Theoretically, the diffusion coefficients of both models are inversely proportional to the coal moisture content, possibly because water molecules may occupy the adsorption sites of gas molecules and hinder the diffusion channel. ... High-pressure CH 4 and CO 2 sorption isotherms as a function of coal maturity and the influence of …
Keywords: coal, moisture content, oxidation, coal batch, batch preparation, coking DOI: 10.3103/S1068364X21080056 The moisture content of an undisturbed coal bed is known as the bed moisture content [1]. Usually a coal bed contains considerably more moisture than would correspond to the nature and age of the coal. There-
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 calorific value and moisture-holding capacity of coal from different sources. On
The equilibrated moisture content of the coal is difficult to predict in advance and even a 15% RH atmosphere may result in a zero moisture coal. This work has evaluated the effects of temperature and moisture content on the methane adsorption isotherm of coal from the Waikato Coal Measures, Huntly Coalfield, North Island, New …
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 ... The influences of inherent moisture in Collie coal during pyrolysis has been studied using a series of Collie coal samples, including the raw coal, ...
The influences of moisture content on coal dust explosion behavior had been studied by testing the maximum explosion pressure, the maximum rate of pressure rise and the explosive limit ...
The strength of coke is greatly affected by the elevated and variable moisture content of the coal batch. The moisture content of the batch supplied to coal-preparation shops at coke plants must be no more than 6–7%. Otherwise, the plant must take measures to dry the coal.
The results reveal that the moisture content of low-rank coal is mainly controlled by the content of oxygen elements, followed by the specific surface area …
moisture content were placed in air for different evaporation times to obtain samples with different moisture content. The calculation of moisture content is shown in Eq. 1: M ¼ m 1−m 0 m 0 ð1Þ where M is the water/moisture content,in units of %, m 1 is the sample weight containing water, and m 0 is the dry sample weight (both in units of ...
For economic reasons, it is important to know the moisture and ash content of coal as they do not contribute to the heating value of coal. The calorific value mainly …
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 …
The influence of moisture content on coal deformation and coal permeability during coalbed methane (CBM) production in wet reservoirs April 2020 Journal of Petroleum Exploration and Production ...
Moisture is one of the most important factors that influences coal seepage and coal-bed methane (CBM) extraction. To obtain the water occurrence state and dynamic processes of water change in coal, a series of microscopic observation experiments of Wei Jiagou coal by using field-emission environmental scanning-electron microscopy (ESEM) was …
Through this paper, we comprehensively discuss the composition and chemical structure of coal in detail, and further highlight the coal-moisture interaction …
During this process, the oxygen content decreased from 21.04% of the raw coal to 3.14%, the hydrogen content decreased from 4.52% of the raw coal to 1.19%, and the carbon content increased from 71.97 to 93.68%.
Moisture is one of the most important factors that influences coal seepage and coal-bed methane (CBM) extraction. To obtain the water occurrence state and dynamic processes of water change in coal, a …
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 …
The pressure may affect the porosity and moisture content of the coal [16, 29]. ... Blander M, Sinha S, Pelton A, Eriksson G (1989) Calculations of the influence of additives on coal combustion deposits. Am Chem Soc Div Fuel Chem 34:340–346 (Preprints of papers)
DOI: 10.1016/J.COAL.2008.04.004 Corpus ID: 94700637; Influence of moisture content and temperature on methane adsorption isotherm analysis for coals from a low-rank, biogenically-sourced gas reservoir
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 ...
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% (7% …
Moisture content is a key index of coal quality that influences both the physical and chemical characteristics of coal, and it is required for determining the calorific value and handling properties of …
The moisture content of product coal is a major factor influencing the efficiency of downstream coal utilization processes. Product stockpiles are often used as a control measure to regulate the ...
There are many components in coal, among which water is the intrinsic component. Consequently, it is necessary to investigate the influence of coal moisture content on the mechanical properties of coal. Many scientists have studied the key factor of moisture content [12 – 15]. Yang et al. studied the influence of moisture …
The influences of moisture content on the ignition and explosion processes of coal dust had been studied by testing the lower heat value, explosion severity and explosive limit. Inhibition phenomena of moisture have been confirmed for various dust concentrations and particle size distribution.
The relationship between moisture content and water intrusion time can be expressed as: (4) ω t = 10.96 1 − e − 0.44 t. As shown in Fig. 8, the moisture content increased nonlinearly with exposure time (intrusion time). The process can be divided into three stages: rapidly increasing, slowly increasing, and moisture saturation (stable stage).
To investigate the influences of moisture content on explosion sensitivity, the MEC data of coal dusts with different moisture content were presented in Fig. 7. As expected, the MEC enhances gradually with the rising moisture content, but has different variation trends for fine (No. 1 and No. 2) and coarse (No. 3) dusts.
Influence of dextrin content and sintering temperature on the properties of coal fly ash-based tubular ceramic membrane for flue gas moisture recovery. ... In this paper, coal fly ash-based tubular ceramic membrane for flue gas moisture is prepared using coal fly ash (> 80 wt.%) as raw material, adding dextrin and other additives by …
1. Introduction. As underground coal mining gradually goes deeper, rock burst has become a dynamic disaster seriously threatening the coal mine safety production [1 – 3].As an important index used to measure the possibility of rock burst occurrence, the burst tendency of coal is affected by various factors, among which moisture content is …
AbstractWaterproof coal pillar in the underground reservoir is affected significantly by inclination loads and water erosion. ... Comprehensive understanding of the influence of moisture content and inclination angle on the mechanics properties and microfracture behavior of coal specimens plays an important role for revealing the instability ...
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