Effect of temperature on the enrichment and volatility of 18 elements during pyrolysis of biomass, coal, and tires

Raclavská, Helena; Corsaro, Agnieszka; Juchelková, Dagmar; Sassmanová, Veronika; Frantík, Jaroslav

doi:10.1016/j.fuproc.2014.12.001

Cited by 34 publications

(14 citation statements)

References 34 publications

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“…For nitrogen (N) and phosphorus (P), even a small proportion of N finally transforms into NOx and releasing to the environment (no P in gas) during pyrolysis, most of the N (45-60%) and P (above 70%) end up in biochar after undergoing a series of thermochemical reactions (Liu et al 2011). Generally, a relatively low pyrolysis temperature was found to be favorable for the enrichment of N and P in biochar (Cantrell et al 2012;Raclavska et al 2015). N and P species in biochar include various organic and inorganic species.…”

Section: Elemental Compositionmentioning

confidence: 99%

Application of biochar-based materials in environmental remediation: from multi-level structures to specific devices

Wang

et al. 2020

Biochar

125

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The development of biochar has triggered a hot-spot in various research fields including agriculture, energy, environment, and materials. Biochar-based materials provide a novel approach against environmental challenging issues. Considering the rapid development of biochar materials, this review serves as a valuable platform to summarize the recent progress on the theoretical investigation and engineering applications of biochar materials in environmental remediation. For a better understanding of the structure-application relationships, the structural properties of biochar from macroscopic and microscopic aspects are summarized. The multilevel structures including elements, phases, surface chemistry, and molecular are highlighted to elucidate the multi-functional properties of biochars. Sorption, catalysis, redox reaction, and biological activity of biochar are briefly illustrated, which influence the transport, transformation, and removal of organic and inorganic pollutants in the environments. According to the multi-level structures and structure-application relationships of biochar, specific biocharbased materials and devices have been designed for practical environmental application. The important progress on the functionalization and device of biochar-based materials, including magnetic biochars, 2D and 3D biochar-based macrostructures, immobilized microorganism on biochar, and biochar-amended biofilters are highlighted. The environmental friendliness and sustainability of biochar-based materials, considering the whole cycle from synthesis to application, are evaluated.

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Section: Elemental Compositionmentioning

confidence: 99%

Application of biochar-based materials in environmental remediation: from multi-level structures to specific devices

Wang

et al. 2020

Biochar

125

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“…In coal, prevailing sulfidic Pb association facilitates its volatilization during the combustion [83], even at lower combustion temperatures (e.g., during fluidized-bed combustion). Moreover, some waste materials co-combusted with coal might contain Pb concentrations comparable or even higher than those in coal, such as tires (20 ppm) [84], pickling sludge (33 ppm) [85], or waste-activated sludge from municipal wastewater treatment (138 ppm) [86]. Then, the creation of condensed species would be propitious for its retention in bottom ash or fly ash (preventing passing through the particulate control device in gaseous form).…”

Section: Discussionmentioning

confidence: 99%

Behavior of Pb During Coal Combustion: An Overview

et al. 2019

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Despite the progress in understanding heavy metals behavior during coal combustion, mitigation of heavy metals emissions is still a tough challenge due to a complex character of this phenomenon. Several lists of potentially toxic elements have been presented; in most cases, Pb belongs to the elements with the greatest environmental and human-health concern. The review paper is focused upon the behavior of Pb during coal combustion. with particular attention paid to decreasing its emissions. It summarizes the dominant parameters affecting its redistribution among coal combustion streams. As gaseous emissions can quite easily pass through the particulate control device, attention was paid primarily to Pb distribution between condensed and volatilized phases. A crucial factor enhancing Pb volatility is the presence of organic or inorganic chlorides, which is discussed in detail, including their chlorination mechanisms and interactions with other fuel/flue gas species. Components decreasing Pb volatility and promoting the formation of condensed phases are also discussed (higher levels of moisture, Na, O2 etc.). Factors enhancing Pb volatility, as well as factors facilitating Pb retention, are discussed with the view of fluidized-bed combustion, pulverized-fuel combustion, or co-combustion of coal with wastes.

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“…The increase of CO 2 content should be caused by the decrease of H 2 , thus explaining why they correspond to each other so exactly. In addition, as shown in Table 1, the catalytic substances in HKN are mainly potassium and calcium, which could release at temperatures higher than 500 • C [31][32][33] to catalyze the decomposition of WS particles P WS . The gas products of 50 wt.% samples at different positions are illustrated in Figure 5e,f.…”

Section: ) Gas Composition From Co-pyrolysis Of Hkn and Wsmentioning

confidence: 99%

Effects of Contact Conditions between Particles and Volatiles during Co-Pyrolysis of Brown Coal and Wheat Straw in a Thermogravimetric Analyzer and Fixed-Bed Reactor

Zhou

Zhang

et al. 2019

Processes

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Biomass is a clean and renewable energy source. In order to partially replace fossil fuels and break the limitations of the usage of biomass alone, co-pyrolysis of coal and biomass has been increasingly focused on by researchers, but few articles have investigated the effects of contact conditions between volatiles produced by thermal decomposition and particles from each other during co-pyrolysis. In the present work, co-pyrolysis behavior of wheat straw (WS) and brown coal (HKN) was investigated in a thermogravimetric analyzer (TGA) up to 1100 °C and a fixed bed reactor up to 800 °C, with different contact conditions of particles (biomass was placed above, below and well-mixed with coal). The results showed that the most obvious interactions occurred for mixed sample when 10 wt.% biomass was placed below the coal and mixed sample when 50 wt.% biomass was placed above the coal, both in TGA and fixed bed reactor, with different mechanisms. The synergy effect related to interactions that occurred during co-pyrolysis lead to different behaviors compared to simply addition of coal and biomass: In TGA this was caused by longer reaction time between particles and volatile products produced in primary pyrolysis process. However, for the fixed bed reactor, much more volatiles and catalytic compounds were produced to promote the particles decomposition of WS and HKN. Therefore, opposite to TGA, obvious synergy effects occurred for the blend with less contact time and were caused by volatiles containing more H2 and catalytic materials, which reacted with particles of the other fuel species along the gas flow direction. The kinetic parameters obtained by the Coats–Redfern method agreed with experimental behaviors and synergy effects.

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Effect of temperature on the enrichment and volatility of 18 elements during pyrolysis of biomass, coal, and tires

Cited by 34 publications

References 34 publications

Application of biochar-based materials in environmental remediation: from multi-level structures to specific devices

Application of biochar-based materials in environmental remediation: from multi-level structures to specific devices

Behavior of Pb During Coal Combustion: An Overview

Effects of Contact Conditions between Particles and Volatiles during Co-Pyrolysis of Brown Coal and Wheat Straw in a Thermogravimetric Analyzer and Fixed-Bed Reactor

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