The effect of coal properties on the viscosity of coal–water slurries

Atesok, G.; Boylu, Feridun; Sirkeci, Ayhan Ali; Dinçer, Hatice

doi:10.1016/s0016-2361(02)00107-2

Cited by 147 publications

(83 citation statements)

References 4 publications

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“…In general, ash is hydrophilic, whereas the surface of a pure coal particle is hydrophobic. Accordingly, coal particles have poor contact affinity with water, resulting in poor stability, so additives are used to make up for this [8,9]. These additives increase the contact affinity between coal particles and water and decrease interfacial tension.…”

Section: Introductionmentioning

confidence: 99%

The effect of additive chemicals on the viscosity of coal-petroleum coke-water slurry fuel for a gasification process

Yoon

Choi

Lee

2009

Korean J. Chem. Eng.

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As a preliminary study for the gasification of an anthracite and petroleum coke mixture, viscosity was measured at various temperatures (20-50 o C), slurry concentrations (60-70 wt%) and additive amounts (0-0.8 wt%) by using an LV-II type viscometer. In addition, four types of different additives, sodium naphthalene sulfonate, poly(methyl methacrylate), polypropylene and a polypropylene glycol based additive, were applied to Korean anthracite, petroleum coke and mixtures of these materials, and the viscosity data were compared. Viscosity dependency values for coal, anthracite, bituminous and sub-bituminous coal, were compared, and it was found that a high content of moisture and particularly ash increases CWS viscosity. The four types of additives tested in this research can effectively diminish the viscosity of coal and especially petroleum coke-water slurry by more than 70% to 95%, respectively. Moreover, the sodium naphthalene sulfonate-based additive reduced the viscosity of coal and petroleum coke-water slurry best, especially at concentrations in excess of 65 wt%. Based on these results, highly loaded slurry created by mixing anthracite and petroleum coke with additives was achieved.

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Section: Introductionmentioning

confidence: 99%

The effect of additive chemicals on the viscosity of coal-petroleum coke-water slurry fuel for a gasification process

Yoon

Choi

Lee

2009

Korean J. Chem. Eng.

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“…The particle shape, the high inherent moisture, and the high oxygen content, suggested the coal was a low-rank metamorphic coal. This type of low quality coal is more difficult to prepare CWS with higher apparent viscosities compared with that of a high-rank coal [11]. Fourier transform infrared and hydrogen nuclear magnetic resonance spectra…”

Section: Methodsmentioning

confidence: 99%

“…CWS can be directly burned without dewatering [10]. Dispersants play an important role to reduce CWS viscosity and stabilize rheological properties for good atomization and efficient combustion [11,12]. To meet the potential demands for CWS, several dispersants such as naphthalene sulfonate formaldehyde condensate [13], sulfonated acetone-formaldehyde [14], carboxylate type copolymer [15], cardanol formaldehyde sulfonate [7], sodium polystyrene sulfonate [16], sodium dodecyl benzenesulfonate [17] have been studied.…”

Section: Introductionmentioning

confidence: 99%

Biorefinery lignosulfonates as a dispersant for coal water slurry

Qin

Yang

et al. 2016

Sustain Chem Process

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Background: Valorization of lignin from biofuel production is the key to developing biorefinery technologies for sustainable and economic utilization of lignocellulosic biomass. Here we present isolating lignosulfonate from the spent liquors of Sulfite Pretreatment to Overcome the Recalcitrance of Lignocelluloses (SPORL)-pretreated lodgepole pine and Douglas-fir forest residue as a dispersant for coal water slurry. The two SPORL pretreatments were conducted at a pilot scale and resulted in very high ethanol yield from the pretreated biomass. Therefore, demonstrating the commercial utility of these lignosulfonates has practical significance. Main results:The two isolated biorefinery lignosulfonates (LSs), Na-LS and Ca-LS, both had a molecular weight of approximately 9000 Da. Fundamental lignin properties such as chemical structure, functional groups were analyzed. The two LSs showed slightly better to equal performance in modifying CWS rheology than a commercial dispersant naphthalene sulfonate formaldehyde condensate (FDN), despite they were less sulfonated than FDN. Conclusions:The practical importance of this study is that the pilot-scale pretreatments that produced the two LSs also produced excellent bioethanol yields at high titer without detoxification and washing. This suggests SPORL pretreatment is a promising technology for economic bioconversion of under-utilized woody biomass.

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“…Producing high-quality CWS fuel with a high concentration (55 wt.% to 70 wt.%) and low viscosity (<1200 mPaÁs at a shear rate of 100 s À1 ) from lignite used for combustion and gasification is challenging because of the high inherent moisture content and oxygen content, poor grindability and low coalification degree of lignite. The maximum solid concentration of CWS prepared from lignite is low (40)(41)(42)(43)(44)(45) wt.%) [10]. Thermal heating (100-900°C, 0.1 MPa) [11][12][13], fluidized-bed drying process (120-300°C, 0.1 MPa) [14][15][16][17], hydrothermal treatment (250-350°C, saturated vapour pressure) [18][19][20][21][22][23], mechanical thermal expression (180-200°C, 4-6 MPa) [23][24][25] and upgraded brown coal (UBC) process based on slurry dewatering technology (130-160°C, 0.35-0.45 MPa) [26][27][28] have been employed to upgrade lignite.…”

Section: Introductionmentioning

confidence: 99%