Influence of bed height on the quality of rice husk ash in a fluidised bed combustor

Rozainee, M.; Ngo, S. P.; Salema, Arshad Adam; Johari, Anwar; Tan, K. G.

doi:10.1504/ijetm.2013.050672

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…This resulted in a lower escaped particle amount for particle diameter of 4 rather than 2.5 mm. Rozainee et al (2010) also reinforce that larger size of particles was difficult to be entrained along with fluid flow 62 . Nonetheless, the smaller particle diameter has superiority in negligible internal heat and mass transport resistance which is beneficial for rice husk combustion because of more intense contact, greater degree of conversion, and swifter combustion time 35,41 .…”

Section: Resultsmentioning

confidence: 96%

“…Rozainee et al (2010) also reinforce that larger size of particles was difficult to be entrained along with fluid flow. 62 Nonetheless, the smaller particle diameter has superiority in negligible internal heat and mass transport resistance which is beneficial for rice husk combustion because of more intense contact, greater degree of conversion, and swifter combustion time. 35,41 The variation of air supply ratio also does not give any pattern because the lower secondary air ratio from 30% to 15% reduces the escaped particle amount for particle diameters of 2.5 and 4 mm but not for 1 mm.…”

Section: Model Validation and Grid Independence Test Resultsmentioning

confidence: 99%

“…At first, the escaped particle amount weakens from "0-100" to "50-50" and the value goes up drastically from "50-50" to "100-0," both for temperatures 25 C and 700 C. This leads to the more escaped particle amount in the furnace containing rice husk ash compared to rice husk because ash is more brittle and easier to break into smaller fragments, 66,67 making them more easily entrained. 62,64 It can be said that the lowest escaped particle amount is found at the composition of "50-50." This is supported by the calculation results from Equations 8a and 9 where the largest particle settling velocity is nominated to "50-50.…”

Section: Influences Of Feed Characteristic Properties and Process Tem...mentioning

confidence: 99%

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Digitalized turbulent behaviors of air and rice husk flow in a vertical suspension furnace from computational fluid dynamics simulation

Steven

Restiawaty

Pasymi

et al. 2022

Asia-Pacific J Chem Eng

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The knowledge of fluid–particle flow behavior is necessary. Unfortunately, computational fluid dynamics (CFD) studies are mostly focused on developing numerical methods in detail. Instead, the CFD studies should also subtly shift to become a tool for digitalizing fluid science to guide the practical industrial aspects. Therefore, this simulation study intends to reveal the air and rice husk flow behaviors in a vertical suspension furnace, complete with presenting digital simulation data, aiming to alleviate the escape particle amount. According to this study, the escaped particle amount was suppressed under more sphere particle, smaller particle size, and feed inlet pipe that sunk into the burner. The properties change from rice husk to ash, along with temperature escalation (as in combustion phenomena), enlarging the escaped particle amount, so the cyclone should be installed to handle it. In addition, the results of digital turbulent data from CFD simulation have succeeded in intriguing and revealing the fluid–particle flow behavior in the vertical suspension furnace. The data show a close match to the real phenomena occurring inside this furnace which reflects the standard k–ε model can conclusively predict fluid–particle flow behavior without conflicting Newton's second law of particle motion.

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Section: Resultsmentioning

confidence: 96%

Section: Model Validation and Grid Independence Test Resultsmentioning

confidence: 99%

Section: Influences Of Feed Characteristic Properties and Process Tem...mentioning

confidence: 99%

See 1 more Smart Citation

Digitalized turbulent behaviors of air and rice husk flow in a vertical suspension furnace from computational fluid dynamics simulation

Steven

Restiawaty

Pasymi

et al. 2022

Asia-Pacific J Chem Eng

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“…The thermochemical route for the production of biosilica from RH involves calcining or burning the RH to produce RH ash, containing biosilica. The most common thermochemical route is the calcination and fixed-bed combustion of RH [54,55]; however, pyrolysis of RH [56,57] and fluidized-bed combustion of RH [58,59] are other popular approaches in this route. Notably, the calcination of RH in the absence of air turns the RH into RH ash, but a high calcination temperature can create crystalline biosilica in the RH ash [60].…”

Section: Thermochemical Route For the Production Of Biosilica From Rhmentioning

confidence: 99%

Valorization of lignocellulosic rice husk producing biosilica and biofuels—a review

et al. 2022

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Lignocellulosic biomass is an agricultural waste material abundantly produced in large quantities on earth. Rice husk (RH) is one of the lignocellulosic biomass and a huge byproduct of rice milling. Notably, the rice plant collects silica from the soil and stores the collected silica in the form of silicic acid inside the cellulose micro-compartments of the plant. Therefore, RH obtained from rice milling contains a significant quantity of amorphous silica, which can further be used for several other purposes. Furthermore, Silica-rich RH can be employed as raw material for the production of biofuels and biochars instantaneously via thermochemical processes like pyrolysis, gasification. This article thoroughly explored the prospective method of rice husk use to produce bio silica and energy at the same time, which is currently under investigation. Moreover, this study also discussed current improvements in the synthesis of RH silica materials and their long-term uses, particularly in energy and environmental functional materials. In terms of the environment, RH-silica materials may remove heavy metals and organic pollutants in soil amendment, wastewater treatment, and gas purification via adsorption, catalysis, and integrative methods. In essence, there are numerous research and development obstacles to the production of bio silica and biofuels, respectively, from RH to overcome, and this review article highlights all of them.

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“…Rumus pada Tabel 1 digunakan untuk perhitungan dimensi reaktor. Rumus molekul sekam padi tiap 1 atom karbon adalah CH 1.63 O 0.75 yang diambil dari ratarata dari 6 literatur berbeda, yaitu Raveendran et Ramirez et al (2007), Janvijitsakul dan Kuprianov (2007), Wannapeera et al (2008), IRRI (2009), dan Rozainee et al (2010) . Total seluruh skenario yang akan disimulasikan adalah 6 skenario.…”

Section: Perhitungan Dimensi Reaktorunclassified

Computational Fluid Dynamics Analysis for Designing Downdraft-Rice Husk Gasifier

Dzulfansyah¹,

Nelwan²,

Wulandani³

2014

JTEP

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Influence of bed height on the quality of rice husk ash in a fluidised bed combustor

Cited by 5 publications

References 15 publications

Digitalized turbulent behaviors of air and rice husk flow in a vertical suspension furnace from computational fluid dynamics simulation

Digitalized turbulent behaviors of air and rice husk flow in a vertical suspension furnace from computational fluid dynamics simulation

Valorization of lignocellulosic rice husk producing biosilica and biofuels—a review

Computational Fluid Dynamics Analysis for Designing Downdraft-Rice Husk Gasifier

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