Combined effect of particle size distribution and cationic –anionic mixture surfactant on high ash coal water slurry

Abstract

With the shortage of petroleum products and the depletion of the oil layer, the most significant scientific challenge is to use fuel most economically. Due to easy availability and low cost, more than decades of coal has been used in India for power generation in power plants. As CWS (coal-water slurry) has been accepted in many industries due to its low cost, easy handling, and low emission, still more research is needed to be done to work with multimodal high ash coal and simultaneously to save energy (like pumping power and to enhance the combustion temperature). In this experiment, the effect of high ash content coal in multimodal coal water slurry with additives and without additives and particle size distribution, shear rate, and shear stress on the rheological behavior of CWS has been investigated. By suitable combination, adding fine coal particles with the coarser, different samples were prepared and found that coal concentration of 67 % by weight having a viscosity within permissible value and after mixing with additives concentration of 50 % of CTAB (Cetyltrimethyl ammonium bromide) and SDC (Sodium di-dodecyl sulphate) the apparent viscosity reduces to the minimum value. Adding more CTAB in the slurry will increase the viscosity, and in the presence of these additives, the stability of MSA-1 is 18 days at a weight concentration of 67 %, meaning the slurry will work for 18 days. Significantly less work has been done in high-ash coal with multimodal samples. Here, an attempt has been made with this high ash multimodal sample along with the combination of mixture surfactant to achieve high concentration with less viscosity.