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Comparative kinetic study of coal gasification with steam and CO2 in molten blast furnace slags. Korean Journal of Chemical Engineering 2018, 35 (8), 1626-1635.
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T1 - The effect of coal particle size on pyrolysis and steam gasification. AU - Hanson, S. AU - Patrick, J. W. AU - Walker, A. PY - 2002/3. Y1 - 2002/3. N2 - For future power generation from coal, one preferred option in the UK is the air-blown gasification cycle (ABGC). In this system coal particles sized up to 3mm, perhaps up to 6mm in a ...
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Though the amount of brown coal resources in the world is abundant, and its moisture content is often high (more than 30%, wet basis). Thus, fluidized bed drying systems, using superheated steam for fluidizing gas, has been developed as a large capacity and low energy consumption drying technology. ... However, particle …
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1. Introduction. Char gasification is an important stage during the thermochemical conversion of solid fuels (e.g., coal and biomass). To improve the gasification efficiency, steam or CO 2 are usually added into the gasifying agent in industrial applications like fluidized-bed and entrained-flow reactors [1, 2].Taking biomass for …
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Char gasification is affected by operating conditions such as reaction temperature, reactant gas partial pressure, total system pressure, and particle size, in addition to the chemical …
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The results indicate that the decrease of the particle size, heating rate, and the total flow rate result in lower ignition and burnout temperatures. ... Na, Y.J., Lu, Q.G. Thermogravimetric analysis of gasification reactivity of coal chars with steam and CO 2 at moderate temperatures. Journal of Thermal Analysis and Calorimetry. 2012; 113:599 ...
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DOI: 10.1016/J.ENERGY.2018.12.216 Corpus ID: 117248330; Influence of particle sizes on combustion characteristics of coal particles in oxygen-deficient atmosphere @article{Cong2019InfluenceOP, title={Influence of particle sizes on combustion characteristics of coal particles in oxygen-deficient atmosphere}, …
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In addition, the ash content of the most of the steam coal decreased with the particle size in China. Therefore, the −3 mm dry screening of raw coal plays an important role in the large-scale, efficient, and clean utilization of steam coal [16, 17].
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Preliminary TGA experiments indicated that diffusion restrictions exist for Morwell coal char above a size range of 75–90 μm. Therefore, a series of duplicate preparations and experiments were also performed using 38–53 μm char in order to determine the effect of particle size on gasification kinetics at small, narrow particle …
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The results of pyrolysis of coal particles with size ranging from 2 to 14 mm in a bubbling fluidized bed are presented in this paper. The investigation is focused on the …
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According to the ASTM International (previously known as American Society for Testing and Materials) coal classification (A. Standard, "D388-05 in Classification of …
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For coal, the inversion temperature exhibits a minimum as gas flow rate and particle size increase; it decreases steadily with the increase of coal permeability. Acknowledgements The authors would like to thank the National Science Foundation (OSR-955047) and the Department of Energy (DE-FC02-91ER75680) for financial support of …
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The feed coal (40 g) with a particle size of 5–13 mm (the particle size range of coal used in the gasification site is 5–50 mm) was put into the pressurized fixed-bed gasifier and heated to 1100 °C with a rate of 10 °C/min at 4 MPa, and Al 2 O 3 porcelain balls were placed underneath and on the coal samples. The gasification agent mixture ...
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DOI: 10.1016/j.fuel.2023.129596 Corpus ID: 261218259; Effects of dust concentration, particle size, and crude oil concentration on the explosion characteristics of oil-immersed coal dust
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In this system coal particles sized up to 3 mm, perhaps up to 6 mm in a commercial plant, are pyrolysed and then gasified in air/steam in a spouted bed reactor. This provides gas to be burnt in a gas turbine, and char which is burnt in a circulating …
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In PC combustion, the coal is dried and is ground to a specified fineness, with a maximum particle size of 250–300 μm, depending on the reactivity of the coal. Coal preparation, which involves feeding, drying, and grinding of the coal, and the pneumatic transport of the pulverized coal to the burners, is fully integrated with the boiler.
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Char gasification is affected by operating conditions such as reaction temperature, reactant gas partial pressure, total system pressure, and particle size, in addition to the chemical composition and the physical structure of the coal. We characterized the effects of coal type and particle size on the CO2 gasification of chars prepared from 12 bituminous …
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Additionally, the ways in which some factors such as coal particle size, heating temperature etc. influence the fragmentation has been extensively investigated previously [7, 17, 24]. ... The effect of coal particle size on pyrolysis and steam gasification. Fuel, 81 (2002), pp. 531-537, 10.1016/S0016-2361(01)00153-3.
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Made available by U.S. Department of Energy Office of Scientific and Technical Information ...
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The size of coal particles in the experiments did not exceed 60 μm, and of the wood - 5 mm. It has been established that in such a fuel system one of the fuel components of the coal particle is "conducting" (or leading), and the second is "conducted" in the reaction of the thermochemical response of the fuel mixture with air oxygen.
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This work aims to numerically investigate characteristics of Na under Oxy-steam atmosphere, mainly related to temperature, steam concentration, particle size and modification methods of kaolinite. Results indicated that the high temperature promoted the release of Na: compared with 750 °C, the Na content in ash at 950 °C has dropped by …
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The characteristic of coal combustion is marked by the multi-phase reaction of coal char particle [10].As shown in Fig. 1, coal char particles are completely consumed by O 2, H 2 O and CO 2 through two steps. At first, the carbon particles are oxidized and gasified as unburned gases (H 2, CO, CO 2), and then the reductive gases (CO and H …
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Gas (i.e. methane and CO 2) ad-/desorption characteristics are essential for unconventional gas production, and they are related to many factors such as coal particle size, adsorption pressure, external moisture and heat.In order to investigate the effect of these factors, as well as those arising from pressured water and superheated steam on …
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Plasma gasification is widely applied because of its clean syngas production performance and high chemical reactivity accelerated by the free radicals produced by …
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Yoon et al. [24, 25] studied the effect of oxygen, steam and coal particle size on the syngas production by microwave plasma gasification of four kinds of coal. Djebabra et al. [26] studied the ...
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Characterizing the coal particle size distribution is an effective means to reduce potential safety hazards in smart mine construction for disaster prevention and security management. Aiming at the existing approach, pixelwise manual labeling on low-contrast particle images that have irregular contours is challenging and time consuming. …
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According to the ASTM International (previously known as American Society for Testing and Materials) coal classification (A. Standard, "D388-05 in Classification of Coals by Rank, ASTM International, West Conshohocken, PA, 2005), there are four coal groups and three ranks, based on coal's calorific value, volatile matter and fixed carbon …
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SE directly affects the composition and physical properties of coal, such as density [4], particle size, porosity [5], and moisture reabsorption capacity [6]. In the case of lignite, …
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SE directly affects the composition and physical properties of coal, such as density [4], particle size, porosity [5], and moisture reabsorption capacity [6]. In the case of lignite, SE treatment engenders an augmented count of mesopores within the 6–12 nm range, reshaping its adsorption behavior significantly [7].
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An experimental and modeling study of heating rate and particle size effects in bituminous coal pyrolysis. Thomas P. Griffin, Jack B. Howard, and ; William A. Peters; Cite this: …
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