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14 results on '"Potnuri, Ramesh"'

10. Advances in Computational Fluid Dynamics Modeling for Biomass Pyrolysis: A Review

Author

Anirudh Kulkarni, Garima Mishra, Sridhar Palla, Potnuri Ramesh, Dadi Venkata Surya, and Tanmay Basak

Subjects
CFD, pyrolysis, biomass, microwave, temperature, products, Technology
Abstract

Pyrolysis, a process for extracting valuable chemicals from waste materials, leverages computational fluid dynamics (CFD) to optimize reactor parameters, thereby enhancing product quality and process efficiency. This review aims to understand the application of CFD in pyrolysis. Initially, the need for pyrolysis and its role in biomass valorization are discussed, and this is followed by an elaboration of the fundamentals of CFD studies in terms of their application to the pyrolysis process. The various CFD simulations and models used to understand product formation are also explained. Pyrolysis is conducted using both conventional and microwave-assisted pyrolysis platforms. Hence, the reaction kinetics, governing model equations, and laws are discussed in the conventional pyrolysis section. In the microwave-assisted pyrolysis section, the importance of wavelength, penetration depth, and microwave conversion efficiencies on the CFD are discussed. This review provides valuable insights to academic researchers on the application of CFD in pyrolysis systems. The modeling of pyrolysis by computational fluid dynamics (CFD) is a complex process due to the implementation of multiple reaction kinetics and physics, high computational cost, and reactor design. These challenges in the modeling of the pyrolysis process are discussed in this paper. Significant solutions that have been used to overcome the challenges are also provided with potential areas of research and development in the future of CFD in pyrolysis.

Published
2023
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11. Effect of solvent pre-treatment on microwave assisted pyrolysis of Spirulina(Algal Biomass) and Ficus benghalensis(Lignocellulosic Biomass) for production of biofuels: comparative experimental studies

Author

Varma, Jampana Vishnu, Sridevi, Veluru, Musalaiah, Modi, King, Pulipati, Hamzah, Husam Talib, Tanneru, Hemanth Kumar, Potnuri, Ramesh, and Malleswari, G Bhagya

Abstract

• Spirulinapretreated with Ethanol had a maximum bio-oil production of 56.1 wt %.

Published
2024
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12. Synthesis of sustainable chemicals from waste tea powder and Polystyrene via Microwave-Assisted in-situ catalytic Co-Pyrolysis: Analysis of pyrolysis using experimental and modeling approaches

Author

Dadi V. Suriapparao, Veluru Sridevi, Potnuri Ramesh, Chinta Sankar Rao, M. Tukarambai, Dinesh Kamireddi, Ribhu Gautam, Swapnil A. Dharaskar, and Kocherlakota Pritam

Subjects
Environmental Engineering, Hot Temperature, Tea, Renewable Energy, Sustainability and the Environment, Biofuels, Polystyrenes, Bioengineering, General Medicine, Powders, Microwaves, Waste Management and Disposal, Catalysis, Pyrolysis
Abstract

In the current study, catalytic co-pyrolysis was performed on waste tea powder (WTP) and polystyrene (PS) wastes to convert them into value-added products using KOH catalyst. The feed mixture influenced the heating rates (17-75 °C/min) and product formation. PS promoted the formation of oil and WTP enhanced the char formation. The maximum oil yield (80 wt%) was obtained at 15 g:5 g, and the maximum char yield (44 wt%) was achieved at 5 g:25 g (PS:WTP). The pyrolysis index (PI) increased with the increase in feedstock quantity. High PI was noticed at 25 g:5 g, and low PI was at 5 g:5 g (PS:WTP). Low energy consumption and low pyrolysis time enhanced the PI value. Significant interactions were noticed during co-pyrolysis. The obtained bio-oil was analyzed using GC-MS and a plausible reaction mechanism is presented. Catalyst and co-pyrolysis synergy promoted the formation of aliphatic and aromatic hydrocarbons by reducing the oxygenated products.

Published
2022

13. Understanding of synergy in non-isothermal microwave-assisted in-situ catalytic co-pyrolysis of rice husk and polystyrene waste mixtures

Author

Veluru Sridevi, Dadi V. Suriapparao, M. Tukarambai, Avinash Terapalli, Potnuri Ramesh, Chinta Sankar Rao, Ribhu Gautam, J.V. Moorthy, and C. Suresh Kumar

Subjects
Environmental Engineering, Hot Temperature, Renewable Energy, Sustainability and the Environment, Polystyrenes, Bioengineering, Oryza, General Medicine, Gases, Microwaves, Waste Management and Disposal, Catalysis, Pyrolysis
Abstract

Rice husk (RH) and polystyrene (PS) wastes were converted into value-added products using microwave-assisted catalytic co-pyrolysis. The graphite susceptor (10 g) along with KOH catalyst (5 g) was mixed with the feedstock to understand the products and energy consumption. RH promoted the char yield (20-34 wt%) and gaseous yields (16-25 wt%) whereas PS enhanced the oil yield (23-70 wt%). Co-pyrolysis synergy induced an increase in gaseous yields (14-53 wt%) due to excessive cracking. The specific microwave energy consumption dramatically decreased in co-pyrolysis (5-22 kJ/g) compared to pyrolysis (56-102 kJ/g). The pyrolysis index increased (17-445) with the increase in feedstock quantity (5-50 g). The obtained oil was composed of monoaromatics (74%) and polyaromatics (18%). The char was rich in carbon content (79.5 wt%) and the gases were composed of CO (24%), H

Published
2022

14. The role of solvent soaking and pretreatment temperature in microwave-assisted pyrolysis of waste tea powder: Analysis of products, synergy, pyrolysis index, and reaction mechanism

Author

Husam Talib Hamzah, Veluru Sridevi, Meghana Seereddi, Dadi V. Suriapparao, Potnuri Ramesh, Chinta Sankar Rao, Ribhu Gautam, Fiyanshu Kaka, and Kocherlakota Pritam

Subjects
Hot Temperature, Environmental Engineering, Ethanol, Tea, Renewable Energy, Sustainability and the Environment, Temperature, Benzene, Bioengineering, General Medicine, Acetone, Biofuels, Solvents, Powders, Microwaves, Waste Management and Disposal, Pyrolysis
Abstract

This study focuses on microwave-assisted pyrolysis (MAP) of fresh waste tea powder and torrefied waste tea powder as feedstocks. Solvents including benzene, acetone, and ethanol were used for soaking feedstocks. The feedstock torrefaction temperature (at 150 °C) and solvents soaking enhanced the yields of char (44.2-59.8 wt%) and the oil (39.8-45.3 wt%) in MAP. Co-pyrolysis synergy induced an increase in the yield of gaseous products (4.7-20.1 wt%). The average heating rate varied in the range of 5-25 °C/min. The energy consumption in MAP of torrefied feedstock (1386 KJ) significantly decreased compared to fresh (3114 KJ). The pyrolysis index dramatically varied with the solvent soaking in the following order: ethanol (26.7) benzene (25.6) no solvent (10) acetone (6). It shows that solvent soaking plays an important role in the pyrolysis process. The obtained bio-oil was composed of mono-aromatics, poly-aromatics, and oxygenated compounds.

Published
2022
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