Effective transportation of fly ash–water slurry
through a pipeline from its generation site, a power plant, to a storage
site by replacing commercial surfactants such as cetyl trimethyl ammonium
bromide and sodium dodecyl sulfate by a natural dispersant extracted
from Sapindus laurifolia was studied. The stability of fly ash slurry was determined from its
rheological parameters, dispersant concentration, and stabilization
mechanism. From surface tensiometric data, the critical micelle concentration
of the dispersant was obtained to be 0.017 g/cc. The stabilization
of high-concentration fly ash slurry has been studied through its
rheological behavior by variation of temperature and dispersant and
ash concentration. The rheological result obtained for fly ash concentrations
in the range of 50–65% slurry was best justified by the Bingham
plastic model. The wettability of fly ash particles is increased in
the presence of dispersants, which is inferred from reduction of the
surface tension value. The stabilization mechanism of the slurry is
explained by a steric factor as indicated by the decrease in the zeta
potential value. Air pollution is minimized at its destination site
due to agglomeration of fly ash particles, which is confirmed from
the SEM microphotograph.
Background:
The alternative of oil is highly essential in the present context due to acute shortage of oil as well as increasing demand for it from different public and private sectors. Since 1980, attention has been focused on coal-water slurry as an alternative fuel for the power generation industry and a suitable substitute for oil in several industrial applications.One of the exciting areas in coal water slurry (CWS) is coal –water –alcohol slurry in which different alcohol compound can act as a dispersant for stabilisation of coal –water slurry.
Objective:
The objective of this paper is to prepare a high concentration coal –water -alcohol slurry using glycerol, glycol and ethanol as an additive,and different particle size distribution of coal.This will increase surface activity of the coal there by decreasing the viscosity of the slurry.
Method:
Two bimodal in which coarse particles are (212 µm - 300 µm), (150µm – 212 µm) and fine particle below 75 µm are prepared.. Three types of alcohols additive namely glycerol,glycol and ethanol are used as dispersant. Malvern Particle size analyzer is used to measure the particle size distribution of the coal samples. Rheological study of CWAS was conducted using HAAKE RHEO STRESS 1.
Result:
From experiment it is concluded that the optimum addition of glycerol in water is taken as 90:10 of water and glycerol ratio because after that there is no further decrease in the value of viscosity.Optimum value of glycol and ethanol mixed in water was determined and found as in the ratio of 86:14 and 82:18 respectively.
Conclusion:
From different parameters study like coal concentration, pH, temperature,apparent viscosity and stability it is concluded that coal -water -glycerol slurry is better than other coal water alcohol slurry. This is because of the presence of more OH- groups in glycerol. The static stability of this coal water alcohol slurry exists for the maximum period of 31 days.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.