Evaluation of the thermoplastic behavior of charcoal, coal tar and coking coal blends

Fraga, Matheus Teixeira; Flores, Bruno Deves; Osório, Eduardo; Vilela, Antônio Cezar Faria

doi:10.1016/j.jmrt.2020.01.076

Cited by 18 publications

(18 citation statements)

References 12 publications

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“…Mochizuki et al and Tsubouchi et al [45,46] found that heteroatoms such as oxygen have a deleterious effect on the plastic properties of coal. From these results, the VM released from bio-coals including a high amount of oxygen is likely to inhibit the thermoplastic properties of the coal, which was discussed in [13,14]; however, the use of charcoal with a low oxygen content mainly has effects as an inert material. It was reported that the addition of inert materials to coking coal may cause a reduction in thermoplastic properties, due to the effect from the high surface area of bio-coals acting as adsorbents of the primary decomposition products of coking coal, which binds the plasticizing part of the coal, favoring the inhibition of fluidity development [47].…”

Section: Influence Of Bio-coal Carbonization On the Thermoplastic Properties Of Coking Coalmentioning

confidence: 95%

“…This material includes different raw biomasses, torrefied biomass, and pyrolyzed biomass. The addition of any type of biomass decreases the fluidity of the coal blend [10][11][12][13][14]. Ueki et al [12] reported that the addition of raw woody biomass during carbonization results in the formation of voids between coal particles during carbonization, due to the release of biomass VM, and this results in brittle bio-coke.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, Guerrero et al [10] found that the devolatilization stages of coal and charcoal overlap partially and charcoal emits VM during carbonization that can block the fluidity, by establishing cross-linked O-C bonds. Fraga et al [13] and Solar et al [14] found that the addition of charcoal to coking coal blend caused a reduction in thermoplastic properties, and more so with increasing amounts. During the coal plastic stage charcoal acts as an inert material, which does not soften and melt, and as an active material that binds the components from the plasticized coal [11].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity

El-Tawil

Björkman

Lundgren

et al. 2021

Metals

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Coke corresponds to 2/3–3/4 of the reducing agents in BF, and by the partial replacement of coking coals with 5–10% of bio-coal, the fossil CO2 emissions from the BF can be lowered by ~4–8%. Coking coal blends with 5% and 10% additions of bio-coals (pre-treated biomass) of different origins and pre-treatment degrees were carbonized at laboratory scale and with a 5% bio-coal addition at technical scale, aiming to understand the impact on the bio-coal properties (ash amount and composition, volatile matter content) and the addition of bio-coke reactivity. A thermogravimetric analyzer (TGA) connected to a quadrupole mass spectroscope monitored the residual mass and off-gases during carbonization. To explore the effect of bio-coal addition on plasticity, optical dilatometer tests were conducted for coking coal blends with 5% and 10% bio-coal addition. The plasticity was lowered with increasing bio-coal addition, but pyrolyzed biomass had a less negative effect on the plasticity compared to torrefied biomasses with a high content of oxygen. The temperature for starting the gasification of coke was in general lowered to a greater extent for bio-cokes produced from coking coal blends containing bio-coals with higher contents of catalyzing oxides. There was no significant difference in the properties of laboratory and technical scale produced coke, in terms of reactivity as measured by TGA. Bio-coke produced with 5% of high temperature torrefied pelletized biomass showed a similar coke strength as reference coke after reaction.

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Section: Influence Of Bio-coal Carbonization On the Thermoplastic Properties Of Coking Coalmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity

El-Tawil

Björkman

Lundgren

et al. 2021

Metals

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“…The properties of coke will depend on the thermoplastic properties of coal [30]. From bio-coke research it is reported that the addition of any type of biomass results in the lower fluidity of the coking coal blend, as biomass acts as inert material during softening and melting and can bind plasticized components of coal [20,[31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of bio-coal addition on fluidity during carbonization [20,[31][32][33][34][35] and coke reactivity [15][16][17][18][19][20] has been reported, but published results on the effect of washed bio-coal addition on the carbonization and bio-coke reactivity have not been found. The effects of ash composition on the reactivity of bio-coke when adding bio-coal have been reported [15][16][17][18][19], but the single effect from adding only bio-coal ash to a coking coal blend has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Influence of Modified Bio-Coals on Carbonization and Bio-Coke Reactivity

El-Tawil

Björkman

Lundgren

et al. 2021

Metals

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Substitution of coal in coking coal blend with bio-coal is a potential way to reduce fossil CO2 emissions from iron and steelmaking. The current study aims to explore possible means to counteract negative influence from bio-coal in cokemaking. Washing and kaolin coating of bio-coals were conducted to remove or bind part of the compounds in the bio-coal ash that catalyzes the gasification of coke with CO2. To further explore how the increase in coke reactivity is related to more reactive carbon in bio-coal or catalytic oxides in bio-coal ash, ash was produced from a corresponding amount of bio-coal and added to the coking coal blend for carbonization. The reaction behavior of coals and bio-coals under carbonization conditions was studied in a thermogravimetric analyzer equipped with a mass spectrometer during carbonization. The impact of the bio-coal addition on the fluidity of the coking coal blend was studied in optical dilatometer tests for coking coal blends with and without the addition of bio-coal or bio-coal ash. The result shows that the washing of bio-coal will result in lower or even negative dilatation. The washing of bio-coals containing a higher amount of catalytic components will reduce the negative effect on bio-coke reactivity, especially with acetic acid washing when the start of gasification temperature is less lowered. The addition of bio-coal coated with 5% kaolin do not significantly lower the dilatation-relative reference coking coal blend. The reactivity of bio-cokes containing bio-coal coated with kaolin-containing potassium oxide was higher in comparison to bio-coke containing the original bio-coal. The addition of ash from 5% of torrefied bio-coals has a moderate effect on lowering the start of gasification temperature, which indicates that the reactive carbon originating from bio-coal has a larger impact.

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Assessment of waste‐to‐energy potential of ELT management: An actual case study for Erzincan

Gungor

Tozlu

Arslantürk

2021

Env Prog and Sustain Energy

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End‐of‐life tires (ELTs) and their decomposition are becoming a major environmental issue in the local region as a result of economic and technological challenges. Despite this, ELT management is gaining popularity as an advanced function for treating tires to obtain char, oil, and gas products using pyrolysis. The main goal of this article is to integrate data from an actual recycling plant with the activities of pyrolysis products and their physical properties in the literature. This article presents energy potentials and basic applications of pyrolysis products as well as advances in the current situation in ELT management in the world. Accordingly, an existing ELT management in Erzincan, Turkey is explained in detail by considering the available energy recovery and material treatment activities. In this plant, which has an installed power capacity of 12 MW, approximately 25 tons of pyrolytic oil, 10.7 tons of pyrolytic gas, 24 tons of carbon black and, 10.4 tons of steel are produced daily. The calorific values of carbon black and pyrolytic oil for the products leaving the pyrolysis plant are close to the values in the literature, which is promising. In the plant, the overall thermal efficiency of the system and the engine is found to be 26.34% and 51.24%, respectively. On the other hand, to supply additional power to the plant utilizing exhaust gas discharged to the atmosphere, some thermodynamic models can be developed; additionally, more rational values can be obtained through thermoeconomic and optimization.

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Evaluation of the thermoplastic behavior of charcoal, coal tar and coking coal blends

Cited by 18 publications

References 12 publications

Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity

Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity

Influence of Modified Bio-Coals on Carbonization and Bio-Coke Reactivity

Assessment of waste‐to‐energy potential of ELT management: An actual case study for Erzincan

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