results of the experimental study and mathematical modelling have shown that, as a consequence of the magnetic field-induced Lorentz force in the flame, the magnetic field can affect the development of the swirling flame dynamics by increasing the local flow vorticity, which leads to enhanced fuel-air mixing with resulting variation of the local and average values of the flow velocity, temperature and composition [4]. Moreover, it was observed [5; 6] that the application of a gradient magnetic field to the swirling flame base when co-firing a fossil fuel (propane) with a renewable fuel (wood pellets) promoted the enhanced upstream air flow formation with the field-enhanced reve...

show abstract

Section: Mathematical Modelling and Numerical Resultsmentioning

confidence: 97%

Effects of gradient magnetic field on swirling flame dynamics

Barmina¹,

Zake²,

Strautins³

et al. 2017

Engineering for Rural Development

View full text Add to dashboard Cite

show abstract

“…The swirl effect on the flame temperature, composition of products and combustion efficiency was measured and analyzed using a Testo-350XL gas analyzer. The results of a previous experimental study into the formation of the swirling flame dynamics [11] allows suggesting that -for the given configuration of experimental setup -the secondary swirling air promotes formation of upstream and downstream swirling air flows with the swirl flow reversing from the biomass layer. To confirm the upstream swirl flow formation below the tangential nozzles, experiments were run on the influence exerted by cold air swirl effect on the propane flame.…”

Section: Methodsmentioning

confidence: 92%

“…To carry out the experimental study of the swirl effects on the formation of flow dynamics at thermo-chemical conversion of the batch-size biomass samples, the cylindrical channel combines a biomass gasifier and a combustor, downstream of which the combustion of volatiles is developing [11]. The gasifier is charged with biomass pellets of the total mass of 240g.…”

Section: Methodsmentioning

confidence: 99%

Experimental and Numerical Study of Swirling Flows and Flame Dynamics

Abricka

Barmina

Valdmanis

et al. 2014

Latvian Journal of Physics and Technical Sciences

Self Cite

View full text Add to dashboard Cite

The effect of swirling air on the flow dynamics was investigated for the cold non-reacting flows and the flame arising at thermo-chemical conversion of biomass pellets downstream of a cylindrical channel. Under experimental and numerical investigation was the swirling flow dynamics with the primary axial air supply below a biomass layer and swirling air supply above it. The results indicate that for cold flows the swirling air jet outflow from tangential nozzles leads to the formation of a complex flow dynamics which is influenced both by upstream and downstream air swirl propagation near the channel walls, with correlating swirl-enhanced formation of the upstream and downstream axial flows close to the flow centreline depending on the swirling air supply rate. These axial flows can be completely balanced at their stagnation within the axial recirculation zone. It is shown that at equal boundary conditions for the swirling flame and the cold flows the swirling flow dynamics is influenced by the upstream air swirl-enhanced mixing of the reactants below the air swirl nozzles. This determines the formation of a downstream reaction zone with correlating development of the flow velocity, temperature and composition profiles in the downstream flame regions with improved combustion stability. The low swirl intensity in these regions prevents the formation of a recirculation zone.

show abstract

“…From previous researches Zake et al 2009) it was concluded that gas and wood fuel co-firing promotes the enhanced wood fuel gasification at the primary stage of the swirling flame formation, while the additional heat injection into the flame reaction zone results with an enhanced burnout of the volatiles. There is CHP plant in Denmark, where wood chips are co-fired with natural gas.…”

Section: Introductionmentioning

confidence: 98%

Environmental Effect of Co-Firing and Magnetic Field on Wood Pellets Combustion

Suzdaļenko

Gedrovičs

2014

Journal of Environmental Engineering and Landscape Management

View full text Add to dashboard Cite

Trinitrotoluene (TNT), a commonly used explosive for military and industrial applications, can cause serious environmental pollution. 28-day laboratory pot experiment was carried out applying bioaugmentation using laboratory selected bacterial strains as inoculum, biostimulation with molasses and cabbage leaf extract, and phytoremediation using rye and blue fenugreek to study the effect of these treatments on TNT removal and changes in soil microbial community responsible for contaminant degradation. Chemical analyses revealed significant decreases in TNT concentrations, including reduction of some of the TNT to its amino derivates during the 28-day tests. The combination of bioaugmentation-biostimulation approach coupled with rye cultivation had the most profound effect on TNT degradation. Although plants enhanced the total microbial community abundance, blue fenugreek cultivation did not significantly affect the TNT degradation rate. The results from molecular analyses suggested the survival and elevation of the introduced bacterial strains throughout the experiment. Reference to this paper should be made as follows: Nõ lvak, H.; Truu, J.; Limane, B.; Truu, M.; Cepurnieks, G.; Bartkevičs, V.; Juhanson, J.; Muter, O. 2013. Microbial community changes in TNT spiked soil bioremediation trial using biostimulation, phytoremediation and bioaugmentation, Journal of Environmental Engineering and Landscape Management 21(3): 153Á162. http://dx.abstract. The aim of the recent research is to provide stable, controllable and effective wood pellets combustion with minimum emissions. Two possibilities were chosen, investigated and analysed: wood pellets co-firing with propanebutane mixture and the use of a permanent magnet. The special pilot device was constructed in the laboratory of Heat and Mass Transfer in Institute of Physics. Two types of experiments were conducted: combustion with propane-butane supply (0.9 kW up to 1.27 kW) of wood pellets with different moisture content (W = 8%, 15%, 20% and 25%); combustion of wood pellets with applied magnetic field by using the permanent magnet, an propane-butane supply also was used. The main conclusion of the research is that co-firing and magnetic field can be used as an instrument to provide more effective burnout of volatiles and cleaner heat production.

show abstract

Experimental Study of the Combustion Dynamics of Renewable & Fossil Fuel Co-Fire in Swirling Flame

Cited by 4 publications

References 3 publications

Effects of gradient magnetic field on swirling flame dynamics

Effects of gradient magnetic field on swirling flame dynamics

Experimental and Numerical Study of Swirling Flows and Flame Dynamics

Environmental Effect of Co-Firing and Magnetic Field on Wood Pellets Combustion

Contact Info

Product

Resources

About