Rice husk bubbling fluidized bed combustion for amorphous silica synthesis

Gomes, Gabriel Meneghetti Faé; Philipssen, Caterina; Bard, E. K.; Zen, Leandro Dalla; Souza, Guilherme de

doi:10.1016/j.jece.2016.03.049

Cited by 27 publications

(15 citation statements)

References 26 publications

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“…Furthermore, uncontrolled open burning of these materials produces crystalline ash with high emissions [59], which is well recognized as a lung carcinogen as well as the health risk from silicosis caused by silica deposition in the lung tissue [60,61]. To overcome these issues, researchers have been investigated feasible, economical, and environmentally friendly strategies to convert RH and RS into pure biogenic silica via combustion based on various scientific publications [53,54,[62][63][64][65][66][67][68][69][70][71][72][73] and patents [74].…”

Section: Introductionmentioning

confidence: 99%

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

et al. 2019

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Utilization of biomass either as a renewable energy source or for the generation of biogenic materials has received considerable interest during the past years. In the case of rice husk (RH) and rice straw (RS) with high silica contents in the fuel ash, these approaches can be combined to produce high-grade biogenic silica with purities >98 wt % from combustion residues. The overall process can be considered nearly neutral in terms of CO2 emission and global warming, but it can also address disposal challenges of rice husk and rice straw. For the resulting biogenic silica, several advanced application opportunities exist, e.g., as adsorbents, catalysts, drug delivery systems, etc. This article provides a comprehensive literature review on rice husk and rice straw combustion as well as applied strategies for raw material pre-treatment and/or post-treatment of resulting ashes to obtain high quality biogenic silica. Purity of up to 97.2 wt % SiO2 can be reached by combustion of untreated material. With appropriate fuel pre-treatment and ash post-treatment, biogenic silica with purity up to 99.7 wt % can be achieved. Studies were performed almost exclusively at a laboratory scale.

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Section: Introductionmentioning

confidence: 99%

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

et al. 2019

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“…Considering the used technology to carry out the gasification process, fluidized-bed reactor has been recognized as one of the most effective reactor to transform the biomass into energy [11].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the lignocellulosic winery wastes behavior during gasification process in fluidized bed: Experimental and theoretical study

Mazza

Fernandez

Saffe

et al. 2018

Journal of Environmental Chemical Engineering

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This work presents studies about the gasification of the lignocellulosic winery wastes in fluidized bed to obtain energy. Based on the exergy analysis, the exergetic improvement potential (IP) and sustainability index (SI) variations with different operational variables were analyzed. IP increases and SI decreases when moisture content, ER and SBR augment. On the other hand, both indexes present contrary behavior with the temperature increasing.Additionally, the kinetic behavior was investigated using a macro thermo-balance. The thermal decomposition of the studied biomass wastes at three heating rate, 5, 10 and 15ºC/min under steam/air mixture atmosphere show that the gasification takes place in three visible stage: water vaporization, pyrolysis and the last step associated with the reaction of the char by CO2. The distributed activation energy model method (DAEM) was used. The decomposition is not a single reaction stage, it includes the contributions of parallel reaction steps on the global reaction rate.Last, the fluidization was analyzed using air at room temperature and local atmospheric pressure.Each experiment was carried out with 100% and 75% v lignocellulosic wastes. Segregation, slugging and channelization in all studied cases. However, the addition of sand particles improves the behavior of both winery wastes.

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“…To intensify oxidation, the bubbling fluidized bed combustion was found to be an effective process [8]. The rice hull combustion was used in a 250 kW•h bubbling fluidized bed pilot plant at temperatures of 700, 750, 800 and 850 • C and with fluidization velocities of 0.3, 0.4 and 0.5 m/s.…”

Section: Discussionmentioning

confidence: 99%

Rice Hulls as a Renewable Complex Material Resource

et al. 2018

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As a result of rice grain processing, a big amount of waste (up to 20%) is produced. It is mainly rice hulls. The main components of rice hulls are cellulose, lignin and mineral ash. The mineral ash quantity in rice hulls varies from 15 up to 20%, by weight of the rice hulls. The mineral ash consists of amorphous silica (opal-type). Due to the high content of silica in rice hulls, the material burns with difficulty under natural conditions, and it is biodegradably destroyed only with difficulty, when composted. Utilization of rice hulls then becomes an ecological problem due to huge rice production and its continuous growth. At the same time, the annual quantity of silica content in rice hulls is comparable with the quantity of amorphous silica produced as a mineral resource. The issue of manufacturing cellular glass silica construction materials from rice hulls as a renewable resource is discussed in this paper. The utilization technology is based on an amorphous silicon oxide with the use of energy from the combustion of the organic component of rice hulls.

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Rice husk bubbling fluidized bed combustion for amorphous silica synthesis

Cited by 27 publications

References 26 publications

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

Prediction of the lignocellulosic winery wastes behavior during gasification process in fluidized bed: Experimental and theoretical study

Rice Hulls as a Renewable Complex Material Resource

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