Low temperature entrained flow pyrolysis and gasification of a Victorian brown coal

Tanner, Joanne; Kabir, Kazi Bayzid; Müller, Michael; Bhattacharya, Sankar

doi:10.1016/j.fuel.2015.03.069

Cited by 37 publications

(28 citation statements)

References 18 publications

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“…The influence of pyrolysis temperature, gasification temperature, and gasification atmosphere on fuel conversion, solid and gaseous product yields, sulphurous and nitrogenous syngas contaminants, and solid residue characteristics are reported. This study comprehensively demonstrates the capabilities of the apparatus, continues the previous low temperature study, 5 and provides useful new data with respect to future modeling applications.…”

Section: Introductionsupporting

confidence: 68%

“…A corresponding decrease in CO 2 , CH 4, and C 2 H 6 is also apparent. Data for MOR at 800, 900, and 10008C is taken from previous work, 5 in which chars were prepared from the same coal in a lower temperature EFR. The gas yield trends may be attributed to a combination of increased decomposition of functional groups and char structural components, 16 and partial gasification of the nascent char.…”

Section: Effect Of Pyrolysis Temperaturementioning

confidence: 99%

“…Chars produced at low temperature result in lower microporous surface area, 5 and correspondingly lower available active sites for gasification. 8 The steam gasification and Boudouard reactions are chemical rate limited, and therefore relatively slow under entrained flow conditions at temperatures below 10008C.…”

Section: Effect Of Pyrolysis Temperaturementioning

confidence: 99%

“…8 The steam gasification and Boudouard reactions are chemical rate limited, and therefore relatively slow under entrained flow conditions at temperatures below 10008C. 5 As pyrolysis temperature increases, a balance is reached between a sufficiently porous char structure for high reactivity and a relatively slow consumption of char by in situ gasification with pyrolysis product gases. Further increases in pyrolysis temperature under entrained flow conditions induce char restructuring, annealing and partial gasification, resulting in progressively deactivated residual char.…”

Section: Effect Of Pyrolysis Temperaturementioning

confidence: 99%

“…A low temperature (< 10008C) entrained flow pyrolysis and gasification study showed that entrained flow processing of Victorian brown coal is feasible, but failed to achieve the expected high conversion and low contaminant rates at the temperature and residence time conditions of the investigation. 5 The devolatilisation and gasification reactivity of Rhenish lignite at 900 and 11008C has been reported. 6,7 Higher pyrolysis temperature resulted in a decrease in surface area and an equivalent or increased activation energy for the char-CO 2 and char-steam reactions, implying that increased pyrolysis temperature does not necessarily produce a more reactive char.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

High‐temperature pyrolysis and CO₂ gasification of Victorian brown coal and Rhenish lignite in an entrained flow reactor

Tanner

Bhattacharya

Bläsing³

et al. 2016

AIChE Journal

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The low rank coals from Victoria, Australia, and Rhineland, Germany are of interest for use in entrained flow gasification applications. Therefore, a high temperature, electrically heated, entrained flow apparatus has been designed to address the shortage of fundamental data. A Victorian brown coal and a Rhenish lignite were subjected to rapid, entrained flow pyrolysis between 1100 and 14008C to generate high surface area chars, which were subsequently gasified at the same temperatures under CO 2 in N 2 between 10 and 80 vol %. The Victorian coal was more reactive than the Rhenish coal, and peak char reactivity was observed at 12008C. Char conversion and syngas yield increased with increasing temperature and plateaued at high CO 2 concentration. Ammonia and tar species were negligible and HCN and H 2 S were present in parts per million (volume) concentrations in the cooled, filtered syngas.

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Section: Introductionsupporting

confidence: 68%

Section: Effect Of Pyrolysis Temperaturementioning

confidence: 99%

Section: Effect Of Pyrolysis Temperaturementioning

confidence: 99%

Section: Effect Of Pyrolysis Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High‐temperature pyrolysis and CO₂ gasification of Victorian brown coal and Rhenish lignite in an entrained flow reactor

Tanner

Bhattacharya

Bläsing³

et al. 2016

AIChE Journal

Self Cite

View full text Add to dashboard Cite

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Effect of pyrolysis conditions on the improvement of the physicochemical structure of activated carbon obtained from Jixi bituminous coal

Liu

Jia

et al. 2019

Asia-Pacific J Chem Eng

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Different pyrolysis conditions have been confirmed as a useful way to improve the physicochemical structure of Jixi bituminous char to obtain fully developed porosity after a low burn-off during activation. In this paper, a series of coalchar samples were prepared at different pyrolysis temperatures, rates, and residence times. The effect of the pyrolysis temperature on the physicochemical structure in coal char is important because it can control the breakage and recombination of different types of chemical bonds. The impact of the pyrolysis rate gradually increases with increasing temperature, indicating that its influence is closely related to the pyrolysis temperature. However, an extension of the residence time at different pyrolysis temperatures and rates can only help the evolution of the chemical structure. It was determined that the typical char (KJX800-40) produced by rapid pyrolysis at 800°C over a long residence time (40 min) is the most suitable for subsequent activation due to its disordered carbon structure, abundant initial pores, and active sites. The initial pores that developed in the KJX800-40 char facilitate the diffusion of activated gas to avoid serious carbon losses on the surface of the particles; alternatively, more active sites help the etching of the carbon structure to promote the rapid and continuous development of the micropores, following nonhierarchical development. On the basis of these results, a pyrolysis condition with a high S BET (859.14 m 2 /g)/burn-off ratio (25.2%) of 34.09 m 2 /(g•%) was identified.

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Mercury occurrence modes in coal and the sulfur–mercury removal performance during coal pyrolysis

Zhang

Dong

et al. 2019

Asia-Pacific J Chem Eng

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The mild pyrolysis of coal provided a promising alternative method for mercury and sulfur emission control before coal combustion. In the work, the occurrence modes of mercury in one lignite and two bituminous coals were characterized by temperature-programmed decomposition with acid leaching. The removal performance of sulfur-mercury was also investigated by mild pyrolysis under weak oxidizing atmosphere. The results showed that the contents of organic-bound mercury, pyrite-bound mercury, and ash-bound mercury were in the range of 35-55%, 15-45%, and 10-45%, with their release temperature in the range of 250-650, 500-700, and >700°C, respectively. Sulfur and mercury were removed by fast pyrolysis at 500°C under 2%O 2 − N 2 atmosphere, and the proportion of Hg 2+ in gas phase increased. The results indicated that the oxygen had participated in the decomposition of the mercury-containing and sulfur-containing compounds, and some stable mercury-containing and sulfur-containing compounds were easier for decomposition under weak oxidizing atmosphere at low temperature. The removal efficiency of sulfur and mercury significantly increased under weak oxidizing atmosphere by fast pyrolysis. It was because fast pyrolysis could accelerate the breakup of molecular bonds associated with sulfur-mercury at a low temperature. The pore structure of char produced by fast pyrolysis was improved, which was favorable for sulfur containing gas and mercury release.

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Low temperature entrained flow pyrolysis and gasification of a Victorian brown coal

Cited by 37 publications

References 18 publications

High‐temperature pyrolysis and CO₂ gasification of Victorian brown coal and Rhenish lignite in an entrained flow reactor

High‐temperature pyrolysis and CO₂ gasification of Victorian brown coal and Rhenish lignite in an entrained flow reactor

Effect of pyrolysis conditions on the improvement of the physicochemical structure of activated carbon obtained from Jixi bituminous coal

Mercury occurrence modes in coal and the sulfur–mercury removal performance during coal pyrolysis

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Low temperature entrained flow pyrolysis and gasification of a Victorian brown coal

Cited by 37 publications

References 18 publications

High‐temperature pyrolysis and CO2 gasification of Victorian brown coal and Rhenish lignite in an entrained flow reactor

High‐temperature pyrolysis and CO2 gasification of Victorian brown coal and Rhenish lignite in an entrained flow reactor

Effect of pyrolysis conditions on the improvement of the physicochemical structure of activated carbon obtained from Jixi bituminous coal

Mercury occurrence modes in coal and the sulfur–mercury removal performance during coal pyrolysis

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High‐temperature pyrolysis and CO₂ gasification of Victorian brown coal and Rhenish lignite in an entrained flow reactor

High‐temperature pyrolysis and CO₂ gasification of Victorian brown coal and Rhenish lignite in an entrained flow reactor