The evolution and desulfurization of sulfur in chemical looping combustion of coal

Luo, Ming; Zhou, Lunzheng; Wang, Chao; Kuang, Cao

doi:10.1080/15567036.2021.1874079

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…These studies were mostly directed toward the combustion of sulfur-containing coal [29,30]. Additionally, more recently there have been investigations of utilizing lime together with iron ore oxygen carriers to remove sulfur from coal in a laboratory fluidized bed [31]. Thermodynamically, the optimal sulfur capture temperature for limestone is around 880 • C, at which temperature CaCO 3 calcines to CaO according to Reaction (R1) [32].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Steel Converter Slag as an Oxygen Carrier—Interaction with Sulfur Dioxide

2022

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Steel converter slag, also called Linz-Donawitz (LD) slag, has been considered as an oxygen carrier for biofuel chemical looping applications due to its high availability. In addition to its content of iron which contributes to its oxygen-carrying capacity, LD slag also contains a significant amount of calcium. Calcium, however, is known to interact with sulfur, which may affect the usability of LD slag. To get a better understanding of the interaction between sulfur and LD slag, batch scale experiments have been performed using solid and gaseous fuel with or without sulfur dioxide, together with LD slag as an oxygen carrier. The reactivity and sulfur interaction were compared to the benchmark oxygen carrier ilmenite. Sulfur increases the gasification rate of biofuel char and the conversion of CO for both LD slag and ilmenite. However, no effect of sulfur could be seen on the conversion of the model tar species benzene. The increased gasification rate of char was suspected to originate from both surface-active sulfur and gaseous sulfur, increasing the reactivity and oxygen transfer of the oxygen carrier. Sulfur was partly absorbed into the LD slag particles with calcium, forming CaS and/or CaSO4. This, in turn, blocks the catalytic effect of CaO towards the water gas shift reaction. When the SO2 vapor pressure was decreased, the absorbed sulfur was released as SO2. This indicates that sulfur may be released in loop-seals or in the air reactor in a continuous process.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Steel Converter Slag as an Oxygen Carrier—Interaction with Sulfur Dioxide

2022

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“…Commonly used sulfur fixing agents [4,5] are CaCO 3 [6,7], Ca(OH) 2 and CaO [8], and non-calcium-based sulfur fixing agents have limited application in coal combustion sulfur fixing due to high prices. Calcium-containing solid waste, such as calcium carbide slag, red mud [9], white mud, fly ash, steel slag, etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of Compound Additives on Sulfur Fixing Performance of Sorbent Based on Steel Slag at High Temperatures

Zhao

Yang

et al. 2022

Processes

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Steel slag is modified with additives to improve its high-temperature sulfur-fixing performance. The effects of sodium lignosulfonate, NaCl, KNO3 and MnO2 on the sulfur fixing performance of steel slag were explored after the ideal calcium–sulfur ratio of steel slag was established to be 2.5. An orthogonal experiment was used to explore the primary and secondary impacts of different additives on the sulfur fixing efficiency. The optimal factor level combination was identified to be 8% sodium lignosulfonate, 1% NaCl, 5% MnO2, and 7% KNO3, with a maximum sulfur fixing efficiency of 70.81%. According to XRF analysis, the sulfur-fixing effect of steel slag with additives was clearly superior to that of steel slag without additives. According to an XRD analysis, the diffraction peak of sulfur-fixing products of steel slag with additives was significantly improved, resulting in a high-temperature resistant phase that prevented sulfur-fixing products from degrading. According to SEM research, the steel slag with additives produced an interface that was conducive to gas–solid interaction in the sulfur fixation process, and sulfur fixed ash of modified steel slag exhibited the surface morphology of a high temperature resistant phase.

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Desulfurization performance of chemical looping conversion using red mud as an oxygen carrier

Jiang

Yan

et al. 2023

Chemical Engineering Journal

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The evolution and desulfurization of sulfur in chemical looping combustion of coal

Cited by 3 publications

References 29 publications

Steel Converter Slag as an Oxygen Carrier—Interaction with Sulfur Dioxide

Steel Converter Slag as an Oxygen Carrier—Interaction with Sulfur Dioxide

Influence of Compound Additives on Sulfur Fixing Performance of Sorbent Based on Steel Slag at High Temperatures

Desulfurization performance of chemical looping conversion using red mud as an oxygen carrier

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