Investigation into sulfur release in reductive decomposition of calcium sulfate oxygen carrier by hydrogen and carbon monoxide

Tian, Hongjing; Guo, Qingjie; Yue, Xuehai; Liu, Yongzhuo

doi:10.1016/j.fuproc.2010.06.013

Cited by 47 publications

(26 citation statements)

References 31 publications

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“…As demonstrated by many previous investigations, the release of sulfur varies with the operating conditions [14][15][16][17]29], particularly the CaSO 4 /C molar ratios. When CaSO 4 was scarce, H 2 S and COS as the main sulfurous gasses were generated from reactions R7 and R9.…”

Section: Sulfur Release With Caso 4 /Ben and Caso 4 -Cao/ben Oxygen Cmentioning

confidence: 70%

“…CaSO 4 has recently emerged as a promising candidate oxygen carrier for chemical-looping processes [13,14]. This material is a readily available and inexpensive sulfate that is distributed worldwide.…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al [22] investigated coal CLC and showed that the addition of Ca and K to coal can reduce the gasification temperature. Tian et al [14] prepared a compound CaCO 3 /CaSO 4 oxygen carrier and observed that the addition of CaCO 3 nanoparticles greatly enhanced the recyclability of the oxygen carrier. In this work, a Ca-based compound oxygen carrier (CaSO 4 -CaO/Ben) was prepared by loading CaSO 4 and CaO on bentonite (Ben) particles using a mechanicalmixing impregnation method.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coal chemical-looping gasification of Ca-based oxygen carriers decorated by CaO

Guo

Liu

et al. 2015

Powder Technology

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Section: Sulfur Release With Caso 4 /Ben and Caso 4 -Cao/ben Oxygen Cmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coal chemical-looping gasification of Ca-based oxygen carriers decorated by CaO

Guo

Liu

et al. 2015

Powder Technology

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“…As illustrated in many investigations [20,[30][31][32][33][34], the emission of sulfur involves with CaSO 4 and CaS is varied with the operating conditions. In this study, SO 2 and H 2 S formation are mainly due to the competing side reactions (Eqs.…”

Section: Sulfur Releasementioning

confidence: 99%

Development and performance of binder-supported CaSO4 oxygen carriers for chemical looping combustion

Ding

Zheng

Luo

et al. 2011

Chemical Engineering Journal

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“…This is a serious problem for Ca-based oxygen carriers in CLC system. Tian [23] prepared the compound CaCO 3 / CaSO 4 oxygen carrier and observed the addition of CaCO 3 nanoparticles largely promoted the recyclability of the oxygen carrier. In this paper, it is found that the partial pressure of reductive gas directly affects sulfur evolution.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a New Chemical-Looping Combustion Process without Sulfur Evolution Based on Ca-Based Oxygen Carrier

Tian

Chang

et al. 2014

International Journal of Chemical Reactor Engineering

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Calcium sulfate (CaSO 4 ) is a promising oxygen carrier for chemical-looping combustion system. The release of sulfurous gas in the circulating of Ca-based oxygen carrier is a crucial problem. In this paper, it is found that the released amount of sulfurous gas is greatly affected by the partial pressure of reductive gas. If the partial pressure of the mixed reductive gases, composed of H 2 and CO, maintains higher than 40 kPa, the sulfurous gas can be completely eliminated even at the reacting temperature higher than 1,000°C. Therefore, a new chemical-looping combustion system based on CaSO 4 and NiO oxygen carrier, without any sulfur evolution, is simulated using Aspen Plus software. In the system, the syngas is generated from the steam gasification of coal and reacts with CaSO 4 and NiO consecutively. The sulfur release occurred in the circulating of Ca-based oxygen carriers can be prevented because the concentrations of CO and H 2 keep higher than 45% in the presence of Cabased oxygen carriers. The suitable operating regime, in which auto-thermally operating of the system, zero-sulfur release and easy sequestration of CO 2 from the flue gas are realized, is proposed in this paper. The effects of fuel reactor temperature, air reactor temperature and the recycle rate of oxygen carrier on the released heat from the system and the concentration of CO 2 and H 2 O are also studied in the paper.

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Investigation into sulfur release in reductive decomposition of calcium sulfate oxygen carrier by hydrogen and carbon monoxide

Cited by 47 publications

References 31 publications

Coal chemical-looping gasification of Ca-based oxygen carriers decorated by CaO

Coal chemical-looping gasification of Ca-based oxygen carriers decorated by CaO

Development and performance of binder-supported CaSO4 oxygen carriers for chemical looping combustion

Simulation of a New Chemical-Looping Combustion Process without Sulfur Evolution Based on Ca-Based Oxygen Carrier

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