Ash transformation mechanism during combustion of rice husk and rice straw

Dizaji, Hossein Beidaghy; Zeng, Thomas; Hölzig, Hieronymus; Bauer, Jens; Klöss, G.; Enke, Dirk

doi:10.1016/j.fuel.2021.121768

Cited by 54 publications

(41 citation statements)

References 102 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The metallic oxides in the untreated biomass fuels result in the formation of black particles in the ashes [106]. Furthermore, the impurities increase the risk of slag formation and their role during the combustion of silica-rich biomasses have been discussed in the literature [50,107]. From Figure 5, the ashes of the untreated biomass fuels indicated the presence of black particles (fixed carbon).…”

Section: Impact Of the Pre-treatment Process On The Chemical Composition Of The Inorganic Fraction Of Biomass Fuelsmentioning

confidence: 95%

“…The effectiveness of carboxylic acid in producing high-purity amorphous silica from rice husk has been reported by Umeda et al [49]. More importantly, for high-end applications such as catalyst support, the generated biogenic silica must attain specific purity, crystallinity, and porosity [50]. So far, the use of agricultural waste products is economically and commercially successful in many applications.…”

Section: Introductionmentioning

confidence: 93%

“…In addition, Yang et al [123] reported that these metallic species accelerate the crystallization of amorphous silica above 1000 • C. Thus, eutectic mixtures or silica phases are induced, decreasing the phase transition temperature from amorphous to crystalline silica. These minerals, introduced as fuel contaminants, result in a less active amorphous silica with low textural properties [115] due to the strong correlation between the crystallinity fraction and porosity changes of the silica-rich ashes [50]. This phenomenon is even more pronounced for untreated biomass fuels, as mentioned in the study of Schneider et al [35,47] during their investigations with rice husk.…”

Section: Phase Analysis Of the Biomass Ash Samplesmentioning

confidence: 99%

“…The positions of the bands agree with the reference calcite in Figure 3 (bottom). Beidaghy Dizaji et al [50] also detected the formation of CaCO 3 in the silica-rich ashes obtained from rice husk and rice straw using a diffractometry technique (i.e., quantitative Rietveld refinement of XRD data). They reported that the formation of this phase could result from a reaction between CaO in the ash and the ambient CO and CO 2 gaseous species after the combustion.…”

Section: Ftir Analysismentioning

confidence: 99%

“…These last two phases are because of the remaining low impurities of K 2 O and CaO present in the ashes, as confirmed by the EDX spectrum of the CorH-A-1% sample in Figure 8. According to the literature, the phase formations in the ashes can be attributed to the high presence of critical ash forming elements (such as Ca, K and Na) and their interactions with the silica particles [50,[124][125][126]. Comparing the elemental compositions of the ashes of the biomass fuels leached at 1 w/v% citric acid, all ash samples except for CorC-A-1% and CorH-A-1% had a higher content of potassium and sodium oxide (see "Elemental Composition of ashes in Figure 4).…”

Section: Phase Analysis Of the Biomass Ash Samplesmentioning

confidence: 99%

See 4 more Smart Citations

Extraction and Characterization of Biogenic Silica Obtained from Selected Agro-Waste in Africa

et al. 2021

View full text Add to dashboard Cite

Increased amounts of available biomass residues from agricultural food production are present widely around the globe. These biomass residues can find essential applications as bioenergy feedstock and precursors to produce value-added materials. This study assessed the production of biogenic silica (SiO2) from different biomass residues in Africa, including cornhusk, corncob, yam peelings, cassava peelings and coconut husks. Two processes were performed to synthesize the biogenic silica. First, the biomass fuels were chemically pre-treated with 1 and 5% w/v citric acid solutions. In the second stage, combustion at 600 °C for 2 h in a muffle oven was applied. The characterization of the untreated biomasses was conducted using Inductively coupled plasma—optical emission spectrometry (ICP-OES), thermal analysis (TG-DTA) and Fourier-transform infrared spectroscopy (FTIR). The resulting ashes from the combustion step were subjected to ICP, nitrogen physisorption, Energy dispersive X-ray spectroscopy (EDX) as well as X-ray diffraction (XRD). ICP results revealed that the SiO2 content in the ashes varies between 42.2 to 81.5 wt.% db and 53.4 to 90.8 wt.% db after acidic pre-treatment with 1 and 5 w/v% acid, respectively. The relative reductions of K2O by the citric acid in yam peel was the lowest (79 wt.% db) in comparison to 92, 97, 98 and 97 wt.% db calculated for corncob, cassava peel, coconut husk and cornhusk, respectively. XRD analysis revealed dominant crystalline phases of arcanite (K2SO4), sylvite (KCl) and calcite (CaCO3) in ashes of the biomass fuels pre-treated with 1 w/v% citric acid due to potassium and calcium ions present. In comparison, the 5 w/v% citric acid pre-treatment produced amorphous, biogenic silica with specific surface areas of up to 91 m2/g and pore volumes up to 0.21 cm3/g. The examined biomass residues are common wastes from food production in Africa without competition in usage with focus application. Our studies have highlighted a significant end-value to these wastes by the extraction of high quality, amorphous silica, which can be considered in applications such as catalyst support, construction material, concrete and backing material.

show abstract

Section: Impact Of the Pre-treatment Process On The Chemical Composition Of The Inorganic Fraction Of Biomass Fuelsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 93%

Section: Phase Analysis Of the Biomass Ash Samplesmentioning

confidence: 99%

Section: Ftir Analysismentioning

confidence: 99%

Section: Phase Analysis Of the Biomass Ash Samplesmentioning

confidence: 99%

See 3 more Smart Citations

Extraction and Characterization of Biogenic Silica Obtained from Selected Agro-Waste in Africa

et al. 2021

View full text Add to dashboard Cite

show abstract

Integrated Use of Biomass to Produce Energy and Construction Material

Fiaz,

Khalid,

Akram

et al. 2024

Sewage and Biomass From Wastewater to Energy

View full text Add to dashboard Cite

Competitive Options for Bio‐Syngas in High‐Temperature Heat Demand Sectors: Projections until 2050

et al. 2022

Self Cite

View full text Add to dashboard Cite

Germany aims to accomplish climate neutrality by 2045. Thus, it is important to take actions, especially to decarbonize the industrial heat sector. In this study, competitive options for bio‐syngas as substitute for natural gas in the German industry sectors with high‐temperature heat demand were projected until 2050 by integrating selected gasification technologies into the existing BenOpt (BioENergyOPTimisation) model for energy system modeling. The results showed that the integration of heat production from selected technologies is still not competitive for large‐scale applications, but other existing biomass technologies have the potential to become competitive. Methanation can be a possible option to tailor bio‐syngas quality for specific high‐temperature industrial applications.

show abstract

Ash transformation mechanism during combustion of rice husk and rice straw

Cited by 54 publications

References 102 publications

Extraction and Characterization of Biogenic Silica Obtained from Selected Agro-Waste in Africa

Extraction and Characterization of Biogenic Silica Obtained from Selected Agro-Waste in Africa

Integrated Use of Biomass to Produce Energy and Construction Material

Competitive Options for Bio‐Syngas in High‐Temperature Heat Demand Sectors: Projections until 2050

Contact Info

Product

Resources

About