An experimental investigation on the drying kinetics of a single coarse particle of Belchatow lignite in an atmospheric superheated steam condition

Komatsu, Yosuke; Ściążko, Anna; Zakrzewski, Marcin; Kimijima, Shinji; Hashimoto, Akira; Kaneko, Shozo; Szmyd, Janusz S.

doi:10.1016/j.fuproc.2014.12.005

Cited by 45 publications

(50 citation statements)

References 21 publications

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“…Pores, in which water is kept in the sample, become vacant after the water removal and they are crushed due to thermal stress mostly in the DDRP at which the sample's surface and core temperatures start increasing from the saturation temperature to the test temperature. This behavior was previously shown [18]. The water transported from the inside sample to the shell at the CDRP might occur not as vapor, but in the form of liquid.…”

Section: Methodssupporting

confidence: 71%

“…The drying rate curve plot, at each test temperature of 110, 130, 150 and 170 °C, is also summarized in Figure 10. The clearly visible influence of the particle size and superheated steam temperature was explained in previous work [18], but the additional variety from individual properties of coal is observed. Because of the diversification of the petrographic lithotype texture, it is very difficult to determine the representative characteristics of drying behavior for each case.…”

Section: Methodsmentioning

confidence: 49%

“…Shi et al [15] have investigated the drying behavior of Pongzhuang lignite excavated in China. The research group of the authors of the present paper carried unique experimentation for studying the drying characteristics of Loy Yang (Australia) and Belchatow (Poland) lignite [16][17][18]. Thanks to those distinct works, it is clearly observed that the individual drying behavior vary significantly among different types of lignite.…”

Section: Introductionmentioning

confidence: 86%

“…The detailed derivation and a method estimating the heat transfer coefficient are presented in [18]. This coefficient described by the flow velocity, the size of particle and test temperature.…”

Section: Thermodynamic Evaluation Of the Drying Rate At Constant Dryimentioning

confidence: 99%

“…As the thermodynamic evaluation has been previously carried out and verified for lignite from the Belchatow deposit, the initial drying rate (the drying rate at the CDRP) (s´1) can be derived from the following equation [18]:…”

Section: Thermodynamic Evaluation Of the Drying Rate At Constant Dryimentioning

confidence: 99%

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Experimental Attempts to Investigate the Influence of Petrographic Properties on Drying Characteristics of Lignite in Superheated Steam Atmosphere

et al. 2016

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A superheated steam fluidized bed dryer (SSFBD) in a self-heat recuperative configuration has a great potential of improving thermal efficiency of a lignite-fired power plant by recovering both of latent heat of vaporization of water kept in the fuel and part of sensible heat during the fuel processing. However, the optimal design of the dryer requires the fundamental knowledge of drying characteristics in respect to the individual properties of the utilized fuel. Experimental investigation to determine the correlation between a specific coal properties originated from geological background and its drying characteristics is thus the major concern in this paper. The investigated lignite is a representative of Turoszow deposit in Poland. Experimental attempts unveiling drying kinetics were carried out for 5 mm and 10 mm diameter spherical samples in the superheated steam atmosphere in the temperature range of 110˝C-170˝C. Simultaneous and continuous measurements of changes in weight, surface and interior temperatures and appearance on each tested sample were carried out for describing drying behavior. Analytical investigation was applied to explain the drying characteristics, which are strongly affected by the individual properties of coal and the inherent ash composition.

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Section: Methodssupporting

confidence: 71%

Section: Methodsmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 86%

Section: Thermodynamic Evaluation Of the Drying Rate At Constant Dryimentioning

confidence: 99%

Section: Thermodynamic Evaluation Of the Drying Rate At Constant Dryimentioning

confidence: 99%

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Experimental Attempts to Investigate the Influence of Petrographic Properties on Drying Characteristics of Lignite in Superheated Steam Atmosphere

et al. 2016

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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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Towards the improvement of thermal efficiency in lignite-fired power generation: Concerning the utilization of Polish lignite deposits in state-of-the-art IGCC technology

Komatsu

Ściążko

Zakrzewski

et al. 2016

Int. J. Energy Res.

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SUMMARYIntegrated coal Gasification Combined Cycle (IGCC) is the most advanced technology for coal-fired power generation. The two-stage entrained flow gasification process allows for the use of a wide range of coal, as long as the gasification temperature is above the ash melting point of a used fuel. In this gasification technology, lignite, which often has a low ash melting point, can be preferably utilized. However, ash fluidity is also another importance, because the behaviour of molten slag can diminish a stable ash discharge from a gasifier. As the eligibility of coal ash properties is a considerable factor, water physically and chemically kept in lignite (30 -60% in mass) attributes to deteriorating gasification efficiency, because it causes significant heat loss and increasing oxygen consumption. Developing a thermal evaporative lignite drying method will be a necessary attempt to apply lignite to the coal gasification process. For those preceded objectives, coal and ash properties and drying characteristics of several grades of Polish lignite, extracted from Belchatow and Turow deposits, have been experimentally investigated in a preliminary study evaluating the applicability and consideration for its utilization in state-ofthe-art clean coal technology, IGCC. This paper particularly discusses the eligibility of Polish lignite from the perspective of the fusibility and fluidity of ash melts and the fundamental drying kinetics of lignite in superheated steam in the light of water removal. The viscosity of ash melts is measured at high temperature up to 1700°C. In the drying tests, the significant influence of structural issues, because of the provenance and origin of lignite on the drying characteristics, was found by applying the method of sensitivity analysis of physical propensity. This paper concludes that the investigated Polish lignite has characteristics favourable for utilization in IGCC technology, once the precautions related to its high moisture have been carefully addressed.

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An experimental investigation on the drying kinetics of a single coarse particle of Belchatow lignite in an atmospheric superheated steam condition

Cited by 45 publications

References 21 publications

Experimental Attempts to Investigate the Influence of Petrographic Properties on Drying Characteristics of Lignite in Superheated Steam Atmosphere

Experimental Attempts to Investigate the Influence of Petrographic Properties on Drying Characteristics of Lignite in Superheated Steam Atmosphere

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

Towards the improvement of thermal efficiency in lignite-fired power generation: Concerning the utilization of Polish lignite deposits in state-of-the-art IGCC technology

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