An approach for utilization of direct coal liquefaction residue: Blending with low-rank coal to prepare slurries for gasification

Lv, Dongmei; Yuchi, Wei; Bai, Zongqing; Bai, Jin; Kong, Lingxue; Guo, Zhenxing; Yan, Jingchong; Li, Wen

doi:10.1016/j.fuel.2014.12.075

Cited by 56 publications

(30 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the contact angles of DCLR and DEMs are measured, all the samples show values over 90° (shown in Table 3), implying that the hydrophilic performance of DCLR does not change with the increasing content of hydroxyl groups after demineralization. Our previous study found that the absorption band between 3200 and 3400 cm −1 for DCLR was not observed, when the infrared spectra of DCLR and low‐rank coal were piled up 11 . As a result, we can assume that in spite of slight enhancement of the absorption intensity corresponding to the OH group after moderate acid leaching, the surface properties of DCLR may not be apparently affected.…”

Section: Resultsmentioning

confidence: 93%

See 1 more Smart Citation

Properties of direct coal liquefaction residue water slurry: Effect of mineral matters by acid‐leaching demineralization

Wang

et al. 2022

Asia-Pacific J Chem Eng

Self Cite

View full text Add to dashboard Cite

The effects of demineralization treatment by acid leaching on the properties of direct coal liquefaction residue water slurry (DCLRWS) were investigated. The demineralized direct coal liquefaction residue (DCLR) with different mineral matter content and composition was prepared by leaching with the solution of HCl/HF, HCl, and HF, designated as DEM-1, DEM-2, and DEM-3, respectively. After demineralization, the slurryability of DCLR decreases but their effective solid loading (ash-free basis) increases. The results indicate that metallic minerals are the principal factor improving the slurryability of DCLRWS, mainly by increasing the dispersant adsorption capacity of DCLR. In addition, the decreasing density of DCLR after demineralization is not advantageous to its slurryability. DCLRWSs prepared by DCLR, DEM-1, and DEM-2 all have the same stabilization time (2 days), indicating that removal of metallic minerals could not deteriorate the stability. However, after removal of clay minerals, the slurries prepared by DEM-3 tend to form sediment after stopping high-speed stirring, attributed to its lowest zeta potential and loss of stability due to clay minerals. Except for DEM-3, the slurries prepared by other three samples all have a shear-thinning behavior, with the strongest behavior observed for DEM-1 slurry.

show abstract

Section: Resultsmentioning

confidence: 93%

“…The slurries of different DCLR and DEMs were prepared as per the procedure described elsewhere 11 . We used NSF (naphthalenesulfonate‐formaldehyde condensate) as the dispersant in this work.…”

Section: Methodsmentioning

confidence: 99%

Properties of direct coal liquefaction residue water slurry: Effect of mineral matters by acid‐leaching demineralization

Wang

et al. 2022

Asia-Pacific J Chem Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, due to high ash content and Fe content, exploiting LSP in the entrained flow gasification alone could be challenging to the stable operation and slag discharge of gasifier. 10 Meanwhile, LC has high calcium and high iron contents; hence, LC is generally considered to have a poor fluidity at high temperature and is difficult to be used in entrained flow gasification alone. 28 Therefore, the co-gasification of LC and LSP could be an effective approach in entrained flow gasification scheme.…”

Section: Characteristics Of Raw Materialsmentioning

confidence: 99%

“…9 If the LSP is effectively utilized, some coals with poor quality can also be utilized in entrained flow gasification. 10 Meanwhile, the LSP contains hydrogenation products (such as heavy oil, asphaltene, and pre-asphaltene), unconverted residual coal (coke), and liquefaction catalyst. 11 The alkali and alkaline earth metals and Fe-based catalysts enriched in LSP can play a catalytic role in coal gasification reaction.…”

Section: Introductionmentioning

confidence: 99%

Study on the fluidity of ash slag of liquefaction solid product and lignite co‐gasification

Wang

Liu

Guo

et al. 2021

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

The utilization of liquefaction solid product (LSP) obtained from fluidization reaction pyrolysis has become a pressing obstacle limiting the industrialization of coal liquefaction technology. In this work, gasification of LSP and Hami lignite coal (LC) and their blend at different ratios was investigated. In addition, the melt flow, mineral transformation, and crystallization behavior in the fusion process and cooling process were investigated. The results show that both LSP and LC are typical crystalline slags and cannot be applied to entrained flow gasification alone. The co-gasification of LC and LSP is a feasible method to improve their fluidity. At the ratio of 2:1 (LC to LSP), the blend has the lowest AFT. For molten slag, viscosity of the sample corresponded well to the structure of the slag. LC1:2LSP with higher Q 2 and Q 3 content showed a high viscosity, while LC1:2LSP with higher Q 0 and Q 1 content showed a lower viscosity. Besides, the size of the crystals generated during cooling is inversely proportional to the high-temperature viscosity of the sample, the migration of ions became difficult, and the growth of crystal size was inhibited at high viscosity. Meanwhile, the slag type of samples was influenced by the precipitated crystals. T cv can be effectively reduced by blending LC with LSP in a certain proportion. The results provide a theoretical basis for the utilization of LSP for the operation of entrained flow gasification.

show abstract

“…5,6 Therefore, it was signicant to study the rheological properties of the CWS, which are generally inuenced by the coal properties (including the coal rank, coal porosity, particle size, mineral composition, etc. ), 7,8 preparation technology (including picking, crushing, grinding, mixing and shearing), 9 and the additives. 10,11 It was learned that increasing the coal rank can improve the slurry ability of coal and this could be relevant to the lower O/C ratio in the higher coal rank.…”

Section: Introductionmentioning

confidence: 99%

Influence of different dispersants on rheological behaviors of coal water slurry prepared from a low quality coal

Liu

Yang

et al. 2019

RSC Adv.

View full text Add to dashboard Cite

show abstract

An approach for utilization of direct coal liquefaction residue: Blending with low-rank coal to prepare slurries for gasification

Cited by 56 publications

References 22 publications

Properties of direct coal liquefaction residue water slurry: Effect of mineral matters by acid‐leaching demineralization

Properties of direct coal liquefaction residue water slurry: Effect of mineral matters by acid‐leaching demineralization

Study on the fluidity of ash slag of liquefaction solid product and lignite co‐gasification

Influence of different dispersants on rheological behaviors of coal water slurry prepared from a low quality coal

Contact Info

Product

Resources

About