Feasibility Study of a Novel Combustion Cycle Involving Oxygen and Water

Osman, Azmi

doi:10.4271/2009-01-2808

Cited by 24 publications

(21 citation statements)

References 21 publications

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“…In recent years, oxy-fuel combustion and nitrogen-free combustion coupled with Carbon Capture and Storage (CCS) techniques have been proposed as an efficient method to achieve carbon-free emissions and improve combustion efficiency. While most of the previous and ongoing oxy-fuel combustion technologies have focused on large-scale gas turbines or coal-fired power plants, which normally have up to 30% penalty on system energy efficiency [6][7][8][9], Internal Combustion (IC) engines, as the main power producers in the transportation sector, with the utilization of oxy-fuel combustion and CCS technology is of great significance. In oxy-fuel combustion, pure oxygen is used for combustion instead of air or enriched-oxygen air.…”

Section: Introductionmentioning

confidence: 99%

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A numerical study of the effects of oxy-fuel combustion under homogeneous charge compression ignition regime

Mobasheri

Aïtouche

Peng

et al. 2021

International Journal of Engine Research

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The European Union (EU) has recently adopted new directives to reduce the level of pollutant emissions from non-road mobile machinery engines. The main scope of project RIVER for which this study is relating is to develop possible solutions to achieve nitrogen-free combustion and zero-carbon emissions in diesel engines. RIVER aims to apply oxy-fuel combustion with Carbon Capture and Storage (CCS) technology to eliminate NOx emissions and to capture and store carbon emissions. As part of this project, a computational fluid dynamic (CFD) analysis has been performed to investigate the effects of oxy-fuel combustion on combustion characteristics and engine operating conditions in a diesel engine under Homogenous Charge Compression Ignition (HCCI) mode. A reduced chemical n-heptane-n-butanol-PAH mechanism which consists of 76 species and 349 reactions has been applied for oxy-fuel HCCI combustion modeling. Different diluent strategies based on the volume fraction of oxygen and a diluent gas has been considered over a wide range of air-fuel equivalence ratios. Variation in the diluent ratio has been achieved by adding different percentages of carbon dioxide for a range from 77 to 83 vol.% in the intake charge. Results show that indicated thermal efficiency (ITE) has reduced from 32.7% to 20.9% as the CO2 concentration has increased from 77% to 83% at low engine loads while it doesn’t bring any remarkable change at high engine loads. It has also found that this technology has brought CO and PM emissions to a very ultra-low level (near zero) while NOx emissions have been completely eliminated.

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Section: Introductionmentioning

confidence: 99%

“…The oxy-fuel application in IC engines was initially proposed by Osman in 2009 [9]. In that work, a water injection system was also applied to control the in-cylinder temperature and to enhance the heat absorption during the combustion process.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of the effects of oxy-fuel combustion under homogeneous charge compression ignition regime

Mobasheri

Aïtouche

Peng

et al. 2021

International Journal of Engine Research

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“…Oxyfuel combustion based on auto-ignition of a premixed charge has been slightly studied with the lack of exhaustive experimental approaches. Simulations conducted for auto-ignition in a 2-stroke engine revealed its potential for better efficiency and emissions [22].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Performance and Emissions of HCCI Oxy-Fuel Combustion in a CFR Engine with Recirculated Carbon Dioxide

Mohammed

Elkhazraji

Jan

et al. 2020

SAE Technical Paper Series

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Stringent emission regulations and the anticipated climate change call for a paradigm shift in the design of the conventional internal combustion engines. One way to combat this problem is oxy-fuel combustion in which the combustion products are mainly water vapor and carbon dioxide. Water vapor can be easily separated by condensation and carbon dioxide is then easily captured and stored. However, many technical challenges are associated with this mode of combustion. There are many challenges facing oxy-fuel combustion before it find its way to commercial production especially for internal combustion engines. One such challenge is the relatively high temperature of the oxy-fuel combustion. A solution to this problem is the recirculation of the generated CO2 to moderate the in-cylinder temperature. Therefore, careful study of the effect of recirculating the CO2 back to combustion chamber is needed before the implementation of such a concept. This study is a continuation of a previous work published by the authors. In the previous study, the performance and emissions of an oxy-fuel HCCI engine were investigated. The in-cylinder temperature was moderated by supplying the engine with fresh CO2 from gas cylinders. In this present work the performance of the same oxy-fuel HCCI engine is investigated but the difference is that the in-cylinder temperature is regulated by recirculating the generated CO2. The experiments were conducted in a variable compression CFR engine that was modified to operate in oxy-fuel mode with recycled carbon dioxide. The emissions were also measured using an FTIR exhaust analyzer. The results showed that the implementation of this concept is possible. However, the indicated thermal efficiency deteriorates due to lower combustion and gas exchange efficiencies. Also, the CO2 recirculation resulted in higher CO and unburned hydrocarbon (UHC) emissions.

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“…There is another kind of DWI application in high efficiency ICEs field which is related to steam assistant technology (SAT) [37]. The fundamental idea of SAT is utilizing high-pressure and -temperature steam generated through waste or combustion heat absorption by direct injected water-the massive expansion work enhancement during the phase transformation of water contributes to the significant thermal efficiency improvement [38]. Szybist et al proposed a six-stroke engine conception by adding DWI into an extra stroke to recover waste heat in exhaust gases and improve fuel economy [39].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research of High-Temperature and High-Pressure Water Jet Characteristics in ICRC Engine Relevant Conditions

et al. 2019

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The internal combustion Rankine cycle (ICRC) concept provides a potential solution for future high thermal efficiency and low emission powertrains, and direct water injection (DWI) proved to be the key parameter for ICRC optimization. This paper was dedicated to investigating the fundamental mechanisms of water spray characteristics under different water injection control parameters. In order to do so, an experimental test system was carefully designed and built based on the Bosch and Schlieren methods: the Bosch method is utilized to measure the effect of injection and ambient pressure on water injection characteristics, and the Schlieren method is utilized to investigate the impact of water injection and ambient temperature on water spray and evaporation processes. The experimental results indicate that both control parameters show important effects on water injection and spray characteristics. The water injection and ambient pressure show significant impacts on steady-state flow quantity and cyclic water injection quantity, and the water injection and ambient pressure affect the evaporation ability of water vapor within the spray which leads to a different variation trend during the initial, developing, and developed water spray stages. The results of this work can be used as fundamental supplements for ICRC, steam assistant technology (SAT), and DWI-related ICEs experimental and numerical researches, and provide extra information to understand the DWI process within engine-relevant conditions.

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Feasibility Study of a Novel Combustion Cycle Involving Oxygen and Water

Cited by 24 publications

References 21 publications

A numerical study of the effects of oxy-fuel combustion under homogeneous charge compression ignition regime

A numerical study of the effects of oxy-fuel combustion under homogeneous charge compression ignition regime

A Study on the Performance and Emissions of HCCI Oxy-Fuel Combustion in a CFR Engine with Recirculated Carbon Dioxide

Experimental Research of High-Temperature and High-Pressure Water Jet Characteristics in ICRC Engine Relevant Conditions

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