H2 impact on combustion kinetics, soot formation, and NOx emission of hydrocarbon fuel flames. (15th April 2023)

• Record Type: Journal Article
• Authors: Akram, M. Zuhaib; Ma, Fanhua; Aziz, Muhammad; Deng, Yangbo; Wu, Han
• Is Part Of: Fuel. Volume 338(2023)
• Publication Date: 2023-04-15
• Subjects: Hydrogen -- Gasoline surrogates -- Diesel surrogates -- PAH -- Soot -- NOx; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.127321
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: H2 impact on combustion kinetics, soot precursors and NOx in HC flames was studied. Two novel kinetic chemical mechanisms for gasoline and diesel fuels were prepared. Combustion species along with PAH and NOx species were studied under H2 impact. Soot surface & Moss-Brookes equations were used to study the soot characteristics. Premixed & diffusion flame domains were adopted as McKenna & counterflow burners. Abstract: Soot and carbon dioxide released from internal combustion engines became the key issues when using fossil fuels. The use of zero-carbon fuel, hydrogen, with hydrocarbon fuels can play an important role in reducing the exhaust effect on the environment and mitigating the reliance on nonrenewable energy resources. A numerical approach was executed to elucidate the H2 impact on combustion kinetics, soot formation, and NOx emission of hydrocarbon fuel under premixed and diffusion flame conditions. The results showed that hydrogen deteriorated the formations of particle number density, the volume fraction of soot, carbon monoxide, carbon dioxide and polycyclic aromatic hydrocarbons thru the reduction of small chain hydrocarbons at both premixed and diffusion flame conditions. The soot volume fraction and soot particle number density formation were prevailing in the air region of the combustion chamber at diffusion flame conditions. NO3 produced from fuel-related species such as CHO and air-related species such as NO. H2 reduced the peak molar fraction of small chain HC including CHO related species, resulting in a reduction in NO3 emissions. C3 H3 species dominantly participated to reduce the CO2 and NO3 emissions, while C2 H2 and C5 H4 CH2 were the main species to control the soot precursors formation in both HC fuel flames. Besides, NH3 emission was limited by C2 H2 in DS flames.