Nitrogen Oxides Removal and Mechanism Research for Dielectric Barrier Discharge with NaCl Solution Grounded Electrode

This review explores the efficacy of corona discharge (CD) as a non-thermal plasma (NTP) technology for the reduction of nitrogen oxides (NO x ) from combustion gases. The NTP is generated when a treated gas is subjected to a large electric field, resulting in the ionization of gas molecules without a significant thermal energy increase. NTP operates post-combustion at low temperatures, favoring NO x reduction through the generation of reactive species, such as O, O 3 , OH, and various nitrogen radicals. These species facilitate the conversion of NO to NO 2 , which can be further reduced or absorbed. The review analyses the effect of different gas compositions on the effectiveness of the CD process. Oxygen enhances NO x reduction by generating additional oxidizing species, while water vapor contributes through the formation of OH radicals and the dissolution of nitric and nitrous acids. The polarity of the applied voltage significantly impacts the ionization process and the extent of the plasma region, with negative polarity generally providing better results in terms of NO x reduction. Additionally, the use of pulsed corona discharge (PCD) shows higher energy efficiency compared to continuous direct current (DC) discharge due to optimized electron generation. The temperature influences the effectiveness of NTP, with higher temperatures potentially reducing the efficiency due to the decomposition of reactive species, like O 3 . The optimal residence time and initial NO x concentration are also crucial for maximizing reduction efficiency while maintaining energy efficiency. Overall, CD is presented as a promising DeNO x technology, particularly when optimized for gas composition, voltage polarity, and discharge nature.

show abstract

Application End Evaluation of Electrostatic Precipitation for Control PM and NOx Emissions from Small-Scale Combustions

Molchanov,

Krpec,

Horák

et al. 2024

Fire

View full text Add to dashboard Cite

Electrostatic precipitators (ESPs) have shown promise in reducing particulate matter (PM) emissions, but their potential for simultaneous NOx reduction in small-scale combustion systems remains underexplored. This study focuses on using non-thermal plasma generated in a corona discharge to reduce PM and NOx emissions from small-scale combustion. ESP was specifically designed for a commercially available 15 kW boiler with wood pellet combustion and used with both positive and negative discharge polarity to control emissions without any chemical additives. ESP performance was evaluated across a range of specific input energies (SIE) in terms of particle mass and number concentrations and NOx concentrations obtained by continuous gas analysis. ESP ensured the reduction in PM concentrations from 48 mg/m3 to the magnitude of PM content in the ambient air. The highest precipitation efficiency was observed for particles in the 20–200 nm range. Concurrently, NOx emissions were reduced by up to 78%, from 178 mg/m3 to 39 mg/m3. These results were achieved at specific input energies of 36 for positive and 48 J/L for negative corona, which is significantly lower than those reported for many existing separate PM and NOx control systems. This study demonstrates the potential of ESPs as a compact, energy-efficient solution for simultaneous PM and NOx removal in small-scale combustion systems, offering promising implications for improving air pollution control technologies for small-scale combustion systems.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Nitrogen Oxides Removal and Mechanism Research for Dielectric Barrier Discharge with NaCl Solution Grounded Electrode

Cited by 3 publications

References 43 publications

Combined control of PM and NOx emissions by corona discharge

Combined control of PM and NOx emissions by corona discharge

Outlook of Corona Discharge as DeNO_x Technology

Application End Evaluation of Electrostatic Precipitation for Control PM and NOx Emissions from Small-Scale Combustions

Contact Info

Product

Resources

About

Nitrogen Oxides Removal and Mechanism Research for Dielectric Barrier Discharge with NaCl Solution Grounded Electrode

Cited by 3 publications

References 43 publications

Combined control of PM and NOx emissions by corona discharge

Combined control of PM and NOx emissions by corona discharge

Outlook of Corona Discharge as DeNOx Technology

Application End Evaluation of Electrostatic Precipitation for Control PM and NOx Emissions from Small-Scale Combustions

Contact Info

Product

Resources

About

Outlook of Corona Discharge as DeNO_x Technology