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V. Narendran ¹, Seralathan Sivamani ¹, V. Hariram ¹, M. Gnanaprakash ¹, A. Mohammed Raffiq ², D. Sathish Kumar ³

Affiliations
1 Department of Mechanical Engineering, Hindustan Institute of Technology and Science, Padur - 603103, Tamil Nadu, IN
2 Department of Automobile Engineering, Hindustan Institute of Technology and Science, Padur - 603103, Tamil Nadu, IN
3 Department of Aeronautical Engineering, Hindustan Institute of Technology and Science, Padur - 603103, Tamil Nadu, IN

Abstract

Objectives: This paper deals with the theoretical and numerical analysis of a convective recuperator used to recover waste heat from the stack flue gases and use it to pre heat the air before it is fed into the combustion chamber of an oil fired water tube boiler. Methods/Statistical Analysis: Three different tube diameters are considered in the present study. Theoretical analysis is carried out to determine the efficiency and other parameters of the boiler with and without recuperator. To support the theoretically obtained results on improved boiler performance by pre heating the air using recuperator, numerical simulation studies is carried out. Findings: The study showed that 10” inch (0.254 m) pipe diameter arranged in a 3 x 3 array gave a flow velocity of air at around 15 to 25 m/s. The stack flue gas exit temperature decreased from 200oC to 135.50oC whereas the inlet air temperature after pre heating through the recuperator is found to be 85oC with a rise in temperature of around 50oC. After pre heating the air, the efficiency of the boiler improved from 71.90% to 74.60%. The quantity of furnace oil saved per day is 3.76% with respect to its present consumption level. CFD simulations are carried out using ANSYS CFX. A good agreement is found between the data obtained from simulation and theoretical analysis. Payback period by incorporating the recuperator to the existing boiler is estimated to be 60 working days. Application/ Improvements: Optimized performance improvement of existing boiler used in industries is possible without extensive redesign by recovering waste heat leading to energy conservation.

Keywords

Air, Boiler, Convective Recuperator, Flue Gas, Performance, Pre Heat.

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V. Hariram ¹, S. Seralathan ¹, A. Mohammed Raffiq ²

Affiliations
1 Department of Mechanical Engineering, Hindustan Institute of Technology and Science, Hindustan University, Chennai, Tamil Nadu, IN
2 Department of Automobile Engineering, Hindustan Institute of Technology and Science, Hindustan University, Chennai, Tamil Nadu, IN

Abstract

Elimination of solid waste generated by the engineering sector is the need of the present world. In this study, a comparative analysis has been made to formulate a petro-diesel like fuel from the waste tyre (WTPO) and waste plastic (WPPO), which is derived from unusable tyre and plastic waste materials, by the thermal pyrolytic reaction. A pyrolysis reactor is designed and fabricated to transform the solid waste into the pyrolytic oil through thermal cracking. The characterization of WTPO and WPPO is carried out using the gas chromatography, mass spectrometry, Fourier transform infra-red and elemental analysis. The GC-MS analysis of both WPTO and WPPO indicated the presence of naphtha and limonene compounds at higher concentration levels. The content of sulphur in WTPO is at higher level. The physico-chemical properties are also determined based on IS:1448 and it is found to be comparable with the commercial petro-diesel.

Keywords

Pyrolytic Oil, Solid Waste, Waste Tyre, Waste Plastic.

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