Abatement of NOX using compact high voltage pulse power supply: Towards retrofitting to automobile vehicle

Mohapatro, Sankarsan; Sharma, Nikhil Kumar; Madhukar, Apeksha

doi:10.1109/tdei.2017.006052

Cited by 9 publications

(7 citation statements)

References 23 publications

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“…The CO emissions were reduced, while the NO x emissions were increased due to complete burning. Mohapatro et al (2017) investigated the effects of high voltage pulses by using compact power supply sources on the NO x emissions of diesel engines [30]. The result showed that while the flow rate was maintained at 2 L/min, the maximum efficiency of the cylindrical electrode was 86%.…”

Section: Non-thermal Plasmamentioning

confidence: 99%

Effect of Water Vapor Injection on the Performance and Emissions Characteristics of a Spark-Ignition Engine

et al. 2021

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The exhaust emissions from Internal Combustion Engines (ICE) are currently one of the main sources of air pollution. This research presented a method for improving the exhaust gases and the performance of a Spark-Ignition (SI) engine using a water vapor injection system and a Non-Thermal Plasma (NTP) system. These two systems were installed on the intake manifold to investigate their effects on the engine’s performance and the characteristics of exhaust emission using different air/fuel (A/F) ratios and engine speeds. The temperatures of the injected water were adjusted to 5 and 25 °C, using a thermoelectric cooler (TEC) temperature control device. The total hydrocarbons (HC), nitrogen oxide (NOx), and engine torque were measured at different A/F ratios and engine speeds. The results indicated that the adaptation of the water vapor injection system and NTP system increased the content of the combustibles and combustion-supporting substances while achieving better emissions and torque. According to the test results, while the engine torque under 25 °C water+NTP was raised to 7.29%, the HC under 25 °C water+NTP and the NOx under 25 °C water were reduced to 16.31% and 11.88%, respectively. In conclusion, the water vapor injection and the NTP systems installed on the intake manifold could significantly reduce air pollution and improve engine performance for a more sustainable environment.

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Section: Non-thermal Plasmamentioning

confidence: 99%

Effect of Water Vapor Injection on the Performance and Emissions Characteristics of a Spark-Ignition Engine

et al. 2021

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“…The preceding works on NOx−HC−PM reduction using NTP mostly investigated using simulated gas, 5,24,34−36 filtered diesel exhaust gas, 4,[7][8][9]37 or diluted diesel exhaust gas. 15,17,26,29 Few studies have investigated the simultaneous effect of HVD on both gaseous and PM emissions from raw diesel exhaust gas that contains PM and water vapor and can affect the formation of free radicals.…”

Section: ■ Introductionmentioning

confidence: 99%

“…HVD has been investigated and proved to improve diesel exhaust emissions for gaseous (e.g., NOx, − CO, and THCs) and PM emissions. − Fundamentally, HVD operates using a high potential applied to electrodes between which exhaust gas can flow. Exhaust gas molecules are ionized when present near electrodes and release visible light emission, which is referred to as plasma or known as the fourth state of matter .…”

Section: Introductionmentioning

confidence: 99%

“…Exhaust gas molecules are ionized when present near electrodes and release visible light emission, which is referred to as plasma or known as the fourth state of matter . In HVD, a nonthermal plasma (NTP) is produced, which occurs when the kinetic energy (or temperature) of electrons is significantly higher than the kinetic energy of gaseous molecules (in this case, exhaust gas). , Electrical energy is transferred to electrons in the NTP system, which leads to the formation of free radical species such as N, O, HO 2 , and OH. Subsequently, O 3 , NO 2 , NO 3 , HNO 3 , and several intermediate species ,,, are formed, as shown in reactions – in the Appendix.…”

Section: Introductionmentioning

confidence: 99%

“…The preceding works on NOx–HC–PM reduction using NTP mostly investigated using simulated gas, ,,− filtered diesel exhaust gas, ,− , or diluted diesel exhaust gas. ,,, Few studies have investigated the simultaneous effect of HVD on both gaseous and PM emissions from raw diesel exhaust gas that contains PM and water vapor and can affect the formation of free radicals. Recent studies − only focused on the aspect of either PM oxidation or DPF regeneration by O 3 generated by NTP, while there are limited works in the literature on the aspect of the synergy effects of direct NTP and ESP.…”

Section: Introductionmentioning

confidence: 99%

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Impact of High-Voltage Discharge After-Treatment Technology on Diesel Engine Particulate Matter Composition and Gaseous Emissions

et al. 2021

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Diesel particulate matter (DPM) and oxides of nitrogen (NOx) are the emissions from diesel engines (compression ignition engines) of the most concern and are currently strictly regulated. In this work, we present an alternative diesel emission control technique to assist in further emission reduction. An experiment-oriented study on diesel engine emission abatement using low-power, low-frequency, high-voltage discharge (HVD) treatment was carried out in a laboratory-scale reactor with whole diesel engine exhaust gas. A dielectric barrier discharge (DBD) reactor was used in direct contact with diesel exhaust gas at atmospheric temperature with an input energy density between 200 and 400 J/L. An investigation of the direct effect of the high-voltage discharge reactor on the diesel exhaust gas treatment was carried out to characterize both diesel particle and gaseous emissions. The proposed HVD system demonstrated up to 95% particulate matter reduction by mass or 64% reduction by number, and 63% reduction of the diesel soot particle geometrical mean diameter by HVD-generated O3 oxidation. Thermogravimetric analysis revealed the significant change in the diesel soot compositions and oxidation characteristics. HVD-treated particulate matter demonstrated a lower reactivity in comparison to untreated soot. Gas composition analysis indicated the generation of free radicals (e, O, OH, O3, and N) by the HVD system, as mainly indicated by the increase of the NO2/NO ratio and concentration of CO and O2. The pattern of CO2 reduction while CO and O2 increased indicated the dissociation of CO2 by HVD. Free radicals generated by HVD directly affected DeNO, DeNOx, NO2/NO ratio, and CO and CO2 selectivities.

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The Influence of Direct Non-Thermal Plasma Treatment on Soot Characteristics under Low Exhaust Gas Temperature

Iamcheerangkoon,

Chollacoop,

Sawatmongkhon

et al. 2023

E3S Web Conf.

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This study aimed to assess the effectiveness of nonthermal plasma (NTP) technology utilizing a dielectric barrier discharge (DBD) reactor, both with and without exhaust gas recirculation (EGR), in reducing soot particles and their impact on nitrogen oxides (NOx). The experiment involved maintaining a constant flue gas flow rate of 10 l/min, employing high voltage values of 0, 6, and 10 kV, fixed frequency of 500 Hz and setting the various IMEP of 5, 6, and 7 bar and the engine speed at 2,000 rpm. The findings demonstrated that NTP was successful in removing NOx by approximately 16.84% and 17.01%, achieving particle matter (PM) removal efficiencies of around 60.79% and 81.13%, and effectively reducing activation energy by approximately 18.34% and 31.5% (with and without EGR, respectively) at a high voltage of 10 kV. These results highlight the potential of NTP technology in mitigating emissions and reducing the environmental impact associated with diesel engines.

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Abatement of NOX using compact high voltage pulse power supply: Towards retrofitting to automobile vehicle

Cited by 9 publications

References 23 publications

Effect of Water Vapor Injection on the Performance and Emissions Characteristics of a Spark-Ignition Engine

Effect of Water Vapor Injection on the Performance and Emissions Characteristics of a Spark-Ignition Engine

Impact of High-Voltage Discharge After-Treatment Technology on Diesel Engine Particulate Matter Composition and Gaseous Emissions

The Influence of Direct Non-Thermal Plasma Treatment on Soot Characteristics under Low Exhaust Gas Temperature

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