Combustion Science and Engineering

Annamalai, K.; Puri, Ishwar K.

doi:10.1201/9781420003789

Cited by 75 publications

(48 citation statements)

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“…As the radius ratio (r/a) increased, the temperature around the particle decreased. Normally, an entrained bed gasifier uses smaller particles (< 100 µm) where gas phase flame is likely and radiation losses are insignificant . A fixed bed gasifier uses large particles (> 1000 µm) where radiation losses are significant for each particle .…”

Section: Resultsmentioning

confidence: 99%

“…For coals ranging from low‐rank lignite to high‐rank anthracite, fixed carbon ranges from about 50–95 % on a dry ash free (DAF) mass basis. Volatile matter burns with a time scale of 10 ms, while fixed carbon burns with a time scale of 250 ms for a particle of 75 µm in size . Thus, the combustion timescale is dominated by the combustion of char particles, ignoring the effect of the ash and the porous structure during the combustion.…”

Section: Introductionmentioning

confidence: 99%

“…Even though the ultimate goal of the gasifiers operating under global rich conditions is to produce CO and H 2 , there are particles with enough O 2 (near O 2 injection ports) to form diffusion flames, which can lead to ash fouling problems during the hotter phase of combustion (char combustion) in non‐slagging gasifiers. The typical heterogeneous reactions that can occur by transfer of oxygen to carbon from O 2 are:…”

Section: Introductionmentioning

confidence: 99%

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Combustion of pure carbon in the presence of H₂O and CO₂ using single and double film models

2018

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In integrated gasification combined cycles systems, it is of interest to estimate the burn or gasification rate ( _ m), particle surface/wall temperature (T w ), and flame temperature (T f ), and also control of the T w and T f with free stream CO 2 and the H 2 O level, which promote endothermic reactions. In the past, char combustion in the air was modelled using either a conventional single film model (SFM), or a conventional double film model (DFM). In this study, modified SFM and DFM models, including both heterogeneous reactions of CO 2 and H 2 O with C, and gas phase oxidation of both CO and H 2 , were developed. The SFM and DFM were switched to SFM-DR (single film model with double reactions) and DFM-DR (double film model with double reactions). The SFM-DR assumes that the gas phase is frozen, with the final products being CO and H 2 , and the transfer numbervH 2 O;IV ; DFM-DR includes gas phase oxidation of both CO and H 2 with O 2 , with the final products being CO 2 and H 2 O and the same modified transfer number B under infinitely fast chemistry. Finally, six different char combustion cases with or without H 2 O and CO 2 in the free stream were simulated to obtain the flame profile for modified SFM-DR and DFM-DR. It was found that reasonable flame profiles of char combustion were obtained for both SFD-DR and DFM-DR. Moreover, the O 2 -rich combustion could promote the endothermic Boudouard and steam-carbon reactions. Finally, the burning rate (kg/m 2 Á s) decreased with the increase of particle diameter for both SFM-DR and DFM-DR.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combustion of pure carbon in the presence of H₂O and CO₂ using single and double film models

2018

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“…(FC) and volatile matter (VM) [25]. In these experiments, the juniper and mesquite wood chips with moisture content from 6% to 24% were used for the gasification studies.…”

Section: Proximate and Ultimate Analysis Of The Mesquite And Juniper mentioning

confidence: 99%

“…Once the steady state condition was achieved the gas analysis was started and the temperature was also recorded for 8-10 min. Preliminary studies indicated that if the ER was set to a [25] Mesquite and juniper fuels can be converted into useful energy W. Chen et al…”

Section: Experimental Facilitymentioning

confidence: 99%

Liquid yield from juniper and mesquite bio-fuel gasification

Chen

Thanapal

Annamalai

et al. 2015

Int. J. Energy Res.

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SUMMARYMesquite (Prosopis glandulosa) and redberry juniper (Juniperus pinchotii) are two woody species which dominate uncultivated lands in the south central Great Plains, USA (Texas, Oklahoma) and may have potential for bioenergy utilization. In this study, these two biomasses were gasified in an adiabatic, updraft fixed-bed gasifier using air as medium. The products include low heating value gas and liquid tar yield. The effects of fuel moisture content and the equivalence ratio (ER) on liquid yields including heavy tar and light tar and higher heating value (HHV) of the producer gas were investigated. It was found that updraft gasifiers produce a large amount of tar, in a range of 100 g/Nm 3 of gas produced. As the equivalence ratio (ER) increased (i.e. more rich char conditions), peak temperature (T peak ) within the bed decreased due to the lesser partial oxidization. The liquid yield showed peak value with change in moisture content between 6 and 24%. Heavy tar is a very high quality fuel with a higher heating value of over 29 MJ/kg on a dry, ash-free (DAF) basis which is a slightly higher than that of ethanol.

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Combustion Science and Engineering

Cited by 75 publications

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Combustion of pure carbon in the presence of H₂O and CO₂ using single and double film models

Combustion of pure carbon in the presence of H₂O and CO₂ using single and double film models

Liquid yield from juniper and mesquite bio-fuel gasification

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Combustion Science and Engineering

Cited by 75 publications

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Combustion of pure carbon in the presence of H2O and CO2 using single and double film models

Combustion of pure carbon in the presence of H2O and CO2 using single and double film models

Liquid yield from juniper and mesquite bio-fuel gasification

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Combustion of pure carbon in the presence of H₂O and CO₂ using single and double film models

Combustion of pure carbon in the presence of H₂O and CO₂ using single and double film models