Please use this identifier to cite or link to this item: http://hdl.handle.net/10266/5518
Title: Investigation of flow characteristics for coal-charcoal slurry fuel
Authors: Singh, Anil
Supervisor: Mohapatra, S. K.
Kumar, Satish
Keywords: Additive, particle size distribution, rheology, static settling
Issue Date: 19-Jul-2019
Abstract: The rheological characteristics of uni-modal and multivariate coal-charcoal water slurry have been studied. The study aimed to investigate the physical, chemical and morphological characteristics of coal and charcoal particles. Present study also includes the experimental investigation of flow characteristics of coal charcoal slurry. The physical, chemical and mineralogical properties such as chemical composition, particle size distribution (PSD), shape, static settled concentration, HGI, proximate analysis, ultimate analysis, calorific value and pH of slurry were carried out prior to examination of rheological characteristics of coal charcoal water slurry. The surface microstructure was investigated by using scanning electron microscopy (SEM) technique. The chemical composition was determined by using electron dispersive spectroscopy (EDS) technique. Particle size distribution of coal and charcoal particles was carried out by using British standard sieves. The simulations were carried out by digital interpretations by reading the pixel and grey value information present in a particular SEM micrograph. The coal and charcoal particles were found irregular in shape and charcoal was more porous. The pH value of coal water slurries was lie in the range of 5.94 to 6.22 ,8.48 to 8.7 for charcoal water and for 6.25 to 7.2 coal charcoal water slurry. If fine charcoal particle below 53 μm is added to coal water slurry static stability was enhanced by 12%. Three Indian coal samples were procured from different thermal plants and charcoal. They were designated as C1, C2, C3 and C4 and were investigated by using Anton Paar RheolabQC rheometer to generate extensive rheological data. From rheology studies it was found that the all type of coal-water slurry shows Newtonian behaviour upto 30% solid loading and at 40% solid loading coal-water slurry shows pseudo-plastic i.e. (shear thinning) behaviour. Beyond 40% of solid loading coal-water slurry shows Herschel-Bulkley behaviour while at 30% of charcoal loading rheological behaviour was pseudo-plastic in nature and beyond 30% of charcoal loading flow behaviour was Herschel-Bulkley. At 60% of charcoal loading in charcoal water slurry the apparent viscosity is crossed the limiting value of apparent viscosity. Mono-modal of charcoal water slurry has less apparent viscosity as comparison with bi-modal of charcoal water slurry. In coal-charcoal water slurry apparent viscosity value increase as the charcoal % increases in slurry with comparison of coal water slurry while charcoal fine particles are added upto 20% by weight of total solid loading the apparent viscosity is lower with comparison of coal water slurry for 40% and 50% of total solid loading. Further, increases in charcoal percentage apparent viscosity iv increases. The coal-charcoal slurry shows lower viscosity for all test at various dosages of additives and at 2% by weight addition of Triton X-100 in slurry maximum rate of reduction of apparent viscosity in the slurry for both the cases. Average reduction in apparent viscosity of slurry in which coal and charcoal was blended in equal ratio was 16 % and when ratio of coal and charcoal was 60:40 reductions in apparent viscosity was 19%.
URI: http://hdl.handle.net/10266/5518
Appears in Collections:Masters Theses@MED

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