Puneet Juneja

Bio: Puneet Juneja is an academic researcher from Thapar University. The author has contributed to research in topics: Coal & Porosity. The author has an hindex of 1, co-authored 2 publications receiving 4 citations.

Influence of Chemical Leaching on Rheology and Ash Reduction of Indian Coal

Abstract: The quality and calorific value of Indian coal are very low. The objective of the present study was to reduce the ash content and to produce ultraclean coal (UCC). The low-ash-content coal was then...

Experimental investigation on effects of solid concentration, chemical additives, and shear rate on the rheological properties of bottom ash (BA) slurry

Abstract: An experimental analysis is done for understanding the effect of various parameters like shear rate, solid concentration, and particle size on rheological behavior of bottom ash slurry. The coarser...

Additive for coal water slurry made from weak slurryability coal

Abstract: Surface treatment of weak slurryability coal and preparation of highly concentrated coal water slurry (CWS) have been investigated using wettability and rheology measurements. By adding 0.5{approximately}10 wt.% (based on coal) pitch during dry milling coal surface became more hydrophobic and the coal could be easily prepared for CWS which had much lower viscosity compared with CWS of the untreated coal. The reasons of this result is high degree of hydrophobic surface of coal particles made surfactant adsorption easier compared with high degree of hydrophilic surface of coal particles. Another important reason in hydrophobic surface impeded the penetration of water into the inner pores of coal particles which resulted in decreasing swelling ability of coal and enhancing the fluidity of CWS. Four different additives have been investigated including three nonionic ethoxylated surfactants and one mixture of anionic surfactants (sodium humate derivative and naphthalenesulfonic acid-HCHO condensate). Both rheological and thixotropic properties showed that nonionic surfactant G2 was the most efficient additive for preparation of highly concentrated CWS. The results of dynamic experiment illustrated that the slurry had good dynamic stability, in other words, the viscosity of the slurry decreased very slowly at constant stir. The pitch treated coal powders were beneficiated coalmore » had much lower viscosity compared with CWS of the unbeneficiated coal.« less

A Review of Methods, and Analytical and Experimental Studies on the Use of Coal–Water Suspensions

Abstract: Research in the field of building mathematical models for combustion processes has been ongoing ever since the chemical reactions of combustion were first discovered. The authors of this review have systematized mathematical models of coal–water suspension (CWS) combustion processes, the sequence of analytical and experimental studies, and have also shown the global genesis of the CWS use. In addition, this review touches upon a topic that is inextricably linked with the combustion of CWS, namely their transportation from the place of coal mining to their place of thermal utilization. For developing countries, their own energy independence is in the foreground, as it is the basis for their economic independence and also a means for other sectors of their economy to be protected from the impact of market changes in fuel prices in the future spot world market. The authors of this review explored the possibility of using Kyrgyz brown coal and transporting it through a coal pipeline from a mountainous area to an industrial site for thermal utilization in specialized steam boiler units. As the economic analysis showed, for the conditions of the Republic of Kyrgyzstan, the use of CWS and coal pipelines with rising prices for natural gas is economically justified. The recommendations of the authors are used in scientific reports and methodological recommendations for the energy and mining sectors of the Republic of Kyrgyzstan, how the recommendations can also be applied to similar conditions in the highlands of Russia, China, and India.

Alternative Fuel Technologies and Guidance Systems for the Quayside Transit Scheme

Abstract: This paper reviews the research conducted on the potential for alternative fuel technologies and guidance systems applicable for the planned Tyne Quayside Transit project. The two specific task for the research were the review of alternative fuel technologies for bus operations and an assessment of recent developments in wire guidance systems since a 1996 demonstration project. The review of alternative fuels is structured as follows: an overview of 'cleaner' fuels, a summary of practical experience, and an assessment of the suitability for the Quayside Transit Route. Details of alternative vehicles are also presented for the two most promising options. The paper reviews the findings of an evaluation of the guidance systems demonstrated in 1996.