Theoretical and experimental demonstration of lignite chemical looping gasification of phosphogypsum oxygen carrier for syngas generation

Yang, Jie; Ma, Liping; Dong, Senlin; Liu, Hongpan; Zhao, Siqi; Xiaojing, Cui; Zheng, Dalong; Yang, Jing

doi:10.1016/j.fuel.2016.12.077

Cited by 55 publications

(37 citation statements)

References 34 publications

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“…The coal gasification reaction indices of NX, XJ, NM and SX all increase as the temperature increases, mostly because of the endothermic nature of coal gasification and the fact that endothermic processes are fueled by temperature increases. [20] When the temperature increased from 800 ℃ to 950 ℃ for NX, NM, SX and XJ coals, syngas yields increased by 0.8-1 m3/kg, which suggested that temperature had a great effect on the gasification rate of Chinese western bituminous coals. For NX, NM, SX and XJ, an increased temperature increased the reaction index and syngas yield.…”

Section: 2effect Of Temperature On Chemical-looping Gasificationmentioning

confidence: 99%

Investigation of Chemical-looping Gasification Characteristics of Chinese Western Coals with Hematite-CuO Oxygen Carrier

Yuan

Sun³

et al. 2020

E3S Web Conf.

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In order to realize highly efficient conversion of Chinese western bituminous coals into syngas, a series of chemical-looping gasification experiments was conducted with hematite-CuO oxygen carrier in a laboratory-scale fluidized-bed reactor. The results indicated that the gasification rate of Chinese western bituminous increased by 2-3 times after addition of a hematite-CuO oxygen carrier. Meanwhile, the syngas yields of Chinese western bituminous ranged from 1.84–2.04 m3/kg, three times higher than that of lignite. This shows that the combination of chemical-looping technology and gasification of coal can achieve efficient conversion of Chinese/western bituminous coals. The temperature and the supply oxygen coefficient (O/C) all demonstrated a clear effect on the gasification rates and the gas yields. 10 cycles of redox experiments indicated that the hematite-CuO oxygen carriers have good recycled reaction characteristics. Those results provide theoretical guidance for the efficient conversion of Chinese western bituminous coals into syngas via chemical-looping gasification.

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Section: 2effect Of Temperature On Chemical-looping Gasificationmentioning

confidence: 99%

Investigation of Chemical-looping Gasification Characteristics of Chinese Western Coals with Hematite-CuO Oxygen Carrier

Yuan

Sun³

et al. 2020

E3S Web Conf.

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“…High-purity CaO can be prepared using the two-step method of phosphogypsum decomposition by changing the reaction atmosphere from a reducing atmosphere to an oxidizing atmosphere circularly to obtain more CaO [24,44]. The main reactions of the two-step method for phosphogypsum decomposition to prepare high-purity CaO are as follows: .…”

Section: 1 Preparation Of High-purity Cao In Equilib Modulementioning

confidence: 99%

“…High‐purity CaO can be prepared using the two‐step method of phosphogypsum decomposition by changing the reaction atmosphere from a reducing atmosphere to an oxidizing atmosphere circularly to obtain more CaO 24, 44. The main reactions of the two‐step method for phosphogypsum decomposition to prepare high‐purity CaO are as follows:

true normalCaS {normalO}_{4} normal+ 4 normalCO normal\to normalCaS normal+ 4 normalC {normalO}_{2}

true normalCaS {normalO}_{4} normal+ normalCO normal\to normalCaO normal+ normalC {normalO}_{2} normal+ normalS {normalO}_{2}

true normalCaS normal+ 2 {normalO}_{2} normal\to normalCaS {normalO}_{4}

true 2 normalCaS normal+ 3 {normalO}_{2} normal\to 2 normalCaO normal+ 2 normalS {normalO}_{2}

true normalCaS normal+ 3 normalCaS {normalO}_{4} normal\to 4 normalCaO normal+ 4 normalS {normalO}_{2}

…”

Section: Thermodynamic Calculations Of Phosphogypsum Decomposition Sl...mentioning

confidence: 99%

Phosphogypsum Resource Utilization Based on Thermodynamic Analysis

et al. 2022

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The application of FactSage software in phosphogypsum resource utilization is described. Thermodynamic analysis is not only useful for predicting the amount and type of products including gases and solids under various conditions, but also for investigating the thermodynamic properties of related reactions. Statistical data analysis is conducted using the equilib module, reaction module, and phase diagram module of FactSage. The optimal conditions and mechanisms to utilize phosphogypsum for its products CaS, CaO, and CaCO3 are summarized. This comprehensive review on thermodynamic analysis in phosphogypsum resource utilization for the mentioned products is valuable for academicians, scientists, and researchers.

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“…To promote the utilization of PG, the present study focuses on the application of high-silicon PG for CLG using lignite as fuel due to the high content of fixed carbon (62.47% by weight dry) and the high reactivity of the char during gasification. 38 Silicon is the most important minor element in PG in addition to the major elements Ca, S, and O. 39 SiO 2 as a gangue material is usually used as an additive to trap alkali in the solid phase.…”

Section: Introductionmentioning

confidence: 99%

Gasification Performance and Mechanism of High-Silicon Phosphogypsum Oxygen Carrier in Chemical Looping Gasification

et al. 2019

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The phosphogypsum (PG) stockpile in Yunnan, China, is one of the largest accumulations of PG. Our group has focused on the application of chemical looping gasification (CLG) with a PG oxygen carrier characterized by high silicon content. FactSage 7.1 software was used for the thermodynamic simulation analysis of the reaction mechanism and reaction characteristics at different temperatures. Experiments were conducted at a laboratory scale in a fixed-bed facility with lignite as fuel using PG as an oxygen carrier and N2/H2O as gasifying agents at a temperature of 1173 K. We investigated the gasification performance and silicon transfer behavior during chemical looping gasification using X-ray fluorescence spectrometry, X-ray diffractometry, X-ray photoelectron spectroscopy, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. The results indicated that the silicon in PG participated in the production of syngas through a series of parallel and tandem side reactions (R10–R15) during the reduction process. The high-silicon PG was more conducive to syngas production than the desilicated PG during the reduction process of CLG under the investigated experimental conditions. At 1173 K, the sequence of the parallel reactions was R15 > R8 > R12 > R9, suggesting that an increase in the silicon content inhibited the production of H2S (R8) by increasing the silicon content, which is highly desirable for a clean production process. In CLG, the silicon in the fresh oxygen carrier PG was transformed from SiO2 into CaSiO3, Ca3SiO7, and Ca2SiO4; distributed unevenly; and attached to the surface of CaSO4 after eight cycles. The theory of the Zener effect was developed to understand the mechanism of the interaction between the inert support SiO2 and PG oxygen carrier.

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Theoretical and experimental demonstration of lignite chemical looping gasification of phosphogypsum oxygen carrier for syngas generation

Cited by 55 publications

References 34 publications

Investigation of Chemical-looping Gasification Characteristics of Chinese Western Coals with Hematite-CuO Oxygen Carrier

Investigation of Chemical-looping Gasification Characteristics of Chinese Western Coals with Hematite-CuO Oxygen Carrier

Phosphogypsum Resource Utilization Based on Thermodynamic Analysis

Gasification Performance and Mechanism of High-Silicon Phosphogypsum Oxygen Carrier in Chemical Looping Gasification

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