Study on the mechanisms of ultrafine particle formation during high-sodium coal combustion in a flat-flame burner

Fuel ◽  
2016 ◽  
Vol 181 ◽  
pp. 1257-1264 ◽  
Author(s):  
Zhenghang Xiao ◽  
Tiankun Shang ◽  
Jiankun Zhuo ◽  
Qiang Yao
Keyword(s):  
Coal Combustion ◽  
Ultrafine Particle ◽  
Particle Formation ◽  
High Sodium ◽  
Flat Flame ◽  
Flame Burner

Characterizing early stage sub-micron particle formation during pulverized coal combustion in a flat flame burner

Fuel ◽  
2019 ◽  
Vol 258 ◽  
pp. 115995 ◽  
Author(s):  
Dishant Khatri ◽  
Akshay Gopan ◽  
Zhiwei Yang ◽  
Adewale Adeosun ◽  
Richard L. Axelbaum
Keyword(s):  
Coal Combustion ◽  
Early Stage ◽  
Particle Formation ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Flat Flame ◽  
Micron Particle ◽  
Flame Burner

Effect of an Acoustic Field on the Combustion of Coal Particles in a Flat Flame Burner

1991 ◽  
Vol 113 (4) ◽  
pp. 286-293 ◽  
Author(s):  
S. Yavuzkurt ◽  
M. Y. Ha ◽  
G. Reethof ◽  
G. Koopmann ◽  
A. W. Scaroni
Keyword(s):  
Light Intensity ◽  
Acoustic Field ◽  
Coal Combustion ◽  
Flame Temperature ◽  
Acoustic Parameters ◽  
Flat Flame ◽  
Rate Of Combustion ◽  
Coal Particles ◽  
Flame Burner

The effects of an acoustic field on the enhancement of coal combustion are investigated. A flat flame burner using methane-air mixtures as the fuel is used for the experiments. Micronized coal particles 20–70 μm in diameter are injected into the burning gas stream at the same velocity as the gas. The light intensity emitted from the flame, temperature and pictures of the flame with and without an acoustic field are recorded. The nominal values of the intensity of the acoustic field are between 140–160 dB and the frequency is between 500–3500 Hz. A definite increase in the rate of combustion of the coal particles is observed with the application of an acoustic field. The enhancement can be seen from the increased light intensity of the flame and the flame width. This paper presents the data and a discussion of light intensity emitted by the flame as a function of acoustic parameters.

Mechanisms of ultrafine particle formation during coal combustion in a new swirl modification device

2018 ◽  
Vol 26 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Jun-xiang Guo ◽  
Ling-ling Zhang ◽  
Wen-bin Dai ◽  
Li-ying Qi ◽  
Ru-fei Wei ◽  
...  
Keyword(s):  
Coal Combustion ◽  
Ultrafine Particle ◽  
Particle Formation

Temperature and species measurement in a quenching boundary layer on a flat-flame burner

2010 ◽  
Vol 49 (4) ◽  
pp. 783-795 ◽  
Author(s):  
Takayuki Fuyuto ◽  
Helmut Kronemayer ◽  
Burkhard Lewerich ◽  
Jan Brübach ◽  
Taketoshi Fujikawa ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Flat Flame ◽  
Flame Burner

scholarly journals Particle formation and growth at five rural and urban sites

2010 ◽  
Vol 10 (5) ◽  
pp. 11615-11657 ◽  
Author(s):  
C.-H. Jeong ◽  
G. J. Evans ◽  
M. L. McGuire ◽  
R. Y.-W. Chang ◽  
J. P. D. Abbatt ◽  
...  
Keyword(s):  
Ultrafine Particle ◽  
Particle Formation ◽  
Nucleation And Growth ◽  
Biogenic Emissions ◽  
Traffic Density ◽  
Particle Nucleation ◽  
Size Distributions ◽  
Industrial Sources ◽  
Rural Sites ◽  
Particle Formation And Growth

Abstract. Ultrafine particle (UFP) number and size distributions were simultaneously measured at five urban and rural sites in Southern Ontario, Canada as part of the Border Air Quality and Meteorology Study (BAQS-Met 2007). Particle formation and growth events at these five sites were classified based on their strength and persistence as well as the variation in geometric mean diameter. Regional nucleation and growth events and local short-lived strong nucleation events were frequently observed at the near-border rural sites, upwind of industrial sources. Surprisingly, the particle number concentrations at one of these sites were higher than the concentrations at a downtown site in a major city, despite its high traffic density. Regional nucleation and growth events were favored at intense solar irradiance and less polluted cooler drier air. The most distinctive regional particle nucleation and growth event during the campaign was observed simultaneously at all five sites, which were up to 350 km apart. Although the ultrafine particle concentrations and size distributions generally were spatially heterogeneous across the region, a more uniform spatial distribution of UFP across the five areas was observed during this regional nucleation event. Thus, nucleation events can cover large regions, contributing to the burden of UFP in cities and potentially to the associated health impacts on urban populations. In addition, particle formation in southwestern Ontario appears to more often be related to anthropogenic gaseous emissions, although biogenic emissions may at times contribute. Local short-lived nucleation events at the near-border sites during this three-week campaign were associated with high SO2, which likely originated from US and Canadian industrial sources. These particle formation events may contribute to the production of cloud condensation nuclei, thus potentially influencing regional climate. Longer-term studies are needed to help resolve the relative contributions of anthropogenic and biogenic emissions to nucleation and growth in this region.

scholarly journals Summertime observations of elevated levels of ultrafine particles in the high Arctic marine boundary layer

2017 ◽  
Vol 17 (8) ◽  
pp. 5515-5535 ◽  
Author(s):  
Julia Burkart ◽  
Megan D. Willis ◽  
Heiko Bozem ◽  
Jennie L. Thomas ◽  
Kathy Law ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Ultrafine Particles ◽  
Marine Boundary Layer ◽  
Ultrafine Particle ◽  
High Arctic ◽  
Particle Formation ◽  
Open Ocean ◽  
Biologically Active ◽  
The Arctic ◽  
Depositional Processes

Abstract. Motivated by increasing levels of open ocean in the Arctic summer and the lack of prior altitude-resolved studies, extensive aerosol measurements were made during 11 flights of the NETCARE July 2014 airborne campaign from Resolute Bay, Nunavut. Flights included vertical profiles (60 to 3000 m above ground level) over open ocean, fast ice, and boundary layer clouds and fogs. A general conclusion, from observations of particle numbers between 5 and 20 nm in diameter (N5 − 20), is that ultrafine particle formation occurs readily in the Canadian high Arctic marine boundary layer, especially just above ocean and clouds, reaching values of a few thousand particles cm−3. By contrast, ultrafine particle concentrations are much lower in the free troposphere. Elevated levels of larger particles (for example, from 20 to 40 nm in size, N20 − 40) are sometimes associated with high N5 − 20, especially over low clouds, suggestive of aerosol growth. The number densities of particles greater than 40 nm in diameter (N >  40) are relatively depleted at the lowest altitudes, indicative of depositional processes that will lower the condensation sink and promote new particle formation. The number of cloud condensation nuclei (CCN; measured at 0.6 % supersaturation) are positively correlated with the numbers of small particles (down to roughly 30 nm), indicating that some fraction of these newly formed particles are capable of being involved in cloud activation. Given that the summertime marine Arctic is a biologically active region, it is important to better establish the links between emissions from the ocean and the formation and growth of ultrafine particles within this rapidly changing environment.

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