Analysis of tars formed during co-pyrolysis of coal and biomass at high temperature in carbon dioxide atmosphere

Tchapda, Aime H.; Krishnamoorthy, Vijayaragavan; Yeboah, Yaw D.; Pisupati, Sarma V.

doi:10.1016/j.jaap.2017.09.011

Cited by 32 publications

(17 citation statements)

References 45 publications

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“…Vitrinite content is known to increase fluidity at higher pressures. The fluid (tar) tends to contain highly aromatic compounds which gets converted to soot due to polymerization reactions [34,35]. Table 3 and Figure 6B-E show the thermal swelling ratio, morphology, surface area, and pore size distribution of chars for <1.3, 1.3-1.6, and >1.6 g/cc fractions.…”

Section: Effect Of Feed Particle Densitymentioning

confidence: 99%

Effect of Temperature, Pressure, Feed Particle Size, and Feed Particle Density on Structural Characteristics and Reactivity of Chars Generated during Gasification of Pittsburgh No.8 Coal in a High-Pressure, High-Temperature Flow Reactor

Krishnamoorthy

Pisupati

2019

Energies

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The gasification behavior of coal under high-temperature and high-pressure conditions is important from the perspective of designing and optimizing high efficiency gasifiers and troubleshooting existing gasifiers. The effect of feed particle size, density, temperature, and pressure on char porous structure, morphology, reflectance, and reactivity under conditions relevant to entrained-flow gasification was investigated. The chars were generated over a range of temperatures (1100, 1300, and 1400 °C at 11.3 bar for the −150 + 106 µm fraction), pressures (3.4, 6.2, 11.3, 15.5, and 21.7 bar at 1300 °C for the −150 + 106 µm fraction), for various size fractions (−106 + 75, −150 + 106, −212 + 150, −420 + 212 µm at 1300 °C and 11.3 bar), and density fractions (<1.3, 1.3–1.6, >1.6g/cc for the −106 + 75 µm at 1300 °C and 11.3 bar) of Pittsburgh No.8 bituminous coal using a high-pressure, high-temperature flow reactor (HPHTFR) in a equimolar mixture of CO2 and N2. Chars were characterized for conversion, morphology, thermal swelling ratio, and reactivity using ash tracer technique, oil immersion microscopy, tap density technique, and a thermogravimetric analyzer, respectively, and the results were statistically analyzed to determine for effects by feed particle density, feed particle size, temperature, and pressure. The results showed that the conversion was most affected by temperature, followed by feed particle size, pressure, and feed particle density. In the case of structural characteristics (i.e., thermal swelling ratio and group-I char concentration), feed particle density affected group-I concentration, while both feed particle size and feed particle density affected thermal swelling ratio. Variation in vitrinite content and fragmentation affected the thermal swelling ratio and group-I char concentration. In the case of intrinsic reactivity, particle density showed the largest effect, followed by temperature, particle size, and pressure. An increase in reflectance and temperature was found to inversely affect intrinsic reactivity.

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Section: Effect Of Feed Particle Densitymentioning

confidence: 99%

Effect of Temperature, Pressure, Feed Particle Size, and Feed Particle Density on Structural Characteristics and Reactivity of Chars Generated during Gasification of Pittsburgh No.8 Coal in a High-Pressure, High-Temperature Flow Reactor

Krishnamoorthy

Pisupati

2019

Energies

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“…The weight of tar dissolved in butyl acetate was estimated by gravimetric analysis, as proposed by Tchapda. 8 The gas yield was obtained by the difference. Furthermore, the high temperature pyrolysis and tar collection experiments were repeated three times in this work.…”

Section: Sample Preparationmentioning

confidence: 99%

“…[1][2][3][4] Tar is a complex mixture of condensable hydrocarbons comprising single-ring to 5-ring aromatic compounds plus other oxygen-containing hydrocarbons and complex polyaromatic hydrocarbons (PAHs). [5][6][7][8] It should be noted that tar is different from bio-oil, which is also the pyrolysis product of biomass or biomass-coal blends and is usually dened as a dark brown, free-owing organic liquid comprising highly oxygenated compounds, because they have different components and source conditions. 9,10 Thus, there is no need to distinguish tar and bio-oil during pyrolysis at high temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Aromatic hydrocarbons show the highest concentration in biomass-coal tar with low percentages of biomass, while aliphatic and oxygenated hydrocarbons have the highest concentrations when the biomass addition is high. 8 However, due to the complicated composition of tar and complex variations in the local composition of tar during pyrolysis processes, distinguishing tar components in a reasonable way is still an important topic. In contrast to previous work, this work divides tar components into four large categories containing several smaller categories to analyze the changes in tar components at different biomass addition levels in detail.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 Biomass tar is produced from cellulose, hemicellulose, and lignin during high temperature pyrolysis; [18][19][20] its primary components, oxygenated compounds, mainly form at 400 C to 600 C. 5 Further, some monocyclic aromatic compounds as well as less aromatic PAHs are produced at higher temperatures (600 C to 1000 C). 8,21,22 Recent studies have paid more attention to the effects of biomass on biomass-coal tar at high temperature. The organic components in the biomass (cotton stalk) have a positive inuence on the alkene formation of tar during high temperature co-pyrolysis (600 C).…”

Section: Introductionmentioning

confidence: 99%

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Effects of poplar addition on tar formation during the co-pyrolysis of fat coal and poplar at high temperature

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Performance Optimization and Efficient Application of Highly Reactive Iron Coke: Research Progress and Future Trend

Wang

Bao

et al. 2023

steel research int.

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Iron coke has emerged as a promising raw material for low‐carbon ironmaking. However, the structure and properties of iron coke are still obstacles to practical application in blast furnaces, especially the strength of iron coke. Herein, investigations on the preparation and properties of iron coke are reviewed and an integrated system for the performance optimization and efficient utilization of iron coke is proposed. First, the characteristics of different preparation processes for iron coke are compared; then the advantages and limitations of the three processes are summarized. Afterward, the evolution mechanism of iron coke strength and the catalytic mechanism of Fe on the gasification reaction of iron coke are explored in depth. In addition, the coupling mechanism of iron coke gasification and iron ore reduction is analyzed and discussed. The influence of iron coke on the melting–dropping properties of blast furnace charge and the mathematical simulation of using iron coke in the blast furnace are analyzed and summarized. Finally, a comprehensive strategy for the performance optimization of iron coke and its efficient application in the blast furnace is proposed, in which the sequence slicing 3D reconstruction method is applied to analyze the relationship between microstructure and performance of iron coke.

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Analysis of tars formed during co-pyrolysis of coal and biomass at high temperature in carbon dioxide atmosphere

Cited by 32 publications

References 45 publications

Effect of Temperature, Pressure, Feed Particle Size, and Feed Particle Density on Structural Characteristics and Reactivity of Chars Generated during Gasification of Pittsburgh No.8 Coal in a High-Pressure, High-Temperature Flow Reactor

Effect of Temperature, Pressure, Feed Particle Size, and Feed Particle Density on Structural Characteristics and Reactivity of Chars Generated during Gasification of Pittsburgh No.8 Coal in a High-Pressure, High-Temperature Flow Reactor

Effects of poplar addition on tar formation during the co-pyrolysis of fat coal and poplar at high temperature

Performance Optimization and Efficient Application of Highly Reactive Iron Coke: Research Progress and Future Trend

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