Modeling the Vacuum Filtration of Fine Coal. III. Comparison of Models for Predicting Desaturation Kinetics

Condie, D. J.; Hinkel, M.; Veal, Christopher J.; Boissy, K.; Leclerc, D.

doi:10.1081/ss-100100236

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…In addition to the properties in Eqs. (1)-(3), the mathematical dewatering models derived from the classical filtration theory require the irreducible saturation and threshold pressure of the filter cake as inputs [11]. Furthermore, the assumption underlying the conventional theory is that the specific cake resistance and the porosity are functions of applied pressure only.…”

Section: Filtration and Dewatering Of Filter Cakesmentioning

confidence: 99%

Real-time monitoring of the moisture content of filter cakes in vacuum filters by a novel soft sensor

Huttunen

Nygren

Kinnarinen

et al. 2019

Separation and Purification Technology

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The moisture content of filter cakes is probably the most important characteristic that should be kept at a desired level in industrial cake filtration applications to maintain consistent product quality and minimize energy consumption. Most of the currently applied methods for contactless real-time monitoring of the moisture content are based for example on x-ray or microwave techniques, and therefore, the equipment for the purpose is highly specialized. This paper introduces a novel soft sensor for filter cake moisture estimation that uses machine learning algorithms and data collected with basic process instrumentation. The method is primarily based on the cooling effect observed in the cake and air, caused by evaporation of liquid from the cake during the dewatering period, and it can be supported by other process data. The specific energy consumption of vacuum filtration and the subsequent thermal drying to zero moisture is also analyzed. The results of pilot-scale experiments with calcite slurry and a horizontal belt vacuum filter show that in order to minimize the specific energy consumption of vacuum filtration, it is crucial to find the right combination of slurry concentration, vacuum level, and mass of filter cake per unit area. The proposed method for estimating the filter cake moisture content is especially suitable for real-time monitoring and control, enabling also considerable reduction in the energy consumption of the overall process. When applying the proposed soft sensor method in a pilot-scale process, the mean absolute error of the estimated moisture content of the filter cake is ~0.4 percentage points when the temperature of air at the vacuum pump inlet and the vacuum pump air flow rate are included in the input variables.

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Section: Filtration and Dewatering Of Filter Cakesmentioning

confidence: 99%

Real-time monitoring of the moisture content of filter cakes in vacuum filters by a novel soft sensor

Huttunen

Nygren

Kinnarinen

et al. 2019

Separation and Purification Technology

View full text Add to dashboard Cite

show abstract

“…Coal constitutes the primary source of energy in South Africa and is a major contributor to the economy, and therefore improving coal quality will in effect maximize the quantity of usable coal (De Korte and Mangena, 2004). With the use of effective dewatering methods, fine coal can be beneficiated and added to the coarse particle circuits without compromising the quality of the product and hence substantially increasing the overall plant yield (Condie and Veal, 1998). Condie and Veal (1998) suggest that by rule of thumb, for every ton of moisture removed the clean coal product stream is supplemented with about 4 t of fine coal.…”

Section: Introductionmentioning

confidence: 99%

“…With the use of effective dewatering methods, fine coal can be beneficiated and added to the coarse particle circuits without compromising the quality of the product and hence substantially increasing the overall plant yield (Condie and Veal, 1998). Condie and Veal (1998) suggest that by rule of thumb, for every ton of moisture removed the clean coal product stream is supplemented with about 4 t of fine coal. This is a powerful incentive for developing advanced dewatering techniques for fine coal particles.…”

Section: Introductionmentioning

confidence: 99%

“…l l The moisture content of fine coal particles is made up of surface, capillary, and chemically bound moisture (Rong, 1993) as depicted schematically in Figure 1. Free moisture is found on the exterior surface of coal particles (Condie and Veal, 1998), and can be removed by mechanical methods such as filters and centrifugal units. Capillary-bound moisture is absorbed and held tightly within micro-capillaries and micropores of individual coal particles (Rong, 1993).…”

Section: Introductionmentioning

confidence: 99%

“…Capillary-bound moisture is absorbed and held tightly within micro-capillaries and micropores of individual coal particles (Rong, 1993). Removal of this moisture calls for thermal drying techniques for complete drainage (Condie and Veal, 1998). Chemically bound moisture is not included when measuring the total moisture content of the coal (Campbell, 2006), and can be removed only by pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

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