Effects of port mixing and high carbon dioxide contents on power generation and emission characteristics of biogas-diesel RCCI combustion

BACKGROUNDBiogas upgrading is the process that increases the fraction of methane (CH4) in biogas, making the biogas suitable for use as vehicle fuel or as fuel with high and stable heating values for combustion engines. The advantages and disadvantages of activated carbon (AC) in CO2/CH4 adsorptive separation should be well understood before application for biogas upgrading. In the first part of this study, characteristics of CO2 adsorption and desorption on AC were investigated using Aspen Adsorption. In the second part, vacuum pressure swing adsorption (VPSA) was modeled, and the performances of the VPSA process using zeolite 13X, carbon molecular sieve (CMS) and AC were compared.RESULTSThe simulations showed that the advantages of AC for CO2 adsorption include relatively high dynamic adsorption capacity and high mass transfer coefficient of CO2 (KLDF,CO2) in AC and consequently relatively high CO2 desorption rates. However, due to the relatively high mass transfer coefficient of CH4 (KLDF,CH4) in AC, the molecular sieving characteristics for CO2 that were estimated from the ratio between KLDF,CO2 and KLDF,CH4 of AC were not significantly higher than that of zeolite 13X and significantly lower than that of CMS (9.85, 8.41 and 20.92 for AC, zeolite 13X and CMS, respectively).CONCLUSIONSThe modeling results predicted that the VPSA process using zeolite, CMS and AC adsorbents gives a biomethane product of around 98%, 97% and 93% CH4, respectively. © 2023 Society of Chemical Industry (SCI).

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“…The heavy products could be either refluxed to the bottom of the adsorption columns or used for direct and co-combustion. 46,47…”

Section: Discussionmentioning

confidence: 99%

“…The use of AC adsorbent would significantly reduce the capital costs of the VPSA process as the cost of AC is around 2–3 times lower than those of zeolite and CMS. The heavy products could be either refluxed to the bottom of the adsorption columns or used for direct and co‐combustion 46,47 …”

Section: Discussionmentioning

confidence: 99%

Characteristics of CO₂ adsorption and desorption on activated carbon in comparison with zeolite 13X and carbon molecular sieve and applications in biogas upgrading using vacuum pressure swing adsorption

Punpee

Tongpadungrod

Suttikul

et al. 2023

J of Chemical Tech & Biotech

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“…6 In a RCCI engine, the control of the combustion phasing can easily be done through the use of two fuels with different reactivity, low reactivity and high reactivity, and also with two fuels ratio. 6 Since 2011, several studies in the RCCI combustion field fueled with different fuels like Gasoline/Diesel fuel, 6,7 Ethanol/Diesel fuel, 8 NG/Diesel fuel, [9][10][11] CNG/Diesel fuel, 12 CNG/Biodiesel fuel, 13 N-butanol/Diesel fuel, 14 Isobutanol/Isobutanol with Di-Tert Butyl Peroxide addition, 15 Methanol/Diesel fuel, 16 Polyoxymethylene dimethyl ethers/Methanol, 17,18 Biogas/Diesel fuel, 19 Alochol/Diesel and biodiesel fuel, 20,21 and Renewable fuel/Diesel fuel 22 and also the use of EGR and different optimization methods were conducted. [23][24][25][26] Although, crude oil resources are limited, but in contrast, the resources of natural gas known as a cleanest hydrocarbon fuel are abundant all over the world as depicted in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Since 2011, several studies in the RCCI combustion field fueled with different fuels like Gasoline/Diesel fuel, 6,7 Ethanol/Diesel fuel, 8 NG/Diesel fuel, 9–11 CNG/Diesel fuel, 12 CNG/Biodiesel fuel, 13 N-butanol/Diesel fuel, 14 Isobutanol/Isobutanol with Di-Tert Butyl Peroxide addition, 15 Methanol/Diesel fuel, 16 Polyoxymethylene dimethyl ethers/Methanol, 17,18 Biogas/Diesel fuel, 19 Alochol/Diesel and biodiesel fuel, 20,21 and Renewable fuel/Diesel fuel 22 and also the use of EGR and different optimization methods were conducted. 23–26…”

Section: Introductionmentioning

confidence: 99%

Maximum reduction in greenhouse gas emissions by complete replacement of natural gas with pure hydrogen as a sole low reactive fuel in a RCCI engine

Sattarzadeh

Ebrahimi

Jazayeri

2022

International Journal of Engine Research

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In order to maximum reduction in hydrocarbon fuels consumption as the largest source of greenhouse gas emissions, the aim of this study is to evaluate a RCCI engine performance fueled with diesel fuel and pure hydrogen as sole low reactive fuel. For this purpose, a single-cylinder heavy-duty diesel engine with bathtub piston bowl profile and compression ratio of 14.88:1 is assessed that operates at its mid-load range from 9.4 to 13.5 bar gross IMEPs. In order to overcome the NOx challenge resulted from using pure hydrogen, the use of suitable amount of EGR and nitrogen addition as air-hydrogen diluents along with the advanced SOI timing were employed. The simulation results show that in a hydrogen-fueled RCCI engine, while reducing the diesel fuel energy share as the only supplier of air-hydrogen mixture ignition energy to about 13%, the HES percentage can be enhanced up to 87%. Although, the SOC will occur with a long delay and the CA50 will take place about 15°CA after the TDC compared to the experimental data, however, the maximum loss of the engine load is less than 6% with the GIE of more than 48% without any exposure to diesel knock. Moreover, not only the EURO VI level of the CO and UHC emissions and the EPA level of Formaldehyde emission can be met, but also, the EURO VI level of NOx emission as the most important challenge of a hydrogen-fueled engine is achievable.

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“…Because of the considerable reactivity difference between diesel and gaseous fuels (because of the higher octane number) allows superior control over the maximum pressure rise rate and peak cylinder temperature with a longer combustion duration [102]. The various low reactivity gaseous fuels, such as natural gas [103], biogas [104], and syngas [105], are used for RCCI combustion.…”

Section: Rcci: Reactivity Controlled Compression Ignitionmentioning

confidence: 99%

Study of the Potential of Electrified Powertrains with Dual-Fuel Combustion to Achieve the 2025 Emissions Targets in Heavy-Duty Applications

Boggio¹

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The transport of people, as well as cargo, has evolved and grown tremendously over the recent years. Technological development had to be adapted to the different government measures for controlling polluting emissions. Since the Paris agreement in 2015 limits have also been imposed on the CO2 emissions from road vehicles to keep global temperature growth below 1.5 o C. For the heavy transport sector, fleet limits of 15% for 2025 and 30% for 2030 CO2 reduction have been introduced with respect to the limits of 2019. Therefore, the current restriction of very low levels of polluting emissions, as well as greenhouse gases, makes the transport sector face a great technological challenge. In 2021, 99% of freight transport was powered by an internal combustion engine with Diesel as fuel and without any type of electrical assistance in the propulsion system. Moreover, polluting emission limits such as the Euro 6 are achieved with complex post-treatment systems that also add to the consumption of Urea.

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Effects of port mixing and high carbon dioxide contents on power generation and emission characteristics of biogas-diesel RCCI combustion

Cited by 23 publications

References 64 publications

Characteristics of CO₂ adsorption and desorption on activated carbon in comparison with zeolite 13X and carbon molecular sieve and applications in biogas upgrading using vacuum pressure swing adsorption

Characteristics of CO₂ adsorption and desorption on activated carbon in comparison with zeolite 13X and carbon molecular sieve and applications in biogas upgrading using vacuum pressure swing adsorption

Maximum reduction in greenhouse gas emissions by complete replacement of natural gas with pure hydrogen as a sole low reactive fuel in a RCCI engine

Study of the Potential of Electrified Powertrains with Dual-Fuel Combustion to Achieve the 2025 Emissions Targets in Heavy-Duty Applications

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Effects of port mixing and high carbon dioxide contents on power generation and emission characteristics of biogas-diesel RCCI combustion

Cited by 23 publications

References 64 publications

Characteristics of CO2 adsorption and desorption on activated carbon in comparison with zeolite 13X and carbon molecular sieve and applications in biogas upgrading using vacuum pressure swing adsorption

Characteristics of CO2 adsorption and desorption on activated carbon in comparison with zeolite 13X and carbon molecular sieve and applications in biogas upgrading using vacuum pressure swing adsorption

Maximum reduction in greenhouse gas emissions by complete replacement of natural gas with pure hydrogen as a sole low reactive fuel in a RCCI engine

Study of the Potential of Electrified Powertrains with Dual-Fuel Combustion to Achieve the 2025 Emissions Targets in Heavy-Duty Applications

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Characteristics of CO₂ adsorption and desorption on activated carbon in comparison with zeolite 13X and carbon molecular sieve and applications in biogas upgrading using vacuum pressure swing adsorption

Characteristics of CO₂ adsorption and desorption on activated carbon in comparison with zeolite 13X and carbon molecular sieve and applications in biogas upgrading using vacuum pressure swing adsorption