Mechanical/thermal dewatering of lignite. Part 4: Physico-chemical properties and pore structure during an acid treatment within the MTE process

Vogt, Christian; Wild, Thomas; Bergins, Christian; Strauß, Karl; Hulston, Janine; Chaffee, Alan L.

doi:10.1016/j.fuel.2011.08.049

Cited by 55 publications

(25 citation statements)

References 16 publications

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“…Above a RWC of 44%, the EWCs at RH = 96% is substantially lower than the RWCs. Similar results have also been reported by Vogt et al 1) . Compared with the previous works 1, 3) , we extended the ranges of RWC and RH, and found that the relationships between RWC and EWC below a RWC of 5%, within a threshold residual water level (ca.…”

Section: Effect Of Rwc On Ewc At Various Rhssupporting

confidence: 92%

“…Lignite contains abundant oxygen-containing functional groups and is highly porous, leading to it not only having high water content but also containing various types of water [1][2][3][4] . Now, lignite is mainly used for electricity generation at power station located at or near a mine mainly because of its disadvantage of high water content, which decreases the ef ciency of transportation, storage, and utilization of lignite 4,5) .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Hydrothermal Treatment Coupled with Mechanical Compression on Equilibrium Water Content of Loy Yang Lignite and Mechanism

et al. 2016

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Measurements of equilibrium water contents (EWCs) in samples obtained from hydrothermal treatment (HT) and HT coupled with mechanical compression (HT-MC) were undertaken across a range of relative humidities (RHs) to investigate the performance of EWC and its mechanism. The changes in the concentrations of carboxyl groups and mesopore volume were measured by an improved barium ion exchange and N 2 adsorption-desorption isotherms methods, respectively. The results showed that EWCs decreased with progressively severe HT and HT-MC conditions and EWCs of HT-MC samples were lower than those of HT samples, indicating that HT and HT-MC can upgrade lignite by reducing water loading capacity and HT-MC was better than HT. At low RHs (RH ≤ 10%), the factor that controls EWC is water moleculesactive sites interactions and one to two water molecules are associated with each carboxyl group, while at medium RHs (10 < RH ≤ 92%) the amount of monolayer water and mesopore volume gain in signi cance and ca. two multilayer water molecules are bound to each monolayer water molecule. At high RHs (RH > 92%), EWC is determined by comprehensive factors such as macropores and cracks. Furthermore, EWC can be either higher or lower than residual water content (RWC) based on the RH within a threshold residual water level (ca. 5 to 16%). EWC was generally higher than RWC below a RWC of ca. 5% and the opposite relationship was observed for samples with RWC above ca. 16%. These provide information for the operation of lignite dewatering technique, the control of its water re-adsorption, and storage.

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Section: Effect Of Rwc On Ewc At Various Rhssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effect of Hydrothermal Treatment Coupled with Mechanical Compression on Equilibrium Water Content of Loy Yang Lignite and Mechanism

et al. 2016

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“…Adsorbed water forms Mg + -water clusters Mg + (H 2 O) n . Middle humidity represents multilayer adsorption [22], Mg 2+ -water clusters are bound in capillaries, and the factor that controls water adsorption is capillary force attributed to Mg 2+ -water clusters condensed in the capillary with diameters of less than several microns. In other words, the key factor is interactions between water clusters and pores.…”

Section: The Amount Of Mg 2+ Loaded On Lignite During the Ion-exchangmentioning

confidence: 99%

Effect of Mg2+ content in ion-exchanged Shengli lignite on its equilibrium adsorption water content and its mechanism

Liu

Wang

et al. 2015

Chinese Journal of Chemical Engineering

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“…To reduce organic compounds in the water, researchers tried acid treatment in the MTE process [7,8]. Vogt and his co-workers [7] treated the lignite from Australia, Germany and Greece with 0.01 M and 0.1 M HCl at room temperature, before undergoing MTE tests at 200°C.…”

Section: Introductionmentioning

confidence: 99%

“…Vogt and his co-workers [7] treated the lignite from Australia, Germany and Greece with 0.01 M and 0.1 M HCl at room temperature, before undergoing MTE tests at 200°C. Chemical Oxygen Demand (COD) was used to assess the organic removal.…”

Section: Introductionmentioning

confidence: 99%

A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

Yeasmin

Miao

et al. 2016

Fuel Processing Technology

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Mechanical/thermal dewatering of lignite. Part 4: Physico-chemical properties and pore structure during an acid treatment within the MTE process

Cited by 55 publications

References 16 publications

Effect of Hydrothermal Treatment Coupled with Mechanical Compression on Equilibrium Water Content of Loy Yang Lignite and Mechanism

Effect of Hydrothermal Treatment Coupled with Mechanical Compression on Equilibrium Water Content of Loy Yang Lignite and Mechanism

Effect of Mg2+ content in ion-exchanged Shengli lignite on its equilibrium adsorption water content and its mechanism

A comparison of acid treatment in the dewatering of Chinese and Australian lignites by mechanical thermal expression at high temperatures

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