scholarly journals Vacuum filter and direct current electro-osmosis dewatering of fine coal slurry

2009 ◽  
Vol 1 (1) ◽  
pp. 685-693 ◽  
Author(s):  
Dong Xian-shu ◽  
Hu Xiao-jie ◽  
Yao Su-ling ◽  
Ren Wei-peng ◽  
Wang Zhi-zhong
Keyword(s):  
Direct Current ◽  
Coal Slurry ◽  
Vacuum Filter ◽  
Fine Coal ◽  
Electro Osmosis

scholarly journals Combustion of coal water slurry-technology enabling the achievement of a reduced technical minimum of the boiler

2019 ◽  
Vol 82 ◽  
pp. 01004 ◽  
Author(s):  
Krzysztof Głód ◽  
Janusz Lasek ◽  
Krzysztof Słowik ◽  
Jarosław Zuwała
Keyword(s):  
Coal Slurry ◽  
Research History ◽  
Water Slurry ◽  
Fine Coal ◽  
Coal Sludge ◽  
Coal Water Slurry ◽  
Close Relationship ◽  
Slurry Technology

The idea of combustion of suspended fuels was developed in the 1980s. The largest producer and user of slurry fuels (Coal Water Slurry, CWS) is China [3]. Despite of several decades of CWS research history, investigations are still carried out to improve the parameters of disperse fuels and to improve the combustion of these fuels. The close relationship between the properties of slurry fuels and number of parameters (mainly the type and properties of the coal feedstock) generates the necessity of CWS receipts and determines for what purposes the fuel may be destined. In the case of the use of coal sludge, the resulting slurry allows for the combustion / "disposal" of coal slurry in pulverized boilers. In the case of using better quality fine coal fractions in CWS production, a slurry will be created allowing for achieving the crucial technological goal such as operation of power units with a reduced technical minimum.

Study on Dewatering of Fine Coal by Combination of Electrolysis and Filtration

2011 ◽  
Vol 236-238 ◽  
pp. 622-626 ◽  
Author(s):  
Xian Shu Dong ◽  
Lai Hong Feng ◽  
Su Ling Yao ◽  
Dong Fang Niu
Keyword(s):  
Moisture Content ◽  
Coal Slurry ◽  
Coal Preparation ◽  
Experimental Conditions ◽  
Flotation Process ◽  
Pressure Filtration ◽  
Fine Coal ◽  
Direct Pressure ◽  
The Impact ◽  
Pressure Filter

With enhanced awareness of energy conservation and environmental protection, more attention has been paid to the high moisture content of the filtration products used in the flotation process as commonly employed in coal preparation plants. In this paper, we choose fine coal (–0.5mm) samples obtained from the Xiqu Coal Preparation Plant in China as our research objective. Tests were performed under three different experimental conditions: direct pressure filtration, electrolysis pressure filtration, and electricity decompression filtration with different electrodes. Thus our aim was the evaluation of the impact of electrodes on the electrolysis-pressure-filtration effect on fine coal dewatering. The results of this study indicate that when the coal slurry concentration is 400g/L, and when the electrode is aluminum-aluminum (90V, 14min), we can achieve the best effect and the lowest moisture content of the filter cake, which is 10%. The electrolysis pressure filter has a high dewatering efficiency, an advanced technical index, requires little power consumption (obviously energy-saving), needs only a small amount of maintenance, and is stable and reliable in operation, Thus the electrolysis pressure filter is the most effective and economical processing equipment for fine coal dewatering and has prospects for broad application.

Improving the Dewatering of Marine Sediment Using a Combination of Geo-Textile and Electrokinetic Treatment

2017 ◽  
Author(s):  
Silja Kostia ◽  
Janika Tuomi ◽  
Martin Romantschuk
Keyword(s):  
Water Column ◽  
Direct Current ◽  
Marine Sediment ◽  
Clay Content ◽  
Water Layer ◽  
Control Treatment ◽  
Dredged Material ◽  
Dredged Sediment ◽  
Electric Treatment ◽  
Electro Osmosis

The purpose of this study was to test whether electro-osmosis can be used to increase the effectiveness of dewatering of dredged sediment being drained in geo- textile tubes. The marine sediment used in the study had a high proportion of clay known to be problematic in geo-tube treatment. The laboratory set-ups were performed using sediment-filled sacks (approximately 5-7 liters / sack) sewn from geo-textile (TenCate Geotube® GT500), and plastic columns (approximately 1.6 liters / column) closed at the bottom with geo-textile, both supplied with electrodes for applying direct current. In the sack set-ups, a seven-hour electric treatment led to the same result as the 72-hour control treatment. The volume of the sediment decreased in column set-ups by 32 % due to electric treatment while only a 14 % decrease was obtained in the controls after 189 hours. The water layer on top of the sediment treated with electro-osmosis decreased by up to one-fifth, as compared to the control columns. We can conclude that electro-osmosis is an effective approach to boost the dewatering of the dredged sediment treated in geo-textile tubes. When draining sediment with a high clay content, electric treatment can prevent the formation of a water column on top of the sediment. This in turn accelerates dewatering of the dredged material.

Fabrication and Preparation of Coal-Water Slurry Dispersant with Amphoteric Polycarboxylate

2011 ◽  
Vol 335-336 ◽  
pp. 1257-1261
Author(s):  
Jun Feng Zhu ◽  
Guang Hua Zhang ◽  
Zhuo Miao ◽  
Hao Hao
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Glycol ◽  
Coal Slurry ◽  
Trimethylammonium Chloride ◽  
Water Slurry ◽  
Fine Coal ◽  
Dispersion Agent ◽  
Cationic Monomer ◽  
Coal Water Slurry ◽  
Better Than

Coal-water slurry （CWS）dispersant is a key to prepare fine coal-water slurry. A novel amphoteric polycarboxylic (AmPC) dispersant for CWS was copolymerized in aqueous solution by comonomers methacrylate polyglycol monoester (PA), propylene sulfur sodium (SAS) and cationic comonomer methacryloyloxy ethyl trimethylammonium chloride(DMC).Methacrylate polyglycol monoester was prepared by direct esterifying with methacrylate acid (AA) and polyethylene glycol (PEG) in our laboratory. And then, The molecule structure of amphoteric polycarboxylic dispersant was characterized by FTIR. Besides, the dispersant was applied in Shenfu coal slurry. Through examining properties of the coal slurry, the effects of amount of cationic monomer DMC, the concentration of initiator and reaction temperature on dispersant performance were discussed. The result shows that the viscosity reducing of amphoteric polycarboxylic dispersant is better than the dispersant in stock which hasn’t cationic monomer when the dosage of DMC is 5.0wt%. It has been proved that the amphoteric polycarboxylic dispersion agent is suitable for Shenfu coal slurry. When the dosage of AmPC dispersant is up to 0.5wt%, the highest concentration of coal-slurry can reach 65.4wt%.

Dewatering of fine coal slurry using waste fibrous material

2003 ◽  
Vol 20 (2) ◽  
pp. 102-106
Author(s):  
B. K. Parekh ◽  
X. X. Shao ◽  
D. J. Sung
Keyword(s):  
Fibrous Material ◽  
Coal Slurry ◽  
Fine Coal

Characterization of static and dynamic geotechnical properties and behaviors of fine coal refuse

2019 ◽  
Vol 56 (12) ◽  
pp. 1901-1916 ◽  
Author(s):  
Sajjad Salam ◽  
Ming Xiao ◽  
Arash Khosravifar ◽  
Min Liew ◽  
Shimin Liu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Water Pressure ◽  
Geotechnical Properties ◽  
Cyclic Behavior ◽  
Coal Slurry ◽  
Liquefaction Resistance ◽  
Fine Coal ◽  
Coal Refuse

The geotechnical properties, cyclic behavior, and liquefaction resistance of in situ fine coal refuse (FCR) have not been sufficiently investigated. This paper presents the characterization of static and dynamic geotechnical properties of in situ coal slurry samples. Representative coal slurry samples were taken from two coal slurry impoundments in the Appalachian coalfields in the USA. Standard penetration tests (SPTs) were conducted. Index properties, hydraulic conductivity, shear strength, and shear stiffness of the FCR were determined. The geotechnical properties of the representative FCR were found significantly dependent on the location and depth of the samples. However, the FCR samples were classified as soft and low plasticity silty sands to sandy silts. Cyclic direct simple shear (DSS) tests were conducted on representative samples prepared using slurry deposition method to evaluate the liquefaction resistance and cyclic behavior of FCR. The cyclic stress ratio – number of cycles required for liquefaction occurrence (CSR–N) curve for FCR was established. The cyclic resistance of FCR compared well with the empirical correlations for sand-like materials, though the stress–strain behavior and pore-water pressure generation exhibited clay-like behavior. Each cyclic DSS test was followed by a static shearing to assess the post-liquefaction shear strength of the FCR. Significant decrease in shear modulus and dilative behavior were observed after liquefaction.

Improved Techniques for Hyperbaric Filtration of Fine Coal Slurry

2010 ◽  
Vol 30 (1) ◽  
pp. 32-43 ◽  
Author(s):  
J. Yang ◽  
X. H. Wang ◽  
B. K. Parekh
Keyword(s):  
Coal Slurry ◽  
Fine Coal
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