Slurryability and flowability of coal water slurry: Effect of particle size distribution

Singh, Harmanpreet; Kumar, Satish; Mohapatra, S.K.; Prasad, Shashi Bhushan; Singh, Jatinder

doi:10.1016/j.jclepro.2021.129183

Cited by 38 publications

(10 citation statements)

References 48 publications

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“…The size of particles less than 50 μm also considerably increases the dynamic viscosity of the slurry due to high agglomeration of the particles. Therefore, the distribution of particles by size plays its role when, depending on the coal type, the distribution of particles by size is optimized to produce the minimum possible dynamic viscosity of the liquid fuel …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Therefore, the distribution of particles by size plays its role when, depending on the coal type, the distribution of particles by size is optimized to produce the minimum possible dynamic viscosity of the liquid fuel. 26 Hydrodynamic cavitation treatment affects the size of the particles in treated suspensions (Figure 3), and the size of the loose material can be inferred from the nature of the curve. It can be seen that for the initial coal sample it is convex, indicating the prevalence of coarse fraction, and for CWF1 and CWF2 samples the curves are concave and almost coinciding.…”

Section: Size Of Particles and Rheological Properties Of Cwfmentioning

confidence: 99%

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Impact of Hydrodynamic Cavitation on the Properties of Coal-Water Fuel: An Experimental Study

et al. 2022

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It is common to use coal as raw material in heat power engineering. A number of shortcomings of coal such as ignitability cannot be easily eliminated. The use of water-slurry-based coal-water fuel instead of coal eliminates this problem. The coal-water fuel (CWF) is liquid fuel, which means that the main line of investigation is to study its sedimentation and rheological properties responsible for the transport and atomization in the boiler and thermal-physical properties which determine the expedience and efficiency of its application. The paper shows that the final performance properties of suspended coal fuel can be determined at the stage of CWF preparation by hydrodynamic treatment of aqueous coal slurry. The rheological and sedimentation properties and combustion parameters of water-coal fuel, ignition time of the drop, its completeness of combustion, and amount of man-made emissions, have been studied. Studies have been carried out on coals from the Kansk-Achinsk coal basin (Russia). The studies were performed under laboratory conditions with a hydrodynamic rotary mixer, making it possible to attain cavitation effects in the processed medium. Two CWF types have been considered: the first was produced by cavitation dispersion of the solid coal fraction in distilled water, and the second was produced in analogy, but the dispersion medium was water pretreated by cavitation. The paper shows that the cavitation method of producing CWF improves the rheological and sedimentation properties of the end-use fuel, reduces hazardous emissions in combustion, and affects the combustion parameters.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Size Of Particles and Rheological Properties Of Cwfmentioning

confidence: 99%

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Impact of Hydrodynamic Cavitation on the Properties of Coal-Water Fuel: An Experimental Study

et al. 2022

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“…Much research suggested that factors including particle size, dispersant, and surface chemistry could affect the solid loading and rheological property of CWS deeply. ,− Li et al , studied the influence of particle size distribution in CWS preparation, and the concept of systematic gradation proposed that with the same concentration and additive, the slurry with the lowest viscosity could be predicted by the highest packing efficiency. Previously, we found that dispersants are necessary for CWS prepared from low-quality coal to meet the requirements for industrial storage; as an essential additive in MCWS, the dispersant plays a crucial role in qualified slurry preparation .…”

Section: Introductionmentioning

confidence: 99%

Insights into the Dispersion Mechanism of Microfine Coal Particles Modified with Naphthalene Sulfonate Formaldehyde Based on EDLVO Theory

et al. 2023

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Coal water slurry (CWS) fuel prepared using microfine coal particles with a size distribution of 1–10 μm is a promising way to cleanly utilize solid resources in engines, even catering a popular application for clean coal technology. In an attempt to address the problems in coal aggregation in microfine coal water slurry (MCWS), dispersants are used to improve the dispersing status of microfine coal particles. Based on the experimental results and extended Derjaguin–Landau–Verwey–Overbeek (EDLVO) theory calculations, the role of naphthalene sulfonate formaldehyde (NSF) in MCWS performance was explored. The measurement of the slurry ability of microfine coals demonstrated that the apparent viscosity and yield stress of MCWS were decreased significantly with 1.5% NSF addition, which was consistent with the saturated adsorption value of NSF on microfine coals. Furthermore, the ζ-potential and contact angle of microfine coals were both decreased as a function of the NSF dosage, indicating that a larger electrostatic repulsion force and better wetting ability of the coal surface would be obtained in the presence of NSF. The thickness calculation results showed that the thickness is increased with NSF addition, which is attributed to that the NSF molecule extends into the surrounding solution to form a hydrophilic film. The EDLVO calculations illustrated that the total interaction was turned from an attractive force into a repulsive force in the case of NSF, noting that the better dispersion of microfine coals mainly resulted from the better hydrophilicity of the coal surface modified with NSF. The findings might provide guidance for MCWS preparation by revealing the interaction mechanism of microfine coals modified with NSF.

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“…Dünyada elektrik üretimi çoğu ülkede büyük ölçüde fosil yakıtlara bağlı olmakla birlikte [1] geçmişten günümüze dünyada fosil yakıtlar içinde en çok bulunan enerji kaynağı kömür olmuştur [2]. Gelişmekte olan bazı ülkelerde kömür rezervlerinin de fazlalığı nedeniyle birincil enerji üretiminin 60%tan fazlası kömürden karşılanmaktadır [3].…”

Section: Introductionunclassified

Kömür Üretim Tesisi Atıksularının İleri Arıtım Prosesleri ile Arıtılarak Tekrar Kullanılabilirliğinin Araştırılması

DEMİREL¹,

ÜSTÜN²

2022

European Journal of Science and Technology

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ÖzYeraltı madenciliği ile kömür üretimi gerçekleştirilen tesislerde üretim sırasında atıksu oluşumu kaçınılmazdır. Oluşan atıksuyun deşarj edilmesinden veya proses suyu olarak kullanılmasından önce uygun arıtma yöntemleri ile arıtılması gerekmektedir. Bu çalışma kapsamında yeraltı madenciliği ile kömür üretimi gerçekleştiren bir tesiste oluşan atıksuların fiziko-kimyasal ve membran prosesler ile arıtılarak kömür zenginleştirme tesisinde tekrar kullanılabilirliği incelenmiştir. Bu kapsamda atıksudan alınan numunelerde bulanıklık, ph, KOI ve AKM parametreleri incelenmiştir. Tesisin bulanıklık gideriminde toplam verimi %99,97, KOI giderim verimi %95,16, AKM giderim verimi ise %99,72 olarak hesaplanmıştır. İnceleme sonuçları arıtılan atıksuyun kömür zenginleştirme tesisinde tekrar kullanılabileceğini bununla birlikte çevresel ve ekonomik kazançlar sağlanabileceğini göstermiştir.

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Slurryability and flowability of coal water slurry: Effect of particle size distribution

Cited by 38 publications

References 48 publications

Impact of Hydrodynamic Cavitation on the Properties of Coal-Water Fuel: An Experimental Study

Impact of Hydrodynamic Cavitation on the Properties of Coal-Water Fuel: An Experimental Study

Insights into the Dispersion Mechanism of Microfine Coal Particles Modified with Naphthalene Sulfonate Formaldehyde Based on EDLVO Theory

Kömür Üretim Tesisi Atıksularının İleri Arıtım Prosesleri ile Arıtılarak Tekrar Kullanılabilirliğinin Araştırılması

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