“…Therefore, an attempt was made to measure the equilibrium moisture content of each sample as a function of relative humidity. However, to ease the experimental tasks, first the reliability of eq 1 was tested against the equilibrium moisture data of coal obtained by Glanvile et al . and Nordon and Bainbridge .…”
Section: Methodsmentioning
confidence: 99%
“… 2 Comparison of the predicted (using eq 1) and experimental equilibrium moisture contents at 25 °C for different relative humidities. Data from (·) Glanville et al, (□) Nordon and Bainbridge …”
An investigation was carried out on the adsorption and desorption of moisture in chars of lowrank coal. Equilibrium moisture sorptions of dry and moist chars were measured at room temperature and at a relative humidity of 30% and 80%. On the basis of these measurements, a simple mathematical model was developed to predict both the rate and the level of hydration for coals and chars. The formulation uses a shrinking core model which required only the measurement of the adsorbing material's equilibrium moisture content at different temperatures and humidities. The model was validated against experimental and literature data. It accurately and reliably predicted both the rate and extent of hydration and dehydration for coals and char. Using this model, the effects of varying temperatures, relative humidities, and size of the particles and coal pile were simulated. The sensitivity study demonstrated that, as expected, relative humidity and temperature had strong effects on both the rate of hydration and the equilibrium moisture of coal or char. The particle size dramatically influenced the rate of hydration but had no affect on the equilibrium moisture content. This model can be used effectively to simulate the impact of moisture on drying, storage, and spontaneous combustion of coals and coal-derived chars.
“…Therefore, an attempt was made to measure the equilibrium moisture content of each sample as a function of relative humidity. However, to ease the experimental tasks, first the reliability of eq 1 was tested against the equilibrium moisture data of coal obtained by Glanvile et al . and Nordon and Bainbridge .…”
Section: Methodsmentioning
confidence: 99%
“… 2 Comparison of the predicted (using eq 1) and experimental equilibrium moisture contents at 25 °C for different relative humidities. Data from (·) Glanville et al, (□) Nordon and Bainbridge …”
An investigation was carried out on the adsorption and desorption of moisture in chars of lowrank coal. Equilibrium moisture sorptions of dry and moist chars were measured at room temperature and at a relative humidity of 30% and 80%. On the basis of these measurements, a simple mathematical model was developed to predict both the rate and the level of hydration for coals and chars. The formulation uses a shrinking core model which required only the measurement of the adsorbing material's equilibrium moisture content at different temperatures and humidities. The model was validated against experimental and literature data. It accurately and reliably predicted both the rate and extent of hydration and dehydration for coals and char. Using this model, the effects of varying temperatures, relative humidities, and size of the particles and coal pile were simulated. The sensitivity study demonstrated that, as expected, relative humidity and temperature had strong effects on both the rate of hydration and the equilibrium moisture of coal or char. The particle size dramatically influenced the rate of hydration but had no affect on the equilibrium moisture content. This model can be used effectively to simulate the impact of moisture on drying, storage, and spontaneous combustion of coals and coal-derived chars.
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