Interactions during co-pyrolysis of direct coal liquefaction residue with lignite and the kinetic analysis

Xu, Junli; Bai, Zongqing; Li, Zheng; Guo, Zhenxing; Pan, Hao; Bai, Jin; Li, Wen

doi:10.1016/j.fuel.2017.11.080

Cited by 32 publications

(10 citation statements)

References 32 publications

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“…This difference can be mainly ascribed to the fact that lignite char has obviously higher surface area than CDLR char. For example, Xu measured the BET surface area of Yunnan lignite char and Shenhua DCLR char as 187.43 and 5.09 m 2 /g, respectively . The other probable explanation is that HL−C presents a more aromatic carbon matrix than that of CR−C .…”

Section: Resultsmentioning

confidence: 99%

“…It was found that the cracking effect of char solid heat carrier produced more light tar fraction and the minerals in char act as the active sites in cracking reactions. Bai's research group studied the co‐pyrolysis of DCLR and coal using thermogravimetry‐mass spectrometry (TG‐MS) technique . They found that increasing DCLR addition decreased the activation energy value for co‐pyrolysis, i. e. the reactivity of the mixed sample increased gradually.…”

Section: Introductionmentioning

confidence: 99%

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A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO₂ Gasification Behavior of the Derived Char

Fan

Chang

et al. 2020

ChemistrySelect

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Co-pyrolysis of direct coal liquefaction residue (DCLR) and low rank coals was regarded as reliable and efficient method to process DCLR. The treatment of the derived co-pyrolysis char is important for the comprehensive utilization of DCLR. In this study, the non-isothermal co-pyrolysis of Shenhua DCLR and Huolinhe lignite, and the isothermal CO 2 gasification of the copyrolysis char were performed by the thermogravimetric analysis method. The interactive effect of co-pyrolysis and the CO 2 gasification behavior of the derived char were explored by comparing the experimental and calculated thermogravimetric/derivative thermogravimetric (TG/DTG) curves and reactivity-conversion (R-x) curves, respectively. The results show that the devolatilization pattern at 200-600°C was modified and part of volatiles were released in advance. As the experimental co-pyrolysis T max was lower by 7-13°C than the calculated value, while it was almost equal to the T max of lignite pyrolysis. We tentatively concluded that lignite devolatilization could promote the evaporation of molten components of DCLR. Moreover, DCLR and lignite could polymerize or condensation with each other at 650-900°C. The lignite char within copyrolysis char could support the char skeleton and hold a high porosity. Therefore, the CO 2 gasification reactivity of co-pyroysis char was promoted and the experimental reactivity exceeded the calculated value over the conversion range of 12-90 %.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO₂ Gasification Behavior of the Derived Char

Fan

Chang

et al. 2020

ChemistrySelect

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“…Direct coal liquefaction residue (DCLR) is the byproduct from direct coal liquefaction, with varying amount, depending on the different liquefaction technologies 1 . For example, in the 1 megaton per year direct coal liquefaction and oil production factory located in Ordos, China, DCLR accounts for 50 to 70 wt% of the raw coal, and contains unreacted coal, minerals, spent catalysts, and considerable heavy components, including heavy oils, asphaltenes, and pre‐asphaltenes 2‐4 . These heavy components are considered as value‐added carbon resources from the viewpoints of the resource conservation and circular economy 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Kinetic study of CO ₂ gasification on coal char and extraction residue char from direct coal liquefaction

Liu

Fang

et al. 2020

Int J Energy Res

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Summary Extraction residue (ER) is, in this study, considered as an insoluble portion derived from a novel extraction process with direct coal liquefaction residue, which is the byproduct from 1000 kton/y direct coal liquefaction and oil production process in Ordos, China. ER mostly consists of unreacted coal and minerals, spent catalyst, and solvent. It is considered as a hazardous waste in China. Gasification is a promising way to employ ER, as the carbon resource contained in it could be adequately utilized, so strongly reducing the environmental impact of this material. In this paper, a kinetic study is carried out concerning CO2 gasification (in thermobalance) of ER char, coal char, and their blends. The results show that, at temperatures ranging from 1123 to 1323 K, the reactivity of ER char is much larger than that of coal char, and the reactivity of ER/coal char blends increases when the ER fraction increases, consistently resulting in between the reactivities shown by ER char and coal char alone. The partial pressure of CO2 promotes the reactivity of all samples. BET surface area resulted three times larger for ER char vs coal char, while pore surface area and pore volume were four times larger. Moreover, the relevant parameters of the random pore model for CO2 gasification of ER char, coal char, and their blend #2 (with 20% ER) were obtained; the activation energy resulted 210.6, 240.5, and 232.8 kJ/mol, and the reaction order 0.30, 0.45, and 0.40, respectively.

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“…[7][8][9] Feng et al 10 found that the minerals in the liquefaction residue of Hami coal mainly included CaCO 3 formed by liquefaction; SiO 2 , NaCl, and Al 2 O 3 ·2SiO 2 ·2H 2 O in raw coal; and the residual catalyst conversion product Fe 1-x S. Li et al 11 noted that the co-pyrolysis of coal and liquefaction residue showed an inhibition of coal pulverization and an increase in tar yield. [7][8][9] Feng et al 10 found that the minerals in the liquefaction residue of Hami coal mainly included CaCO 3 formed by liquefaction; SiO 2 , NaCl, and Al 2 O 3 ·2SiO 2 ·2H 2 O in raw coal; and the residual catalyst conversion product Fe 1-x S. Li et al 11 noted that the co-pyrolysis of coal and liquefaction residue showed an inhibition of coal pulverization and an increase in tar yield.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, many studies are focused on the pyrolysis and gasification of liquefaction residue. [7][8][9] Feng et al 10 found that the minerals in the liquefaction residue of Hami coal mainly included CaCO 3 formed by liquefaction; SiO 2 , NaCl, and Al 2 O 3 ·2SiO 2 ·2H 2 O in raw coal; and the residual catalyst conversion product Fe 1-x S. Li et al 11 noted that the co-pyrolysis of coal and liquefaction residue showed an inhibition of coal pulverization and an increase in tar yield. Xu et al 12 studied the pyrolysis characteristics of the liquefaction residue.…”

Section: Introductionmentioning

confidence: 99%

A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

Guo

Huang

Gong

et al. 2019

Asia-Pacific J Chem Eng

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In this study, the rapid pyrolysis chars of Hami bituminous coal and its liquefaction residue were prepared using a high-frequency furnace. A thermogravimetric analyzer was used to investigate the gasification reactivity and determine the mixing ratio of coal and its liquefaction residue. In addition, a scanning electron microscope, a physisorption analyzer, and a laser raman spectrometer were used to characterize the physicochemical properties of samples. Furthermore, kinetics analysis using the isoconversional method was conducted. The results showed that the gasification reactivity was affected by gasification temperature, pore structure, and carbon structure. When the gasification temperature increased to 1300°C, the gasification reactivity of the liquefaction residue char was close to that of coal char. From the gasification reactivity point of view, the liquefaction residue could be utilized as a raw material in entrained-flow gasification. The mixing ratio of the raw coal to the liquefaction residue was preferably 2:1. The research on activation energy showed that the gasification process belonged to pore diffusion control in the range of temperatures investigated. Specifically, there was a synergistic effect between the coal char and the liquefaction residue char in co-gasification, which was beneficial to the gasification reaction. study on high-temperature cogasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue. Asia-Pac J Chem Eng. 2020;15:e2376. https://doi.

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Interactions during co-pyrolysis of direct coal liquefaction residue with lignite and the kinetic analysis

Cited by 32 publications

References 32 publications

A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO₂ Gasification Behavior of the Derived Char

A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO₂ Gasification Behavior of the Derived Char

Kinetic study of CO ₂ gasification on coal char and extraction residue char from direct coal liquefaction

A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

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Interactions during co-pyrolysis of direct coal liquefaction residue with lignite and the kinetic analysis

Cited by 32 publications

References 32 publications

A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO2 Gasification Behavior of the Derived Char

A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO2 Gasification Behavior of the Derived Char

Kinetic study of CO 2 gasification on coal char and extraction residue char from direct coal liquefaction

A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

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A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO₂ Gasification Behavior of the Derived Char

A TGA Investigation to Co‐Pyrolysis Characteristics of Shenhua Direct Coal Liquefaction Residue and Huolinhe Lignite and the CO₂ Gasification Behavior of the Derived Char

Kinetic study of CO ₂ gasification on coal char and extraction residue char from direct coal liquefaction