Pneumatic hybridization of a diesel engine using compressed air storage for wind-diesel energy generation

In this paper, we are studying an innovative solution to reduce fuel consumption and production cost for electricity production by Diesel generators. The solution is particularly suitable for remote areas where the cost of energy is very high not only because of inherent cost of technology but also due to transportation costs. It has significant environmental benefits as the use of fossil fuels for electricity generation is a significant source of GHG (Greenhouse Gas) emissions. The use of hybrid systems that combine renewable sources, especially wind, and Diesel generators, reduces fuel consumption and operation cost and has environmental benefits. Adding a storage element to the hybrid system increases the penetration level of the renewable sources, that is the percentage of renewable energy in the overall production, and further improves fuel savings. In a previous work, we demonstrated that CAES (Compressed Air Energy Storage) has numerous advantages for hybrid wind-diesel systems due to its low cost, high power density and reliability. The pneumatic hybridization of the Diesel engine consists to introduce the CAES through the admission valve. We have proven that we can improve the combustion efficiency and therefore the fuel consumption by optimizing Air/Fuel ratio thanks to the CAES assistance. As a continuation of these previous analyses, we studied the effect of the intake pressure and temperature and the exhaust pressure on the thermodynamic cycle of the diesel engine and determined the values of these parameters that will optimize fuel consumption.

[1]  G. Woschni.  A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine , 1967 .

[2]  Rafic Younes,et al.  Optimization of diesel engine performances for a hybrid wind–diesel system with compressed air energy storage , 2011 .

[3]  Alfred J. Cavallo,et al.  Controllable and affordable utility-scale electricity from intermittent wind resources and compressed air energy storage (CAES) , 2007 .

[4]  D. T. Hountalas,et al.  Available Strategies for Improving the Efficiency of DI Diesel Engines-A Theoretical Investigation , 2000 .

[5]  Richard Stone,et al.  Introduction to Internal Combustion Engines , 1985, Internal Combustion Engines.

[6]  Yann Chamaillard,et al.  Thermodynamic Simulation of a Hybrid Pneumatic-Combustion Engine Concept , 2002 .

[7]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[8]  Sylvain Lemofouet-Gatsi,et al.  Investigation and optimisation of hybrid electricity storage systems based on compressed air and supercapacitors , 2006 .

[9]  D. Bradshaw.  Pumped hydroelectric storage (PHS) and compressed air energy storage (CAES) , 2000, 2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134).

[10]  Yann Chamaillard,et al.  Parametric optimization of a new hybrid pneumatic-combustion engine concept , 2004 .

[11]  Bengt Johansson,et al.  Simulation of a Pneumatic Hybrid Powertrain with VVT in GT-Power and Comparison with Experimental Data , 2009 .

[12]  Lino Guzzella,et al.  Realizing a Concept for High Efficiency and Excellent Driveability: The Downsized and Supercharged Hybrid Pneumatic Engine , 2009 .

[13]  Lino Guzzella,et al.  Modelling and optimizing two- and four-stroke hybrid pneumatic engines , 2009 .

[14]  A. Ilinca,et al.  Study of a Hybrid Wind-Diesel System with Compressed Air Energy Storage , 2007, 2007 IEEE Canada Electrical Power Conference.

[15]  Andrej Ivanco,et al.  Energy Management Strategies for a Pneumatic-Hybrid Engine Based on Sliding Window Pattern Recognition , 2010 .

[16]  Chun Tai,et al.  Demonstration of Air-Power-Assist Engine Technology for Clean Combustion and Direct Energy Recovery in Heavy Duty Application , 2008 .

[17]  Victor Gheorghiu,et al.  CO2-EMISSION REDUCTION BY MEANS OF ENHANCING THE THERMAL CONVERSION EFFICIENCY OF ICE CYCLES , 2010 .

[18]  Adrian Ilinca,et al.  Energy storage systems—Characteristics and comparisons , 2008 .

[19]  Simulation of the Thermodynamic Processes in Diesel Cycle Internal Combustion Engines , 1993 .

[20]  D. Connolly.  A Review of Energy Storage Technologies: For the integration of fluctuating renewable energy , 2010 .

[21]  Bengt Johansson,et al.  Investigation of Different Valve Geometries and Valve Timing Strategies and their Effect on Regenerative Efficiency for a Pneumatic Hybrid with Variable Valve Actuation , 2008 .

[22]  Hussein Ibrahim.  Étude et conception d'un générateur hybride d'électricité de type éolien-diesel avec élément de stockage d'air comprimé , 2010 .