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16 results on '"Choudhary, Akshay"'

5. Characterization of Cement Grouted Semi-flexible Pavement

Author

Singh, Jugmohan, Kumar, Rajiv, Choudhary, Akshay, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Biswas, Sabyasachi, editor, Metya, Subhadeep, editor, Kumar, Sanjay, editor, and Samui, Pijush, editor

Published
2021
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8. Targeting ash generated from coal combustion as secondary source of rare earth elements.

Author

Singh Choudhary, Akshay Kumar, Kumar, Santosh, Sharma, Raj Vardhan, Satyanarayanan, Manavalan, and Maity, Sudip

Subjects
*RARE earth metals, *COAL combustion, *COAL ash, *STEAM power plants, *PEARSON correlation (Statistics), *HAZARDOUS substances
Abstract

The demand of Rare Earth Elements (REEs) has increased for the development of clean and green technologies. Conventional geological sources of REE are insufficient to overcome the high demand of REE; hence, the secondary resources are being actively explored. Coal ashes (CAs), a potentially hazardous material, is one of the best secondary sources containing high concentration of REE. The present study aims to explore the abundance of REE in coal and coal ash from different Thermal Power Stations (TPS). The mineralogy and surface morphology of all samples have been determined. The coals mostly consist of quartz and kaolinite, whereas CAs predominantly contain quartz and mullite. Both coal and CAs are dominated by LREE elements, followed by MREE and HREE. The outlook coefficient (Cout) is close to "1" and the critical percentage (Cp) is more than 30%. Coal ash from some of the TPS is identified as secondary source for REE. Fractionation study of REE from coal to CA is carried out to understand the feasibility of CA. A Pearson correlation has been plotted for individual REE elements with other parameters to understand the affinity of REE to different phases of CA. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Scale Minimization in Sugar Industry Evaporators using Nanoporous Industrial Bio-solid Waste Bagasse Fly Ash

Author

Rajeev Nath Tiwari, Gaurav Verma, Suresh Kumar, Keya Dharamvir, and Choudhary Akshay Gandharv

Subjects
Materials science, Nanoporous, Mullite, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Adsorption, Chemical engineering, Fly ash, Kaolinite, 0210 nano-technology, Bagasse, Mesoporous material, Sugar, Agronomy and Crop Science
Abstract

Scale deposition on the surface of heat exchangers of the evaporators of a sugar mill is the bane of sugar industry. It causes corrosion of surfaces, restricts fluid flow and impairs heat transfer (because it has very low thermal conductivity) across the metal–fluid interface. Accumulation of scale is the combined effect of several processes involving inorganic/organic molecules or ions present in the cane juice. Bagasse fly ash (BFA), obtained from the flue-gas line of bagasse-fired boilers, exhibits unique characteristics such as very high carbon content (49%), large surface area (~ 500 m2/g), high pore volume, mesoporous pore size and spontaneous adsorption, rendering it suitable as adsorbent for clarification of cane juice, a process purporting to remove several of the impurities. The aim of the present paper is to study the feasibility of using BFA (primary mesh size of 200 μm) as adsorbent for clarification of industrial cane juice which in turn would minimize formation of scale. BFA consists of globular structures aggregated in a fractal-like configuration, with pore sizes ranging between 100 nm and 1.0 µm. After it has adsorbed impurities from cane juice (becoming A-BFA), its X-ray diffraction and FTIR spectroscopy show the presence of silica, alumina (Al2O3), CaO, CaSiO3, Ca8Si5O18, mullite, quartz, haematite, kaolinite and amorphous silica. Rate of adsorption as a function of BFA dosage and reaction time was studied using spectrophotometer and colorimeter. Up to 19% colour reduction takes place in cane juice treated with BFA. The results suggest that BFA can be effectively used for initial clarification (in particular, removal of silica, quartz, mullite and calcite) of sugar cane juice.

Published
2018

16. Making Indian airports sustainable by using solar photovoltaic system: analysis of three airports.

Author

Choudhary, Akshay, Saxena, Bharat Kumar, and Mishra, Sanjeev

Subjects
*PHOTOVOLTAIC power systems, *SOLAR power plants, *CARBON dioxide reduction, *AIRPORT terminals, *SOLAR energy, *AIRPORTS, *FACTORY design & construction
Abstract

Consumption of fossil fuel generated electrical energy can be reduced substantially by the application of renewable energy systems in transportation-related facilities like airports. This paper focuses on present trend of usage of three domestic airports of India located geographically at different locations and proposes a detailed design and feasibility analysis of grid-connected solar photovoltaic power plants for three airports located at Udaipur, Raipur and Aurangabad. The capacity of solar PV power plants designed at Udaipur, Raipur and Aurangabad airports are 2.43 MWp, 3.20 MWp and 2.08 MWp respectively. Carbon dioxide emission reduction due to the energy generated by solar PV power plants at Udaipur, Raipur and Aurangabad airports are 3919.156 tCO2, 4634.596 tCO2 and 3167.559 tCO2 respectively. [ABSTRACT FROM AUTHOR]

Published
2021
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