Drying and depolymerization technologies of Zhaotong lignite: A review

Li, Zhan-Ku; Yan, Hong-Lei; Yan, Jingchong; Wang, Zhicai; Lei, Zhiping; Ren, Shibiao; Shui, Hengfu

doi:10.1016/j.fuproc.2019.01.002

Cited by 51 publications

(15 citation statements)

References 69 publications

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“…The development of the surface cracks of an SHLP after binarization treatment is shown in Figure 6. It can be clearly seen that there were primary cracks (drying time of 0 s) on the surface of the hard lignite, which is different from Zhaotong lignite in the literature, [ 48 ] that is, Zhaotong lignite, as a soft lignite, [ 51 ] has no primary cracks on its surface. In the early stage of drying, the surface cracks of lignite rapidly developed to their maximum number and sizes.…”

Section: Resultsmentioning

confidence: 97%

Moisture removal behaviour of single hard lignite particle during drying and quantitative characterization for its surface damage

et al. 2021

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It is extremely meaningful to study the damage behaviour of lignite for safe operation during the drying process. In this study, a single hard lignite particle (SHLP) was prepared for drying. The drying characteristics of an SHLP were described, and its drying kinetics were studied from the perspective of the drying model and effective diffusion coefficient (Deff). The development of surface cracks in drying were obtained, and the changes in surface damage were quantitatively described by relative crack rate (RCR). The results showed that the drying process for an SHLP was divided into three stages following the slope of the drying curve. The rapid removal of a large proportion of moisture mainly occurred in stage I. The Page model is the best model for describing the drying of an SHLP. In addition, Deff increased with increasing drying time. High temperature promoted the moisture transfer from the inside to the surface of an SHLP. Finally, surface cracks on the SHLP developed rapidly in the early drying stage; specifically, the primary cracks widened and lengthened, and the small cracks mainly attached to the primary cracks. In the later drying stage, cracks shrank and cracks in the branch structure closed. High drying temperature made the RCR of an SHLP reach the maximum value more quickly in stage I.

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Section: Resultsmentioning

confidence: 97%

Moisture removal behaviour of single hard lignite particle during drying and quantitative characterization for its surface damage

et al. 2021

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“…The MSW used in this research was obtained from a ballistic separation of excavated waste from the Mont-Saint-Guibert landfill in Belgium. For the gasification tests, the lightest waste fraction between 200-90mm was selected (also known as a 2D fraction) due to its high calorific value (22.4 MJ/kg) [58] which is comparable to the one of woody biomass (around 20 MJ/kg) [59] and low-rank coals [60] (between 18-24 MJ/kg). The fraction consisted of 0.7% wood, 3.5% paper, 8.4% textile, 42.3% plastics, 10.5% other combustible materials, 1.9% metals, 1.5% inert materials, and 31.2% fine particles as was measured by a hand sorting method by García-Lopez et al [58].…”

Section: Municipal Solid Waste Preparationmentioning

confidence: 99%

Seashell waste-derived materials for secondary catalytic tar reduction in municipal solid waste gasification

Gomez-Rueda

Zaini

Yang

et al. 2020

Biomass and Bioenergy

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Catalytic tar removal from producer gas is critical for the economic feasibility of Municipal Solid Waste (MSW) gasification in the waste-to-energy(WtE) approach. Nickel-and noble-metal catalysts have the highest tar cracking activities, but they increase costs, use scarce materials, and generate dangerous byproducts. To overcome these drawbacks, naturally occurring materials should be used for tar cracking. In this paper, two nanomaterials, synthesized from oyster and mussel waste shells respectively, are used to clean syngas from MSW in a secondary tar cracking unit. We observed that they reform class 1 tar (heavy tars that condense at high temperatures at very low concentrations) into class 3 tar (light hydrocarbons that are not important in condensation) and benzene. Although both catalysts' composition and textural properties were identical, crystallite size and especially specific surface area variation was enough to generate a change in product selectivity.A larger crystallite size and SSA shows a soot yield reduction of 95% with respect to the non-catalytic case, simultaneously increasing the H 2 /CO at 1000 • C.

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“…One technique to reduce moisture content is thermal coal drying (Osman et al, 2011). Thermal coal drying is the most straightforward drying technology and increases the heating value (Li et al, 2019). The thermal evaporative drying is conducted in a fluidized bed, rotary drying, hot oil-immersed drying, and microwave drying (Rao et al 2015).…”

Section: Introductionmentioning

confidence: 99%

A Pilot Plant Study of Coal Dryer: Simulation and Experiment

Halim

Widyanti

Wahyudi

et al. 2022

ASEAN J. Chem. Eng.

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High moisture content in low-range coal causes low calorific value. To increase the quality, drying by a coal dryer to minimize moisture content is proposed. Here, a case study of a cyclone-like conical tube coal dryer pilot plant was reported. Drying heating uses combustion heat generated from volatile matter combustion. This approach will solve the two problems simultaneously: decreasing moisture content and volatile matter. The computational fluid dynamic (CFD) approach is used to study fluid dynamics inside the coal dryer using ANSYS Fluent 2020R2 software. The CFD simulation results represent the phenomenon of coal drying inside the coal dryer validated by the pilot plant experimental result. The simulation was carried out in steady and unsteady conditions to understand the drying phenomena. The simulation firmly fits the experimental result, especially in an unsteady state system, indicating that the simulation result is promising for further coal dryer design. The optimal condition produces a high moisture content reduction of 86.37%, uniform fluid distribution, and significant volatile matter combustion

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Drying and depolymerization technologies of Zhaotong lignite: A review

Cited by 51 publications

References 69 publications

Moisture removal behaviour of single hard lignite particle during drying and quantitative characterization for its surface damage

Moisture removal behaviour of single hard lignite particle during drying and quantitative characterization for its surface damage

Seashell waste-derived materials for secondary catalytic tar reduction in municipal solid waste gasification

A Pilot Plant Study of Coal Dryer: Simulation and Experiment

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