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Kinetic Energy Recovery from the Chimney Flue Gases Using Ducted Turbine System

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Abstract

An innovative idea of extracting kinetic energy from man-made wind resources using ducted turbine system for on-site power generation is introduced in this paper. A horizontal axis ducted turbine is attached to the top of the chimney to harness the kinetic energy of flue gases for producing electricity. The turbine system is positioned beyond the chimney outlet, to avoid any negative impact on the chimney performance. The convergent-divergent duct causes increase in the flue gas velocity and hence enhances the performance of the turbine. It also acts as a safety cover to the energy recovery system. The results from the CFD based simulation analysis indicate that significant power 34 kW can be harnessed from the chimney exhaust. The effect of airfoils NACA4412 and NACA4416 and the diffuser angle on the power extraction by the energy recovery system using a 6-bladed ducted turbine has been studied with the CFD simulation. It is observed that the average flue gas velocity in the duct section at the throat is approximately twice that of the inlet velocity, whereas maximum velocity achieved is 2.6 times the inlet velocity. The simulated results show that about power may be extracted from the chimney flue gases of 660 MW power plant. The system can be retrofitted to existing chimneys of thermal power plants, refineries and other industries.

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Abbreviations

V :

Average velocity of flue gases

\(\dot{m}\) :

Mass flow rate of flue gases

ρ :

Flue gas density

U :

Free stream velocity

T :

Temperature of flue gases at inlet

P 1 :

Pressure of flue gases at duct inlet

P 2 :

Atmospheric Pressure of flue gases

\(u, v, w\) :

Velocity components of flue gases

R :

Turbine rotor radius

ω :

Angular velocity, rate of eddy dissipation

P :

Power

τ :

Torque

C T :

Coefficient of torque

C P :

Coefficient of power

λ :

Tip speed ratio

η :

Efficiency

α :

Angle of attack

θ :

Diffuser angle

q :

Heat transfer

k :

Variance of velocity fluctuations

ɛ :

Turbulence eddy dissipation

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Acknowledgement

Authors would like to express gratitude to the anonymous reviewers for their useful comments for correction and improvement of the manuscript. The input given by Dr. K. Muralidhar of IIT, Kanpur, and Dr. Subhash Chander of NIT, Jalandhar in finalizing the area of research are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sant Longowal Institute of Engineering and Technology, Longowal, Punjab, 148106, India

    Harjeet S. Mann & Pradeep K. Singh

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  1. Harjeet S. Mann
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Correspondence to Pradeep K. Singh.

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Mann, H.S., Singh, P.K. Kinetic Energy Recovery from the Chimney Flue Gases Using Ducted Turbine System. Chin. J. Mech. Eng. 30, 472–482 (2017). https://doi.org/10.1007/s10033-017-0090-8

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  • DOI: https://doi.org/10.1007/s10033-017-0090-8

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