The influence of the moisture content on the ignition and combustion characteristics of lignite single particles was studied using an ignition model of single coal particles with moisture and ...
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Moisture affected the CH 4-induced swelling and shrinkage capacity of coal, mainly in three ways: the reduction of the adsorption/desorption capacity of coal, a …
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Excessive coal moisture leads to a lower heating value and power plant efficiency, and increased transportation costs. Therefore, coal stockpile management and moisture control are particularly important in …
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Based on the relevance of bound water content and its influencing factors, moisture occurrence in coal reservoirs of different ranks is revealed by SPSS statistical methods. The moisture content of low-rank coal is mainly controlled by elemental oxygen and specific surface area, whereas for medium- and high-rank coals, this is controlled …
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DOI: 10.1016/J.ENGGEO.2019.105156 Corpus ID: 182508535; Influence of moisture on crack propagation in coal and its failure modes @article{Yao2019InfluenceOM, title={Influence of moisture on crack propagation in coal and its failure modes}, author={Qiang-ling Yao and Tian Chen and Chuanjin Tang and Majid Sedighi and …
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Moisture also influences the handling characteristics. By integrating MoistTech's CCS3000 into the process, users are able to monitor of their product quality, instantly and consistently. Measuring moisture throughout processing will produce coal at a specific moisture percentage preventing the out of specification when the …
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The moisture content adsorbed on the coal matrix influences the gas storage and gas flow characteristics in wet coal reservoirs. This study shows that the …
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the critical moisture content of frost heaving in gas-containing coal. The results showed that the coal sample can be divided into three stages during the cooling process: the cold shrinkage stage, frost heave stage, and stabilization stage. When the moisture content is greater than 7%, as the moisture content increases, the amount of ice ...
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The equilibrium moisture content of coals can be obtained at a temperature of 30 °C and a relative humidity (RH) of 96% (ASTM, 1975). And it is known as the maximum inherent moisture, which reflects the water-holding capacity of coal (Liu et al., 2015). The inherent moisture content of coal varies with different relative humidity (RH ...
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The gas content and permeability of coal reservoirs are the main factors affecting the productivity of coalbed methane. To explore the law of gas content and permeability of coal reservoirs in the ...
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Properties of Coal • Coal properties are evaluated by different methods. • The most commonly used methods are Proximate and Ultimate analysis of the coal. • Proximate analysis gives the Moisture, Ash and Volatile matter, while the Fixed Carbon is found by difference. • Ultimate Analysis gives the elemental composition of the coal. • Other …
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exaggerating to conclude with reputable estimates that Mexico has relatively low coal reserves (1.21Gt, 0.1% of World total), of which about 860 Mt are bituminous coal with …
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because the high moisture content in the coal sample leads to an internal crack closure and tremendous friction Table 1: Mechanical parameters of some coal samples. Preloading condition No. Moisture content Preloading condition No. Moisture content Uniaxial compression test a1 16% Loading/unloading test b1 16% a2 17% b2 …
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and then decreased. When the forming moisture content of briquettes is between 6% and 12%, the axial stress reaches the maximum. Before the molding moisture content reaches 9%, coal particles are gradually moistened by moisture with the increased moisture. At this time, the moist coal particles
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The moisture content of low-rank coal is one of the most critical properties in coal-fired power plant operation (Luo, Zhang, and Chen 2017; Phiciato and Yaskuri 2019; Yu et al. 2013). ... The influences of moisture on particle ignition behavior of Chinese and Indonesian lignite coals in hot air flow. Fuel Processing Technology …
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Analysis of the composition, structure, and properties of 63 samples of Ukrainian, Russian, and United States coal clarifies their influence on the gross calorific value in the wet and dry ash-free states and the maximum moisture content. Quantitative formulas are obtained for the influence of the petrographic characteristics on the gross …
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Due to the high moisture in the mine, the moisture content of the fresh coal sample (Marked as Coal C: M = 9.4%) is close to the critical moisture value. The fresh coal sample was dried at 105 °C under nitrogen to obtain coal samples A and B, with a moisture content of 2.8 % and 6.6% (Marked as Coal A: M = 2.8%, Coal B: M = …
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1. Introduction. Moisture in coal can exist in various forms, and understanding these types of moisture is crucial in the coal industry, as it can affect the properties and performance of coal [Neavel et al. (1986); Sowerby (1984); Kirchner (1991); Nadkarni (1980); Speight (2005); Andrés et al. (2004); Nalbandian (2005)].The main types of moisture in coal …
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3.1.3 Volatile Matter and Fixed Carbon in Coal 3.1.3.1 Volatile Matter. The yield of volatile organic substances after heating coal isolated from the air under specified conditions is referred to as the volatile matter (V).The volatiles generated from coal under such conditions include the gaseous products from pyrolysis of organic matter in coal, …
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moisture range of long-flame coal is 3–12%, whereas the moisture in anthracite is lower (Tang et al. 2015; Wang et al. 2014a; Yu and Cheng 2012). The presence of different inherent moistures will occupy the gas adsorption sites of coal and the channel of gas migration and diffusion, which determines the coal gas content and outburst risk (Beam-
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Correlation analysis reveals that changes in CTN, Nthroat, and Lthroat significantly influence moisture parameter variations, with most pore parameter …
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Moisture absorbs heat, so high moisture content in coal reduces the relative efficiency of heating when a coal is combusted. This is why low-rank, high-moisture coals have lower calorific values (Btu/lb) …
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Correlation analysis reveals that changes in CTN, Nthroat, and Lthroat significantly influence moisture parameter variations, with most pore parameter changes affecting saturated hydraulic conductivity. ... The results showed that the coal-derived carbon content (the amount of coal-derived carbon per unit mass of dried soil) was 7% …
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The experimental results show that moisture content in coal has greater effect on the adsorption capacity of CH4 than that of CO2. ... which indicates that the influence of moisture content on CH ...
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High moisture content affecting coal bed methane (CBM) occurrence and transport is a typical feature of low-rank coal (LRC). ... On this basis, the influence of moisture on low-rank coal bed ...
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Its proximate and ultimate analysis (wt%) are listed in Table 1. Due to the high moisture in the mine, the moisture content of the fresh coal sample (Marked as Coal C: M = 9.4%) is close to the critical moisture value. The fresh coal sample was dried at 105 °C under nitrogen to obtain coal samples A and B, with. Coal dehydration process
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A linear equation was found to better characterize the influence of moisture on gas content in Shanxi gas-fat coal, represented by the formula η = 1/(1 + 1.98078w), where, η represents the ...
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Understanding of effects of water on crack propagation and crack failure modes of coal is important to determine the required width of the coal pillars in underground reservoirs and calculate the area of fractured zones containing flowing water. In this paper, we apply acoustic emission (AE) techniques, X-ray diffraction (XRD), scanning electron …
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In this study, following the characterization of pore properties by MIP, N 2 GA and NMR experiments, the moisture content characteristics of coal reservoirs are …
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PDF | On Nov 11, 2020, Nuraini A.A. and others published Effect of Coal with High Moisture Content on Boiler Operation Parameters at Thermal Coal Fired Power Plant | Find, read and cite all the ...
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While permeability is a significant parameter to assess flow characteristics and can be influenced by many factors such as the stress field, geothermal field, geoelectric field, acoustic field, pore pressure and coal moisture content. 15–20 Numerous achievements about a seepage model have been obtained at home and …
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moisture content of coal will repress the occurrence of AE events [30–32], and meanwhile, the load-carrying induced failure of moisture-containing coal-rock mass is
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The original moisture content of coal samples selected for the mechanical tests of this research coal type ranged from 1.74 to 1.96%, with an average moisture content of 1.81%. Physical property parameters of coal samples were obtained by measuring the industrial composition of coal samples, as shown in Table 1 .
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DOI: 10.1016/J.FUPROC.2015.07.008 Corpus ID: 93907167; Influence of inherent moisture on the ignition and combustion of wet Victorian brown coal in air-firing and oxy-fuel modes: Part 1: The volatile ignition and flame propagation
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Moisture content in straw had a negative effect on PAH formation, especially on PAHs with low molecular weight. ∑PAHs emission amounts decreased by 78.2% for bean straw with a moisture content ...
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Through this paper, we comprehensively discuss the composition and chemical structure of coal in detail, and further highlight the coal-moisture interaction …
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However, due to the difference in the internal pore structure of different coal specimens, the moisture content of coal specimens after reaching the immersion time is slightly different from the set value. The average moisture content of the actual prepared coal specimens was 2.42%, 5.53%, 7.55%, and 10.08%, respectively.
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