Drying characteristics and kinetics analyses for Yimin lignite at various temperatures

Liu, Rongtang; Liu, Ming; Han, Xinyan; Yan, Junjie

doi:10.1080/07373937.2020.1729174

Cited by 15 publications

(4 citation statements)

References 47 publications

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“…To ensure high-intensity drying of iron (II) sulfate heptahydrate, it is necessary to study the influence of the process parameters (rate of filtration of the thermal agent), the geometric dimensions of the layer on the nature of the change in moisture content over time [30]. Generalization of the results of the kinetics of drying and determination of kinetic coefficients will allow calculating the main dimensions of the drying unit, substantiating the optimal technological parameters of the process, depending on the required productivity [31,32]. Despite the fact that there is practically no information in the literature on the kinetic regularities of drying of iron (II) sulfate heptahydrate during the implementation of the process by the filtration method, the goal of the work is formulated.…”

Section: Proposed Solution To the Problemmentioning

confidence: 99%

Study of the Kinetics of Drying Iron (Ii) Sulfate Heptahydrate by Filtration Method

Tsiura

Кіндзера

Huzova

et al. 2021

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The object of research: kinetics of filtration drying process of iron (II) sulfate heptahydrate. Solved problem: to obtain the calculated dependence of the kinetics of filtration drying, which predicts the nature of the change in the moisture content of the material in time during the period of complete saturation of the thermal agent with moisture in the range of heights of the material layer 30.10-3–120.10-3 m and the speeds of the thermal agent 0.46–1.61 m/s. Main scientific results: The kinetics of filtration drying of iron (II) sulfate heptahydrate was investigated at different heights of the material layer and pressure drops over dry material, which means at different speeds of movement of the thermal agent. A certain critical moisture content, which is Wcr=0.065 kg H2O/kg dry mat and the time it reaches at different heights of the material layer and the speeds of movement of the thermal agent. Based on the solution of the system of differential equations of material balance in the layer and the kinetics of drying, the kinetic coefficients for iron (II) sulfate heptahydrate a=15.75 1/m, α=3.03.10-3 1/s were determined, which made it possible to obtain the calculated dependence of the kinetics drying, which predicts the nature of the change in the moisture content of the material over time during the period of complete saturation of the thermal agent with moisture in the range of heights of the material layer H=30.10-3–120.10-3 m and the velocities of the thermal agent υ=0.46–1.61 m/s. The area of practical application of the results: enterprises for the production of titanium (IV) oxide with the production of iron (II) sulfate heptahydrate as a by-product and enterprises specializing in the manufacture of pigments based on iron (II) sulfate heptahydrate. Innovative technological product: iron (II) sulfate tetrahydrate (FeSO4•4H2O, rosenite), obtained as a result of drying by the filtration method. Scope of application of the innovative technological product: in the production technology of iron oxide pigments.

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Section: Proposed Solution To the Problemmentioning

confidence: 99%

Study of the Kinetics of Drying Iron (Ii) Sulfate Heptahydrate by Filtration Method

Tsiura

Кіндзера

Huzova

et al. 2021

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“…Notably, low-temperature solid heat carrier pyrolysis technology (DG process) is an economical and efficient alternative, compared with traditional coal gasification and liquidation. However, lignite is inherently moisture-enriched (moisture content = 20%–60%) and adversely affects the low-temperature pyrolysis efficiency. , Thus, achieving a technological breakthrough in lignite predrying is critical before implementing low-temperature pyrolysis …”

Section: Introductionmentioning

confidence: 99%

“…3,4 Thus, achieving a technological breakthrough in lignite predrying is critical before implementing low-temperature pyrolysis. 5 Pneumatic dryers are a conventional drying method that offers the benefits of a simple structure and low cost, making them widely used in various industrial applications. 6,7 Previous studies have shown that gas and particle flow rates have a significant impact on the performance of pneumatic dryers, particularly when used as a predryer in a PVC suspension production line.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Cross-Domain Hydrodynamics in an Integrated Pneumatic-Spouted Bed

Jiao

Wang

Mei

et al. 2023

Ind. Eng. Chem. Res.

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As an essential resource, the drying, upgrading, and efficient utilization of lignite are of great significance to the development of the low-carbon economy. In this work, a novel drying system, combining a pneumatic and spouted bed, is designed to achieve lignite deeply dewatering. The system is investigated experimentally and numerical simulated to characterize the hydrodynamics of particles moving across the domain, such as pressure drop, fountain height, and pressure fluctuation. The results show that there is a critical gas velocity that changes the flow pattern of the bed when the static bed is higher than 50 mm. When the gas velocity increases to the critical value, the spouting state becomes unstable and the corresponding pressure drop will undergo a secondary mutation. This work provides a deeper understanding of the flow structure and particle motion in the novel drying system under various industrial operating conditions.

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“…. Yimin lignite has the characteristics of high moisture, high volatility, low calorific value, large porosity, spontaneous combustion, easy weathering and fragmentation, easy oxidation, etc. − If these properties of lignite can be comprehensively utilized, it will create a higher economic value and reduce environmental pollution . At present, the pyrolysis of coal is a key step in the classification process, widely used in coal gasification, liquefaction, combustion, and carbonization. − In China, how to reasonably use coal resources and economically and effectively improve coal utilization technology is particularly important. − Yimin lignite is one of the typical coals suitable for pyrolysis conversion. , During the pyrolysis process, the composition and structure of lignite changes, and the products include tar, combustible gas, and char products. , Research in recent years has shown that char can be used as a new type of tar cracking catalyst or catalyst carrier.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Distribution of Yimin Lignite Pyrolysis Products and the Stability of its Char

et al. 2021

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This paper introduces the utilization of lignite in China and abroad and studies the influence of different process conditions on the pyrolysis products of lignite. The effects of pyrolysis temperature, residence time, and heating rate on the yield and stability of pyrolysis products were studied by standard lattice low-temperature distillation of coal. The results showed that the final pyrolysis temperature of lignite increases gradually, which is a key factor affecting the pyrolysis performance of lignite. At the same time, the combustible gas yield and tar yield were also significantly improved. Semichar yield and semichar volatile content showed a downward trend. From the range of pyrolysis products, the heating rate also has an important influence on the pyrolysis performance of lignite. Through the thermal stability test of lignite, it is concluded that the particle size distribution of carbon black products is not significantly different, and most of the coal particles are mainly distributed in the range of more than 6 mm.

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Drying characteristics and kinetics analyses for Yimin lignite at various temperatures

Cited by 15 publications

References 47 publications

Study of the Kinetics of Drying Iron (Ii) Sulfate Heptahydrate by Filtration Method

Study of the Kinetics of Drying Iron (Ii) Sulfate Heptahydrate by Filtration Method

Experimental and Numerical Study of Cross-Domain Hydrodynamics in an Integrated Pneumatic-Spouted Bed

Investigation on the Distribution of Yimin Lignite Pyrolysis Products and the Stability of its Char

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