Pressurised steam drying of Australian low-rank coals

Bongers, Geoff; Jackson, W. Roy; Woskoboenko, Fedir

doi:10.1016/s0378-3820(98)00066-6

Cited by 38 publications

(12 citation statements)

References 14 publications

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“…Fluidized bed dryers using steam or hot gas as the heating (and fluidizing) medium are widely applicable for lignite drying and have attracted a number of researchers. The basic principles of lignite drying in a fluidized bed are currently being studied [13][14][15][16][17][18][19] through theoretical and experimental methods. The steam equilibrium moisture content of coals is related to the degree of superheat by a simple equation by Bongers et al [13] ; they also investigated the shrinkage of brown coal during high pressure steam drying and the physical structure of the product.…”

Section: Pre-dried Lignite-fired Power System Rotary-tube Dryermentioning

confidence: 99%

“…The basic principles of lignite drying in a fluidized bed are currently being studied [13][14][15][16][17][18][19] through theoretical and experimental methods. The steam equilibrium moisture content of coals is related to the degree of superheat by a simple equation by Bongers et al [13] ; they also investigated the shrinkage of brown coal during high pressure steam drying and the physical structure of the product. [14] Chen et al [15,16] developed a single-particle model and the operation of a fluidized bed drying unit model for steam fluidized bed drying of coal.…”

Section: Pre-dried Lignite-fired Power System Rotary-tube Dryermentioning

confidence: 99%

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Theoretical Study and Case Analysis for a Predried Lignite-Fired Power System

et al. 2011

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Lignite is a type of low-rank coal, which is uneconomically transported over long distances and does not efficiently generate electricity. As a result, lignite utilization and application is very limited; lignite is mainly used as a low-level fuel that generates electricity inefficiently and can be distributed only in areas near lignite mines. With increasing requirements in efficiency and environmental protection, studying a new lignite-fired power system to improve the efficiency of direct lignite-fired power plants is very important. A rotary-tube dryer is mature drying equipment used in a pre-dried lignite-fired power system (PLPS). However, a comprehensive model approach on the influence of PLPS parameters on power generation efficiency and optimization has not been previously investigated. In the current paper, a PLPS theoretical model was developed based on basic thermal principles, and a case analysis was performed using this model as the theoretical foundation. Parameter influence was also calculated and analyzed. Results show that the PLPS theoretical model can evidently increase the efficiency of a conventional lignite-fired power system (CLPS) by approximately 1.87% when the condensate is sent to the de-aerator, and by 1.72% when the condensate is sent to the condenser at the calculation benchmark condition listed in this paper.

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Section: Pre-dried Lignite-fired Power System Rotary-tube Dryermentioning

confidence: 99%

Section: Pre-dried Lignite-fired Power System Rotary-tube Dryermentioning

confidence: 99%

Theoretical Study and Case Analysis for a Predried Lignite-Fired Power System

et al. 2011

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“…Many benefits are associated with SSD which include, (a) reduced risk of spontaneous combustion [50,51], (b) increased drying rates, (c) better energy efficiency and finally improved grindability [17,52]. More benefits and limitations of SSD are summarized in Table 3.…”

Section: Elsevier_jfue_9131mentioning

confidence: 99%

Report on comparison among current industrial scale lignite drying technologies (A critical review of current technologies)

Νikolopoulos

Violidakis

Karampinis

et al. 2015

Fuel

106

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“…Because it is possible to recover all of the latent heat supplied in the super-heated steam drying from the exhaust by condensing the exhaust stream, reduced energy consumption is a clear advantage of super-heated steam drying. The degree of moisture removal of lignite as a function of both temperature and superheat was studied by Bongers et al [2]. They also studied the shrinkage and physical properties of lignite during high pressure steam drying [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Super-Heated Steam Drying of Lignite

Shi

et al. 2011

AMR

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Abstract. This paper applies super-heated steam drying technology to improve the quality of lignite. A unique experimental system was built up. In order to obtain the optimum operation conditions, the drying kinetics was measured. The temperature range of super-heated steam was from 120 to 200˚C. The results showed that the drying process of super-heated steam drying of lignite can be well depicted by two stages, as a constant drying rate stage followed by a falling drying rate stage. The comparison of drying process to the hot air drying showed the superior advantages of super-heated steam drying on safety, drying capacity and energy conservation. Analysis shows the huge application potential of lignite in power plants by means of the super-heated steam drying.

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Pressurised steam drying of Australian low-rank coals

Cited by 38 publications

References 14 publications

Theoretical Study and Case Analysis for a Predried Lignite-Fired Power System

Theoretical Study and Case Analysis for a Predried Lignite-Fired Power System

Report on comparison among current industrial scale lignite drying technologies (A critical review of current technologies)

Experimental Study on Super-Heated Steam Drying of Lignite

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