Effects of atmospheres on sulfur release and its transformation behavior during coal thermolysis

Yang, Na; Guo, Honglian; Liu, Fenrong; Zhang, Hao; Hu, Yongfeng; Hu, Ruisheng

doi:10.1016/j.fuel.2017.11.099

Cited by 46 publications

(18 citation statements)

References 26 publications

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“…The total sulfur content containing mercaptans are of the widely known contaminants in transportation fuels containing gasoline and diesel . Due to the harmful effects of sulfur‐containing materials, such as catalyst poisoning and global environmental‐protection issues, it is extremely recommended to remove these compounds before commercial use . As an urgent task, therefore, development of desulfurization processes has dedicated many efforts presently to achieve deep sulfur‐removal of transportation fuels.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Computational Study of Organic Sulfur Removal Proficiency of (Ni, Cu, Co)‐Doped ZIF‐8 Adsorbents

Saeedirad

Ganjali

Rashidi³

et al. 2020

ChemistrySelect

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The synthesis and characterization of a series of metal‐doped ZIF‐8 (metal=Ni, Co and Cu) has been introduced to gain the highly efficient adsorption of dibenzothiophene (DBT) in liquid phase. Under 150 ml DBT/iso‐octane, 100–1700 ppm, and 25–85 °C, the excellent efficiency and reusability in DBT removal was achieved and fitted better with the pseudo‐first order reaction. The maximum adsorption of 191.84 mg S/g for Ni/ZIF‐8 and two steps for intraparticle diffusion study contrary to Cu‐ and Co‐ZIF‐8 suggested the presence of Ni‐HMeIM clusters in ZIF‐8 cavities. Comparing the performance of prepared adsorbents, the order of qmax and PC was the same, i. e. PC Ni/ZIF‐8> PC Cu/ZIF‐8>PC Co/ZIF‐8>PC ZIF‐8 and qmax (Ni/ZIF‐8)> qmax (Cu/ZIF‐8)> qmax (Co/ZIF‐8)> qmax (ZIF‐8) for both 10% and 100% BT. The prepared adsorbents had the FoMs ranging from 0.05‐0.07 that compared to other adsorbents showed the beneficial use for large scale desulfurization process. The endothermic behavior and a homogeneous adsorption was then indicated through thermodynamic and equilibrium studies.

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Section: Introductionmentioning

confidence: 99%

Experimental and Computational Study of Organic Sulfur Removal Proficiency of (Ni, Cu, Co)‐Doped ZIF‐8 Adsorbents

Saeedirad

Ganjali

Rashidi³

et al. 2020

ChemistrySelect

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“…7,53−55 These results obtained in this study are consistent with other work on sulfur transformation at elevated temperatures to form H 2 S, COS, and SO 2 during pyrolysis and gasification. 44,45 The following possible reaction between pyrite and hydrogen from the organic matter can take place at elevated temperatures (400–950 °C) to form hydrogen sulfide and pyrrhotite under inert conditions. 9,10 The reaction that then takes place isThe XRD and inductively coupled plasma mass spectrometry (ICP-MS) results for the yellow precipitate samples clearly confirmed that the purity of the amorphous samples (Figure 8) is 95% containing mainly Cd (77%) and S (18%).…”

Section: Results and Discussionmentioning

confidence: 99%

“…This suggests that almost >90% of sulfur was retained in the ash and char samples containing anhydrite and in potassium carbonate melt or potash aluminosilicate glasses produced from coal C. Low masses of hydrogen sulfide and sulfur dioxide and low H 2 S to SO 2 ratios can be attributed to reactions among hydrogen sulfide, potassium ions, and water to form potassium hydrogen sulfide. Also, hydrogen sulfide can react with carbon monoxide from decomposition of organic oxygen functional groups to form COS. 41,42,45…”

Section: Results and Discussionmentioning

confidence: 99%

In Situ Capturing and Absorption of Sulfur Gases Formed during Thermal Treatment of South African Coals

et al. 2018

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The objective of this study, the first of its kind on these specific South African low-sulfur coals, was to capture H 2 S and SO 2 produced under inert and oxidizing conditions from sulfur compounds present in the coals. The capturing agents were calcium and magnesium oxides formed during the transformation of calcite and dolomite. The effectiveness of two different scrubbing solutions (0.15 M cadmium acetate and 1.1 M potassium hydroxide) for absorption of volatilized H 2 S and SO 2 was also investigated. The bituminous coal (coal A) contained dolomite, calcite, pyrite, and organic sulfur. Lignite (coal B) had a high organic sulfur content and contained gypsum, no or low dolomite and pyrite contents, and no calcite. A third sample (coal C) was prepared by adding 5 wt % potassium carbonate to coal A. Under oxidizing conditions and at elevated temperatures, FeS 2 produced Fe 2 O 3 , FeO, and SO 2 . It transformed to FeS and released H 2 S under inert conditions. Organic sulfur interacted with organically bound calcium and magnesium at 400 °C in an inert atmosphere to form calcium sulfate and oldhamite ((Ca,Mg)S). CaO, produced from calcite or dolomite, reacted with SO 2 and O 2 at 950 °C to form calcium sulfate. Treatment of lignite at 400–950 °C resulted in 96–98% evolution of sulfur as gases. Hydrogen sulfide formation increased with the increasing thermal treatment temperature under inert conditions for the three coals. Under oxidizing conditions, sulfur dioxide formation decreased with the increasing temperature when heating coals B and C. The lowest ratio (0.01) of H 2 S to SO 2 was achieved during thermal treatment of the blend of coal and potassium carbonate (coal C), implying that almost all of sulfur was retained in the coal C ash/char samples. In situ capturing of sulfur gases by CaO and MgO and by the added K 2 CO 3 in coal C to form calcium/magnesium/potassium sulfates and potassium/calcium/magnesium aluminosilicate glasses during utilization of these and similar coals could reduce the percentage of sulfur volatilized from the coals by 54–100%, thereby potentially decreasing their impact on the environment.

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“…The dense phase region was entirely in a reducing atmosphere, while the diluted phase region was in an oxidizing atmosphere. These difference in the atmosphere resulted in different mechanisms of sulfur precipitation and different sulfur-containing substances [25].…”

Section: Thermodynamic Equilibrium Calculation Of Sulfur-containing Smentioning

confidence: 99%

Sulfur Conversion of Mixed Coal and Gangue during Combustion in a CFB Boiler

Zhao

Zeng

et al. 2020

Energies

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The construction of a power plant using a 660 MWe supercritical circulating fluidized bed (CFB) boiler with co-combustion of coal and gangue has been proposed in China. Therefore, this study simulated the distribution law and transformation mechanism of sulfur-containing phases using three low-calorific samples of gangue and coal mixtures under different conditions, based on the thermodynamic simulation software HSC Chemistry. The results showed that sulfur low in calorific value coal is mainly converted into gas phase SO2, solid phase alkali metal sulfate (Na2SO4 and K2SO4), and alkaline earth metal sulfate (CaSO4 and MgSO4) in an oxidizing atmosphere. Under a reductive atmosphere, sulfur in coal is mainly converted into gaseous H2S, COS (Carbon oxysulfide), and solid FeSx. With an increase in the O/C ratio, the distribution curve of sulfur-containing substances contracted to lower temperatures. It was established that the sulfur fixation capacity of coal ash depends on the relative amounts of basic oxides and sulfur present in it. Relevant conclusions were also verified and compared to those of the laboratory small-fluidized bed test bench and the 3 MWth CFB combustion test bench.

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Effects of atmospheres on sulfur release and its transformation behavior during coal thermolysis

Cited by 46 publications

References 26 publications

Experimental and Computational Study of Organic Sulfur Removal Proficiency of (Ni, Cu, Co)‐Doped ZIF‐8 Adsorbents

Experimental and Computational Study of Organic Sulfur Removal Proficiency of (Ni, Cu, Co)‐Doped ZIF‐8 Adsorbents

In Situ Capturing and Absorption of Sulfur Gases Formed during Thermal Treatment of South African Coals

Sulfur Conversion of Mixed Coal and Gangue during Combustion in a CFB Boiler

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