Transformation of heavy metals in lignite during supercritical water gasification

Chen, Guifang; Yang, Xinfei; Chen, Shouyan; Dong, Yong; Cui, Lin; Zhang, Yong; Wang, Peng; Zhao, Xinbing; Ma, Chunyuan

doi:10.1016/j.apenergy.2016.11.054

Cited by 30 publications

(5 citation statements)

References 32 publications

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“…The other occurrence modes remained unchanged, indicating that the organic matter was decomposed to form the residual. The result was consistent with the conclusion of Chen et al that heavy metals in unstable chemical fractions can release and react with oxides or SiO 2 to form a stable fraction. The residual fraction started to transform into the occurrence modes of exchangeable, carbonates, and iron–manganese oxides when the temperature exceeded 900 °C.…”

Section: Resultssupporting

confidence: 92%

Investigation of the Transformation Behavior of Nickel and Vanadium during Steam Gasification of Petroleum Coke

Nie

Wang

et al. 2018

Ind. Eng. Chem. Res.

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The gasification of petroleum coke (petcoke) can cause fouling and erosion problems. In this study, the evolution of Ni and V during steam gasification is investigated in a fluidized bed from 800 to 1100 °C. The occurrence modes determined by the sequential extraction show that raw petcoke contains diversified Ni forms, whereas V is dominated by organic matter and residual form. The organic matter is rapidly converted to residual form. The Ni in residual form is partially released, whereas the V in residual form is considerably converted to other forms. The volatilization of Ni is positively correlated with the temperature and sulfur content, whereas V has a positive correlation with the exchangeable form. The exchangeable form of V is conducive to forming a well-developed pore structure, whereas carbonates play the opposite role. Under the practical fluidized bed gasification, Ni tends to cause erosion, especially for continental petcoke, whereas V is inclined to cause slagging and fouling.

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Section: Resultssupporting

confidence: 92%

Investigation of the Transformation Behavior of Nickel and Vanadium during Steam Gasification of Petroleum Coke

Nie

Wang

et al. 2018

Ind. Eng. Chem. Res.

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“…The contents of heavy metals in liquid product were far below the permitted limits of Chinese EPA [13]. It has been reported that none of the heavy metals were detected in the gas phase under the SCWO conditions [14]. Heavy metals could be co-precipitated with Fe-Mn oxides which could be formed under SCWO condition or be oxidized to oxides.…”

Section: Transformation Of Heavy Metalsmentioning

confidence: 99%

Oxidation of Dyeing Sludge in Supercritical Water

Wang

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this study, the effect of SCWO treatment, transformation characteristics of heavy metals and corrosion of Ni-based alloy 625 during dyeing sludge supercritical water oxidation (SCWO) were investigated. The experiment carried out at 580℃, 25MPa, oxidation coefficient of 1.3, reaction residence time 10min. The removal rate of COD reached 99.3% at the optimum reaction conditions which means the COD is almost completely destructed. Results of heavy metals determination showed that the concentration of Cu in the liquid products was 0.266mg/L, while Zn and Pb could not be detected under the experimental conditions. This implied that Cu, Zn and Pb in residues after SCWO treatment were more stable than that in raw sludge. The corrosion behaviour of Ni-based alloy 625 was discussed in different conditions. Consequently, it is believed that SCWO treatment is an effective alternative for safety disposal of dyeing sludge.

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“…Thus, gasification is employed as an alternative coal utilization method for pollutant emission control. The supercritical water (SCW) coal gasification has got increased attention thanks to its efficient and clean performance [3].…”

Section: Introductionmentioning

confidence: 99%

A High-Efficiency Power Generation System Based on Self-Sustaining Supercritical Water Coal Gasification

Changchun¹,

Liu²,

Wang³

et al. 2021

Preprint

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An innovative high-efficiency power generation system is developed and investigated in this paper. Based on self-sustaining supercritical water coal gasification, the thermal energy of the syngas is cascade utilized according to its temperature and pressure, both sensible and latent heat of the syngas can be recycled into the system, and thereby the net power efficiency can be about five percentage points higher than that of the traditional GE gasification based power plant. The exergy analysis shows that the exergy efficiency of the proposed system reaches 49.17%, which is 10.72% higher than that of the reference system, and the improvement in exergy efficiency of the proposed system mainly comes from the exergy destruction decline of the syngas energy recovery process and the gas compression process. The syngas combustion process is the highest exergy destruction process with a value of 183.77 MW in the proposed system. Further improvement in the system performance of the proposed system lies in the utilization of syngas.

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Transformation of heavy metals in lignite during supercritical water gasification

Cited by 30 publications

References 32 publications

Investigation of the Transformation Behavior of Nickel and Vanadium during Steam Gasification of Petroleum Coke

Investigation of the Transformation Behavior of Nickel and Vanadium during Steam Gasification of Petroleum Coke

Oxidation of Dyeing Sludge in Supercritical Water

A High-Efficiency Power Generation System Based on Self-Sustaining Supercritical Water Coal Gasification

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